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A device for improving the sensitivity and anti-interference ability of electromagnetic detection security doors

An electromagnetic detection and security gate technology, which is applied in measurement devices, electric/magnetic exploration, radio wave measurement systems, etc., can solve the problems of difficulty in meeting the scene, high false alarm/missing alarm rate, and improve sensitivity and anti-interference. effect of ability

Active Publication Date: 2020-11-03
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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  • A device for improving the sensitivity and anti-interference ability of electromagnetic detection security doors
  • A device for improving the sensitivity and anti-interference ability of electromagnetic detection security doors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example one, such as figure 1 As shown, a device for improving the sensitivity and anti-interference ability of an electromagnetic detection security gate 5 includes a magnetic conductive arm 1, an electromagnetic excitation coil 2, a plurality of electromagnetic receiving sensors 3, and an electromagnetic detector 4, characterized in that: the magnetic conductive arm The end faces of the two arms of 1 are opposed to each other, and between the end faces of the two arms is the detection channel 50 of the security gate 5. The magnetic arm 1 is used to confine the magnetic field to prevent it from spreading out and improve the anti-interference ability; the electromagnetic excitation coil 2 Wound and fixed on the middle pole of the magnetic conductive arm 1; the multiple electromagnetic receiving sensors 3 are distributed and fixed on the end faces of the two arms of the magnetic conductive arm 1; the electromagnetic excitation coil 2 and multiple electromagnetic receiving s...

Embodiment 2

[0021] Example two, such as figure 2 As shown, a device for improving the sensitivity and anti-interference ability of the electromagnetic detection security gate 5 is characterized in that: further, in the plurality of electromagnetic receiving sensors 3, every two electromagnetic receivers along the detection channel 50 of the security gate 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 subjected to differential comparison processing in the electromagnetic detector 4. This differential comparison processing method is similar to the eddy current differential detection, which can obtain the 8-shaped upper and lower symmetrical detection waveforms. As a criterion, generally speaking, external electromagnetic interference can only obtain unilateral or asymmetrical waveforms, and because the security gate 5 is For dynamic detection of the hum...

Embodiment 3

[0022] The third embodiment is a device for improving the sensitivity and anti-interference ability of the electromagnetic detection security gate 5, which is characterized in that: further, the electromagnetic detector 4 uses alternating excitation current and direct current excitation current to excite the electromagnetic excitation coil 2. In this way, AC and DC magnetic fields are formed in the detection channel 50 area of ​​the security gate 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 nondestructive detection device, in particular to a device for improving the sensitivity and anti-interference ability of an electromagnetic detection security gate. Background technique [0002] At present, most of the electromagnetic detection security gates on the market use simple emission / reception reflections. Due to the lack of external shielding measures (considering cost and ease of use), the false alarm / missing alarm rate is high, and it is difficult to meet the real needs of the scene. Summary of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a device for improving the sensitivity and anti-interference ability of the electromagnetic detection security gate. The magnetic material is used to constrain the electromagnetic excitation magnetic field so that it does not diffuse outward, and at the same time greatly improves the anti-interference ability. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/10
CPCG01V3/10
Inventor 林俊明
Owner EDDYSUN (XIAMEN) ELECTRONICS CO LTD