The laser is a powerful and very damagingsubstance to the eye. Nowadays the emergence of laser protective goggles isalso emerge in endlessly, how to choose a good laser protective goggles, thecorrect use of laser protective goggles do you have some understanding? Let'stake a closer look at the following information.
1, the use of laser protective glasses Asthe laser technology is widely used in the field of military, civilian, laserprotection technology more and more get people's attention, the kinds of laserprotective materials are increasing. From the principle of protection, laserprotection materials can be classified into three types:
Oneis laser protection based on linear optics, which includes absorption,reflection and absorption/reflection complex.
Laser protection, the second is based onthe principle of nonlinear optics is its main use of the third order nonlinearoptical effects, including nonlinear absorption and nonlinear refraction andnonlinear scattering and nonlinear reflection;
The third is laser protection based on theprinciple of phase change. The laser has the characteristics of directional,monochromatic and coherent, which makes it widely used in military, industrialand medical fields. But it is these characteristics of the laser that pose agreat threat to the human body. Eyes are most sensitive to the laser organs,due to the effect of focus of the eye to light can make the retina of 105 timesmore energy density, so low dose irradiation of laser directional strong, goodmonochromaticity, coherence is good wait for a characteristic, make it in themilitary, industrial and medical and other fields have a wide range ofapplications.
But it is these characteristics of thelaser that pose a great threat to the human body. Eyes are most sensitive tothe laser organs, due to the effect of focus of the eye to light can make theretina of 105 times more energy density, so low doses of radiation can causeserious retinal damage and lead to decreased vision and blindness. How to makeeffective laser protection can cause severe damage to the retina and lead tovision loss until blindness. Absorption, reflection-type laser protectionmirror and a poor reflector laser lens are coated with multiple layers ofreflective media on the surface of the base optics glass.
Advantages:
The process is simple;
High visible light.
Higher attenuation rates;
The light response time is 10 to 9 seconds.
Disadvantages:
There is a serious selection of lightsources. The incoming light source must be opposite the protective mirror (inthe direction of the lens of the photoscope), the protection is the maximum,the less the least;
2, reflecting medium layer is easy to takeoff, and fall off after not easy macroscopic observation, it is also one of themost dangerous, a reflection of domestic medium layer loss can occur in a yearor so. The higher the light attenuation rate, the thicker the dielectric layer,the easier to fall off. Absorption goggles are added to the base material PMMAor P.C.
Advantages:
1, there is no selective light source,which is safe to protect all kinds of diffuse reflection.
The rate of decay is higher;
The surface is not afraid of wear andtear, even if there is friction, it does not affect the safety of light.
Light reactions are 10 to 9 secondsfaster;
Disadvantages: low visible light. Now useabout laser safety in our country compulsive standard has: CJB - 2408-95 laserprotective glasses protective performance test methods GJB - 1762-93 laserprotective glasses physiological health protection requirements JB/T5524-91laser laboratory safety rules There are different types of laser protective goggles,different materials, different principle and applications are also different.Therefore, to provide effective protection against laser, it is necessary tomake reasonable selection of laser goggles according to the specific userequirement. Choosing goggles, first of all, according to the maximum outputpower of the laser used (or energy), beam diameter, pulse time determineparameters such as laser output maximum irradiance or maximum exposure. Then,according to the corresponding wavelength and irradiation time of the maximumallowable exposure exposure limit (eye) determine minimum optical density valuefor the glasses, and on the basis of selecting appropriate protective goggles.
The specific conditions of choice are:
Maximum irradiation dose of Hmax (J/m2) ormaximum irradiance Emax (W/m2);
Specific protective wavelengths;
Minimum optical density value of Dmin atthe corresponding protection wavelength;
The non-uniformity, asymmetry and Angleeffect of the protective lens, etc.
The ability to resist laser radiation;
6, visible light transmittance;
Structure and shape.
Precautions for laser goggles:
Laser safety glasses can also be used forlaser light.
2, whether the laser damage threshold ofthe lens (because of various machine power) laser protective glasses use timeis about: 700 ~ 900 hours, it is recommended to use three months after thereplacement.
The laser safety goggles are made of highpolymer materials, and the surface is strictly forbidden for hard material andgrinding. Clean the lens with neutral detergent and clean water, then wipe withthe mirror cloth.
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