Photoelectric smoke detector and disaster monitoring system usin

Details Photoelectric smoke detector and disaster monitoring system usin Photoelectric smoke detector and disaster monitoring system usin

1996-07-19

1999-01-12

Font, Frank G.

Optics: measuring and testing

By configuration comparison

With comparison to master, desired shape, or reference voltage

356438, 250574, G01B 1100, G01N 2100, G01N 1506

Patent

active

058597069

ABSTRACT:
A drive pulse for emitting and turning-off a light emitting element is output, the level difference or the level ratio between the light emission zero point detection signal from a light receiving element having received the light from the light emitting element and a putting-off zero point detection signal from the light receiving element when the light emitting element is put off is calculated, and the level difference or the level ratio is compared with a preset level to thereby determine the abnormality of the light emitting element, the light receiving element and a peripheral circuit. With this arrangement, even if the ratio of noise light occupied in the zero point output is reduced, whether detecting elements and the peripheral circuit are good or bad and whether the elements are abnormally polluted or not can be reliably tested without the effect of the dispersion of the detecting elements and the change of an ambient temperature, whereby the reliability of a smoke detector is improved.

REFERENCES:
patent: 4317113 (1982-02-01), Honma
patent: 5497009 (1996-03-01), Torikoshi et al.
patent: 5532472 (1996-07-01), Furuta
patent: 5552765 (1996-09-01), Vane et al.
patent: 5576697 (1996-11-01), Nagashima et al.

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