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一种电磁式地震计简单而又精确的标定方法得到论证,即从信号线圈释放一阶跃电流信号,同时把信号线圈切换到记录器,以记录其响应。本文研究一种理论,即分析响应的系统识别输出,求得地震计有阻尼的发电机常数、谐振频率及阻尼系数。整个标定只需知道地震计的质量(厂家提供)和所施加的电流(可测量)。无需线圈电阻和阻尼电阻。这种标定方法通过与重锤标定方法和标定线圈的标定方法比较而得到证实。对GS-13V地震计,各种标定方法结果互相都在1.3％以内。用信号线圈标定方法得到的有阻尼的发电机常数计算的无阻尼发电机常数,比厂家提供的发电机常数优1％。对9个新的L-4C地震仪标定,无阻尼发电机常数标定结果均在厂家提供数值的3％以内。本文给出了信号线圈标定方法所用的电路并作了解释。
A simple and accurate calibration of an electromagnetic seismometer was demonstrated by releasing a one-step current signal from the signal coil and simultaneously switching the signal coil to a recorder to record its response. In this paper, we study a theory that analyzes the system identification output of the response, obtains the damping generator constant, resonant frequency and damping coefficient of the seismometer. The entire calibration only needs to know the quality of the seismometer (supplied by the manufacturer) and the applied current (measurable). No coil resistance and damping resistance required. This method of calibration is verified by comparison with the method of weight calibration and calibration coil calibration. For GS-13V seismometers, the results of various calibration methods are within 1.3% of each other. Undisturbed generator constants calculated from the damping generator constants obtained using the signal coil calibration method are 1% better than the generator constants provided by the manufacturer. For 9 new L-4C seismometers calibrated, the un-damped generator constant calibration results are within 3% of the value provided by the manufacturer. This article gives the circuit for signal coil calibration and explains it.