应用极性相关技术在线测量高温烟气流动速度

On line Measurement of High temperature Gas Flow Speed through the Use of Polarity Correlation Techniques

应用单片微机ＭＣＳ５１系列及自行开发的扩展系统（包括软件部分）研制的测量系统，成功地对管道内高温烟气流速进行了在线测量。该系统采用新颖的过零时刻采样法和过零时刻算法对烟气流动噪声信号作极性相关处理，快速搜寻峰值对应的时延值，并据此求得测量速度。试验表明，测量技术具有测量精度高，测量时间短，且可靠性强，适于工业现场进行在线测量。

By the use of a measurement system based on a single chip microcomputer MCS 51 series and self developed expansion system (including software) conducted is a successful on line measurement of high temperature gas flow speed in a piping. With the help of a novel zero cross time sampling method and zero cross time algorithm the above cited system underwent a polarity correlation treatment of the gas flow noise signal. A rapid search of a timede lay value corresponding to a peak value was conducted and on this basis a measurement speed obtained. The tests show that the measurement technique features high precision, short measurement time and high reliability, thus making it suitable for industrial site on line measurement.