【摘要】 研制了一种新型光纤加速度传感器。基于迈克尔逊干涉仪原理,采用了质量块和可弯曲簧片结构,通过使用竖直绕制传感光纤和横向绕制参考光纤的方式提高了加速度传感器的加速度灵敏度。实验测试了其加速度灵敏度以及横向串扰。在簧片厚为1 mm、质量块质量为208g时,其加速度灵敏度可达556rad/g(g为重力加速度);在噪声本底为10-4rad/(1/2Hz)、加速度传感器工作频率为100Hz时,其可探测的最小加速度信号为200ng/(1/2Hz)(g为重力加速度)。采用该全金属结构,传感器可更好地用于微弱信号检测。更多还原

【Abstract】 In order to realize a high acceleration sensitivity,we propose a novel all-metal fiber-optic accelerometer based on Michelson interferometric configuration and using flexible reed structure,by winding sensing arm in axial direction and reference arm in transverse direction to improve the accelerometer′s energy conversion efficiency to enhance acceleration sensitivity.Meanwhile,such a structure can decrease the interference between the sensing and reference arms.In this paper,the fundamental principle and the design of the novel sensor are introduced respectively,and the acceleration sensitivity and resonance frequency of this sensor are analyzed theoretically.The acceleration sensitivity and crosstalk are measured by an experiment.When the thickness of the reed is 1 mm and the quality of the mass is 208 g,the acceleration sensivity of the accelerometer is 556 rad/g(54.9 dB).A method is proposed to improve the accelereation sensitivity.Moreover,the crosstalk of the accelerometer is studied and the reason why the accelerometer receives a different crosstalk in a different direction is found.At last,the measurement results imply that when the resolution is 10-4 rad/(1/2Hz)(100 Hz).The minimum detectable acceleration signal of this accelerometer is 200 ng/(1/2Hz).With this all-metal structure,the fiber optic flexible reed accelerometer can better adapt to the special requirements of weak signal detection.更多还原