Holographic sizing of contaminants in HV XLPE cable

A method is developed to size the particles of contaminants in insulation of HV crosslinked polyethylene cable by using a Fraunhofer far-field in-line holographic technique with no need to cut the insulation into thin slices. The maximum thickness of the sample is 4.0 cm, when a resolution of 50 mu m is obtained. The accuracy of measurement is approximately 10% for particles >20 mu m diameter.<
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