A new measuring system using an optical fiber and a position sensing photodetector was developed to measure a three‐dimensional distribution of a magnetic force. A steel ball attached to a cantilever made of an optical fiber generated force in a magnetic field. The displacement of the ball due to the force was detected by a position‐sensing photodetector with the capability of detecting two‐directional coordinates of the position. By scanning the sensing system in a magnetic field, we obtained distributions of two‐directional component of the magnetic force vector. The component represents the gradient of a squared magnetic field. The usefulness of the system for measuring the magnetic field distribution in a narrow clearance and for evaluating superconducting machine components such as magnetic bearings was verified experimentally.
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