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针对泥石流地声的特性,设计了一种悬臂梁结构的光纤布拉格光栅(FBG)加速度传感器。理论分析了FBG传感器灵敏度、谐振频率的影响因素,对传感器的关键参数进行了优化设计;引入抗弯光纤、高分子超薄涂覆以及CCD解调等新技术,改善传感器的灵敏度、串接复用等性能;最后进行了对比测试。实验结果表明:所设计的传感器灵敏度高达400pm/g,固有频率为310Hz,能很好地满足泥石流地声监测的要求。
Aiming at the characteristics of debris flow acoustic noise, a fiber Bragg grating (FBG) accelerometer with cantilever structure was designed. The factors that affect the sensitivity and resonant frequency of FBG sensor are analyzed theoretically, and the key parameters of the sensor are optimally designed. New technologies such as bend-resistant fiber, ultra-thin polymer coating and CCD demodulation are introduced to improve the sensitivity of the sensor. With other performance; the final comparison test. The experimental results show that the sensitivity of the designed sensor is up to 400pm / g and the natural frequency is 310Hz, which can well meet the requirements of acoustic monitoring of debris flow.