What Are the Most Common Uses of Infrared?

Sun rays can be roughly divided into visible light and invisible light. Visible light will refract the light (spectrum) of purple, blue, cyan, green, yellow, orange, and red colors after passing through the prism. The light outside the red light, in the spectrum from 0.75 to 1000 microns, is called infrared light, also known as infrared. Infrared belongs to the category of electromagnetic waves and is a kind of electromagnetic waves with strong thermal effects ^[1] . The wavelength range of infrared rays is very wide. People divide infrared rays of different wavelength ranges into near-infrared, mid-infrared and far-infrared regions. The electromagnetic waves with corresponding wavelengths are called near-infrared, mid-infrared and far-infrared. Infrared is a type of light wave that has a shorter wavelength than radio waves and longer than visible light. The infrared is invisible to the naked eye, and any object emits infrared. Infrared radiation from hot objects is stronger than cold objects.

There are countless sources of far-infrared radiation in nature: cosmic stars, the sun; oceans, mountains, rocks, soil, forests, cities, villages, and various items produced by humans on earth, all at absolute zero (-273.15 ) The above environment emits various degrees of infrared light everywhere. Modern physics calls it heat rays. by

According to the requirements of users, the infrared division range is very different.

Divide the three bands that can pass through the atmosphere into:

Near infrared band 1 ~ 3 microns

Mid-infrared band 3 5 microns

Far infrared band 8 14 microns

Divided into:

Near infrared band 1 ~ 3 microns

Mid-infrared band 3 40 microns

Far infrared band 40 1000 microns

This is often divided in the medical field:

Near-infrared region 0.76 to 3 microns

Mid-infrared region 3 30 microns

Far infrared region 30 1000 microns

Near-infrared or short-wave infrared, with a wavelength of 0.76 to 1.5 microns, penetrates deep into human tissues, about 5-10 mm; far-infrared, or long-wave infrared, with a wavelength of 1.5 to 400 microns, is mostly absorbed by the skin and penetrates the tissue to a depth less than 2 mm. (But in practice, infrared rays above 2.5 microns are commonly referred to as far-infrared rays ^[4] .)