G - Physics
08
B
340/124.4
G08B 13/00 (2006.01) G08B 13/194 (2006.01)
Patent
CA 1086399
ABSTRACT OF THE DISCLOSURE The invention relates to apparatus for detection of variations in the radiation pattern from a defined space. The apparatus may serve as an intrusion detector and alarm, which senses the presence of an intruder by monitoring light intensity variations in the field of scan. Or it may serve as a fire detector by sensing infrared radiation. One embodiment comprises a rotating mirror, radiation detector, analog-digital converter for deriving a series of digital values for the scanning positions of a complete scan, a memory for storing the digital values for at least one complete scan, and a comparator for comparing incoming digital values with stored digital values for the set of scanning positions. The comparator determines if the incoming value differs from the stored value by more than a predetermined amount. If it does an alarm is actuated and the stored value is retained in the memory. If it does not, the incoming value is stored in the memory and the alarm is not actuated. Scanning may also be effected by a single line electronic scan- ning device without any mechanical movement.
277234
Her Majesty The Queen In Right Of Canada As Represented By The M
Smart & Biggar
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