Method and device for flaw detection by audible sound wave


PURPOSE:To perform flaw detection effective to a nonmetallic structure by using an easily obtained audible sound wave by making incident the audible sound wave from a sound wave input element on a material to be tested, and receiving the sound wave transmitted through the material to be tested by a sound wave receiver. CONSTITUTION:A magnetic tape on which a sound is recorded is reproduced by an audible sound transmitter 1 and radiated to the material 4 to be tested which is a structure made of nonmetal such as timber and concrete from the sound wave input element 2. Then the sound wave receiver 3 positioned on the opposite surface of the material 4 to be tested receives the transmitted sound wave and its output is amplified 5 and displayed on a cathode-ray tube 6. At this time, if the material 4 to be tested has a cavity (defect) 7, the consonance of the sound wave at the part which reaches the receiver 4 varies and this is drawn on the cathode-ray tube 6 and compared, thus facilitating checking whether the material 4 to be tested has the defect 7 or not.




Download Full PDF Version (Non-Commercial Use)

Patent Citations (1)

    Publication numberPublication dateAssigneeTitle
    JP-S5393886-AAugust 17, 1978Kansai Electric Power CoInspection method of steel pipe materials

NO-Patent Citations (0)


Cited By (2)

    Publication numberPublication dateAssigneeTitle
    JP-2012007982-AJanuary 12, 2012Taisei Corp, 大成建設株式会社Non-destructive density measuring device
    WO-2004008133-A1January 22, 2004Yugen Kaisha K And M, Kabushiki Kaisha Shiro KoumutenProcede et systeme de gestion de batiment