ATMS 748 Grad Atmospheric Instrumentation [main page] [assignments] [daily notes].

 

I3 three directional spectral irradiance instrument description

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

Presentation

Report

Electrical Schematics

Sensor head schematic; board layout.

Data acquisition and Teensy board transmitting side schematic.

Teensy board receiving side schematic.

Software

Transmitting side Teensy sketch.

Receiving side Teensy sketch.

Labview code.

 

 

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.