A Compensation Method for Disturbing Magnetic Field

Abstract

The invention provides a disturbance magnetic field compensation method, specifically a disturbance magnetic field compensation method when the tracking compensation sensor is in the non-working area of ​​the magnetic field coil, which can eliminate the difference in the coil constant of the primary compensation winding caused by the increase of the distance. The method is based on the conventional interference magnetic field compensation system, adding a secondary compensation winding at the position of the sensor for tracking compensation, so that the magnetic field coil constant of the primary compensation winding at the position of the sensor for tracking compensation in the interference magnetic field compensation system is the same as that of the sensor under test. The magnetic field coil constants at the positions are equal, and this method can eliminate the difference in the magnetic field coil constants of the primary compensation winding caused by the inconsistency between the compensation sensor and the measured object, so that the interference magnetic field compensation system can achieve the best compensation effect.

Description

technical field [0001] The invention relates to a disturbance magnetic field compensation technology, in particular to a disturbance magnetic field compensation method when a tracking compensation sensor is in a non-working area of ​​a magnetic field coil. Background technique [0002] When performing a weak magnetic field measurement test, a standard magnetic field is generated by a standard magnetic field coil, and then the measured object is placed in the working area of ​​the standard magnetic field coil. However, the standard magnetic field will be affected by the interference magnetic field generated by various random disturbances such as geomagnetic fluctuations. In order to reduce or eliminate the influence of the interference magnetic field on the stability of the standard magnetic field in the working area of ​​the magnetic field coil, it is necessary to use the interference magnetic field compensation technology to compensate the interference magnetic field. The t...

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Problems solved by technology

If the measured object and its related tooling and other auxiliary equipment occupy a large space, the distance between the compensation sensor and the center of the measured object is 1m, and the magnetic field coil constant of the compensation winding at the two positions differs by 17.6%. At this time, the theoretical best compensation effect is only It can reach 82.4% (the corresponding compensation efficiency is about 15dB), which is very different from the actual best compensation effect of more than 60dB, which does not consider the inconsistency between the working area of ​​the standard magnetic field coil and the position of the tracking compensation sensor.

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