Can a thermal imaging device detect a person in complete darkness?

A thermal imaging device works by detecting infrared radiation, which is emitted by all objects based on their temperature. In complete darkness, a person's body generates heat, which is typically higher than the surrounding environment. This heat signature allows the thermal imaging device to visualize the person, regardless of ambient lighting conditions.

Thermal imaging cameras do not require visible light to function; they rely solely on the heat emitted from objects. This capability makes them invaluable in firefighting and search-and-rescue operations, particularly in low-light or dark environments.

The notion that a person must wear a special thermally active suit or have their clothing on fire to be detected is incorrect because a thermal imaging device is designed to detect the natural body heat of individuals. Hence, the correct answer highlights the effectiveness of thermal imaging technology in identifying individuals in complete darkness.