BioBoard/Documentation/Optical loss
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