Smoke sensor and monitor control system

Details Smoke sensor and monitor control system Smoke sensor and monitor control system

1998-04-29

2000-01-04

Lefkowitz, Edward

Communications: electrical

Condition responsive indicating system

Specific condition

250574, G08B 1710

Patent

active

060114789

ABSTRACT:
A smoke sensor includes a light receiving unit for temporally alternately receiving scattered light of two different wavelengths .lambda..sub.1 and .lambda..sub.2 ; a calculating unit for performing a calculation required for smoke detection, on a scattered light output y of the wavelength .lambda..sub.1 and a scattered light output g of the wavelength .lambda..sub.2 from the light receiving unit; and a smoke detection processing unit for performing a smoke detection process on the basis of a calculation result output from the calculating unit. The calculating unit estimates an output value of one of the scattered light output y of the wavelength .lambda..sub.1 and the scattered light output g of the wavelength .lambda..sub.2 at a sample timing of the other output, and obtains a ratio of the estimated output value of the one scattered light at the sample timing of the other output to an output value of the other scattered light, as a two-wavelength ratio.

REFERENCES:
patent: 5502434 (1926-03-01), Minowa et al.
patent: 5576697 (1996-11-01), Nagashima et al.
patent: 5751216 (1998-05-01), Narumiya
patent: 5898377 (1999-04-01), Adachi et al.

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