Pyroelectric infrared detector with an improved sensing element

Details Pyroelectric infrared detector with an improved sensing element Pyroelectric infrared detector with an improved sensing element

1993-03-18

1995-07-11

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

G01J 502

Patent

active

054323509

ABSTRACT:
A useful pyroelectric infrared detector capable of cancelling noises and detecting dead angles, and accurately detecting a moving direction of a moving body is provided. Four sensing electrodes having an identical shape, area, and sensitivity are formed on a surface of a pyroelectric member in an L-shaped form, so that they are arranged to differ by 90 degrees in phase, respectively, but are symmetric about a center of rotation. The four sensing electrodes form two pairs of dual detecting elements so that output may be provided from the respective first and second dual elements I and II and be appropriately processed.

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