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Optics Letters

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  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 15 — Aug. 1, 2014
  • pp: 4462–4465

Adaptive ultrasonic sensor using a fiber ring laser with tandem fiber Bragg gratings

Tongqing Liu, Lingling Hu, and Ming Han  »View Author Affiliations


Optics Letters, Vol. 39, Issue 15, pp. 4462-4465 (2014)
http://dx.doi.org/10.1364/OL.39.004462


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Abstract

We propose and demonstrate an intensity-demodulated fiber-optic ultrasonic sensor system that can be self-adaptive to large quasi-static background strain perturbations. The sensor system is based on a fiber ring laser (FRL) whose laser cavity includes a pair of fiber Bragg gratings (FBGs). Self-adaptive ultrasonic detection is achieved by a tandem design where the two FBGs are engineered to have differential spectral responses to ultrasonic waves and are installed side-by-side at the same location on a structure. As a result, ultrasonic waves lead to relative spectral shifts of the FBGs and modulations to the cold-cavity loss of the FRL. Ultrasonic waves can then be detected directly from the laser intensity variations in response to the cold-cavity loss modulation. The sensor system is insensitive to quasi-static background strains because they lead to identical responses of the tandem FBGs. Based on the principle, a FRL sensor system was demonstrated and tested for adaptive ultrasonic detection when large static strains as well as dynamic sinusoidal vibrations were applied to the sensor.

© 2014 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(140.3510) Lasers and laser optics : Lasers, fiber
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: May 6, 2014
Manuscript Accepted: June 23, 2014
Published: July 24, 2014

Citation
Tongqing Liu, Lingling Hu, and Ming Han, "Adaptive ultrasonic sensor using a fiber ring laser with tandem fiber Bragg gratings," Opt. Lett. 39, 4462-4465 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-15-4462

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