Working Point Migration Method Counting Superconducting Magnetometer and Method for Determining the Changing Direction of Magnetic Field

Abstract

The invention relates to a working point migrated counter-type superconducting magnetometer, a method for determining a magnetic field change direction and a retrieval method for acquiring signals. According to the method, one part, exceeding a certain fixed flux value, in flux variation passing a superconducting ring is counted, the other part less than the flux value is measured, and the dynamic range is widened on the premise of not reducing the sampling accuracy of the superconducting magnetometer. The invention provides solutions to several key problems of superconducting quantum counting, the sensitivity and the accuracy of a system are improved and the dynamic range of the superconducting magnetometer is greatly widened; in addition, the problem that a lock type superconducting magnetometer is easily unlocked is solved, and the working stability of the magnetometer is improved. Compared with the existing lock type superconducting magnetometer, the working point migrated counter-type superconducting magnetometer is more suitable for working in field for a long time, and can carry out measurement work in the environment of higher noise in field.

Description

Technical field: [0001] The invention relates to a superconducting magnetometer for geophysical magnetic exploration, in particular to a counting type superconducting magnetometer, especially a counting type superconducting magnetometer based on the working point migration method. Background technique: [0002] Superconducting quantum interference device (SQUID) is the most sensitive weak magnetic measurement sensor known at present. The superconducting magnetometer made by SQUID can be applied in the fields of biomagnetism (heart magnetism, brain magnetism) measurement, non-destructive flaw detection and magnetic prospecting. [0003] Existing superconducting magnetometers are generally designed based on the method of zero-flux locking. However, due to the mutual restriction of dynamic range, precision and sensitivity, this type of superconducting magnetometer can achieve high sensitivity and precision at the same time. Also encountered the embarrassment of a small dynamic...

AI Technical Summary

Problems solved by technology

This magnetometer uses the standard magnetic field generated by the Helmholtz coil to offset part of the external magnetic field to be measured on the basis of zero flux locking, and relatively improves the dynamic range of the SQUID. However, due to the complex structure and large size of the Helmholtz coil , and the absolute coaxiality between the Helmholtz coil and the SQUID cannot be guaranteed during the movement. This magnetometer is not suitable for working in the field and in a sports environment.

[0006] In addition, when a zero-flux-locked superconducting magnetometer is used for long-term measurement, environmental noise, circuit noise and circuit zero drift can easily cause the locked superconducting magnetometer to lose lock. Therefore, based on the zero-flux lock theory Superconducting magnetometers are only suitable for short-term or intermittent measurements

[0007] To sum up, the existing lock-in superconducting magnetometers have problems of practicality and reliability in field work, as well as problems of small dynamic range or low sensitivity and precision, which greatly affect the superconducting magnetometer. Application and Promotion of Magnetometer

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