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What are infrared rays?
It has long been known that the warmth from the sun is transmitted through infrared rays. These rays have wavelength between visible light and microwaves and are invisible to the human eye. The wavelength range is between 0.76 and 1,000 microns (a micron is one-millionth of a meter).
Infrared rays are further divided into near, mid, and far infrared rays according to their wavelengths. Far infrared rays are those in the spectrum of 4 microns or greater.
Far infrared rays with wavelengths ranging from 2.5 to 30 microns are absorbed by a variety of plastics, paints, fibers and foods. Far infrared rays therefore have a wide range of applications in industry, including a heat source for heating and drying. The properties of infrared rays are also used in applications such as OPTEX automatic door sensors.
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Classification of electromagnetic waves and infrared rays