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Title: Gas coupled laser acoustic detection for ultrasound inspection of composite materials

Abstract

A novel laser based technique for the detection of ultrasound radiated from solid materials has been developed. In this approach, a probe beam is directed parallel to the surface of a sample. Ultrasonic waves in the solid are detected when an acoustic wave is radiated from the surface into the ambient air, where the density variations cause a beam deflection. Because the laser beam is not reflected from the sample surface, the technique is not dependent upon the surface optical properties of the material under investigation. It is particularly useful for testing graphite/polymer composites and other materials with poorly reflecting surfaces. Gas coupled laser acoustic detection (GCLAD) has been used to record well through transmission and surface acoustic waveforms in various materials. GCLAD has also been incorporated into a C-scanning system where it has been used to image subsurface discontinuities in graphite/polymer composite panels. Recent studies have investigated the inspection of curved surfaces. To this end, the flanges and corner of an angled graphite reinforced composite panel were scanned using this technique. In addition, the prospect of using surface acoustic waves (SAWs) for the interrogation of the skins on multi-layer materials has also been studied. Using GCLAD, Lamb, and Rayleighmore » waves have been detected in composites, polymers, thin metal films, and metal plates.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Research Support Instruments, Lanham, MD (US)
OSTI Identifier:
20030393
Alternate Identifier(s):
OSTI ID: 20030393
Resource Type:
Journal Article
Journal Name:
Materials Evaluation
Additional Journal Information:
Journal Volume: 58; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0025-5327
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; COMPOSITE MATERIALS; ULTRASONIC TESTING; LASER RADIATION; ULTRASONIC WAVES

Citation Formats

Caron, J.N., Steiner, K.V., Yang, Y., and Mehl, J.B. Gas coupled laser acoustic detection for ultrasound inspection of composite materials. United States: N. p., 2000. Web.
Caron, J.N., Steiner, K.V., Yang, Y., & Mehl, J.B. Gas coupled laser acoustic detection for ultrasound inspection of composite materials. United States.
Caron, J.N., Steiner, K.V., Yang, Y., and Mehl, J.B. Mon . "Gas coupled laser acoustic detection for ultrasound inspection of composite materials". United States.
@article{osti_20030393,
title = {Gas coupled laser acoustic detection for ultrasound inspection of composite materials},
author = {Caron, J.N. and Steiner, K.V. and Yang, Y. and Mehl, J.B.},
abstractNote = {A novel laser based technique for the detection of ultrasound radiated from solid materials has been developed. In this approach, a probe beam is directed parallel to the surface of a sample. Ultrasonic waves in the solid are detected when an acoustic wave is radiated from the surface into the ambient air, where the density variations cause a beam deflection. Because the laser beam is not reflected from the sample surface, the technique is not dependent upon the surface optical properties of the material under investigation. It is particularly useful for testing graphite/polymer composites and other materials with poorly reflecting surfaces. Gas coupled laser acoustic detection (GCLAD) has been used to record well through transmission and surface acoustic waveforms in various materials. GCLAD has also been incorporated into a C-scanning system where it has been used to image subsurface discontinuities in graphite/polymer composite panels. Recent studies have investigated the inspection of curved surfaces. To this end, the flanges and corner of an angled graphite reinforced composite panel were scanned using this technique. In addition, the prospect of using surface acoustic waves (SAWs) for the interrogation of the skins on multi-layer materials has also been studied. Using GCLAD, Lamb, and Rayleigh waves have been detected in composites, polymers, thin metal films, and metal plates.},
doi = {},
journal = {Materials Evaluation},
issn = {0025-5327},
number = 5,
volume = 58,
place = {United States},
year = {2000},
month = {5}
}