Movable cold atom absolute gravitational acceleration sensor

Abstract

The invention discloses a movable cold atom absolute gravitational acceleration sensor, which belongs to the field of precise measurement of absolute gravitational acceleration. The sensor is composed of a vacuum unit, an optical path unit, a magnetic shielding unit, a passive vibration isolation platform, an accelerometer, an inclinometer and the like. Among them, the vacuum unit is mainly made of glass materials, and it is directly connected with the optical path unit in free space; the magnetic shielding unit is used to reduce the influence of the external magnetic field on the absolute gravity measurement; the passive vibration isolation platform is used to suppress Interference from ground vibration and noise; in addition, the accelerometer and inclinometer are mainly used for active compensation of random vibration and acquisition of vertical lines, and are assisted in absolute gravity measurement. The present invention is characterized in that the vacuum unit has a high degree of freedom for light transmission, is small in size and light in weight, and is directly connected with the optical path unit so that the measurement system is compact, stable and highly adaptable to the environment. The invention mainly solves key technical problems such as miniaturization, light weight and mobility of the cold atom absolute gravimeter.

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. [0002] technical background [0003] 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. [0004] 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 i...

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Problems solved by technology

[0009] 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

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