Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-09-19
1991-12-31
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
250554, 431 69, 431 79, G08B 1712
Patent
active
050775502
ABSTRACT:
The presence of a flame from a burner is determined by analyzing the signal produced by a radiation sensor aimed at a burner. Specifically, a Fourier transformation is applied to the signal producing amplitude values for a spectrum of component frequencies produced by changes in the power of the flame over time. A logarithmic value is derived for each of the amplitude values. The degree of linearity of the distribution of the component frequency logarithmic amplitude values provides an indication of the flame presence. Several parameters, including integrated linear error, linearity regression correlation and slope difference, provide an indication of the degree of linearity. A plurality of values for each of these parameters are produced during an interval of time. When a given percentage of the parameter values are above their respective thresholds the flame is determined to be present, whereas when another given percentage of the parameter values are below their respective threshold the flame is determined to be extinguished.
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Allen-Bradley Company Inc.
Swann III Glen R.
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