Smoke detector

Details Smoke detector Smoke detector

G - Physics

08

B

340/140.1

G08B 17/10 (2006.01) G08B 17/107 (2006.01)

Patent

CA 1129034

6488 INVENTOR: ERWIN TRESCH CAN INVENTION: SMOKE DETECTOR ABSTRACT OF THE DISCLOSURE A smoke detector containing a radiation source operating in a pulsed mode and a scattered radiation re- ceiver connected in a coincidence circuit. This circuit contains a counter which counts both the radiation pulses and the incoming scattered radiation pulses. With undis- turbed operation this counter, following each radiation pulse, has an even numbered counter state. The appearance of an uneven numbered counter state is indicative of the presence of spurious pulses and leads to resetting of the counter to null, so that there is prevented attainment of a counter state adequate for tripping an alarm signal. On the other hand, with the presence of a predetermined even numbered counter state there is triggered an alarm. Such smoke detector is almost immune to spurious pulses and does not tend to trigger faulty alarm signals. Its operational reliability is appreciably improved. It is especially suitable for use as a fire alarm or detector.

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