Infrared thermography is defined as using thermal imaging to detect differences in temperature to identify outliers.

• A. Detecting color variations
• B. Visual inspection using thermal gloves
• C. Using thermal imaging to detect differences in temperature to identify outliers
• D. Measuring humidity differences

Answer: (C)

Infrared thermography focuses on capturing infrared radiation to map surface temperatures and identify anomalies by comparing how hot or cold different areas are. The best description says you use thermal imaging to detect differences in temperature to identify outliers, and that’s exactly what thermography does: it creates a temperature map and highlights areas that stand out from their surroundings, signaling potential faults like electrical hotspots, insulation gaps, or mechanical issues.

Color variations in a regular visual image don’t reflect temperature, so they don’t define thermography. Visual inspection using thermal gloves isn’t a measurement method and wouldn’t provide a temperature map. Humidity differences aren’t what the thermal camera directly measures; while moisture can affect heat transfer, infrared thermography detects temperature, not humidity.