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SCIAMACHY Instrument Design

(picture courtesy by TPD-TNO)

• UV-Vis-NIR High Resolution Imaging Double Spectrometer
• passive hyperspectral UV-VIS-NIR sensor
• high straylight suppression
• moderately high spectral resolution
• high spectral stability
• high radiometric accuracy
• high dynamic range (7 - 8 orders of magnitude)
• moderate spatial resolution
• 3 different measurement modes for atmospheric measurements

Scanner Unit

Number of axis:	2
Angular resolution:	2.5 arcsec

Telescope

Aperture Diameter:

31 mm

Spectrometer

Entrance slit, size:	0.190 mm x 9.6 mm
Instantaneous field of view size:	0.045 deg x 1.8 deg
Sun aperture size:	0.06 mm x 3 mm
Sun aperture instantaneous field of view size:	0.045 deg x 0.72 deg

Thermal Control

Optical bench nominal temperature:	253 K
Optical bench orbital temperature variation:	0.25 K
Detector Temperature:	150 K - 235 K
Detector array orbital temperature variation:	0.02 K

In-Flight Calibration H/W

On-Board Diffuser:	aluminium reflection diffuser
Spectral line source:	Hollow cathode discharge lamp, Pt/Cr cathode with Ne filling
White light source:	Tungsten-Halogen 5 Watts lamp with equivalent blackbody temperature of 3000 K.

Measurement Data

Data Processing:	Coadding Mode
Nominal Data Rate: [bit/sec]	400.000
High Data Rate: [bit/sec]	1.867.000
Absolute Datation Accuracy [ms]	10
Relative Datation Accuracy [ms]	1

Budgets

Mass (Budget):[kg]	198
Power(Budget): [W]	122

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