BioBoard/Documentation/Optical loss
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Introduction to absorbance
Measuring optic loss - different techniques
Optic loss as a proxy for biomass
Building an NIR probe
Light source and light sensor pairing
Discussion of pros/cons of different source/sensor pairs
What you need
- IR LED
- Phototransistor
- 2 5kΩ resistors
- Wire
- Soldering iron + solder
- ¾" acrylic tube
- ¾" acrylic discs
- Acrylic cement (thick)
- 1" PVC pipe
- Aquarium glue/hot glue
Optional: cell-phone motor (BubbleShaker Technology)
How to build it
Cutting acrylic and PVC
Drilling holes
Soldering wires
Fixing diodes
Glueing discs on tubes
Plugging tubes
Covering it up
Things to keep in mind
Aquarium glue vs hot glue
Biologically inert materials
Food safety
Interfacing and measuring
Arduino sketch should go here...
Calibrating
How to find out whether your measurements are accurate
How to adjust (distance, resistance)
Making it cooler
Multi-channel measurements
Geeking out
Reduction of light passing through a mass
Absorbance vs. scattering
Links
Optek