发明名称 |
Method for measuring the wall thickness of an electrically conductive object |
摘要 |
Measuring the wall thickness of an electrically conductive object using a probe comprising a transmitter coil, a first receiver and a second receiver, which method comprises arranging the probe near the object; inducing transient eddy currents in the object and recording the signals of the receivers with time; measuring the wall thickness from a characteristic of one of the signals; calculating a characteristic value from a combination of the signals; and correcting the measured wall thickness for the distance between the probe and the object using a pre-determined relationship between the wall thickness and the characteristic value for different values of the distance between the probe and the object.
|
申请公布号 |
US6593737(B2) |
申请公布日期 |
2003.07.15 |
申请号 |
US20010931993 |
申请日期 |
2001.08.18 |
申请人 |
SHELL OIL COMPANY |
发明人 |
CROUZEN PAULUS CAROLUS NICOLAAS;LOOLJER MARK THEODOOR;VAN DER STEEN JOHAN |
分类号 |
G01B7/00;G01B;G01B7/02;G01B7/06;G01R35/00;(IPC1-7):G01B7/06 |
主分类号 |
G01B7/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|