lasersafetyatfermilab-資料下載頁(yè)
2025-10-03 15:34本頁(yè)面
【導(dǎo)讀】Blastfromthepast!–10/17/2020. aplexproblem?Intensity/Duration. Wavelength. Modulation. Partofbodyexposed. Bodycovers. DOE. unwantedexposures.lacking.exposure.Eyeexposure. Alignment. Immediatecauses. Standardstartsatmm. FarIRto103mm. UV-Cornea+lens. VIS-Retina. IR-Cornea. Thermal. Photochemical. Photoacoustic. Plasmagenic. Low@Class1,2&3a=>fewrequirements. High@Class3b&4=>manyrequirements. Class3band4systems–mostlyphysicsapps. Class2and3asystems–oftendiodelasers
【正文】 a lighttight room with only qualified allowed inside ? Weak – Unqualified people kept away from open laser beam(s) in a way that relies heavily on mon sense and trust (., safety tape) Isolation: box or room Goal: Reduce hazard class ? Usually aim to drop Class 3b/4 to Class 1 ? Enclose as much of beam path as possible ? Fiber optics can be part of enclosure ? “Good enough” radiation tightness OK ? Enclosure must be locked or interlocked ? Added benefit: protects your laser setup To lock or interlock? ? Locked enclosure (typical for box) – “Tool” required to open enclosure (can be a key) – Warning message also required ? Label(s) on box ? Sign(s) on room door(s) – Objective: opening enclosure must be deliberate act ? Interlocked enclosure (typical for room) – Opening enclosure turns off beam CDF laser box locked CDF laser box open Signs ? Remended designs ? Post where they will best warn potentiallyexposed people (., doors) ? Avoid longterm posting – People will learn to ignore warning – Mags, velcro, illumination Signs amp。 labels A0 laser room entrance Laser eye protection ? Dl = optical density @ wavelength l ? Hp = potential eye exposure ? MPE = Maximum Permissible Exposure Dl = log10(Hp/MPE) Get help from LSO, online applications, and eyewear distributors. Estimated exposure duration Wavelength (mm) Intrabeam viewing (seconds) Diffuse viewing (seconds) to 30,000 30,000 to 600 to 10 600 to 1,000 10 10 Values are taken from ANSI Suggested exposure times for eyewear design. Use actual times when known. Other ? Exercise special care – During alignment – With invisible beams – Where people not involved in the operation can be exposed to the beam ? Precautions for public displays apply
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