Another chopper design for astronomical infrared photometry

Details Another chopper design for astronomical infrared photometry Another chopper design for astronomical infrared photometry

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....48...33k&link_type=abstract

Astronomy and Astrophysics, vol. 48, no. 1, Apr. 1976, p. 33-37. Research supported by the Nederlandse Organisatie voor Zuiver-

Astronomy and Astrophysics

Astrophysics

4

Astronomical Photometry, Design Analysis, Electric Choppers, Infrared Instruments, Infrared Photometry, Telescopes, Computer Storage Devices, Electric Coils, Focal Plane Devices, Infrared Tracking, Mirrors, Modulation Transfer Function, Mossbauer Effect, Optical Equipment, Resonant Frequencies, Suspending (Hanging)

Scientific paper

The present chopper is designed for use in or near the focal plane of an optical telescope adapted for IR photometry. The principle of focal-plane chopping is outlined, and the basic design characteristics of the chopper are described, including the coil-cylinder assembly, the suspension system, and the electronic system. The modulation function is discussed along with storage of the computer-calculated input signal in a programmable read-only memory. Some applications of the device are reviewed, and it is noted that the chopper generates no audible noise or mechanically induced detector signals.

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