Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259..696l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 2, p. 696-700.
Astronomy and Astrophysics
Astrophysics
5
Beam Switching, Focal Plane Devices, Infrared Photometry, Infrared Telescopes, Mirrors, Background Noise, High Resolution, Spatial Resolution, Thermal Noise
Scientific paper
We describe a technique for canceling the background during infrared observations without moving the telescope (without beam-switching). The secondary mirror is chopped between three positions: one on the source and the other two on opposite sides of the source. Some advantages over the traditional two-beam chopping with beam-switching are: higher observing efficiency, continuous monitoring of the source, cancellation of more rapidly changing noise sources, and elimination of the need to maintain any relation between the chopper throw and the amplitude of telescope motion during beam-switching. The technique also greatly simplifies observing with infrared arrays. It is simple to implement the method, both for computer-controlled secondaries and for those controlled by analog signals. Observations between 2 and 20 microns from two observatories are discussed.
Grasdalen Gary
Landau Robert
Sloan Greg C.
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