The principle of metal detector and the influencing factors of detection accuracy
Kenwei Intelligence: The principle of metal detector and the influencing factors of detection accuracy The working principle of metal detector: a central transmitting coil and two equal receiving coils, these three coils are installed in a detection head. 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 area, the signals output by the two output coils cannot be cancelled, and the metal detector can detect the presence of metal. A small piece of metal in candy or other foods can seriously injure a consumer. Therefore, protecting the interests of consumers and establishing a good corporate image are the primary purposes of using metal detectors. In addition, a small piece of metal sheet on the production line will also cause serious wear and tear to the production equipment of the enterprise, and the maintenance cost of the equipment is very expensive, which will greatly increase the production cost of the enterprise. Several factors affecting the metal detector (1) Conversion coil frequency The transmission frequency of the conversion coil and the size of the metal sheet will directly affect the detection results. (2) The phase angle of the conversion coil causes the phase relationship of various metals. Each different metal can generate different detection signals. Therefore, the detection signal can be regarded as a vector, the phase angle represents the metal type, and the vector length represents the size of the metal sheet. (3) Product effect If a product can conduct electricity, the product usually has a certain amount of water, and it can be said that it has a product effect. From the technical point of view of metal detection, this conductive product is no different from metal. The sensitivity of the metal detector varies due to the different distribution of the magnetic field. The closer to the centerline, the lower the sensitivity. The sensitivity is lowest at the centerline, so when testing, the test sample should pass through the centerline. Factors Affecting Detection Sensitivity Metal detection is a relatively complex technology, and its results are affected by many factors. 1. Detection port size 2. Working frequency 3. Metal type 4. Sheet metal shape 5. Influence of external environment 6. Product Effect 7. How: Continuous/intermittent For a period of time, the food, confectionery, tobacco and other industries have taken a series of measures to improve product quality. However, even in food enterprises with highly automated production and strict management, the possibility of product contamination by metals in the production process cannot be completely ruled out. Therefore, if the product is contaminated with metal, the company must use a metal detector to remove the unqualified product from the production line.
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