High Precision Vertical Pendulum Tiltmeter And Its Application

The measurement of earth tilt is an important method of studying earth crust deformation and its earth tide, which means much to Geodynamics and the observation of earthquake prognostic. Vertical pendulum tiltmeter , which is the third generation continuous observation instrument of earth crust deformation, processes digital function. Its features are small size high precision fine stability and digitize. It can replace traditional horizontal pendulum tiltmeter completely.This paper focuses on the subject of high precision vertical pendulum tiltmeter, and studies deeply a series of problems that involve in high precision capacity micrometry sensor, the mechanical structure of the tiltmeter and its parts, adjusting pendulum and calibration of tiltmeter, and practical application of the vertical pendulum tiltmeter. The main studying results are as follows:(1) The high precision capacity micrometry device is described all-sided and systematically. The solving scheme of data acquisition system and data processing are put forth.(2) The key mechanical parts and the pendulum series structure are deeply studied, and some mathematical models of the pendulum series motion are founded.(3) A design method, which applies spatial many-body center configuration concept to the mechanical structure of the tiltmeter, is first presented and realized.(4) The nonlinear error feature of unidirectional pendulum and two-way columnar single pendulum in vertical pendulum tiltmeter swinging has been analyzed and derived.(5) The direct calibration method of heavy block calibration is first presented and realized. The structures and controlling circuits of automatic adjusting pendulum and automatic calibration are designed.(6) The mathematical models, which are automatic program identification of the calibration results of data acquisition and lattice value calculation, are put forth.(7) The operating environment and stabilizing process of the high precision vertical pendulum tiltmeter are studied, corresponding technique demands are brought, and a lot of valuable first-hand record is gained.China Seismology Bureau "ninth-five" duration emphasis research item(95-04) has endowed the studying works in this paper...