Tell about Infrared ?

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Infrared waves, or infrared light, are part of the electromagnetic spectrum. People encounter Infrared waves every day; the human eye cannot see it, but humans can detect it as heat.

to change channels on your TV. This region of the spectrum is divided into near-, mid-, and far-infrared.

The region from 8 to 15 microns (µm) is referred to by Earth scientists as thermal infrared since these wavelengths are best for studying the longwave thermal energy radiating from our planet.

n 1800, William Herschel conducted an experiment measuring the difference in temperature between the colors in the visible spectrum

He placed thermometers within each color of the visible spectrum. The results showed an increase in temperature from blue to red.

. When he noticed an even warmer temperature measurement just beyond the red end of the visible spectrum, Herschel had discovered infrared light!

We can sense some infrared energy as heat. Some objects are so hot they also emit visible light—such as a fire does

Other objects, such as humans, are not as hot and only emit only infrared waves.

Our eyes cannot see these infrared waves but instruments that can sense infrared energy—such as night-vision goggles or infrared cameras

The light we see with our eyes is really a very small portion of what is called the "Electromagnetic Spectrum." The Electromagnetic Spectrum includes all types of radiation - from the X-rays used at hospitals, to radio waves used for communication, and even the microwaves you cook food with.

Radiation in the Electromagnetic Spectrum is often categorized by wavelength. Short wavelength radiation is of the highest energy and can be very dangerous - Gamma, X-rays and ultraviolet are examples of short wavelength radiation.

Longer wavelength radiation is of lower energy and is usually less harmful - examples include radio, microwaves and infrared. A rainbow shows the optical (visible) part of the Electromagnetic Spectrum and infrared (if you could see it) would be located just beyond the red side of the rainbow.

Although infrared radiation is not visible, humans can sense it - as heat. Put your hand next to a hot oven if you want to experience infrared radiation "first-hand!

Astronomers have found that infrared radiation is especially useful when trying to probe areas of our universe that are surrounded by clouds of gas and dust. Because of infrared's longer wavelength,

it can pass right through these clouds and reveal details invisible by observing other types of radiation. Especially interesting are areas were stars and planets are forming and the cores of galaxies where it is believed huge black holes might reside

Astronomers use special sensors to detect infrared radiation from space, but it's not easy. Because heat is given off by many objects (including the telescope and cameras themselves), everything must be carefully designed, and/or cooled to very cold temperatures.

Gemini has been designed to perform especially well when observing infrared radiation. This includes selecting the locations for the telescopes. Both scopes are located on high mountains where the air is very dry

Since atmospheric water vapor absorbs, or "soaks-up", infrared radiation, this was a very important consideration when selecting the sites for the Gemini telescopes. Gemini will also use special Silver coatings on its mirrors to reflect significantly more infrared radiation than the metals (usually aluminum) used on most other telescope mirrors.

Infrared radiation is a type of electromagnetic radiation, as are radio waves, ultraviolet radiation, X-rays and microwaves. Infrared (IR) light is the part of the EM spectrum that people encounter most in everyday life, although much of it goes unnoticed. It is invisible to human eyes, but people can feel it as heat.

Infrared astronomy
The California Institute of Technology (CalTech) describes infrared astronomy as "the detection and study of the infrared radiation (heat energy) emitted from objects in the universe." Advances in IR CCD imaging systems have allowed for detailed observation of the distribution of IR sources, revealing complex structures in nebulae, galaxies and the large-scale structure of the universe.

infrared waves, or infrared light, are part of the electromagnetic spectrum. People encounter Infrared waves every day; the human eye cannot see it, but humans can detect it as heat.

The IR LED (or infrared light-emitting diode) module sends out light with longer wavelengths than visible light, similar to the light in your remote control. It’s invisible to the eye, but many digital cameras can see it! Try using it to activate the light sensor or remote trigger.

A remote control uses light waves just beyond the visible spectrum of light—infrared light waves—to change channels on your TV. This region of the spectrum is divided into near-, mid-, and far-infrared. The region from 8 to 15 microns (µm) is referred to by Earth scientists as thermal infrared since these wavelengths are best for studying the longwave thermal energy radiating from our planet.

In 1800, William Herschel conducted an experiment measuring the difference in temperature between the colors in the visible spectrum. He placed thermometers within each color of the visible spectrum. The results showed an increase in temperature from blue to red. When he noticed an even warmer temperature measurement just beyond the red end of the visible spectrum, Herschel had discovered infrared light!