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Proceedings Paper

Laser ultrasound system with embedded fiber optic interferometric sensor
Author(s): John F. Dorighi; Sridhar Krishnaswamy; Jan D. Achenbach
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Paper Abstract

A localized fiber optic interferometric sensor was embedded in an epoxy plate for the purpose of detecting ultrasound. The sensor embedded was a low finesse Fabry-Perot, which was actively stabilized by tuning the laser frequency. The embedded sensor was used to detect ultrasound generated by a range of techniques which included: i) a 5 MHz piezoelectric transducer, ii) surface laser generated ultrasound, iii) laser generated ultrasound using an embedded fiber generator, and iv) a simulated acoustic emission event (lead pencil break). The frequency content of these signals ranged from the hundreds of kilohertz to beyond 5 MHz. The embedded FOFP was able to detect all of the signals generated, indicating its utility as a broadband ultrasound detector.

Paper Details

Date Published: 18 August 1995
PDF: 11 pages
Proc. SPIE 2622, Optical Engineering Midwest '95, (18 August 1995); doi: 10.1117/12.216818
Show Author Affiliations
John F. Dorighi, Northwestern Univ. (United States)
Sridhar Krishnaswamy, Northwestern Univ. (United States)
Jan D. Achenbach, Northwestern Univ. (United States)


Published in SPIE Proceedings Vol. 2622:
Optical Engineering Midwest '95

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