| 摘要 |
<p>A method of inspecting tubular members, especially of measuring the wall thickness of the tubular member, said method comprising the steps of inserting a measuring probe with an ultrasonic transducer (12) for transmission of an ultrasonic pulse to the wall of the tubular member and for detection of the ultrasonic pulses reflected by the inner and outer side of the tubular wall. The measuring probe comprises an inclined mirror guiding the ultra-sound transmitted by the transducer in form of a beam in order to scan the tubular member along a substantially helical path during the insertion of the probe, an ultra-sound-transmitting fluid being fed to the annular space between the measuring probe and the tubular member during the scanning. According to the invention, the rotating mirror (22) is placed in a preferably closed chamber (20) filled with fluid, said chamber (20) being rotated together with the mirror (22) and comprising an ultrasonic window for the transmitted ultrasonic beam. Accordingly, the turbulence is reduced in the fed water. As a result, the risk of air bubbles interfering with the measurement has been considerably reduced, and accordingly it is possible to scan at a higher speed than previously.</p> |
