Albedo vs Reflectance
Albedo thiab kev xav tau yog ob lub ntsiab lus tseem ceeb uas tau tham txog hauv kev xav ntawm electromagnetic nthwv dej. Ob lub ntsiab lus no muaj qhov tseem ceeb hauv cov haujlwm xws li astronomy, chemistry, geology thiab biology. Nws yog ib qho tseem ceeb kom muaj kev nkag siab meej ntawm ob lub ntsiab lus no kom ua tau zoo hauv cov haujlwm no. Nyob rau hauv tsab xov xwm no, peb yuav tham txog dab tsi albedo thiab reflectance yog, cov ntsiab lus ntawm albedo thiab reflectance, lawv cov ntawv thov nyob rau hauv cov hauj lwm, lawv zoo sib xws, thiab thaum kawg qhov txawv ntawm albedo thiab reflectance.
Kev xav yog dab tsi?
Reflectance txhais tau tias yog feem ntawm qhov xwm txheej electromagnetic zog uas tau cuam tshuam ntawm qhov sib cuam tshuam. Qhov no yuav tsum tsis txhob totaub nrog cov hluav taws xob uas cuam tshuam ntawm lub interface. Lo lus "reflection coefficient" piav txog qhov feem ntawm hluav taws xob teb uas tau cuam tshuam ntawm qhov cuam tshuam. Txawm li cas los xij, qhov "reflection coefficient" no tseem txuas nrog qhov cuam tshuam. Qhov coefficient ntawm kev xav no tuaj yeem txiav txim siab siv Fresnel qhov sib npaug. Nws tuaj yeem coj tus nqi tiag lossis nyuaj. Lub reflectance ntawm ib tug nto yog qhov loj ntawm lub square ntawm lub reflection coefficient. Lub reflectance ntawm ib tug nto yog ib txwm zoo. Yog hais tias qhov kev xav ntawm ib yam khoom yog xoom, nws txhais tau hais tias cov khoom tsis cuam tshuam ib qho ntawm cov hluav taws xob hluav taws xob, uas yog xwm txheej ntawm cov khoom. Tag nrho cov EM nthwv dej no tau nqus, thiab cov khoom tsis tuaj yeem pom tau siv txoj kev kho qhov muag lossis electromagnetic. Yog hais tias qhov kev xav ntawm ib yam khoom yog 100%, nws txhais tau hais tias cov khoom tsis nqus cov electromagnetic yoj ntog ntawm cov khoom. Xws li cov khoom yog zoo meej reflectors. Reflectance thiab reflectivity yog ob lub ntsiab lus sib txawv; reflectivity yog ib yam khoom ntawm cov khoom tuab. Nws tuaj yeem txhais tau tias tus nqi siab tshaj qhov kev xav tau tuaj yeem tau txais. Raws li cov khoom tau thicker, tus nqi reflectance ua ntau ywj siab ntawm qhov chaw ntawm lub nraub qaum. Qhov kev xav ntawm ib yam khoom nrog lub thickness loj tsuas yog nyob ntawm qhov xwm txheej ntawm lub interface.
Albedo yog dab tsi?
Albedo txhais tau tias yog qhov piv ntawm cov hluav taws xob cuam tshuam los ntawm qhov chaw mus rau qhov xwm txheej hluav taws xob rau nws. Lub albedo ntawm ib yam khoom nyob ntawm qhov zaus ntawm qhov xwm txheej nthwv dej. Qhov no kuj tseem hu ua reflection coefficient thiab diffuse reflectivity. Lub albedo ntawm ib yam khoom yog ib yam khoom ntawm qhov chaw. Thaum lub albedo ntawm ib yam khoom yog muab tsis muaj zaus, nws feem ntau txhais tau hais tias lub albedo ntawm qhov pom ntau yog qhov nruab nrab kom tau txais tus nqi. Albedo yog ib qho khoom tseem ceeb heev hauv astronomy. Lub albedo qhov tseem ceeb ntawm cov khoom nyob rau hauv lub hnub ci system txiav txim lawv visibility. Qhov no yog vim lawv tsis tsim muaj zog. Qhov peb pom yog lub teeb pom kev los ntawm lub hnub.
Dab tsi yog qhov txawv ntawm albedo thiab reflectance?
• Reflectance yog txhais rau qhov sib cuam tshuam ntawm ob lub xov xwm thaum albedo tau txhais rau qhov chaw.
• Kev cuam tshuam nyob ntawm qhov nruab nrab ntawm qhov xwm txheej nthwv dej, tab sis albedo tsis nyob ntawm qhov nruab nrab ntawm qhov xwm txheej ray.
• Lub reflectance yuav nyob ntawm qhov tob ntawm qhov chaw tab sis albedo tsis.
