تشعشع4 - نسخه‌ی قابل چاپ +- تالار گفتگوی کیش تک/ kishtech forum (http://forum.kishtech.ir) +-- انجمن: پردیس فناوری کیش (http://forum.kishtech.ir/forumdisplay.php?fid=1) +--- انجمن: مهندسی مکانیک (http://forum.kishtech.ir/forumdisplay.php?fid=205) +--- موضوع: تشعشع4 (/showthread.php?tid=43925)

تشعشع4 - فاطمه رمضانی - 15-08-2020 شدت تشعشع فرودیویرایش تشعشع فرودی بر یک سطح ممکن است ناشی از گسیل و بازتاب تشعشع از سطوح دیگر باشد. تشعشع فرودی نیز مانند تشعشع گسیل شده دارای توزیع طیفی و جهتی است (یعنی به طول موج و جهت تشعشع بستگی دارد) در اینجا می‌خواهیم شار تشعشعی را بر حسب شدت طیفی بیان کنیم. شار تشعشع فرودی تشعشع از تمام جهت‌ها را در نظر می‌گیریم. شار تشعشع ورودی طیفی G λ {\displaystyle {{G}_{\lambda }}} با واحد w m 2 . μ m {\displaystyle {\frac {w}{{{m}^{2}}.\mu m}}} عبارت است از آهنگ تشعشع با طول موج λ {\displaystyle \lambda } که در بازه d λ {\displaystyle d\lambda } (حول λ {\displaystyle \lambda } ) بر مساحت واحد سطح فرود می‌آید. با توجه به این تعریف، G λ = ∫ 0 2 π ∫ 0 π 2 I λ , i ( λ , θ , ϕ ) cos ⁡ θ sin ⁡ θ d θ d ϕ {\displaystyle {{G}_{\lambda }}=\int _{0}^{2\pi }{\int _{0}^{\frac {\pi }{2}}{{{I}_{\lambda ,i}}\left(\lambda ,\theta ,\phi \right)}}\cos \theta \sin \theta d\theta d\phi } شار تشعشع فرودی کل G {\displaystyle G} با واحد w m 2 {\displaystyle {\frac {w}{{m}^{2}}}} آهنگ فرود تشعشع بر مساحت واحد سطح از تمام جهت‌ها و در تمام طول موج‌ها را نشان می‌دهد. رابطه آن چنین است: G = ∫ 0 ∞ G λ ( λ ) d λ {\displaystyle G=\int _{0}^{\infty }{{{G}_{\lambda }}\left(\lambda \right)}d\lambda } با توجه معادله بالا: G = ∫ 0 ∞ ∫ 0 2 π ∫ 0 π 2 I λ , i ( λ , θ , ϕ ) cos ⁡ θ sin ⁡ θ d θ d ϕ d λ {\displaystyle G=\int _{0}^{\infty }{\int _{0}^{2\pi }{\int _{0}^{\frac {\pi }{2}}{{{I}_{\lambda ,i}}\left(\lambda ,\theta ,\phi \right)}}}\cos \theta \sin \theta d\theta d\phi d\lambda } RE: تشعشع4 - wrynn - 07-11-2023 audiobookkeeper.rucottagenet.rueyesvision.rueyesvisions.comfactoringfee.rufilmzones.rugadwall.rugaffertape.rugageboard.rugagrule.rugallduct.rugalvanometric.rugangforeman.rugangwayplatform.rugarbagechute.rugardeningleave.rugascautery.rugashbucket.rugasreturn.rugatedsweep.rugaugemodel.rugaussianfilter.rugearpitchdiameter.ru 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