Infrared is something we often hear about in our daily lives, but what exactly is it? Here, we 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," and "red," which means "red." In fact, infrared is a type of electromagnetic wave that is located just outside (to the side of) the "red" part of the "visible light" that we usually see. The diagram above shows the types of electromagnetic waves, with the numbers on the scale indicating the wavelengths of these waves. As you can see, electromagnetic waves are classified into categories such as radio waves for mobile phones, ultraviolet rays, X-rays, etc., based on their wavelengths. 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 with infrared? It gets a bit complicated, but when the infrared electromagnetic waves are emitted and reach a substance, they are absorbed, causing the molecules in that area to vibrate more. As the motion (vibration) of the molecules, which is thermal energy, increases, the thermal energy rises, making us feel warm. 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 human bodies (skin molecules), allowing them to efficiently warm the capillaries at the surface of the body, resulting in a significant heating effect. ◆How is infrared created? Now, how is the infrared we just discussed created? In fact, substances with temperature emit a certain amount of infrared radiation 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," raising its temperature 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 based on international standards and domestic industries, so 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 that are closest to the red color of visible light. Its heating effect is the lowest among infrared types, but it 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 radiation. 3. Far-infrared This type of infrared radiation has a wavelength range of approximately 4 to 1,000 micrometers and has characteristics that are farthest from visible light. Its heating effect is the highest 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.