发明名称 |
METHOD FOR DETERMINING AVERAGE WALL THICKNESS FOR PIPES AND TUBES USING GUIDED WAVES |
摘要 |
A method for determining changes in the average wall thickness of the mean radius of a pipe or tube (10) using ultrasonic and/or magnetostrictive wave probes (12) by analyzing the dispersive behavior of waves (14) traveling in the tube wall volume. The method examines certain wave propagation modes and identifies a cut-off frequency that is characteristic for a particular wall thickness or tube diameter. This method permits the rapid and accurate inspection of a length of pipe or tube from a single location on the inside diameter of the pipe and permits a comparison of data gathered with similar data for the structure in its original condition. Changes in the cut-off frequency, indirectly determined by the method of the present invention are inversely related to changes in the wall thickness and/or the mean radius for the cylindrical structure. In this manner the method of the present invention provides a mechanism for determining the remaining service life for such pipes and tubes.
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申请公布号 |
WO9939355(A9) |
申请公布日期 |
1999.10.21 |
申请号 |
WO1999US02072 |
申请日期 |
1999.01.29 |
申请人 |
SOUTHWEST RESEARCH INSTITUTE |
发明人 |
BROPHY, JOSEPH, W.;KWUN, HEGEON |
分类号 |
G01B17/02;G01N29/24;G01N29/34;G01N29/46;G01N29/50;G21C17/00;(IPC1-7):G21C17/00;G01N9/24 |
主分类号 |
G01B17/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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