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1.发明授权Remote field flaw sensor including an energizing coil, first and second receiving coil groups oriented perpendicular and a third receiving coil oriented parallel to pipe 失效远场缺陷传感器包括激励线圈，垂直定向的第一和第二接收线圈组以及平行于管道定向的第三接收线圈
公开(公告)号：US5623203A
公开(公告)日：1997-04-22
申请号：US506759
申请日：1995-07-26
申请人： Yasuharu Hosohara , Yoshikazu Chiba , Akira Kinoshita , Masanori Akita , Takashi Sumi , Toshihide Kawabe
发明人： Yasuharu Hosohara , Yoshikazu Chiba , Akira Kinoshita , Masanori Akita , Takashi Sumi , Toshihide Kawabe
CPC分类号： G01N27/902
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.
摘要翻译： 用于金属管的缺陷传感器具有用于在管道中产生远场场涡流的励磁线圈。 第一组和第二组接收线圈在所产生的远场涡流的区域中沿着管的轴线与励磁线圈隔开相应的距离。 第一组和第二组具有各自的多个接收线圈，其轴线垂直于管轴线并以预定的角度增量围绕管轴线周向设置，其中第二组的接收线圈相对于第一组的接收线圈交错。 第三接收线圈在与激励线圈沿着管轴线更远的距离处与管道同轴设置，但也在所产生的远场涡流的区域中。 当遇到金属管的厚度缺陷时，由第一和/或第二组的一个或多个接收线圈检测由该缺陷引起的垂直于管轴的磁场。 第三接收线圈通过涡流检测与管道平行产生的磁场的相位变化。 使用由参考管和样本对象管的标准厚度产生的相变的比率作为有缺陷管中检测到的相变的校正因子，以精确地计算缺陷壁厚度。
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2.发明授权Remote field eddy current flaw detector for metal pipes having a pair of receiver coils providing a differential offset amplitude signal 失效具有提供差分偏移信号的接收器线圈的金属管道的远场现场电流检测器
公开(公告)号：US5210492A
公开(公告)日：1993-05-11
申请号：US740388
申请日：1991-08-05
IPC分类号： G01N27/90
CPC分类号： G01N27/902 , G01N27/9046
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 times 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.
摘要翻译： 本发明涉及一种用于使用远场涡流传感器维护和管理管线的金属材料探伤仪。 将具有恒定电平并且移位了预定相位角的AC信号添加到在远场涡流传感器的接收线圈中接收到的信号，以在要测试的管线的正常非缺陷部分（例如均匀的厚度， 无孔等）。 通过防止产生异常缺陷数据，可以进行流水线的精确诊断。 可以使用AGC电路来维持在接收信号的恒定电平。 两组间隔开的接收线圈与激励线圈间隔大于预定距离（约为管道直径的两倍）。 最靠近励磁线圈的接收线圈组比其他组具有更多的线圈匝数。 该线圈配置产生具有足够信号幅度的感测线圈差分信号，以允许对管道中非缺陷和逐渐有缺陷的区域进行稳定和精确的相位检测和比较。
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3.发明授权
公开(公告)号：US5461312A
公开(公告)日：1995-10-24
申请号：US222863
申请日：1994-04-05
IPC分类号： G01N27/90
CPC分类号： G01N27/902 , G01N27/9046
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 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 times 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.
摘要翻译： 本发明涉及一种用于使用远场涡流传感器维护和管理管线的金属材料探伤仪。 将具有恒定电平并且移位了预定相位角的AC信号添加到在远场涡流传感器的接收线圈中接收的信号，以在要测试的管线的正常非缺陷部分中获得准确的相位检测（例如，均匀厚度，否 孔等）。 通过防止产生异常缺陷数据，可以进行流水线的精确诊断。 可以使用AGC电路来维持在接收信号的恒定电平。 两组间隔开的接收线圈与激励线圈间隔大于预定距离（约为管道直径的两倍）。 最靠近励磁线圈的接收线圈组比其他组具有更多的线圈匝数。 该线圈配置产生具有足够信号幅度的感测线圈差分信号，以允许对管道中非缺陷和逐渐有缺陷的区域进行稳定和精确的相位检测和比较。
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4.发明授权Remote field eddy current flaw detector for metal material including attenuator, adder, phase shiftery and phase comparator 失效用于金属材料的远场涡流探伤仪，包括衰减器，加法器，相移和相位比较器
公开(公告)号：US5365169A
公开(公告)日：1994-11-15
申请号：US014875
申请日：1993-01-28
IPC分类号： G01N27/90
CPC分类号： G01N27/902 , G01N27/9046
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.
摘要翻译： 本发明涉及一种用于使用远场涡流传感器维护和管理管线的金属材料探伤仪。 将具有恒定电平并且移位了预定相位角的AC信号添加到在远场涡流传感器的接收线圈中接收到的信号，以在要测试的管线的正常非缺陷部分（例如均匀的厚度， 无孔等）。 通过防止产生异常缺陷数据，可以进行流水线的精确诊断。 可以使用AGC电路来维持在接收信号的恒定电平。 两组间隔开的接收线圈与激励线圈间隔大于预定距离（大约管线直径的两倍）。 最靠近励磁线圈的接收线圈组比其他组具有更多的线圈匝数。 该线圈配置产生具有足够信号幅度的感测线圈差分信号，以允许对管道中非缺陷和逐渐有缺陷的区域进行稳定和精确的相位检测和比较。
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5.发明授权
公开(公告)号：US5773984A
公开(公告)日：1998-06-30
申请号：US585979
申请日：1996-01-12
摘要： A method of inspecting an abnormality occurring inside a pipe to be inspected, and an apparatus for practicing the method, which includes the steps of transmitting an electric radio or radio frequency (RF) wave having a predetermined frequency from an antenna of a transmitter located at a predetermined position inside the pipe, receiving the transmitted RF wave by an antenna of a receiver located at a predetermined position inside the pipe, and discriminating a characteristic of the received RF wave. The characteristic of the received RF wave can be the intensity of the RF wave, and an attenuation amount is detected in a first example. Alternatively, the characteristic of the received RF wave may be the time required to reflect the transmitted RF wave and receive it with the receiver, and the time interval between transmission of the RF wave and reception of the reflected RF wave is measured in this alternative.
摘要翻译： 一种检查在待检查的管道内发生的异常的方法，以及一种用于实施该方法的装置，包括以下步骤：从位于所述检测器的发射机的天线发射具有预定频率的电波或射频（RF）波 在管道内的预定位置，通过位于管道内的预定位置处的接收器的天线接收发送的RF波，并且识别所接收的RF波的特性。 所接收的RF波的特性可以是RF波的强度，并且在第一示例中检测到衰减量。 或者，所接收的RF波的特性可以是反射所发射的RF波并且用接收机接收它所需的时间，并且在该替代方案中测量RF波的发射与反射RF波的接收之间的时间间隔。
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公开(公告)号：US5612625A
公开(公告)日：1997-03-18
申请号：US544898
申请日：1995-10-18
摘要： A method of measuring the inner diameter of a pipe includes the steps of continuously transmitting RF waves of a predetermined frequency band from an antenna of a transmitter located inside of the pipe to be inspected, receiving the RF waves with an antenna of a receiver located inside the pipe, the antenna of the receiver being spaced apart from the antenna of the transmitter by a predetermined distance, detecting a frequency at a change point where an intensity of the received RF wave changes greatly, and substituting the frequency at the change point into a formula: d=c/1.706f (wherein d is the inner diameter of the pipe, c is the velocity of light, and f is the frequency at the change point) which shows the relation between the inner diameter of the pipe and the frequency to obtain a minimum inner diameter of the pipe.
摘要翻译： 一种测量管道内径的方法包括以下步骤：从位于被检测管内部的发射器的天线连续地发送预定频带的RF波，接收位于内部的接收器的天线的RF波 所述接收器的天线与所述发射机的天线间隔预定距离，检测在所接收的RF波的强度变化很大的变化点处的频率，并将所述变化点处的频率代入到 公式：d = c / 1.706f（其中d是管的内径，c是光的速度，f是变化点的频率），其示出了管的内径与频率之间的关系 以获得管的最小内径。
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