Infrared Radiation Wavelength and Frequency
We already know that the wavelength of infrared radiation is between 700 nm to 1 mm, which is between the red limit of the visible spectrum. But the following is the classification of bands based on the spectral range 1µm and 50µm:
- 1µm to 3µm, which is known as Band I or Short Wave Infrared
- 3µm to 5µm, which is known as the Band II or Middle Wave Infrared
- 8µm to 14µm, which is known as the Band III or Long Wave Infrared
Near-infrared |
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Short wavelength infrared |
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Medium infrared |
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Long-wavelength infrared |
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Far infrared |
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What is Infrared (IR)?
Infrared (IR) is a type of electromagnetic radiation that has longer wavelengths than visible light, making it invisible to the human eye. It falls just beyond the red portion of the visible spectrum, hence its name meaning “below red.” Infrared radiation can carry heat and is commonly emitted by objects like the sun, light bulbs, and even living beings.
This radiation is used in various applications, including remote controls, night-vision devices, and thermal imaging cameras, as well as in telecommunications and some scientific research
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