Time-difference Ultrasonic Wind Detection Methods Based on Cross-correlation Theory

A time-difference ultrasonic wind speed and direction detection method is introduced. The two transducers are operated on unilateral V-mode. After the up-stream and down-stream echo signal being sampled, interpolated and cross-correlated, the time-difference of the echo signal is gained in accordance with the peak of the echo signals cross-correlated function. Through the time-difference, the wind speed and direction can be measured indirectly. The time-resolution of the echo signal is improved and the measure of the minuteness time-difference is realized by the data interpolation. The Wavelet Transform and Temperature Compensation are used to depress the environment noise and revise the error of the velocity of sound. The high detection precision and good statistic characters of the system had been proved with the experiment.