Dual Sagnac interferometers for sensitivity-enhanced temperature sensing based on amplitude comparison function

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.2025.117000

Haoyan Liu , Fangshuo Shi , Wenbo Wang , Xinyu Cao , Lanxin Zhu , Huimin Huang , Yanjun Chen , Zhengbin Li

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Abstract

A sensitivity-enhanced optical fiber temperature sensor based on dual Sagnac interferometers is proposed and experimentally demonstrated. In the proposed system, Sagnac interferometers are constructed by embedding different lengths of polarization-maintaining fibers into single-mode fibers, resulting in two Sagnac interferometers (SIs) with distinct transmission characteristics. As the temperature changes, the transmission spectra of the SIs shifts, resulting in changes in the output power of the system. To enhance the sensitivity to temperature, an amplitude comparison function is employed based on the power ratio of two outputs of the SIs. A temperature variation experiment based on the temperature-controlled chamber has been carried out for verification, validating the ability to detect slight temperature variations. Furthermore, the sensor based on the dual-SIs configuration effectively resolves the dead zone issue inherent in the single-SI configuration, achieving up to a 32.3-fold enhancement in sensitivity. Compared to conventional methods, the proposed temperature sensor has a simpler configuration and does not rely on complex instruments such as an optical spectrum analyzer, offering low-cost sensors with enhanced sensitivity for precision temperature measurements.

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基于振幅比较函数的双Sagnac干涉仪灵敏度增强温度传感

提出了一种基于双Sagnac干涉仪的增敏光纤温度传感器，并进行了实验验证。在该系统中，通过在单模光纤中嵌入不同长度的保偏光纤来构建Sagnac干涉仪，从而得到两个具有不同传输特性的Sagnac干涉仪。随着温度的变化，si的透射光谱发生位移，导致系统输出功率发生变化。为了提高对温度的灵敏度，采用了基于si的两个输出功率比的幅度比较函数。基于温控室的温度变化实验进行了验证，验证了检测微小温度变化的能力。此外，基于双si配置的传感器有效地解决了单si配置固有的死区问题，灵敏度提高了32.3倍。与传统方法相比，所提出的温度传感器具有更简单的配置，不依赖于复杂的仪器，如光谱分析仪，提供低成本的传感器，提高了精确温度测量的灵敏度。

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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...