| 摘要 |
<p>Device has a frame (4) with flexible and/or articulated structure, at the base of which are four railway wheels (5), the frame bearing lower part is a transverse (10) bar with carry-probes (23) placed respectively on each one on its two sides between the two wheels so as to take seat above the one the two rails, each carry-probes carry at least an ultrasonic transducer (27), having at least an element piezoelectric, and connected to average transmitters and/or receivers of ultrasonic waves.</p> |
