Template:Short description Template:More citations needed
Far infrared (FIR) or long wave refers to a specific range within the infrared spectrum of electromagnetic radiation. It encompasses radiation with wavelengths ranging from 15 μm (micrometers) to 1 mm, which corresponds to a frequency range of approximately 20 THz to 300 GHz. This places far infrared radiation within the CIE IR-B and IR-C bands.<ref name=Byrnes>Template:Cite book</ref> The longer wavelengths of the FIR spectrum overlap with a range known as terahertz radiation.<ref name=Glagoleva>Template:Cite journal</ref> Different sources may use different boundaries to define the far infrared range. For instance, astronomers often define it as wavelengths between 25 μm and 350 μm.<ref name=caltech>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Infrared photons possess significantly lower energy than photons in the visible light spectrum, with tens to hundreds of times less energy.<ref>Template:Citation</ref>
ApplicationsEdit
AstronomyEdit
{{#invoke:Labelled list hatnote|labelledList|Main article|Main articles|Main page|Main pages}} Objects within a temperature range of approximately 5 K to 340 K emit radiation in the far infrared range as a result of black-body radiation, in accordance with Wien's displacement law. This characteristic is utilized in the observation of interstellar gases, which are frequently associated with the formation of new stars.
The brightness observed in far infrared images of the center of the Milky Way galaxy arises from the high density of stars in that region, which heats the surrounding dust and induces radiation emission in the far infrared spectrum. Excluding the center of the Milky Way galaxy, the galaxy M82 is the most prominent far-infrared object in the sky, with its central region emitting amounts of far infrared light equivalent to the combined emissions of all the stars in the Milky Way. Template:As of, the source responsible for heating the dust at the center of M82 remains unknown.<ref name="caltech" />
Human body detectionEdit
Certain human proximity sensors utilize passive infrared sensing within the far infrared wavelength range to detect the presence of stationary<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> and/or moving human bodies.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
HeatingEdit
Infrared heating (IR) is a method of heating an area through more efficient results than gas or electric convection heating. Studies show IR heats faster, more uniformly, and more efficiently than a traditional conventional system.<ref name=":0">Template:Cite journal</ref><ref>Template:Cite journal</ref> Increasingly, IR heating is utilised as part of scheme designs to achieve spot, zonal and smart heating within occupation zones within a building.<ref name=":0" /> Though multiple applications of long wave or FIR heating exist, a common representation comprises radiant panel heaters. Radiant panel heaters typically contain a grid of resistance wire or ribbons which are sandwiched between a thin plate of electrical insulation on an emitting die and thermal insulation on the back side.<ref>Template:Cite book</ref> Owing to their size and flexibility,<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> infrared panel heaters can be fitted on walls and ceilings for added-space saving benefits. Electric FIR panel heaters are shown to have up to 98.5% efficiency from supply to production of heat with satisfactory thermal comfort, thermostatic control, and with low initial investment.<ref>Template:Cite journal</ref>
Therapeutic modalityEdit
Template:Advert section Researchers have observed that among all forms of radiant heat, only far-infrared radiation transfers energy solely in the form of heat that can be sensed by the human body.<ref>Template:Cite journal</ref> They have found that this type of radiant heat can penetrate the skin up to a depth of approximately Template:Convert. In the field of biomedicine, experiments have been conducted using fabrics woven with FIR-emitting ceramics embedded in their fibers. These studies have indicated a potential delay in the onset of fatigue induced by muscle contractions in participants.<ref>Template:Cite journal</ref> The researchers have suggested that the emission of far-infrared radiation by these ceramics (referred to as cFIR) could facilitate cellular repair.
Certain heating pads have been marketed to provide "far infrared" therapy, which is claimed to offer deeper penetration.Template:Citation needed However, the infrared radiation emitted by an object is determined by its temperature.Template:Citation needed Therefore, all heating pads emit the same type of infrared radiation if they are at the same temperature. Higher temperatures will result in greater infrared radiation, but caution must be exercised to avoid burns.