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These are used in food, pharmaceutical, and packaging industries. They often operate at high frequencies, using a balanced coil system designed to detect tiny fragments of ferrous, non-ferrous, and stainless-steel contaminants in a production line. inside the metal detector pdf

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The simplest and oldest form. BFO detectors use two oscillators: one with a fixed frequency and one with a frequency that varies based on the inductance of the search coil. When metal enters the coil's field, it changes the inductance, altering the second oscillator's frequency. The two signals are "mixed," and the difference (or "beat") frequency is converted into an audible tone. As frequencies shift, the tone changes, alerting the user. The simplest and oldest form