ドップラー法および相互相関法を併用した超音波流速分布計測システムの開発(熱工学,内燃機関,動力など)

概要

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Measurement techniques for turbulence flow by high time resolution have been developed using Ultrasonic Velocity Profiling technique. The signal processing algorithm affects the time resolution whose maximum of a conventional Ultrasonic Velocity Profiler (UVP) based on the pulse-Doppler signal is on the order of 10ms, which is insufficient for the investigation of turbulence characteristics. We used a cross correlation technique to estimate a time difference between paired echo signals of ultrasound pulses emissions to improve the time resolution of the UVP. This technique is susceptible to noise, so that the frequently signals of velocity information may hardly be detected out of measured signals especially in such as metal pipes. To solve this issue, a novel signal processing technique by combining the pulsed-Doppler and the cross-correlation techniques has been developed, in which the maximum time resolution attained to be less than 500μs and robustness against noise. The deviation of the measured mean velocity between this novel UVP and existing LDV is within 0.1% even in stainless pipe.
社団法人日本機械学会の論文
2004-12-25