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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 25 — Dec. 3, 2012
  • pp: 27367–27376

Highly sensitive liquid-level sensor based on dual-wavelength double-ring fiber laser assisted by beat frequency interrogation

Yi Dai, Qizhen Sun, Sisi Tan, Jianghai Wo, Jiejun Zhang, and Deming Liu  »View Author Affiliations


Optics Express, Vol. 20, Issue 25, pp. 27367-27376 (2012)
http://dx.doi.org/10.1364/OE.20.027367


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Abstract

A highly sensitive liquid-level sensor based on dual-wavelength single-longitudinal-mode fiber laser is proposed and demonstrated. The laser is formed by exploiting two parallel arranged phase-shift fiber Bragg gratings (ps-FBGs), acting as ultra-narrow bandwidth filters, into a double-ring resonators. By beating the dual-wavelength lasing output, a stable microwave signal with frequency stability better than 5 MHz is obtained. The generated beat frequency varies with the change of dual-wavelength spacing. Based on this characteristic, with one ps-FBG serving as the sensing element and the other one acting as the reference element, a highly sensitive liquid level sensor is realized by monitoring the beat frequency shift of the laser. The sensor head is directly bonded to a float which can transfer buoyancy into axial strain on the fiber without introducing other elastic elements. The experimental results show that an ultra-high liquid-level sensitivity of 2.12 × 107 MHz/m within the measurement range of 1.5 mm is achieved. The sensor presents multiple merits including ultra-high sensitivity, thermal insensitive, good reliability and stability.

© 2012 OSA

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(140.0140) Lasers and laser optics : Lasers and laser optics

ToC Category:
Sensors

History
Original Manuscript: September 28, 2012
Revised Manuscript: November 3, 2012
Manuscript Accepted: November 12, 2012
Published: November 21, 2012

Citation
Yi Dai, Qizhen Sun, Sisi Tan, Jianghai Wo, Jiejun Zhang, and Deming Liu, "Highly sensitive liquid-level sensor based on dual-wavelength double-ring fiber laser assisted by beat frequency interrogation," Opt. Express 20, 27367-27376 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-25-27367


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