Crustal inclination measurement device and method adopting force balance feedback quartz horizontal pendulum

Abstract

The invention discloses a crustal inclination measurement device and method adopting a force balance feedback quartz horizontal pendulum. The crustal inclination measurement device comprises a bottom plate, wherein a tower-shaped quartz rack is fixed on the bottom plate. A quartz pendulum rod is suspended on the rack through two quartz suspension springs, and is at an approximately horizontal state. A pendulum bob is inserted and mounted at one end of the pendulum rod, and first and second parallel metal plates are respectively arranged on the two sides of the vertically arranged pendulum bob. The pendulum bob is parallel with the first and second parallel metal plates, so as to form a differential plate capacitor, wherein the pendulum bob serves as a moving plate, and the first and second parallel metal plates serve as static plates. The first and second parallel metal plates are connected with output terminals of a fixed direct current voltage generation unit and a sine waveform generation unit; the pendulum bob is connected with the input terminal of a crustal inclination measurement circuit; the output terminal of the crustal inclination measurement circuit is connected with the pendulum bob through a feedback unit. The crustal inclination measurement device can realize accurate measurement of crustal inclination angle when small inclination of the ground occurs, and a closed-loop feedback structure is constructed to solves problems in the existing quartz horizontal pendulum clinometers.

Description

technical field [0001] The invention relates to an instrument and method for measuring ground inclination of a quartz horizontal pendulum based on differential capacitive micro-displacement detection and electrostatic force feedback technology, belonging to the field of ground inclination measurement. Background technique [0002] The pendulum inclinometer is the earliest short-baseline inclinometer used to measure ground inclination. It uses two hanging wires to hang a horizontal pendulum bar so that it is in a nearly horizontal state. A pendulum is installed at one end of the pendulum bar. When the ground slightly tilts perpendicular to the pendulum plane, the pendulum will drive the pendulum to deflect at a larger angle, and the deflection angle can be detected by sensors such as optical levers. [0003] Utilizing fused quartz with excellent performance and its drawn filaments, Zhu Hu of the Institute of Geophysics, China Earthquake Administration and other seniors develo...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a force balance feedback quartz horizontal pendulum inclination measuring device and method to solve the existing problems of the existing quartz horizontal pendulum inclinometer such as open loop, unsatisfactory frequency characteristics, linearity and dynamic range indicators. Advanced problems can comprehensively improve the performance of the instrument

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