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A Novel Rotational Field Eddy Current Planar Probe with Two-Circular Sector Pickup Coils
Guolong Chen1, Weimin Zhang2, Wuyin Jin3
1School of mechanical and electrical engineering, Lanzhou university of technology, Lanzhou 730050, China. cgl20061273@126.com.
Abstract:
A new rotational field planar eddy current probe is proposed. The probe is combined with two orthogonal driver traces and a pickup coil that includes two-circular sector windings with series connection. Rotational eddy currents are induced by driver traces of the same amplitude and frequency, but fed with 90° phase different alternating exciting currents. An experimental demonstration using prototypes of the probes and artificial defects showed that the probe with a two-circular sector pickup coil is more sensitive for detecting the short defects than the probe with a circular pickup coil.
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