TITLE:
Characteristics Analysis of Chemical Concentration Sensor Based on Three-layer FBG
AUTHORS:
Zhaoxia Wu, Xinyan Yu, Erdan Gu, Zhi Kong, Wenchao Li
KEYWORDS:
Fiber Bragg grating(FBG); Three-layer Structure; Refractive Index; Concentration of Solution; Chemical Sensor
JOURNAL NAME:
Optics and Photonics Journal,
Vol.3 No.2B,
July
22,
2013
ABSTRACT: The three-layer structure
model of the fiber Bragg grating is proposed in this paper. And through
experimental study and reasoning calculation to verify the three layer
structure of the optical waveguide model, so the sensitivity characteristic
of the Bragg wavelength to the refractive index of chemical solution is
obtained. And the relationships between the concentration and the shift of
Bragg wavelength of sucrose, ethanol, and Nacl solution are achieved. Finally
the shifts of the Bragg wavelength with the
external concentration are obtained by experiments. A
kind of simple structure, small size, good stability, high sensitivity chemical
concentration sensor is obtained.