A Highly sensitive LPFG torsion sensor with step-index cladding modulation

IF 4.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical Pub Date : 2025-09-08 DOI:10.1016/j.sna.2025.117041

Jianyang Kang , Suihu Dang , Xingkai Wang , Kangjing Zeng , Yunfeng Bai , Yuanchong Wang , Liangping Xia , Chunlei Du

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引用次数: 0

Abstract

Based on the current research on long-period fiber gratings (LPFGs), we propose a stepped LPFG torsion sensor designed to enhance the torsional sensitivity of existing sensors. The sensor combines CO2 laser polishing and pre-twisting techniques to increase the refractive index difference between neighboring notches. This method is effective in enhancing the introduction of elliptical birefringence to improve the torsional sensing sensitivity. Through comparative experiments, the effect of different pre-twist angles

β

on sensor sensitivity was studied. When the applied pre-twist force was greater, the residual twist force in the optical fiber was greater, and the corresponding twist sensitivity also increased. The experimental results demonstrate a torsional sensitivity of up to 0.45 nm/(rad/m) in the range of 0 to -18.48 rad/m. However, due to non-uniform modulation of elliptical birefringence, the sensitivity decreases to 0.362 nm/(rad/m) for the range of 0–18.48 rad/m. Furthermore, the temperature characteristics of the sensor were investigated, demonstrating a sensitivity of 65 pm/ °C within the measurement range of 20 °C to 110 °C. The results demonstrate that the proposed sensor offers a novel solution for enhancing torsional sensing performance, with significant application value in engineering measurement fields.

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采用阶跃折射率包层调制的高灵敏度LPFG扭转传感器

基于目前长周期光纤光栅（LPFGs）的研究现状，提出了一种阶梯式长周期光纤光栅扭转传感器，以提高现有传感器的扭转灵敏度。该传感器结合了CO2激光抛光和预扭技术，以增加相邻缺口之间的折射率差。该方法可以有效地增强椭圆双折射的引入，提高扭转传感的灵敏度。通过对比实验，研究了不同预扭角β对传感器灵敏度的影响。施加的预扭力越大，光纤中的残余扭力越大，相应的扭灵敏度也越大。实验结果表明，在0 ~ -18.48 rad/m范围内，扭转灵敏度可达0.45 nm/(rad/m)。但由于椭圆双折射的非均匀调制，在0 ~ 18.48 rad/m范围内，灵敏度降至0.362 nm/(rad/m)。此外，研究了传感器的温度特性，表明在20°C至110°C的测量范围内，传感器的灵敏度为65 pm/°C。结果表明，该传感器为提高扭振传感性能提供了一种新的解决方案，在工程测量领域具有重要的应用价值。

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来源期刊

Sensors and Actuators A-physical 工程技术-工程：电子与电气

CiteScore

8.10

自引率

6.50%

发文量

630

审稿时长

49 days

期刊介绍： Sensors and Actuators A: Physical brings together multidisciplinary interests in one journal entirely devoted to disseminating information on all aspects of research and development of solid-state devices for transducing physical signals. Sensors and Actuators A: Physical regularly publishes original papers, letters to the Editors and from time to time invited review articles within the following device areas: • Fundamentals and Physics, such as: classification of effects, physical effects, measurement theory, modelling of sensors, measurement standards, measurement errors, units and constants, time and frequency measurement. Modeling papers should bring new modeling techniques to the field and be supported by experimental results. • Materials and their Processing, such as: piezoelectric materials, polymers, metal oxides, III-V and II-VI semiconductors, thick and thin films, optical glass fibres, amorphous, polycrystalline and monocrystalline silicon. • Optoelectronic sensors, such as: photovoltaic diodes, photoconductors, photodiodes, phototransistors, positron-sensitive photodetectors, optoisolators, photodiode arrays, charge-coupled devices, light-emitting diodes, injection lasers and liquid-crystal displays. • Mechanical sensors, such as: metallic, thin-film and semiconductor strain gauges, diffused silicon pressure sensors, silicon accelerometers, solid-state displacement transducers, piezo junction devices, piezoelectric field-effect transducers (PiFETs), tunnel-diode strain sensors, surface acoustic wave devices, silicon micromechanical switches, solid-state flow meters and electronic flow controllers. Etc...