1989-03-31
1991-02-26
Arnold, Bruce Y.
350269, 350321, G02B 2602, G02B 2700
Patent
active
049957007
ABSTRACT:
A magnetically operated shutter mechanism is provided that will function in cryogenic or cryogenic zero gravity environments to selectively block radiation such as light from passing through a window to a target object such as a mirror or detector located inside a cryogenic container such as a dewar. The mechanism includes a shutter paddle blade that is moved by an electromagnetically actuated torquing device between an open position where the target object is exposed to ambient radiation or light and a closed position where the shutter paddle blade shields the ambient radiation or light from the target object. The purpose of the shuttering device is to prevent the mirror or other target object from being directly exposed to radiation passing through the window located on the side wall of the dewar, thereby decreasing or eliminating any temperature gradient that would occur within the target object due to exposure to the radiation. A special nylon bearing system is utilized to prevent the device from binding during operation and the paddle blade is also termally connected to a reservoir containing the cryogen to further reduce the internal temperature.
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Thomas J. Magner and Richard D. Barney, "Interferometric Phase Measurement of Zerodur, Aluminum and SXA Mirrors at Cryogenic Temperatures", Apr. 4-5, 1988, pp. 29-37, published in Proceedings of the International Society for Optical Engineering, vol. 929.
Barney Richard D.
Magner Thomas J.
Adams Harold W.
Arnold Bruce Y.
Clohan, Jr. Paul S.
Merchant R. Dennis
Nguyen Thong
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