Adjustment and evaluation of an LDA probe for accurate flow measurement

Cheng Tsair Yang, Meng Chai Wu, Han-Sheng Chuang

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

An LDA probe with optimized measuring volume was obtained based on repeated adjustments of a preconfigured LDA system with a calibrated spinning disc. A retriggerable pulse-width-and-time-delay module was used to trigger and freeze favorable Doppler bursts. After a repeated beam-steering procedure and a fringe-pattern analysis, we found that the variation of fringe spacing throughout the measuring volume was reduced from 3% to 0.28%, such that the adjusted probe gave more accurate measurements. To verify this applicability in velocity calibration, the fringe spacing of the adjusted LDA measuring volume was treated as a velocity coefficient, and its mean and measurement uncertainty was experimentally estimated. Analysis shows that the expanded uncertainty of the coefficient was 0.10% at the 95% level of confidence for both the components of the LDA. The results demonstrated that the adjusted LDA system was qualified to perform accurate flow measurement.

Original languageEnglish
Pages (from-to)291-304
Number of pages14
JournalOptics and Lasers in Engineering
Volume38
Issue number5
DOIs
Publication statusPublished - 2002 Nov 1

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flow measurement
Flow measurement
adjusting
evaluation
probes
Time delay
Calibration
spacing
beam steering
coefficients
metal spinning
confidence
bursts
pulse duration
time lag
diffraction patterns
modules
actuators
Uncertainty

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Mechanical Engineering
  • Electrical and Electronic Engineering

Cite this

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abstract = "An LDA probe with optimized measuring volume was obtained based on repeated adjustments of a preconfigured LDA system with a calibrated spinning disc. A retriggerable pulse-width-and-time-delay module was used to trigger and freeze favorable Doppler bursts. After a repeated beam-steering procedure and a fringe-pattern analysis, we found that the variation of fringe spacing throughout the measuring volume was reduced from 3{\%} to 0.28{\%}, such that the adjusted probe gave more accurate measurements. To verify this applicability in velocity calibration, the fringe spacing of the adjusted LDA measuring volume was treated as a velocity coefficient, and its mean and measurement uncertainty was experimentally estimated. Analysis shows that the expanded uncertainty of the coefficient was 0.10{\%} at the 95{\%} level of confidence for both the components of the LDA. The results demonstrated that the adjusted LDA system was qualified to perform accurate flow measurement.",
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Adjustment and evaluation of an LDA probe for accurate flow measurement. / Yang, Cheng Tsair; Wu, Meng Chai; Chuang, Han-Sheng.

In: Optics and Lasers in Engineering, Vol. 38, No. 5, 01.11.2002, p. 291-304.

Research output: Contribution to journalArticle

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