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Optical Density Sensor aka Kafi-Schnapps Detektor

by dusjagr, published

Optical Density Sensor aka Kafi-Schnapps Detektor by dusjagr Apr 15, 2013

Description

This standalone sensor allows to measure the optical density (OD) aka turbidity through a standardized cuvette. 1-Channel for different wavelengths use multiple sensors with different 5mm LEDs. The design fits nicely a TIL-99 phototransistor.

see more on: hackteria.org/?p=2194

Recent Comments

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Awesome! I have ordered some parts to build a very similar device, I'll post a derivative soon when I end up making it. Thanks for the inspiration!

Awesome! I have ordered some parts to build a very similar device, I'll post a derivative soon when I end up making it. Thanks for the inspiration!

Awesome! I have ordered some parts to build a very similar device, I'll post a derivative soon when I end up making it. Thanks for the inspiration!

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Instructions

The layers were made using 3mm MDF and laser cut. The settings for rastering need to be optimized to have the right thickness to perfectly fit the LED in between. Same for the depth of the pin-header row.

The sensor can be read using an arduino or a BabyMidiGnusbuino. Various tests have been run on the BabyMidiGnusbuino (a 2$ variant arduino compatible a85 platform), using pure data and MIDI to talk to the sensor. Especially Kafi-Schnapps is very useful for calibration and getting the detection limits of the sensor.
wiki.sgmk-ssam.ch/index.php/Babygnusbuino

see details on: hackteria.org/wiki/index.php/DIY_spectrophotometer

Comments

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destroyer2012 on Apr 17, 2013 said:

I hope you don't mind if I ask you a few questions:

1) Have you tried measuring bacteria turbidity with this and what is the performance in comparison to actual lab equipment?
2) How do you use a phototransistor to measure the light level? I have only ever used photoresistors..
3) What is a "TIL-99" and how do I get this?
4) How much is this device affected by the ambient light levels?

dusjagr on Apr 17, 2013 said:

1) i have checked some bacteria turbitiy, yes. getting nice results, very high resolution, but havent calibrated or checked with a commercial equipment yet... give me a few days :-)

2) Phototransistors are much faster and more linear, check web for it.

3) some old phototransistor that was lying around...

4) almost no effect from ambient light, but i made another layer now on top to be sure.

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