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    • 15. 发明授权
    • Apparatus and method for inspecting the profile of the inner wall of a
tube employing a wall follower and an eddy current probe
    • 用于检查使用壁跟随器和涡流探针的管的内壁的轮廓的装置和方法
    • US4876506A
    • 1989-10-24
    • US205768
    • 1988-06-13
    • Stephen D. BrownWarren R. JunkerFrancis X. Gradich
    • Stephen D. BrownWarren R. JunkerFrancis X. Gradich
    • G01B11/24G01B7/13G01B7/28
    • G01B7/281G01B7/13
    • Both an apparatus and method for accurately inspecting the profile of the inner wall of a conduit, such as a heat exchanger tube in a steam generator, is disclosed herein. The apparatus comprises a cylindrical probe body that is insertable within the tube, a probe assembly disposed within the probe body that includes an eddy current sensing coil and a copper plate which are movable with respect to one another, and a wall follower assembly including a stylus on one end and which is linked to the probe assembly on its other end for converting changes in the radius of the tube wall into changes in the distance between the eddy current sensing coil and the copper plate. A ferrite core is disposed within the sensing coil for focusing the electromagnetic flux into the copper plate. Additionally, the sensing coil is serially connected to a balancing coil in order to provide an accurate zero point for the sensing coil. In the preferred embodiment, the sensing coil is stationarily mounted within the probe body, while the copper plate is connected to the radially movable stylus assembly. The probe body and all of the components of the wall follower assembly including the springs which resiliently urge the stylus toward the tube wall are formed from nonconductive plastic materials so as to maximize the electromagnetic coupling between the eddy current sensing coil and the copper plate. The apparatus is capable of accurately detecting not only localized flaws within the inner tube wall, but also tube ovality and wall thinning which are typically caused by the deposition of sludge in the crevice regions of tubesheets and support plates of steam generators.
    • 本文公开了用于精确地检查导管(例如蒸汽发生器中的热交换器管)的内壁的轮廓的装置和方法。 该装置包括可插入管内的圆柱形探针主体,设置在探针主体内的探针组件,其包括可相对于彼此移动的涡流检测线圈和铜板,以及包括触针 并且其另一端连接到探针组件,用于将管壁的半径变化转换为涡流感测线圈与铜板之间的距离的变化。 在感测线圈内设有铁氧体磁芯,用于将电磁通量聚焦到铜板中。 此外,感测线圈串联连接到平衡线圈,以便为传感线圈提供精确的零点。 在优选实施例中,感测线圈固定地安装在探针主体内,而铜板连接到可径向移动的触笔组件。 探针体和包括将触针朝向管壁弹性推动的弹簧的壁随动体组件的所有部件由非导电塑料材料形成,以便使涡流感测线圈和铜板之间的电磁耦合最大化。 该装置能够精确地检测内管壁内的局部缺陷,而且能够精确地检测通常由蒸汽发生器的管板和支撑板的缝隙区域中的淤渣沉积引起的管椭圆度和壁变薄。