发明名称 |
High temperature electromagnetic acoustic transducer (EMAT) probe and coil assemblies |
摘要 |
An enhanced EMAT probe and coil construction takes advantage of heat transfer and magnetic flux principles to permit inspection of workpieces at elevated temperatures of 1200 DEG F. and higher. A ferromagnetic, cup-shaped probe assembly having an end cap and a barrel is provided for carrying a coil assembly, preferably one or more permanent magnets, and a frustoconical focus core. The magnets are located within the barrel and connected to the end cap, and the cup-shaped probe assembly positions the coil assembly proximate the surface of the workpiece. A plurality of passageways may be provided in the end cap and barrel for admitting cooling air to an interior portion of the cup-shaped probe assembly. The cup-shaped probe assembly serves to provide a return path for magnetic flux of the magnetic field back to the permanent magnet means. The coil assembly has a coil disk having a matrix of holes and grooves which allow at least one eddy current coil wire to be threaded and interwoven into the coil disk without shorting against itself. A layer of fiberglass cloth covers the coil assembly to thermally and electronically insulate it from the workpiece, providing a durable, rugged and economical construction.
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申请公布号 |
US5689070(A) |
申请公布日期 |
1997.11.18 |
申请号 |
US19950506413 |
申请日期 |
1995.07.24 |
申请人 |
THE BABCOCK & WILCOX COMPANY |
发明人 |
CLARK, STEVEN P.;FLORA, JOHN H.;MACLAUCHLAN, DANIEL T |
分类号 |
B06B1/04;G01N29/22;G01N29/24;(IPC1-7):G01N29/22;G01N29/04 |
主分类号 |
B06B1/04 |
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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