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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/978

Title: Design and optimisation of a pulsed CO2 laser for laser ultrasonic applications
Authors: Forbes, A
Botha, LR
Du Preez, N
Drake, TE
Keywords: Laser ultrasonics
Laser parameters
Gas influences
Stable discharge
Issue Date: Jul-2006
Publisher: Acad Science South Africa A S S AF
Citation: Forbes, A, et al. 2006. Design and optimisation of a pulsed CO2 laser for laser ultrasonic applications. South African Journal of Science 102, July/August 2006, Vol. 102(7/8), pp 329-334
Abstract: Laser ultrasonic is currently the optimal method for non-destructive testing of composite materials in the aerospace industry. The process is based on a laser-generated, ultrasound wave which propagates inside the composite. The response at the material surface is detected and converted into a defect map across the aircraft. The design and optimization of a laser system for this application, together with the basic science involved, is reviewed in this paper. This includes the optimization of laser parameters, such as output couplers and gas mixture, and the impact these choices have on the laser chemistry. We present a theory for the catalytic recombination of the gas which shows excellent agreement with experiment. Finally, an operating laser system for this application, yielding a six fold improvement in performance over conventional laser systems, is described.
Description: Copyright: 2006 Acad Science South Africa A S S AF
URI: http://hdl.handle.net/10204/978
ISSN: 0038-2353
Appears in Collections:Laser physics and technology
Laser materials processing
General science, engineering & technology

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