Stabilization of an Embedded Fiber Optic Fabry-Perot Sensor for Ultrasound Detection

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

doi:10.1109/58.464837

Stabilization of an Embedded Fiber Optic Fabry-Perot Sensor for Ultrasound Detection

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

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

83 Scopus citations

Abstract

A method is proposed to stabilize an intrinsic fiber optic Fabry–Perot interferometric sensor embedded in a solid material for the purpose of detecting ultrasound. Without stabilization the interferometer drifts out of quadrature due to the presence of low-frequency dynamic strains. Stabilization is achieved by using active homodyne stabilization which tunes the laser frequency to maintain quadrature. A control loop shifts the laser frequency by 10 GHz at rates less than 25 Hz in order to compensate for induced drifts. The stabilization procedure was tested for a sensor embedded in an epoxy plate. Ultrasonic pulses, generated by a 5 MHz piezoelectric transducer, were detected with the embedded fiber sensor stabilized in the presence of applied low frequency strains. Improvements in sensitivity which result from stabilization are demonstrated. Additionally, a simulated acoustic emission signal, generated by a lead pencil break (Hsu-Neilson source), was detected with the sensor stabilized in the presence of dynamic strains.

Original language	English (US)
Pages (from-to)	820-824
Number of pages	5
Journal	IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume	42
Issue number	5
DOIs	https://doi.org/10.1109/58.464837
State	Published - Sep 1995

ASJC Scopus subject areas

Instrumentation
Acoustics and Ultrasonics
Electrical and Electronic Engineering

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title = "Stabilization of an Embedded Fiber Optic Fabry-Perot Sensor for Ultrasound Detection",

abstract = "A method is proposed to stabilize an intrinsic fiber optic Fabry–Perot interferometric sensor embedded in a solid material for the purpose of detecting ultrasound. Without stabilization the interferometer drifts out of quadrature due to the presence of low-frequency dynamic strains. Stabilization is achieved by using active homodyne stabilization which tunes the laser frequency to maintain quadrature. A control loop shifts the laser frequency by 10 GHz at rates less than 25 Hz in order to compensate for induced drifts. The stabilization procedure was tested for a sensor embedded in an epoxy plate. Ultrasonic pulses, generated by a 5 MHz piezoelectric transducer, were detected with the embedded fiber sensor stabilized in the presence of applied low frequency strains. Improvements in sensitivity which result from stabilization are demonstrated. Additionally, a simulated acoustic emission signal, generated by a lead pencil break (Hsu-Neilson source), was detected with the sensor stabilized in the presence of dynamic strains.",

author = "Dorighi, {John F.} and Sridhar Krishnaswamy and Achenbach, {Jan D.}",

note = "Funding Information: Manuscript received December 15, 1994; revised March 7, 1995. This work was supported by the Air Force Office of Sponsored Research under Award F4960-92-J-0342AFOSR. The authors are with the Center for Quality Engineering and Failure Prevention, Northwestern University, Evanston, IL 60208 USA. IEEE Log Number 9413784.",

year = "1995",

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AU - Krishnaswamy, Sridhar

AU - Achenbach, Jan D.

N1 - Funding Information: Manuscript received December 15, 1994; revised March 7, 1995. This work was supported by the Air Force Office of Sponsored Research under Award F4960-92-J-0342AFOSR. The authors are with the Center for Quality Engineering and Failure Prevention, Northwestern University, Evanston, IL 60208 USA. IEEE Log Number 9413784.

PY - 1995/9

Y1 - 1995/9

N2 - A method is proposed to stabilize an intrinsic fiber optic Fabry–Perot interferometric sensor embedded in a solid material for the purpose of detecting ultrasound. Without stabilization the interferometer drifts out of quadrature due to the presence of low-frequency dynamic strains. Stabilization is achieved by using active homodyne stabilization which tunes the laser frequency to maintain quadrature. A control loop shifts the laser frequency by 10 GHz at rates less than 25 Hz in order to compensate for induced drifts. The stabilization procedure was tested for a sensor embedded in an epoxy plate. Ultrasonic pulses, generated by a 5 MHz piezoelectric transducer, were detected with the embedded fiber sensor stabilized in the presence of applied low frequency strains. Improvements in sensitivity which result from stabilization are demonstrated. Additionally, a simulated acoustic emission signal, generated by a lead pencil break (Hsu-Neilson source), was detected with the sensor stabilized in the presence of dynamic strains.

AB - A method is proposed to stabilize an intrinsic fiber optic Fabry–Perot interferometric sensor embedded in a solid material for the purpose of detecting ultrasound. Without stabilization the interferometer drifts out of quadrature due to the presence of low-frequency dynamic strains. Stabilization is achieved by using active homodyne stabilization which tunes the laser frequency to maintain quadrature. A control loop shifts the laser frequency by 10 GHz at rates less than 25 Hz in order to compensate for induced drifts. The stabilization procedure was tested for a sensor embedded in an epoxy plate. Ultrasonic pulses, generated by a 5 MHz piezoelectric transducer, were detected with the embedded fiber sensor stabilized in the presence of applied low frequency strains. Improvements in sensitivity which result from stabilization are demonstrated. Additionally, a simulated acoustic emission signal, generated by a lead pencil break (Hsu-Neilson source), was detected with the sensor stabilized in the presence of dynamic strains.

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Stabilization of an Embedded Fiber Optic Fabry-Perot Sensor for Ultrasound Detection

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