Communications: electrical – Condition responsive indicating system – Specific condition
Patent
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
Myer Daniel
Rowland James L.
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