基于琼脂糖凝胶膜包覆的无芯光纤的相对湿度传感器

Relative Humidity Sensor Based on No-Core Fiber Coated by Agarose-Gel Film.

作者信息

Xu Wei, Shi Jia, Yang Xianchao, Xu Degang, Rong Feng, Zhao Junfa, Yao Jianquan

机构信息

Institute of Laser and Optoelectronics, College of Precision Instrument and Optoelectronic Engineering, Tianjin University, Tianjin 300072, China.

Key Laboratory of Optoelectronic Information Science and Technology (Ministry of Education), Tianjin University, Tianjin 300072, China.

出版信息

Sensors (Basel). 2017 Oct 16;17(10):2353. doi: 10.3390/s17102353.

DOI:10.3390/s17102353

PMID:29035290

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5677245/

Abstract

A relative humidity (RH) sensor based on single-mode-no-core-single-mode fiber (SNCS) structure is proposed and experimentally demonstrated. The agarose gel is coated on the no-core fiber (NCF) as the cladding, and multimode interference (MMI) occurs in the SNCS structure. The transmission spectrum of the sensor is modulated at different ambient relative humidities due to the tunable refractive index property of the agarose gel film. The relative humidity can be measured by the wavelength shift and intensity variation of the dip in the transmission spectra. The humidity response of the sensors, coated with different concentrations and coating numbers of the agarose solution, were experimentally investigated. The wavelength and intensity sensitivity is obtained as -149 pm/%RH and -0.075 dB/%RH in the range of 30% RH to 75% RH, respectively. The rise and fall time is tested to be 4.8 s and 7.1 s, respectively. The proposed sensor has a great potential in real-time RH monitoring.

摘要

提出并通过实验验证了一种基于单模-无芯-单模光纤（SNCS）结构的相对湿度（RH）传感器。将琼脂糖凝胶涂覆在无芯光纤（NCF）上作为包层，在SNCS结构中会发生多模干涉（MMI）。由于琼脂糖凝胶膜的可调折射率特性，传感器的传输光谱在不同的环境相对湿度下受到调制。相对湿度可以通过传输光谱中凹陷处的波长偏移和强度变化来测量。实验研究了涂覆不同浓度和涂覆层数琼脂糖溶液的传感器的湿度响应。在30%RH至75%RH范围内，波长和强度灵敏度分别为-149 pm/%RH和-0.075 dB/%RH。上升时间和下降时间分别测试为4.8 s和7.1 s。所提出的传感器在实时RH监测方面具有很大的潜力。