Influence of Coupling Interference on Arrayed Eddy Current Displacement Measurement
Publication: Publication Date: 30 November 2016Testing Method:
For arrayed eddy current displacement measurement,
the measuring error is caused by the
coupling interference between coils. In order to
analyze the influence, simulation and experiments
were carried out. It was found that both liftoff and
sensor spacing have an impact on the coupling
interference. Also, the sensor’s measuring range is
reduced when the spacing is less than the coil
outer diameter. In addition, the percentage of
reduction of the measuring range will vary with
sensor spacing according to the exponential rule.
Additionally, a piecewise effect caused by liftoff on
the coupling was discovered, which is significant
for arrayed eddy current applications. Finally, with
the help of the sensor’s inverse transfer function
established by the sixth order polynomial fitting,
compensation was accomplished. As a result, the
compensation has a good effect: the average error
was 0.009 mm, while the maximum error was
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