The keyword for this is NDT - non destructive testing. There are X-ray, computed tomography, and other modalities. Micro CT is frequently used. I personally use

The keyword for this is NDT - non destructive testing. There are X-ray, computed tomography, and other modalities. Micro CT is frequently used. I personally use X-ray a lot but can't recommend any vendors in SE Asia. Delphi Precision is a high end vendor in the US. Some cool animations here: https://www.delphiprecisionimaging.com/aerospace-ndt https://www.delphiprecisionimaging.com/aerospace-ndt