Non-Contact Detection Of Pulsed Acoustic Displacements For The Evaluation Of Sub-Surface Defects

A. J.A. Bruinsma

doi:10.1117/12.941089

14 October 1987 Non-Contact Detection Of Pulsed Acoustic Displacements For The Evaluation Of Sub-Surface Defects

A. J.A. Bruinsma

Proceedings Volume 0798, Fiber Optic Sensors II; (1987) https://doi.org/10.1117/12.941089
Event: Fourth International Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, The Hague, Netherlands

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.

Citation Download Citation

A. J.A. Bruinsma "Non-Contact Detection Of Pulsed Acoustic Displacements For The Evaluation Of Sub-Surface Defects", Proc. SPIE 0798, Fiber Optic Sensors II, (14 October 1987); https://doi.org/10.1117/12.941089

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