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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)

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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:

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

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)

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  1. L. R. Besprozvanny and A. R. Ball, “Liquid level sensor device,” US Patent 5,627,523 (1997).
  2. G. A. Campbell and R. Mutharasan, “Sensing of liquid level at micron resolution using self-excited millimeter-sized PZT-cantilever,” Sens. Actuators A Phys.122(2), 326–334 (2005). [CrossRef]
  3. S. Khaliq, S. W. James, and R. P. Tatam, “Fiber-optic liquid-level sensor using a long-period grating,” Opt. Lett.26(16), 1224–1226 (2001). [CrossRef] [PubMed]
  4. B. Yun, N. Chen, and Y. Cui, “Highly sensitive liquid-level sensor based on etched fiber Bragg grating,” IEEE Photon. Technol. Lett.19(21), 1747–1749 (2007). [CrossRef]
  5. D. Bo, Z. Qida, L. Feng, G. Tuan, X. Lifang, L. Shuhong, and G. Hong, “Liquid-level sensor with a high-birefringence-fiber loop mirror,” Appl. Opt.45(30), 7767–7771 (2006). [CrossRef] [PubMed]
  6. J. E. Antonio-Lopez, J. J. Sanchez-Mondragon, P. LiKamWa, and D. A. May-Arrioja, “Fiber-optic sensor for liquid level measurement,” Opt. Lett.36(17), 3425–3427 (2011). [CrossRef] [PubMed]
  7. T. Guo, Q. Zhao, Q. Dou, H. Zhang, L. Xue, G. Huang, and X. Dong, “Temperature-insensitive fiber Bragg grating liquid-level sensor based on bending cantilever beam,” IEEE Photon. Technol. Lett.17(11), 2400–2402 (2005). [CrossRef]
  8. B. Lee, “Review of the present status of optical fiber sensors,” Opt. Fiber Technol.9(2), 57–79 (2003). [CrossRef]
  9. Q. Liu, T. Tokunaga, and Z. He, “Realization of nano static strain sensing with fiber Bragg gratings interrogated by narrow linewidth tunable lasers,” Opt. Express19(21), 20214–20223 (2011). [CrossRef] [PubMed]
  10. Y. Zhang, M. Zhang, W. Jin, H. Ho, M. Demokan, B. Culshaw, and G. Stewart, “Investigation of erbium-doped fiber laser intra-cavity absorption sensor for gas detection,” Opt. Commun.232(1-6), 295–301 (2004). [CrossRef]
  11. D. Liu, N. Q. Ngo, S. C. Tjin, and X. Dong, “A dual-wavelength fiber laser sensor system for measurement of temperature and strain,” IEEE Photon. Technol. Lett.19(15), 1148–1150 (2007). [CrossRef]
  12. J. Liu, J. Yao, and T. H. Yeap, “Single-longitudinal-mode multiwavelength fiber ring laser,” IEEE Photon. Technol. Lett.16(4), 1020–1022 (2004). [CrossRef]
  13. X. Chen, J. Yao, and Z. Deng, “Ultranarrow dual-transmission-band fiber Bragg grating filter and its application in a dual-wavelength single-longitudinal-mode fiber ring laser,” Opt. Lett.30(16), 2068–2070 (2005). [CrossRef] [PubMed]
  14. Q. Sun, J. Wang, D. Liu, and P. Shum, “Optical generation of microwave signal using FBG-based double-ring fiber laser assisted by saturable absorber,” Microw. Opt. Technol. Lett.53, 2478–2481 (2011).
  15. M. A. Quintela, R. A. Perez-Herrera, I. Canales, M. Fernandez-Vallejo, M. Lopez-Amo, and J. M. Lopez-Higuer, “Stabilization of dual-wavelength erbium-doped fiber ring lasers by single-mode operation,” IEEE Photon. Technol. Lett.22(6), 368–370 (2010). [CrossRef]
  16. X. Chen, Z. Deng, and J. Yao, “Photonic generation of microwave signal using a dual-wavelength single-longitudinal-mode fiber ring laser,” IEEE Trans. Microw. Theory Tech.54(2), 804–809 (2006). [CrossRef]
  17. D. Chen, H. Fu, W. Liu, Y. Wei, and S. He, “Dual-wavelength single-longitudinal-mode erbium-doped fibre laser based on fibre Bragg grating pair and its application in microwave signal generation,” Electron. Lett.44(7), 459–461 (2008). [CrossRef]
  18. Q. Sun, J. Wang, W. Tong, J. Luo, and D. Liu, “Channel-switchable single-/dual-wavelength single-longitudinal-mode laser and THz beat frequency generation up to 3.6 THz,” Appl. Phys. B Lasers Opt.106(2), 373–377 (2012). [CrossRef]
  19. Y. Dai, Q. Sun, J. Zhang, J. Wo, and D. Liu, “Tunable dual-wavelength double-ring fiber laser and its application in highly sensitive temperature sensing,” in CLEO: Applications and Technology, OSA Technical Digest (online) (Optical Society of America, 2012), paper JW2A.75.
  20. K. O. Hill and G. Meltz, “Fiber Bragg grating technology fundamentals and overview,” J. Lightwave Technol.15(8), 1263–1276 (1997). [CrossRef]
  21. Y. Dai, Q. Sun, J. Wo, X. Li, M. Zhang, and D. Liu, “Highly sensitive liquid-level sensor based on weak uniform fiber Bragg grating with narrow-bandwidth,” Opt. Eng.51(4), 044401 (2012). [CrossRef]

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