First, absorption filter
1, sunshade glasses, also known as sunglasses, visible light penetration rate of about 20%, the absorption of ultraviolet and infrared light is better. There are light green, light gray, light tea and other colors, used to make sun and snow work protective glasses. Light gray lenses have the least effect on color recognition, light tea glasses make the blue sky look darker, reducing green light through, and light green lenses reducing red light through.
2, gas welding eyeglasses This lens is mainly used for iron oxide, cobalt oxide, etc. , yellow-green, can absorb all the wavelengths below 500urn light waves, visible light penetration rate of less than 1%, only a small amount of infrared through. This pair of glasses is intended for use in gas welding operations.
3, welding eyeglasses electro-welding produced ultraviolet rays, short-term exposure to the eyeball will cause damage to the cornea and conjunctiva tissue (with 28nm light the most serious). The resulting strong infrared light can easily cause cloudy eye crystals. Welding goggles can be very good at intercepting the above infrared and ultraviolet light. The lenses are based on optical glass, using iron oxide, cobalt oxide and chromium oxide, plus a certain amount of zirconia to increase the absorption of ultraviolet light. The appearance is green or yellow-green. Can completely intercept ultraviolet light, infrared penetration rate <5%, visible light penetration rate of about 0. 1％。
4, blue eyeglasses There are two kinds of glasses, one for iron oxide and cobalt oxide coloring, with it to see the filament for fuchsia, the other is to copper oxide, manganese oxide coloring, with it to see the filament for white. They can all absorb 500-600nm (human eye visible light sensitive area) band of dazzling glare, at 400nm at the light penetration rate of less than 12%, UV rays also have a certain absorption effect, suitable for a variety of industrial high-temperature furnace operators wearing.
5, crimson glasses This spectacle lens is a dark red glass colored with cadmium sulfide and cadmium sulfide, which absorbs all the light in bands below 600nm. Can be used as a goggles for medical or industrial personnel operating X-ray equipment.
6, laser protective glasses There are two forms of glasses, namely, reflective and absorbent, the former surface using vacuum coating method coated with a metal film, the wavelength of 532nm, 694nm and 1060nm laser band reflectivity is greater than 99. 5%; The latter lens absorbs all of the 1060nm laser band. Lenses must be fitted with a closed or semi-enclosed frame to prevent lasers from penetrating the lens into the eye. Can be used as protective glasses for laser operators.
7, microwave protective glasses Microwave is a wavelength of about 1nm-lM electromagnetic waves, it can also cause harm to people, especially the eyes. Under the strong microwave action, can cause eye fatigue, dry eyes and dizziness, and can even lead to crystal turbidity, cataracts and retinal damage. Its protection is the use of lens surface sprayed with tin tetrachloride and can improve the conductivity of metal compounds, in the lens surface to form a multi-layer conductive film, played a role in shielding microwaves. Because microwaves can bypass the lens into the eye, the frame should also be shielded to prevent microwave damage to the eyes.
Second, reflective filter
absorption filter, is the use of lenses to absorb certain wavelengths of light, to reduce the intensity of light into the eye, but because the lens absorbs some light, into heat release, especially infrared and some other wave longer light, due to the accumulation of heat, so that the eyes feel very uncomfortable. If the reflection filter is used, this problem can be solved well. In the front coated glasses have been introduced, if the lens surface is coated with a higher refractive index than the lens itself, the material film layer, will increase the reflection of light, reduce the intensity of light through the light, so as to protect the eye from bright light and harmful rays. In real working life, many cases are absorbent and reflective joint use, that is, on the colored lenses to coat a layer of high-reflective film, so that the filter effect is stronger, such as welding, chlorine arc welding, plasma cutting and other operators wear glasses, you can use this method to solve.