Abstract
The existing eddy current measurement thickness technology is mainly for one or more layers of metal plate. However, in real life, the radius of spherical metal is also a critical parameter, so using an eddy current sensor to measure it is also an important research topic. In this paper, real part slope of inductance is used as the characteristic value to characterize the radius of the non-magnetic metal sphere. Compared with the traditional real part of inductance, the addition of slope improves the accuracy and stability of detection data. The experimental results show that the maximum error rate of radius measurement is less than 2%, and the overall data stability is good, which can meet the measurement requirements.
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