Reflection vs Total Internal Reflection
Reflection thiab tag nrho cov kev xav sab hauv yog qhov tseem ceeb ntawm lub cev ntawm cov nthwv dej. Feem ntau, thaum nthwv dej tawm tsam ntawm ib qho khoom, qhov kev hloov pauv ntawm kev coj ntawm nthwv dej yog hu ua kev xav. Qhov tseem ceeb tshaj plaws thiab paub qhov tseeb txog qhov kev xav yog qhov muaj peev xwm pom cov khoom thaum lub teeb rays tshwm sim los ntawm qhov khoom mus rau qhov muag. Qhov tseeb, tag nrho cov kev xav sab hauv feem ntau yog tham nyob rau hauv qhov kev xav ntawm lub teeb. Muaj ntau yam kev siv ntawm yoj kev xav thiab tag nrho cov kev xav sab hauv xws li ultra suab tshuab thiab sonar technology thiab fiber ntau optics feem. Txij li qhov no yog thaj tsam dav ntawm yoj mechanics, hauv qhov kev sib tham no, peb yuav tham txog qhov tseem ceeb ntawm kev xav thiab tag nrho sab hauv kev xav ntawm lub teeb thiab kev cuam tshuam txoj cai ntawm lub teeb luv luv.
Reflection
Raws li tau hais, qhov kev hloov pauv ntawm cov kev taw qhia ntawm nthwv dej thaum nws tawm tsam ntawm ib qho kev cuam tshuam yog hu ua kev xav. Thaum nws siv rau lub teeb rays, qhov kev xav tshwm sim thaum lub teeb tawm tsam ntawm qhov ci ntsa iab polished (xws li xov xwm). Qhov teeb meem hluav taws xob, qhov qub, thiab cov duab hluav taws xob yog txhua yam nyob hauv tib lub dav hlau thiab lub kaum sab xis ntawm qhov xwm txheej yog sib npaug rau lub kaum sab xis ntawm kev xav. Ntawm no qhov teeb meem hluav taws xob txhais tau tias yog ib qho hluav taws xob mus rau saum npoo. Point ntawm qhov xwm txheej yog qhov chaw uas qhov teeb meem hluav taws xob tawm tsam qhov chaw. Qhov ib txwm yog cov kab kos perpendicular rau ntawm qhov chaw ntawm qhov xwm txheej. Lub reflected rays yog ib feem ntawm qhov xwm txheej rays uas tawm ntawm qhov chaw ntawm qhov xwm txheej. Muaj ob hom teeb pom kev zoo, uas yog hu ua specular reflection thiab diffuse reflection. Specular reflection tshwm sim thaum cov kab hluav taws xob sib luag ntawm qhov xwm txheej tawm tsam ntawm qhov chaw du uas cuam tshuam rau qhov sib npaug, thiab qhov sib txawv ntawm qhov sib txawv tshwm sim thaum cov teeb meem sib npaug ntawm cov hluav taws xob sib tsoo rau ntawm qhov chaw ntxhib uas cuam tshuam tsis xwm yeem mus rau txhua qhov kev taw qhia vim cov dav hlau tsis sib xws ntawm qhov chaw.
Txhua qhov kev xav sab hauv
Yog thiab tsuas yog thaum twg, lub teeb ci dhau los ntawm qhov nruab nrab denser mus rau qhov nruab nrab sib dua, lossis hauv lwm lo lus, los ntawm qhov nruab nrab nrog qhov ntsuas siab refractive (n1) mus rau qhov ntsuas qis qis (n2) nruab nrab (n1 > n2) thiab qhov xwm txheej lub kaum sab xis loj dua lub kaum sab xis tseem ceeb, ua rau tag nrho qhov kev xav ntawm qhov teeb meem hluav taws xob tsis dhau mus rau qhov sib zog nruab nrab. Ntawm no lub kaum sab xis tseem ceeb txhais tau tias yog qhov xwm txheej kaum, uas ua rau lub kaum sab xis ntawm 90 degrees. Lub tswv yim no yog siv hauv fiber ntau optics kom ncav cuag cov ntaub ntawv ntawm lub sijhawm luv luv thiab kom tau txais cov pob zeb ci ntsa iab, raug txiav kom siv qhov tshwm sim no.
Qhov txawv ntawm Reflection thiab Total Internal Reflection yog dab tsi?
· Kev xav thiab tag nrho cov kev xav sab hauv yog lub cev ntawm cov nthwv dej. Kev xav tau tshwm sim hauv txhua yam nthwv dej, tab sis tag nrho cov kev xav sab hauv tsuas yog tshwm sim nrog lub teeb ci.
· Tag nrho cov kev xav sab hauv tshwm sim thaum lub teeb dhau los ntawm qhov nruab nrab denser mus rau qhov nruab nrab sib dua. Tab sis rau kev xav tsis muaj qhov txwv kom xav txog.
· Hauv kev xav ntawm nthwv dej, ob qho tib si kev xav thiab kev cuam tshuam (dhau los ntawm qhov nruab nrab thib ob) nthwv dej tshwm sim. Tab sis nyob rau hauv tag nrho cov kev xav sab hauv, tsuas yog reflection ray tshwm sim.
· Nyob rau hauv tag nrho cov kev xav sab hauv, lub zog ntawm qhov teeb meem hluav taws xob thiab cov duab hluav taws xob yog sib npaug. Txawm li cas los xij, hauv kev xav nws tsis yog.
