Lab 10

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Lab 10
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Solid angle a three-dimensional angle sr,
there are 4p in a sphere.
d Osin (?)d ?d ø integration in
spherical coordinate Approximate equation
OArea/Distance2 Projected area is the planar
area that is seen from the observation
point. Area (projected)Area cos(?) Throughput
(entendue) A O Radiance L W/(m2 sr) Radiance
is conserved in a lossless medium When the index
is not unity, the basic throughput n2A O and the
basic radiance L/n2 are invariant. (the optical
system we use can not change the radiance, once
we account for index of refraction effects ) n2A
O p 2?2
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FLAO Lambertian radiance from a lambertian
surface is independent of view angle II0 cos
(?) M p L Cosine Law Irradiance on a surface
is proportional to the cosine of the angle
between the normal to the surface and the
incident radiance. EE0cos(?) 1/R2 law for a
point source the irradiance from a point source
is inverse proportional to the square of the
distance from the source. Lens falloff law E0
cos (?)4 for extend source (for small extended
source) Cosine fall-off (point source) E0 cos
(?)3
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