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.
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