(College of Electrical and Electronic Engineering,,North China Electric Power University,Baoding 071000,,China)
Abstract: To obtain the two-dimensional velocity distribution at the shallow or cross-section of the water and expand the application range of ultrasonic measurement, a two-dimensional side-looking acoustic Doppler velocimeter was designed. A 5 MHz high-frequency ultrasonic wave was used for measurement, and a unique probe structure was designed to avoid interference to the measuring flow field. Based on the basic principle of the Doppler effect, the complex autocorrelation algorithm was used to estimate the frequency, and the radial velocity of ultrasonic transducer was calculated. The two-dimensional velocity was obtained through the transformation matrix. The experimental results show that the designed two-dimensional side-looking acoustic Doppler velocimeter can effectively measure the two-dimensional velocity of the sample with the standard deviation of 0.047 m/s and 0.009 m/s respectively, which has certain practical value.
Key words : Doppler velocimeter,;two-dimensional velocity;complex autocorrelation