Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..505f&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, P. (12)505-(12)508
Astronomy and Astrophysics
Astronomy
Astronomical Satellites, Calibrating, Experiment Design, Far Infrared Radiation, Infrared Astronomy, Photometers, Satellite-Borne Instruments, Bolometers, Cryostats, Infrared Telescopes, Japanese Spacecraft, Shutters
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 micrometers with spectral resolution lambda/(Delta lambda) approx. = 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 approximately 3 week mission lifetime with a sensitivity of less than 10-13 W/((sq cm)(sr)) per 0.5 degree pixel.
Brubaker G. K.
Duband Lionel
Freund Martin
Grossman Becky
Hirao Takanori
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