Smoke detector including ambient temperature compensation

Details Smoke detector including ambient temperature compensation Smoke detector including ambient temperature compensation

1994-03-29

1996-06-25

Swarthout, Brent A.

Communications: electrical

Condition responsive indicating system

Specific condition

340628, 340584, 374178, 250573, 250574, G08B 1700

Patent

active

055304338

ABSTRACT:
A smoke type fire detector accurately detects a smoke density even when an internal temperature thereof changes. An internal temperature detecting unit detects an ambient temperature at a light emitting element and a light receiving element. A correction coefficient having a value associated with the ambient temperature detected by the temperature detecting unit is used to correct an output level of the light receiving element.

REFERENCES:
patent: 3604957 (1971-09-01), Satula
patent: 3873857 (1975-03-01), Farrish
patent: 4249169 (1981-02-01), Malinowski
patent: 4266220 (1981-05-01), Malinowski
patent: 4321466 (1982-03-01), Mallory et al.
patent: 4420746 (1983-12-01), Malinowski
patent: 4484050 (1984-11-01), Horinouchi et al.
patent: 5254975 (1994-10-01), Torikoshi
patent: 5448224 (1995-09-01), Mochizuki
Patent Abstracts Of Japan, vol. 5, No. 32, (P-050), 27 Feb. 1981.
IBM Technical Disclosure Bulletin, vol. 21, No. 11 (Apr. 1979).

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