Development of ultrasonic velocity-profiler system combining pulse-doppler and cross correlation techniques

Hajime Inoue, Michitsugu Mori, Koichi Hishida, Masanobu Maeda

Research output: Contribution to journalArticlepeer-review

Abstract

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 10 ms, 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 500 μs 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.

Original languageEnglish
Pages (from-to)3196-3203
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume70
Issue number700
DOIs
Publication statusPublished - 2004 Dec

Keywords

  • Cross Correlation
  • Signal Processing
  • Time Resolution
  • Ultrasonic
  • Velocity Measurement

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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