Class 3B lasers yognruab nrab- mus rau siab - pheej hmoolaser tshuab uas tuaj yeem ua rauqhov muag raug mob tam sim ntawd-txawm los ntawm kev saib ncaj qha lossis specular (daim iav-zoo li) kev xav. Vim li no, tsim nyogkev tiv thaiv qhov muagtsis xaiv; nws yog qhov yuav tsum tau uakev ruaj ntseg Thaum twg Class 3B lasers siv sab nraum lub kaw lus kaw, cov tshuab sib txuas.
Phau ntawv qhia no piav qhia txog kev phom sij ntawm Class 3B lasers thiab yuav ua li cas xaiv qhov zoo, ua raws li kev tiv thaiv qhov muag raws li cov qauv kev nyab xeeb tsim.
Class 3B Laser yog dab tsi?
Raws li cov qauv thoob ntiaj teb (IEC 60825-1) thiab US cov cai (ANSI Z136.1), aClass 3B laseryog txhais los ntawm nws cov zis zog:
Nruam yoj (CW) lasersHwj chim: 5mW rau 500mW
Pulsed lasers: Cov qib hluav taws xob uas siab tshaj Class 3R txwv tab sis tsis ncav cuag Qib 4 qhov pib
Tseem ceeb txaus ntshai:
Kev nthuav tawm ncaj qhamus rau lub beam (txawm yog ib feem ntawm ib tug thib ob) tuaj yeem ua rauretinal burns, tsis pom kev mus tas li, los yog qhov muag tsis pom kev.
Specular reflections(piv txwv li, tawm iav, hlau, lossis optics) yog qhov txaus ntshai sib npaug.
Diffuse reflections(xws li, tawm ntawm daim ntawv los yog matte nto) feem ntau muaj kev nyab xeeb-tab sis tsis tas li, tshwj xeeb tshaj yog nrog siab dua - lub zog 3B lasers ze ntawm 500 mW txwv.
⚠️ Nco tseg: Class 3B lasersyuav tsum tsis txhob saib ncaj qha, txawm tias qhov muag liab qab los yog kho qhov muag pab zoo li microscopes lossis telescopes.
Thaum twg thiaj yuav tsum tau kev tiv thaiv qhov muag?
Yuav tsum muaj kev tiv thaiv qhov muagthaum twg:
Lub laser ua haujlwm hauv ib qhoqhib -beam configuration(tsis nyob rau hauv tag nrho).
Muajmuaj peev xwm ncaj qha los yog cuam tshuam beam raugrau qhov muag.
Engineering tswj (piv txwv li, beam enclosures, interlocks) yogtsis txaustshem tawm kev pheej hmoo.
Txawm tias thaum lub sij hawm ua raws li cov txheej txheem-thaum tsawg- lub zog pom cov kab teeb raug siv- cov tsom iav kom zoo yuav tsum hnav yog tias lub laser raug cais raws li 3B.
Yuav Ua Li Cas Xaiv Qhov Kev Tiv Thaiv Qhov Muag Zoo rau Chav Kawm 3B Lasers
Siv taulaser kev ruaj ntseg eyewearyuav tsum tau xaiv raws lipeb qhov tseem ceeb tsis tau:
1. Laser wavelength (nm)
Cov ntaub ntawv sib txawv nqus lossis thaiv lub teeb sib txawv nyob ntawm qhov wavelength. Common Class 3B wavelengths muaj xws li:
532nm ua(ntsuab, zaus-ob npaug Nd:YAG)
635 nm, 650 nm(Liab diode lasers)
1064nm ua(infrared, Nd: YAG lossis fiber ntau lasers)
✅ Koj cov tsom iav yuav tsum raug ntsuas rau qhovqhov tseeb wavelength(s)ntawm koj lub laser.
2. Optical Density (OD)
OD ntsuas ntau npaum li cas cov iav tsom iav txo qhov siv laser. Rau Chav Kawm 3B, OD yuav tsum tau ua kom lub teeb kis tau zooHauv qab qhov Maximum Permissible Exposure (MPE).
Piv txwv:
200 mW (0.2 W) CW laser ntawm 532 nm
MPE rau 0.25 vib nas this (aversion teb lub sij hawm) ≈ 2.55 × 10⁻³ W / cm²
Yuav tsum tau OD ≈log₁₀(0.2 / 0.00255) ≈ 1.9 → Round up to OD 2+
Hauv kev xyaum,OD 3 to OD 5yog ib qho rau Class 3B pom lasers los muab kev nyab xeeb margin.
3. Laser ua haujlwm hom
CW (nruam nthwv dej): Kev tiv thaiv raws li lub zog (W)
Pulsed: Yuav tsum tau xav txog lub zog ntawm lub zog (J), lub sijhawm (ns, ps), thiab tus nqi rov ua dua
Cov looj tsom iav yuav tsum raug ntsuas rau hom kom raug kom ntseeg tau tias nws tuaj yeem tuav lub zog siab kawg yam tsis muaj kev puas tsuaj.
Safety Standards rauLaser Eyewear
EN 207 (Tebchaws Europe)
Yuav tsum tau looj tsom iav kom dhau adirect laser exposure test(hluav taws -los ntawm kev tiv thaiv).
Ua cim nrog:Laser hom (piv txwv li, D rau CW, kuv rau pulsed), wavelength, thiab tiv thaiv qib (piv txwv li, 532 4D).
Rau Chav Kawm 3B, EN 207- cov looj tsom iav ua raws li tau pom zoo-txawm tias kev suav OD zoo li txaus.
ANSI Z136.1 (Tebchaws Asmeskas)
tsom rauOD-raws li kev xaivsiv MPE suav.
Eyewear yuav tsum tau sau nrog:Wavelength, OD, thiab cov qauv siv tau.
🔍 Tseem ceeb: OD ib leeg uatsis lav kev nyab xeebyog hais tias cov khoom siv lens degrades los yog kub hnyiab nyob rau hauv raug tiag. EN 207 hais txog qhov no los ntawm kev sim ua kom muaj zog.
Ntxiv nta kom xav txog
Visible Light Transmission (VLT): Higher VLT (>15-20%) txhim kho kev pom thiab txo qhov muag pom, tshwj xeeb tshaj yog rau cov lasers pom.
Kev nplij siab thiab haum: Yuav tsum hnav tau rau lub sijhawm ntev thiab sib haum nrog lwm yam PPE (xws li, daim npog ntsej muag).
Kev tiv thaiv sab: Wraparound tsim los yog tsom iav los thaiv peripheral reflections.
Durability: Scratch-cov coatings tiv taus ntev kev pab cuam lub neej thiab tswj kev tiv thaiv.
Tsis Ua Dab Tsi
❌ Siv generic "laser tsom iav" yam tsis tau txheeb xyuas qhov tseeb
❌ Xav tias looj tsom iav dub los yog tsom iav kev nyab xeeb ib txwm muaj kev tiv thaiv
❌ Rov qab siv cov looj tsom iav uas puas los yog khawb- lo ntsiab muag tsis pom zoo tuaj yeem ua tsis tiav thaum raug
❌ Cia siab rau tsom iav ib leeg-ib txwm ua ke nrog kev tswj xyuas engineering (beam blocks, enclosures) thiab cov txheej txheem kev tswj hwm (kev cob qhia, kev tswj xyuas)
Summary : Tseem Tos Koj
Class 3B laserstuaj yeem ua rau tam sim, qhov muag mus tas li.
Ib txwm hnavwavelength-specific, OD-tsim nyog laser kev ruaj ntseg eyewearthaum qhib - nqaj ua haujlwm.
Xaiv cov looj tsom iav uas sib ntsibTS EN 207(rau durability) los yog xaiv ibANSI Z136.1cov lus qhia.
Ua kom tiav daim ntawv lo:wavelength, OD, thiab ua raws li tus qauvyuav tsum tau cim kom meej.
Muab cov looj tsom iav nrog lwm cov khaubncaws sab nraud povtseg -tsis txhob cia siab rau PPE ib leeg.
Los ntawm kev xaiv thiab siv txoj cai qhov muag tiv thaiv, koj txo qhov kev pheej hmoo ntawm kev raug mob irreversible thaum ua hauj lwm nrog Class 3B lasers. Thaum tsis ntseeg, nrog koj lub koom haumLaser Safety Officer (LSO)los yog xa mus rau koj cov kev cai tswj hwm hauv zos.