Taw qhia rau cov yam ntxwv ntawm kev ua haujlwm ntawm scanning electron microscopes
Taw qhia rau cov yam ntxwv ntawm kev ua haujlwm ntawm scanning electron microscopes
Muaj ntau ntau hom scanning electron microscopes, thiab ntau hom scanning electron microscopes muaj qhov sib txawv hauv kev ua haujlwm. Raws li hom phom electron, nws tuaj yeem muab faib ua peb hom: teb emission electron phom, tungsten hlau phom thiab lanthanum hexaboride [5]. Ntawm lawv, teb emission scanning electron microscopes tuaj yeem muab faib ua qhov chaw txias emission scanning electron microscopes thiab kub field emission scanning electron microscopes raws li lub teeb pom kev zoo. Txias teb emission scanning electron microscopy muaj qhov yuav tsum tau ua rau lub tshuab nqus tsev, tsis ruaj tsis khov beam tam sim no, luv luv kev pab cuam lub neej ntawm lub emitter, thiab yuav tsum tau ntxuav lub taub hau tsis tu ncua. Nws yog txwv rau ib qho kev soj ntsuam cov duab thiab muaj qhov txwv tsis pub siv ntau yam; thaum thermal teb emission scanning electron microscopy tsis tas li xwb Nws muaj lub sijhawm ua haujlwm ntev thiab tuaj yeem siv nrog ntau yam khoom siv kom ua tiav kev tsom xam. Hauv thaj chaw ntawm geology, peb tsis tsuas yog yuav tsum tau ua qhov kev soj ntsuam morphological ua ntej ntawm cov qauv, tab sis kuj yuav tsum tau muab cov tshuaj ntsuam xyuas los txheeb xyuas lwm yam khoom ntawm cov qauv, yog li thermal field emission scanning electron microscopy yog siv ntau dua.
Lub tshuab ntsuas hluav taws xob ntsuas hluav taws xob (SEM) yog qhov ntsuas qhov ntsuas qhov ntsuas loj siv rau kev daws teeb meem micro-region morphology tsom xam. Nws muaj cov yam ntxwv ntawm qhov tob ntawm qhov loj, qhov kev daws teeb meem siab, kev ntsuas qhov xav tau, muaj zog peb-dimensional kev txiav txim siab, kev nthuav dav dav, thiab cov qauv uas yuav tsum tau sim tuaj yeem tig thiab tig rau hauv qhov chaw peb sab. Tsis tas li ntawd, nws muaj qhov zoo ntawm kev nplua nuj ntawm cov qauv ntsuas, yuav luag tsis muaj kev puas tsuaj lossis kev sib kis ntawm cov qauv qub, thiab muaj peev xwm kom tau txais morphology, qauv, muaj pes tsawg leeg thiab cov ntaub ntawv crystallographic tib lub sijhawm. Tam sim no, scanning electron microscopes tau siv dav hauv kev tshawb fawb microscopic hauv kev tshawb fawb txog lub neej, physics, chemistry, kev ncaj ncees, ntiaj teb kev tshawb fawb, cov ntaub ntawv tshawb fawb, thiab kev tsim khoom lag luam. Nyob rau hauv lub ntiaj teb sciences ib leeg, nws muaj xws li crystallography, mineralogy, thiab mineral deposits. , sedimentology, geochemistry, gemology, micropaleontology, astronomical geology, roj thiab roj geology, engineering geology thiab structural geology, thiab lwm yam.
Txawm hais tias scanning electron microscopy yog lub hnub qub nce hauv tsev neeg lub tshuab tsom, nws tab tom txhim kho sai vim nws muaj ntau yam zoo.
1. Qhov kev daws teeb meem ntawm qhov ntsuas yog siab. Nws tuaj yeem soj ntsuam cov ntsiab lus ntawm li 6nm ntawm qhov chaw ntawm cov qauv los ntawm cov duab thib ob electron. Siv rab phom LaB6 electron, nws tuaj yeem txhim kho ntxiv mus rau 3nm.
2 Lub ntsuas ntsuas qhov kev nthuav dav muaj ntau yam kev hloov pauv thiab tuaj yeem hloov kho tsis tu ncua. Yog li ntawd, koj tuaj yeem xaiv qhov ntau thiab tsawg ntawm thaj chaw saib rau kev soj ntsuam raws li koj xav tau. Nyob rau tib lub sijhawm, koj tuaj yeem tau txais cov duab ci ntsa iab ntawm qhov loj loj uas nyuaj rau kev ua tiav nrog kev sib kis ntawm electron microscopes.
3. Qhov tob ntawm daim teb rau kev soj ntsuam tus qauv yog qhov loj, qhov chaw ntawm kev pom yog loj, thiab cov duab yog tag nrho ntawm peb-dimensionality. Qhov chaw ntxhib nrog kev hloov pauv loj thiab cov duab tsis sib xws ntawm cov duab ntawm cov qauv tuaj yeem pom ncaj qha, ua rau tib neeg xav txog kev mus xyuas lub ntiaj teb microscopic ntawm tus neeg.
4. Cov qauv kev npaj yog yooj yim. Ntev npaum li qhov thaiv lossis cov qauv hmoov me ntsis ua tiav lossis tsis ua tiav, nws tuaj yeem muab tso ncaj qha rau hauv lub tshuab ntsuas hluav taws xob scanning rau kev soj ntsuam, yog li nws yog ze rau lub xeev ntawm cov teeb meem.
5. Cov duab zoo tuaj yeem tswj tau zoo thiab txhim kho los ntawm cov txheej txheem hluav taws xob, xws li kev saib xyuas tsis siv neeg ntawm qhov ci thiab qhov sib txawv, cov qauv qaij lub kaum sab xis kho, cov duab tig, lossis txhim kho cov duab zoo sib xws los ntawm Y modulation, nrog rau qhov ci thiab qhov tsaus ntuj ntawm txhua qhov ib feem ntawm daim duab. Nruab nrab. Siv cov khoom siv dual magnification lossis cov duab xaiv, cov duab uas muaj qhov sib txawv tuaj yeem pom ntawm lub vijtsam fluorescent tib lub sijhawm.
6 Kev ntsuam xyuas dav tuaj yeem ua tiav. Nruab nrog lub wavelength dispersive X-ray spectrometer (WDX) los yog lub zog dispersive X-ray spectrometer (EDX), nws muaj kev ua haujlwm ntawm electron sojntsuam thiab tseem tuaj yeem ntes cov electrons, X-rays, cathode fluorescence, kis electrons, thiab Auger. emitted los ntawm tus qauv. Electronics thiab lwm yam. Daim ntawv thov nthuav dav ntawm scanning electron microscopy mus rau ntau yam kev tsom xam ntawm microscopic thiab micro cheeb tsam qhia tau hais tias muaj ntau yam ntawm scanning electron microscopy. Tsis tas li ntawd, koj tuaj yeem txheeb xyuas cov cheeb tsam me me ntawm cov qauv thaum saib cov duab morphology; los ntawm kev txhim kho cov khoom siv hluav taws xob semiconductor, koj tuaj yeem saib ncaj qha rau PN hlws ris thiab microscopic defects nyob rau hauv lub transistor lossis integrated circuit los ntawm electromotive force duab amplifier. Txij li thaum ntau lub tshuab ntsuas hluav taws xob tshuab hluav taws xob hluav taws xob tau pom tau tias tsis siv neeg thiab semi-automatic tswj los ntawm cov khoos phis tawj hluav taws xob, qhov ceev ntawm kev tshuaj ntsuam xyuas tau zoo heev.
