It works common gratings are formed in accordance with the principle of work on physical moire. When the instructions and lined lined grating scale grating at an angle to place when two encoders, will definitely lead lined grating on the two cross each other. Under the irradiation of the light source, near the intersection of the small area as the black-lined overlap, thus shading the smallest and weakest of the light blocking effect, the cumulative effect of light makes the area appear bright band. On the contrary, far from the intersection of the region, due to two overlapping portions of the grating opaque black lined becoming less and less opaque region area becomes larger, the light-shielding area becomes larger, so that the light-blocking effect becomes stronger, only less light through this region through the grating, so that this region appears dark bands, which will form we see moire.
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