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设计了一种安装于双圆柱弹性环内并由多条弹性薄片条组装成的桶形骨架作为光纤Bragg光栅(FBG)振动传感器基底的传感结构,振动传感器的谐振频率为440Hz,加速度灵敏度约为76.4pm/g,采用相位载波调制式FBG振动传感器解调系统进行解调。实验结果表明,本文传感器经双圆柱弹性环对横向振动约束处理后,其幅频特性在20～300Hz频率范围内呈现出平坦的水平直线,对应于位相角φ=0处的相频特性曲线也呈现出平坦的水平直线,适合于工程技术中20～300Hz的振动信号实时检测。
A barrel-shaped skeleton mounted in a double cylindrical elastic ring and assembled by a plurality of elastic thin strips is designed as a sensor structure of a fiber Bragg grating (FBG) vibration sensor. The vibration frequency of the vibration sensor is 440 Hz, and the acceleration sensitivity is about Is 76.4pm / g, using phase carrier modulation FBG vibration sensor demodulation system for demodulation. The experimental results show that the amplitude-frequency characteristic of the sensor in this paper has a flat horizontal line in the frequency range from 20 Hz to 300 Hz after the constraint of the lateral vibration of the double cylindrical elastic ring, corresponding to the phase-frequency characteristic curve at the phase angle φ = 0 Showing a flat horizontal straight line, suitable for engineering technology 20 ~ 300Hz vibration signal real-time detection.