Säteilylämpömittaustekniikoiden

Säteilylämpömi or radiative heating refers to the transfer of thermal energy through electromagnetic radiation. Unlike conduction, which requires direct contact, or convection, which relies on the movement of fluids, radiative heating can occur across a vacuum. The primary mechanism for radiative heating is the emission and absorption of photons. All objects with a temperature above absolute zero emit thermal radiation. The intensity and wavelength distribution of this radiation depend on the object's temperature, according to Planck's law.

When this radiation encounters another object, a portion of it is absorbed, increasing the internal energy and thus the temperature of the absorbing object. The amount of radiation absorbed is determined by the object's emissivity and absorptivity. For example, the Sun heats the Earth through radiative heating, as its energy travels across the vacuum of space. Similarly, a fire radiates heat that warms people and objects nearby without them needing to touch the flames. In technology, radiative heating is utilized in applications such as infrared heaters, which emit infrared radiation to warm spaces, and in certain industrial processes like baking and drying. Understanding radiative heating is crucial in fields ranging from astrophysics and climate science to thermal engineering and material science, as it governs energy transfer in numerous natural and artificial systems.