各位版友大家好,
S1&mY'c 我是剛註冊論壇不久的新手,
Zf |%t 很高興找到這個論壇能和大家交流,還希望大家多多指教。
bR6.Xdt.n 1HG~}E 看到一些版友的文章對
Fred的power單位有疑問,
{wRs V=* 我查了一下資料,提出以下見解,
7.$0LN/a!Z );V6YE Fred 在power 並沒有設定單位,其單位可以代表光度學的流明或是輻度學的瓦特,
zME75;{ 主要是依
光源設定的光譜是以光度為依據或是輻度學為依據,
u?Jw) ` 在orsam所提供之ray file 之說明文件可以找到這兩種光譜,
o ^L3Xiv 輸入的光譜會影響照度分析、強度分析和color image結果,
g4( B=G\j 如果輸入的光譜是以輻度為依據,
/=A?O\B7 那照度分析、強度分析所呈現的是輻度的結果,
Qx|m{1~- 而color image 呈現的是光度的結果,
eD/O)X 當把光譜設定在不可見光的範圍,可以看到照度分析和強度分析皆有值出現,
jXkz,]Iy 而color image為全暗無值,因為不可見光之視感度為0。
Io *`hA] 如果輸入的光譜是以光度為依據,
BB5(=n+ 那照度分析、強度分析所呈現的是光度的結果,
0&2(1 而color image之結果應該會不正確,因為會乘了兩次視感度,
I.TdYSB 所代入的光譜乘了一次,color image 分析又會乘一次,
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6._Z(D Fred不能自動分辨輸入的是流明還是瓦特。
$Zp\^cIE+ 所以要以光度為單位的照度分析、強度分析、color image分析,
1GKd*z 要分別用光度光譜和輻度光譜做兩次模擬,
:zZK%}G< ~~k_A|& 6Y0k}+j|>E 以上推論不知是否正確?
{^2``NYM_ Mfe/(tlI 還希望高手指正或補充。
fEE[huG NL
3ri7n f4)fa yAVp 參考:
ya3A^&: FRED is a unitless program. If you are entering flux it can be entered in either Watts or Lumens. None of the plots assume watts or lumens but give unitless information. Please note that you can use the plotting program to add this information on the axes using the last option when right clicking on any plot, advanced. Go to the axes tab to change this.
6= s!~ 9F)+p7VJq But calculations in lumens correct only for single wavelength. If I use spectrum with given band I must consider eye response (photopic curve), otherwise calculations was incolrrect. For example two wave with 1 watt have different lumens. And if I specify total watts for spectrum - result was correct. If I specify total lumens for spectrum - result was incorrect.
FjqoO. Naturally enough use scripts, but for software like Fred, I think, must be bult in this (LightTools and OptisWorks has this ability).
#L5H-6nz 4Tgy2[D?q 以上英文出處:
_Q,`Qn@|BD http://www.photonengr.com/fred/phpBB3/viewtopic.php?f=2&t=783&p=1231&hilit=lumens C-lv=FJEk/