Journal ArticleDOI
Effect of Doppler ambiguity on the measurement of turbulence spectra by laser Doppler velocimeter
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TLDR
In this paper, the effect of finite transit times of scatterers to cross the scattering region in a laser Doppler velocimeter is discussed, and it is shown that in the measurement of the velocity spectrum, it is equivalent to white spectrum noise with an amplitude inversely proportional to the average transit time.Abstract:
For the measurement of turbulent flows, the effect of finite transit times of scatterers to cross the scattering region in a laser Doppler velocimeter is discussed. The result shows that in the measurement of the velocity spectrum, it is equivalent to a white spectrum noise with an amplitude inversely proportional to the average transit time. Theoretically, the noise becomes negligibly small when the wavelength of the laser light becomes very short.read more
Citations
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Slurry Atomization dc Plasma Emission Spectrometry and Laser Diffraction Studies of Aerosol Production and Transport
TL;DR: In this article, a clog-free Babington slurry nebulizer system for direct current plasma (DCP) emission spectrometry is presented, and the effects of Babington gas orifice diameter, argon flow rate, and sample consumption rate are studied.
Journal ArticleDOI
Laser Doppler velocimeter with optical frequency shifting
TL;DR: In this article, a bi-directional laser Doppler velocimeter utilizing optical frequency shifting has been developed for velocity measurements in reversing flows, highly turbulent flows, two-phase flows, and boundary layers.
Journal ArticleDOI
Submicron Particle Size Measurements in an Acetylene-Oxygen Flame
TL;DR: In this article, the authors used diffusion broadening spectroscopy to make in situ size measurements of submicron aerosol particles in an acetylene-oxygen flame, making use of the spectral broadening of scattered laser light due to random particle motion.
Journal ArticleDOI
Doppler ambiguity in laser Doppler velocimeters
W. K. George,N. S. Berman +1 more
TL;DR: In this paper, an analysis of the Doppler ambiguity for the laser DoP velocimeter is presented which accounts for the signal statistics based on a Gaussian beam intensity.
References
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Journal ArticleDOI
Turbulent Flow Measurements Utilizing the Doppler Shift of Scattered Laser Radiation
R. J. Goldstein,W. F. Hagen +1 more
TL;DR: In this article, the mean turbulent velocity and intensity of turbulence in a duct flow were derived from the frequency shift of laser illumination scattered by small particles contained in the flow, and the probability function for the turbulent velocity in the duct flow was determined from the laser illumination.
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Measurement of turbulent velocities from the Doppler shift in scattered laser light
TL;DR: In this article, the Doppler shifts in the frequency of laser light scattered by small particles in the water were measured using an optical hetrodyne technique to measure the shift in frequencies.
Journal ArticleDOI
A unified analysis on laser Doppler velocimeters
TL;DR: In this article, a unified analysis on various optical arrangements of laser Doppler velocimeter, such as local-oscillator heterodyne differential heterodynes and symmetric heterodyns, is given.
Journal ArticleDOI
Instantaneous Turbulence Velocity Measurement by Laser Doppler Velocimeter
TL;DR: In this article, a frequency-modulation (FM) demodulation scheme for the measurement of instantaneous velocity of turbulent flow by laser Doppler velocimeter is proposed, and an analysis based on the theory of optical mixing spectroscopy is given.
Journal ArticleDOI
New model for laser doppler velocity measurement on turbulent flow
TL;DR: Using the theory of optical mixing spectroscopy, a new model was proposed for the laser Doppler velocity measurement on both laminar and turbulent flow, and a system using two incident light beams was described as mentioned in this paper.