Smoke detection apparatus

Details Smoke detection apparatus Smoke detection apparatus

1984-10-22

1987-06-02

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

250573, 250575, 340753, G08B 1710

Patent

active

046707417

ABSTRACT:
In a smoke detection system, smoke density in a sampling chamber is measured by flashing a strobe light through the chamber and sensing light flux emitted from the chamber and comparing it with light flux from the strobe light itself. The measurements are performed by peak detectors which load sample-and-hold circuits to provide steady signals. The two signals are combined in mathematical manner to compensate for zero-offset and rate error between the two signals. The combined and corrected output is used to actuate a visual alarm signal, such as a segmented bargraph display to indicate air pollution. The bargraph has programming pins for tapping off each individual bargraph segment to achieve plural preset alarm thresholds.

REFERENCES:
patent: 513829 (1894-01-01), Schureman
patent: 2867698 (1959-01-01), Gondolfo
patent: 3684870 (1972-08-01), Nelson
patent: 3824402 (1974-07-01), Mullaney et al.
patent: 4464656 (1984-08-01), Nakamura

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