Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1994-12-13
1996-01-23
Kostak, Victor R.
Communications: electrical
Condition responsive indicating system
With particular system function
340556, 340567, 340578, G08B 1900, G08B 1318, G08B 1712
Patent
active
054868106
ABSTRACT:
A integrated IR detector for detecting both motion and fire/smoke includes in one embodiment a single source of IR radiation and separate IR sensors for sensing motion and smoke. The separate sensors are coupled by their outputs to separate amplifier circuits and provide separate outputs indicating motion (intrusion) detection and smoke detection. The entire arrangement of IR source and dual sensors are mounted in a single housing and powered by a common power supply. In a second embodiment, a single passive IR motion detector having a pair of phase opposed series connected sensors is coupled to a circuit for detecting motion (intrusion) while one of the pair of sensors is coupled to a circuit for sensing changes in ambient temperature. The circuit for detecting ambient temperature changes includes logic analysis and time constant filtering to produce an alarm signal only when ambient temperature changes exceed a preset threshold rate of degrees per second. Common power supplies and control units are disclosed which allow coupling alarm signals on a single two-wire or four-wire circuit.
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Gordon David P.
Kostak Victor R.
Miller John W.
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