Full-tensor space gradient compensation method and system used for biomagnetic detection

Abstract

The invention provides a full-tensor space gradient compensation method and system used for biomagnetic detection. The method includes the steps of determining 9 full-tensor first-order gradient components of an environment magnetic field to be the first-order gradient components, in the x direction, the y direction and the z direction respectively, of the x-direction magnetic field, the first-order gradient components, in the x direction, the y direction and the z direction respectively, of the y-direction magnetic field and the first-order gradient components, in the x direction, the y direction and the z direction respectively, of the z-direction magnetic field according to a three-dimensional rectangular coordinate system xyz, determining 5 independent first-order gradient components in the full-tensor first-order gradient components, establishing the 5 independent first-order gradient components through a magnetometer, conducting compensation on a signal channel of the environment magnetic field, obtaining a compensation coefficient through the minimum mean square error, and achieving the compensation for the full-tensor first-order gradient components of the signal channel of the environment magnetic field. By means of the method and the system, the space full-tensor first-order gradient compensation is achieved, the environment noise can be more effectively restrained, and the noise restraining performance of a gradiometer is improved.

Description

technical field [0001] The invention belongs to the technical field of signal detection and relates to a gradient compensation method, in particular to a full tensor space gradient compensation method and system for biomagnetic detection. Background technique [0002] There is a wealth of electromagnetic information behind life activities. Biomagnetism comes from the space magnetic field generated by biological magnetoelectric activities. Its strength is very weak. For example, the typical strength of adult heart magnetism is 100pT, and brain magnetism is even weaker, only on the order of hundreds of fT. . As a highly sensitive magnetic sensor, Superconducting Quantum Interference Device (SQUID) is widely used in the measurement of biological magnetic signals. Compared with the weak biomagnetic signal, the environmental magnetic field is very strong. For example, the typical strength of the earth's magnetic field is 30-50μT, and the variation of urban environmental noise ha...

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Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a full tensor space gradient compensation method and system for biomagnetic detection, which is used to solve the problem of using multiple magnetometers to construct a certain or Problem with limited compensation capability of two first-order gradient references

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