1. Traditional cognition
For transparent or translucent materials, most people have the idea that the higher the light transmittance and the lower the haze, is there a corresponding inverse relationship between the two?
Sadly, this idea is Absolutely wrong!
2. Objective facts
The relationship between light transmittance and haze seems to be chaotic, but I will be very responsive to say that there is no relationship between the two, and it is also based on objective facts.
why?
2.1. Light transmittance
Light transmittance characterizes the light transmittance of transparent and semi-transparent materials. The main factor affecting the light transmittance is the material's reflection or absorption of light in different wavelength bands. The greater the reflection or absorption, the smaller the light transmittance.
Transmittance value Tt=(transmitted light flux/incident light flux)*100%
The transmittance is easy to understand and will not be repeated.
2.2, haze
The haze characterizes the irregular state of turbidity of transparent and translucent materials. The main factors affecting the haze are the internal structural defects of the material, the introduction of external impurities, and the surface friction and wear.
*Internal structural defects, the introduction of external impurities, surface friction and wear, and other factors exist so that the total transmitted luminous flux obviously presents two parts of parallel transmitted luminous flux Tp and scattered luminous flux Td;
*The parallel transmitted luminous flux Tp is on a straight line with the incident light, strictly speaking, the luminous flux within the half-angle range of 2.5°, and the range beyond the half-angle 2.5° is called astigmatic transmitted light flux Td;
*The more obvious factors such as internal structural defects, the introduction of external impurities, surface friction and wear, etc., the greater the value of the scattered transmitted light flux Td, the greater the haze value.
Haze value Haze=(scattered transmitted luminous flux/total transmitted luminous flux)*100%
Or, Haze=(Td/Tt)*100%
Some people here will say that the higher the light transmittance of Tt, that is, the larger the denominator, the lower the haze value. I would like to remind you in good faith, don't ignore the important role of the diffuse transmission Td!
2.3. Numerical example of transmittance haze
*The incident luminous flux is 100 units, the total transmitted luminous flux is 90 units, and the transmittance is 90%
Scatter transmission 10 units, parallel transmission 80 units, haze value 10/90=11.1 (%) -- high transmission and low haze
Scatter transmission 80 units, parallel transmission 10 units, haze value 80/90=88.9 (%)--high transmittance and high haze
*The incident luminous flux is 100 units, the total transmitted luminous flux is 20 units, and the transmittance is 20%
Scatter transmission 2 units, parallel transmission 18 units, haze value 2/20=10 (%)--low transmission and low haze
Scatter transmission 18 units, parallel transmission 2 units, haze value 18/20=90 (%) -- low transmission and high haze
Haze has nothing to do with transmittance!
In summary, haze and transmittance have nothing to do!
The haze and transmittance are measured with a transmittance haze meter. GBPI provides optimized haze transmittance solutions, professional assistance, and common progress!
