Since the COVID-19 war, infrared thermal imaging cameras have been on fire. This non-contact rapid human body temperature measurement technology has become a powerful tool for identifying suspicious fever persons in densely populated places such as transportation hubs, shopping malls, and factories for epidemic prevention and investigation.

What is infrared thermal imaging? Before understanding this technology, we should first know what infrared is.

Infrared can be said to be a kind of light that you can’t see. It is an electromagnetic wave with a wavelength between 0.76μm and 1mm. Together with visible light, ultraviolet rays, X-rays, gamma rays, cosmic rays and radio waves, it forms a complete Continuous electromagnetic spectrum

What objects radiate infrared rays?

Simply put, any object with a temperature greater than absolute zero (-273°C) can radiate infrared rays. Absolute zero is an existence that can only be approached infinitely and cannot be reached. The higher the temperature, the stronger the infrared radiation.

Infrared thermal imaging is to focus the infrared radiated by the object on the infrared detector array through the optical system, and then the detector converts the radiation signal of varying intensity into the corresponding electrical signal, and then through the amplification and video processing, it can be formed for the naked eye. Observed video image. To put it simply, it is a special digital camera, except that the general digital camera takes visible light, while the infrared camera takes infrared light and converts it into a "thermal" image that you can see