Qhov sib txawv tseem ceeb ntawm qhov kev xav tsis tu ncua thiab kev cuam tshuam yog qhov kev xav tsis tu ncua, qhov teeb meem hluav taws xob (txoj kab hluav taws xob poob rau ntawm qhov chaw) thiab lub teeb pom kev zoo (txoj kab hluav taws xob rov qab los tom qab tawm tsam qhov cuam tshuam ntawm qhov chaw) muaj tib lub kaum ntse ntse. ntawm kev xav, whereas, nyob rau hauv diffuse reflection, muaj ntau tawg ri niab reflecting rays muaj sib txawv reflection angles.
Reflection yog daim duab peb tuaj yeem pom ntawm daim iav lossis qhov ci ntsa iab. Muaj ob hom kev xav raws li kev xav tsis tu ncua lossis kev xav txog kev xav thiab nthuav dav, nyob ntawm lub kaum sab xis ntawm lub teeb pom kev zoo.
Kev xav tsis tu ncua yog dab tsi?
Kev xav tsis tu ncua lossis kev xav txog qhov xav tau yog hais txog daim iav zoo li kev xav ntawm nthwv dej ntawm qhov chaw. Ib qho piv txwv ntawm xws li nthwv dej yog lub teeb. Muaj ib txoj cai ntawm kev xav, uas piav qhia tias lub teeb pom kev ntawm lub teeb feem ntau tshwm sim los ntawm qhov pom ntawm qhov chaw ntawm tib lub kaum sab xis raws li qhov xwm txheej ntawm lub teeb pom kev poob ntawm daim iav. Tab sis qhov teeb meem hluav taws xob thiab cov hluav taws xob cuam tshuam yog nyob rau sab nraud ntawm lub dav hlau ib txwm muaj, uas yog lub dav hlau uas tsim los ntawm qhov teeb meem hluav taws xob thiab cuam tshuam hluav taws xob.
Lub tswv yim ntawm kev xav tau thawj zaug los ntawm Hero of Alexander hauv AD c.10-70. Kev xav tsis tu ncua txawv ntawm diffuse reflection vim hais tias, nyob rau hauv diffuse reflection, lub reflected rays zoo li tawg tawm ntawm qhov chaw.
Raws li txoj cai ntawm kev xav, lub teeb uas ntsib ib thaj tsam cuam tshuam los ntawm kev ua haujlwm kho qhov muag thiab hluav taws xob ntawm cov khoom siv hluav taws xob hluav taws xob.
Daim duab 02: Kev xav pom zoo los ntawm cov hlau ntub dej
Thaum lub sijhawm xav tsis tu ncua, lub teeb pom kev thiab tuaj txog ntawm tib lub kaum sab xis. Peb tuaj yeem sim ua kom pom qhov sib txawv ntawm qhov kev xav tsis tu ncua thiab tsis siv qhov kev xav los ntawm txheej txheej nrog glossy xim thiab matte xim; cov xim matte feem ntau qhia tau hais tias tus cwj pwm xav txog kev xav, thaum lub ntsej muag nrog cov xim glossy feem ntau qhia pom qhov txawv txav.
Qee yam piv txwv ntawm kev xav tsis tu ncua muaj xws li pom lub teeb ntawm daim iav, xov tooj cua nthwv dej, thiab microwaves ntawm cov khoom ya, iav acoustic (reflects suab) thiab atomic mirrors (reflect neutral atoms).
Diffuse Reflection yog dab tsi?
Diffuse reflection yog hais txog qhov kev xav ntawm lub teeb lossis lwm yam nthwv dej los ntawm qhov chaw los ntawm cov nyhuv tawg. Nyob rau hauv lwm yam lus, nyob rau hauv diffuse reflection, lub nthwv dej yog reflected los ntawm ib tug saum npoo nyob rau hauv xws li ib tug txoj kev uas qhov teeb meem rays yog tawg nyob rau hauv ntau lub ces kaum. Nyob rau hauv sib piv, nyob rau hauv tsis tu ncua kev xav, muaj ib lub kaum sab xis ntawm qhov teeb meem rays reflected.
Nyob rau hauv cov txheej txheem diffuse zoo tagnrho, peb tuaj yeem soj ntsuam Lambertian kev xav (muaj qhov sib npaug ntawm qhov pom ntawm txhua qhov kev qhia uas tau dag ntawm ib nrab-qhov chaw uas nyob ib sab ntawm qhov chaw.
Daim duab 03: Tsis tu ncua thiab Diffuse Reflection los ntawm Glossy Surface
Qee yam piv txwv ntawm cov ntaub ntawv uas tuaj yeem ua rau muaj kev cuam tshuam muaj xws li plaster (non-absorbing hmoov), ntawv (ua los ntawm fibers), thiab dawb marble (polycrystalline). Feem ntau, kev xav tsis tu ncua tsis tshwm sim hauv cov ntaub ntawv no vim qhov roughness ntawm qhov chaw. Ib yam li ntawd, ib qho chaw tiaj tus tsis ib txwm muab kev xav txog kev xav. Qhov no yog vim qhov kev xav ntawm kev xav tsis tau tshwm sim ntawm qhov chaw. Cov chaw tawg pleb tshwm sim hauv qab qhov chaw.
Qhov txawv ntawm qhov tsis tu ncua thiab qhov txawv txav yog dab tsi?
Reflection yog daim duab uas peb tuaj yeem pom ntawm daim iav lossis qhov ci ntsa iab. Muaj ob hom kev xav raws li kev xav tsis tu ncua thiab diffuse reflection, nyob ntawm lub kaum sab xis ntawm lub teeb pom kev zoo. Qhov sib txawv tseem ceeb ntawm kev xav tsis tu ncua thiab diffuse yog tias, nyob rau hauv kev xav tsis tu ncua, qhov teeb meem hluav taws xob thiab lub teeb pom kev zoo muaj tib lub kaum sab xis ntawm kev xav, whereas, nyob rau hauv diffuse reflection, muaj ntau qhov sib txawv ntawm cov hluav taws xob muaj qhov sib txawv ntawm qhov sib txawv.
Cov infographic hauv qab no teev qhov sib txawv ntawm qhov tsis tu ncua thiab nthuav dav hauv daim ntawv teev npe rau kev sib piv ntawm ib sab
Summary – Regular vs Diffuse Reflection
Kev xav tsis tu ncua yog hais txog daim iav zoo li qhov kev xav ntawm cov nthwv dej ntawm qhov chaw, thaum diffuse reflection yog hais txog qhov kev xav ntawm lub teeb lossis lwm yam nthwv dej ntawm qhov chaw los ntawm cov nyhuv tawg. Qhov sib txawv tseem ceeb ntawm qhov kev xav tsis tu ncua thiab diffuse yog tias nyob rau hauv kev xav tsis tu ncua, qhov teeb meem hluav taws xob thiab lub teeb pom kev zoo muaj tib lub kaum sab xis ntawm kev xav, whereas, nyob rau hauv diffuse reflection, muaj ntau qhov sib txawv ntawm cov hluav taws xob muaj qhov sib txawv ntawm qhov sib txawv.
