• Optoelectronics Letters
  • Vol. 15, Issue 1, 6 (2019)
Xing-hu FU*, Dong WANG, Lian-xu LIU, Fan LIU, Jing WEN, Guang-wei FU, and Wei-hong BI
Author Affiliations
  • The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province, School of Information Science and Engineering, Yanshan University, Qinhuangdao 066004, China
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    Abstract

    Based on the principle of Fabry-Perot (F-P) interference, a new type of optical fiber curvature sensor is presented, which is fabricated by single-mode fiber (SMF), ceramic tube and double-cladding fiber (DCF). And the curvature sensing properties are analyzed, and the double-peak method is used to demodulate the cavity length. The experimen-tal results show that the F-P interference spectrum shifts toward long wavelengths with increasing the curvature. And the sensors are placed in different positions on the cantilever to get their different curvature sensitivities. Smaller initial cavity length gives greater sensor sensitivity. The best curvature sensitivity is achieved as 2 554.53 pm/m-1 in 0.71—1.18 m-1. By demodulating the length of the F-P cavity, the cavity length of sensor 4 is changed by 0.08 mm. Therefore, the sensor has some potential for measure the small displacement.
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    FU Xing-hu, WANG Dong, LIU Lian-xu, LIU Fan, WEN Jing, FU Guang-wei, BI Wei-hong. A double-cladding fiber curvature sensor based on the extrinsic Fabry-Perot interferometer[J]. Optoelectronics Letters, 2019, 15(1): 6
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    Received: Jul. 13, 2018
    Accepted: Oct. 3, 2018
    Posted: Jan. 1, 2019
    Published Online: Apr. 11, 2019
    The Author Email: Xing-hu FU (fuxinghu@ysu.edu.c)