基于可调谐激光器的复用传感系统的研究

基金项目:

北京市教委资助项目(00KG040);教育部博士点基金资助项目(20020055036);天津市自然科学基金重点资助项目(013800511)

详细信息

Study on the multiplexed sensor system based on tunable fiber laser with fiber Bragg grating

1.
Applied Science College, Beijing University of Technology, Beijing 100022, China;
2.
Institute of Modern Optics, Nankai University, Tianjin 300071, China

摘要: 为了克服复用传感系统中光源带宽及功率的制约,有效地扩大多点检测的范围,采用波分和时分复用传感技术,设计了可调谐光纤激光器作为传感系统的光源.基于耦合模方程的理论,对匹配光栅调谐光纤激光器波长扫描寻址解调方法进行了理论分析和实验研究.实验中采用可调谐光纤激光器对由4个光栅组成的两个光栅串成功地进行了波分和时分复用传感,实验获得的应变分辨率为2.9με/step.该传感系统具有经济实用性、信噪比高、可复用数目大等特点,对于多点检测的传感网络具有较大的实用价值.
- 光纤光栅 /
- 可调谐光纤激光器 /
- 阵列传感 /
- 波分和时分复用
Abstract: In order to overcome the limited bandwidth and the weak power of the laser and enlarge the range of the multi-point detection effectively,a tunable fiber laser is designed and used as the source of optical sensor system with WDM and TDM technique.Based on the mode couple theory,using a stepper motor to tune the wavelength of FBG to scan the fiber laser demodulation is analyzed theoretically and studied experimentally.Strain resolution of about 2.9με/step is obtained.The system has high signal-to-noise ratio and can multiplex a large number of FBGs,which is economical and practical in sensor array system.
- fiber Bragg grating(FBG) /
- tunable fiber laser /
- sensor array /
- wavelength-and-time-division multiplexing

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