Dictionary / Coil & Geometry

Loop Coil

Coil & Geometry

An open electromagnetic coil designed to be placed around a limb or curved around a body part. The magnetic field passes through from all sides simultaneously. Unlike the enclosed donut coil, a loop is open. Limbs can be passed through it for surrounding coverage of arms, legs, or joints. The field profile is similar to a donut coil with peak strength in the ring zone. The open geometry allows flexible placement. Measurements are taken at 50% of the tubing thickness from the surface.

Loop Coil example: A cut through the measured field of a Loop Coil example, showing where the coil concentrates its field. Measured by Gauss Labs from a real accessory and presented as an illustrative example. — A cut through the measured field of a Loop Coil example, showing where the coil concentrates its field. Measured by Gauss Labs from a real accessory and presented as an illustrative example.

How the wire is wound sets where the field is strongest. Each profile is a real measured cross-section. A pancake coil is a tight flat spiral, so its field stays strong across a broad center. A donut coil leaves a hole in the middle, so its field peaks in a ring and dips at the center. A loop coil is one large turn, so its field peaks over the wire ring and eases off toward the middle and the rim. Copper dots are the wire seen end-on.

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Loop Coil

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