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为了提高检测分辨率和运行稳定性,研究了一种基于解调技术的光纤激光传感器。光纤激光传感器选用分布式布拉格反射结构,详细介绍了光纤激光传感器原理和光纤激光传感器高分辨率解调原理,依据干涉式传感原理对干涉信号的相位改变情况进行检测,获取受外界信号影响导致的激光器腔长的应变。给出设计的光纤激光传感器结构。通过波分复用器对光纤激光器形成的稳定窄线宽单频激光进行处理,删除抽运光。激光从波分复用器输出后接入光隔离器,通过1×2耦合器把激光划分成两束,将其中的一束接入光谱仪进行测试,将另一束添加至非平衡干涉仪。介绍了由3×3耦合器组成的迈克尔逊干涉仪,以3路输出的NPS方法和反正切方法为代表完成研究。实验结果表明,研究的基于解调技术的光纤激光传感器稳定性很高。
In order to improve the detection resolution and operational stability, a fiber laser sensor based on demodulation technology is studied. The fiber laser sensor adopts the distributed Bragg reflection structure. The principle of the fiber laser sensor and the principle of high-resolution fiber laser sensor are introduced in detail. According to the principle of the interferometric sensor, the phase change of the interference signal is detected. The length of the laser cavity strain. The designed fiber laser sensor structure is given. Wavelength-division multiplexer is used to process stable narrow line width single-frequency laser formed by fiber laser to remove the pumping light. The laser is fed from the WDM output to an optical isolator. The laser is split into two beams by a 1 × 2 coupler, one of which is connected to the spectrometer for testing, and the other to the unbalanced interferometer. The Michelson interferometer composed of 3 × 3 couplers is introduced. The NPS method and the arc tangent method with 3 outputs are used as the representative to complete the research. Experimental results show that the fiber laser sensor based on demodulation technology is highly stable.