What does a thermal imager depict?

• A. Heat Signatures of People Only
• B. Color Gradients for Aesthetics
• C. Gas Concentrations in Air
• D. Temperature Differential Between an Object and Its Surroundings

Answer: (D)

Thermal imaging works by detecting infrared radiation emitted by objects and translating it into colors that map to surface temperatures. The essential point it conveys is how temperatures differ across the scene—the temperature differential between an object and its surroundings. Hot spots and cooler areas become visible, helping you spot problems like hidden fires, electrical hotspots, or insulation issues.

This isn’t limited to showing heat signatures of people, and it isn’t meant to display gas concentrations or be a purely decorative color gradient. The colors carry temperature information, not arbitrary aesthetics, and the technique itself is about temperature patterns across surfaces.