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ramanPi - Raman Spectrometer

The open source 3D Printable Raman Spectrometer using a RaspberryPi and easy to find off the shelf components..

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The ORIGINAL open source 3D Printable Raman Spectrometer that uses a raspberryPi, a really bright laser and some parts you can grab from your favorite suppliers..!

BASIC DESIGN GOALS:
1. Make it Open.. Everything.. All of it..
2. Make it 3D Printable.
3. Make it modular and easy to upgrade.
4. Make it as easy to build as possible.
5. Make it easy to customize and open to improvement.
6. Use only commonly available off the shelf components whenever possible.
7. Have a remote interface that will allow it to be controlled and viewed from anywhere.
8. Compare the spectra to the online internet spectral databases.
9. Provide the capability to log data to remote databases, share with friends and colleagues..
10. Not be just another open source spectrometer..
11. Make it easy to use and intuitive.
12. Make it attractive with an elegant design..
13. Make it useful and just cool to have!

Welcome to the hackaday.io project page for the ramanPi! The ramanPi is a raman spectrometer that I decided to build back in April of 2014 because I needed one for another project and could not afford the tens of thousands of dollars a commercial product costs...and there are no DIY or open source systems in existence until now. I knew nothing about spectroscopy, let alone raman spectroscopy back then and everything here documents my learning process towards my goal.....A fully functional, and fairly high resolution raman spectrometer. When I started this project, I had wildly different ideas about how I was going to achieve my goal. The project logs begin very early in my design process and document how I changed my approach and what led to the form it is taking now. In the process of designing this system, and participating in TheHackadayPrize, I have learned a great deal.. Not just about spectroscopy and how raman systems work, but about how important it is to share your work with others..to contribute to the community and help others learn as well. Before I started this project, I had no idea I would later join the contest. I had started to post my project once...then deleted it because I didn't think anyone would be interested. I decided to post it after speaking to a friend who convinced me to go through with it. It wasn't long until Mike S. here at hackaday contacted me to do a Hacker Bio...apparently the first of it's kind on hackaday..! Of course I was interested and very grateful...Mike encouraged me to go further and really convinced me that this is important and sharing benefits everyone.. Boy did I learn how true that is.. In the journey so far, I have learned a tremendous amount, people have been wonderfully supportive and have offered some terrific advice! I want to thank everyone for everything! This is my first project that I've shared publicly, and I have not looked back..It's been one of the greatest experiences I've had the honor of to date.. I am determined to finish this project and make it the best it can be, because everyone has been so supportive and the interest it has generated has made me want to make it better..! Thank you to everyone who has been so great.!!

Be sure to check out the bio that Hackaday.com did on me!!

ST Micro gave me a shoutout on their Facebook page!

The great people over at RaspberryPi.org did a wonderful article on ramanPi!

Some kind words from the folks at 3ders.org too!

Thanks to Elecia and Chris White at embedded.fm for the great podcast interview!

Follow me on twitter too! I'll be tweeting on gitHub updates as well as from here!

Index of Instructions and Informational project logs:

THP Semifinals Video

You can also view the project log with this video that includes a full transcript HERE ...

THP Finals Video

A bench top, raman spectrometer constructed from very easy to source components and 3D parts printable on even entry level printers. My system is a completely unique innovative design in the world of raman spectroscopy and has many advantages beyond the fact it can be constructed for a tiny fraction of the cost of a used commercial system, which can cost tens of thousands of dollars! My system connects to multiple internet databases to retrieve spectral data to identify chemical compounds under test. It is completely scalable to fit almost any budget... Many of the components can be used for other purposes outside...

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  • 1 × Raspberry Pi Model B+ 512MB RAM $39.95ea Adafruit Product ID: 1914
  • 1 × ARM Nucleo Board STM32F4 STM32F401RE 512K $10.33ea Mouser Part Numer:511-NUCLEO-F401RE
  • 1 × Tosbia TCD1304DG Linear CCD Array Detector $14.99ea eBay
  • 3 × Black Plastic 3D Printer Filament Cartridge (I used an XYZ daVinci v1.0 - 1.75mm 600grams per cartridge) $28.00ea Amazon
  • 1 × Set of ramanPi PCB Kit (3x prototype boards, some solder and a long weekend) $TBD - Probably around $20ea
  • 1 × 532nm 150mw Green Laser Module with Thermoelectric Cooling and TTL Modulated $89.99ea eBay
  • 1 × Edmund Optics 1200 Grooves/mm, 25mm Square, VIS Holographic Grating Stock No. #43-216 $135.00ea Edmund Optics
  • 1 × Edmund Optics 20mm Dia x 80mm Focal Length, Spherical Mirror Stock No. #46-239 $37.50ea Edmund Optics
  • 1 × Edmund Optics 50mm Dia. x 100mm FL Protected Aluminum, Concave Mirror Stock No. #43-471 $42.50ea Edmund Optics
  • 1 × Edmund Optics 10μm x 3mm, Mounted, Precision Air Slit Stock No. #58-540 (OR EQUIVALENT) $115.00ea Edmund Optics

View all 77 components

  • moar of the things

    fl@C@03/10/2017 at 08:08 0 comments

    So, I thought I'd throw a couple of these in for inspiration.... I'm really enjoying Fusion360... Anyone interested in helping with creating these?

    This is the beamSplitterAssembly reborn into a simpler, and easier to print design.. No more of that tiny little carriage for the cube, this one is much more robust and a way simpler design..


  • And...I'm feeling productive..

    fl@C@03/09/2017 at 07:53 0 comments

    And, so the beginnings of the new beam splitter assembly... I'm enjoying fusion 360 so far.. Took me a minute to get the hang of it, but I'm progressing...

    So, again...comments, questions are all welcome!

  • First new part - a new objectiveLensMount!

    fl@C@03/09/2017 at 04:44 0 comments

    Well, here it is...! A new start and a new part... I'll be adding these parts to the gitLab Repo as I finish them.. If you'd like to contribute to the creation, let me know through a DM here! The collaborative features of fusion 360 should make it pretty easy.. As always, questions or comments are welcome!

  • Moving On...

    fl@C@03/08/2017 at 23:23 0 comments

    Ok, the gitlab repository has started ( https://gitlab.com/ramanPi ).. I'm basically giving up on the website for ramanPi.org... I don't have the time to try to keep it from the constant bot attacks or whatever...

    So, this brings me to the next point... I'm going to be starting an updated version of ramanPi in the new gitlab repo. I am interested in everyone's opinion on this, so if you have any.....let me know here...asap!

    The new design will be created in Autodesk Fusion 360. The releases will be housed in the gitlab repo, and collaboration will be through fusion360.. If you'd like to get in on it from the start, now is the time! I have a TON of people who've wanted to join the dev team through this website... I'm going to approve them all... If you are still interested, let me know through a DM here, same goes if you're not interested anymore..

    Optics will be fairly similar, electronics are going to be majorly different (and I am going to take my time this time, not being rushed with a contest)... and hopefully, the whole thing benefits from better design software, more expertise, more experience, more care and time taken, etc...etc..

    Let's get going, finally... I've had a few failed starts...but my plate is clear now...Proof is in the pudding.. =D

  • gitHub vs. gitLab and other exciting news.

    fl@C@10/12/2016 at 01:01 0 comments

    I'm thinking about moving the repo from gitHub...and over to gitLab.. GitLab seems to be a lot better suited to what I'm trying to accomplish.. I'll probably keep gitHub there, and maybe update it with major updates or at certain intervals...but it won't be the repository that gets the regular pushes, etc.. Any questions or comments about that are welcome!

    Also......I am directing some efforts towards a redesign of the electronics in ramanPi... Meaning the four boards (interface, control, imaging, and power boards) will narrowed down to a single board....and that board will have a connector for a raspberryPi zero to sit on... I haven't gone through the specifics of how the zero will connect completely since there's the business with the USB, etc. to deal with in order to get wifi/networking....but the significant cost savings warrants a close look...this redesign is an effort to cut costs and complexity...so.....hopefully that's exciting news..

    ramanPi.org is on it's way back to life, thanks to some help from a generous web developer! Looks like the bot attacks are no longer an issue...now it's just back to business..!

  • MagPi Issue 50 - ramanPi is #7 !

    fl@C@09/30/2016 at 11:13 0 comments

    So, to my amazement...ramanPi is reaching more and more people... this time it looks like the great people over at Raspberry Pi's MagPi magazine included ramanPi in it's "Top 20 RaspberryPi Projects" and the "MagPi Issue 50 - Top 50 Raspberry Projects".. And a while ago they wrote a great bit on ramanPi in their blog..!

    Thanks to them, and everyone for everything..!

  • Update.

    fl@C@05/08/2016 at 17:42 6 comments

    So.. I figured I'd consolidate the last few logs into this one to make it easier to follow what's going on...

    Hackers.. I moved ramanPi.org over to a new host...and it's helped with reliability... But it hasn't stopped the 1,004 malicious login attempts and constant bot traffic trying to overwhelm the site.. I don't have the resources, time or whatever to spend on mitigating the constant attacks...

    Soo..... Basically, as a result.. I can't seem to recover anyone's email addresses, etc. If you were interested in developing, or were participating... Contact me here, I know a lot of people have..and I'm trying to keep up.. I'll get to you soon! But I'm thinking of just forming the 'team' here at hackaday.io to make life easier. It's not as organized, and a little restrictive...but it's here.

    So, hopefully some of you see this..and so on... Here's to picking up where we left off... :D I'll try to update here with what I can..

  • ramanPi and 3D Printing for the Citizen Scientist @localMotors

    fl@C@05/08/2015 at 15:26 0 comments

    Hey, short notice... But if you're going to be in the Phoenix area the week of the 14th, I will be in town at Local Motors to talk about ramanPi and 3D Printing for the Citizen Scientist..!

    Hopefully I can put up a video of the talk after if you missed out and are still interested!

    PM me if you're interested in more details!

  • Developer Developments

    fl@C@04/28/2015 at 23:04 0 comments

    So, it's been a great past couple weeks! I have had some really talented and incredibly smart people contact me and offer their help to contribute to ramanPi..!! I'm very excited about where this is going and I think by the end of it, we will have a very good system.

    We have a couple Python gurus, one of which has both PyQt4 and signal processing experience as well as being an electrical engineer with FPGA skills. Another being skilled with the various libraries we'll be using in addition to a multitude of programming languages and has a Masters in Physics. There's a couple people who have some in depth knowledge and experience with optics and lasers as well as raman systems, both in usage and design.. Another who is very skilled with FPGA design and will make the difference for the imagingBoard.. All of these people are being very gracious in offering their time, experience, knowledge and skills to work together to bring ramanPi to the next level and make it a system that can be used for serious science in the school, in the lab or at home!

    I'd really like to take a moment and thank everyone for all of this.. It's going to be very exciting!

    If you're interested in contributing as well, you can contact me at dev@ramanPi.org!

  • Updates

    fl@C@04/07/2015 at 02:54 0 comments

    So... I've been a little short on updating...there's a lot going on.. But I wan't to say that I'm still looking for some python developers, FPGA, even openSCAD... Below is a preliminary (incomplete) list of where the development is going...

    If you'd like to be a developer, email us at dev at ramanpi dot org....and we'll set you up with a developer forum ID, etc.. or you can sign up yourself at dev.ramanPi.org and we'll get you started..

    You can find this list, which will be update as often as possible here.. If you think you can contribute to any of these areas let us know!!

    3D Printable:

    • Spectrometer (just the spectrometer, separate from the raman system)
      • Geometry and "self assembly"
    • Beam Splitter Assembly
      • Newer Optics to conform with kit specs ( meaning no eBay )
    • Mirror Mount Assembly
      • Newer Optics to conform with kit specs ( meaning no eBay )
    • Objective Lens Assembly
      • Newer Optics to conform with kit specs ( meaning no eBay )
    • Laser Shutter Assembly
      • Completion of shutter assembly
        • servo needs more solid mount
        • rotator needs to be longer and will divert beam to indicator
    • Filter Selector Assembly
      • Newer Optics to conform with kit specs ( meaning no eBay )
    • Beam Dump
      • Possibly add sensor to measure laser color and power
    • Cuvette Tray Assembly
      • Rework gearing and slide mechanism
      • Include the cuvette peltier

    Electronics:

    • Spectrometer (just the spectrometer, separate from the raman system)
      • Total circuit redesign using an FPGA
      • Ocean Optics USB4000 compatibility
        • protocol compatibility
        • pin configuration compatibility
      • Possibly integrate FPGA circuit on same board as CCD (or 90deg mount)
      • Client software will accept input from spectrometer outside the system via usb
    • controlBoard, interfaceBoard and raspberryPi integrated onto single board using the raspberryPi compute module.
      • This will eliminate the stm32 development boards.. and reduce the PCB manufacturing costs significantly
    • Outer case
      • Elimination of the PC computer case and create a specialized box for the ramanPi specifically.

    Software:

    • Client Software
      • Develop new client software based on a use case study
    • raspberryPi backend software
      • Complete server end software that controls the system and retrieves and processes the data transmitted to the clients.

    Firmware:

    • Spectrometer (imagingBoard)
      • Develop firmware to establish full Ocean Optics USB4000 compatibility.
    • controlBoard (will now be controlSection)
      • Shouldn't need to be much change in direction, just completion of portions for PID control of cuvette and imaging peltier, etc..
    • interfaceBoard (will now be interfaceSection)
      • Also should not need to be much change in direction, just compltion of menuing system and touch panel interfaces, etc..

View all 87 project logs

  • 1

    Below is a list of build instruction logs that will instruct you on how to go all the way from sourcing your components to printing the parts, and constructing your very own raman spectrometer!

    To begin, you will need some tools..  Pretty much every section requires similar tools.  If a section requires a special tool not listed here, it will state that and show you which tool is appropriate.

    Tools Required:

    • 1. Needle Nosed Pliers
    • 2. 1.5mm Hex Driver
    • 3. 5/16 Hex Driver
    • 4. Philips Screw Driver
    • 5. Precision Tweezers
    • 6. Nitrile Gloves
    • 7. Cotton Gloves
    • 8. KimTech KimWipes

    3D Printed Part Guidelines:

    Printing the 3D Printable parts will take you probably about a week. The spectrometer portion alone took about 15 hours on my XYZ daVinci 1.0 printer.. The 5.25" Drive tray takes about 10, and most of the other parts are about 6 or 8 hours.. Print in high enough quality to make sure the parts end up solid enough that they won't crumble in your hands..use 30-50% density... Supports are a good idea and the spectrometer really should be printed with the inside facing the floor. I managed well with .2mm height, you might want to try .1 or whichever is best for your printer. All the parts have been designed for use with ABS plastic and I would recommend using black ABS filament.  For parts with beam paths, I am investigating different ways to coat the interior for reduction in reflections, etc. For now, if you like you can coat them with a flat black paint..this will help keep the noise floor down.

    All of the 3D Printable objects are located in the gitHub repository.  They have been created with openSCAD and can be modified, etc.  You can view the .STL files and you can download and edit / modify the .SCAD files as well.  

    Sections You Will Be Building and Configuring:

    Following Instructions:

    Each section of the raman spectrometer system is divided into separate build logs to make it easier to find a section and keep the flow.  You'll see each section has a "LET'S BUILD IT" graphic..

    You can click on that and it will take you to the appropriate instructional build log associated with that section!  At the end of the instructional build log, there will be a link to return here...or you can just close the tab and this tab should be here waiting!

  • 2

    Section: 1

    A Completed objectiveLens Mount

    Components Required:

    Click on the graphic above to open a new tab with instructions on how to build your objectiveLens Mount!

  • 3

    Section: 2

    A completed beamSplitter Assembly

    Components Required:

    Click on the graphic above to open a new tab with instructions on how to build your beamSplitter Assembly!

View all 13 instructions

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Discussions

leelsuc wrote 01/24/2015 at 20:51 point

Hey Fl@c@. THANK YOU SO MUCH for doing this great work.

one question, could you post the books or notes to calculate the czerny turner spectrometer? I 've been looking for a long time... thanks, or any online source or formula you can share with us?

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FrankenPC wrote 01/11/2015 at 00:05 point

Hey Fl@c@. THANK YOU SO MUCH for doing this complete build log. This is genius.

So, I WANT to build one really bad. I'm in need of this kind of technology right now and I have the money for the parts. I don't currently have a 3D printer though.

SO a couple of questions for you! There are 3D printer on demand sites on the web I'm sure. Do you recommend any? Never hunted for a service before. And you mention the PCB kits. You have any plans to sell them in the near future or should I just outsource some vendor who does Eagle? Can you recommend any prototype manufacturers?

Finally, your Eagle files are up to date? No dead bug mistakes or anything?

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fl@C@ wrote 01/11/2015 at 10:06 point

Hey FrankenPC.... So, thank you..! I am in the process of gearing up to offer kits.. I am planning on offering full kits, or parts.. I am also looking into offering either plastic parts (will probably be molded, or possible HDPE machined, etc..) and also aluminum parts.. The PCBs are current, but I will be updating them in the near future with more options... and I will be offering those as well. If you need something very soon, I've used OSHPark but they seem pricey to me..but the boards come out very nice. I don't know of any 3D Printer on demand sites...but I have seen a couple in shopping malls lately.. If you're not in a terrible rush, I am working very hard to get the site up and things in line to offer them... =)

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jgm.requel wrote 01/20/2015 at 19:43 point

Well you can count me as a purchaser when you do!
-James

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eichlerdr wrote 12/27/2014 at 01:53 point

I am a chemistry student at UIC and I have been working on some independent studies with spectroscopy, and I must say this is absolutely amazing. I was thinking of doing a basic visible light spectroscopy device with the raspberry pie, but now that I have seen this I may have found a new project to play around with. Please keep up the innovation!

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fl@C@ wrote 01/07/2015 at 07:36 point

Hi eichlerdr, thank you..! Maybe start out with just the spectrometer portion! Keep my updated on your build!

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bootdsc wrote 12/09/2014 at 20:58 point
This is the single most complicated and impressive build to ever cross HaD, how it ended up in 5th place is some kind of conspiracy. Beat out by a handheld spectrum analyzer, really? Come on i can go on amazon and buy one so who cares. I hope you bring this to kickstarter and have lots of success.

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fl@C@ wrote 01/07/2015 at 07:34 point

Hi bootdsc..! Hey, thank you.. I am just glad to have been a part of the whole thing, there were a lot of great projects.. I hope I can get to that point soon!

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admin wrote 11/30/2014 at 05:05 point
I would just like to congratulate you with regards to your project, i have no previous knowledge of Raman or much else, but you have sparked my interest and i have been studying like no tomorrow, i have started to order parts and i am going to build it.
i will have of course lots of questions and hope you don't mind me asking (don't want to be a pain)
again congrats
David

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fl@C@ wrote 12/04/2014 at 04:11 point
I'm always open for discussion! Thanks for the interest and I wish you the best of luck..! Keep an eye out, I will be doing some possible design updates in the next few weeks.. I will do my best to keep the component list the same though :)

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gabriel.goetten wrote 11/27/2014 at 13:28 point
Hey man! Your project is freaking amazing! However, the signal seems too weak right? Maybe it is because the intensity of the laser... Anyway, are you planning to sell this as a full ramanpi where we can buy it fully? Because it seems very good =D

  Are you sure? yes | no

fl@C@ wrote 12/04/2014 at 04:09 point
Thanks.. If the signal you're referring to is indicated in the posting titled 'Raman' ... I should probably have spent more time on that post.. It's probably misleading in that I think it indicates my attempt of obtaining a raman signal over testing the RTOS implementation of the imagingBoard firmware.. Where I say that the raman signal is incredibly weak is reference to the fact that raman signals are incredibly weak in contrast to the rayleigh light in return... I was sleep deprived and generally worn down by the contest deadlines...... A week or two more and I will be back on track and clearing up my intentions with this device....which will in fact probably include a kit and possibly pre-built version for sale.. I have had a lot of inquiries regarding that, so here is hoping!
Thanks again.. I'd like to hear your opinion or anyone else's if you/they have any requests for functions or features...!

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Neil Jansen wrote 11/13/2014 at 22:09 point
This just once again proves the judges weren't doing their jobs. Very sorry you didn't win first place, and I'm sorry that they thought a sensor breakout board and some pcv pipe antennas were cooler than your project. You deserved to win, your work and dedication towards this project has been amazing.

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Christian Lerche wrote 11/15/2014 at 08:18 point
I disagree with you on that point Neil, the judges did what they were asked to do. You and I as well, have different opinions on who should win the prize, but you can't say the judges didn't do their jobs.

  Are you sure? yes | no

fl@C@ wrote 12/04/2014 at 04:14 point
Thanks for the kind words Neil..! I'm just happy that I was a part of the whole thing.. I never even expected to make the final 5.. I totally thought you'd beat me there..! I'm very sorry btw...I love your project and will definitely be building/buying one..!

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airbuckles wrote 11/12/2014 at 17:56 point
THIS IS AWESOME!!!

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matt wrote 11/11/2014 at 06:23 point
So far how much success have you had in identifying compounds using this instrument? I understand that you are still working on the software. Can you post some example spectra with a database spectra to show how your results compare?

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fl@C@ wrote 12/04/2014 at 04:12 point
I'll be re-writing the firmware for the imagingBoard in the next few weeks.. expect lots of updates from that..!

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Dmitri wrote 10/29/2014 at 11:15 point
Love this project!
A couple questions:
1. Why did you decide to go with crossed Czerny-Turner configuration? Aberration corrected concave holographic gratings clearly offer some advantages. Was the price point too prohibitive?
2. Why not do away with just one edge filter? You probably don't care about anti-Stokes scattering. Removing 522nm Short Pass Filter would simplify the design.

  Are you sure? yes | no

fl@C@ wrote 10/29/2014 at 21:19 point
Hi, thanks Dmitri...
Yes, number one is about cost.. The concave holographic grating was considerably more expensive.. It might be something I consider later though..
I actually do want information on the anti-stokes as much as stokes in my other project.. The beauty is that if people aren't interested in the cost or complexity, an adapter can be made to replace the filter selector assembly..!

  Are you sure? yes | no

vazquez wrote 03/08/2016 at 01:11 point

The filters are not symmetrical around 532. The short WL filter cuts up to 360 cm-1 from the laser line, this is good. The Stokes filter, otoh, cuts up to 615 cm-1, this limits the "good" side (most intense) of the scattering to higher vibrational frequencies only. Did you consider using a second gratting instead of filters to remove the laser exciting line?

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Jrsphoto wrote 10/29/2014 at 05:00 point
Congrats fl@C@ Glad to see you made it to the final 5!

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fl@C@ wrote 10/29/2014 at 21:20 point
Thanks!! I'm still looking at those libraries when I get around to the version for the raspi camera!

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radiusmike wrote 10/25/2014 at 04:10 point
Superb. This is most impressive. You have my vote for Best in Class and the Hackaday Prize. Wow!

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fl@C@ wrote 10/29/2014 at 21:21 point
Thank you..! I'm happy people like it!

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carrigan90 wrote 10/18/2014 at 20:37 point
Awesome!

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fl@C@ wrote 10/29/2014 at 21:22 point
Thanks!

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WestInSide wrote 10/15/2014 at 08:15 point
Nice!!!! Congrats!

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fl@C@ wrote 10/15/2014 at 19:47 point
Thank you!

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spacedoudou wrote 10/14/2014 at 12:08 point
you're in the top 5 !!! congrats !!

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fl@C@ wrote 10/15/2014 at 19:46 point
Hey thanks spacedoudou! =D Lots to do now..!

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David wrote 10/13/2014 at 18:15 point
Well Done!

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fl@C@ wrote 10/13/2014 at 19:59 point
Thank you! =D
I look forward to seeing your PCR machine...! I would like to build one myself... Hopefully I can see it in Munich!

  Are you sure? yes | no

David wrote 10/14/2014 at 12:22 point
Sure, no worries. If I get some PCB's made up by then, you can have one :)

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Kojote wrote 10/15/2014 at 09:22 point
Make Munich too?

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fl@C@ wrote 10/15/2014 at 19:44 point
Thanks David! :)
I want to get a group of instruments like yours, the pyppm and mine and whatever else can be found together to make a nice suite of lab gear.. maybe share a protocol and be able to integrate data.. An openLab suite so to speak..

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fl@C@ wrote 10/13/2014 at 20:00 point
Thank you!

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PointyOintment wrote 10/09/2014 at 10:50 point
I remember you wrote recently (in one of the log entries?) about automatically moving the CCD for the purpose of superresolution. I can't find it again, but you might find this interesting: http://wayback.archive.org/web/20131002130348/http://www.cs.columbia.edu/CAVE/projects/jitter_camera/

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fl@C@ wrote 10/09/2014 at 17:35 point
Yes, I did... I mention it in the project details for the imagingBoard and here - http://hackaday.io/project/1279/log/8927-spectrometer-physical-design-concept ... I think I mentioned it in the last video as well.. You've got a good memory!
Thanks for that link, it looks like it's got some good info.. I don't know why, but this part kind of fascinates me too.. I'd like to work on something that uses this for regular photograps as well..The idea of eeking details this way is pretty cool.. I haven't spent a lot of time on figuring out how I'm going to slide the detector on the spectrometer since I've been mostly focused on just getting it to work first... :) But it's definitely something I want to visit when I can..Thanks again!

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WestInSide wrote 10/08/2014 at 13:31 point
Is the beam spiltter S or P polarized and would it be better to take a different reflection/transmission tatio e.g. 25/75?

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fl@C@ wrote 10/08/2014 at 16:26 point
I designed the beam splitter module to have quick access to the beam splitter itself.. In case you want to swap them out, etc.. The build instructions show this in detail.. http://hackaday.io/project/1279/log/9966 You can insert whichever 12.5mm cube beam splitter you need...the .scad file is available as well in case you require more flexibility..

As for which is better.... This site shows some insight on the effects of polarization in raman spectroscopy... http://www.analyticalspectroscopy.net/ap4-7.htm There's also some good answers here http://www.researchgate.net/post/What_is_the_role_of_polarized_light_and_unpolarized_light_in_Raman_spectroscopy

The particular splitter I started off with in my version is from eBay (new ones are expensive, especially if you want laser-line polarizing).. listed as non-polarized dpss 532nm (I have to assume it's 50/50)..I'll probably end up buying a new one in the long term for my purposes.. To be honest, I've only been working on this project since June, I haven't had much time to consider the benefits of different ratios.. It's an interesting idea..

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WestInSide wrote 10/10/2014 at 13:09 point
There are some PDF's on the page, which are quite informative. It seems that a
90/10 splitter increases the raman signal up to 4 times.
http://www.ondax.com/noiseblock-9010-beamsplitter-filters

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fl@C@ wrote 10/10/2014 at 14:51 point
So, it looks like that replaces the splitter, and works in conjunction with their "sureblock" notch filter(s).. Almost like a mix of interference filter, beam splitter, diffraction grating and notch filter... Has a weird geometry too.. Wouldn't work in this system due to space constraints, etc..
Looks like a pretty cool product.... But I'm very afraid to ask how much those cost..or where to buy them..

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Neo wrote 10/05/2014 at 22:50 point
Hi fl@C@,

I was a research intern in one of the premier R&D(CSIR-CEERI) institute in India. Now i am carrying out independent research. During my internship(~4 years), i have not learned much about optical systems and architectures involved in it, but learned much about spectroscopy in general. I contributed to the development of AOTF based NIR spectrophotometer - mostly working in analog signal conditioning, microcontroller interfacing, data acquisition in PC(gpl licensed)(https://github.com/lrmodesgh/Spectroserver), analyzing... etc. Coming from a farming and food based family background i was kind of attached to the project from then.

I was following your project for a long time, and really proud about guys like u to adapt peer production and free systems model to develop the project transparently. In the midst of proprietary (scio) and infectious incorporations (tellspec) projects like your ramanPi, spectruino, publiclab DIY spectrometer were very transparent and filled with freedom ambience.

Upon realizing from my first day about the positive impact that a spectrometer can create in ecology and society, i was very much interested to do one by myself. Unavailability of 3d printing or other similar production unit made it unimplementatble for me. Once even my proposal of creating a raman spectrometer like yours, was not answered for funding or facilitation. However, upon seeing your contribution encouraged me to do now with my own earnings. Hats off for your impression.

I am going to participate and contribute for STEM based education to change the hacking, research and development, situation in india from and at grass root level. Now i think i have the platform to create an impact here. I have learned a lot about the mechanical and optical architectures from your desgins and discussions with other members. I have recently forked your project from github and really trying to contribute to it. Furthermore, i feel so much satisfaction in your project due to complete usage of free tools without any proprietary pollutions.

:)

------------------------------------
However, after reading ur process overview the retrieval of spectrum from internet spectral databases lingers in back of my head all the time. It feels, like that the instrumentation and computing system which is completely decentralized, were then becoming dependent upon the online databases supplied by few r&d and private organizations.
1.) I know that presently, there is no other way to do acquire spectrum for reference. But to start with, raman and other spectral data are needed, which are sold for lot of cash and locked with proprietary formats that are not generic to read.
2.) You may be knowing about food chemicals codex for which we used in MIR spectrometers for calibration and testing of samples. I cannot find any equivalent vast database for NIR or for Raman (both are complementary). !
3.) Regarding sharing, I have a model where people could share their own spectrums about the samples (food, .....) like files in torrent, but using completely decentralized technologies.

It would be great if the process you proposed is completely decentralized.

Do you have any suggestions on that ??
:)

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fl@C@ wrote 10/06/2014 at 16:06 point
Hi Neo,
Thank you for the interest and compliments.. :)

One of my biggest aims is to make this as available to people as possible.. Especially for education.. I'm actually pretty surprised how many people have taken interest.. Which is great, and to hear that people like you are planning to use it for such a great cause...it makes me very happy... and very glad to hear that people are already benefiting from my work..! I'm really glad I decided to share this project..this is the first time I've put anything out there for people to see.....I had no idea people would be so accepting..it's great..

Another major point I wanted to hit was the use of freely available and easy to aquire software and tools as much as possible.. When I decided to share this, I wanted to share all of it... I needed to build one for myself anyway, and wasn't putting it out there for profit or anything... It's means way more to me to hear from people like you that are using it to perpetuate the positivity.. Thank you for that.

When I started this I knew nothing about spectroscopy, raman or otherwise.. It's been a great learning experience, and I'm very happy to hear that others are benefiting from my learning as well! =) I hope you're able to meet your goals, please let me know if there's anything I can do or contribute!

For your points... There is some dependency on the spectral databases...... I've thought about this many times as well. On one hand, you want data that is known good to compare and identify... You are right in that a lot of companies which charge for access to their data... Which I don't like, and you're right..it doesn't fit with the theme of this project.. :) However, I had made contact with a couple alternatives (specifically raman spectra) and received permission for read only access (free of charge) so long as I don't download the entirety of the database.. I am still looking into options in this area..

I had thought of a peer to peer setup where users could contribute and share data.... My concern in the beginning was management... it had occurred to me that you could set up a voting system where the system adds data from a user...then other users get to match and vote for it's integration into the database.. Maybe something where if two people contribute spectra from the same sample, the peers vote and it's possibly averaged or whatever and integrated then shared across everyone... This all sounds very interesting... But I also wonder how accurate the data is in the end.. It seems to me that the spectra you're comparing to wants to be as solid as possible..definitely worth a lot more thought though...

Having said all of that, I am working right now on coding for the portion to share data with peers...not exactly in the napster fashion, but I am experimenting with plot.ly right now...and it's fairly promising.. There's a couple other services on my list to try out as well...

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