School of Mathematics and Natural Sciences

CRISTA-NF - a Helium-cooled Infrared Telescope for the Atmosphere

The technical Realization

CRISTA-NF utilizes two grating spectrometers simultaneously to measure the infrared radiation of atmospheric trace gases using 15 infrared detectors. The telescope holds a turnable primary mirror which is aligned to the respective altitude by the electronics control system.

The complete optics is housed in a cryostat which provides the necessary operating temperature of about - 260 oC. The cryostat holds a Helium tank with a maximum capacity of 125 Liter which accounts for 60 hours of hold time.

An ample electronics monitors and controls the instruments and records scientific data. A unique position control system calculates the exact roll position and adjusts the primary mirror accordingly.

Additional details are provided in the following list of technical data:

Length 1910 mm
Diameter of Vacuum Shell 850 mm
Weight 360 kg
Volume of Helium Tank 125 l
Telescope Herschel-Teleskop (120 mm)
Altitude Range 5 - 20 km
Vertical Resolution 200 -300 m
Pointing Accuracy horizontally +/- 30 arc min
Pointing Accuracy vertically +/- 30 arc sec
Spectrometer 2 Ebert-Fastie Spektrometer
Spectral Resolution HRS 1000
Spectral Resolution LRS 500
Time per Spectrum 1 s
Time per altitude profile 1 min

zuletzt bearbeitet am: 29.04.2022

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