Wide-Range Displacement Sensor Based on Common-Path FPI for High Temperature Application

Zhang, Qi; Luo, Jiefeng; Zhang, Xiaobei; Tang, Yan; Chen, Yizheng; Yang, Yong; Wang, Zijie; Yu, Yang; Wang, Yang; Huang, Yi; Wang, Tingyun

doi:10.1109/lpt.2023.3336635

Cited by 1 publication

(2 citation statements)

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“…Then the cascaded fiber is placed inside a microchannel on top surface of the base and inserted into a position in proximity to the 45° mirror. In our previous work, beam collimation effect of a quarter-pitch GIF has been studied and demonstrated [36]. Hence, the cascaded fiber is applied in the proposed acoustic sensor structure to achieve beam collimation and enhance beam coupling capability.…”

Section: Working Principle and Sensor Designmentioning

confidence: 99%

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High-Sensitivity EFPI-Based Acoustic Sensor Using in-Fiber Collimator and Adjustable 45° Mirror

Zhang,

Luo,

Zhang

et al. 2024

IEEE Photonics J.

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In this paper, a high-sensitivity cross-axial extrinsic Fabry-Perot interferometric (EFPI) acoustic sensor is proposed and experimentally demonstrated. The cross-axial EFPI is constructed by optical fiber and cantilever's inner surface, assisted with an adjustable 45° mirror. Herein, the 45° mirror is utilized to achieve beam total reflection and flexibly adjust the parallelism of the two reflectors. A quarter-pitch graded index fiber (GIF) is introduced as an in-fiber collimator to reduce beam propagation loss and thus enhance coupling efficiency. Experimental results show that the proposed sensor achieves a high fringe visibility of up to 41 dB, greatly enhancing acoustic sensing performance. Furthermore, the sensitivity and the minimum detectable pressure (MDP) measured at resonance frequency (@2.05 kHz) are significantly improved to be 70.67 mV/Pa that is corresponding to mechanical sensitivity of ~2490 nm/Pa, and 13.4 μPa/Hz 1/2 , respectively. The proposed sensor demonstrates the potential for low-frequency vibration monitoring with the advantages of easy fabrication, highsensitivity and flexible manipulability.

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Section: Working Principle and Sensor Designmentioning

confidence: 99%

“…Fig. 5(c) shows a microscopic view of the cascade fiber, where the GIF length is precisely controlled to be 245.60 μm, to serve as an in-fiber collimator [36].…”

Section: Working Principle and Sensor Designmentioning

confidence: 99%