Why are polished metals difficult to measure accurately with infrared thermography?

Why are polished metals difficult to measure accurately with infrared thermography?

Why are polished metals difficult to measure accurately with infrared thermography? A) They absorb too much heat B) They have very high emissivity C) They reflect infrared radiation strongly D) They produce electrical interference Correct Answer: C) They reflect infrared radiation strongly Infrared thermography measures surface temperature by detecting infrared radiation emitted by an object. The key factor here is emissivity - how well a surface emits thermal radiation. High emissivity → Accurate temperature reading Low emissivity → Poor accuracy Behavior of Polished Metals Polished metals (like aluminum, stainless steel, copper) have: Very low emissivity (typically 0.02–0.1) Very high reflectivity This means: Instead of emitting their own heat, they reflect infrared radiation from surrounding objects. Why This Causes Measurement Errors When you point a thermal camera at polished metal: The camera doesn’t see the true temperature of the metal It mostly detects reflected temperatures from: Nearby equipm…