0010010 nbsp; 0010010 nbsp; 0010010 nbsp; When people observe the tempered glass at a certain distance and angle under certain lighting conditions, they will see some Very regular colored spots, this kind of colored spots is what we usually call "stress spots", although the presence of stress spots does not affect the reflection effect of the glass (no reflection distortion), nor does it affect the transmission effect of the glass (It will not affect the resolution and will not cause optical distortion). 0010010 nbsp;

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; It is an optical characteristic that all tempered glass has, not a quality problem or quality defect of tempered glass, but tempered glass is used as a safety glass More and more widely, people have higher and higher requirements on the appearance of glass, especially when applied as a large-area curtain wallTempered glassThe presence of stress spots will adversely affect the appearance of the glass, and even affect the overall aesthetic effect of the building, so people pay more and more attention to stress spots.

　　1 The causes of stress spots

All transparent materials can be divided into isotropic materials and anisotropic materials. When the light passes through the isotropic material, the speed of the light is the same in all directions, the outgoing light and the incident light do not change, and the well annealed glass belongs to the isotropic material.

0010010 nbsp; 0010010 nbsp; 0010010 nbsp; As an anisotropic material of tempered glass, the phenomenon of stress spots can be explained by the photoelastic principle: when a beam of polarized light passes through tempering Due to the stress (tempering stress) inside the glass, this beam of light will be decomposed into two polarized lights with different propagation speeds, fast light and slow light, also known as birefringence. When the two beams formed at a certain point intersect with the beam formed at another point, there is a phase difference at the intersection of the beams due to the difference in light propagation speed. At this point, the two beams will interfere. When the two beams When the amplitude direction is the same, the light intensity is strengthened, resulting in a bright field of view, that is, bright spots; when the direction of light amplitude is opposite, the light intensity is weakened, resulting in a dark field of view, that is, dark spots. As long as there is uneven stress distribution in the plane direction of the tempered glass, stress spots will occur.

In addition, the reflection effect of the glass surface causes a certain polarization effect in both reflected light and transmission. The light entering the glass is actually light with a polarization effect, which is why light and dark stripes or markings are seen.