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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 27 — Dec. 17, 2012
  • pp: 28353–28362

High-sensitivity ultrasonic phase-shifted fiber Bragg grating balanced sensing system

Qi Wu and Yoji Okabe  »View Author Affiliations

Optics Express, Vol. 20, Issue 27, pp. 28353-28362 (2012)

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A high-sensitivity ultrasonic sensing system is proposed and demonstrated. In this system, a phase-shifted fiber Bragg grating (PS-FBG) is used as a sensor to achieve broadband and highly sensitive detection. The PS-FBG modulates the output of a tunable laser to detect the ultrasonic strain directly. Balanced photo-detector (BPD) is used for eliminating the DC component and further amplifying the AC component in the detected signal. Another major function of the BPD is to reject laser intensity noise. As a result, the minimum detectable strain is limited by the BPD’s noise and laser frequency noise. The sensitivity of the system is 9 nε/Hz1/2. Because of its high sensitivity, this system has the potential to be used in acousto-ultrasonic testing without amplifying the input signal and in practical acoustic emission detection.

© 2012 OSA

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:

Original Manuscript: September 25, 2012
Revised Manuscript: November 15, 2012
Manuscript Accepted: November 15, 2012
Published: December 6, 2012

Qi Wu and Yoji Okabe, "High-sensitivity ultrasonic phase-shifted fiber Bragg grating balanced sensing system," Opt. Express 20, 28353-28362 (2012)

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