Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1984-05-21
1986-09-30
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
250340, 250370, 250371, G08B 1318
Patent
active
046149384
ABSTRACT:
An intrusion detection system includes a plurality of infrared radiation sensitive elements, each of which comprises first and second spaced electrodes between which polarized pyroelectric material is positioned, each element being operative to produce a voltage proportional to the rate of change of infrared radiation incident thereon. The elements are closely spaced to one another and cover substantially all of at least one surface of the pyroelectric material. Multiple fields of view of areas under surveillance are fully covered (with negligibly small gaps). Alternate sensor elements are connected to a first amplifier channel and the other sensor elements are connected to a second amplifier channel. Coincidence means produces an alarm output in response to concurrent intruder signal generation by both of the amplifier channels.
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patent: 4296324 (1981-10-01), Kern et al.
patent: 4364030 (1982-12-01), Rossin
patent: 4384207 (1984-05-01), Doctor
Pittway Corporation
Swann III Glen R.
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