DAIS 7915

The Digital Airborne Imaging Spectrometer DAIS 7915 is a 79 channel high resolution optical spectrometer which collects information from the Earth's surface in the 0.4 - 12.3 µm wavelengths region while scanning from an aircraft, electronically processes this data into digital format consisting of 16 bit words, and records these digital data on a cartridge recorder.
The DAIS scan mechanism is a Kennedy type where a cubic polygon mirror scans the terrain below through the opened window hatch in the bottom of the aircraft. The scan mirror rotates anti clockwise with respect to the aircraft heading to provide a ground element cross track scanning motion while the forward motion of the aircraft provides a requested line-by-line scan.

Spectral band specifications, main radiometric, and geometric instrument parameters of the DAIS 7915.

Spectrometer Characteristics
Wavelength range: 400nm - 12.6µm, 4 Spectrometers, 79 bands

	Range	Bands	Bandwidth	Detector
1	400 - 1000 nm	32	15-30 nm	Si
2	1500 - 1800 nm	8	45 nm	InSb
3	2000 - 2500 nm 3000 - 5000 nm	32 1	20 nm 2.0 µm	InSb
4	8000 -12600 nm	6	0.9 µm	MCT

Main radiometric parameters

Dynamic range:  15 bit  (no gain settings) Sensitivity VIS/NIR: NER  < 0.025 mW/cm²sr µm SWIR: NER  < 0.025 mW/cm²sr µm MIR/TIR: NET  < 0.1 K

Main geometric parameters

FOV: 0.894 rad (+-26 degrees) on DO 228, depending on aircraft. max. +-39 IFOV: 3.3 mrad, (0.189 degrees) GIFOV:  5 - 20 m depending on aircraft altitude

For more information, please visit the DLR's DAIS Home Page

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