a coiled conductor, usually of known area and number of turns, that is used with a flux meter to measure the change of flux linkage with the coil

A mechanical and electrical component, consisting of wire coils and tuned circuits that transmit and receive the R.F.electro-magnetic signal from the metal detector, to the target and then back again for the purpose of sensing buried metallic objects.

The commonest way of measuring magnetic fields at power frequencies. A coil of wire has a voltage induced in it by an alternating magnetic field.

Part of metal detector responsible for sensing targets. Coils create an electromagnetic field and sense the field created by the targets. Coils contain transmitting and receiving windings in various configurations

A search coil is a device for measuring eye movements. It uses coils that are embedded into a tightly-fitting contact lens or a rubber ring that adheres to the eye. An alternating magnetic field with horizontal and vertical components is used to induce electric currents in these coils.