Izindlela ezine zokubala zokukhanya kwe-LED
Okokuqala, i-flux ekhanyayo
I-flux ekhanyayo isho inani lokukhanya elikhishwa umthombo wokukhanya ngesikhathi seyunithi ngayinye, okungukuthi, ingxenye yamandla akhazimulayo amandla akhazimulayo angabonwa ngeso lomuntu. Ilingana nomkhiqizo wamandla akhazimulayo ebhendi ethile ngesikhathi seyunithi kanye nokubonakala okuhlobene kwalelo bhendi. Njengoba ukubonakala okuhlobene kwamaza ahlukene okukhanya ngeso lomuntu kuhlukile, ukukhanya okukhanyayo akulingani lapho amandla emisebe yamaza ahlukene okukhanya elingana. Uphawu lokugeleza okukhanyayo ngu-Φ, iyunithi i-lumens (Lm)
Ngokuvumelana ne-spectral radiant flux Φ(λ), ifomula ye-flux ekhanyayo ingatholakala:
Φ=Km■Φ(λ)gV(λ)dλ
Kufomula, i-V(λ)—ukusebenza kahle kokukhanya kwe-spectral; Km—inani eliphezulu lokusebenza kwe-spectral optical kwemisebe, kumayunithi we-Lm/W. Inani le-Km lanqunywa Ikhomishana ye-International Metrology ngo-1977 ukuze libe ngu-683 Lm/W (λm = 555 nm).
Okwesibili, amandla okukhanya
Amandla okukhanya asho amandla okukhanya adlula endaweni yeyunithi ngesikhathi seyunithi ngayinye. Amandla alingana nemvamisa, okuyisamba sokuqina kwawo (okungukuthi, okubalulekile). Kungase futhi kuqondwe ukuthi amandla akhanyayo I omthombo wokukhanya endaweni ethile umthombo wokukhanya. I-quotient ye-flux ekhanyayo dΦ edluliswa ku-elementi ye-engeli eqinile kuleli cala ehlukaniswe isici se-engeli eqinile dΩ
Iyunithi yokuqina okukhanyayo yi-candela (cd), 1 cd = 1 Lm / 1 sr. Isamba sokukhanya kuzo zonke izinhlangothi zesikhala ukugeleza okukhanyayo.
Okwesithathu, ukukhanya
Enqubweni yokuhlola ukukhanya kwama-chips e-LED nokuhlola ukuphepha kwemisebe yokukhanya ye-LED, izindlela zokuthwebula zivame ukusetshenziswa, futhi imaging ye-microchip ingasetshenziselwa ukuhlolwa kwe-chip. Ukukhanya kungukukhanya L endaweni ethile endaweni ekhipha ukukhanya yomthombo wokukhanya, okuyi-quotient yokuqina kokukhanya kwesici sobuso dS ngendlela enikeziwe ehlukaniswe ngendawo yombhalo wesici sobuso indiza perpendicular isiqondiso esinikeziwe.
Iyunithi yokukhanya yi-candela ngemitha yesikwele (cd/m2). Uma indawo ephumayo yokukhanya incike ngakundlela yokulinganisa, bese kuba ngu-cos θ = 1.
Okwesine, ukukhanya
Ukukhanya izinga into ekhanyiswa ngalo, evezwa ngokuya ngokugeleza okukhanyayo okutholwe endaweni yeyunithi ngayinye. Ukukhanya kuhlobene nokuma komthombo wokukhanya, indawo ekhanyisiwe kanye nomthombo wokukhanya emkhathini, futhi usayizi ulingana namandla okukhanya omthombo wokukhanya kanye ne-engeli yesigameko yokukhanya, futhi ngokuphambene ngokulingana nesikwele ibanga ukusuka emthonjeni wokukhanya ukuya endaweni ekhanyisiwe. I-illuminance E endaweni engaphezulu iyi-quotient yesigameko esikhanyayo se-flux dΦ kuphaneli okuhlanganisa nephuzu elihlukaniswe ngendawo yephaneli engu-dS.
Iyunithi iyilux (LX), 1LX = 1Lm/m2.