| 摘要 |
The invention concerns a device for interrupting acoustic impedance of a rod (3) whereon a deformation wave can be propagated, comprising a mass (20) including an element forming a nut (7) and an element forming a lock nut (9), said element forming a nut (7) and said element forming a lock nut (8) having an acoustic impedance much higher than the acoustic impedance of said rod (3), the clamping of the element forming a nut (7) and of the element forming a lock nut (9) being carried out until a deformation of at least part of the threads of the first and/or second threaded zones (16) of the rod (3) greater than the maximum deformation of the rod is obtained (3).
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