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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 37, Iss. 16 — Aug. 15, 2012
  • pp: 3336–3338

Ultrasonic sensor employing two cascaded phase-shifted fiber Bragg gratings suitable for multiplexing

Qi Wu and Yoji Okabe  »View Author Affiliations


Optics Letters, Vol. 37, Issue 16, pp. 3336-3338 (2012)
http://dx.doi.org/10.1364/OL.37.003336


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Abstract

An ultrasonic sensor based on two cascaded phase-shifted fiber Bragg gratings (PS-FBGs) is proposed and demonstrated. In place of an external cavity laser, a broadband amplified spontaneous emission light source is used to demonstrate multiplexing ability suitable for sensor networks. The system has a high sensitivity to ultrasonic waves generated by a PZT actuator placed 7.5 cm away from the PS-FBG, because of the steep slope in the center of the PS-FBG spectrum. A second advantage of the phase shift is to reduce the effective sensor length, leading to the achievement of broadband characteristics. A pencil lead break test was performed and all results are compared to a traditional PZT sensor.

© 2012 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: May 21, 2012
Revised Manuscript: June 27, 2012
Manuscript Accepted: July 13, 2012
Published: August 6, 2012

Citation
Qi Wu and Yoji Okabe, "Ultrasonic sensor employing two cascaded phase-shifted fiber Bragg gratings suitable for multiplexing," Opt. Lett. 37, 3336-3338 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-16-3336


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