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Search coils for metal detectors Types of search coils
In modern metal detectors use different types of search coils. Depending on the metal detector to search for a hobby , a circular (concentric ) , elliptical and outline the search coil.
The configuration of search coils for metal detectors depends on the location of the transmitting and receiving coils . In addition, they have a certain size range , universal or a dedicated purpose. Which search coil for metal detector is better?
Concentric (round ) shape search coil arrangement involves transmitting and receiving coils inside one another . This achieves maximum electromagnetic field , the greatest sensitivity to the target and the greatest depth of detection.
Concentric coils generate a symmetrical electromagnetic field , with the more reliable the location of the object and is the most accurate identification . Therefore, these types of search coils are most common and are used in most models of metal detectors .
Search coils for metal detectors- Types of search coils
Mono coil is one of the concentric type of search coils for metal detectors and metal detectors used in pulse . Functions receive and transmit coils performs the same coil . Characteristics of sensitivity and detection depth in Mono coils similar to those of concentric coil .
Elliptical coil has a greater selectivity in comparison with a round the coil . The width of the electromagnetic field it is smaller and the zone of the field gets smaller foreign objects . However, the circular coil has a greater depth of detection and better sensitivity to the target at low-salinity soils.
Coil Double-D is a variation of elliptical coil. The electromagnetic field generated by the coil Double-D, spreads narrow strip in the center of the main search coil and shows better results in highly mineralized ground and the search for high trash areas . On weakly mineralized soils lost a little sensitivity and depth of detection compared with concentric coil.
Framework searchcoils used in deep metal detectors . Transmit and receive coils are oriented orthogonally to and spaced apart by a distance of three or four coil diameters . This arrangement generates a large magnetic field. This type of search coils for metal detectors is beneficial when searching for “deep” large objects and ignores small targets (less than 3 inches) .
