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:
|Diameter of Vacuum Shell||850 mm|
|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