A metal detector is a device that detects the presence of metallic material. Metal detectors can use radio waves, magnetic fields, or 300 kHz electric currents to detect the metal. In order to separate metals from plastic, the circuitry will analyze the kind of electrical conductivity or another characteristic of each material.
Walk Through Metal Detector With Temperature Sensor
A walk-through metal detector with a temperature sensor detects metallic objects by making an electronic field that couples to conductive metals like steel by inducing an AC current wave in them with a frequency depending on their lowest natural frequency (resonance). The resonant objects respond with strong AC voltage signals that are used by circuitry to detect and identify them. The magnetron transmits microwaves: then electrons oscillate around the waves and emit lower frequency radiation as they accelerate towards and strike grids adjacent to an open emitter terminal,