专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

DE4126162C2 未知
公开(公告)号：DE4126162C2
公开(公告)日：1996-08-14
申请号：DE4126162
申请日：1991-08-07
申请人： TOKYO GAS CO LTD , CXR CO
发明人： HOSOHARA YASUHARU , SUZUKI KIWAMU , FUJIWARA SHIGERU , KAWABE TOSHIHIDE
IPC分类号： G01N27/90
摘要： The present invention relates to a flaw detector for metal material for maintaining and managing pipelines using a remote field eddy current sensor. An AC signal having a constant level and shifted by predetermined phase angle is added to signals received in receiving coils of the remote field eddy current sensor to obtain accurate phase detection in a normal, nonflawed portion of the pipeline to be tested (e.g. uniform thickness, no holes, etc.). By preventing generation of abnormal flaw data, precise diagnosis of the pipeline can be performed. An AGC circuit may be used to maintain at a constant level of received signal. Two sets of spaced apart receiving coils are spaced from an exciting coil a distance greater than a predetermined distance (about two time the pipeline diameter). The set of receiving coils closest to the exciting coil has a greater number of coil turns than the other set. This coil configuration generates sensed coil differential signals having sufficient signal amplitude to permit stabilized and accurate phase detection and comparison for nonflawed and gradually flawed regions in the pipe.

2. 发明专利

DE4126162A1 未知
公开(公告)号：DE4126162A1
公开(公告)日：1992-10-29
申请号：DE4126162
申请日：1991-08-07
申请人： TOKYO GAS CO LTD , CXR CO
发明人： HOSOHARA YASUHARU , SUZUKI KIWAMU , FUJIWARA SHIGERU , KAWABE TOSHIHIDE
IPC分类号： G01N27/90
摘要： The present invention relates to a flaw detector for metal material for maintaining and managing pipelines using a remote field eddy current sensor. An AC signal having a constant level and shifted by predetermined phase angle is added to signals received in receiving coils of the remote field eddy current sensor to obtain accurate phase detection in a normal, nonflawed portion of the pipeline to be tested (e.g. uniform thickness, no holes, etc.). By preventing generation of abnormal flaw data, precise diagnosis of the pipeline can be performed. An AGC circuit may be used to maintain at a constant level of received signal. Two sets of spaced apart receiving coils are spaced from an exciting coil a distance greater than a predetermined distance (about two time the pipeline diameter). The set of receiving coils closest to the exciting coil has a greater number of coil turns than the other set. This coil configuration generates sensed coil differential signals having sufficient signal amplitude to permit stabilized and accurate phase detection and comparison for nonflawed and gradually flawed regions in the pipe.

3. 发明专利

GB2291975B Flaw detector and flaw detection method for metal pipes 未知
公开(公告)号：GB2291975B
公开(公告)日：1998-07-15
申请号：GB9515678
申请日：1995-07-31
申请人： TOKYO GAS CO LTD , OSAKA GAS CO LTD , TOHO GAS KK , CXR CORP
发明人： HOSOHARA YASUHARU , CHIBA YOSHIKAZU , KINOSHITA AKIRA , AKITA MASANORI , SUMI TAKASHI , KAWABE TOSHIHIDE
IPC分类号： G01N27/90
摘要： A flaw sensor for a metal pipe has an exciting coil for generating remote field eddy currents in the pipe. First and second groups of receiving coils are spaced from the exciting coil by respective distances along the axis of the pipe in a region of the generated remote field eddy currents. The first and second groups have respective pluralities of receiving coils with axes perpendicular to the pipe axis and disposed circumferentially about the pipe axis at predetermined angular increments wherein the receiving coils of the second group are staggered relative to the receiving coils of the first group. A third receiving coil is disposed coaxially with the pipe at still another distance from the exciting coil along the pipe axis but also in the region of the generated remote field eddy currents. When a defect in the thickness of the metal pipe is encountered, a magnetic field caused by the defect to be perpendicular to the axis of the pipe is detected by one or more of the receiving coils of the first and/or second group. The third receiving coil detects phase changes to the magnetic field generated parallel to the pipe by the eddy currents. A ratio of phase changes produced by a standard thickness of a reference pipe and a sample subject pipe is used as a correction factor for detected phase changes in a defective pipe to accurately calculate the defective wall thickness.

4. 发明专利

GB2281398B Flaw detector for metal material 未知
公开(公告)号：GB2281398B
公开(公告)日：1995-08-16
申请号：GB9421617
申请日：1991-08-05
申请人： TOKYO GAS CO LTD , CHUGOKU X RAY CO LTD
发明人： HOSOHARA YASUHARU , SUZUKI KIWAMU , FUJIWARA SHIGERU , KAWABE TOSHIHIDE
IPC分类号： G01N27/90

5. 发明专利

GB2281399B Flaw detector for metal material 未知
公开(公告)号：GB2281399B
公开(公告)日：1995-08-16
申请号：GB9421618
申请日：1991-08-05
申请人： TOKYO GAS CO LTD , CHUGOKU X RAY CO LTD
发明人： HOSOHARA YASUHARU , SUZUKI KIWAMU , FUJIWARA SHIGERU , KAWABE TOSHIHIDE
IPC分类号： G01N27/90

6. 发明专利

GB2281398A Eddy current flaw detector 未知
公开(公告)号：GB2281398A
公开(公告)日：1995-03-01
申请号：GB9421617
申请日：1991-08-05
申请人： TOKYO GAS CO LTD , CHUGOKU X RAY CO LTD
发明人： HOSOHARA YASUHARU , SUZUKI KIWAMU , FUJIWARA SHIGERU , KAWABE TOSHIHIDE
IPC分类号： G01N27/90
摘要： A flaw detector for metal material which can check pipelines by means of the remote field eddy current method comprises an exciting coil EC and one or more receiving coils RC1 - RC9. The exciting coil is fed with a.c. from a reference source 202, the same signal being fed to an attenuator 205 and phase shifter 206. The signal picked up in each receiving coil is filtered (208, 210) and added to the phase shifted reference signal by adder 211. The output from the adder is passed via a waveform shaping circuit 212 to a phase comparator 213 which also receives a reference signal from the source 202. The comparator output is passed to a flaw detection signal generator 214.

7. 发明专利

DE19528003A1 未知
公开(公告)号：DE19528003A1
公开(公告)日：1996-02-08
申请号：DE19528003
申请日：1995-07-31
申请人： TOKYO GAS CO LTD , OSAKA GAS CO LTD , TOHO GAS KK , CXR CORP
发明人： HOSOHARA YASUHARU , CHIBA YOSHIKAZU , KINOSHITA AKIRA , AKITA MASANORI , SUMI TAKASHI , KAWABE TOSHIHIDE
IPC分类号： G01N27/90 , G01N17/02 , G01M3/00 , F17D5/06
摘要： A flaw sensor for a metal pipe has an exciting coil for generating remote field eddy currents in the pipe. First and second groups of receiving coils are spaced from the exciting coil by respective distances along the axis of the pipe in a region of the generated remote field eddy currents. The first and second groups have respective pluralities of receiving coils with axes perpendicular to the pipe axis and disposed circumferentially about the pipe axis at predetermined angular increments wherein the receiving coils of the second group are staggered relative to the receiving coils of the first group. A third receiving coil is disposed coaxially with the pipe at still another distance from the exciting coil along the pipe axis but also in the region of the generated remote field eddy currents. When a defect in the thickness of the metal pipe is encountered, a magnetic field caused by the defect to be perpendicular to the axis of the pipe is detected by one or more of the receiving coils of the first and/or second group. The third receiving coil detects phase changes to the magnetic field generated parallel to the pipe by the eddy currents. A ratio of phase changes produced by a standard thickness of a reference pipe and a sample subject pipe is used as a correction factor for detected phase changes in a defective pipe to accurately calculate the defective wall thickness.

8. 发明专利

GB2281399A Eddy current flaw detector 未知
公开(公告)号：GB2281399A
公开(公告)日：1995-03-01
申请号：GB9421618
申请日：1991-08-05
申请人： TOKYO GAS CO LTD , CHUGOKU X RAY CO LTD
发明人： HOSOHARA YASUHARU , SUZUKI KIWAMU , FUJIWARA SHIGERU , KAWABE TOSHIHIDE
IPC分类号： G01N27/90

9. 发明专利

FR2723170B1 未知
公开(公告)号：FR2723170B1
公开(公告)日：1996-12-27
申请号：FR9509294
申请日：1995-07-31
申请人： TOKYO GAS CO LTD , OSAKA GAS CO LTD , TOHO GAS KK , CXR CORP
发明人： HOSOHARA YASUHARU , CHIBA YOSHIKAZU , KINOSHITA AKIRA , AKITA MASANORI , SUMI TAKASHI , KAWABE TOSHIHIDE
IPC分类号： G01N27/90 , F16L55/18
摘要： A flaw sensor for a metal pipe has an exciting coil for generating remote field eddy currents in the pipe. First and second groups of receiving coils are spaced from the exciting coil by respective distances along the axis of the pipe in a region of the generated remote field eddy currents. The first and second groups have respective pluralities of receiving coils with axes perpendicular to the pipe axis and disposed circumferentially about the pipe axis at predetermined angular increments wherein the receiving coils of the second group are staggered relative to the receiving coils of the first group. A third receiving coil is disposed coaxially with the pipe at still another distance from the exciting coil along the pipe axis but also in the region of the generated remote field eddy currents. When a defect in the thickness of the metal pipe is encountered, a magnetic field caused by the defect to be perpendicular to the axis of the pipe is detected by one or more of the receiving coils of the first and/or second group. The third receiving coil detects phase changes to the magnetic field generated parallel to the pipe by the eddy currents. A ratio of phase changes produced by a standard thickness of a reference pipe and a sample subject pipe is used as a correction factor for detected phase changes in a defective pipe to accurately calculate the defective wall thickness.

10. 发明专利

CA2048496C FLAW DETECTOR FOR METAL MATERIAL 未知
公开(公告)号：CA2048496C
公开(公告)日：1996-07-30
申请号：CA2048496
申请日：1991-08-06
申请人： TOKYO GAS CO LTD , CHUGOKU X RAY CO LTD
发明人： HOSOHARA YASUHARU , SUZUKI KIWAMU , FUJIWARA SHIGERU , KAWABE TOSHIHIDE
IPC分类号： G01N27/90 , G01N27/82
摘要： The present invention relates to a flaw detector for metal material which can maintain and manage pipelines by means of the remote field eddy current method and a remote field eddy current sensor apt for the above detector. In the flaw detector for metal material, AC signal having a constant level and shifted in a predetermined phase angle are added with received signal received in receiving coils of the remote field eddy current sensor. Thus stable phase detection in a normal part of the pipeline to be tested can be obtained and precise diagnosis to the pipeline to be tested can be performed by preventing generation of abnormal flaw data. Further, when using an AGC circuit in order to maintain the received signal level provided by the received coils, S/N ratio of the flaw data can be improved by stabilization of the received signal level. Further, is providing a receiving coils which receive the remote field eddy current and another receiving coil which have fewer number of turns than that of said received coils and are spaced further from the exciting coil than the predetermined distance, a stable data as to both of the gradually flaw progressing part and the local flaw progressing part can be obtained by the remote field eddy current sensor.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式