A typical lens consists of several refractive elements housed together in a housing.
The housing has several functions:
These functions are performed using spacers and internal steps in the housing. For thermal correction these spacers might be made of dissimilar materials
A typical lens will have a FOV of interest. The incident light in the FOV is imaged by the lens on a focal plane or transmitted to additional optics.
Unfortunately it is generally not possible to entirely prevent penetration into the lens of light from outside of the FOV of interest.
If this “stray light” is allowed to reach the focal plane the system signal-to-noise ratio will be lowered and the mission effectiveness will be impacted negatively.
The methodology used to minimize this problem to a negligible level is as follows:
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