研究了一种基于Lissajous图形的光纤分布式扰动传感器定位方法。光纤分布式扰动传感器基于Mach-Zehnder干涉仪，通过两路输出信号的时延得到扰动定位。在两路输出信号的Lissajous图形中构造拟合椭圆，基于实验数据的仿真研究表明：通过...研究了一种基于Lissajous图形的光纤分布式扰动传感器定位方法。光纤分布式扰动传感器基于Mach-Zehnder干涉仪，通过两路输出信号的时延得到扰动定位。在两路输出信号的Lissajous图形中构造拟合椭圆，基于实验数据的仿真研究表明：通过椭圆半短轴长可以得到时延，实现定位。法进行了仿真和实验研究，在无需噪声抑制的条件下定位精度较高：在信噪比为-6~7dB范围，最大定位误差为207 m 多次测量中，最大误差为94 m。研究结论可以为光纤分布式扰动传感器定位方法提供新的技术参考。展开更多
In this paper,a novel highly sensitive methane(CH4)and acetylene(C2H2)dual-gas light-induced thermoelectric spectroscopy(LITES)sensor based on Lissajous space-division multiplexed(LSDM)technology and trapezoidal-head ...In this paper,a novel highly sensitive methane(CH4)and acetylene(C2H2)dual-gas light-induced thermoelectric spectroscopy(LITES)sensor based on Lissajous space-division multiplexed(LSDM)technology and trapezoidal-head quartz tuning fork(QTF)detector was reported for the first time.A theoretical LSDM model was established on the basis of three-mirror astigmatic multi-pass cell(MPC)and it was used to design a pair of Lissajous spot patterns with optical path length to volume ratios(OPL/Vs)of 13.5 cm^(-2) and 13.3 cm^(-2),respectively.Two self-designed trapezoidal-head QTFs with low resonant frequencies of less than 10 kHz and quality factor of~12000 were adopted to enhance the detection ability.Two kinds of fiber amplifier,erbium doped fiber amplifier(EDFA)and Raman fiber amplifier(RFA),were combined to amplify the output power of two diode lasers to improve the excitation strength.After optimization,minimum detection limit(MDL)of 268.8 ppb and 91.4 ppb for real-simultaneous CH4 and C2H2 sensing were obtained,respectively.When the integration time of the system were 150 s and 100 s,the MDLs could be improved to 54.8 ppb and 26.1 ppb,accordingly.Further improvement methods for such sensor were discussed.展开更多
文摘研究了一种基于Lissajous图形的光纤分布式扰动传感器定位方法。光纤分布式扰动传感器基于Mach-Zehnder干涉仪，通过两路输出信号的时延得到扰动定位。在两路输出信号的Lissajous图形中构造拟合椭圆，基于实验数据的仿真研究表明：通过椭圆半短轴长可以得到时延，实现定位。法进行了仿真和实验研究，在无需噪声抑制的条件下定位精度较高：在信噪比为-6~7dB范围，最大定位误差为207 m 多次测量中，最大误差为94 m。研究结论可以为光纤分布式扰动传感器定位方法提供新的技术参考。
基金National Natural Science Foundation of China(Grant No.62335006,62022032,62275065,and 61875047)Key Laboratory of Opto-Electronic Information Acquisition and Manipulation(Anhui University),Ministry of Education(Grant No.OEIAM202202)Fundamental Research Funds for the Central Universities(Grant No.HIT.OCEF.2023011).
文摘In this paper,a novel highly sensitive methane(CH4)and acetylene(C2H2)dual-gas light-induced thermoelectric spectroscopy(LITES)sensor based on Lissajous space-division multiplexed(LSDM)technology and trapezoidal-head quartz tuning fork(QTF)detector was reported for the first time.A theoretical LSDM model was established on the basis of three-mirror astigmatic multi-pass cell(MPC)and it was used to design a pair of Lissajous spot patterns with optical path length to volume ratios(OPL/Vs)of 13.5 cm^(-2) and 13.3 cm^(-2),respectively.Two self-designed trapezoidal-head QTFs with low resonant frequencies of less than 10 kHz and quality factor of~12000 were adopted to enhance the detection ability.Two kinds of fiber amplifier,erbium doped fiber amplifier(EDFA)and Raman fiber amplifier(RFA),were combined to amplify the output power of two diode lasers to improve the excitation strength.After optimization,minimum detection limit(MDL)of 268.8 ppb and 91.4 ppb for real-simultaneous CH4 and C2H2 sensing were obtained,respectively.When the integration time of the system were 150 s and 100 s,the MDLs could be improved to 54.8 ppb and 26.1 ppb,accordingly.Further improvement methods for such sensor were discussed.
