Infrared ray is a kind of electromagnetic wave, and its wavelength range is 0.76 ~ 1000 micron. Usually, infrared ray is divided into two parts, and the wavelength is less than 5.6 micron, and the one close to red light is called near infrared ray. Wavelength greater than 5.6μm, far away from red light is called far infrared ray. Near infrared and far infrared are relative. Some people divide infrared into near infrared, middle infrared and far infrared. Near infrared ray with wavelength of 1-3μm; The wavelength of 2 ~ 40 microns is called mid-infrared; The wavelength of 40 ~ 1000 micron is called far infrared ray.
Extended data:
Safety of infrared radiation:
Non-ionizing radiation is safer than sunlight.
Low-frequency rays such as infrared rays, microwaves, radio waves and wireless long waves all belong to non-ionizing radiation. Unlike ionizing radiation, the energy of the particles that make up them (that is, the particles that make up them) is not enough to break the chemical bonds of molecules and will not cause ionization of atoms or molecules. The energy of radiation component particles depends only on the frequency of electromagnetic waves. If the frequency is insufficient, no matter how high the radiation intensity is, it will not cause ionization.
From the comparison table of wavelength and frequency of electromagnetic waves, we can see that the frequency of visible light emitted by human eyes is about 10 15 Hz, while the frequency of mobile phones and TV radars is about 109 Hz.
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