抗干扰的光纤光栅边缘滤波解调技术研究

FBG Filter Brim Demodulation Technology for Resisting Interferences

针对传统的光纤光栅边缘滤波解调系统中需使用双光功率计接收信号,而光功率计各自噪声的随机性,导致光功率计的噪声干扰无法消除的问题,利用光开关在光电接收处只使用单光功率计,达到解调并消除噪声干扰的目的,最终提高光纤光栅边缘滤波解调技术的抗噪声干扰能力。将该改进应用到悬臂梁拉力测试实验中,抗噪声干扰效果显著,可以避免使用复杂的波长解调设备,结构简单,有望在工程实践中获得实际应用。

In traditional system of FBG filter brim demodulation,two optical power meters are necessary to receive signal.Because of randomicity of noise of each optical power meter,interferences of noise from optical power meters cannot be eliminated.Using optical switch in the photoelectric receiver can make it possible that only one optical power meter is needed,which is convenient for eliminating interferences of noise.The noise immunity of FBG filter brim demodulation is then enhanced.Use this technology in the experiment of cantilever beam,the noise immunity works well.The technology,which doesn′t need expensive complex wavelength demodulation equipments,has promising applications in engineering practice.