How to test the function of walk through metal detector?

Many household electrical appliances, such as mobile phones, walkie-talkies, microwave ovens, induction cookers, televisions, etc., will radiate electromagnetic waves to the surrounding space, and a similar situation exists in the airport metal detector. The strength of electromagnetic waves is measured by electromagnetic induction intensity. When the magnetic induction intensity exceeds a certain value, it will cause personal injury. Next, let's take a look at two of the ways to test the functionality of the walk through metal detector.

Here is the content list:

• Verification of the safety of electromagnetic field radiation

• Detection ability test for metal objects

Verification of the safety of electromagnetic field radiation

To ensure the safety of inspected personnel and operators, in the Chinese national standard "GB15210-2003 General Technical Specifications for Walk Through Metal Detector", the magnetic induction intensity of walk through metal detector is strictly limited. For relevant technical parameters, please refer to the description of 4.6.6 "Magnetic induction limit in the detection area" in the national standard, "In the area formed by 150mm inwards from the left and right boundaries of the detection area, the magnetic induction intensity at any point should not exceed 30μT". Only if the value specified in the standard is not exceeded, can human health be protected from harm. Therefore, the security metal detector produced by any enterprise must strictly implement the national standard, pass the inspection by the national "Ministry of Public Security Safety and Police Electronic Product Quality Inspection Center", give instructions on the safety of electromagnetic radiation, and issue a certificate. The local Public Security Bureau will issue a production license accordingly. Therefore, the magnetic induction intensity must be lower than the warning value of the national standard to ensure the personal health and safety of the inspected personnel and operators.

Detection ability test for metal objects

Choose the same metal sample to detect the walk through metal detector, the smaller the false negative, the better. Conventional walk through metal detectors should be able to detect all metals (except specially designed detectors), and can pass the strict inspection of the "sensitivity" standard in the national standard "GB15210-2003". The metal samples we choose to detect are best included in the national standard range.

Metal signal detection ability is a symbol of the technical strength of a metal detector manufacturer. Manufacturers with good technology can detect non-ferrous metals and ferrous metals in the same way, and can detect smaller metals under the condition of good stability. The sensitivity control is very clear. However, if the sensitivity of the poor-quality door frame metal detector is slightly increased, it will alarm randomly if nothing is passed through. If the sensitivity is slightly lowered, a large metal object must pass through to alarm. This kind of walk through metal detector is caused by poor internal circuit design performance and non-linear control, so it cannot be used.

In addition, due to the directionality of electromagnetic waves, there is also directionality in the detection of metal objects. The signal generated by the surface with the most cutting electromagnetic waves is correspondingly strong, and the signal generated by the surface with the least cutting electromagnetic waves is correspondingly weak. Production companies with excellent technology can average the directionality of the magnetic field, so the effect of detecting metal objects in different directions in the same detection area of the walk through metal detector is not much different. If the difference is large, the false negative is greater, so the user should choose a product with good directional detection and averaging effect.

Select the same metal object to be carried by the tester to pass through each area of the walk through metal detector, pass the metal object in different directions in each area, and select the product with fewer false positives. For the removal of small metals, it is enough to adjust the sensitivity to an appropriate position when detecting larger metals, and the test method is the same as above.

If you are interested in our walk through metal detector products or have other needs, you can contact us. Our website is https://www.securityscreeningscan.com/. Welcome and look forward to cooperating with you.