Pyroelectric sensing apparatus substantially independent of nois

Details Pyroelectric sensing apparatus substantially independent of nois Pyroelectric sensing apparatus substantially independent of nois

1989-10-31

1991-09-24

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307310, 307234, 307516, 328111, 219494, G01K 700, H03K 522, H01L 3100, H05B 102

Patent

active

050517015

ABSTRACT:
A pyroelectric sensing apparatus is provided with an A/D convertor 29, whose digital output is examined whether continuation time period of the output from the pyroelectric element is longer than a predetermined reference time period such as 500 m sec; thereby mal-operation due to noise output from the pyroelectric element generated by mechanical shock (door close) or electric shock (pulling out a plug of other apparatus) is eliminated.

REFERENCES:
patent: 3268453 (1966-08-01), Ouchi et al.
patent: 4401884 (1983-08-01), Kusunoki et al.

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