Accelerometer relative gravity meter

Abstract

An accelerometer relative gravity meter comprises a box body and a controller, wherein, the box body is internally provided with a power conversion circuit, a biaxial level gauge, a two-position rotation mechanism, a metal flexible pendulum accelerometer, a temperature control circuit, a measurement and control circuit and an A / D conversion circuit; the rotation mechanism is horizontally arrangedin the middle of the box body; the two-position rotation mechanism is internally provided with the accelerometer; the biaxial level gauge is fixedly arranged on the two-position rotation mechanism; the temperature control circuit is used for controlling the metal flexible pendulum accelerometer and the A / D conversion circuit at a constant temperature; and the measurement and control circuit is used for controlling the two-position rotation mechanism to drive the two positions of the metal flexible pendulum accelerometer to rotate. When the two-position rotation mechanism rotates in place, themeasurement and control circuit controls the A / D conversion circuit to measure output of the accelerometer and carry out signal conversion, and the output signal of the A / D conversion circuit is computationally processed by the controller to obtain the measurement result of relative gravity. The meter has high precision and convenient use, and can randomly measure the gravity acceleration.

Description

technical field [0001] The invention relates to an accelerometer-type relative gravity measuring instrument, in particular to a convenient, fast and maneuverable high-precision accelerometer-type relative gravity measuring system. Background technique [0002] A gravimeter is an instrument used to measure gravity. There are many types of gravimeters, including land gravimeters, marine gravimeters, submarine gravimeters, aerospace gravimeters, well gravimeters, etc. from the scope of application. The determination of the gravity value of the earth can use the physical phenomena related to gravity, such as the free fall motion under the action of gravity, the swing of the pendulum, the expansion and contraction of the spring, and the vibration of the string. Gravity measurement plays a very important role in the application of inertial instruments, mainly referring to the determination of the acceleration of gravity and encrypted gravity measurement at the debugging position ...

AI Technical Summary

Problems solved by technology

At present, the common absolute gravimeters commonly used in the market have low precision, and the products with high precision take a long time to test and are more expensive; while the relative gravimeters commonly used in the market, such as G400, need to return to the reference point for calibration, and cannot To meet the requirements of random measurement, the gravity grid method needs to measure many grid points in advance. For a 20′×20′ grid, the error can reach more than 50 mgal, and the accuracy is relatively low

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