Evaluation of Fiber-Reinforced Composites Using a Non-Contact Laser/Air-Transducer System

Date
1995
Authors
Wright, W.
Hutchins, D.
Gachagan, A.
Hayward, G.
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Altmetrics
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Research Projects
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Abstract

Ultrasonic evaluation of materials using a non-contact system is sometimes desirable, for example when the material is moving too quickly to allow conventional fluid couplants to be used, is contained in a hostile environment, or the material itself is absorbent or toxic. In such situations, a pulsed laser is ideal for generating a variety of ultrasonic transients [1], as longitudinal, shear, surface (Rayleigh) waves and plate (Lamb) waves are generated simultaneously. Several types of non-contact detector are also available, including various optical devices [2] such as interferometers and beam deflectors. The disadvantages of an entirely laser based system are cost, and the optical quality of the test material must be reasonably high.

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