Twin-core fiber-based sensor for measuring the strain and bending simultaneously

Yuanyuan Yang; Yaxun Zhang; Zhihai Liu; Jun Yang; Libo Yuan

doi:10.1117/12.2033577

29 August 2013 Twin-core fiber-based sensor for measuring the strain and bending simultaneously

Yuanyuan Yang, Yaxun Zhang, Zhihai Liu, Jun Yang, Libo Yuan

Proceedings Volume 8914, International Symposium on Photoelectronic Detection and Imaging 2013: Fiber Optic Sensors and Optical Coherence Tomography; 89140L (2013) https://doi.org/10.1117/12.2033577
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

A novel composite interferometer sensor is presented and its sensing characteristics are investigated. Based on the infiber integrated Michelson interferometer, a quartz tube is used to encapsulate the ends of the twin-core fiber and single mode fiber to form the dual extrinsic FP cavities. Thereby, the Michelson and FP configurations are integrated into a single fiber, which we call it Michelson-FP composite interferometer sensor. The novel sensor can respond to the axial strain and radial bending simultaneously. We have derived and analyzed the interferometer principle of the new structure. The analysis results show that the interferometer sensor could be considered as the superposition of Michelson interferometer and FP interferometer. Moreover, we establish a testing system and conduct a series of experiments to investigate the strain and bending characteristics. We measure the reflection spectra with the spectrum analyzer. The spectral response of the composite interferometer sensor presents two pattern fringes with different frequencies due to the respective optical path interferometers. The experimental results indicate that the composite interferometer sensor is very sensitive to the strain and bending characteristics, and the presented sensor has different strain and bending sensitivity coefficients. Due to these characteristics, the presented sensor might be able to measure the strain and bending characteristics simultaneously. In conclusion, the presented novel interferometer sensor is of compact structure, high integration and good strain and bending sensing characteristics. Thus, many types of fiber-optic sensors may be built based on it.

Citation Download Citation

Yuanyuan Yang, Yaxun Zhang, Zhihai Liu, Jun Yang, and Libo Yuan "Twin-core fiber-based sensor for measuring the strain and bending simultaneously", Proc. SPIE 8914, International Symposium on Photoelectronic Detection and Imaging 2013: Fiber Optic Sensors and Optical Coherence Tomography, 89140L (29 August 2013); https://doi.org/10.1117/12.2033577

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