日本機械学会論文集B編
Online ISSN : 1884-8346
ISSN-L : 1884-8346
一般論文
超音波パルスドップラ法におけるパルスの繰り返し回数とノイズによる速度分布計測への影響
村川 英樹大上 陽杉本 勝美竹中 信幸
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ジャーナル フリー

2013 年 79 巻 799 号 p. 356-367

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Ultrasonic pulse Doppler method has been widely used in many engineering field referred to as UVP (ultrasonic velocity profiler). Analysis algorithm in the UVP, number of pulse repetition (Npulse), noise and reflector conditions, etc. may affect on the measurement accuracy. The Npulse is related to the temporal resolution, and must be set as low as possible in order to improve the temporal resolution. However, it is known that accuracy of instantaneous velocity becomes worse with decreasing of the Npulse. In this study, effect of analysis algorithm in the UVP on velocity data was investigated with changing of the Npulse and SNR by simulation and experiments. As a result, it is shown that there is an appropriate Npulse in each algorithm depending on the SNR. An algorithm which decides the Doppler frequency from maximum value in the power spectrum, FFT-max, was relatively hard to be affected by noise. Difference of velocity standard deviation was small between lower and higher noise conditions when FFT-max with Npulse over the appropriate value was used for the calculation. Hence, FFT-max was the best analysis algorithm for measuring flow field compared with the autocorrelation.

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© 2013 一般社団法人 日本機械学会
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