Optical Fiber Sensor with Novel Structure and Its Applications in Oil and Gas Exploration

IF 0.6 4区 工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC
Yuhua Xie, Kun Zhao, Hengle Li
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Abstract

Compared to electronic sensors, Optical Fiber Sensors (OFSs) have received increasing attention due to their advantages, such as small size, light weight, anti-electromagnetic interference, easy reuse, and remote sensing. This paper proposes a novel all-fiber mode interferometer. This interferometer excites higher-order cladding modes through mode mismatch between standard single-mode fibers and thin cores. There is interference between higher-order cladding mode and core layer mode, resulting in interference fringes used as sensing signals. Sensitivity testing is conducted on the designed OFS to demonstrate whether it meets the application requirements for petroleum exploration. Transmission-type Thin-Core Fiber Modal Interferometers (TCFMIs) with different lengths of Thin-Core Fibers (TCFs) (20 mm, 40 mm, and 60 mm) are produced in the experiment. Among them, TCFMIs at 60 mm TCF length can obtain ideal sensing signals. The TCFMI (with a length of 20 mm TCF) is encapsulated in a self-made aluminum groove in rosin to test its Refractive Index (RI). The results show that as the RI increases, the central wavelength shifts towards the long wavelength direction. Its sensitivity reaches 146 nm/R.I.U. When the temperature is increased, the central wavelength shifts towards the long wavelength direction, resulting in lower temperature sensitivity. In the sensitivity test, the phase change obtained by designing OFSs is proportional to the vibration acceleration. It is fixed on the vibration table to keep the acceleration of the vibration table constant and adjust the vibration frequency of the vibration table. The results show that the vibration spectral line of the sensor is relatively flat within 100 Hz, and resonance occurs within the range of 200 Hz to 350 Hz. Through phase demodulation, sensors loaded with different oscillator masses increase linearly in the low-frequency range. When the vibration frequency approaches the resonance frequency of the sensor, the phase sensitivity of the sensor increases nonlinearly.
结构新颖的光纤传感器及其在油气勘探中的应用
与电子传感器相比,光纤传感器(OFS)具有体积小、重量轻、抗电磁干扰、易于重复使用和遥感等优点,因此受到越来越多的关注。本文提出了一种新型全光纤模式干涉仪。这种干涉仪通过标准单模光纤和薄纤芯之间的模式失配激发高阶包层模式。高阶包层模式和纤芯层模式之间会产生干涉,从而产生用作传感信号的干涉条纹。对所设计的 OFS 进行了灵敏度测试,以证明其是否符合石油勘探的应用要求。实验中制作了具有不同长度(20 毫米、40 毫米和 60 毫米)薄芯光纤(TCF)的透射型薄芯光纤模态干涉仪(TCFMI)。其中,TCF 长度为 60 毫米的 TCFMI 可以获得理想的传感信号。将 TCFMI(TCF 长度为 20 毫米)封装在松香自制的铝槽中,测试其折射率(RI)。结果表明,随着折射率的增加,中心波长向长波方向移动。其灵敏度达到 146 nm/R.I.U。当温度升高时,中心波长向长波方向移动,导致温度灵敏度降低。在灵敏度测试中,设计 OFS 所获得的相位变化与振动加速度成正比。它固定在振动台上,使振动台的加速度保持恒定,并调节振动台的振动频率。结果表明,传感器的振动谱线在 100 Hz 范围内相对平坦,共振发生在 200 Hz 至 350 Hz 范围内。通过相位解调,加载不同振子质量的传感器在低频范围内呈线性增长。当振动频率接近传感器的共振频率时,传感器的相位灵敏度会非线性增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Nanoelectronics and Optoelectronics
Journal of Nanoelectronics and Optoelectronics 工程技术-工程:电子与电气
自引率
16.70%
发文量
48
审稿时长
12.5 months
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