Sensor and method for measuring gravitational potential three-order differential quotient based on atom interference effect

Abstract

The invention discloses a sensor and method for measuring a gravitational potential three-order differential quotient based on an atom interference effect, and relates to the technical field of cold atoms in atomic and molecular physical subjects. The sensor is composed of two cold atom interference devices, the central axes of two interference regions are overlapped, two vacuum containers are communicated into a whole in the direction of the central axes, and meanwhile a two-dimensional magneto-optical trap region is arranged. The measuring method is characterized in that the collecting process of a single set of original data points comprises the following steps that the two devices are used for emitting four synchronous faller cold atom groups, an initial state is prepared, synchronous correlation operations based on common Raman laser beams are carried out, and a final state is detected; the data processing process comprises the steps of converting n sets of original data points into n two-order phase difference data points and carrying out fitting processing. According to the system and the method, the influence of external interference and internal noise on measurement can be greatly restrained, and important significance is achieved for resource exploration, geologic structure analysis, physical geography study and other fields.

Description

technical field [0001] The invention relates to the technical field of cold atoms in the subject of atomic and molecular physics, in particular to a gravitational potential third-order differential quotient measurement sensor based on atomic interference effects and a method thereof, which are applied in the field of gravity survey. Background technique [0002] The distribution of mass and density inside the earth directly determines the gravitational field on the surface. At the same time, the differential quotient of each order of the gravitational potential can also be inverted through a series of algorithms to obtain the distribution characteristics of the mass and density inside the earth; therefore, gravity measurement plays an important role in resource exploration, A series of important fields related to the development of the national economy, such as geological structure analysis and underground target search, have always played a very important role. However, the...

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Problems solved by technology

[0009] The present invention first proposes a gravitational potential third-order differential quotient measurement sensor and its method based on the atomic interference effect, aiming to solve the problem of noise common mode suppression and the volume of the measurement device in several possible measurement schemes based on the prior art , weight, power consumption, and complexity issues

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