1 Definition
polarized, English name polarized light
interpretation: also known as polarized light. Visible light is a transverse wave whose vibration direction is perpendicular to the propagation direction. The vibration direction of natural light is arbitrary in the plane of Vertical propagation direction; For polarized light, its vibration direction is limited to a specific direction at a certain moment.
2 Functions
in life, too many light sources will produce harmful light, especially sunlight; The light emitted from the sunlight includes: visual light, infrared, ultraviolet Ray(Ultraviolet) and other three types. When ultraviolet rays cause serious damage to human skin, eyes, etc.; Too much, visual light (Visible light ray)(310 ~ 780nm); Ultraviolet rays are divided into UVA, UVB, UVC(310nm) or above, among which UVA, UVB and UVC are harmful light. If exposure for a long time will cause damage to the body, UVB has a serious impact on vision,(Tanning Ray) is the light that burns dark skin. Most corners of the eyes absorb this kind of UVB light, so you must shield against this kind of light source. Polarized sunglasses have the function of polarizing light, so they can block all harmful light without affecting the penetration of visible light, thus truly achieving the function of protecting eyes. In addition to the basic UV protection function, polarized sunglasses also have anti-glare, road reflection light, water surface scale light, etc. They are suitable for driving, fishing, traveling and daily wear.
3 Manufacturing principle
polarized sunglasses can block uncomfortable strong light and protect your eyes from ultraviolet rays. All this is attributed to the metal powder filtering device, which can "select" the light when it enters ". Polarized sunglasses can selectively absorb part of the band that forms the sun's rays, because it relies on very fine metal powder ( iron, copper, nickel etc.). In fact, when the light shines on the lens, the light is reduced based on the so-called "cancellation interference" process. That is to say, when some wavelengths of light (here refers to ultraviolet a, ultraviolet B, and sometimes infrared) when passing through the lens, they will offset each other in the direction of the inner side of the lens towards the eye. It is not accidental to form the overlap of light waves: the peak of a wave is combined with the trough of the wave close to it, which leads to mutual cancellation. Cancellation interference phenomenon depends on the lens sp ref(That is, the degree of deviation when light passes through different substances from the air) also depends on the lens thickness. Generally speaking, the thickness of the lens does not change much, while SP ref of the lens varies according to the difference of chemical composition.
Polarized sunglasses provide another mechanism to protect eyes. Asphalt Road the reflected light is a special polarized light. The difference between this reflected light and light directly from the Sun or any artificial light source lies in point of order. Polarized light is formed by waves that vibrate in one direction, while ordinary light is formed by waves that vibrate in the non-directional direction. This is like a group of people walking around without order and a group of soldiers marching at neat steps, forming a distinct scripture. Generally speaking, reflected light is an orderly light. Polarized lenses are particularly effective in blocking this kind of light because of its filterability. This kind of lens only allows the polarization wave vibrating in a certain direction to pass through, just like "combing" the light. For road reflection problems,
the use of polarized sunglasses can reduce the transmission of light because it does not allow light waves that vibrate parallel to the road to pass through. In fact, filter bed long molecules are directed horizontally and can absorb horizontally polarized light. In this way, most of the reflected light is eliminated, while the whole illumination of the surrounding environment is not reduced.
Finally, the lens of polarized sunglasses can be dimmed after the sun shines. When the lighting weakens, it becomes bright again. The reason why this is possible is that silver halide the crystal is at work. Under normal circumstances, it can keep the lens perfectly transparent. Under the irradiation of sunlight, the silver in the crystal is separated, and the free silver forms a small aggregate inside the lens. These small silver aggregates are irregular blocks with interlaced teeth. They cannot transmit light, but can only absorb light. As a result, the lenses are dimmed. In the case of light and darkness, crystalline it reforms again, and the lens returns to a bright state.
4 Identification UV (UV protection degree)
UV the standard meaning refers to: the human eye's perception range of light is 380 ~ 780nm (that is, visible light), and ultraviolet light refers to light with a wavelength lower than 380nm (invisible light). UV380 means that it can effectively block light with wavelength below 380nm. The UV400 standard also blocks some visible light, so it will lose some color. Polarization (polarized light, polarized filter)
color saturation, which makes the outline of the object blurred and makes the eyes tired and uncomfortable. Polarizer is made according to the polarization principle of light, that is, when the vibration plane of light is parallel to the polarization axis, the polarized light filter can make polarized light transparent (just like the principle of shutter). Therefore, the light is sorted into the same direction light into the human eye, making the surrounding scenery look clear without dazzling. In addition, another outstanding advantage is that the film is extremely light, thin (thickness 0.8mm, 1.1mm mm) and impact resistant, so this kind of lens is very suitable for driving and outdoor activities, and has been favored by the majority in recent years.
Drivers prefer to wear polarized sunglasses, because reflective lenses can block ultraviolet Ray in addition, it can greatly reduce and filter out the reflected glare. For example, when driving, the accent light of the opposite car or the strong glare caused by the window stickers reflection blocking UV window film of the car driving in front is exposed to the Sun, so that the wearer can clearly see the things in front.
5 Differences
generally, the sun glasses only uses the effect of light reduction. Because ordinary lenses cannot filter light, they can only reduce the intensity of glare, ultraviolet light, etc. and cannot completely block these harmful light, therefore, its function is only to reduce eye damage, but the general advantage of sun glasses is good popularity. Polarized lenses have polarized properties, so they can completely block glare caused by various factors such as scattering, bending, reflection, etc. At the same time, it can completely block the ultraviolet light harmful to human eyes, making people not tired when they move for a long time under strong light, achieving the function of real protection, and making the things seen clearer, three-dimensional.
6 Classification
polarized sunglasses can be divided: ski goggles, fishing glasses, polarized driving glasses, outdoor sports glasses, golf glasses.
Polarized sunglasses can be divided into: Polarized sunglasses made of glass, polarized sunglasses made of resin and polarized sunglasses made of TAC lens.
7 Applications
in summer, fishing pal like to wear polarized glasses. Why? The reason is very simple. Polarized sunglasses can filter polarized light. Wearing them for fishing makes it easier to float and the eyes are not tired. If the lenses are dark colors (such as brown, green Gray, etc.), it is used to wear in summer and feels more comfortable.
Polarized lenses are globally recognized as suitable for driving. When light is reflected from the surface of an object, it has been partially polarized to generate glare. The opposite effect of glare-enhance brightness and weaken color saturation; Make the outline of the object blurred, and make glasses tired and uncomfortable. Polarizer is made according to the polarization principle of light, with the special function of effectively eliminating glare, filtering the chaotic light, making drivers improve their vision and increase driving pleasure.
Friends who like outdoor leisure travel are also keen on reflective lenses pieces. Reflective lenses is composed of a balanced crystal, which only allows light waves balanced with the crystal to pass through, all light waves that vibrate to other angles are blocked. If you adjust the angle of reflective lenses, the polarized light reflected by water surface, glass, flowers and plants, water and gas can be blocked, and the normal light can be partially passed, thus strengthening the contrast, reduce reflection, enhance the color of scenery, reduce the effect of atmospheric fog phenomenon, let you see the world clearly, also you a colorful world, bluer sky, rich and beautiful nature.
The polarization angle and radian of the lens are professionally designed and processed, so the wearers will not feel the distortion and vertigo of the scene. Resin polarized lenses have the advantages of lightness and not easy to be broken, and they are easy and comfortable to wear. Suitable for fishing, driving, sports, sailing, skiing, hunting and other occasions.
