Metal detector principle and classification function
The principle of metal detectors:
Metal detectors use the principle of electromagnetic induction to generate rapidly changing magnetic fields using coils that have alternating current. This magnetic field can induce eddy currents inside metal objects. The eddy current will generate a magnetic field, which in turn affects the original magnetic field, causing the detector to beep.
Application in archaeology:
For many years, metal detectors have been used by robbers because of its powerful features. Metal detectors not only detect munitions, but also detect coins, keys and other metal objects. Metal detectors are increasingly being used to assist in Surface Penetrating Radar (SPR) and other ground penetrating radar systems. First zui developed by the British (Britain) out of plastic mines for detecting SPR system can be located 30 meters below the surface of abnormal objects. The system also provides a series of clues to help users identify exhibits that have not yet been dug up.
Handheld metal detector :
Handheld metal detectors are designed to detect metal objects carried by people or objects. It can detect weapons, explosives or small metal objects carried inside or wrapped in bags, luggage, letters, fabrics, etc. The special appearance of its sensitive surface makes operation easy. Better than ring sensor type. Ultra high sensitivity, special application. Its weight is only about 0.365kg ( including battery ) .
Underground metal detector:
Underground metal detectors are mainly used to detect and identify buried metal objects. In general, the larger the area, the greater the number, and the greater the depth of detection. Conversely, the smaller the area, the smaller the number, and the smaller the corresponding depth. Normally underground metal detector having a function of the difference between ferrous and nonferrous metals; smart operating system; ABC high strength packaging material, light weight, long life; sound through headphones or the like identifying a metal function.
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