DAV 4 UV/VIS Spectrometer

Well, this is the next evolutionary step from when I first bought the Plab 2.5 spectrometer kit

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This is my place to play...My own little private Idaho!

I wanted to talk a little about why I started this project and how it has evolved into something unexpected in such a short time. I bought this kit out of trying to help a friend out who had a sample that they wanted tested to find out what it was (they really just didn't want to spend about 900.00 to take it to a lab and test it, but hey, what are friends for!)

So anyways, I said well let me see what I can come up with and I saw this spectrometer kit and said hey I bet I could take that kit and hype it up to analyze this stuff and see what it is, well it was ruff waters at first, since I had NO experience with spectrometry, only engineering and chemistry, but I never give up and I just kept studying and tinkering and modifying until walla, Plab 2.5 (build 3.0.1 was born!)

I did find out what the sample was (Salicyclic acid with an anti-biotic mixed was in a container where it should not have been...hummm.)

I am getting a new cmos sensor next week, so I'll document that and post up the results, it's a far superior camera module and has better sensitivity, plus I upgraded the DVD design to be even more stable so that will be another great improvement.

The biggest obstacle I have had to overcome to get quality results is stability and alignment of the hardware is very critical!!

top view elp.png

Top view.

Portable Network Graphics (PNG) - 631.92 kB - 10/12/2016 at 12:44


side view elp.png

Side view.

Portable Network Graphics (PNG) - 626.63 kB - 10/12/2016 at 12:43


front view elp.png

Front view of camera mount.

Portable Network Graphics (PNG) - 554.31 kB - 10/12/2016 at 12:41


Portable Network Graphics (PNG) - 681.03 kB - 10/12/2016 at 12:40


Portable Network Graphics (PNG) - 1.98 MB - 05/03/2016 at 21:53


View all 24 files

  • 1 × DVD R/W 18 X 18mm Sq. 8.5 Gigabyte used for diffraction grating
  • 1 × ELP-USBFHD01M-L21 Cmos module-Cost $45.00 ( CMOS 1080P sensor for high quality image and low power consumption.
  • 1 × non-compressible yoga block (high density black foam) very versatile, can be cut very precisely and is non-reflective.
  • 1 × High Performance Black Masking Tape 2" T743-2.0 ThorLabs Inc.,
  • 1 × Gillette Razor Blade open-air entrance slit 0.18mm slit width (entrance for diffraction grating)

View all 11 components

  • Test Run for CMOS camera

    David H Haffner Sr10/16/2016 at 21:06 0 comments

    This is a CFL calibration done today using Spekwin32 control prototype capture program, and this is a test run for the ELP-USBFHD01M-l21 CMOS camera placed in it's mounting enclosure;

  • DAV 5 UV/VIS Spectrometer, CMOS Camera Mount Design

    David H Haffner Sr10/13/2016 at 13:23 0 comments

    This is the new prototype CMOS Camera module mount, for the DAV 5 UV/VIS Spectrometer which I am now starting to bring back to life. I designed the camera mount using FreeCad version 0.16 and sculpted a working model out of high density matte foam.

  • Final Resolution Test for DH 4.2 Homemade Spectrometer

    David H Haffner Sr06/20/2016 at 09:02 0 comments

    400nm UV LED 2D EEM Plot400nm UV thru-the-hole LED 2D EEM Plot

    I tested these 4 LEDs at the highest gain possible, by scanning them straight ahead through the detector's slit with no filter thru an empty glass cuvette. This way I can get a better reading on their true values as compared to their stated values.

    410nm UV high pwr 1W LED 4.0vdc 350mA-Prolight

    470nm Blue high pwr 1W LED 4.0vdc 550mA-Cree

    623nm Red high pwr 1W LED 2.7vdc 700mA-Cree

    400nm UV thru-the-hole LED 40mA 9vdc-Generic

    410nm UV 1W LED 2D EEM Plot

    2D EEM Plot 410nm UV LED

    470nm Blue LED 1W 2D EEM Plot470nm Blue LED 2D EEM Plot

    623nm RED LED 1W 2D EEM Plot623nm RED LED 2D EEM Plot

  • Resolution Test number 2 DH 4.2 Spectrometer Fluorescein

    David H Haffner Sr06/19/2016 at 12:52 0 comments

    This is resolution test number 2 for my spectrometer after adjusting the DVD grating, I scanned a sample of Fluorescein in Ethanol and compared it to that of the standard done by the Oregon Medical Laser Center for the same sample: I have a quantum yield of 62.8 and a peak wavelength of 540nm, which hits the mark at the second peak on the OMLC's plot.

  • Resolution Test using CFL light source

    David H Haffner Sr06/18/2016 at 23:50 0 comments

    I did another resolution test for the DH 4.2 spectrometer today because I made some minor adjustments to the DVD grating and got a really good calibration with a quality fit of 7. ( the middle BLUE band is at 438nm ( 3nm over specs/perfection would be 435nm,) and the GREEN band is at a near perfect 547nm ( 1nm over spec.)

    So I am just tickled pink!!

  • Cost analysis for the DH 4.2 spectrometer (homemade)

    David H Haffner Sr06/17/2016 at 09:59 0 comments

    Well I finally got around to doing a current cost analysis for this project and I was pleased to see I was only .86 cents over budget!

    My initial goal was to build a reliable and accurate homemade spectrometer, with professional industry standard resolution...and I'm getting ohhhh so close!!

  • Tested 3 High Powered LEDs Red, Blue and Violet (UV)

    David H Haffner Sr06/11/2016 at 17:13 0 comments

    Top View and Front View of PWR supply

    I made a new power supply for my LEDs, and wanted to test it out so here are the results of that test:

    Power supply: Old Zip drive/ITE/ Input-120vac 60Hz 0.3A

                                          Output- 5vdc 1A

    Buck puck- LED driver module - 5-14vdc input 1000mA

    400nm UV high pwr LED 3.5vdc 350mA/ Prolight 470nm Blue high pwr LED 3.5vdc 700mA/ Cree 623nm Red high pwr LED 2.7vdc 700mA/ Cree

  • In Case Anyone Was Wondering...:)

    David H Haffner Sr06/06/2016 at 14:12 0 comments

    I posted up some of the equipment that I use to get such precise concentration measurements when I am working with my spectrometer, well just click the picture and you'll find out!!

  • DH 4.2 Spectrometer Calibration June 4th

    David H Haffner Sr06/04/2016 at 12:48 0 comments

    Well, I am within 5nm of the SpexFluoroMax spectrometer that the Oregon Medical Laser Center used for their spectroscopy studies. I am presenting my results here first, so everyone has a chance to soak in the value of a very simple and cost effective design verses a $25,000.00 piece of equipment...

    Remember...within 5nm!!

  • My cat helped me out on this one!

    David H Haffner Sr06/01/2016 at 17:06 0 comments

    I was trying to do something serious this morning, I had to realign the DVD grating in the spectrometer and my cat tee tee had other plans...

    I think I got it right, although for some reason sample 4 has an anomaly ...Hmmm...

View all 26 project logs

  • 1
    Step 1

    These are the initial instructions for building the version 2.5 spectrometer, from these and with much pratical application and modifications the v2.5 (build 3.0.1) was born.

  • 2
    Step 2

    This is the new proto type CMOS Camera module mount, for the DAV 5 UV/VIS Spectrometer which I am now starting to bring back to life. I designed the camera mount using FreeCad version 0.16 and sculpted a working model out of high density matte foam.


  • 3
    Step 3

    This is my new Gillette razor blade open-air slit design; 0.12mm slit width. Verified using my Aries DPSS 150mW 532nm Green Laser through a quartz cuvette containing 99.99% purity Isopropyl alcohol (lab grade certified.)

View all 9 instructions

Enjoy this project?



Dr. Cockroach wrote 08/21/2017 at 13:00 point

Looking good my friend, way beyond me but it all looks great :-)

  Are you sure? yes | no

David H Haffner Sr wrote 08/21/2017 at 16:49 point

Hey DOC, yeah this was the 2nd evolutionary step to my current project :)

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David H Haffner Sr wrote 08/21/2016 at 15:00 point

Hey Jong Kim, yeah the high powered laser is a must, for the raman spectrometry because of its stability, but the 5mW will work, I have used it.

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David H Haffner Sr wrote 08/19/2016 at 07:01 point

Hey Jong Kim, yeah, that;s my Aries 150mW green Portable laser (532nm) it is a DPSS type, here is where I got it from

Dave H

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Jong KIM wrote 08/21/2016 at 12:55 point

Hi, David Haffner Sr. 

  Thank you for your kind reply.
 A few days ago, I've got a low-cost green laser module with 5mW power.  
 I guess, for the Raman spectrometer design, a high powered laser like you have selected is a must.

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Jong KIM wrote 08/19/2016 at 05:59 point

Hi, David. 

Could you possibly give me some info on your 2nd image, next to the  new camera module you employed in this project, which to me looks like a laser module or laser pointer.



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David H Haffner Sr wrote 07/05/2016 at 08:08 point

Thanks Jong KIM, it's stll a ways from begin a Raman instrument but it's operating specs as of right now are surprising even me.

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Jong KIM wrote 07/05/2016 at 05:20 point

Quite superb result!  

Your simple yet powerful spectrometer is aiming toward the analysis by Raman spectrophotometry !

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