给个英文的.个人理解可能会有点出入.基本上是这个意思. 4f_ZY5=
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric d m/ -}
units, a luminous intensity plot is in units of candelas (lumens per steradian). In Vu_7uSp,)
radiometric units, an intensity plot is in units of watts per steradian. Candela plots \<0G
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are commonly used in the design of illumination systems, especially those used in bW,BhUb,|
the far field. LZ= wz.'u
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface jV(xYA3
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” xg*\j)_}
the model and “go off to infinity.” Exiting rays are the collection of ray segments 7UeE(=Hr5
following the intersection point of a ray at a surface. Due to ray splitting, several Fjb4BdZ P
ray segments may contribute to the candela data for each incident ray. Incident - N /8Ho
rays are the collection of ray segments which intersect the selected surface. No /h.:br?M#P
surface selection is required for Missed rays but one is necessary for Exiting and =%:n0S0C"
Incident rays. r_qncy,F
The candela plots represent flux versus angle and can be smoothed using the B;Q`v KY
Candela Options dialog box. The iso-candela plots can be presented as false = !I8vQ>
color maps or contour plots. The distribution plots are graphs of cross-sectional (1saof *p%
curves through the candela distribution.
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The orientation of the candela plots is determined by the Normal Vector and the r_!{!i3B
Up Vector, as specified in the Analysis|Candela Options dialog box. The MbT
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normal vector specifies the axis of the candela plot and the up vector specifies KNO*)\
“which way is up.”
