Simultaneous Measurement of Temperature and Strain Using a Single Bragg Grating in a Few-Mode Polymer Optical Fiber

Author

Weiwei Qiu ; Xusheng Cheng ; Yanhua Luo ; Qijin Zhang ; Bing Zhu

Author_Institution

Dept. of Electron. Eng. & Inf. Sci., Univ. of Sci. & Technol. of China, Hefei, China

Volume

31

Issue

14

fYear

2013

fDate

41470

Firstpage

2419

Lastpage

2425

Abstract

A few-mode polymer optical fiber (POF) with a highly photosensitive core doped with benzil dimethyl ketal (BDK) was fabricated and used to write a Bragg grating using the modified Sagnac optical interference technique. Bragg gratings formed in the few-mode POF show multiple reflection peaks. The response characteristics of the temperature and the strain of the few-mode POF Bragg grating (POFBG) were theoretically analyzed and experimentally verified. The results show almost the same strain response but a different temperature response for all guided modes in the few-mode POFBG. A new method of measuring temperature and strain simultaneously was proposed and demonstrated experimentally by using a single few-mode POFBG.

Keywords

Bragg gratings; doping; fibre optic sensors; infrared spectra; light interference; optical fibre fabrication; optical fibre theory; optical polymers; reflectivity; strain measurement; strain sensors; temperature measurement; temperature sensors; BDK doping; POFBG; benzil dimethyl ketal; few-mode polymer optical fiber; guided modes; modified Sagnac optical interference technique; photosensitive core; reflection; single Bragg grating; single few-mode POF Bragg grating; strain measurement; strain response; temperature measurement; temperature response; Fiber gratings; Optical fibers; Polymers; Strain; Temperature measurement; Temperature sensors; Few-mode fiber; fiber Bragg grating; optical fiber sensor; polymer optical fiber; strain; temperature;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2013.2266791

Filename

6525393