Multi-component cold atom gravity gradient measurement system and method

Abstract

The invention discloses a multi-component cold atom gravity gradient measurement system. The system comprises a plurality of atom interference units. Each atom interference unit comprises a vacuum cavity, an alkali metal sample source, a cooling laser emitter, an inverse Helmholtz magnetic field coil pair and a photoelectric detector. Each vacuum cavity comprises a cold atom preparation cavity anda vertically arranged projectile vacuum tube communicated with the cold atom preparation cavity. The projectile vacuum tube is divided into an atom detection area and an atom interference area, a photoelectric detector is arranged at the side part of the atom detection area, and the centers of the atom interference areas of every two vacuum cavities are connected through a vacuum tube. Accordingto the invention, measurement of all gravity gradient components can be realized in a collinear manner, so that a higher noise common-mode suppression effect is obtained.

Description

technical field [0001] The invention relates to the field of quantum sensing based on atomic interferometer technology, more specifically to a multi-component cold atom gravity gradient measurement system, and also relates to a multi-component cold atom gravity gradient measurement method. Suitable for precision survey of gravity field. [0002] technical background [0003] The gravity field is an inherent property of the earth, which can reflect the distribution of mass on the surface and underground, and has distinct local characteristics. Gravity high-precision measurement technology can be used in resource exploration, environmental monitoring, and geophysical research in the civilian field. In the national defense field, it can be used for autonomous navigation of submarines, search and monitoring of underground and underwater military targets. It is important for national economic development and national security. is of great significance. The gravity gradient field...

AI Technical Summary

Problems solved by technology

[0012] Aiming at the problem in the prior art that it is difficult to directly measure the off-diagonal components of the gravity gradient matrix with high noise common-mode suppression effect, the present invention provides a multi-component cold atom gravity gradient measurement system, and also provides a multi-component cold The atomic gravity gradient measurement method, the present invention can measure the composite value of each component of the gradient matrix along multiple non-orthogonal measurement directions by means of Raman laser straight line penetration, and then solve the original value of each component in the gradient matrix through mathematical equations , so as to achieve high-precision measurement of each off-diagonal component with the same noise common-mode rejection level as the traditional main-diagonal component measurement method

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