Goggles have different functions in different categories in life and work. Let us take a look.
Absorption
Absorption filters use lenses to absorb certain wavelengths of light to reduce the intensity of light entering the eyes.
Sun glasses
Also known as sunglasses, the transmittance of visible light is about 20%, and the absorption of ultraviolet and infrared is good. There are light green, light gray, light tea and other colors, used to make sun-shading and snow work protective glasses. Among them, light gray lenses have the least effect on color recognition; light tea glasses make the blue sky look darker and reduce the transmission of green light; light green lenses reduce the transmission of red light.
Goggles for gas welding
The colorants used in this lens are mainly iron oxide, cobalt oxide, etc., which are yellow-green in color and can absorb all light waves with wavelengths below 500 urn. The visible light transmittance is below 1%, and only a small amount of infrared rays can pass through. This kind of glasses is specially used for welding in gas welding operation.
Goggles for welding
Ultraviolet rays generated by electric welding can cause damage to the cornea and conjunctival tissues (28nm light is the most serious) when irradiated to the eyeball for a short time. The strong infrared rays produced can easily cause opacity of the eye lens. Welding goggles can block the above infrared and ultraviolet rays very well. This kind of lens is based on optical glass and uses coloring agents such as iron oxide, cobalt oxide and chromium oxide. In addition, a certain amount of cerium oxide is added to increase the absorption of ultraviolet rays. The appearance is green or yellow-green. It can block all ultraviolet rays, the infrared transmittance is less than 5%, and the visible light transmittance is about 0.1%.
Blue goggles
There are two kinds of this kind of glasses, one is colored iron oxide and cobalt oxide, and the filament is purple red with it, and the other is colored with copper oxide and manganese oxide, and the filament is white with it. They can all absorb the dazzling glare in the 500-600nm (visible light sensitive area of the human eye), the light transmittance at 400nm is below 12%, and it also has a certain absorption effect on ultraviolet rays. It is suitable for various industrial high-temperature furnaces. Personnel wear.
Crimson glass glasses "This kind of spectacle lens is a kind of dark red glass colored with cadmium sulfide and cadmium sulphide selenide, which can absorb all the light in the wavelength band below 600nm. It can be used as goggles for medical or industrial personnel operating X-ray fluoroscopy equipment.
Laser protective glasses
There are two forms of this kind of glasses, namely reflective and absorptive. The surface of the former adopts a vacuum coating method to coat a layer of metal film, and the reflectivity of the laser bands with wavelengths of 532nm, 694nm and 1060nm is greater than 99.5%; the latter lens It can absorb all the 1060nm laser wave band. The lens must be equipped with a closed or semi-closed frame to prevent the laser from bypassing the lens and entering the eye. It can be used as protective glasses for laser operators.
Microwave protective glasses
Microwave is an electromagnetic wave with a wavelength of about 1nm-1M. It can also cause harm to people, especially eyes.
Under the action of strong microwaves, it can cause eye fatigue, dry eyes and dizziness, and can even cause lens opacity, cataracts and retinal damage. It is protected by spraying tin tetrachloride on the surface of the lens and a metal compound that can increase conductivity, forming a multilayer conductive film on the surface of the lens, which plays a role in shielding microwaves. Because the microwave can bypass the lens and enter the eye, the frame of the lens should also be shielded to prevent the damage to the eye caused by the microwave.
