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

Full text not available from this repository.

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
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
Date:	July 2001
Volume:	148
Number:	4
Number of Pages:	4
Page Range:	pp. 139-142
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/11683

Data sourced from Thomson Reuters' Web of Knowledge

Request changes to a record

Actions (login required)

View Item