
Stray Light Control for Molded Optics 111
© 2011 by Taylor & Francis Group, LLC
• The stray light source is the sun; therefore, the radiance of the stray
light source L is equal to the blackbody integral of a T = 5,900 K
blackbody over the visible waveband (0.4 to 0.7 μm), which is equal
to 2.2316E21 photons/s-cm
2
-sr, and the projected solid angle of the
stray light source Ω is equal to a right angle cone (Equation 3.10) that
subtends 32 arc seconds, or Ω = 6.8052E-5 sr.
• The scatter angle θ
s
is roughly equal to zero (i.e., the scattered rays
travel parallel to the optic axis).
• The transmittance of each optical surface is assumed to ...