Video: Dab tsi yog lub hauv paus ntawm illumination nyob rau hauv electron microscope?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv kev sib kis electron microscope (TEM), the qhov chaw ntawm illumination yog beam ntawm electrons ntawm luv luv wavelength, emissions los ntawm ib tug tungsten filament nyob rau sab saum toj ntawm ib tug cylindrical kem ntawm txog 2 m siab. Tag nrho cov optical system ntawm lub microscope yog nyob rau hauv lub tshuab nqus tsev vacuum.
Tsis tas li ntawd, lub teeb ci hauv electron microscope yog dab tsi?
Cov electron microscope muaj lub zog daws teeb meem. Qhov no yog vim qhov tsawg wavelength ntawm cov hluav taws xob nqaj. Li no qhov kaj hauv electron microscope yog beam electrons . Yog li, cov lus teb raug yog 'Beam of electrons '.
Ib yam li ntawd, lub hauv paus ntawm electron yog dab tsi? Peb siv ob hom electron qhov chaw hauv TEMs: thawj hom hu ua thermionic qhov chaw , uas, raws li lub npe qhia, tsim electrons thaum rhuab, thiab hom thib ob yog lub teb-emission qhov chaw , uas ua electrons Thaum lub peev xwm loj hluav taws xob tau thov ntawm nws thiab anode.
Tsis tas li ntawd, dab tsi yog lub hauv paus ntawm illumination nyob rau hauv compound microscope?
Cov teeb pom kev zoo qhov system. Cov teeb pom kev zoo system ntawm tus qauv kho qhov muag microscope yog tsim los xa lub teeb los ntawm ib qho khoom translucent rau saib. Nyob rau hauv ib tug niaj hnub microscope nws muaj lub teeb qhov chaw , xws li lub teeb hluav taws xob lossis lub teeb pom kev zoo diode, thiab lub lens system tsim cov condenser.
Lub hauv paus ntsiab lus ntawm tem yog dab tsi?
Cov kis tau tus mob electron microscopy ( TEM ) txoj cai , raws li lub npe qhia, yog siv cov kis electrons; cov electrons uas dhau los ntawm cov qauv ua ntej lawv tau sau.
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