Thaum lub teeb 320nm UV irradiates COP (Cyclo Olefin Polymer) cov khoom siv lens, lub hauv paus ntsiab lus tseem ceeb ua rau kub nce siab nyob rau hauv qhov tsis yog - radiative hloov pauv nqus ntawm photon zog. Tsuas yog hais tias, txawm hais tias COP cov ntaub ntawv muaj qhov zoo tshaj plaws ultraviolet transmittance, lawv tsis tuaj yeem tso cai 100% ntawm 320nm photons hla. Lub zog ntawm cov photons uas raug kaw tsis tuaj yeem ploj ntawm huab cua nyias; Lawv sib tsoo nrog cov khoom siv molecules, ua rau muaj zog molecular kev co, yog li ncaj qha hloov lub teeb lub zog rau hauv thermal zog. Tsis tas li ntawd, cov hluav taws xob infrared nrog rau lub teeb ci (yog tias muaj) thiab thermal conduction ntawm LED nti nws tus kheej kuj tseem yuav ua rau qhov kub ntawm lub lens nce.
Tau ua haujlwm hauv qhov chaw kuaj pom qhov muag tau ntau tshaj kaum xyoo, kuv tau pom ntau qhov xwm txheej uas lub lens deformation thiab txawm tias scorching tshwm sim vim tsis saib xyuas ntawm "cov nyhuv photothermal". Kuv nco qab ib zaug sim lub siab -lub zog UV kho; tsuas yog vim lub wavelength deviated los ntawm 5nm, lub pob tshab pob tshab los ua scalding kub thiab yellowed nyob rau hauv ob peb feeb. Qhov no qhia kuv tias cov ntsiab lus txiav txim siab ua tiav lossis tsis ua tiav. Tshwj xeeb tshaj yog thaum cuam tshuam nrog siab -zog wavebands zoo li 320nm, kev nkag siab txog cov txheej txheem ntawm lub cev yog qhov tseem ceeb tshaj qhov tsuas yog saib ntawm cov lus ntsuas.
Thaum tshav kub kub Generation los ntawm Molecular Vibration: COP molecules nqus ib feem ntawm UV photon zog, ua rau lub lattice vibration, thiab lub microscopic kinetic zog hloov mus rau hauv macroscopic tshav kub.
Tsis-100% Lub Teeb Transmittance: 320nm yog nyob ntawm ntug ntawm UVB band. COP muaj qhov sib nqus nqus coefficient hauv qhov waveband no; qhov ntau dua lub thickness, lub tshav kub yog absorbed.
Stokes Hloov: Ib feem ntawm lub teeb lub zog, tom qab zoo siab, tsis yog rov- tawm hauv lub teeb tab sis dissipated li cua sov (tsis yog- radiative so).
Lub teeb Source Thermal Radiation: Yog tias UV teeb hlaws ntim cov txheej txheem tsis zoo, ntxiv rau lub teeb ci ultraviolet, nrog rau cov cua sov (infrared waveband) kuj yuav tawg.
Aging Positive Feedback: Ntev- lub sij hawm irradiation ua rau cov khoom aging thiab yellowing. Cov ntaub ntawv daj tau nqus ntau lub teeb ultraviolet, ua rau muaj qhov kub thiab txias ntxiv - ntawm - tswj.
Zog ceev tsom xam: High irradiance (mW / cm²) txhais tau hais tias lub zog ntawm ib chav tsev ntim ntau tshaj qhov kub dissipation tus nqi ntawm cov khoom thermal conduction.
Ntau tus phooj ywg engineers nug, tsis yog cov khoom siv COP hu ua "optical-qib" yas? Vim li cas nws tseem ua kom sov? Qhov tseeb, qhov no yuav tsum pib los ntawm lub ntiaj teb microscopic.
Photon Energy Absorption thiab Molecular Vibration: Nkag siab txog kev tsim hluav taws xob los ntawm Microscopic Perspective
Koj tuaj yeem xav txog lub teeb UV teeb uas suav tsis txheeb "cov mos txwv lub zog" ya ntawm kev kub ceev. Ib qho photon nrog lub wavelength ntawm 320nm muaj zog heev. Thaum cov "cov mos txwv" no dhau los ntawm COP lens, feem ntau ntawm lawv dhau los ntawm kev sib tw, tab sis tus lej me me sib tsoo nrog cov saw hlau polymer ntawm COP.
Cov molecules cuam tshuam zoo li raug thawb, pib "co" lossis "rub" hnyav. Nyob rau hauv physics, qhov intensification ntawm cov irregular zog ntawm xws li microscopic hais yog macroscopically manifested raws li ib tug kub nce. Qhov no yog cov txheej txheem yooj yim tshaj plaws ntawm kev hloov lub teeb lub zog rau hauv lub zog sab hauv.
Kev sib raug zoo ntawm lub teeb Transmittance thiab Absorption Coefficient ntawm COP cov ntaub ntawv hauv UVB Band
Txawm hais tias COP yuav luag tag nrho cov pob tshab kom pom lub teeb, qhov xwm txheej txawv ntawm cov kab hluav taws xob ultraviolet . 320nm yog nyob rau ntawm ntug ntawm UVB band (280nm - 315}}nm / 320nm).
Nyob rau hauv no waveband, COP cov ntaub ntawv yog tsis kiag li "invisible". Nws muaj qee qhov nqus coefficient. Txawm hais tias qhov nqus tau tsuas yog 5%, rau qhov siab - lub zog ntom ntom UV teeb, qhov no 5% ntawm lub zog tso rau hauv lub ntim me me ntawm lub lens yog txaus los ua kom qhov kub thiab txias ntawm kaum degrees hauv lub sijhawm luv luv.
Lub luag haujlwm tseem ceeb ntawm Tsis yog -radiative Transition in Temperature Rise
Qhov no yog ib lub tswv yim uas suab kev kawm tab sis ua tau yooj yim to taub. Tom qab cov khoom siv molecules nqus photon zog thiab dhia mus rau "lub xeev zoo siab", lawv yuav tsum tso lub zog no kom rov qab mus rau "lub xeev ruaj khov" (hauv av).
Tswv yim: "Hauv cov tshuab kho qhov muag, kev txuag hluav taws xob yog ib txoj cai hlau. Yog tias lub teeb lub zog nqus tsis tau tawm los ua fluorescence (radiative hloov), ces yuav luag 100% ntawm nws yuav raug hloov mus rau hauv thermal zog los ntawm lattice vibration. Qhov no yog li no -hu ua tsis yog - radiative hloov, thiab nws kuj yog lub ntsiab culprit. "
320nm Wavelength yam ntxwv thiab kho qhov muag sib cuam tshuam tshuab nrog COP cov ntaub ntawv
Siab -Photon yam ntxwv tsom xam ntawm UVB Band
Lub zog photon ntawm 320nm yog kwv yees li 3.88 eV (electron volts). Qhov no ntau dua li lub zog ntawm lub teeb xiav lossis ntsuab peb pom txhua hnub. Xws li siab -zog photons muaj peev xwm ua rau cov tshuaj lom neeg sib txuas.
Rau COP lo ntsiab muag, qhov no txhais tau hais tias lawv raug tsis yog "lub teeb irradiation" nkaus xwb tab sis kuj mus rau siab - siv zog foob pob tawg. Yog tias lub teeb ci tsis huv thiab sib xyaw nrog luv luv - wavelength lub teeb (xws li hauv qab 300nm), cov cua kub thiab kev laus ntawm cov khoom yuav nce exponentially.
Teb ntawm COP (Cyclo Olefin Polymer) Molecular Structure rau Specific Wavelengths
Cov ntaub ntawv COP yog nrov vim lawv qhov nqus dej tsawg thiab cov pob tshab siab. Txawm li cas los xij, qee cov tshuaj lom neeg hauv lawv cov qauv molecular yuav "resonate" nrog 320nm lub teeb.
Thaum resonant absorption tshwm sim, lub teeb lub zog yuav raug kaw. Cov qib sib txawv ntawm COP (xws li Zeonex lossis Topas) ua qhov txawv me ntsis ntawm 320nm, tab sis tag nrho, raws li lub wavelength hloov mus rau luv luv -yoj kev taw qhia, lub teeb xa tawm yuav poob qis, thiab kev nqus cua sov yuav nce siab raws li.
Daim ntawv thov ntawm Beer -Lambert Txoj Cai hauv Kev Ntsuas Lens Thickness thiab Thaum tshav kub kub nqus
Muaj ib txoj cai ntawm lub cev yooj yim ntawm kev ua haujlwm ntawm no -Beer-Lambert Law. Nws qhia peb tias absorbance yog proportional rau txoj kev ntev ntawm lub teeb nkag mus (piv txwv li, lub thickness ntawm lub lens).
Cias muab, qhov tuab ntawm koj lub lens yog, lub teeb tsawg dua tuaj yeem dhau mus, thiab lub teeb ntau yog "absorbed" thiab hloov mus rau hauv tshav kub. Yog li ntawd, hauv kev tsim lub 320nm optical system, ua rau lub lens nyias li sai tau yog ib txoj kev yooj yim thiab siv tau zoo los txo qhov kub thiab txias.
Lub cev hloov pauv cuam tshuam rau qhov ntsuas kub siab nce ntawm lub lens
Tsis yog-Txoj kev sib raug zoo ntawm Irradiance thiab Zog Txuag
Coob leej neeg yuam kev ntseeg tias qhov kub thiab txias yog linear: lub teeb ntev dua, qhov kub dua. Qhov tseeb, nws tsis yog -linear.
Thaum cov irradiance (mW / cm²) ncav cuag ib qho chaw pib, cov cua sov hauv cov khoom tsis tuaj yeem dissipated los ntawm nto convection nyob rau hauv lub sij hawm, thiab cua sov yuav "sau" nyob rau hauv nruab nrab ntawm lub lens. Qhov kev sib xyaw ntawm cov cua sov no yuav ua rau muaj qhov kub thiab txias hauv zos, ua rau "qhov kub thiab txias", uas yog qhov txaus ntshai tshaj li cov cua sov sib xws thiab tuaj yeem ua rau lub lens tawg tau yooj yim.
Impact of Continuous Wave (CW) thiab Pulse Width Modulation (PWM) Modes on Thermal Relaxation Time
Yog tias lub teeb UV tau khaws cia tsis tu ncua (CW hom), lub lens yuav tsis muaj sijhawm "ua pa".
Raws li kev sib piv cov ntaub ntawv los ntawm cov chaw soj nstuam photothermal, nyob rau hauv tib lub zog nruab nrab, siv lub tshuab mem tes (PWM) tsav tsheb nrog 50% lub luag haujlwm lub voj voog tuaj yeem txo qhov kub siab ntawm lub lens los ntawm 15% mus rau 25% piv nrog yoj hom txuas ntxiv. Qhov no yog vim hais tias lub sij hawm mem tes muab cov khoom siv nrog "thermal so" lub sij hawm, tso cai rau cua sov kom muaj sij hawm los tawm.
Stokes Hloov: Cov Cuab Yeej Hluav Taws Xob hauv cov nyhuv Fluorescence
Qee lub sij hawm koj yuav pom tias COP lo ntsiab muag emit ib lub teeb xiav faint nyob rau hauv khaus UV irradiation; Qhov no yog cov nyhuv fluorescence. Tab sis qhov no tsis yog qhov zoo.
Qhov no hu ua Stokes Shift. Piv txwv li, cov khoom siv absorbs 320nm lub teeb thiab emits 400nm fluorescence. Lub zog sib txawv ntawm lawv nyob qhov twg (320nm lub teeb muaj lub zog siab dua 400nm lub teeb) mus? Yog, tag nrho nws yog hloov mus rau hauv tshav kub thiab khaws cia rau hauv lub lens.
Thermal Performance Limits thiab Failure Risks ntawm COP cov ntaub ntawv
Peb them nyiaj ntau heev rau qhov kub thiab txias vim cov ntaub ntawv muaj kev txwv. Thaum txoj kab liab hla, qhov tshwm sim yuav loj heev.
Txhua lub yas muaj qhov "softening point" hu ua iav hloov kub (Tg). Rau cov ntaub ntawv COP, nws feem ntau yog nyob nruab nrab ntawm 100℃thiab 160℃(nyob ntawm qib).
Yog hais tias lub tshav kub tsim los ntawm 320nm irradiation ua rau lub lens kub mus txog Tg, lub lens yuav ua mos. Vim qhov kev tso tawm ntawm kev ntxhov siab sab hauv, lub ntsej muag nkhaus uas tsim nyog yuav raug cuam tshuam me ntsis. Rau precision optical systems, qhov no txhais tau hais tias txoj kev kho qhov muag deviates thiab tsom tsis ua hauj lwm.
Qhov no yog lub voj voog vicious. Ntev - lub sij hawm irradiation nrog 320nm ultraviolet lub teeb yuav ua txhaum cov polymer chains ntawm COP, tsim dawb radicals, thiab ua rau cov khoom daj.
Lub lens yellowed yuav muaj qhov nce ntxivhauv UV teebnqus tus nqi. Lub lens pob tshab qub dhau los ua "kub absorber", thiab nws qhov kub thiab txias yuav siab dua li ntawm lub lens tshiab, nws thiaj li ua rau burnout.
Qhov tseem ceeb ntawm Spectral Purity (FWHM): Txo Infrared Parasitic Radiation
Tsawg-zoo UV teeb hlaws hlaws tawm tsis yog tsuas yog 320nm ultraviolet lub teeb tab sis kuj muaj ntau ntawm cov hluav taws xob nrog infrared (IR) hluav taws xob. Cov hluav taws xob infrared yog cov hluav taws xob hluav taws xob ntshiab- nws tsis muaj lub hom phiaj rau kev kho lossis ua kom tsis muaj menyuam thiab tsuas yog ua rau lub lens cua sov.
Xaiv cov tuam ntxhab nrog cov khoom lag luam paub tab, s. Lawv cov hlaws teeb muaj cov spectral purity siab thiab nqaim dav dav ntawm ib nrab siab tshaj plaws (FWHM), uas txo qis infrared thermal tawg thiab hauv paus "txo cov cua sov". Rau cov ncauj lus kom ntxaws teeb hlaws specifications, thov mus saibUVA320nm Lamp Beads: Nta thiab daim ntawv thov.
Kev cuam tshuam ntawm LED Pob Thermal Resistance ntawm Ambient Temperature thiab Lens Convective Thaum tshav kub kub Dissipation
Feem ntau, cov cua sov lo ntsiab muag tsis yog tshwm sim los ntawm lub teeb irradiation tab sis los ntawm kev siv hluav taws xob ncaj qha los ntawm lub hauv paus LED nti.
Yog tias lub teeb ci LED hlaws muaj qhov ua haujlwm siab thermal, cov cua sov uas tsim los ntawm cov nti tsis tuaj yeem ua kom zoo. Qhov ntsuas kub no ua rau huab cua nyob ib puag ncig, tig qhov chaw nyob ib puag ncig COP lens rau hauv "qhov cub". Ua ke nrog cov cua sov nqus los ntawm lub teeb irradiation, lub lens kub yuav inevitably soar. Txais UV LEDs ntim rau hauv cov khoom siv hluav taws xob uas tsis tshua muaj hluav taws xob ua kom muaj cua sov hloov mus rau lub dab dej kub, tiv thaiv tshav kub los ntawm kev xa mus rau lub lens.
Optical Design Optimization: Txo qhov kub hauv zos ntawm Lens Curvature Kho
Kev tsim kho qhov muag kom zoo tuaj yeem yog qhov tseem ceeb rau kev tswj qhov kub thiab txias. Los ntawm kev ua kom zoo ntawm lub lens curvature, lub teeb tuaj yeem dhau los ntawm lub lens ntau dua, tsis txhob siv lub zog ntau dhau ntawm qhov tshwj xeeb ntawm lub lens. Dispersing zog ceev ncaj qha mus rau dispersing tshav kub concentration.
UV Teeb Wavelength Measurement thiab Thermal Effect Verification Standards
Tom qab kev yuav cov teeb UV, peb yuav ua li cas thiaj paub tseeb tias lawv cov wavelength thiab thermal cuam tshuam raws li qhov yuav tsum tau ua?
Kev ntsuas Precise ntawm 320nm Peak Wavelength Siv Kev Sib Txuas Sib Txuas thiab Spectrometer
Tsis txhob cia siab rau ib leeg rau cov ntawv teev npe tshwj xeeb. Nws yog ib qho tseem ceeb uas yuav tau ua cov kev ntsuam xyuas uas siv lub siab -precision spectral analyzer ua ke nrog ib qho kev sib koom ua ke kom paub meej tias lub ncov wavelength yog qhov tseeb ntawm 320nm. Yog hais tias lub wavelength hloov mus rau 300nm los yog qis dua, qhov kev puas tsuaj rau cov ntaub ntawv COP yuav sib npaug, thiab qhov tshwm sim qhov kub thiab txias yuav ua rau hnyav dua.
Daim ntawv thov ntawm Thermal Imaging Technology nyob rau hauv Kev Saib Xyuas COP Lens Surface Temperature Distribution
Tsis tas yuav kwv yees qhov kub thiab txias -peb tuaj yeem pom nws ncaj qha los ntawm kev siv cov duab hluav taws xob infrared los ntes lub lens ua haujlwm.
Koj yuav pom tias cua sov tsis tshua muaj qhov sib npaug; qhov chaw ntawm lub lens feem ntau yog qhov chaw kub tshaj plaws. Thermal imaging muab ib tug meej, intuitive saib ntawm tshav kub dissipation tuag zones, ua kom lub hom phiaj kev hloov kho rau cov cua ducts los yog lub teeb qhov chaw deb ntawm lub teeb rau kev txhim kho thermal tswj.
Q&A:
Nrog lub wavelength ntev dua, 365nm UV teeb muaj lub zog qis dua. Ntxiv mus, cov ntaub ntawv COP feem ntau pom zoo dua lub teeb xa tawm ntawm 365nm dua li ntawm 320nm. Yog li ntawd, nyob rau hauv tib lub hwj chim kho qhov muag, qhov kub thiab txias tshwm sim los ntawm 320nm UV irradiation feem ntau ho siab tshaj qhov ntawd los ntawm 365nm UV irradiation. Qhov no yog qhov tseeb yog vim li cas thiaj li yuav tsum tau them nyiaj rau cov cua kub dissipation tsim thaum siv 320nm UV teeb.
Yog, nws yog qhov txaus ntshai heev. LEDs tuaj yeem ua tauliab hloovlos yogxiav hloovthaum kub nce. Yog tias cov cua kub tsis txaus, qhov sib txuas ntawm qhov kub yuav nce, ua rau lub wavelength drift. Qhov kev sib tw no tuaj yeem hloov lub wavelength mus rau ib pab pawg uas COP cov ntaub ntawv muaj qhov nqus tau siab dua, ua rau qhov kub tsis tau tswj tau.
Irradiance txo qis hauv qhov sib piv rau qhov square ntawm qhov kev ncua deb raws li qhov kev ncua deb nce. Qhov no yog kev lag luam -tawm txheej txheem. Koj yuav tsum nrhiav ib tugqab zib-qhov kev ncua deb uas tsis tsuas yog ua kom muaj kev siv UV txaus kom ua tiav cov haujlwm kho lossis ua kom tsis muaj menyuam, tab sis kuj tseem tuav lub lens kub hauv qab nws cov iav hloov pauv kub (Tg) los ntawm huab cua convection.
Ntawm cov ntaub ntawv yas, COP tam sim no yog cov neeg ua yeeb yam zoo tshaj plaws. Txawm hais tias nws tseem yuav tsim kom muaj cua sov, piv nrog PMMA (uas yog qhov yooj yim rau kev nqus dej thiab deformation) thiab PC (uas yog absorbs ultraviolet lub teeb), COP yog qhov kev xaiv zoo tshaj plaws uas sib npaug lub teeb xa tawm thiab kub ua haujlwm. Yog tias cov peev nyiaj tso cai, fused silica iav yog qhov kev xaiv zoo tshaj plaws, vim nws tsis nqus cua sov los yog tsis muaj kev laus. Txawm li cas los xij, nws tus nqi yog kaum ob npaug ntawm COP.
Hauv cov ntsiab lus, qhov kub nce ntawm COP lo ntsiab muag tshwm sim los ntawm 320nm UV teeb irradiation yog qhov tshwm sim tsis pom hauv photophysics uas tsis tuaj yeem tshem tawm tag nrho, tab sis nws tuaj yeem tswj tau tag nrho.
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