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Proceedings Paper

High repetition rate solid state switched CO2 TEA laser employed in industrial ultrasonic testing of aircraft parts
Author(s): Hubertus von Bergmann; Francois Morkel; Timo Stehmann
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Paper Abstract

Laser Ultrasonic Testing (UT) is an important technique for the non-destructive inspection of composite parts in the aerospace industry. In laser UT a high power, short pulse probe laser is scanned across the material surface, generating ultrasound waves which can be detected by a second low power laser system and are used to draw a defect map of the part. We report on the design and testing of a transversely excited atmospheric pressure (TEA) CO2 laser system specifically optimised for laser UT. The laser is excited by a novel solid-state switched pulsing system and utilises either spark or corona preionisation. It provides short output pulses of less than 100 ns at repetition rates of up to 1 kHz, optimised for efficient ultrasonic wave generation. The system has been designed for highly reliable operation under industrial conditions and a long term test with total pulse counts in excess of 5 billion laser pulses is reported.

Paper Details

Date Published: 3 February 2015
PDF: 6 pages
Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92552U (3 February 2015); doi: 10.1117/12.2068002
Show Author Affiliations
Hubertus von Bergmann, PaR Systems (Pty) Ltd. (South Africa)
Stellenbosch Univ. (South Africa)
Francois Morkel, PaR Systems (Pty) Ltd. (South Africa)
Timo Stehmann, Stellenbosch Univ. (South Africa)

Published in SPIE Proceedings Vol. 9255:
XX International Symposium on High-Power Laser Systems and Applications 2014
Chun Tang; Shu Chen; Xiaolin Tang, Editor(s)

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