What is Infrared (IR)?

Infrared (IR) beam is one of many types of light that make up the electromagnetic (EM) spectrum, and the wavelengths of visible light are between 4000 and 7000 A, or between 0.4 and 0.7 microns. That is, the wavelengths of infrared light range from 0.78 to 10,000 thousandth of a millimeter, and its frequency ranges from 0.3 to 384 trillion hertz.

What is Infrared (IR)?

What Does Infrared Mean, Where Is It Used?

Astronomers usually divide the infrared part of the electromagnetic spectrum into IR (0.78 to 1.1 micron), middle IR (1.2 to 15 micron), and distant IR (16 to 100 micron), close to their wavelength.


The infrared ray was discovered in 1800 by the German-born British astronomer William Herschel. Herschel was interested in learning how much heat passed through the colored filters he observed, as he realized that the amount of heat they transmitted was color-dependent.

Herschel thought that colors could filter different amounts of heat, so he designed a very original experiment to test his hypothesis and created a mercury thermometer in the spectrum obtained by the glass prism to measure the heat emitted by each color.

Although he later observed that there was no light, he discovered that the temperature was stronger next to the red stripe of the spectrum. This was his first experience to show that heat can be transferred in an invisible form of light.

Herschel used these calorie rays as a very popular name throughout the 19th century and eventually called it the most modern infrared ray.

The first infrared ray detector was the bolometer, a device that captured the beam due to the increase in temperature produced in an absorbent detector.

Infrared Features

Infrared is a type of light that cannot be seen with the eyes, and it shows the temperature of an object by providing special information that cannot be obtained from visible light.

The name infrared means that it is under red because its beginning is adjacent to or close to the red color of the visible spectrum.

Usage Areas

Infrared is used when night vision equipment is insufficient to see objects.

However, the temperature of the invisible object is taken by rays and then reflected on a screen. The hottest objects appear in the brightest state.

As an example of very common use, it is used by remote controllers that use IR instead of radio waves because they do not interfere with other signals such as television signals.

Its computers are also used to communicate with peripherals at close range and to transfer data.

The light used in optical fibers is usually infrared beam technology.

Radiant heat is an energy structure that directly heats objects through a process called conversion, without having to heat the air between them, and since the Sun is the main source of radiant energy reaching Earth, this heat is also called infrared energy.

In addition, the benefit of using it in the field of health is that it appears as an important force that causes an increase in white blood cells.

The use of this technology in the field of health is a very good job because when the white blood cell is more, it offers immunity, good health, and a better quality of life.

Today, many new technologies are used in many medical fields such as hyperthermic detoxification therapies and cancer treatment by applying distant IR rays to healthcare products.

The purpose of this is to accelerate the healing process by giving heat to the damaged place.

Another of the many uses of the IR beam is the use of IR emitting equipment in the industrial sector.

Examples of use in this field include drying paints and varnishes, paper drying, thermofixing of plastics, preheating resources, bending, tempered, and laminated glass processes.

IR Cameras

Private IR cameras have helped save people’s lives as well as benefiting in many areas.

Thanks to these cameras, which help ensure the security of a particular area, even objects that emit less heat from trees and soil can be observed.

In nature, every substance emits radiation, so the wavelength that a body emits maximum radiation is inversely proportional to its temperature. In this way, most objects have maximum emissions in infrared in hot weather.

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