地震检波器特性参数识别的一种新的正弦扫频恒流激励方法

提出一种新的正弦扫频恒流激励法,依此建立了适合不同动圈式地震检波器参数测量的8参数与9参数模型,并给出了检波器固有频率、灵敏度、阻尼比和线圈电感量的测量与识别方法。理论分析、参数识别和与振动台激励法测试的比较结果均显示,此方法测量的频响函数信噪比高,在较宽频率范围内曲线拟合精度较高,测试速度快,操作性好,现已应用于便携式检波器特性参数测试仪的研制与生产,此仪器适用于各种动圈式检波器在生产、维修和施工现场的特性参数测量。

Sine Sweeping Constant Current Exciting for Geophone Characteristic Parameter Measurement and Identification

A new method of sine sweeping constant current exciting is proposed,where 8/ 9 parameter models for different moving-coil geophones are established. The corresponding measuring and identifying of geophone parameters,such as natural frequency,sensitivity,damping ratio and coil inductance,are carried out. A comparison between the experimental results due to vibration exciting and curve fitting analysis indicates the higher signal-to-noise ratio of measuring frequency response function,measurement rate,feasibility and fitting accuracy within a wider frequency range of the presented method,which has been applied to portable geophone parameter tester to calibrate characteristic parameters of geophone in production and maintenance,especially in situ .