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Both types of ENCODERS are rather insensitive to
moisture and dirt, because a number of windows/bars are looked at
at the same time, the average result is the output. Ex: if 10 window/bar
combinations are looked at, the incidence of 1 missing window/bar
is rather limited.
As one can see in the first picture, the dark area
is the photosensor array which is 2.0mm wide and 0.15mm high. When
comparing this with a CODESTRIP at 180LPI as can be seen in the
second image,one can deduct that there are about 14 window/bar pairs
being looked at at the same time in this case.
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