Pyroelectric infrared sensors

Details Pyroelectric infrared sensors Pyroelectric infrared sensors

1988-12-07

1990-06-12

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, G01V 904

Patent

active

049335600

ABSTRACT:
An infrared radiation sensor is provided comprising an infrared optical system and a pyroelectric radiation detector for receiving infrared radiation from the optical system and generating an output signal. The optical system has a lens (6) arranged to feed source radiation through an aperture (9) into a reflective radiation cavity (10), the lens and the aperture defining a radiation sensitive angular zone width and direction (2,3,4,5) for the sensor. The pyroelectric radiation detector comprises a film (11) of pyroelectric plastics material within the cavity. The film area can be made large within the cavity without affecting the angular resolution of the sensor which is controlled by the ratio of the optical system focal length to the aperture width.

REFERENCES:
patent: 3792275 (1974-02-01), Leftwich et al.
patent: 4429223 (1984-01-01), Wagli
patent: 4717821 (1988-01-01), Messiou

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