Review of LDA and PIV applied to the measurement of sound and acoustic streaming

✍ Scribed by M. Campbell; J.A. Cosgrove; C.A. Greated; S. Jack; D. Rockliff

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 374 KB
• Volume: 32
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/s0030-3992(00)00091-8

✦ Synopsis

A review of laser Doppler anemometry (LDA) and particle image velocimetry (PIV) with their application to the measurement of sound is presented. The fundamental principles behind LDA and PIV are discussed and extended to the application of sound measurement. Special attention is paid to analysis of LDA signals including the Hilbert transform, which enables amplitude information to be obtained about various frequency components of a signal and wavelet analysis, which allows non-stationary signals to be accurately analysed. The in uence of the refractive index variations in a medium due to a sound wave on the laser beams of an LDA signal is discussed. Attention is also paid to acoustic streaming which arises due to high-intensity sound, and PIV results are presented to demonstrate the e ect.