Precise simple-pendulum type relative gravity meter

Abstract

The invention discloses a precise simple-pendulum type relative gravity meter. One pendulum rod or two suspension fibers are connected with a cross beam, the lower portion of the pendulum rod or the lower portions of the suspension fibers are connected with a pendulum mass, and then a simple-pendulum system is formed. A support supports the simple-pendulum system through wear-resisting contacts on the cross beam. The stability of the environment where the simple-pendulum system is located is kept through a vacuum cavity, a temperature control system, an electrostatic shielding case and a damping base, equivalent pendulum length fluctuation is reduced, and therefore high-stability low-loss simple pendulum movement is achieved. A pair of capacitor displacement transducer polar plates are arranged over the pendulum mass and a pair of capacitor displacement transducer polar plates are arranged under the pendulum mass. The capacitor displacement transducer polar plates and the pendulum mass form a variable-area capacitor displacement transducer together, wherein the variable-area capacitor displacement transducer is used for measuring real-time displacement of the pendulum mass. A first oscillation starting and pendulum locking displacement executing machine and a second oscillation starting and pendulum locking displacement executing machine are installed on the two sides of the pendulum mass respectively, and therefore an oscillation starting and pendulum locking mechanism for simple-pendulum motion is formed. The precise simple-pendulum type relative gravity meter is simple in structure, convenient to use, beneficial to maneuvering observation and capable of achieving measurement of simple-pendulum type relative gravity on the level of the resolution of 0.1mgal.

Description

technical field [0001] The invention belongs to the field of gravitational acceleration measuring instruments, and more specifically relates to an economical and applicable precision single pendulum relative gravimeter, which is suitable for research fields requiring regional surface gravitational acceleration data such as geological survey, resource exploration, and basic scientific research. Background technique [0002] Acceleration of gravity is a basic geophysical constant, and accurate measurement of acceleration of gravity is of great significance in the fields of earth science and resource exploration. [0003] Gravitational acceleration measurement can be divided into absolute measurement and relative measurement, and the corresponding instruments are called absolute gravimeter and relative gravimeter respectively. Absolute gravimeter refers to the measurement of the absolute magnitude of the acceleration of gravity g. Common methods include the pendulum method (inc...

AI Technical Summary

Problems solved by technology

The traditional variable pitch capacitive sensing method will have electrostatic reaction interference to the inspection quality; and the laser interferometry system is more complicated

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