正弦扫频电激励法测量与识别地震检波器特性参数

依据动圈式地震检波器的互易性质,将检波器的电特性与力学特性相结合,提出了用正弦扫频电激励测量动圈式检波器特性参数的新方法,建立了这一方法的数学模型;以此为目标函数,对实测频率响应函数进行了曲线拟合并确定了检波器的特性参数;分析了影响测量精度的各种因素.理论分析、实验结果和与振动台激励方法的比较结果均表明,此方法稳定性好,精度高,测试系统简单,适合于检波器生产、维修和施工检测使用.研究结果为便携式检波器特性参数测试仪的研制提供了新的依据.

Characteristic Parameter Measurement and Identification of Geophone by Electric Sine Sweeping Exciting

A new method for measuring and identifying characteristic parameters of moving-coil geophone was proposed based on geophone's reciprocity, where sine sweeping signal is considered as the exciting. A corresponding mathematical model was constructed and used as the objective function for curve fitting. Geophone characteristic parameters were then obtained by fitting the measured amplitude-frequency curves. Several factors affecting measure accuracy were analyzed. The theoretical and experimental results indicate that the present method is suitable for production and maintenance, especially for in situ calibration of the geophone due to its easy operation, high accuracy, and good stability. This work provides a new way to design and manufacture of the portable geophone parameter tester.