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An infrared sauna uses infrared heaters to emit infrared light experienced as radiant heat which is absorbed by the surface of the skin. Infrared saunas are popular in alternative therapies , where they are claimed to help with a number of medical issues including autism , cancer , and COVID-19 , but these claims are entirely pseudoscientific .
The efficiency of an infrared heater is a rating of the total energy consumed by the heater compared to the amount of infrared energy generated. While there will always be some amount of convective heat generated through the process, any introduction of air motion across the heater will reduce its infrared conversion efficiency.
These heaters are often designed such that the frequency of the emitted waves are in the infrared part of the electromagnetic spectrum. The materials used in radiant heaters can vary. Halogen heaters have tungsten filaments in sealed quartz envelopes, mounted in front of a metal reflector in a plastic case. They operate at a higher temperature ...
Infrared heating uses infrared lamps, commonly called heat lamps, to transmit infrared radiation to the body that is being heated. When a body with a large surface area needs to be heated, an array of infrared lamps is often used. The lamp commonly contains an incandescent bulb that produces infrared radiation.
Gold-coated – HeLeN quartz infrared heat lamps as originally patented and manufactured by Philips. A gold dichroic film is deposited on the inside that reduces the visible light and allows most of the short and medium wave infrared through. These tubular quartz lamps are designed for services other than illumination. [11]
Contaminants, because they absorb more light and heat than the glass does, will create a hot spot on the bulb surface when the lamp is turned on. This extreme, localized heat causes the quartz to change from its vitreous form into a weaker, crystalline form that leaks gas. This weakening may also cause the bulb to form a bubble, weakening it ...
A ceramic heater as a consumer product is a space heater that generates heat using a heating element of ceramic with a positive temperature coefficient (PTC). [ 1 ] [ 2 ] [ failed verification ] Ceramic heaters are usually portable and typically used for heating a room or small office, and are of similar utility to metal-element fan heaters .
There are advantages and disadvantages to using each. For quartz, blue or green excitation wavelengths are normally used and the near ultra-violet emission is measured (Anti-Stokes shift). For potassium feldspar or silt-sized grains, near infrared excitation (IRSL) is normally used and the violet/blue emissions are measured.