
Sensor box with 12 multi-spectral sensors (two upper rows) and 6 thermal infrared sensors (bottom row)
The multi-spectral measurements are made using an array of 15° FOV Skye 4-channel sensors, each with 0-5 V signal output. When installed, these sensors are configured in a similar way to the Everest thermal infrared radiometers (bottom row in first picture), such that the six downward-looking sensors have the same incidence angle and footprints as the six PLMR beams. However, to correct for incident radiation, an upward-looking sensor with cosine diffuser is also installed. Each sensor weighs approximately 400g and has a size of 8.2cm × 4.4cm without the cosine diffuser or field of view collar attached). Two arrays of 4 channel sensors are installed, with the following (matched) spectral bands:
Sensor VIS/NIR (SKR 1850A) |
Channel 1 |
MODIS Band 1 |
620-670nm |
Channel 2 |
MODIS Band 2 |
841-876nm |
Channel 3 |
MODIS Band 3 |
459-479nm |
Channel 4 |
MODIS Band 4 |
545-565nm |
Sensor SWIR (SKR 1870A) |
Channel 1 |
MODIS Band 6 |
1628-1652nm |
Channel 2 |
|
2026-2036nm |
Channel 3 |
MODIS Band 7 |
2105-2155nm |
Channel 4 |
|
2206-2216nm |
|