DocID026155 Rev 1

5/10

AN4466

Optical filtering

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Each time the light passes through the glass, it will be scattered to a certain extent. The

amount of scattering will be determined by several factors including the roughness and the

IR cut off position. The wavelength of the cut off between visible and IR should be designed

to be nearer 650nm than 840nm.

Figure 3. Examples of scattering

Example of high scattering

Example of low scattering