| 摘要 |
PURPOSE: A method of measuring crud thickness on nuclear fuel rods is provided to accurately measure the thickness of a crud layer containing ferromagnetic material formed on a nuclear fuel rod cladding. CONSTITUTION: A method for determining the thickness of a layer of crud containing ferromagnetic material formed on the surface of a nuclear fuel rod comprises the steps of placing a probe of an eddy current sensor on the surface of the layer of crud containing ferromagnetic material, the probe having a coil excited with an alternating current having a frequency selected for penetrating only into the layer of crud containing ferromagnetic material and producing a complex impedance of the probe representative of the permeability change and thickness change and conductivity change of the layer of crud containing ferromagnetic material, exciting the probe with an alternating current having the frequency, and measuring the complex impedance representative of the thickness of the layer of crud containing ferromagnetic material.
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