This is the heart of the system. It contains wire windings that create an electromagnetic field (transmitter) and coils that pick up changes in that field (receiver).
When the transmitter's magnetic field hits a metal object, the object's resistance and inductance cause a time delay in the returned secondary field. This time delay is called a phase shift. inside the metal detector pdf
The "balanced coil" system used in security gates is the same principle applied to industrial food safety systems, which must detect tiny fragments of ferrous and non-ferrous metals in a production line. The difference lies in the shielding and the speed of the signal processor. This is the heart of the system
+-------------+ | Control Box | <--- Microprocessor, Filters, Audio +------+------+ | | Shaft | +------+------+ | Search Coil | <--- Tx (Transmit) & Rx (Receive) Coils +-------------+ The Search Coil (Loop) This time delay is called a phase shift
The primary coil generates an alternating magnetic field around the search head.
If you're looking for a specific technical guide or a diagram detailing the circuitry, or suggest technical articles about ground balancing techniques . Let me know what you'd like to dive deeper into! Share public link
Disclaimer: Ensure you are using legitimate, authorized sources for technical manuals and guides to guarantee accuracy. If you want to know more, I can help you: