title: Real-time monitoring the change process of liquid concentration using tilted fiber Bragg grating.
abstract: 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%.
authors: Shaanxi Key Laboratory of Optical Information Technology, Ministry of Education, School of Science, Northwestern Polytechnical University, Xi’ an 710072, China.
authors: Biqiang
authors: B
authors: Jiang
authors: Jianlian
authors: J
authors: Zhao
authors: Zhao
authors: Z
authors: Huang
authors: Abdul
authors: A
authors: Rauf
authors: Chuan
authors: C
authors: Qin