应用放大自发辐射光源解调光纤光栅传感器

A FBG Sensor Demodulation Method Based on an Amplified Spontaneous Emission Light Source

提出一种利用放大的自发辐射(ASE)光源的单调下降边带对光栅光纤传感器进行解调的新方法。应用该方法构成的系统结构简单,不仅可以对静态参量进行测量,还能测量动态参量。由于系统中没有可移动部件,系统的高频响应特性好。应用该方法建立了温度和动态应变测量系统,实现了温度和动态应变的测量。该系统温度测量范围可达300℃。系统的最大优点是通过改变ASE的输出光强可对系统的动态范围和灵敏度进行调整。

A new demodulation method of fiber Bragg grating（FBG） sensing signal, which is by making use of the monotonic decline section of an amplified spontaneous emission （ASE） light source, is proposed. The setup of the system is simple according to the method. It can deal with not only static measurands, but also dynamic measurands. Because of there are no moving parts in it, its high frequency response is excellent. The systems are set up to measure temperature and dynamic strain according to the proposed method. The experiments on measuring temperature and dynamic strain are carried out. Its temperature measuring range is about 300℃. One of the biggest advantages of the method is that the dynamic range and its sensitivity are adjustable through ASE light source output power.