An Optical Solution Concentration Sensor Based on Periodical Pressure-Induced Long-Period Fiber Gratings

Author

Shi, Shenghui ; Zhou, Xiaojun ; Zhang, Zhiyao ; Yin, Cong ; Liu, Yong

Author_Institution

State Key Lab. of Electron. Thin Films & Integrated Devices, Univ. of Electron. Sci. & Technol. of China, Chengdu, China

fYear

2012

fDate

21-23 May 2012

Firstpage

1

Lastpage

4

Abstract

A fiber-optic solution concentration sensor employing a periodical pressure-induced long-period grating is proposed. The sensor is based on a composite optical waveguide which is made of a standard single-mode fiber, a Teflon-cannula and the medium under test. Experiment has been carried out to measure the concentration of the sodium chloride (NaCl) solution. The results show that the central resonance wavelength shift has an approximately linear relationship with the concentration of the NaCl solution, where a sensitivity of 0.128 nm/wt.% for the LP14 mode coupling in a concentration range from 0% to 25% is measured.

Keywords

chemical variables measurement; composite materials; diffraction gratings; fibre optic sensors; sodium compounds; NaCl; Teflon-cannula; central resonance wavelength shift; composite optical waveguide; concentration measurement; fiber-optic solution concentration sensor; linear relationship approximation; medium under test; periodical pressure-induced long-period fiber gratings; single-mode fiber; Optical fiber sensors; Optical fibers; Optical refraction; Refractive index;

fLanguage

English

Publisher

ieee

Conference_Titel

Photonics and Optoelectronics (SOPO), 2012 Symposium on

Conference_Location

Shanghai

ISSN

2156-8464

Print_ISBN

978-1-4577-0909-8

Type

conf

DOI

10.1109/SOPO.2012.6270941

Filename

6270941