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Python Simulation of Light Coverage on a Petri Dish
05/02/2024 at 20:42 • 0 commentsI was getting a lot of glare with the IR emitting LED above the petri dish. I read that moving the LEDs to the side to have a 45 degree angle of incidence would reduce glare.
To figure out the placement of the LEDs I wrote a python script that visualized the light coverage.
My next step is to add a top down view to the script
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First pass of adding IR emitter
04/17/2024 at 03:37 • 0 commentsI found a 940 nm LED IR emitter at the maker space that is able to illuminate the Petri dish cover. At first I thought it was not working, but then another member at the maker space helped me realize the IR emitter has a narrow emittance band (18 degrees). After pointing the IR LED towards the bottom I was able to see objects inside the cover.
Fig 1)
Fig 1: 90 degree LED position is the left image and 45 degree LED position is the right image.
Interestingly the flatworms who up very bright in the IR light.
Fig 2)
Fig 2: Hard to tell if the bright spots are the flatworms or artifacts of the water in the Petri dish.
Possible improvements
* Try a ~840 nm LED for increased brightness
* Add one or two more IR emitters
* Add sockets into the cover roof for the IR emitters
* Add a "lens shroud" around the camera hole opening