Method for nondestructive evaluation using ultrasonic excitation and rotation of the inspection object or inspection system

A system for nondestructive defect detection, the system comprising:

• one or more excitation devices, wherein the one or more excitation devices are couplable to a device under inspection and configured to generate one or more excitation signals;
• and
• a scanning system configured to scan an exterior surface of the device under inspection and to collect sensor signals, wherein the sensor signals are produced as a result of interactions between the one or more excitation signals and features of the device under inspection, wherein either the device under inspection is rotated about an axis for a duration of the scanning or the scanning system is rotated around the device under inspection for the duration of the scanning, and wherein a presence or lack of a defect in the device under inspection is determined based at least in part on the sensor signals,
• wherein the system is configured for detecting differences in wavefield responses captured at the exterior surface of the device under inspection, and wherein detecting differences in the wavefield responses comprises:
• determining a first wavenumber spectrum of a first region surrounding a point of interest;
• determining a second wavenumber spectrum of a second region surrounding the point of interest;
• and
• determining local anomalies based on comparing the first wavenumber spectrum to the second wavenumber spectrum.