-
1.
公开(公告)号:US5734588A
公开(公告)日:1998-03-31
申请号:US669699
申请日:1996-06-24
IPC分类号: G01N29/04 , G01N29/26 , G01N29/265 , G01N29/34 , G01N29/12
CPC分类号: G01N29/26 , G01N29/043 , G01N29/2487 , G01N29/265 , G01N29/341 , G01N2291/011 , G01N2291/012 , G01N2291/014 , G01N2291/015 , G01N2291/0421 , G01N2291/044 , G01N2291/052 , G01N2291/056 , G01N2291/106 , G01N2291/2634 , G01N2291/2636
摘要: Guided ultrasonic waves are used for the detection of defective tubes in a heat exchanger or steam generator by using a transducer which generates a guided wave at predetermined parameters of phase velocity and frequency to operate at a point on a dispersion curve which minimizes leakage of ultrasonic energy to fluid surrounding the tube. Various techniques of generating ultrasonic waves of various phase velocities such as a comb type filter allow phase velocity points on a dispersion curve to be freely selected.
摘要翻译: 引导超声波用于通过使用在相位速度和频率的预定参数上产生导波的换能器来检测热交换器或蒸汽发生器中的有缺陷的管,以在扩散曲线上的点处操作以最小化超声波能量的泄漏 围绕管的流体。 产生各种相位速度的超声波的各种技术,例如梳状滤波器,可以自由选择色散曲线上的相位速度点。