Infrared radiation detector with integral fresnel lens window

Details Infrared radiation detector with integral fresnel lens window Infrared radiation detector with integral fresnel lens window

1985-08-19

1987-07-21

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250353, G01J 508

Patent

active

046820302

ABSTRACT:
An infrared radiation detector comprises a pyroelectric detector element in a hermetically sealed housing. The housing comprises a base and cover with an aperture. A Fresnel lens, for example made of polyethylene transmissive in the 8-14 .mu.m wavelength range, is fastened over the aperture on the inside of the cover for condensing the radiation to be detected onto the detector element. In one example the Fresnel lens is held against a flange surrounding the aperture by a press-fit ring. Alternatively, the Fresnel lens is glued to a silicon window which in turn is fastened to the flange surrounding the aperture. The Fresnel lens thus forms an integral part of the detector housing avoiding the need for external mirrors or lenses.

REFERENCES:
patent: 4493535 (1985-01-01), Champeau
Hiroshi Takeuchi, Noriaki Hara, Teruo Kobayashi, Takashi Takeda and Kazumasa Yamamoto, "Pyroelectric Polymer Infrared Detector" National Technical Report vol. 26, No. 3, (Jun. 1980) pp. 413-423.

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