Yintoni iRelative Illuminance? Uyichaza njani iRelative Illuminance Curve Graph?

1.Yintoni ukukhanya okulinganiselweyo?

Imiphetho yento ibonakala imnyama ngokubonakalayo; ngaba oku kungaphuculwa? Namhlanje siza kujonga le parameter—ukukhanya okuthelekisekayo.

Inkcazo: Ukukhanya kukukhanya okubonakala kwinto okanye kumphezulu xa kukhanyiswa ngumthombo wokukhanya.

Ukukhanya okungqameneyo kubhekisa kumlinganiselo wokukhanya okusemaphethelweni ebala lokujonga nokukhanya okusembindini, okubonakaliswa njengepesenti. Yipharamitha echaza into ebonakalayo ebangelwa yinxalenye yokukhanya engena kwilensi evalekileyo okanye encitshisiweyo. Kuyilo lokukhanya, i-curve yokukhanya engqameneyo inika umfanekiso obonakalayo wokukhanya kwiindawo ezahlukeneyo kwicandelo lokujonga ngokungqamene neziko.

2.Ziziphi izinto ezichaphazela ukukhanya okuthelekisekayo?

(1)Isinepamandla ecUmthetho we-osine

Ukukhanya okusemaphethelweni ebala lokujonga kuncipha ngokulinganayo, kwaye oku kunxulumene namandla esine e-cosine ye-engile yokujonga. Amandla esine omthetho we-cosine ngumgaqo obalulekileyo ochaza ukuncitshiswa kokukhanya kwii-engile ezahlukeneyo, kwaye kusebenza ngakumbi kuhlalutyo lweempawu zemitha yemithombo yamanqaku okanye imithombo yokukhanya emincinci phantsi kweemeko ezithile.

Xa ukukhanya okuvela kumthombo wenqaku kwenzeka kumphezulu nge-engile θ, amandla (okanye ukukhanya) afunyanwa ngulo mphezulu alingana ne-cos⁴θ, oko kukuthi, I(θ) = I(0)·cos⁴θ. Apho:

I(0) bubunzulu bokukhanya xa umthombo wokukhanya usenzeka ngokuthe nkqo (θ=0°);

I-θ yi-engile ephakathi kwe-incident light ray kunye nomphezulu oqhelekileyo;

I(θ) bubungakanani bokukhanya kwi-engile θ.

Le fomula ichaza isizathu sokuba kubekho ubude obufutshane be-focalIilensi ze-FAzibonisa ukwehla okukhulu kokukhanya emaphethelweni. Ngenxa yokuba iilensi ezimfutshane ze-focal length zihlala zinebala elikhulu lokujonga, kulula ukuqonda kwifomyula engentla ukuba imiphetho iya kuba mnyama kakhulu, nokuba akukho mpembelelo yezinye izinto.

(2)Ukuzifihla

Eminye yemitha yokukhanya ivalwe yibharele yelensi okanye imiphetho yezinto zelensi, nto leyo ebangela ukuncipha kwamandla okukhanya afunyanwa kwimiphetho yesenzi sekhamera. Le nto ibizwa ngokuba yi-vignetting. I-animation engezantsi ibonisa ngokubonakalayo ukwakheka kwe-vignetting.

Ukwenziwa kwe-vignetting

Kwiilensi zokwenyani, ngenxa yokubakho kweziphithiphithi, ngamanye amaxesha kufuneka sivale ngokungekho mthethweni eminye yemitha yokukhanya eyingozi echaphazela ukwakheka komfanekiso. Oku kuphucula umgangatho womfanekiso, kodwa kwandisa ukuqaqamba kombala, nto leyo enciphisa ukukhanya okuthelekisekayo.

(3)Ukufakwa kwelensi kunye nobukhulu betshiphusi azihambelani

Xa umfanekiso ujikelezailensiincinci kunobukhulu obuphakathi kwe-sensor, imiphetho yebala lokujonga iya kuba mnyama okanye ibe mnyama ngokupheleleyo, apho ukukhanya okuthelekisekayo emaphethelweni kuya kuba yi-0%.

3.Uyitolika njani igrafu yejika lokukhanya elihambelanayo?

Imephu yokukhanya okunxulumeneyo

Kumfanekiso, inqaku 1: Iigophe ezinemibala eyahlukeneyo zimele ukukhanya okulinganiselweyo kwiindawo ezahlukeneyo zokuvula.

Kumfanekiso, inqaku lesi-2: I-axis ethe tye imele ubude bomfanekiso obahlukeneyo belensi (kusetyenziswa imo yokuphakama komfanekiso osisiqingatha, apho iziko lingu-0).

Kumfanekiso, inqaku lesi-3: I-axis ethe nkqo imele ixabiso lenani lokukhanya okunxulumeneyo kwiindawo ezintathu.

Kumfanekiso, inqaku lesi-4: Oku kumele igama okanye inombolo yomzobo waleilensi.

Inqaku lesi-6 kumfanekiso: I-lens illuminance curve ihlolwe kuluphi uluhlu lwe-wavelength?

Umzekelo:

Inqaku lesi-5 kumfanekiso: Ilinganiswe ngelensi ye-16mm kwi-F1.6 aperture kuluhlu lwamaza angama-860nm-900nm, ukukhanya okumalunga nokuphakama komfanekiso osisiqingatha malunga ne-3.5mm kumalunga ne-78% xa kuthelekiswa nombindi.

Iingcinga Zokugqibela:

Ngokusebenzisana neengcali eChuangAn, zombini uyilo kunye nokuveliswa kulawulwa ziinjineli ezinobuchule obuphezulu. Njengenxalenye yenkqubo yokuthenga, ummeli wenkampani unokuchaza ngokweenkcukacha ulwazi oluthile malunga nohlobo lwelensi ofuna ukuyithenga. Uthotho lweemveliso zelensi zikaChuangAn zisetyenziswa kwiintlobo ngeentlobo zezicelo, ukusuka ekujongeni, ukuskena, iidrone, iimoto ukuya kumakhaya akrelekrele, njl. IChuangAn ineentlobo ngeentlobo zeelensi ezigqityiweyo, ezinokutshintshwa okanye zenziwe ngokwezifiso ngokweemfuno zakho. Qhagamshelana nathi ngokukhawuleza.