lasersafetyatfermilab-wenkub
2022-10-23 15:34:32 本頁(yè)面
【正文】 n potentiallyexposed people (., doors) ? Avoid longterm posting – People will learn to ignore warning – Mags, velcro, illumination Signs amp。 Health Rule – Locked into “2020” version of ANSI standard Some acronyms ? LSO Laser Safety Officer ? MPE Maximum Permissible Exposure – The max amount of laser radiation that doesn’t cause a harmful effect (units are J/cm2 or W/cm2) – BTW – The MPE is a plex function of wavelength, modulation amp。 3a = few requirements ? High Class 3b amp。 4 = many requirements ? BTW Consumer products are usually “safe” – Read and obey warning labels – Don’t take things apart Some lasers Fermilab ? Class 3b and 4 systems – mostly physics apps – Class 3b nitrogen lasers to calibrate scintillation detectors – Class 4 Nd:YAG lasers for photonparticle interactions or material applications ? Class 2 and 3a systems – often diode lasers – Pointers, scanners amp。 exposure duration ? NHZ Nominal Hazard Zone – The space within which the MPE is exceeded – Includes direct, reflected 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 。 approval by LSO a
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