Remote detection of laser generated ultrasonics by fibre optic interferometer

This thesis is concerned with the development of a totally remote all-optic nondestructive testing and evaluation technique suitable for use in a range of adverse measuring environments. It differs from previous work in that the technique is made much more flexible and suitable for a greater range of measurement environments by the use of fibre optics. There is little problem in using optical fibres for delivery of high power Q-switched pulses to excite acoustic waves in target materials. However, the use of fibre optic interferometers in remote detection of these pulses presents very significant signal to noise problems. This thesis describes the development of a high performance fibre optic interferometer which can be used to detect small wideband ultrasonic displacement waveforms generated in laser induced ultrasonics.

Name dc:type.qualificationname

phd

Level dc:type.qualificationlevel

doctoral

Grantor dc:publisher.institution

Victoria University of Technology

Year dc:date.issued

1997

Author dc:creator

• Mitra, Biswanath

• 0205 Optical Physics
• School of Engineering and Science

Language dc:language

en