By Jean-Christophe Vali?re
This ebook issues the presentation of particle pace size for acoustics utilizing lasers, together with Laser Doppler Velocimetry (LDV or Anemometry (LDA)) and Particle Imagery Velocimetry (PIV).
The target is first to give the significance of measuring the acoustic speed, specifically while the acoustic equations are nonlinear in addition to characterizing the close to fields. despite the fact that, those purposes have to use non-invasive sensors. a few optical thoughts, first and foremost built for fluid mechanics, were tailored to the sphere of acoustics lately. This publication summarizes 15 years of study during this quarter, highlighting the advancements which have been made, fairly in sign processing, and exhibiting functions for which they've got confirmed to be a service of innovation.
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This publication matters the presentation of particle pace dimension for acoustics utilizing lasers, together with Laser Doppler Velocimetry (LDV or Anemometry (LDA)) and Particle Imagery Velocimetry (PIV). the target is first to provide the significance of measuring the acoustic pace, specially while the acoustic equations are nonlinear in addition to characterizing the close to fields.
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Extra info for Acoustic Particle Velocity Measurements Using Laser. Principles, Signal Processing and Applications
34] Correlation and covariance “measure” the statistical similarity of two random processes. They are identical obviously if the mean of both processes is zero. In case of the same random signal, two RVs can be formed from the times t1 and t2 with t1 ≠ t2. 36] If t1 = t1, the autocovariance, , is the variance of the process at the given time and is their second-order moment. 37] which “measures” the similarity of the two temporal fluctuations. 37]. 38] which measures self-similarity in one realization of a single process.
Our first objective in this book is to propose a large overview of the use of laser techniques for audible acoustics (not vibration which is another subject) whatever the end results. Neverthless, the publications concerning fluid velocity measurements have been deliberately discarded, even if the laser technique for estimating acoustic radiation from flows is a timely topic. The problem involved in this case is turbulence measurement, which is well documented in the literature. Nevertheless, readers will find useful information in this book for these last applications.
94, no. 1, pp. 54–65, 2008. , Conception d’un dispositif expérimental et étude de l’écoulement oscillant en résonateur acoustique fort niveau pour la caractérisation de phénomènes non-linéaires: transition à la turbulence et écoulements redressés, PhD Thesis, University of Poitiers, France, 2007. , “Systematic measurement errors with two microphone sound intensity meters”, Journal of Sound and Vibration, vol. 83, no. 1, pp. 53–65, 1982. , An Introduction to Acoustics, Lecture Notes, Eindhoven University of Technology, 2003.