Hauvlaser kev nyab xeeb, MPE stands rau Qhov Tshaj Tawm Tshaj Tawm Tshaj Tawm.
MPE yog dab tsi?
CovMaximum Permissible Exposure (MPE)yog covqib siab tshaj ntawm laser hluav taws xobuas tus neeg yuav raug nthuav tawm -tsis muaj kev phom sij lossis kev puas tsuaj lom lomrau lub qhov muag lossis daim tawv nqaij- nyob rau hauv cov xwm txheej ntawm lub sij hawm raug, wavelength, thiab hom ntaub so ntswg.
Nws yog iblub tswv yim tseem ceebhauvlaser kev nyab xeebCov qauv (xws li ANSI Z136.1 hauv Teb Chaws Asmeskas thiab IEC 60825 thoob ntiaj teb) thiab ua lub hauv paus rau kev tshawb fawb:
Classifying lasers,
Tsim kev tiv thaiv,
Xam qhov kev ncua deb (piv txwv li, Nominal Ocular Hazard Distance - NOHD),
Xaiv cov khoom siv tiv thaiv tus kheej tsim nyog (PPE), xws lilaser kev ruaj ntseg eyewear.
Cov yam ntxwv tseem ceeb ntawm MPE
Wavelength -nyob ntawm
Lub qhov muag thiab daim tawv nqaij nqus lub teeb sib txawv ntawm ntau lub wavelengths. Piv txwv li:
400-1400 nm(pom thiab nyob ze-infrared): tsom rau ntawm lub retina → qis MPE (muaj kev phom sij ntau dua).
< 400 nm(UV): Absorbed los ntawm cornea/lens → kev pheej hmoo ntawm photokeratitis los yog cataracts.
>1 400 nm(far-infrared): Absorbed ntawm pob ntseg nto → txaus ntshai ntawm pob txha kub hnyiab.
Kev Tiv Thaiv Kab Mob -nyob ntawm
MPE qhov tseem ceeb yog siab dua rau qhov raug luv luv (piv txwv li, nanoseconds) thiab qis dua rau lub sijhawm ntev (piv txwv li, vib nas this mus rau teev), xav txog seb cov ntaub so ntswg teb li cas rau thermal lossis photochemical puas nyob rau lub sijhawm.
Cov ntaub so ntswg-Specific
Sib cais MPE txwv muaj rau:
Covpob kws, lens, thiabretinantawm qhov muag,
Covtawv nqaij(rau UV thiab siab - zog IR / pom lasers).
Qhia hauv Radiometric Units
Raws li qhov tshwm sim tshwm sim, MPE tau muab raws li:
Irradiance(W / m² lossis W / cm²) rau kev txuas ntxiv lossis ntev -pulse raug,
Radiant raug(J / m² lossis J / cm²) rau cov tshuab laser.
Piv txwv: MPE hauv Kev Xyaum
Rau ibnruam-wave (CW) laser ntawm 532 nm (ntsuab)saib rau 0.25 vib nas this (lub sij hawm tib neeg aversion teb), MPE yog kwv yees li2.55 × 10⁻³ W/cm².
Yog hais tias laser beam xa1 W / cm²rau qhov muag, nws tshaj MPE los ntawm ze li ntawm400x ib-ua rau muaj kev pheej hmoo raug mob rau lub qhov muag loj. Qhov kev suav no pab txiav txim siab:
Seb lub laser yog Class 3B lossis Class 4,
Dab tsiOptical Density (OD)yog xav tau nyob rau hauvtsom iav kev nyab xeeb,
Nyob deb npaum li cas ib tug yuav tsum sawv ntawm lub nqaj qhib kom nyob hauv qab MPE (NOHD).
Lus Cim Tseem Ceeb
MPE yogtsis yog ib tug ntse ciam teb ntawm "kev nyab xeeb" thiab "tsis nyab xeeb."Nws suav nrog cov yam ntxwv ntawm kev nyab xeeb thiab sawv cev rau qib uas covQhov tshwm sim ntawm kev raug mob yog tsawg heevrau cov pejxeem. Txawm li cas los, exposureshauv qab MPEtseem tuaj yeem ua rau tsis xis nyob (piv txwv li, glare, tom qab duab), thiabtus kheej susceptibilitytuaj yeem sib txawv.
Cov ntsiab lus
MPE=Kev tso cai ntau tshaj
Nws txhais covsiab tshaj laser zog los yog lub zogsuav tias muaj kev nyab xeeb rau kev kis ntawm qhov muag lossis tawv nqaij.
Nws nyob ntawmwavelength, lub sij hawm raug, thiab hom ntaub so ntswg.
Nws yog tusLub hauv paus ntawm kev soj ntsuam kev phom sij laserthiab kev ua raws cai.
Kev nkag siab txog MPE tso cai rau cov kws tshaj lij kev nyab xeeb, cov kws tshawb fawb, thiab cov tswv lag luam los siv cov kev tswj hwm zoo thiab tiv thaiv ob qho tib si mob thiab mob laser- cuam tshuam txog kev raug mob.