Simultaneous Measurement of Volocity and Size of Flowing Particles: (Detection of Phase Shift of Doppler Signals by Fast Digital Processor)

Koichi Hishida, Kazuhiro Kobashi, Naritoshi Sanai, Masanobu Maeda

Research output: Contribution to journalArticlepeer-review

Abstract

The present processing system was designed to measure size and velocity of particles in dense two-phase flows. A fast Fourier transform method was adopted to detect not only Doppler frequencies but also phase shifts of Doppler signals, where a particle size was proportional to the phase difference of Doppler signals observed by photodetectors at different positions. A fast digital signal processor was employed for the high speed calculation of FFT processing. The transmitting and receiving optical systems of the present LDV was constructed by fiber optics to stabilize and compact it. The present system provided a high accuracy in measurements of particle velocity and size for noisy signals.

Original languageEnglish
Pages (from-to)80-85
Number of pages6
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Volume55
Issue number509
DOIs
Publication statusPublished - 1989

Keywords

  • Digital Signal Processor
  • Flow Measurements
  • Laser Velocimetry
  • Multiphase Flow
  • Optical Measurements
  • Particle Sizing

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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