lasersafetyatfermilab-免費(fèi)閱讀
【正文】 scattered radiations Reflections ? Specular – Mirrorlike – Irregularities l “Smooth” – Angle incidence = Angle reflection ? Diffuse – Fuzzy – Irregularities l “Rough” – Max reflected normal to surface Different kinds of “l(fā)aser people” ? Laser operators – People who operate laser systems that emit harmful levels of laser radiation. ? Spectators – People whose access to potentially harmful levels of laser radiation is controlled by the laser operator. More roles ? The Public – People who must be isolated from potentially harmful levels of laser radiation because the laser operator cannot control their access. Lasers by hazard class Class 1 ? Description – Any wavelength (meaning to 103 mm) – Over 8 hrs of direct eye exposure to cause injury – 40 to 400 mW for visible CW lasers ? Precautions – Usually none – But watch out for the following ? Disassembly if enclosed laser has higher hazard class ? Modifications that may increase the hazard class Class 2 description ? Visible wavelength beam ( to mm) ? Over sec to cause eye injury ? Up to 1 mW CW ? Depends on aversion response Class 2 precautions ? Do not stare into the beam ? Do not point the beam at people or shiny objects ? Maintain separations for public displays ? Precautions for Class 1 lasers apply Class 3a description ? 1X to 5X Class 2 limits for visible radiations – to mm – Up to 5 mW as long as mW/cm2 ? 1X to 5X Class 1 limits for invisible radiations – UV ( mm) – IR ( mm) Class 3a precautions ? Do not view the beam directly with optical instruments ? Precautions for Class 1 and 2 lasers apply Class 3b description ? More than Class 3a but less than W ? “Immediate” eye hazard – UV: less than hours – VIS: less th
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