Working Principle Of Gold Detector

Metal detector is the abbreviation of metal detector, which is used to detect foreign metal objects mixed in the production process of food, medicine, cosmetics, textile and so on. At present, 95% of the metal detectors on the market are balanced coil metal detectors. The oscillator emits a high-frequency magnetic field through the transmitting coil in the middle, which is connected to the two receiving coils, but with opposite polarities. When the magnetic field is not disturbed by the outside world, the voltage output signals generated by them cancel each other out. Once metal impurities enter the magnetic field, this balance is disrupted, and the metal detector can detect the presence of metal. The lower the operating frequency of the gold inspection machine (25kHz--800KHz), the lower the sensitivity of the equipment; the higher the frequency, the higher the sensitivity of the equipment, this phenomenon is very obvious for non-ferrous metals. Low frequencies are used for wet products and metal film packaging products, and high frequencies are used for dry products. When the single frequency operation of the metal detector is used for the monitoring of dry or wet products at the same time, the sensitivity is reduced.