There are three types of infrared rays with different irradiance, efficiency and irradiance values:
- IR-A or NIR-A (type A Infrared Rays) or Short Wave Infrared Rays;
- IR-B or MIR-B (type B Infrared Rays) or Medium Wave Infrared Rays;
- IR-C or FIR-C (type C Infrared Rays) or Long Wave Infrared Rays, also called FIRs, which can be considered as the good part of the sun’s infrared radiation. In contrast, prolonged exposure to IR-A and IR-B can be harmful to living organisms. A living body absorbs and simultaneously radiates far-infrared waves because its water molecules and protein structures oscillate at the same frequency as the FIRs. Therefore, considering that living organisms are mostly composed of water, the action of FIRs on them facilitates purification and cellular metabolism in general.
Several studies claim that FIRs strengthen the immune system and improve the blood circulation process of skin, muscles and connective tissues by supplying more oxygen and nutrients. Far-infrared radiant elements are used to warm newborn babies in incubators in paediatric wards and are also widely used in other medical and therapeutic areas.