Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1986-03-03
1987-11-03
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250349, G01J 510
Patent
active
047045345
ABSTRACT:
A thermal radiation detector comprises detecting means supported by a flexible film.
To improve the absorption of incident radiation by the thermal radiation detector, the detector comprises an electrically resistive layer which is immediately adjacent the flexible film, and to which the detecting means are thermally coupled. The optical thickness of transparent dielectric material preceding the detecting means (suitably consisting only of the flexible film) is one fourth of a selected wavelength in a given wavelength range to be detected. The wavelength is selected so that the absorption of incident radiation by the resistive layer is substantially a maximum at the selected wavelength. The resistive layer may be between the flexible film and the detecting means, or it may precede the flexible film. In the latter case, an electrically conductive, reflecting layer is disposed between the flexible film and the detecting means.
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Annis, A. D., et al., "Absorption of Radiation in PLZT Pyroelectric Detectors.", Infrared Physics, vol. 14, pp. 199-205 (1974).
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Hadley, L. N., et al. "Reflection and Transmission Interference Filters.", Journal of the Optical Society of America", vol. 37, No. 6, pp. 451-465 (Jun. 1947).
LaDelfe, P. C., et al., "The Application of Thin Film Absorber Coatings to Enhance the Sensitivity of Fast Pyroelectric Detectors.", SPIE, vol. 380, pp. 266-274 (1983).
Silberg, P. A. "Infrared Absorption of Three-Layer Films.", Journal of the Optical Society of America, vol. 47, No. 7, pp. 575-578 (Jul. 1957).
Fields Carolyn E.
Schechter Marc D.
U.S. Philips Corporation
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