The advantage is now that broad bandwidth transducers can permit the generation of more modes and improve probability of detection, classification and sizing. We also have to select the appropriate mode to get the best sensitivity to your particular type of defect. The limitations are that lamb waves are not practical for material thicker than 0.25 inch and a basic understanding of flaw geometry is required. Lamb wave techniques may be faster and more effective for ultrasonic inspection of certain geometries. Piezocomposite transducer technology enhances these methods.
Experimental results demonstrate the usefulness of the technique.
This was incorporated into the above review. It was interesting listening to a lecture in Seattle about an application which the writer had already applied years ago in the plastics market. Also, the system works very fast with PRF of 10 KHz for each channel - essential for use in the production process. The design watches carefully for compensation of temperature influences, which can be caused by water. One attendee asked if the system could be used for coated tubes as well, and give an additional result of the coating thickness.