Patent Number: 048896799
Section: claims

1. An eddy current probe apparatus capable of being disposed in a tubular member adjacent to a structure, comprising: (a) a support body disposed in the tubular member;  (b) expansion means sealingly attached to and surrounding said support body for diametrically expanding the tubular member into engagement with the structure; and  (c) electromagnetic means connected to said support body and interposed between said support body and said expansion means for detecting the variations in the electromagnetic characteristics of the tubular member and of the structure, whereby the location of the structure relative to said expansion means is electromagnetically detected thereby and whereby the extent of diametrical expansion of the tubular member is continuously electromagnetically detected by said electromagnetic means.  (a) a generally cylindrical support body capable of being disposed in the tube;  (b) a generally cylindrical expansible sleeve surrounding said support body for diametrically expanding the tube into engagement with the structure, said sleeve having a first sleeve end and a second sleeve end capable of being sealingly compressed against said support body;  (c) fluid feed means in fluid communication with said sleeve for pressurizing and depressurizing said sleeve;  (d) an eddy current coil connected to said support body and interposed between said support body and said sleeve and having a plurality of electricity conducting wires therein surrounding said support body on the in-board side of said sleeve for detecting the variations in the electromagnetic characteristics of the tube and of the structure, whereby the location of the structure relative to said sleeve is electromagnetically detected thereby and whereby the extent of diametrical expansion of the tube is continuously electromagnetically detected by said eddy current coil.  (a) a generally cylindrical stud having an externally threaded first stud end and an externally threaded second stud end and having an external surface thereon;  (b) a generally cylindrical first end cap coaxially threadably attached to the first stud end, said first end cap having a first step bore therein having internal threads in the smaller portion thereof for threadably engaging the external threads of the first stud end and having a smoother surface in the larger portion thereof for sealingly compressing the first sleeve end of said sleeve against said stud;  (c) a generally cylindrical second end cap coaxially threadably attached to the second stud end, said second end cap having a second step bore therethrough having internal threads in the smaller portion thereof for threadably engaging the external threads of the second stud end and having a smoother surface in the larger portion thereof for sealingly compressing the second sleeve end of said sleeve against said stud, said second end cap having a cavity therein in fluid communication with the second stud end at one end of the cavity and with said fluid feed means at the other end of the cavity for delivering fluid from said fluid feed means to the second stud end; and  (d) a channel formed through said stud and extending from the second stud end to the external surface of said stud opposite said sleeve for channeling fluid to and withdrawing fluid from said sleeve, whereby said sleeve is pressurized and depressurized thereby. 2. The apparatus according to claim 1, further comprising fluid feed means in fluid communication with said expansion means for pressurizing and depressurizing said expansion means. 3. The apparatus according to claim 2, wherein said electromagnetic means further comprises an eddy current coil connected to and surrounding said support body. 4. The apparatus according to claim 3, wherein said electromagnetic means further comprises a plurality of thin electricity-conducting wires each having a round cross-sectional configuration. 5. The apparatus according to claim 4, wherein said wires are arranged in an annular configuration surrounding said support body for continuously electromagnetically detecting the extent of diametrical expansion of the tubular member. 6. The apparatus according to claim 3, wherein said eddy current coil further comprises a plurality of electricity-conducting wires each having a square cross sectional configuration for resisting the pressurization of said eddy current coil. 7. The apparatus according to claim 6, wherein said wires are arranged in an annular configuration surrounding said support body for continuously electromagnetically detecting the extent of diametrical expansion of the tubular member. 8. In a nuclear reactor power plant, an eddy current probe apparatus capable of being disposed in a steam generator tube adjacent to a structure, comprising: 9. The apparatus according to claim 8, wherein said wires have a square cross-sectional configuration for resisting the pressurization of said eddy current coil. 10. The apparatus according to claim 9, wherein said wires are arranged in an annular configuration around said support body for continuously electromagnetically detecting the extent of diametrical expansion of the tube. 11. The apparatus according to claim 10, wherein said support body further comprises: 12. The apparatus according to claim 11, wherein said fluid feed means further comprises a fluid feed conduit extending from a fluid supply reservoir to the second step bore for supplying fluid to the channel, whereby said sleeve surrounding said stud is expansibly pressurized when fluid flows from the fluid supply reservoir, through said fluid feed conduit, through the cavity, to the second stud end, through the channel and to the sleeve for pressurizing said sleeve. 13. The apparatus according to claim 12, wherein said stud has a circumferentially bulged portion near the middle portion thereof for decreasing the radial diametrical distance of expansion of said sleeve when said sleeve expands into engagement with the tube. 14. The apparatus according to claim 13, wherein said bulged portion has a circumferential groove therein having a square cross-sectional configuration for receiving said eddy current coil flush within the groove.