Lämpöemissiolähde

Lämpöemissiolähde, also known as a thermal emission source, refers to an object or phenomenon that emits electromagnetic radiation due to its temperature. This radiation is a fundamental aspect of thermodynamics and is present in all objects with a temperature above absolute zero. The characteristics of the emitted radiation, such as its intensity and spectral distribution, are directly related to the object's temperature.

The most basic model for a perfect thermal emission source is a blackbody. A blackbody is an idealized object that absorbs all incident electromagnetic radiation and emits radiation based solely on its temperature. The spectral radiance of a blackbody is described by Planck's law. Real-world objects are not perfect blackbodies, but they can often be approximated as gray bodies, which emit a fraction of the radiation a blackbody would at the same temperature.

Thermal emission is responsible for many observable phenomena. For instance, the visible light from a light bulb filament or a star is a result of thermal emission. Similarly, infrared cameras detect the thermal radiation emitted by objects to create images, even in the absence of visible light. The study of thermal emission is crucial in various scientific and engineering fields, including astrophysics, remote sensing, material science, and thermal management. Understanding these sources allows for the analysis of temperatures of distant celestial bodies, the development of efficient lighting systems, and the design of thermal protection for spacecraft.