A metal object detection system and method based on an array coil

Abstract

The present disclosure provides a metal object detection system based on an arrayed coil, in the technical field of data metal object detection, including at least two opposite detection panels, each detection panel is covered with an array of balanced coils; Under the action, according to the magnitude of the change in the induced voltage of each balance coil on the detection panel, it is judged whether there is a metal object and the shape and position of the metal object; It is a separate coil. Under the action of the exciting magnetic field, when there is no metal object in the detection area, the properties of each coil output are specific values. When the metal object enters the detection area, the property of the balance coil changes, and the property change is realized. Precise identification of the shape, contour, location and type of metallic objects.

Description

technical field [0001] The present disclosure relates to the technical field of metal object detection, and in particular to a metal object detection system and method based on an array coil. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] The application of metal object detection technology in security inspection and other fields has attracted extensive attention. At present, the metal object detection method used in security inspection is mainly the multi-position coil detection method based on electromagnetic induction. [0004] The inventors of the present disclosure have found that the traditional multi-position balance coil needs to be specially set up with a zero adjustment coil to correct the working state, such as figure 1 As shown, it can only give an alarm within a certain range during detection, and cannot locate and identif...

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Problems solved by technology

[0004] The inventors of the present disclosure have found that the traditional multi-position balance coil needs to be specially set up with a zero adjustment coil to correct the working state, such as figure 1 As shown, it can only give an alarm within a certain range during detection, and it is impossible to locate and identify metal objects, which may easily cause false alarms and missed alarms; in the signal processing part, traditional security doors use peak detection and ADC analog-to-digital conversion circuits. The ADC analog-to-digital conversion chip has high requirements for power supply and interference removal of the entire chip, and the circuit implementation is more complicated.

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