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GS-15型重力仪是利用摆杆位移大小来量度重力相对变化的精密仪器,摆杆位移是通过电容换能进行测量。由于该仪器为开环检测系统,而且系统的末级加接0.01Hz的有源滤波器,这样就失去了大于0.01Hz的高频成分,且使潮波产生相位失真,同时还存在着电路非线性带来的测量误差,因而测量精度难以提高。为此笔者对GS-15型重力仪加装了电磁反馈装置,将开环检测改为闭环检测,利用电磁力使重力仪摆杆始终处于零电平的动态平衡状态,以电磁反馈输出大小来度量重力的变化,这样就将开环检测系统改装为平衡电桥闭环检测系统,其时间常数为2秒。 改装后,消除了电路的非线性影响,增强了系统的稳定性,记录的固体潮含有丰富的谐波,同时系统还增加了一路稳态零位输出,为地壳形变、地震预报和地球物理研究提供了波群丰富的资料。
GS-15 gravimeter is the use of the size of the pendulum displacement to measure the relative changes in gravity precision instruments, pendulum displacement is measured by the capacitance transducer. Because the instrument is an open-loop detection system, and the system’s final stage plus 0.01Hz active filter, thus losing more than 0.01Hz high-frequency components, and the tidal wave phase distortion occurs, as well as circuit non-availability Linear measurement error, so measurement accuracy is difficult to improve. To this end, I added GS-15 gravity meter electromagnetic feedback device, the open-loop detection to closed-loop detection, the use of electromagnetic force so that the gravitational force pendulum is always at zero-level dynamic equilibrium, the size of the electromagnetic feedback output Measure changes in gravity so that the open loop detection system is converted to a balanced bridge closed loop detection system with a time constant of 2 seconds. After the modification, the non-linear influence of the circuit is eliminated and the stability of the system is enhanced. The solid tide recorded is rich in harmonics. At the same time, a steady-state zero-position output is added to the system for crustal deformation, earthquake prediction and geophysical research Provides a wealth of information on the wave group.