Electronics board, with radio antenna out the bottom of the box.
Sensor head: North, overhead, and south facing. North and south facing may have 'shrouds' installed as a test, later, to investigate reduction of surface reflection contribution.
This instrument was developed by the ATMS 748 Atmospheric Instrumentation class of 2016.
Electronics board, with radio antenna out the bottom of the box. |
|
Sensor head: North, overhead, and south facing. North and south facing may have 'shrouds' installed as a test, later, to investigate reduction of surface reflection contribution. |
Overall description |
Electrical SchematicsSensor head schematic; board layout. Data acquisition and Teensy board transmitting side schematic. Teensy board receiving side schematic. |
Software |
The sensor currents were measured, and feedback resistors for the opamps were determined.
Here's the spreadsheet, and summary table.
| Molex Pins | Sensor Head Wires | White Cable 9 conductor wire assignments, crimps | Hookup Wire Colors on breadboard |
8 |
415 nm cathode photodiode |
Blue | Black |
| 7 | 500 nm cathode photodiode | Green | Green |
| 6 | 600 nm cathode photodiode | Red | Red |
| 5 | 870 nm cathode photodiode | Black Red | Yellow |
| 4 | 950 nm cathode photodiode | White | White |
| 3 | + Temperature | Black Blue | Orange |
| 2 | - Temperature | Black White | short green |
| 1 | Common Anode ground | Black Green and Ground Shield | short green |
Data File Structure out of USB to Serial on receiving end (to Labview from Teensy)
All output data will
be analog to digital counts, 16 bits, maximum integer values of 65535.
| North Facing Sensor | Overhead Sensor |
South Facing Sensor | Thermodynamics | |||||||||||||||
| 415 nm | 500 nm | 600 nm | 870 nm | 950 nm | 415 nm | 500 nm | 600 nm | 870 nm | 950 nm | 415 nm | 500 nm | 600 nm | 870 nm | 950 nm | Pressure | Electronics box temperature | Sensor Head temperature | Vcc (for pressure reference) |
| ADC 2.1 | ADC 2.0 | ADC 1.3 |
ADC 1.2 | ADC 1.1 | ADC 3.2 | ADC 3.1 | ADC 3.0 | ADC 2.3 | ADC 2.2 | ADC 4.3 | ADC 4.2 | ADC 4.1 | ADC 4.0 | ADC 3.3 | ADC 1.0 |
Properties of photodiodes/filters used.
| mfg and part # | Center wavelength (nm) | Full Width Half Maximum (nm) | Center wavelength filter transmission (%) | Out of Peak Blocking Optical Depth |
Intor FP18-0415 |
415 +- 2 | 10 +- 2 | 43 | 4 |
| Intor FP18-0500 | 500 +-2 | 10 +-2 | 50 | 4 |
| Coherent 33-8434-000 | 600 | 40 | n.a. | n.a. |
| Intor FP18-0870 | 870 +-2 | 10 +-2 | 45 | 4 |
| Coherent 33-9077-000 | 950 | 10 | n.a. | n.a. |