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Noncontact Acoustical Techniques for Nondestructive Characterization of Materials and Structures

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Abstract

The Johns Hopkins University Center for Nondestructive Evaluation (CNDE) is an interdisciplinary cooperative center between the university, government, and industrial organizations dedicated to the development of more accurate and innovative methods for the nondestructive evaluation of materials and to the education of talented students. This paper will describe several innovative noncontact nondestructive materials characterization methods developed in the CNDE. Lasers, optical interferometers, electro-magnetic transducers, and air(gas)-coupled systems are used for noncontact generation and detection of ultrasonic waves to inspect art paintings, metals, wood, and composites. Optical detection of acoustic emission signals permits detection of surface displacements caused by acoustic emission events without any modification of the detected waveforms or frequency spectra.

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  1. Center for Nondestructive Evaluation, The Johns Hopkins University, Baltimore, USA

    R. E. Green Jr.

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  1. R. E. Green Jr.
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Green, R.E. Noncontact Acoustical Techniques for Nondestructive Characterization of Materials and Structures. International Applied Mechanics 38, 253–259 (2002). https://doi.org/10.1023/A:1016057725704

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