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Device and method for improving sensitivity as well as anti-interference capability of electromagnetic walk through metal detector

An electromagnetic detection and security door technology, applied in the direction of measuring devices, electric/magnetic exploration, radio wave measurement systems, etc., can solve the problems of difficult to meet the scene, high false alarm/missing rate, etc., to improve sensitivity and anti-interference effect of ability

Active Publication Date: 2018-08-24
EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most of the electromagnetic detection security doors on the market use simple transmission / reception reflection. Due to the lack of external shielding measures (in view of cost and convenience of use), the false alarm / missing rate is high, and it is difficult to meet the real needs of the site.

Method used

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  • Device and method for improving sensitivity as well as anti-interference capability of electromagnetic walk through metal detector
  • Device and method for improving sensitivity as well as anti-interference capability of electromagnetic walk through metal detector

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Embodiment one, such as figure 1 As shown, a device for improving the sensitivity and anti-interference ability of the electromagnetic detection security door 5, including a magnetic conducting arm 1, an electromagnetic excitation coil 2, a plurality of electromagnetic receiving sensors 3, and an electromagnetic detector 4, is characterized in that: the magnetic conducting arm The end faces of the two arms of 1 are opposite, and the detection channel 50 of the security door 5 is between the end faces of the two arms. The magnetic conducting arm 1 is used to restrain the magnetic field so that it does not spread outwards and improves the anti-interference ability; the electromagnetic excitation coil 2 Wrapped and fixed on the middle rod part of the magnetic conducting arm 1; the plurality of electromagnetic receiving sensors 3 are distributed and fixed on the end faces of the two arms of the magnetic conducting arm 1; the electromagnetic excitation coil 2 and the pluralit...

Embodiment 2

[0021] Embodiment two, such as figure 2 As shown, a device for improving the sensitivity and anti-interference ability of the electromagnetic detection security door 5 is characterized in that: further, among the plurality of electromagnetic receiving sensors 3, every two electromagnetic receiving sensors along the direction of the detection channel 50 of the security door 5 The sensors 3 are fixed side by side to form a differential receiving group, that is, the magnetic field disturbance signals received by the two electromagnetic receiving sensors 3 are differentially compared in the electromagnetic detector 4 . This differential comparison processing method is similar to eddy current differential detection, which can obtain a figure-eight symmetrical detection waveform as a criterion. Generally speaking, external electromagnetic interference can only obtain unilateral or asymmetric waveforms, and because the security door 5 is For dynamic detection when the human body is ...

Embodiment 3

[0022] Embodiment 3, a device for improving the sensitivity and anti-interference ability of the electromagnetic detection security door 5, characterized in that: further, the electromagnetic detector 4 excites the electromagnetic excitation coil 2 by means of alternating excitation current and DC excitation current, In this way, AC and DC magnetic fields are formed in the area of ​​the detection channel 50 of the security inspection door 5 to further improve the detection sensitivity.

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Abstract

The invention discloses a device and method for improving the sensitivity as well as an anti-interference capability of an electromagnetic walk through metal detector. A magnetic conductive material is used, an electromagnetic excitation magnetic field is limited and prevented from spreading outwardly, the anti-interference capability is improved greatly, and different parts, as the head, waist, buttocks and legs, of the human body can be detected separately according to requirements.

Description

technical field [0001] The invention relates to a non-destructive testing device and method, in particular to a device and method for improving the sensitivity and anti-interference ability of an electromagnetic detection security door. Background technique [0002] At present, most of the electromagnetic detection security doors on the market use simple transmission / reception reflection. Due to the lack of external shielding measures (in view of cost and convenience of use), the false alarm / missing rate is high, and it is difficult to meet the real needs of the scene. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a device and method for improving the sensitivity and anti-interference ability of electromagnetic detection security doors, using magnetically permeable materials, constraining the electromagnetic excitation magnetic field so that it does not diffuse outwards, and greatly impr...

Claims

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Application Information

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IPC IPC(8): G01V3/10
CPCG01V3/10
Inventor 林俊明
Owner EDDYSUN (XIAMEN) ELECTRONICS CO LTD