Smoke detecting apparatus utilizing light signal pulse widths

Details Smoke detecting apparatus utilizing light signal pulse widths Smoke detecting apparatus utilizing light signal pulse widths

1998-06-30

1999-07-13

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340628, 250574, G08B 1710

Patent

active

059232609

ABSTRACT:
The pulse width of a light reception pulse signal a from a light receiving device is detected, and the smoke density is detected based on a total pulse width of pulse widths per unit time period. Alternatively, the smoke density may be detected based on an integrated value of the light reception pulse signal a from the light receiving device per unit time period. Even if the flow rate of the sucked air is varied, the total light reception pulse width value per unit time period is not varied, so that the smoke density can be accurately detected.

REFERENCES:
patent: 4618853 (1986-10-01), Yuchi
patent: 5319575 (1994-06-01), Lilienfeld
patent: 5477218 (1995-12-01), Manmoto et al.
patent: 5576697 (1996-11-01), Nagashima et al.

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