Conclusions and Further Work
Simulation results using the new phased array probe design have shown that it meets the required
specification. A 2.5 mm beam spot size is achieved at all inspection depths and for all of the required
steering angles. The probe achieves the ± 3° of beam steering requirement with a maximum sidelobe amplitude at
least 7.6dB smaller than the main beam. The probe design should therefore deliver a consistent sensitivity
level for all inspections, and be able to compensate for probe misalignment.
Trial measurements using the eddy current system have demonstrated its capability to detect 0.8 mm flat bottom holes of 40% through wall thickness and 5 mm long slots of 10% through wall thickness. This indicates that it will deliver reliable detection of flaws in the ultrasonic dead zone.
The next task is to integrate the two inspection systems into the mechanical mounting, and to verify their performance. Both systems will also be assessed for their ability to cope with the mechanical movement of the system when used on manufactured titanium billets.
