Fiber-optic displacement sensor based on the DBR fiber laser

Abstract

The fiber-optic displacement sensor based on the distributed Bragg reflector fiber laser is proposed, that is, the fiber laser cavity is attached to the measured object, when the measured object is stretched or contracted, and the length of the fiber laser cavity is also stretched or contracted accordingly. In view of the nonlinearity of the fiber-optic displacement sensor, the calibration based on piezoelectric ceramics is applied to improve the linearity of the displacement sensor. Experiment results show that the fiber-optic displacement sensor has a linear response with the nominal working distance of 90 μm.

Keywords

DBR fiber laser / fiber-optic displacement sensor / fiber laser cavity / FBG

References

[1] Li C, Zhang Y M, Liu H, Wu S, Huang C W. Distributed fiber-optic bi-directional strain-displacement sensor modulated by fiber bending loss. Sensors and Actuators A: Physical, 2004, 111(2-3): 236-239.

[2] Chuang K C, Ma C C. Pointwise fiber Bragg grating displacement sensor system for dynamic measurement. Applied Optics, 2008, 47(20): 3561-3567.

[3] Allen G, Sun K X, Byer R. Fiber-coupled, Littrow-grating cavity displacement sensor. Optics Letters, 2010, 35(8): 1260-1262.

[4] Zheng J. Triple sensor multiplexed frequency modulated continuous wave interferometric fiber optic displacement sensor. Applied Optics, 2007, 46(12): 2189-2196.

[5] Feng Z Q, Zhang Y, Tan Y N, Wu C. Hydrostatic pressure sensors based on ultrashot distributed-Bragg-reflector fiber lasers. Optical Engineering, 2010, 49(10): 100502.

[6] Gary A M, Geoffrey A C, Clay K K. High-performance sensing using fiber lasers. Optics and Photonics News, 2012, 23(2): 30-36.

[7] Zhang Y, Guan B O, Tam H Y. Characteristics of the distributed Bragg reflector fiber laser sensor for lateral force measurement. Optics Communications, 2008, 281(18): 4619-4622.

[8] Guo T, Wong A C L, Liu W S, Guan B O, Lu C, Tam H Y. Ultrasound detection using a tunable low beat-frequency Er³⁺-doped DBR fiber laser. 21st International Conference on Optical Fiber Sensors, Ottawa, Canada, May 15, 2011, 7753, 775336.

[9] Liu W S, Guo T, Wong A C, Tam H Y, He S L. Highly sensitive bending sensor based on Er³⁺-doped DBR fiber laser. Optics Express, 2010, 18(16): 17834-17840.

[10] Guo T, Allan C L W, Liu W S, Guan B O, Lu C, Tam H Y. Beat-frequency adjustable Er³⁺-doped DBR fiber laser for ultrasound detection. Optics Express, 2011, 19(3): 2485-2492.