Simultaneous measurement of velocity 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 journalArticle

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
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume55
Issue number509
Publication statusPublished - 1989 Jan
Externally publishedYes

Fingerprint

Phase shift
Fast Fourier transforms
central processing units
phase shift
Digital signal processors
Processing
Photodetectors
Two phase flow
Optical systems
Fiber optics
Particle size
fast Fourier transformations
two phase flow
photometers
fiber optics
high speed

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Simultaneous measurement of velocity and size of flowing particles (detection of phase shift of Doppler signals by fast digital processor). / Hishida, Koichi; Kobashi, Kazuhiro; Sanai, Naritoshi; Maeda, Masanobu.

In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 55, No. 509, 01.1989, p. 80-85.

Research output: Contribution to journalArticle

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