Share Email Print
cover

Proceedings Paper

Interferometric translation-rotation encoder using diffraction gratings
Author(s): Michel Neviere; Evgueni K. Popov; B. Bojhkov; Lyubomir V. Tsonev; Svetlen H. Tonchev
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

A new type of translation-rotation encoder using diffraction gratings is proposed and its advantages upon previously developed ones are pointed out. It makes use of two transparent dielectric gratings with the same groove spacing, each of them being joint to each of the moving parts whose relative displacement has to be detected and measured. The first grating is lighted under -1 order Littrow incidence, and the wavelength-to-groove spacing ratio is chosen in such a way that only 2 diffracted orders propagate both in reflection and transmission. The two transmitted orders fall on the second grating, and it is shown that they produce interference fringes with highest possible visibility in a large range of groove profile parameters and other experimental conditions. Thus this mounting allows producing high accuracy encoders by using cheap photoresist or plastic gratings, which opens the way to industrial applications in high-precision mechanics, information processing, etc.

Paper Details

Date Published: 24 September 1998
PDF: 9 pages
Proc. SPIE 3450, Theory and Practice of Surface-Relief Diffraction Gratings: Synchrotron and Other Applications, (24 September 1998); doi: 10.1117/12.323414
Show Author Affiliations
Michel Neviere, Lab. d'optique Electromagnetique (France)
Evgueni K. Popov, Institute of Solid State Physics (France)
B. Bojhkov, Institute of Solid State Physics (Bulgaria)
Lyubomir V. Tsonev, Institute of Solid State Physics (Bulgaria)
Svetlen H. Tonchev, Institute of Solid State Physics (Bulgaria)


Published in SPIE Proceedings Vol. 3450:
Theory and Practice of Surface-Relief Diffraction Gratings: Synchrotron and Other Applications
Wayne R. McKinney; Christopher A. Palmer, Editor(s)

© SPIE. Terms of Use
Back to Top