Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1982-06-04
1983-08-23
Arnold, Bruce Y.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356352, G02B 528
Patent
active
044000588
ABSTRACT:
A tunable Fabry-Perot filter for transmitting light in the wavelength range from 3-40 microns is disclosed wherein a pair of low index substrates of refractive index less than 2.4 and positioned between an adjustable spacer means have, on their facing sides, a non-metallic coating of refractive index of at least 4.0 and of optical thickness less than one-half the minimum wavelength to be transmitted. Preferred substrates are potassium halides, cesium halides, and zinc selenide, and preferred high index coatings are from the group of lead telluride, bismuth telluride, germanium telluride and germanium.
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A. K. Jain, W. W. Durand, G. R. Knowles, J. G. Droessler, A Reprint From the Proceedings of SPIE-The International Society for Optical Engineering, Imaging Spectroscopy, Feb. 10-11, 1981, vol. 268.
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Smith, S. D., "A Tunable Infra-Red Interference Filter", Journal of Scientific Instruments, vol. 34, No. 12, Dec., 1957, pp. 492-497.
"Lead Sulphide, Lead Selenide and Lead Telluride", Journal of Scientific Instruments, vol. 32, Jan. 1955, pp. 10-11.
Durand William W.
Peterson Ronald E.
Arnold Bruce Y.
Honeywell Inc.
Ungemach Charles J.
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