算光效率 ，可以尝试使用归一化啊。
'LW~_ \
System Transmittance .6HHUy
Suppose you need to calculate the system transmittance of an optical system. *pj ^d><
You would probably use the grid raytrace option, and the emitted flux is equal to f{+n$ Cos
the sum of the flux in all the emitted rays. When you display an irradiance map, mGP&NOR0^y
the system transmittance is equal to the total flux, displayed at the bottom of the U]}f]GK
irradiance map window, divided by the emitted flux. To get the system sX[k}=HCK
transmittance, check the Normalize to emitted flux box and press the Apply bBg=X}9
button. The map will be redisplayed, and the Normalized Flux value will be equal |kK_B
:K
to the system transmittance.
