Improved pollution detection apparatus
Number of patents in Portfolio can not be more than 2000
United States of America
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-
Aug 23, 1994
Grant Date -
N/A
app pub date -
Jun 2, 1989
filing date -
Oct 21, 1983
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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