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Dictionary / Field Strength

Center Field Strength

Field Strength
The magnetic field strength measured at the exact center point of the accessory (0mm from center). For pancake coils, this is typically the strongest point. For donut coils, center field is weaker than the ring zone. Comparing center field to peak field gives the Ring/Center Ratio used to identify coil type.
Field strength peaks at the coil center and falls off with distanceA symmetric bell-shaped curve with its peak in the middle: the magnetic field is strongest at the coil center and weakens with distance in either direction. Using the on-axis dipole model, the field drops to 50 percent of its peak at about 0.77 coil radii from center and to 10 percent at about 1.93 coil radii.100%50%10%Peak50% at 0.77 R10% at 1.93 R3 R2 R1 Rcenter1 R2 R3 RDistance from center (multiples of coil radius R)Field strength (% of peak)© 2026 Gauss Labs
The field is strongest right at the coil and weakens with distance in every direction. On the on-axis dipole model the report uses, it reaches half its peak strength at about three quarters of a coil radius from center and one tenth at about two radii. A larger coil holds the field up farther out.
universal

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