After people buy a car, the first thing usually is to stick the car film. The benefits of the film to the car are obvious. According to the summary, the main purpose of the film is sun protection (ultraviolet), heat insulation (infrared), explosion and protect privacy. However, some unqualified window film will affect the light transmittance of the window. When the light transmittance of the window film does not reach the corresponding standard, the reflection caused by the film will cause the opposite vehicle to see the road condition, which is easy to occur traffic accident. At the same time, the low light transmittance will directly affect the driver's line of sight clarity, misjudge the driving conditions of the vehicle and affect driving safety. In order to check whether the light transmittance after the film conforms to the standard, we need to use light transmittance meter.
Among the several main functions of the film, first of all, the glass itself has a strong anti-ultraviolet effect. Secondly, the heated infrared can easily penetrate the film and it is little affected by the car film. Explosion protection is mainly for protection against some natural disasters. In addition, the car glass itself has explosion-proof features and does not require film explosion protection. Such situations are also less likely to occur. In fact, in the process of filming, the owner's main consideration is to protect privacy. Therefore, when choosing a film, a darker color film is also preferred. However, a darker color film may cause the light transmittance to be too low. The quality is uneven and the light transmission is also varied. The light transmittance meter can be used to detect the light transmittance of automotive film.
The light transmittance test results of the light transmittance meter can effectively distinguish the quality of the car film. National motor vehicle use regulations stipulate that the light transmittance of the front windshield of the car and the viewing area of the driver on both sides of the rear-view mirror cannot be less than 70%. The transmittance of the front windshield itself is generally 75%. According to the optical principle, the light transmittance of a glass film is the light transmittance of the film times the light transmittance of the glass. In this way, once the inferior film is selected, the light transmittance of the window can easily fall short. Therefore, the application of the light transmittance meter to automotive film can promptly eliminate car films that do not meet the standard in the production process.
At the same time, from an optical point of view, you can also use a light transmittance meter to judge the quality of a car film. According to the test results, reference is made from three aspects: light transmittance, heat insulation rate and ultraviolet rejection rate. Using a window film transmission meter and a light transmittance meter , UV transmittance, visible light transmittance and total sunlight shielding can be detected.
The traffic police also uses a light transmittance meter to detect the light transmittance of the car film. Generally speaking, the internal reflectance of automotive films should also be kept low. The metal film has a higher light reflectance and the light transmittance is usually above 15%. This is because the metal has high gloss and strong reflectivity. When the light transmittance is too low, the driver's vision is blocked. It is impossible to predict the situation in front. The blind zone is easy to cause visual fatigue and it is impossible to respond in time when a traffic accident occurs. Therefore, when choosing a car film, it is necessary to use a light transmittance meter to select a car film of a proper specification.
Judging from the appearance, the inferior film or the car film with too low light transmittance will have a gray feeling and even cause the deformation of the contour of the film. After using for a long time, bubbles will be generated, which will affect the appearance of the car. Conversely, high-end car films and car films that meet the light transmittance test have a very high definition regardless of the angle from which they are not easily scratched. However, for some car films that are difficult to distinguish from the outside, it is still difficult to distinguish between true and false. We can use a light transmittance meter to test whether the film meets standard specifications.