Recognition and processing of waveforms

Details Recognition and processing of waveforms Recognition and processing of waveforms

1989-10-12

1991-04-09

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250339, 340578, G01J 502

Patent

active

050067109

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.

REFERENCES:
patent: 3940753 (1976-02-01), Muller
patent: 4570157 (1986-02-01), Kodaira
patent: 4603255 (1986-07-01), Henry et al.

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