Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977infph..17..405b&link_type=abstract
Infrared Physics, vol. 17, Sept. 1977, p. 405-413. Research supported by the Royal Observatory.
Astronomy and Astrophysics
Astronomy
3
Infrared Astronomy, Infrared Spectrophotometers, Apertures, Collimators, Cryostats, Focal Plane Devices, Focusing, Mirrors, Rc Circuits, Servocontrol, Signal To Noise Ratios, Spectral Bands
Scientific paper
A wide-field photometer was designed, built and used for the detection of extended infrared sources. A maximum sky area of 25 mm diameter in the focal plane of a telescope is integrated on a single 4 x 4 mm PbS detector by using focal reduction optics. Maximum sky-comparison amplitudes of 25 mm are achieved at frequencies between 2 to 60 Hz using a tilting spherical mirror placed at the image of the telescope objective stop. Good square waveforms and position offsetting of the tilting mirror are achieved with a servo system using an R-C bridge position detection system. The instrument was successfully used in 1975 to detect globular clusters in the H and K bands.
Baddiley C. J.
Ring James
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