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Enlarged-taper tailored fiber Bragg grating with polyvinyl alcohol coating for humidity sensing
Zhejiang Univ, Ctr Opt & Electromagnet Res, State Key Lab Modern Opt Instrumentat, Zhejiang Prov Key Lab Sensing Technol, Hangzhou 310058, Zhejiang, Peoples R China..
Zhejiang Univ, Ctr Opt & Electromagnet Res, State Key Lab Modern Opt Instrumentat, Zhejiang Prov Key Lab Sensing Technol, Hangzhou 310058, Zhejiang, Peoples R China..
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. Zhejiang Univ, Ctr Opt & Electromagnet Res, State Key Lab Modern Opt Instrumentat, Zhejiang Prov Key Lab Sensing Technol, Hangzhou 310058, Zhejiang, Peoples R China.ORCID iD: 0000-0002-3401-1125
2015 (English)In: 2015 INTERNATIONAL CONFERENCE ON OPTICAL INSTRUMENTS AND TECHNOLOGY: OPTICAL SENSORS AND APPLICATIONS / [ed] Zhang, X Erickson, D Fan, X Chen, Z, SPIE-INT SOC OPTICAL ENGINEERING , 2015, article id 962007Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, a novel optical fiber sensor based on an enlarged-taper tailored fiber Bragg grating (FBG) is proposed and experimentally demonstrated for the measurement of relative humidity. The enlarged-taper works as a multifunctional joint that not only excites cladding modes but also recouples the cladding modes reflected by the FBG back into the leading single mode fiber. Due to the fact that cladding modes have a strong evanescent field penetrating into the ambient medium, the intensity of the reflected cladding modes is greatly influenced by the refractive index (RI) of the ambient medium. Polyvinyl alcohol (PVA) film is plated on the fiber surface by dip-coating technique, as a humidity-to-refractive index transducer, whose RI variance from 1.49 to 1.34 when the ambient humidity increases from 20%RH to 95%RH. The relative humidity response of the sensing structure is investigated in our home-made humidity chamber with a commercial hygrometer. By monitoring the intensity of the reflected cladding modes, the RH variance can be demodulated. Experimental results show that RH sensitivity depends on the RH value, and a sensitivity up to 1.2 dB/%RH can be achieved within the RH range of 30-90%. A fast and reversible time response has also been investigated. Such a probe-type and reusable fiber-optic RH sensor is a very promising technology for biochemical sensing applications, e.g., breath analysis, chemical reaction monitoring.

Place, publisher, year, edition, pages
SPIE-INT SOC OPTICAL ENGINEERING , 2015. article id 962007
Series
Proceedings of SPIE, ISSN 0277-786X ; 9620
Keywords [en]
Optical fiber sensor, relative humidity sensor, fiber Bragg grating, evanescent field, refractive index
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-272208DOI: 10.1117/12.2193414ISI: 000360391800007Scopus ID: 2-s2.0-84943379847ISBN: 978-1-62841-801-9 (print)OAI: oai:DiVA.org:kth-272208DiVA, id: diva2:1424833
Conference
International Conference on Optical Instruments and Technology - Optical Sensors and Applications, MAY 17-19, 2015, Beijing, PEOPLES R CHINA
Note

QC 20200420

Available from: 2020-04-20 Created: 2020-04-20 Last updated: 2020-05-11Bibliographically approved

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He, Sailing

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