Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.270..151n&link_type=abstract
In ESA, Proceedings of the 8th ESA Symposium on European Rocket and Balloon Programs and Related Research p 151-155 (SEE N88-162
Astronomy and Astrophysics
Astronomy
Balloon-Borne Instruments, Fabry-Perot Spectrometers, Infrared Astronomy, Infrared Spectrometers, Cryogenic Cooling, Far Infrared Radiation, Liquid Helium, Mesh
Scientific paper
A liquid helium-cooled Fabry-Perot spectrometer for the far infrared spectral region is described. The Fabry-Perot filters consist of vacuum-spaced gold grids on crystal quartz substrates. Finesses between 30 and 60 and transmissions between 70% and 35%, respectively, were measured at 3 K. All nonactive crystal quartz surfaces are antireflection coated with 25 micron thick polyethylene. Using the scanning Fabry-Perot in the 28th order a spectral resolution of 800 is achieved at 160 microns. Scanning is mechanical without servocontrols to an accuracy corresponding to a finesse of 80. The detector used is a stressed, Ga-doped Ge-crystal having an intrinsic NEP of 10 to the minus 16th power WHz sup-1/2.
Nordh Lennart H.
Olofsson S. G.
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