一种光纤光栅振动与温度同时区分测量的解调方法

A FBG Simultaneous Measurement of Vibration and Temperature Demodulation Method

研究了一种可实现振动与温度同时区分测量的光纤光栅解调方法。利用放大自发辐射光源在1 530 nm附近有一段线性区做边缘滤波器进行滤波解调,用匹配光栅将传感器中的温度与振动信号区分开而实现两者的区分测量。实验证明了此方案的可靠性,解调系统的静态波长灵敏度为1 785.6 mV/nm,波长和温度的分辨力分别达到了0.56 pm和0.044℃。该解调系统结构简单、成本低、分辨率高,可以实现对温度与振动同时监测的工程应用。

A fiber grating demodulation method was studied for simukaneous discriminating measurement of vibration and temperature. The super-fluorescent fiber source has a good linear sideband near 1 530 nm,so we can make use of it to realize filtering demodulation. The temperature and vibration signal were separated and realized the distinction measurements. The scheme was proved dependability by the experiment. The system static wavelength sensitivity is 1785.6 mV/nm. The wavelength and temperature resolutions have reached 0.56 pm and 0. 044 ℃ seperately. The demodulation system has the simple structure, the temperature and vibration in engineering application. low cost, and high resolution. It can be used to monitor