FIR (far infrared) refers to an electromagnetic wave, the farthest from visible light with the longest wavelength and the lowest frequency when infrared is divided according to wavelength (length of electromagnetic wave vibration). A common characteristic of light in the infrared region is that far infrared rays have a longer wavelength than visible rays, so they are not visible to the eye. Since the wavelength is long, penetration power as well as thermal action (temperature increase effect) is strong. Since the wavelength is similar to the vibration motion inside a molecule (Scissoring, Twisting, Rocking, Wagging), resonance and resonate action on molecules is strong. Therefore, the heat action is high, making it suitable for broad use in medical applications, Heat effect on the human body is high.
Kirchhoff's Law of Radiation: The distribution of radiation does not depend on types of objects, but depends only on temperature. Blackbody : An ideal object that absorbs all incident electromagnetic radiation regardless of its frequency and angle of incidence and emits as radiant energy. In contrast to a black body, this material reflects all incidental electromagnetic radiation and is called a white body. Stefan-Boltzmabb Law : Radiant energy is proportional to the fourth power of absolute temperature, and the radiation energy curve for each wavelength according to temperature follows a specific form, dubbed the Stefan-Boltzmann Curve.
Infrared energy is measured by wavelength using FT-IR (Fourier Transform Infrared Spectroscopy, Fourier Transform-Infra/Red Spectroscopy).
Whether a material has a high far-infrared emissivity is expressed as emissivity compared to a black body at a specific temperature, which has a value between 0 and 1
FT-IR, which can measure the far-infrared emissivity of a substance, is designed to be compared at the same time by installing a blackbody furnace that can implement a black body.
Since metals have high reflectance of electromagnetic waves, far-infrared emissivity is low. It is known that ceramic-based mixtures, e.g. Si O₂ and Al₂ O₃, such as illite and zeolite have high far-infrared emissivity.
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