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Two different protection theories for protective glasses

by:LASERRPAIR     2020-02-16
As one of the protective equipment that guarantees our life and health, protective glasses are an indispensable part of our daily life, because of its convenient characteristics, it has become one of the most widely used protective equipment. In order to let everyone better understand the protective glasses, I will introduce you from the aspect of protection. First, the reflective filter ? ??Absorptive filters use lenses to absorb certain wavelengths of light to reduce the intensity of light entering the eyes, but because the lenses absorb some light, they become heat, especially infrared rays and other waves with longer wavelengths. The light, due to the accumulation of heat, makes the eyes feel uncomfortable. If a reflection filter is used, this problem can be solved well. It has been introduced in the front-coated glasses that if a layer of material with a higher refractive index than the lens itself is coated on the surface of the lens, it will increase the reflection of light and reduce the intensity of transmitted light, which can protect it. Eyes are not harmed by strong light and harmful rays. In actual working life, in many cases, absorption and reflection are used in combination, that is, a highly reflective film is plated on colored lenses to make the filtering effect stronger. For example, operators such as electric welding, chlorine arc welding, plasma cutting, etc. Wearing glasses can be solved by this method. ? Second, the absorption filter ? ??1. Sunshade glasses Also known as sunglasses, the visible light transmittance is about 20%, and it has better absorption of ultraviolet and infrared rays. There are many colors such as light green, light gray, light tea, etc., which are used to make sun protection and snow work protective glasses. Among them, light gray lenses have the least impact on color recognition; light tea glasses make the blue sky look darker and reduce green light transmission; light green lenses reduce red light transmission. ? ??2. Gas welding goggles The coloring agent used in this lens is mainly iron oxide, cobalt oxide, etc., which is yellow-green, can absorb light waves with a wavelength of less than 500urn, the visible light transmittance is less than 1%, and only a small amount of infrared by. These glasses are intended for use during gas welding operations. ? ??3. Goggles for electric welding Ultraviolet rays generated by electric welding will cause damage to the cornea and conjunctival tissue of the eyeball for a short time (28nm light is the most serious). The intense infrared light generated can easily cause cloudiness of the eye lens. Welding goggles can block the above infrared and ultraviolet rays well. This lens is based on optical glass and uses coloring agents such as iron oxide, cobalt oxide, and chromium oxide, and a certain amount of cerium oxide is added to increase the absorption of ultraviolet light. Appearance is green or yellow-green. Can block all ultraviolet rays, infrared transmittance <5%, visible light transmittance is about 0.1%. ? ??4, blue goggles There are two kinds of these glasses, one is coloring iron oxide and cobalt oxide, use it to see the filament is purple, the other is coloring copper oxide, manganese oxide, use it to see the filament is white . They can all absorb dazzling glare in the 500-600nm (visible area sensitive to human eyes) band, and the light transmittance at 400nm is less than 12%. They also have a certain absorption effect on ultraviolet rays, and are suitable for various industrial high-temperature furnaces. Worn by personnel. ? ??5. Crimson glass glasses This spectacle lens is a dark red glass colored with cadmium sulfide and cadmium sulfenide, which can absorb all light with a wavelength below 600nm. Can be used as goggles for medical or industrial personnel when operating X-ray fluoroscopy equipment. ? ??6. Laser protective glasses. There are two types of these glasses, namely reflection type and absorption type. The former uses a vacuum coating method to coat a metal film. The reflectivity of laser bands with wavelengths of 532nm, 694nm, and 1060nm is greater than 99.5%. The latter lens can absorb all of the 1060nm laser band. The lens must be equipped with a closed or semi-closed frame to prevent laser light from entering the eye around the lens. Can be used as protective glasses for laser operators. ? ??7. Microwave protective glasses Microwave is an electromagnetic wave with a wavelength of about 1nm-lM. It can also cause harm to people, especially eyes. Under the action of strong microwave, it can cause eye fatigue, dry eyes and dizziness, and even cause cloudiness, cataract and retinal damage. Its protection is to spray tin tetrachloride on the lens surface and metal compounds that can increase the conductivity, and to form a multilayer conductive film on the lens surface, which plays a role in shielding microwaves. Because the microwave can bypass the lens and enter the eye, the frame should also be shielded to prevent microwave damage to the eye.
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