Weak magnetic detection method

Abstract

The invention belongs to the technical field of article detection and specifically relates to a weak magnetic detection method which carries out detection by taking a weak magnetic field feature of a detected object as a basis. According to the technical scheme provided by the invention, the detected object can be distinguished according to concrete types comprising a human type, an eyeglass ornament type, a communication recording equipment type such as mobile phone earphones and the like, a key watch type, a controlled knife type and other types. Products further developed based on a basic principle of the method include yet are not confined to mobile phone detection doors, radiation-free metal safety check doors, package detectors, metal lossless flow detection devices and the like. On the basis that the type of the detected object is distinguished by use of the magnetic field feature of the detected object, the purpose of relevant detection is realized, and the rate of false alarm is substantially reduced.

Description

technical field [0001] The invention belongs to the technical field of object detection, and in particular relates to a weak magnetic detection method, which detects based on the weak magnetic field characteristics of the measured object. Background technique [0002] Ferromagnetic objects will be magnetized in the earth's magnetic field, and the magnetized objects will disturb the surrounding magnetic field. Smaller permanent magnets or electronic products with weak currents can also generate magnetic fields within a certain space. Under the condition that the size, shape and position of the measured object are unknown, the properties of the measured object cannot be simply judged only by the magnetic field strength at a certain point in space. When the measured object and the magnetic sensor move relative to each other, the magnetic field distribution of the measured object in space is detected and recorded, and the magnetic strength, size, shape and position information ...

AI Technical Summary

Problems solved by technology

The security gate can detect ferromagnetic objects, permanent magnetic objects and current-passing equipment, but according to the technical principle and method of the patent, it can only trigger an alarm based on the maximum magnetic field strength, but cannot further analyze the size and shape of the measured object , position and magnetic field characteristics, etc. Therefore, it is impossible to distinguish various objects with weak magnetic fields according to actual detection requirements

That is, according to the technical principle, there are problems such as an unavoidable high false alarm rate

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