Physics – Optics
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974tsbb.nasa...91d&link_type=abstract
In NASA. Ames Res. Center Telescope Systems for Balloon-Borne Res. p 91-106 (SEE N75-12735 03-74)
Physics
Optics
Balloon-Borne Instruments, Cassegrain Optics, High Altitude Balloons, Liquid Helium, Radiometers, Telescopes, Cooling Systems, Data Acquisition, Focal Plane Devices, Signal To Noise Ratios, Temperature Control
Scientific paper
The development of a cryogenically cooled filter radiometer for use with high altitude balloons is discussed. The radiometer has features which include the options for remote operation of two filter wheels each containing six filters at helium temperature and a cryogenic rotary chopper which may be run at 200 cycles per second or positioned open or closed, and a remotely operable chopped blackbody calibration source. The radiometer contains a ten inch diameter liquid nitrogen cooled Cassegrain telescope with nine individually filtered field stops in the focal plane. The telescope is mounted on a two-axis servo operated gimbal which is used to make sky scans under the control of an onboard programmer.
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