Infrared radiation is something we often hear about in our daily lives, but what exactly is it? Here, I will briefly explain it from the perspective of infrared heaters.
Infrared is referred to as "Infrared" in English. This term combines the prefix "Infra," meaning "below," with "red," which means "red." In fact, infrared is a type of electromagnetic wave that is located adjacent (outside) to the "red" part of the "visible light" that we usually see. The diagram above shows the types of electromagnetic waves, and the numbers on the scale indicate the wavelengths of these waves. As you can see, electromagnetic waves are classified by their wavelengths into categories such as radio waves (like those used in mobile phones), ultraviolet rays, X-rays, etc. Among these, the range of 10^-3 to 10^-6 (0.7um to 1,000um) corresponds to infrared. You can see that the color red, which is part of visible light, is next to it, and this helps explain why it is called "infrared."
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◆Why does infrared make us feel warm? So, why do we feel warm from infrared? It gets a bit complicated, but the infrared electromagnetic waves that are emitted reach and are absorbed by materials, causing the vibrations of the molecules in that area to increase. As the motion (vibration) of the molecules, which is thermal energy, increases, the thermal energy rises, making it warmer. This is precisely why the sun feels warm, thanks to infrared. As I will explain later, among infrared waves, "mid-infrared" and "far-infrared" particularly match the vibration frequencies of the human body (skin molecules), allowing them to efficiently warm the capillaries on the body surface, which is said to have a significant heating effect. ◆How is infrared generated? Now, how is the infrared we have discussed generated? In fact, materials with temperature emit infrared radiation in amounts corresponding to their temperature. Our human bodies also emit it. Infrared heaters generate a lot of infrared by passing electric current through a "heating element" and heating it to several hundred degrees. The "heating elements" used in infrared heaters come in various types to efficiently emit infrared radiation.
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There are different types of infrared radiation. Infrared radiation can be divided into three categories based on the wavelength of electromagnetic waves. The advantages and disadvantages of these are shown below. (The classification of infrared radiation varies slightly according to international standards and domestic industries, and the following classification is for reference.) 1. Near-infrared This type of infrared radiation has a wavelength range of approximately 0.7 to 2.5 micrometers and possesses characteristics closest to the red color of visible light. It has the lowest heating effect among infrared types but has the fastest response time. It is commonly used in mobile infrared communication and remote controls for home appliances. 2. Mid-infrared This type of infrared radiation has a wavelength range of approximately 2.5 to 4 micrometers and possesses characteristics of both near-infrared and far-infrared. 3. Far-infrared This type of infrared radiation has a wavelength range of approximately 4 to 1,000 micrometers and has characteristics that are the farthest from visible light. It has the highest heating effect among infrared types and is used in heating devices and oven toasters.
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"Chrester" is a brand delivered by Confor Co., Ltd., with the concept of providing "the ultimate comfortable space" through various outdoor cooling and heating devices that can be easily installed for customers to enjoy "places of relaxation" such as terrace seating at restaurants and residential exteriors.