抄録
Acoustic gas temperature measurement using sound speed, which has merits of non-contact and long time observation, is a desired technique in controlling boilers which are to cope with various burning profiles of fuels. In order to identify the time-of-flight of acoustic testing signals on applying the measurement, a signal processing method based on the matched filtering with the pre-whitening for noises in the boiler furnaces achieves a good performance. Furthermore, the phase reversal keying of the M-sequence is suitable for the testing signals which are sent into the furnaces on this method. In this report, the optimal signal processing method, and the appropriate conditions of the testing signal are discussed. In addition, studies on the performance and the practicality of not only the processing method but also the testing signal at a boiler of a commercial power plant are also introduced.
