Metal object detection system and method based on array coils

Abstract

The invention provides a metal object detection system based on array type coils, and relates to the technical field of data metal object detection. The metal object detection system comprises at least two oppositely arranged detection panels, and each detection panel is distributed with balance coils in an array manner. Under the action of the excitation magnetic field, whether a metal object exists or not is judged and the shape and the position of the metal object are judged according to the variation of the induced voltage of each balance coil on the detection panel. According to the invention, the array type coils are fully distributed on the whole detection panel. Each grid is an independent coil. Under the action of an excitation magnetic field, when no metal object exists in a detection area, the attribute output by each coil is a specific value, when the metal object enters the detection area, the attribute of the balance coil changes, and accurate identification of the shape,the contour, the position and the type of the metal object is achieved through attribute changes.

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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