Laser ultrasound system with embedded fiber optic interferometric sensor

John F. Dorighi; Sridhar Krishnaswamy; Jan D. Achenbach

doi:10.1117/12.216818

18 August 1995 Laser ultrasound system with embedded fiber optic interferometric sensor

John F. Dorighi, Sridhar Krishnaswamy, Jan D. Achenbach

Proceedings Volume 2622, Optical Engineering Midwest '95; (1995) https://doi.org/10.1117/12.216818
Event: Optical Engineering Midwest '95, 1995, Chicago, IL, United States

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.

Citation Download Citation

John F. Dorighi, Sridhar Krishnaswamy, and Jan D. Achenbach "Laser ultrasound system with embedded fiber optic interferometric sensor", Proc. SPIE 2622, Optical Engineering Midwest '95, (18 August 1995); https://doi.org/10.1117/12.216818

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