How Do Underground Metal Detectors Distinguish Metal Types?

- Jan 01, 2020-

The underground metal detector is made of advanced technology. It has the characteristics of wide detection, accurate positioning, strong resolution and easy operation. Metal detector is mainly used to detect and identify buried metal objects. In addition to its military application, it is also widely used in: safety inspection, archaeology, prospecting, looking for scrap metal. Also known as "iron detector" is a good helper for scrap recycling.


Many treasure hunters like to use the underground metal detector for treasure exploration, but the traditional underground metal detector can't distinguish gold, silver, copper, iron, gemstone and so on. This kind of detection result will cause some troubles. In order to meet the needs of customers, the detection result can give more references to the treasure seekers. With the continuous development of metal detector technology, there are many metals now The detector can distinguish metal types, such as epx10000 large-scale gold scanner, epx9900 underground metal detector.


In order to quickly understand the performance of the instrument and get started quickly, this paper introduces the principle of distinguishing metals by underground metal detector. Each element has its unique molecular structure and vibrates at different molecular frequencies. Every natural element produces a phenomenon called resonance. The underground metal detector can adjust the frequency of the detector to cause the "resonance" of the metal, so as to distinguish the metal.


The underground metal detector adopts sound alarm and instrument display, and the detection depth has a great relationship with the area, shape and weight of the detected metal. Generally speaking, the larger the area is, the more the quantity is, the greater the corresponding detection depth is; otherwise, the smaller the area is, the less the quantity is, the smaller the corresponding depth is. The maximum detection depth listed in the table below is the measured result of embedding a 20cm * 20cm * 0.5cm aluminum plate into the dry soil according to the enterprise standard of the product.


Metal buried in the ground, through the thick soil to detect, will inevitably be affected by the geological structure. There are all kinds of minerals in the stratum. They will also make the metal detection generate signals. The signals of these minerals will cover up the metal signals and create a false image. People who have used the old metal detector have this experience. With the probe near the mound, stone and brick, the alarm will sound. This phenomenon is called "mineralization reaction". For this reason, the old metal detector can only detect the metal in the shallow soil, and can't do anything to the metal target buried deep underground. The underground metal detector is equipped with advanced ground balance system, which can eliminate the interference of "mineralization reaction", and greatly improve the detection depth and effect of the instrument.