BioBoard/Documentation/Optical loss: Difference between revisions
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| Line 2: | Line 2: | ||
Measuring optic loss - different techniques | Measuring optic loss - different techniques | ||
Optic loss as a proxy for biomass | Optic loss as a proxy for biomass | ||
| Line 7: | Line 8: | ||
Light source and light sensor pairing | Light source and light sensor pairing | ||
Discussion of pros/cons of different source/sensor pairs | Discussion of pros/cons of different source/sensor pairs | ||
==What you need== | ==What you need== | ||
IR LED | *IR LED | ||
Phototransistor | *Phototransistor | ||
2 5kΩ resistors | *2 5kΩ resistors | ||
Wire | *Wire | ||
Soldering iron + solder | *Soldering iron + solder | ||
¾" acrylic tube | *¾" acrylic tube | ||
¾" acrylic discs | *¾" acrylic discs | ||
Acrylic cement (thick) | *Acrylic cement (thick) | ||
1" PVC pipe | *1" PVC pipe | ||
Aquarium glue/hot glue | *Aquarium glue/hot glue | ||
Optional: cell-phone motor (BubbleShaker Technology) | Optional: cell-phone motor (BubbleShaker Technology) | ||
| Line 26: | Line 29: | ||
Cutting acrylic and PVC | Cutting acrylic and PVC | ||
Drilling holes | Drilling holes | ||
Soldering wires | Soldering wires | ||
Fixing diodes | Fixing diodes | ||
Glueing discs on tubes | Glueing discs on tubes | ||
Plugging tubes | Plugging tubes | ||
Covering it up | Covering it up | ||
| Line 36: | Line 45: | ||
Aquarium glue vs hot glue | Aquarium glue vs hot glue | ||
Biologically inert materials | Biologically inert materials | ||
Food safety | Food safety | ||
| Line 46: | Line 57: | ||
How to find out whether your measurements are accurate | How to find out whether your measurements are accurate | ||
How to adjust (distance, resistance) | How to adjust (distance, resistance) | ||
| Line 55: | Line 67: | ||
Reduction of light passing through a mass | Reduction of light passing through a mass | ||
Absorbance vs. scattering | Absorbance vs. scattering | ||
Revision as of 22:22, 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