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Liu T.-G.,Tianjin University | Liu T.-G.,Key Laboratory of Opto electronics Information Technical | Liu K.,Tianjin University | Liu K.,Key Laboratory of Opto electronics Information Technical | And 4 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

The sensitivity is an important issue for intra-cavity absorption gas sensors (ICAGS). In this paper, the ICAGS based on erbium-doped fiber ring lasers (EDFRL) are modeled using propagation equations, from which the expressions of the signal-to-noise ratio (SNR) and the sensitivity of the system are deduced. The influence of the pump power and the total attenuation of the system on the performance of the ICAGS are simulated theoretically and measured experimentally. The absorption signal of acetylene is detected by adjusting the state of the system. And concentration calibration of acetylene is realized finally. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).


Liu T.G.,Tianjin University | Liu T.G.,Key Laboratory of Opto electronics Information Technical | Liang X.,Tianjin University | Liang X.,Key Laboratory of Opto electronics Information Technical | And 6 more authors.
Optics Communications | Year: 2012

The absorbance enhancement of multiple gas absorption lines is investigated by simulations and experiments in this paper. The relationship between cavity loss and gas absorbance of different absorption lines is simulated based on rate equation. For the purpose of using simple arithmetic mean instead of weighted arithmetic mean in calculating gas concentration by multiple absorption lines, the absorbance equality method is proposed and simulated. To verify the simulations, some experiments were carried out based on the intra-cavity fiber ring laser (ICFRL) gas sensing system. The experimental results of absorbance enhancement extremely match to the simulation results. More than 40 C 2H 2 absorption lines can be observed and a minimum detectable C 2H 2 concentration of 200 ppm is acquired according to the experiments. © 2012 Elsevier B.V. All rights reserved.


Li D.,Tianjin University | Li D.,Key Laboratory of Opto electronics Information Technical | Jiang J.,Tianjin University | Jiang J.,Key Laboratory of Opto electronics Information Technical | And 6 more authors.
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2011

A real-time measurement of the strain system based on the principle of Fiber Bragg grating sensors is built in this dissertation. The strain calibration experiments are also conducted. The system has been successfully applied in the strain monitoring of dam sluice model, which is provided by the Hydraulic Institute of Tianjin University. The monitoring results show that the strain monitoring system has good stability and high measurement sensitivity, which provide a reference for the application of Fiber Bragg grating in the water model.

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