Low-temperature-crosstalk humidity fiber sensor based on a thermal expansion-resistant Fabry-Perot interferometer

IF 5.2 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Measurement Pub Date : 2024-11-23 DOI:10.1016/j.measurement.2024.116302

Haiming Qiu , Mengxuan Zhu , Shuji Mo , Ying Gao , Yong Yao , Yongkang Dong , Jiajun Tian

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Abstract

A low-temperature-crosstalk fiber-optic humidity sensor based on a thermal expansion-resistant Fabry-Pérot interferometer (FPI) has been proposed. This sensor is constructed by cascading a single-mode fiber, a hollow core fiber, an air-clad photonic crystal fiber (APCF), and a polyimide microrod. The two mirrors of FPI are composed of the end faces of single-mode optical fiber and polyimide microrod (located on the end face of APCF). Thus, hollow core fiber thermal expansion will offset the change in FPI length caused by polyimide microrod thermal expansion, thereby achieving low temperature sensitivity. In contrast, an increase in humidity causes the polyimide microrod to absorb moisture and swell, resulting in a shortening of the FPI. Experimentally, the sensor’s humidity sensitivity between 30 % RH and 80 % RH and temperature sensitivity between 20 °C and 200 °C are 203.1 pm/% RH and 0.95 pm/°C, respectively. With a temperature cross-sensitivity as low as 0.0047 % RH/°C. This article provided a novel solution for achieving low temperature cross sensitivity in humidity sensors.

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基于耐热膨胀法布里-珀罗干涉仪的低温串扰湿度光纤传感器

我们提出了一种基于耐热膨胀法布里-佩罗干涉仪（FPI）的低温串扰光纤湿度传感器。该传感器由单模光纤、中空纤芯光纤、空气包覆光子晶体光纤（APCF）和聚酰亚胺微棒级联而成。FPI 的两个反射镜由单模光纤的端面和聚酰亚胺微镜（位于 APCF 的端面）组成。因此，中空芯光纤的热膨胀将抵消聚酰亚胺微棒热膨胀引起的 FPI 长度变化，从而实现低温度灵敏度。相反，湿度增加会导致聚酰亚胺微晶块吸湿膨胀，从而缩短 FPI。实验结果表明，传感器在 30%RH 和 80%RH 之间的湿度灵敏度以及在 20 °C 和 200 °C 之间的温度灵敏度分别为 203.1 pm/%RH 和 0.95 pm/°C。温度交叉灵敏度低至 0.0047 % RH/°C。这篇文章为实现湿度传感器的低温交叉灵敏度提供了一种新颖的解决方案。

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

Measurement 工程技术-工程：综合

CiteScore

10.20

自引率

12.50%

发文量

1589

审稿时长

12.1 months

期刊介绍： Contributions are invited on novel achievements in all fields of measurement and instrumentation science and technology. Authors are encouraged to submit novel material, whose ultimate goal is an advancement in the state of the art of: measurement and metrology fundamentals, sensors, measurement instruments, measurement and estimation techniques, measurement data processing and fusion algorithms, evaluation procedures and methodologies for plants and industrial processes, performance analysis of systems, processes and algorithms, mathematical models for measurement-oriented purposes, distributed measurement systems in a connected world.