放大自发辐射宽带光源(ASE)谱特性FBG动态解调方法的研究

The study on Amplified Spontaneous Emission Broadband Light(ASE) Spectrum Characteristic FBG dynamic demodulation methods

本文应用超磁致伸缩材料(GMM)构建FBG的电流传感探头,与ASE光源谱特性解调系统共同组成了交流电流测量系统,对50Hz的交流电流进行测量,并通过温度解调传感实验先对ASE光源谱特性解调进行了定标。通过实验标定ASE光源谱特性解调应变灵敏度系数,最终将交流电流形成的布拉格波长漂移量解调成交变的电压信号输出。该信号与输入电流信号相对应,并且包含了输入电流信号的幅值、频率和相位信息。从示波器测得的输入和输出信号的相似性表明,实验结果与理论分析是一致的,验证了ASE光源谱特性动态解调方法的可行性。

A FBG current sensing probe was constructed with a GMM rod. An alternating current measuring system was established with an ASE light source and the probe and a measurement was carried out on 50Hz altemating current signal. Through the experiment of temper- ature sensing, the demodulation system was calibrated. The strain sensitivity coefficient of the demodulation system was calibrated through experiments. In the end, tile Bragg wavelength shift induced by alternating current was demodulated to the system output of alternating voltage. The output voltage is corresponding to the input current signal and it has the information of amplitude, phase and frequency of input signal. The similarity of the input - output signals of the system shows the coincidence of the theoretical analysis and the experiment results. Further, it verifies that the proposed demodulation method is realistic.