Onboard Infrared Fourier Spectrometer
- Purpose: Obtaining global data for numerical weather prediction and climate studies, including: 1) vertical profiles of temperature in the troposphere and lower stratosphere with an error of 1-2 K; 2) vertical profiles of humidity in the troposphere with an error of no more than 30%; 3) the total ozone content with an error not less than 5% and the vertical O3 profile in the ozone layer with an error of 15%; 4) temperature of the underlying surface with an error of
| Parameter | Value |
|---|---|
| Operation specrtal range | 5-15 mkm |
| Spectral resolution, no more | 0,5 1/sm |
| Threshold spectral brightness (NESR), (mW*sm)/(m2*average) | 0,15-0,45 |
| The measurement error of the spectral brightness of the object (in terms of equivalent temperature) at a wavelength of 11 ... 12 microns and at an object temperature of 280 ... 300 K | 0,5 K |
| Swath width | to 2500 km |
| Spatial resolution in nadir | 30 km |
| Interferogram filming time | 0,5 s |
| Mass | 50 kg |
| Power consumption (average per revolution) | 50 W |
| Imformation flow | 600 kbit/s |
Infrared instrumentation for measuring the spectra of outgoing thermal radiation of the surface-atmosphere system with high spectral resolution in the interests of operational meteorology and climatology.
Features:
- sealed opto-mechanical unit mounted on spacecraft platform; electronic module - in the pressurized cabin;
- scanning the span in the direction transverse to the flight direction of the spacecraft;
- the mechanism for changing the optical path difference is a “double pendulum” with corner reflectors;
- radiation cooler for cooling down the photodetector (SRT-photoresistor);
- unit of lasers of the reference channel to provide spectral measurement binding;
- periodic observation of reference sources (airborne blackbody and space) for radiometric measurement calibration.
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