给个英文的.个人理解可能会有点出入.基本上是这个意思. y@]_ +2Vo
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric agkA}O
units, a luminous intensity plot is in units of candelas (lumens per steradian). In U6=..K!q
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ]5BX :%
are commonly used in the design of illumination systems, especially those used in S (QpM.9*
the far field. |
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Candela data can be collected from ray sets of Missed rays, rays Exiting a surface M]<?k]_p
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” |\w=u6jX
the model and “go off to infinity.” Exiting rays are the collection of ray segments M=.:,wRm
following the intersection point of a ray at a surface. Due to ray splitting, several =nz}XH%=
ray segments may contribute to the candela data for each incident ray. Incident g"Ljm7
rays are the collection of ray segments which intersect the selected surface. No ckV`OaRw4
surface selection is required for Missed rays but one is necessary for Exiting and Ku WWUjCE
Incident rays. z
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The candela plots represent flux versus angle and can be smoothed using the
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Candela Options dialog box. The iso-candela plots can be presented as false >oea{u
color maps or contour plots. The distribution plots are graphs of cross-sectional yphS'AG
curves through the candela distribution. )i q-yj O6
The orientation of the candela plots is determined by the Normal Vector and the f @8mS
Up Vector, as specified in the Analysis|Candela Options dialog box. The #u2J;9P
normal vector specifies the axis of the candela plot and the up vector specifies ]FD'5p{
“which way is up.”
