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1. 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

2. 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.

3. 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

4. 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.

5. 发明专利

GB2255184B Flaw detector for metal material 未知
公开(公告)号：GB2255184B
公开(公告)日：1995-08-16
申请号：GB9116817
申请日：1991-08-05
申请人： TOKYO GAS CO LTD , CHUGOKU X RAY CO LTD
发明人： KAWABE TOSHIHIDE , HOSOHARA YASUHARU , SUZUKI KIWAMU , FUJIWARA SHIGERU
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.

6. 发明专利

FR2675579B1 DETECTEUR DE DEFAUTS POUR UN MATERIAU METALLIQUE, NOTAMMENT UNE CANALISATION, ET CAPTEUR DE COURANTS DE FOUCAULT A CHAMP DISTANT DESTINE A CE DETECTEUR. 未知
公开(公告)号：FR2675579B1
公开(公告)日：1995-02-03
申请号：FR9110181
申请日：1991-08-09
申请人： TOKYO GAS CO LTD , CHUGOKU X RAY CO LTD
发明人： HOSOHARA YASUHARU , YASUHARU HOSOHARA , SUZUKI KIWAMU , KIWAMU SUZUKI , FUJIWARA SHIGERU , SHIGERU FUJIWARA , KAWABE TOSHIHIDE , TOSHIHIDE KAWABE
IPC分类号： G01N27/90 , G01N33/20
摘要： L'invention concerne un détecteur de défauts pour un matériau métallique, notamment une canalisation, comportant un moyen (102) pour générer un signal de référence; une bobine d'excitation (EC) pour recevoir un signal d'excitation de même phase que le signal de référence, afin de générer des courants de Foucault à champ distant dans le matériau à tester; une bobine de réception (RC) espacée d'une distance prédéfinie de la bobine d'excitation pour recevoir lesdits courants, afin de produire un signal de réception; un moyen d'ajustement d'amplitude automatique (110) pour ajuster à un niveau constant le signal de réception; et un moyen générateur de données de défauts (113) pour comparer le signal de réception ajusté avec le signal de référence, afin de générer des données de défauts. L'invention concerne également un capteur de courants de Foucault à champ distant destiné à ce détecteur.

7. 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.

8. 发明专利

GB2255184A EDDY CURRENT FLAW DETECTOR 未知
公开(公告)号：GB2255184A
公开(公告)日：1992-10-28
申请号：GB9116817
申请日：1991-08-05
申请人： TOKYO GAS CO LTD , CHUGOKU X RAY CO LTD
发明人： KAWABE TOSHIHIDE , HOSOHARA YASUHARU , SUZUKI KIWAMU , FUJIWARA SHIGERU
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 fed with a.c. from a reference source 102, and a set of receiving coils RC1 -RC9. The signal picked up in each receiving coil is filtered and passed via an a.g.c. circuit 110 to a phase comparator 112 which also receives a reference signal from the source 102. The comparator output is passed to a flaw detection signal generator 113. In an alternative embodiment (Fig. 2 not shown), the receiving coil signals are processed in pairs, with phase adjustment of one signal of each pair. Thus stable phase detection can be obtained and precise diagnosis of the pipeline to be tested can be performed, without generation of spurious flaw indications. Further, by using an a.g.c. circuit to maintain the signal level provided by the receiving coils, S/N ratio of the flaw data can be improved. Two spaced sets of receiving coils may be provided. If each coil of the second set has fewer turns and is spaced further from the exciting coil than the corresponding coil of the first set, stable detection of both a gradually progressing flaw and a local flaw can be obtained.

9. 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

10. 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.

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