Technology
Remote magnetometry.
Survey before excavation.
Land, aerial or marine magnetic surveying is distinct from direct-contact component screening. It is used to map magnetic variations and prioritise locations for correlation and direct investigation.
Engineering boundary
The method is selected for a defined question. Screening evidence must remain separate from confirmed defect characterization, sizing, remaining-life or fitness-for-service conclusions unless those conclusions are supported by the appropriate qualified methods and engineering assessment.