Letter and the working principle of grating ruler

Common grating according to the physical principle is the principle of moire fringes for work. When the indicator on the grating lines and scale grating on the line at an angle to place the two grating ruler, inevitable meeting causes two grating ruler line crossing each other. Under the irradiation of the light source, the area near the intersection with black lines overlap, so the shading area of the smallest, the weakest light effect, cumulative effect makes the area appear bright band. Instead, from the intersection point of distant regions, because of the two grating opaque black line overlap becomes less and less, opaque area becomes larger, the shading area gradually become larger, so that the light blocking effect becomes stronger, less light energy through this region through the grating, make this region appears dark band, so they formed what we see Moore stripe.

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