Humidity and temperature sensor based on GOQDs-PVA coated tapered no-core fiber combined with FBG
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Vol.16 No.6, 1 November 2020
Humidity and temperature sensor based on GOQDs-PVA coated tapered no-core fiber combined with FBG* CHENG Qi-hang (〻㡚), ZHANG Ai-ling (ᕐ⡡⧢)**, PAN Hong-gang (█⍚ࡊ), LI Wen (ᵾ䴟), and SUN Ce (ᆉㆆ) Tianjin Key Laboratory of Film Electronic and Communication Devices, Engineering Research Center of Communication Devices and Technology, Ministry of Education, School of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin 300384, China1 (Received 17 December 2019; Revised 3 February 2020) ©Tianjin University of Technology and Springer-Verlag GmbH Germany, part of Springer Nature 2020 A simple structure optical fiber sensor for relative humidity (RH) and temperature measurement is proposed and verified in this paper, which is based on graphene oxide quantum dots and polyvinyl alcohol (GOQDs-PVA) composite coated tapered no-core fiber (NCF) combined with a fiber Bragg grating (FBG). FBG is insensitive to humidity and sensitive to temperature, which is used to compensate temperature of the sensor. Experimental results show this sensor has humidity sensitivity of 143.27 pm/%RH ranging from 30%RH to 80%RH and the temperature sensitivity of 9.21 pm/ć. The proposed sensor has advantages of simple structure, good repeatability, and good stability, which is expected to be used in both RH and temperature measurement in biological and chemical fields. Document code: A Article ID: 1673-1905(2020)06-0428-5 DOI https://doi.org/10.1007/s11801-020-9215-x
The measurement of relative humidity (RH) is of great importance in many fields, such as air quality, food manufacturing, grain storage, precision instrument laboratory and so on[1-4]. Traditional electronic humidity sensors are sensitive to electromagnetic environment[5]. Compared with the traditional electronic RH sensors, optical fiber sensor has attracted extensive attention due to the electromagnetic field insensitive property, also other characteristics of compact size, low cost, high sensitivity and long-distance sensing[6,7]. Refractive index (RI) sensitive optical fiber sensors, such as long period grating (LPG), tilted fiber Bragg grating (TFBG), Mach-Zehnder interferometer (MZI), can be used for humidity sensing by combining with different types of moisture-sensitive materials to obtain high sensitivity, wide detection range, and fast response. These moisture-sensitive materials, such as agarose[8], polyvinyl alcohol (PVA)[9], chitosan[10], etc., will change their RIs with the variation of environmental humidity. In 2016, Shengnan Wu et al[11] presented a PVA coated FPI sensor in the field of relative humidity sensing. Sensitivity of 0.023 nm/%RH is achieved in the range of 30%RH—90%RH. In 2018, Ruijie Tong et al[12] proposed a humidity sensor based on graphene quantum dots and polyvinyl alcohol (GQDs-PVA) coated small up-tapered photonic crystal fiber MZI, the sensitivity is 0.090 1 nm/%RH. In order to further improve for the RH sensitivity, Yaoming Huang et al[13] demonstrated the structure of a side polished fiber hum
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