Compact Fiber Fabry–Perot Sensors filled with PNIPAM hydrogel for highly Sensitive Relative Humidity Measurement

Ru-lei Xia; Juan Liu; Jiulin Shi; Xing-Dao He; Jinhui Yuan; Andrew R. Pike; Liang Chu; Qiang Wu; Bin Liu

doi:10.1016/j.measurement.2022.111781

Compact Fiber Fabry–Perot Sensors filled with PNIPAM hydrogel for highly Sensitive Relative Humidity Measurement

Ru-lei Xia, Juan Liu, Jiulin Shi, Xing-Dao He, Jinhui Yuan, Andrew R. Pike, Liang Chu, Qiang Wu, Bin Liu

Mathematics, Physics and Electrical Engineering

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

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Abstract

A fiber-optic Fabry–Perot (FP) based relative humidity (RH) sensor was proposed and experimentally investigated by using Poly(N-isopropylacrylamide) (PNIPAM) hydrogel to connect two ends of single-mode optical fiber to formulate a PNIPAM FP cavity. The water vapor will be absorbed by the PNIPAM hydrogel, which will alter both the refractive index (RI) and dimension of the PNIPAM FP cavity, resulting in the change of output resonance intensity in the reflective spectrum. The measure RH sensitivity is 1.634 nm/%RH within RH range from 45-75% with good linearity of 0.9897 and excellent repeatability. The influence of PNIPAM hydrogel concentration on the RH sensitivity has been investigated - the higher the concentration of PNIPAM hydrogel, the higher the RH sensitivity of the sensor. The developed sensor can effectively monitor human respiratory with response and recovery time of 0.91 s and 1.91 s, respectively.

Original language	English
Article number	111781
Number of pages	8
Journal	Measurement
Volume	201
Early online date	20 Aug 2022
DOIs	https://doi.org/10.1016/j.measurement.2022.111781
Publication status	Published - 30 Sept 2022

Keywords

Fabry-Perot interferometer (FPI)
Fiber-optic sensor
PNIPAM hydrogel
Relative humidity (RH)

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10.1016/j.measurement.2022.111781

Revised manuscript with changes markedAccepted author manuscript, 4.15 MBLicence: CC BY-NC-ND

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title = "Compact Fiber Fabry–Perot Sensors filled with PNIPAM hydrogel for highly Sensitive Relative Humidity Measurement",

abstract = "A fiber-optic Fabry–Perot (FP) based relative humidity (RH) sensor was proposed and experimentally investigated by using Poly(N-isopropylacrylamide) (PNIPAM) hydrogel to connect two ends of single-mode optical fiber to formulate a PNIPAM FP cavity. The water vapor will be absorbed by the PNIPAM hydrogel, which will alter both the refractive index (RI) and dimension of the PNIPAM FP cavity, resulting in the change of output resonance intensity in the reflective spectrum. The measure RH sensitivity is 1.634 nm/%RH within RH range from 45-75% with good linearity of 0.9897 and excellent repeatability. The influence of PNIPAM hydrogel concentration on the RH sensitivity has been investigated - the higher the concentration of PNIPAM hydrogel, the higher the RH sensitivity of the sensor. The developed sensor can effectively monitor human respiratory with response and recovery time of 0.91 s and 1.91 s, respectively.",

keywords = "Fabry-Perot interferometer (FPI), Fiber-optic sensor, PNIPAM hydrogel, Relative humidity (RH)",

author = "Ru-lei Xia and Juan Liu and Jiulin Shi and Xing-Dao He and Jinhui Yuan and Pike, {Andrew R.} and Liang Chu and Qiang Wu and Bin Liu",

note = "Funding information: This work was jointly supported by the Natural Science Foundation of Jiangxi Province (20212BAB202024), National Natural Science Foundation of China (NSFC) (11864025, 62163029, 62175097 and 62065013). Nanchang Hangkong University graduate student innovation special fund project (Grant No. YC2021-074).",

year = "2022",

month = sep,

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doi = "10.1016/j.measurement.2022.111781",

language = "English",

volume = "201",

journal = "Measurement",

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TY - JOUR

T1 - Compact Fiber Fabry–Perot Sensors filled with PNIPAM hydrogel for highly Sensitive Relative Humidity Measurement

AU - Xia, Ru-lei

AU - Liu, Juan

AU - Shi, Jiulin

AU - He, Xing-Dao

AU - Yuan, Jinhui

AU - Pike, Andrew R.

AU - Chu, Liang

AU - Wu, Qiang

AU - Liu, Bin

N1 - Funding information: This work was jointly supported by the Natural Science Foundation of Jiangxi Province (20212BAB202024), National Natural Science Foundation of China (NSFC) (11864025, 62163029, 62175097 and 62065013). Nanchang Hangkong University graduate student innovation special fund project (Grant No. YC2021-074).

PY - 2022/9/30

Y1 - 2022/9/30

N2 - A fiber-optic Fabry–Perot (FP) based relative humidity (RH) sensor was proposed and experimentally investigated by using Poly(N-isopropylacrylamide) (PNIPAM) hydrogel to connect two ends of single-mode optical fiber to formulate a PNIPAM FP cavity. The water vapor will be absorbed by the PNIPAM hydrogel, which will alter both the refractive index (RI) and dimension of the PNIPAM FP cavity, resulting in the change of output resonance intensity in the reflective spectrum. The measure RH sensitivity is 1.634 nm/%RH within RH range from 45-75% with good linearity of 0.9897 and excellent repeatability. The influence of PNIPAM hydrogel concentration on the RH sensitivity has been investigated - the higher the concentration of PNIPAM hydrogel, the higher the RH sensitivity of the sensor. The developed sensor can effectively monitor human respiratory with response and recovery time of 0.91 s and 1.91 s, respectively.

AB - A fiber-optic Fabry–Perot (FP) based relative humidity (RH) sensor was proposed and experimentally investigated by using Poly(N-isopropylacrylamide) (PNIPAM) hydrogel to connect two ends of single-mode optical fiber to formulate a PNIPAM FP cavity. The water vapor will be absorbed by the PNIPAM hydrogel, which will alter both the refractive index (RI) and dimension of the PNIPAM FP cavity, resulting in the change of output resonance intensity in the reflective spectrum. The measure RH sensitivity is 1.634 nm/%RH within RH range from 45-75% with good linearity of 0.9897 and excellent repeatability. The influence of PNIPAM hydrogel concentration on the RH sensitivity has been investigated - the higher the concentration of PNIPAM hydrogel, the higher the RH sensitivity of the sensor. The developed sensor can effectively monitor human respiratory with response and recovery time of 0.91 s and 1.91 s, respectively.

KW - Fabry-Perot interferometer (FPI)

KW - Fiber-optic sensor

KW - PNIPAM hydrogel

KW - Relative humidity (RH)

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U2 - 10.1016/j.measurement.2022.111781

DO - 10.1016/j.measurement.2022.111781

M3 - Article

VL - 201

JO - Measurement

JF - Measurement

M1 - 111781

ER -

Compact Fiber Fabry–Perot Sensors filled with PNIPAM hydrogel for highly Sensitive Relative Humidity Measurement

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Keywords

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