What is Far Infrared rays ?

Question

let me know something about far Infrared

Answer 1

Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of radio waves. The name means "below red" (from the Latin infra, "below"), red being the color of visible light with the longest wavelength. Infrared radiation has wavelengths between about 750 nm and 1 mm, spanning three orders of magnitude.[1]



The uses of infrared include military, such as: target acquisition, surveillance, homing and tracking and non-military, such as thermal efficiency analysis, remote temperature sensing, short-ranged wireless communication, spectroscopy, and weather forecasting. Infrared astronomy uses sensor-equipped telescopes to penetrate dusty regions of space, such as molecular clouds; detect cool objects such as planets, and to view highly red-shifted objects from the early days of the universe.[2]



At the atomic level, infrared energy elicits vibrational modes in a molecule through a change in the dipole moment, making it a useful frequency range for study of these energy states. Infrared spectroscopy examines absorption and transmission of photons in the infrared energy range, based on their frequency and intensity.[3]What is Far Infrared Heat?

The electromagnetic spectrum is divided into three segments by wavelength measured in microns. 0.076 to 1.5 microns is "near" infrared, 1.5 to 5.6 microns is "middle" infrared and 5.6 to 1000 microns is "far" infrared. This invisible band of light warms objects without warming the air between the source and the object. The best example of this is the sun. Recall standing in the sun on a cold day. You felt warmth from the sun even though the air temperature was cold. This warmth you feel is far infrared penetrating your body 1.5 to 3.5 inches. Infrared heat is, therefore, a completely safe energy that raises the temperature in objects without having to heat the air in between. Approximately 80% of the sun’s rays fall into the infrared range. (This should not be confused with ultraviolet rays which are harmful to the skin.) It is not visible to the human eye but can been seen with special cameras that translate the light into visible colors.



Our bodies also radiate far infrared energy through the skin at between 3 and 50 microns. Our palms emit energy between 8 and 14 microns. (You can experience this by holding your palms near each other without touching.) Palm healing, with a 3000 year history in China, is based on the natural healing properties of far infrared.

Answer 2

Infrared is usually divided into 3 spectral regions: near, mid and far-infrared. The boundaries between the near, mid and far-infrared regions are not agreed upon and can vary. The main factor that determines which wavelengths are included in each of these three infrared regions is the type of detector technology used for gathering infrared light.



Near-infrared observations have been made from ground based observatories since the 1960's. They are done in much the same way as visible light observations for wavelengths less than 1 micron, but require special infrared detectors beyond 1 micron. Mid and far-infrared observations can only be made by observatories which can get above our atmosphere. These observations require the use of special cooled detectors containing crystals like germanium whose electrical resistance is very sensitive to heat.



Infrared radiation is emitted by any object that has a temperature (ie radiates heat). So, basically all celestial objects emit some infrared. The wavelength at which an object radiates most intensely depends on its temperature. In general, as the temperature of an object cools, it shows up more prominently at farther infrared wavelengths. This means that some infrared wavelengths are better suited for studying certain objects than others.

Answer 3

Near infrared is nearly high enough frequency to be seen as red light.

Mid infrared can be felt as heat, but it comes from a body that is nowhere near red hot.

Far infrared comes from cold bodies, so you can only detect it by making your sensor colder than what your are measuring.

Answer 4

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