$$ f = \frac12\pi\sqrtLC $$
In Concentric and DD configurations, the TX and RX coils must be physically arranged so that they perfectly cancel each other out when no metal is present. This state is called "zero balance." The interior of the coil housing is coated with a conductive carbon or silver spray (Faraday shield) to eliminate static interference from wet grass and soil.
Metal detectors are fascinating devices that bridge the gap between physics, electronic engineering, and practical exploration. Whether used for treasure hunting, industrial quality control, or security screening, the core principles remain rooted in electromagnetism. inside the metal detector pdf
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The processed signal triggers an audio oscillator to produce a tone. In digital detectors, an Analog-to-Digital Converter (ADC) routes the data to a microprocessor, which displays a target ID number or graphic on an LCD screen. 4. Search Coil Engineering and Geometry
The specific circuits inside a detector define its capabilities. There are three primary technologies in use today.