High-accuracy translation-rotation encoder with two gratings in a Littrow mount.
A new type of translation-rotation encoder that makes use of two identical transparent dielectric gratings lighted in a -1-order Littrow mount is proposed. The correct choice of the wavelength-to-groove-spacing ratio produces only two transmitted beams, which interfere with the highest possible visibility in a large range of experimental conditions. Thus this mounting permits high-accuracy encoders to be produced by the use of cheap photoresist or plastic gratings and opens the way to industrial applications in high-precision mechanics, information processing, etc.
Nevièvre
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Laboratoire d'Optique Electromagnétique, Unité Propre de Recherche de l'Enseignement SupérieurAssociée, Faculté des Sciences de St-Jérôme, Case 262, Centre National de la Recherche Scientifique 6079, 13397 Marseille Cedex20, France.
Popov
E
E
Bojhkov
B
B
Tsonev
L
L
Tonchev
S
S