When is thermography typically used in NDT?

Thermography is primarily utilized in non-destructive testing (NDT) to detect thermal anomalies or inefficiencies in thermal systems. This method leverages infrared imaging technology to visualize temperature variations across a surface, allowing inspectors to identify issues such as overheating components, insulation failures, or leaks in thermal systems. Such temperature differences can indicate problems that are not immediately visible through other inspection methods, making thermography a valuable tool in preventive maintenance and ensuring the efficient operation of systems.

The other options relate to different types of inspections. Measuring electrical resistance pertains to electrical testing procedures, while examining structural integrity focuses on physical assessments through mechanical methods. The assessment of hardness is typically achieved through hardness testing techniques, which measure a material's resistance to deformation. Each of these methods serves distinct purposes in NDT and does not utilize the thermal imaging capabilities inherent to thermography.