4
Window Material and Color
Wavelengths of illumination and aiming beams and CIS
’s responsiveness (mainly to wavelengths of red
light
）
should be taken into consideration when choosing window material and color, 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 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 recommended to use abrasion
resistant window material or coating.
Window Size
The window must not block the field of view and should be sized to accommodate the aiming and
illumination envelopes shown below.
