Which statement is true about thermography?

• A. Destructive testing
• B. Requires physical contact for measurement
• C. Non-Destructive
• D. Only measures ambient temperature

Answer: (C)

Thermography is a non-contact method that measures surface temperature by detecting the infrared energy objects emit and turning that energy into a temperature map. Because you don’t have to touch the object and you’re not altering it while you measure, this technique is non-destructive. It simply observes how heat is distributed across a surface, which helps identify hotspots, leaks, or insulation problems without damaging anything. It doesn’t rely on the surrounding ambient air as the measurement target; it reveals the actual temperature pattern on the surface, which can be influenced by ambient conditions but is not the same as ambient temperature. So the true statement is that thermography is a non-destructive, contactless way to visualize temperature differences on surfaces.