A device for detecting metal foreign bodies in feet

By using a magnetoresistive sensitivity detection device, which utilizes symmetrical rectangular coils and magnetic induction unit arrays, the problem of requiring shoe removal for detection in existing technologies has been solved. This enables rapid and accurate identification and positioning of metal foreign objects on the feet, making it suitable for high-volume security checks.

CN122239162APending Publication Date: 2026-06-19MULTIDIMENSION TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MULTIDIMENSION TECH CO LTD
Filing Date
2026-04-24
Publication Date
2026-06-19

AI Technical Summary

⚠Technical Problem

Existing metal foreign object detection devices require shoes to be removed when detecting small metal objects on the feet, which affects efficiency and may infringe on privacy, making them unsuitable for high-volume security check scenarios.

⚗Method used

A detection device based on magnetoresistive sensitivity is used, which utilizes a symmetrically arranged rectangular coil and magnetic induction unit array. Through a signal processing module, it can quickly and accurately identify and locate metal foreign objects on the foot, avoiding detection by removing shoes.

🎯Benefits of technology

It enables rapid and accurate identification and location of metal foreign objects on the feet without removing shoes, making it suitable for high-volume security inspection scenarios and improving detection sensitivity and environmental robustness.

✦ Generated by Eureka AI based on patent content.

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Abstract

This application provides a device for detecting metallic foreign objects on the foot, comprising: two rectangular coils symmetrically arranged about the YZ plane, an excitation current generating module, several magnetic induction units, and a signal processing module. The rectangular planes formed by the two rectangular coils are parallel to the YZ plane, and the space between them forms a security inspection channel along the Y direction. A background magnetic field is generated by the excitation current flowing in opposite directions from the first and second rectangular coils. The several magnetic induction units are disposed on or below the security inspection channel and arranged in a magnetic induction array, with the sensing direction of each magnetic induction unit perpendicular to the Y-axis. The signal processing module detects or locates metallic foreign objects on the foot of the object being inspected in the security inspection channel based on the sensing signals of the corresponding magnetic induction units in the magnetic induction array. The detection device provided by this application can quickly and accurately identify and locate metallic foreign objects hidden on the sole / foot of the object being inspected in the security inspection channel.
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