Location

Brunswick, ME

Start Date

1-1-1997 12:00 AM

Description

Acousto-optical measurement inside transparent media is a well known non invasive method for acoustic fields probing. The optical index variations induced by acoustic wave propagation in a liquid or transparent solid can be detected using several techniques: optical deflection, diffraction methods, etc ... Last year, X. Jia, G. Quentin and Laszlo Adler [1] described the ability of a interferometric detection technique to provide local and quantitative measurements of pressure fields in water as well as dilatational fields inside transparent solids. This method combines the acousto-optical effect with heterodyne interferometry. It measures the phase shift of a laser beam passing through an ultrasonic wave. The interferometric detection provides a local measurement and is sensitive not only to the amplitude but also to the phase of the acoustic wave. Finite amplitude waves in liquid, [1], bulk waves in solids [1] as well as guided waves (Rayleigh waves [2], Lamb waves [3] and Interface waves[4]) has been successfully detected using this method.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

16A

Chapter

Chapter 2: Emerging Inspection Technologies

Section

Laser Based Ultrasonics

Pages

587-592

DOI

10.1007/978-1-4615-5947-4_77

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Ultrasonic Field Reconstruction from Optical Interferometric Measurements

Brunswick, ME

Acousto-optical measurement inside transparent media is a well known non invasive method for acoustic fields probing. The optical index variations induced by acoustic wave propagation in a liquid or transparent solid can be detected using several techniques: optical deflection, diffraction methods, etc ... Last year, X. Jia, G. Quentin and Laszlo Adler [1] described the ability of a interferometric detection technique to provide local and quantitative measurements of pressure fields in water as well as dilatational fields inside transparent solids. This method combines the acousto-optical effect with heterodyne interferometry. It measures the phase shift of a laser beam passing through an ultrasonic wave. The interferometric detection provides a local measurement and is sensitive not only to the amplitude but also to the phase of the acoustic wave. Finite amplitude waves in liquid, [1], bulk waves in solids [1] as well as guided waves (Rayleigh waves [2], Lamb waves [3] and Interface waves[4]) has been successfully detected using this method.