Recognition and processing of waveforms
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United States of America Patent
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-
Apr 9, 1991
Grant Date -
N/A
app pub date -
Oct 12, 1989
filing date -
Oct 12, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A flame detector has a sensor for producing a digital waveform representing a flickering flame. Its turning points are detected and the magnitudes between successive such points are measured. The value of each such magnitude is plotted on a graph whose horizontal axis represents the current value and whose vertical axis represents the immediately preceding value. Points are produced lying in regions away from the diagonal and from the axes. If the detected waveform originates from a regularly varying interfering source, the corresponding points will lie on or near the diagonal. If the interfering source is a waveform undergoing step changes, the corresponding points will lie adjacent to the axes. In this way, discrimination between flames and interfering sources of radiation can be made.
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