Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983tifi.rept.....b&link_type=abstract
Unknown
Astronomy and Astrophysics
Astrophysics
Astrophysics, Background Radiation, Balloon-Borne Instruments, Far Infrared Radiation, Bandpass Filters, Cooling Systems, Infrared Spectrometers, Low Pass Filters, System Effectiveness
Scientific paper
Two instruments for far infrared astrophysics are described. The first is a broad-band photometer used on White Mountain for astronomical observations from 10 to 30 cm(+1) (300 GHz to 1 THz; lambda, 1 mm to 330 (SIGMA)). The optical system of the telescope includes a light weight, high speed, chopping secondary. The L (4)He-cooled photometer uses low pass filters and a L(3)He-cooled, composite bolometer. The system performance is evaluated, and the site is compared to other possible platforms. The second project is a balloon-borne spectroradiometer to measure the cosmic background radiation from 3 to 10 cm(+1) (100 GHz to 300 GHz; lambda, 3 mm to 1 mm). The apparatus has five bandpass filters with excellent rejection at higher frequencies, a low noise chopper, and an internal calibrator. The design and use of calibrators for such an experiment and develop a model of calibration procedures is described. The calibrations of several reported measurements are analyzed with this model, and flaws are found in one procedure. Finally, the system performance is used to estimate the accuracy this experiment can achieve.
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