An Atomic Interference Gravity Measurement Device Based on Dual Matter Wave Source

Abstract

The invention discloses an atomic interference gravity measuring device based on a double-matter wave source, and belongs to the technical field of atomic interference and gravity exploration. The device comprises a vacuum chamber which is used for providing a sealed container for atomic steam and providing a vacuum environment with the vacuum degree being 10<-8>-10<-7>Pa for the preparation and manipulation of cold atoms. There are two cold atomic cloud preparation structures which are at the same end of an interference area. The device has a simple structure. The center of gravity of the device is low when the device is in a surface working environment. The device is simply supported, and is of high stability. The two cold atomic clouds share a detection laser and a photoelectric detector in the vacuum chamber of a detection area, so that the system complexity is reduced, and common-mode detection error is restrained. Interference is completed in the same slender vacuum chamber, and a magnetic field shielding material can be wrapped easily. There is no cold atom preparation structure between the two atomic clouds. The device has a small self-gravitation effect. Space is reserved for an additional gravity source to calibrate the measurement result. The device needs only one set of detection system, and has good magnetic field effect restraining performance and low quantum projection noise.

Description

Technical field [0001] The invention belongs to the technical field of atomic interferometer and gravity survey, and more specifically relates to an atomic interference gravity measurement device based on dual matter wave sources. Background technique [0002] Precision gravity measurement is widely used in geophysical applications. In resource exploration, gravitational acceleration and gravity gradient data can be used in the inversion of the gravity field to obtain the mass distribution of the underground, thereby providing important clues for resource exploration. [0003] Gravitational acceleration is the first-order derivative of gravitational potential energy to space position; and gravity gradient is the second-order derivative of gravitational potential energy to space position. It is a second-order tensor with 9 components (of which there are only 5 independent components). Gravity gradient measurement needs to measure the difference in gravitational acceleration between...

AI Technical Summary

Problems solved by technology

This scheme leads to a high center of gravity of the device and poor stability of the device; there is a three-dimensional magneto-optical trap structure between the two interferometers, which leads to a significant self-attraction effect of the instrument; the three-dimensional magneto-optical trap structure between the two interferometers occupies a large area. Space, not conducive to calibration of gradient measurements using additional gravitational mass; requires two sets of detection devices and requires separate magnetic field shielding

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