G - Physics – 08 – B
Patent
G - Physics
08
B
340/102
G08B 19/00 (2006.01)
Patent
CA 1064594
FIRE AND INTRUDER DETECTION AND ALARM APPARATUS ABSTRACT OF THE DISCLOSURE Improved apparatus is provided for monitoring a space under surveillance, for detecting the existence of a fire, the presence of an intruder or the occurrence of other abnormal con- ditions, and for providing a warning signal for actuating an alarm or the like in response thereto. The apparatus employs a plurality of sensors which respond by changes in the electrical characteristics thereof to the level of infrared, light or other radiations from the monitored space respectively sensed thereby. The apparatus significantly provides means for rendering the in- dividual sensors directionally responsive to radiations from respectively corresponding portions of the space being monitored, for employing such sensors as output-affecting elements in more than a single arm of an electrical bridge circuit, for employing such sensors when desired in a plurality of operationally related electrical bridge circuits, for employing capacitative coupling between the output of a sensor-controlled bridge circuit and a differential amplifier to "mask" very slow changes in the output of the bridge circuit due to normal ambient variations while re- taining high sensitivity in responding to more rapid changes of such output typical of fire, intruder or other abnormal condi- tions requiring alarm actuation, for employing such differential amplifier for converting changes in capacitatively coupled output from a sensor-controlled bridge circuit into direct current sig- nals of polarity dependent upon the direction of change in such bridge circuit output, and for employing bridge type rectification for converting signals of either polarity from such differential amplifier into control signals of a single polarity for actuating an alarm activating switching component.
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