| 摘要 |
A system which processes the output of a flame sensor in a combustion burner to extract signals characteristic of burner operation. These signals include signals charateristic of flame stability as well as signals characteristic of combustion quality. The flame sensor detects flame radiation from a combustion apparatus to sense a desired flame characteristic, for example NOx. The sensor produces an electric signal indicative of the detected radiation. The signal is converted, via dynamic signal processing, into a function having a (preferably single) maximum or minimum in a range of interest - generically called an extremum function with an extremum point the magnitude and location of which float in the frquency domain. Preferably, the extremum (i.e., the magnitude of the function at the minimum or maximum), and the frequency location of the extremum, is set up or adjusted to match burner operating conditions. Using this function as a basis, the signal is divided into frequency segments and dynamically normalized; the resulting freqency-limited signals characterize the large-scale and the small-scale turbulence zones in the frequency domain. The flame characteristics are determined by evaluating one or more selected statistical parameters of the curve derived from the signals in selected frequency segments, along with one or more limiting conditions such as the degrees of scattering (i.e., standard deviation) of those or other parameters.
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