Introduce the working principle of metal detector in detail
The working principle of metal detectors is introduced in detail. Metal detectors are also known as metal detectors, metal detectors, metal detectors and other metal detectors. Usually metal detectors are composed of two parts, namely the detection coil and the automatic rejection device, of which the detection coil is the core. part. After the coil is energized, a magnetic field will be generated, and if metal enters the magnetic field, it will cause the magnetic field to change, thus judging that there are metal impurities. Some products themselves contain water, salt and other ingredients, which will also interfere with the magnetic field similar to metals. This phenomenon is called the product effect. Such problems can be solved by the product effect compensation function. After the metal is detected, the sensor activates the signal to drive the automatic rejection device, such as flaps, push rods, etc., to remove impurities. First of all, we need to understand several concepts, that is, what is eddy current? How is the magnetic field created? When a metal object is in a changing magnetic field, or when a metal object moves in the magnetic field, an induced current will be generated in the metal, and this current will form a loop inside the metal in a vortex shape, which is called eddy current; according to the principle of electromagnetic field, The generation of the magnetic field is relatively simple. The time-varying electric field can generate the magnetic field, and the time-varying magnetic field can generate the electric field. The two are related to each other and are indispensable. Now that we know the principle of eddy current and magnetic field generation, let's talk about the coil of the metal detector. The probe contains three coils, which are in a symmetrical relationship. The middle (transmitting coil) is used to transmit high-frequency electromagnetic fields through a high-frequency oscillator, and the two sides (receiving coils) are used to receive electromagnetic wave signals. When no metal objects are close to the outside world In this electromagnetic field, the coils on both sides are connected by opposite polarities, and no induced voltage is output. At this time, if metal impurities enter the area of u200bu200binfluence of the magnetic field, the signals of the two receiving coils cannot be cancelled, and the output induction difference is not zero. The induced voltage flows through the filtering and demodulation circuit, and the system collects the value in real time and exchanges Calculated and analyzed by high-speed DSP, it is concluded that the presence of metal is detected, and the controller realizes alarm control and automatic removal of metal substances. Our company is a professional manufacturer of metal detectors. All products can be customized according to your actual requirements. Welcome friends who are interested click here to contact us at any time.
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