Photoelectric synchronous smoke sensor

Details Photoelectric synchronous smoke sensor Photoelectric synchronous smoke sensor

1978-06-29

1980-04-15

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250574, 340636, G08B 1710

Patent

active

041986270

ABSTRACT:
In a photoelectric synchronous smoke sensor of the type wherein an electric power consumption is reduced by sample-detecting the smoke while bringing both light-emitting section and light-receiving section in the actuated state in synchronism with each other, a photoelectric synchronous smoke sensor characterized in that said light-emitting section is actuated by a pulse of a narrow pulse width and said light-receiving section by a pulse of a wide pulse width, and an input signal is applied to a synchronism detector only within the time width of said pulse of a narrow pulse width in order to increase sensitivity, to stabilize performance and at the same time, to automatically supervise a power source voltage.

REFERENCES:
patent: 3316410 (1967-04-01), Meili et al.
patent: 3543260 (1970-11-01), Engh
patent: 3887815 (1975-06-01), Kawakami
patent: 3917956 (1975-11-01), Malinowski
patent: 3924252 (1975-12-01), Duston
patent: 3946241 (1976-03-01), Malinowski
patent: 4063227 (1977-12-01), Peterson
patent: 4065759 (1977-12-01), Handing
patent: 4087799 (1978-05-01), Brouwer
patent: 4125779 (1978-11-01), Malinowski

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