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This vernier scale improves the reading accuracy of the relative position of two elements and can also be used in particular for optical transmission systems whose scales may overlap.
English (United States)
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This vernier scale improves the reading accuracy of the relative position of
two elements and can also be used in particular for optical transmission systems
whose scales may overlap.
The two scale elements A and B are designed in the form of combs with
meshing tabs, period length a of scale element A differing slightly from period
length b of scale element B, e.g., by 1/20 or 1/30. Width c of the individual tabs
is the same for both scale elements, amounting to about 1/4 of the period length.
Scale element A has a center mark CA, and scale element B a center mark
CB. In addition, scale element B is provided with additional marks D denoting
relative shifts by whole scale units, in accordance with period length b. Marks D
can simultaneously be used to denote the respective relative shift between scale
elements A and B.
For reading, that tab of a scale element is determined which protrudes
symmetrically into the pocket of another scale element, i.e., which is equidistant
from the adjacent tabs. In Fig. 1, the tab concerned is the center tab of scale
element A, corresponding to setting 0, center marks CA and CB being aligned to
each other in this case. In Fig. 2, the tab of scale element B in position +0.5
symmetrically protrudes into the associated pocket of scale element A,
corresponding to setting +0.5. In Fig. 3, the tab of scale element B in position 01.5 symmetrically protrudes into the associated pocket of scale element A,
corresponding to setti...