| 摘要 |
The invention relates to a method and system for ultrasonic time of flight diffraction inspection of a plastics wall, such as a pipe wall. The method comprises providing an ultrasound transmitter and transmitting an ultrasound signal having a nominal frequency into the wall, providing an ultrasound receiver and receiving the ultrasound signal transmitted through the wall. The ultrasound signal provided by the transmitter has a bandwidth of more than 80%, preferably more than 100% of the nominal frequency of the ultrasound signal provided by the transmitter.
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