The metal detector is an instrument used to detect metals and is widely used in industrial production, food detection, safety inspection, and archaeological research. A metal detector is based on the principle that when a changing current is passed through a coil, a changing magnetic field is generated in the space around the coil, which in turn affects the original magnetic field. This in turn affects the original magnetic field. Based on this principle, the Food metal detector consists of a probe and a control unit. The detector consists of a transmitter coil and a receiver coil. The control unit contains the circuitry that supports the operation of the transmitter coil, the signal conversion circuitry that is connected to the receiver coil, and the signal processing and displays unit. Let's take a look at the metal detector.