基于超声脉冲激励的光纤光栅复用技术

Fiber grating multiplexing technology based on ultrasonic pulse excitation

为了提高光纤光栅传感网络的信息传递密度与容量,提出基于超声脉冲激励的光纤光栅复用技术,并进行实验分析,通过将超声脉冲激励分别导入单光栅与光栅串中,使单光栅、光栅串发生啁啾。实验结果表明:单光栅实验中,超声脉冲使光栅降低其相对反射率;光栅串实验中,超声脉冲使其中一个光栅相对反射率下降时,其余光栅相对反射率上升,能有效分离3个光谱相近的光栅。

In order to improve the information transmission density and capacity of fiber Bragg grating sensing networks,a fiber Bragg grating multiplexing technology based on ultrasonic pulse excitation is proposed and experimental analysis is conducted.By introducing ultrasonic pulse excitation into a single grating and a grating string respectively,chirping occurs in the single grating and grating string.The experimental results indicate that in the single grating experiment,ultrasonic pulses reduce the relative reflectivity of the grating.In the grating string experiment,when the ultrasonic pulse causes the relative reflectance of one grating to decrease,the relative reflectance of the other gratings increases,which can effectively separate three gratings with similar spectra.