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Proceedings Paper

Non-Contact Detection Of Pulsed Acoustic Displacements For The Evaluation Of Sub-Surface Defects
Author(s): A. J.A. Bruinsma
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Paper Abstract

The development of optical methods for detection of ultrasound is important for the technology of non-contact Non-Destructive Evaluation of materials. Several optical methods are limited in their application by their sensitivity for ambient vibrations or their complexity. In this paper a Fiber Time Delay Interferometer is proposed which can be applied to the detection of pulsed ultrasonic vibrations. A practical instrument has been built with a detection limit of 2.10-11m, determined with a detection bandwidth of 10 MHz. Results of experiments show that the method can be used for the detection of (artificial) sub-surface fatigue cracks, using pulsed ultrasonic excitation.

Paper Details

Date Published: 14 October 1987
PDF: 6 pages
Proc. SPIE 0798, Fiber Optic Sensors II, (14 October 1987); doi: 10.1117/12.941089
Show Author Affiliations
A. J.A. Bruinsma, TNO Institute of Applied Physics (TPD TNO-TH) (The Netherlands)

Published in SPIE Proceedings Vol. 0798:
Fiber Optic Sensors II
Anna Maria Verga Scheggi, Editor(s)

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