Which statement describes what thermography primarily measures?

Which statement describes what thermography primarily measures?

• A. Temperature by detecting infrared radiation from objects
• B. Color features of the scene
• C. Acoustic emissions
• D. Magnetic fields

Answer: (A)

Thermography measures temperature by detecting infrared radiation emitted by objects. An infrared camera senses this radiant energy and converts it into a temperature map, since hotter areas emit more infrared energy than cooler ones. This non-contact method works because all objects above absolute zero give off infrared radiation, with the detected amount influenced by factors like emissivity and distance. The colors in a thermographic image are simply a visual scale representing temperature, not the true visible colors of the scene. The other choices refer to aspects that aren’t thermography (visible color features, sound, or magnetic fields).

Thermography measures temperature by detecting infrared radiation emitted by objects. An infrared camera senses this radiant energy and converts it into a temperature map, since hotter areas emit more infrared energy than cooler ones. This non-contact method works because all objects above absolute zero give off infrared radiation, with the detected amount influenced by factors like emissivity and distance. The colors in a thermographic image are simply a visual scale representing temperature, not the true visible colors of the scene. The other choices refer to aspects that aren’t thermography (visible color features, sound, or magnetic fields).