Research on the On-Line and Real Time Microprocessor -Based Cross Correlator for Two-Phase Flow Rate Measurement

摘要

In general, a correlator based on a microprocessor is no good for a real time application. In this paper, a fast polarity correlation algorithm is presented which utilizes the functions of a standard 8-bit microprocessor to handle 8-bit data simultaneously and to look up a table. The peak of a correlation function is searched by scanning and bisection method. When it is programmed on a Z8671 single-chip microcomputer at 7.3728MHZ, this algorithm allows a maximum sampling frequence of 18.08KHZ, and for a measurement window of 127 points with 256 integrated points, after collecting data only 10ms is required to give out the transit time over distance. L. Therefor it is possibl to make a correlator based on a microprocessor for real time application.