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1. 发明授权

US4507608A Method and arrangement using a pair of resonant circuits for determining and indicating the position of an uneveness in the inner surface of pipes or other types of cylindrical structures 失效
标题翻译：使用一对谐振电路的方法和装置，用于确定和指示管道或其它类型的圆柱形结构的内表面中的不均匀的位置
公开(公告)号：US4507608A
公开(公告)日：1985-03-26
申请号：US356794
申请日：1982-03-10
申请人： Jurgen Flach, deceased , Rigobert Opitz , Heinz Daugart , Hans-Gunter Baden
发明人： Jurgen Flach, deceased , Rigobert Opitz , Heinz Daugart , Hans-Gunter Baden
IPC分类号： G01B7/28 , G01N27/82 , G01R27/26
CPC分类号： G01B7/28
摘要： Method for determining the position and depth of unevenness in an inner surface of a pipe with the aid of a scanning head which is adapted to travel through the pipe and which is rotatable about the pipe axis. The invention provides an inductive, or capacitive, depth scanning process, which operates in a contact-free manner with respect to the inner pipe surface. This is attained by means of an inductive method in that, as is illustrated in the drawing, there is arranged at a distance from the pipe inner surface the scanning head which is guided and in which a coil (2) of a measuring, resonant circuit is mounted and, above the inner periphery of the pipe, a coil 1 of a reference, resonant circuit is arranged, and then, after the frequencies of both resonant circuits have been brought, prior to measuring, to an identical value in each of a multiplying circuit (10, 7, 13 respectively 11, 8, 14), they are measured and converted into an adjustable difference of the multiplied frequencies (f.sub.1, f.sub.2) in an analog-digital converter (18) and conducted to a microprocessor ( 19) as a signal with respect to the unevenness, and from there are conducted to an evaluation unit (20). With the capacitative depth scanning method, the frequency difference is attained by adjusting the capacity of the resonant circuits.
摘要翻译：借助于扫描头来确定管道内表面的凹凸的位置和深度的方法，所述扫描头适于穿过所述管道行进并且可围绕管轴线旋转。本发明提供一种电感式或电容式深度扫描方法，其以相对于内管表面的无接触方式工作。这是通过感应方法实现的，因为如图所示，布置在与管内表面一定距离的位置，该扫描头被引导，并且其中测量谐振电路的线圈（2）并且在管的内周上方配置有基准线圈1，共振电路被配置，然后，在两个谐振电路的频率在测量之前，在a的每一个中具有相同的值乘法电路（10,7,13分别为11,8,14），它们被测量并转换成模拟数字转换器（18）中的相乘频率（f1，f2）的可调差分，并传送到微处理器（19））作为相对于不均匀性的信号，并且从导向到评估单元（20）。通过电容深度扫描方法，通过调节谐振电路的容量来实现频差。

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