一种新型光纤布喇格光栅振动传感器研究

Design Research of Fiber Bragg Grating Accelerometer

为适合土木工程实际所需,提出了一种新型的、可放大振动信号、工作频带宽的光纤光栅低频加速度传感器.进行了参量优化设计,并在不同阻尼情况下进行了灵敏度、线性度、横向抗干扰和幅频特性等性能试验.试验结果表明:所设计的光纤光栅振动传感器方案是可行的;其线性度好,抗横向干扰能力强,通过合理调整阻尼,灵敏度可达到90 pm/ms-2,上限工作频率可取在系统无阻尼固有频率的80%左右.

For the application in civil engineering filed,a novel FBG accelerometer design concept, which can amplify the signal amplitude and broaden the range of working frequency, is presented. An optimal design is conducted. Finally, some performance tests are performed to evaluate the sensitivity, linearity, transverse anti-jamming ability and amplitude-frequency characteristic of the prototype FBG accelerometer with different damping. The result shows that the design concept is feasible and the sensitivity and the upper limit working frequency are respectively up to 90 pm/ms^-2 and about 80% of no-damping initial frequency.