What is the difference between the 940nm and 1400nm infrared bands of the solar film transmission meter?

We all know that infrared rays in sunlight are the main source of heat. But do you know? Infrared rays are actually divided into two camps: "near infrared" and "mid- and far-infrared": Today we will talk about the difference between the infrared 940 and 1400nm bands of solar film transmisssion meter?

Different penetration ability

940nm near infrared: Like an "invisible arsonist", it can penetrate ordinary glass and directly heat the air and surface of objects in the car. It is the main cause of the "greenhouse effect", but its characteristic is weak penetration and is easily absorbed by ceramic films, so we measure it.

1400nm mid- and far-infrared: Like a "deep penetrator", it is good at penetrating the skin directly to the dermis, making it easier for people to feel hot. Long-term exposure may accelerate skin aging, so its strong penetration ability is its characteristic.

But in real scenes, the solar spectrum is a mixed attack of 940nm and 1400nm, and a single band test is like a blind man touching an elephant. It is difficult to tell whether a product is good or bad, so if we want to understand its heat insulation performance more realistically, 

we recommend choosing an instrument like the Guoou Guoou S1PROMAX solar film tester, which has dual bands of 940 and 1400nm. In addition, if the full infrared band can be used through the algorithm, it is also a good data reference.

Through the band of the solar film tester, the consumption trap is closed

Let's take high-quality solar film as an example

940nm band heat absorption efficiency>80% (resist direct sunlight)

1400nm band reflectivity>70% (intercept secondary radiation of metal objects)

Summary

Infrared 940nm and 1400nm, these two seemingly small numerical differences are actually a microcosm of the deep combination of technology and life needs. Just like the research and development concept of the Guoou tester: 

"Use the language of light to decode the secret of heat"-in the pursuit of comfort and energy saving, science has never stopped exploring. Next time you choose a solar film, you might as well ask the boss one more question: 

What band is used to test the infrared blocking rate of your solar film transmission meter?