PROBLEM TO BE SOLVED: To prevent an ultrasonic wave from being attenuated by absorbing ultrasonic vibration in a tube wall normally when an ultrasonic waveguide put into a hollow tube or an object holding the ultrasonic waveguide is brought into contact with the tube wall in an ultrasonic wave transmission line.SOLUTION: The present invention relates to an ultrasonic wave transmission line connecting an ultrasonic wave transmission part of an ultrasonic wave generation device with an ultrasonic wave reception part of an ultrasonic wave utilization device. The ultrasonic wave transmission line includes: a waterproof and flexible hollow tube a rod-shaped or tabular flexible ultrasonic waveguide disposed in a length direction inside of the hollow tube and capable of propagating a transverse wave, a longitudinal wave or Lamb wave and a support member which is disposed while being fixed on an inner wall of the hollow tube with spacing of a half wavelength or an integer multiple of the half wavelength of the ultrasonic wave, and brought into partial contact with the ultrasonic waveguide for supporting the ultrasonic waveguide in such a manner that the ultrasonic waveguide is prevented from being brought into contact with the inner wall of the hollow tube.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】超音波伝送線路において、中空の管に入れた超音波導波路又はこれを保持する物体と管壁とが接触すると、通常は超音波振動が管壁に吸収されて超音波が減衰してしまうのを防止する。【解決手段】超音波発生装置の超音波発信部と超音波利用装置の超音波受信部とを接続する超音波伝送線路であって、防水性且つ可撓性の中空管と、前記中空管内に長手方向に配置された、横波、縦波、又はラム(Lamb)波を伝搬可能な、棒状又は板状の、可撓性の超音波導波路と、前記超音波の半波長又は半波長の整数倍の間隔をおいて前記中空管の内壁に固定して配置されて、前記超音波導波路との部分的接触により前記超音波導波路を前記中空管の内壁に接触しないように支持する支持部材と、を含む。【選択図】図1
