Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...428..384l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 428, no. 1, p. 384-392
Astronomy and Astrophysics
Astronomy
17
Calibrating, Dichroism, Infrared Astronomy, Photometers, Spaceborne Telescopes, Bandpass Filters, Bolometers, Cryogenic Cooling, Electronic Modules, Japanese Spacecraft, Submillimeter Waves, Thermistors
Scientific paper
We describe the design and calibration of the Far-Infrared Photometer (FIRP), one of four focal plane instruments on the Infrared Telescope in Space (IRTS). The FIRP will provide absolute photometry in four bands centered at 150, 250, 400, and 700 microns with spectral resolution wavelength/wavelength spread is approximately 3 and spatial resolution delta theta = 0.5 degrees. High sensitivity is achieved by using bolometric detectors operated at 300 mK in an AC bridge circuit. The closed-cycle He-3 refrigerator can be recycled in orbit. A 2 K shutter provides a zero reference for each field of view. More than 10% of the sky will be surveyed during the 3 week mission lifetime with a sensitivity of less than 10-13 W per sq cm per sr per 0.5 degree pixel.
Freund Martin
Hirao Takanori
Lange Andrew E.
Matsumoto Toshio
Sato Sasumu
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