Liquid crystal chopper and infrared sensor

Details Liquid crystal chopper and infrared sensor Liquid crystal chopper and infrared sensor

1990-02-20

1991-07-30

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503383, 350331T, G02F 113

Patent

active

050361996

ABSTRACT:
A liquid crystal chopper comprising a pair of electrically conductive substrates, a spacer keeping the substrates so as to define a space between the substrates, and a liquid crystal of DSM type which is enclosed in the space, with a dielectric anisotropy of -0.5 or more and not exceeding 0. An infrared sensor using the liquid crystal chopper in the above construction as a chopper mechanism to intermittently interrupt infrared rays incident upon the pyroelectric element. The infrared sensor has a short response time at the liquid crystal chopper and consumes less power.

REFERENCES:
patent: 4066334 (1978-01-01), Fray et al.
patent: 4849634 (1989-07-01), Riedl

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