Download PDF by Jean-Christophe Vali?re: Acoustic Particle Velocity Measurements Using Laser.

By Jean-Christophe Vali?re

ISBN-10: 1118649354

ISBN-13: 9781118649350

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 aim is first to give the significance of measuring the acoustic pace, in particular whilst the acoustic equations are nonlinear in addition to characterizing the close to fields. even though, those purposes have to use non-invasive sensors. a few optical thoughts, first and foremost built for fluid mechanics, were tailored to the sector of acoustics in recent times. This ebook summarizes 15 years of analysis during this sector, highlighting the advancements which were made, relatively in sign processing, and exhibiting purposes for which they've got confirmed to be a service of innovation.

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Additional resources for Acoustic Particle Velocity Measurements Using Laser. Principles, Signal Processing and Applications

Sample text

It could have a very complex behavior such as vortex shedding or turbulence as seen in Chapter 1. As we will see later, the optical methods for measuring the acoustic velocities require an estimation of the acoustic displacement. 16] The relative magnitude of the three terms preconditions the strategy of measurement. As an example, if the flow displacement, dm, is much higher than the magnitude of acoustic displacement, the capability of detection of the fluctuation will decrease. 2. 1. Fourier transform We now assume to have only one realization of a process.

33] where vn is the surface normal velocity in the direction of the external normal of the element of the surface [DOW 83]. We should note that the impedance depends on frequency and is generally measured with adapted setup (Kundt’s tube for example). 2. 34] This means that the knowledge of the pressure gradient is theoretically sufficient to solve a border problem. Practically, this is not so simple and this pressure gradient has to be estimated using a finite number of pressure captions, as we will see later [ALL 09].

Furthermore, it is generally too simple to reduce the asynchronous velocity vb as a noise. It could have a very complex behavior such as vortex shedding or turbulence as seen in Chapter 1. As we will see later, the optical methods for measuring the acoustic velocities require an estimation of the acoustic displacement. 16] The relative magnitude of the three terms preconditions the strategy of measurement. As an example, if the flow displacement, dm, is much higher than the magnitude of acoustic displacement, the capability of detection of the fluctuation will decrease.

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Acoustic Particle Velocity Measurements Using Laser. Principles, Signal Processing and Applications by Jean-Christophe Vali?re


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