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Optics
Window Placement
The window should be positioned properly to let the illumination and aiming beams pass through as much
as possible and no reflections back into the engine (reflections can degrade the reading performance).
The window should be mounted close to the front of the engine (parallel) and the window should be as thin
as possible.
If the window is required to be in a tilted position, the requirements above should be met and tilt angle
should ensure no reflections back into the lens.
Window Material and Color
CIS's responsiveness (mainly to wavelengths of white light）should be taken into consideration when
choosing window material and color, in order to achieve the possible highest spectral transmission, lowest
haze level and homogeneous refractive index. It is suggested to use PMMA or optical glass with spectral
transmittance of white light over 90% and haze less than 1%. Whether to use an anti-reflection coating or
not depends on the material and application needs.
Scratch Resistance and Coating
Scratch on the window can greatly reduce engine performance. It is suggested to use abrasion resistant
window material or coating.
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