DBR光纤激光应变传感研究

Research on DBR Fiber Laser Strain Sensor

光纤激光器是一种信噪比很高的优质光源,具有光束质量好、窄线宽、高功率等优异的性能,将光纤激光器应用于传感,能弥补布拉格光栅传感的不足.通过利用光纤激光器构成的光纤激光传感器与光纤布拉格光栅传感器相比较,进行应变传感实验研究.实验结果说明光纤激光器型传感器具有更高信噪比和输出功率.与传统的布拉格光栅比较,输出信号的功率增大了23dB,信噪比得到19dB的提高.线宽减少了约1/5.

The optic fiber laser is a high-quality light source with a high signal-to-noise ratio, and other ex- cellent performance such as good light with beam, narrow linewidth and high power. Applying fiber sensor based on the optic fiber laser can make up the shortage of a laser FBG sensor. The properties of stress for FBG sensor and a fiber sensor based on the DBR fiber laser have been studied experimentally. Results show that the optic fiber laser sensor has high signal-to-noise ratio and output power. Comparing with a conventional passive system, its optical signal power and SN ratio were enhanced to 23dB and 19dB, and the line- width was reduced to 1/5.