Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1997-09-30
1999-02-09
Mullen, Jr., Thomas J.
Communications: electrical
Condition responsive indicating system
Specific condition
340511, 340522, G08B 1318
Patent
active
058700226
ABSTRACT:
A detection system and method are capable of reducing the occurrence of false alarms and detection failures by compensating for variations in the amplitude of a detection signal generated by a PIR sensor. An adaptive threshold can be used that varies according to ambient temperature of the detection area and the frequency of the detection signal. Comparison of the detection signal to the adaptive threshold allows compensation for temperature- and/or frequency-induced variations in detection signal amplitude. The adaptive threshold can be configured for standard detection area conditions or calibrated for conditions at the installation site. Relative measurement and adaptive sampling techniques also can be used to compensate for the presence of low frequency shifts in the detection signal. Such techniques can provide an accurate representation of signal amplitude relative to a threshold amplitude despite differences in absolute signal magnitude. The use of an adaptive sampling rate that increases with the onset of a potential intruder event contributes to power conservation in the detector.
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Kuhnly Keith D.
Saldin Paul G.
Interactive Technologies Inc.
Mullen Jr. Thomas J.
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