Pyroelectric detector arrangement

Details Pyroelectric detector arrangement Pyroelectric detector arrangement

1987-09-01

1989-01-24

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

250353, 340661, G08B 1318

Patent

active

048003689

ABSTRACT:
An arrangement for detecting the passage of living beings into and out of a surveillance region includes optics which concentrate thermal radiation energy from the surveillance region into a detection zone where an active area of a pyroelectric detector is situated and converts the thermal radiation energy received thereby into an electrical signal. An evaluating device evaluates the electrical signal of the detector to provide an indication of either the entry of a living being from the outside into, or the exit of a person from, the surveillance region from a change in the total thermal radiation energy received by the active area from the surveillance region. The optics may incorporate a mask which prevents thermal radiation from the outside of the surveillance region from reaching the active area of the detector. The mask includes a marginal portion which peripherally bounds an opening for the passage of the thermal radiation energy from the surveillance region to the detection zone and which may include at least one serration at the opening for controlling the timing of the electrical signal caused by entry of a living being into an area of the surveillance region corresponding to the serration relative to those caused by entry of a living being into the remainder of the surveillance region.

REFERENCES:
patent: 3207266 (1965-09-01), Hornung
patent: 3972021 (1976-07-01), Leitz et al.
patent: 4263585 (1981-04-01), Schaefer
patent: 4346427 (1982-08-01), Blissett et al.
patent: 4431918 (1984-02-01), White
patent: 4510488 (1985-04-01), St. Jean et al.
patent: 4734585 (1988-03-01), Owers

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