A Movable Cold Atom Absolute Gravity Acceleration Sensor

Abstract

The invention discloses a movable cold atom absolute gravitational acceleration sensor, and belongs to the absolute gravitational acceleration precision measuring field; the sensor comprises a vacuum unit, an optical path unit, a magnetic shielding unit, a passive vibration isolation platform, an accelerometer, and an inclinometer; the vacuum unit is formed by mainly bonding glass materials, and directly joints with the optical path unit in a free space; the magnetic shielding unit is used for reducing extraneous magnetic field influences on the absolute gravity measurement; the passive vibration isolation platform is used for suppressing ground vibration noise interferences; in addition, the accelerometer and the inclinometer are mainly used for actively compensating random vibrations and obtaining the vertical line, and assist the absolute gravity measurements. The features are that the vacuum unit is high in light through degree of freedom, small in size, light in weight, can be directly jointed with the optical path unit, so the measuring system is compact, stable, and strong in environment adaptability; the invention mainly solves the key technical problems that the cold atom absolute gravimeter is miniaturized, lightweighting and movable.

Description

technical field [0001] The invention belongs to the field of precise measurement of absolute acceleration of gravity, in particular to a small movable cold atom absolute acceleration of gravity sensor. technical background [0002] High-precision absolute gravity acceleration measurement has a very broad application prospect in the fields of geographic surveying and mapping, resource exploration, geological research, environmental monitoring, and homeland security. [0003] The earliest devices for measuring absolute gravitational acceleration were based on the principle of a simple pendulum, which had poor measurement repeatability and accuracy. The absolute gravimeter with the best performance is based on the laser interferometry method, which extracts the absolute gravitational acceleration by accurately measuring the position of the free-falling mirror as a function of time in a vacuum. The highest measurement accuracy of the absolute gravimeter based on laser interfero...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the above-mentioned shortcomings and deficiencies of the existing cold atom absolute gravimeter, especially to solve the problems of miniaturization, integration and light weight of the cold atom absolute gravimeter, and to provide a compact structure, small volume and light weight , low power consumption and reliable absolute gravity sensor

Images