BioBoard/Documentation/Optical loss: Difference between revisions
(Created page with '=Introduction to absorbance= =Building an NIR probe= ==What you need== ==How to build it== ==Things to keep in mind== =Interfacing and measuring= =Calibrating= =Making it …') |
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=Introduction to absorbance= | =Introduction to absorbance= | ||
Measuring optic loss - different techniques | |||
Optic loss as a proxy for biomass | |||
=Building an NIR probe= | =Building an NIR probe= | ||
Light source and light sensor pairing | |||
Discussion of pros/cons of different source/sensor pairs | |||
==What you need== | ==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== | ==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== | ==Things to keep in mind== | ||
Aquarium glue vs hot glue | |||
Biologically inert materials | |||
Food safety | |||
=Interfacing and measuring= | =Interfacing and measuring= | ||
Arduino sketch should go here... | |||
=Calibrating= | =Calibrating= | ||
How to find out whether your measurements are accurate | |||
How to adjust (distance, resistance) | |||
=Making it cooler= | =Making it cooler= | ||
Multi-channel measurements | |||
=Geeking out= | =Geeking out= | ||
Reduction of light passing through a mass | |||
Absorbance vs. scattering | |||
=Links= | =Links= | ||
Optek | |||
Revision as of 22:20, 26 April 2011
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