Open AccessReal-time monitoring the change process of liquid concentration using tilted fiber Bragg grating
Author(s) -
Biqiang Jiang,
Jianlian Zhao,
Zhao Huang,
Abdul Rauf,
Chuan Qin
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.015347
Subject(s) - fiber bragg grating , materials science , photodiode , demodulation , optics , voltage , grating , amplifier , optical fiber , optoelectronics , physics , computer science , telecommunications , channel (broadcasting) , cmos , quantum mechanics
We propose and experimentally demonstrate a demodulation technique for real-time monitoring the change process of liquid concentration based on a tilted fiber Bragg grating (TFBG) and differential amplification detection. Continuous variations of the TFBG transmission power are measured by using two photodiodes (or a precision reference voltage generator instead of the referenced photodiode) along with two integrated operational amplifier circuits (IOAC). The voltage-concentration curves are obtained, by recording the output voltages of the two IOACs at different time. The experimental results show that such a fast demodulation technique is capable of measuring the effective glycerol solution concentration over the range of about 89%~69%.