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Regular | Open Access

Humidity Sensor Based on a Hollow Core Fiber Anti-Resonant Reflection Optical Waveguide

Ao CHENG1,2, Chaoqi WANG1,2, Jiadong XU1,2, Peiqing ZHANG1,2,3, Yu ZHENG4, Shixun DAI1,2,3( )
Laboratory of Infrared Material and Devices, Advanced Technology Research Institute, Ningbo University, Ningbo 315211, China
Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province, Ningbo 315211, China
Engineering Research Center for Advanced Infrared Photoelectric Materials and Devices of Zhejiang Province, Ningbo University, Ningbo 315211, China
Ifiber (Ningbo) Optoelectronics Technology Co., Ltd., Ningbo 315211, China
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Abstract

In this paper, a graphene oxide (GO) composite film-coated humidity sensor is proposed based on the hollow core fiber (HCF). A segment of the HCF is spliced between two segments of the single-mode fiber (SMF). The relative humidity (RH) sensing characteristics of the sensor are experimentally investigated by observing the intensity shift of resonant dips in the transmission spectrum, which shows the GO composite film-coated HCF has the good stability in the measurement of humidity. The maximum humidity sensitivity of 0.12 dB/%RH is obtained in the RH range of 30%–78%. The proposed sensor has the advantages of the simple structure, easy fabrication, good stability, and high performance, which can be applied to marine climate detection, tunnel air humidity detection, agricultural testing, and other fields.

Keywords

Humidity sensinghollow core fiberanti-resonant refection optical waveguidegraphene oxide

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Photonic Sensors
Volume 15 Issue 2,
June 2025
DOI: 10.1007/s13320-025-0749-1

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Cite this article:
CHENG A, WANG C, XU J, et al. Humidity Sensor Based on a Hollow Core Fiber Anti-Resonant Reflection Optical Waveguide. Photonic Sensors, 2025, 15(2). https://doi.org/10.1007/s13320-025-0749-1

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Received: 04 January 2024
Revised: 27 June 2024
Published: 01 June 2025
© The Author(s) 2025.

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.