Embedded fiber optic ultrasonic sensors and generators

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

doi:10.1117/12.207765

20 April 1995 Embedded fiber optic ultrasonic sensors and generators

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

Proceedings Volume 2574, Pacific Northwest Fiber Optic Sensor Workshop; (1995) https://doi.org/10.1117/12.207765
Event: Pacific Northwest Fiber Optic Sensor Workshop, 1995, Troutdale, OR, United States

Abstract

Ultrasonic sensors and generators based on fiber-optic systems are described. It is shown that intrinsic fiber optic Fabry-Perot ultrasound sensors that are embedded in a structure can be stabilized by actively tuning the laser frequency. The need for this method of stabilization is demonstrated by detecting piezoelectric transducer-generated ultrasonic pulses in the presence of low frequency dynamic strains that are intentionally induced to cause sensor drift. The actively stabilized embedded fiber optic Fabry-Perot sensor is also shown to have sufficient sensitivity to detect ultrasound that is generated in the interior of a structure by means of a high-power optical fiber that pipes energy from a pulsed laser to an embedded generator of ultrasound.

Citation Download Citation

John F. Dorighi, Sridhar Krishnaswamy, and Jan D. Achenbach "Embedded fiber optic ultrasonic sensors and generators", Proc. SPIE 2574, Pacific Northwest Fiber Optic Sensor Workshop, (20 April 1995); https://doi.org/10.1117/12.207765

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