INFRARED FOURIER-SPECTROMETER SICH-F

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INFRARED FOURIER-SPECTROMETER SICH-F
INFRARED FOURIER-SPECTROMETER SICH-F

Measurement principle

Infrared Fourier-transform spectrometer SICH-F is intended for spectral distribution power measuring of atmospheric and ionospheric emissions in range of 2 - 9 mkm and it's height distribution. Instrument work regimes: 1) Inside. 2) Calibration at inside standard sources 2 - 4 times per a rotation. 3) Calibration at "free space" 2 - 4 times per a rotation. 4) Infrared radiation measuring 10 - 40 min. per a rotation.

Experiment configuration and heritage

Spectrometer consists of the photodetector block and the block of signal processing and control.

Photodetector block is set onto external surface of station. Optical axis direction 1 is set at angle of 18° to satellite velocity vector and it is located in plane «velocity vector - Nadir».

- Optical axis scanning 1 - +5 –30 deg

- Optical axis direction 2 - Zenith +-50 deg

- There haven't to be satellite device details into space angle +20 deg

Diagnostic information and attach data will transfer by state telemetric channels.

Four digital channels:

1. Detector temperature.

2. Engine temperature.

3. Absolute black body temperature.

4. Beamsplitter temperature.

Three analog channels:

1. Reper mark frequency.

2. Black body current.

3. Signal roughly.

Digital 5 channels:

1. Calibration 1.

2. Calibration 2.

3. Calibration 3.

4. Calibration 4.

Main characteristic of the SICH-F instrument

Sight field: 0.5 degree

Space resolution: 5 km (vertically)

Spectral resolution 2 cm

Time resolution 1 - 4 s

Spectrometer consists of next blocks:
- Photodetector block.
  - Dimensions 480x280x170 mm
  - Weight < 10 kg
  - Using power < 12 W
  - Block has two radiation enters
  Demands for device:
  - Block is set onto external surface of station;
  - Optical axis direction 1 is set angle of 18 vector and it is in plane: speed vector - Nadir.
  - Optical axis scanning 1 - +5
  - Optical axis direction 2 - Zenith +50
  - There haven't to be satellite device details into space angle +20
- Block of signal processing and control
  - dimensions 270x260x160 mm
  - weight < 8 kg
  - using power < 18 W
  - Block is set inside of station.
Total using power < 30 W

Total weight < 18 kg
Instrument work regimes:
- Inside
- Calibration at inside standard sources 2 - 4 times per a rotation.
- Calibration at "free space" 2 - 4 times per a rotation.
- Infrared radiation measuring 10 - 40 min. per a rotation.
Instrument control commands.
- For the instrument control (choice from four regimes, program controller control, scanning regime definition etc.) the corresponding channels have to have eight dry contacts "to switching".
- Before this the instrument will use with service commands "LIGHT" and "SHADOW".
- Instrument disfixing and it's transfer for duty-regime will be carried out during first connection of board net in 27 V and will not require separate commands.
Data structure.

Data to go out from instrument is separated for two types:

scientific data and technical ones (diagnostic) that testifies about capacity for work of instrument at all and it's separate system condition.
- Scientific data (1 block under 16K per one measuring).
  
  This data enters with each measuring and is necessary for discipherring and interpretation obtained results:
  - Spectrum or interferogram.
  - Object's sign.
  - Regime sign.
  - Scanner’s position.
  - Gain factor.
  - Sign of move smooth.
  - Interferogram "zero" position.
  - Tests pass sign.
  - Attenuated position.
It should have consistent channel of RS232 type or like to it. Total volume of receive information is resulted in point 8 it's TCh.

Diagnostic information and attach data will transfer by state telemetric channels.
- Four channels :
  - Detector temperature.
  - Engine temperature.
  - Absolute black body temperature.
  - Beamsplitter temperature.
- Three analog channels:
  - Reper mark frequency.
  - Black body current.
  - Signal roughly.
- Digital 5 channels:
  - Calibration 1.
  - Calibration 2.
  - Calibration 3.
  - Calibration 4.
Total volume of information transferring to Earth at receive rate of one spectrum is:

For one cycle for one for of measuring rotation 24 hours

Regime "L" 4 2400-4800 till 115000

Regime "Sh" 8 4800-9600 till 230000
Total regime of instrument work is separate periods in a rotation (it is mainly in zone of Earth shadow).
The instrument will switch on automatically by signals of own detectors taking into account service commands "LIGHT" and "SHADOW".