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Dictionary / Measurement Geometry

Axial Measurement

Measurement Geometry
Field strength measured along the central axis of the applicator coil, perpendicular to its face. Axial readings represent the maximum field value at a given distance and are used as the reference standard for PEMF device characterization. Field strength falls off rapidly with distance. Values in the report are at 0mm (contact surface) unless otherwise noted.
Field falling off with depth, fit to the dipole-loop modelA curve of field strength versus depth straight out from the coil. It starts at the surface peak and falls with depth along the on-axis dipole-loop model. A measured point is fit to the model to find the coil effective radius.100%50%10%Measured point, fit to the modelsurface1 R2 R3 RDepth into the body (multiples of coil radius R)Field strength (% of surface peak)© 2026 Gauss Labs
Straight out from the coil, the field falls off with depth along a known curve, the on-axis dipole-loop model. The report fits a single measured point to that curve to recover the coil effective radius, then uses the fitted curve to estimate how the field carries into the body. Real coils fall off faster than a single ideal loop, which the fit accounts for.
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