Yorug'lik o'lchagichning yorqinligi va yorug'lik birliklari o'rtasidagi konversiya munosabatini tushuntirish
1) Yorug'lik manbai ob'ektni yoritganda, biz yorug'lik manbai tomonidan chiqarilgan (Luminance? D yorqinligi) yoki ob'ekt tomonidan aks ettirilgan (Yorqinlik? D yorug'lik) o'lchashimiz mumkin.
(2) Yoritish ob'ektning aks ettirish xususiyatlariga bog'liq. U fotosuratga juda o'xshaydi, u faqat aks ettirilgan yorug'likni o'lchaydi. Uning universal birligi lyuksdir.
(3) Biroq, EL chiroq yorug'lik manbai hisoblanadi: u yorqinlik birliklarida ifodalanishi kerak, ya'ni fL (oyoq Lambert) yoki cd / m2, shuningdek, "nits" deb ham ataladi. Ba'zi muhandislar fL dan foydalanishni afzal ko'rishadi, xalqaro standartlar tashkilotlari odatda nitlardan foydalanadilar. Nitslarni fL ga aylantirish formulasi: 1nits × 0.2919=1fL; Va 1fL × 3.426=1nits [Eslatma; bu omillar pi (p) va m2/ft2 (0.0929) dan olingan.
(4) Shubhasiz, lyuksdan foydalanish noto'g'ri birlikdir va uni lyuksdan boshqa birliklarga aylantirib bo'lmaydi.
Yorug'lik oqimi
Yorug'lik oqimi: yorug'lik manbai tomonidan chiqariladigan yorug'lik energiyasining tezligi yoki yorug'lik oqimining tezligi (Flowrate), yorug'lik manbasining yorug'lik qobiliyatini ko'rsatadigan asosiy miqdor bo'lib, lumenlarda o'lchanadi. Misol uchun, 100 vatt (Vt) lampochka 1750 lm ishlab chiqarishi mumkin, 40 Vt sovuq oq floresan naycha esa 3150 lm yorug'lik oqimini ishlab chiqarishi mumkin. Ta'rifga ko'ra, 1lm - 1 sferik graduslik qattiq burchakda 1cd yorug'lik intensivligi (l) bo'lgan bir xil nuqtali yorug'lik manbai tomonidan chiqariladigan yorug'lik oqimi.
Yorug'lik intensivligi
Luminous intensity (Candlepower): Luminous intensity, abbreviated as luminosity, refers to the luminous flux emitted from a solid angle of a light source (unit: sr), which is the density distribution of the luminous flux emitted by the light source or lighting fixture in a selected direction in space, in candlelight (cd). A light source with a luminous intensity of 1cd can emit a luminous flux of 12.57lm. Luminance: The density of the luminous flux received on the illuminated plane, measured by the luminous flux per unit area. A light flux of 1lm is evenly distributed on a surface of 1 square meter (m2), resulting in an illuminance of 1 lux (environmental technology>illuminometr); 1 lm yorug'lik oqimi 1 kvadrat fut (ft2) sirtga tushadi va uning yorug'lik qiymati 1 fut sham (fc) dir.
