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Laser generated ultrasound: efficiency and damage thresholds in carbon fibre reinforced composites
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UNSPECIFIED (2001) Laser generated ultrasound: efficiency and damage thresholds in carbon fibre reinforced composites. IEE PROCEEDINGS-SCIENCE MEASUREMENT AND TECHNOLOGY, 148 (4). pp. 139-142. ISSN 1350-2344.
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Abstract
Laser techniques are beginning to be used for non-contact ultrasonic inspection of carbon fibre reinforced composites in industry. The ultrasound is normally generated with a high-power pulsed laser and is detected with a laser interferometer. Other non-contact detection methods can also be used, such as simpler laser beam deflection techniques and air coupled transducers. The authors compare the generation efficiency and damage thresholds of a fundamental Nd:YAG laser (1.06 mum), and a TEA CO, laser (10.6 mum) which is normally preferred for carbon-fibre reinforced composites). A Nd:YAG laser with an optical parametric oscillator (OPO) tunable up to 4 mum is also examined. The laser energy is absorbed within the optical absorption depth; the temperature rise is affected by the wavelength and laser pulse duration. It is essential to remain in the thermoelastic regime in order not to damage the material. A modified Michelson interferometer is used to detect the absolute displacement of the ultrasound. Optical beam deflection techniques and air-coupled transducers are also evaluated as detectors.
Item Type: | Journal Article | ||||
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||
Journal or Publication Title: | IEE PROCEEDINGS-SCIENCE MEASUREMENT AND TECHNOLOGY | ||||
Publisher: | IEE-INST ELEC ENG | ||||
ISSN: | 1350-2344 | ||||
Official Date: | July 2001 | ||||
Dates: |
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Volume: | 148 | ||||
Number: | 4 | ||||
Number of Pages: | 4 | ||||
Page Range: | pp. 139-142 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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