High-temperature-resistant vector vibration sensor based on a ring cavity laser and a multicore fiber Bragg grating

Xizhen Xu; Jun He; Xunzhou Xiao; Yiping Wang

doi:10.1117/12.2681906

23 May 2023 High-temperature-resistant vector vibration sensor based on a ring cavity laser and a multicore fiber Bragg grating

Xizhen Xu, Jun He, Xunzhou Xiao, Yiping Wang

Author Affiliations +

Proceedings Volume 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023); 126432U (2023) https://doi.org/10.1117/12.2681906
Event: European Workshop on Optical Fibre Sensors (EWOFS 2023), 2023, Mons, Belgium

Abstract

We propose and demonstrate a vector vibration sensor with high-temperature resistance, consisting of a ring cavity laser and fiber Bragg gratings (FBGs) inscribed in seven-core fiber (SCF) by using femtosecond laser auto-positioning pointby- point technology. A vibration sensing probe is composed of three FBGs inscribed in the outer cores of SCF. Note that they have 120° angular separation in the SCF. Moreover, the FBG inscribed in the central core of SCF is employed as a narrow band reflector in the ring cavity laser, enabling the laser to achieve the ability of temperature and strain compensation. Such a proposed sensor can be used to measure vibration orientation and acceleration simultaneously. The sensing performance of this device was demonstrated and discussed. The results show that it has a working frequency bandwidth ranging from 4 to 68 Hz, a maximum sensitivity of 54.2 mV/g, and the azimuthal angle accuracy of 0.21°. Furthermore, we investigated the vibration responses at high temperature of this device, and the results demonstrate that the proposed vector vibration sensor can operate at 550 °C. Therefore, such a proposed vector vibration sensor can be applied in harsh environments, such as aerospace and nuclear reactor.

Citation Download Citation

Xizhen Xu, Jun He, Xunzhou Xiao, and Yiping Wang "High-temperature-resistant vector vibration sensor based on a ring cavity laser and a multicore fiber Bragg grating", Proc. SPIE 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023), 126432U (23 May 2023); https://doi.org/10.1117/12.2681906

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