Eddy current nondestructive evaluation device with rotating permanent magnets and pickup coils

An eddy current nondestructive evaluation device comprising:

• a translating body;
• a permanent magnet coupled with the translating body;
• a pickup coil coupled with the translating body;
• a rotational sensor coupled with the translating body, the rotational sensor measures angular rotation of the rotating body, wherein the rotational sensor comprises an accelerometer;
• a position tracking system that provides a spatial position of the eddy current nondestructive evaluation device, wherein the position tracking system comprises one or more of a laser, optics or an encoder wheel;
• and
• an integrator circuit disposed within the translating body, the integrator circuit electrically coupled with the pickup coil that integrates a voltage from the pickup coil to produce integrated voltage data to provide spatial data of a defect in a sample.

A method comprising:

• moving a rotating body having one or more permanent magnets and one or more pickup coils at a rate of movement near a surface of a sample;
• measuring an angular rotation of the rotating body with an accelerometer;
• measuring a spatial position of the rotating body with a position tracking system that comprises one or more of a laser, optics or an encoder wheel;
• integrating one or more voltage signals from the one or more pickup coils to produce integrated voltage data;
• and
• determining spatial data of a defect in the sample based at least on the integrated voltage data and the rate of movement, wherein the spatial data includes at least one of a depth, a size, and a shape of the defect.