Method for measuring the thickness of oxide layer underlying crud layer containing ferromagnetic material on nuclear fuel rods,申请号US19990398536-传众专利搜索

Method for measuring the thickness of oxide layer underlying crud layer containing ferromagnetic material on nuclear fuel rods

申请公布号：US6366083(B1)

申请号：US19990398536

申请日期：1999.09.17

申请公布日期：2002.04.02

申请人：

FRAMATOME ANP INC.

发明人：MCCLELLAND RICHARD G.

分类号：G01B7/06;G01B7/00;G01B15/02;G01N27/90;G21C3/06;G21C17/06;(IPC1-7):G01B7/06;G01N22/77;G01R33/12

主分类号：G01B7/06

摘要：A method for measuring the thickness of an oxide layer formed on the cladding surface of nuclear fuel rods and underlying a crud layer containing ferromagnetic material using eddy current lift-off measurements by exciting a probe coil at a first frequency which penetrates only into the crud layer and by exciting a probe coil at a second frequency which penetrates the crud layer, the oxide layer and into the cladding of a nuclear fuel rod. By subtracting vectorally the complex impedance resulting from exciting the probe coil at the first frequency from the complex impedance resulting from exciting the probe coil at the second frequency, the thickness of the oxide layer formed on the cladding is measured.