| 摘要 |
An ultrasonic inspection method for inspecting a first article. The method comprises, in a first inspection process:
measuring the distance between a first surface of the first article and a nominal axis at three or more measurement locations along the axis of the surface;
using the measured distances to produce a mathematical model of the surface of the first article;
transmitting an ultrasonic wave from a first side of the first article through the first surface of the first article at a plurality of inspection locations along the axis of the first surface, and receiving a transmitted waveform which has passed through at least part of the first article;
using the model to normalise each transmitted waveform at each inspection
location to the nominal axis; and
identifying a signature signal from the normalised transmitted waveform at each inspection location. |
