DETERMINATION OF SMALL ANGULAR DISPLACEMENT BY MOIRE FRINGES OF MATCHED RADIAL-PARALLEL GRATINGS

Citation
Bj. Kim et al., DETERMINATION OF SMALL ANGULAR DISPLACEMENT BY MOIRE FRINGES OF MATCHED RADIAL-PARALLEL GRATINGS, Applied optics, 36(13), 1997, pp. 2848-2855
Citations number
24
Categorie Soggetti
Optics
Journal title
ISSN journal
00036935
Volume
36
Issue
13
Year of publication
1997
Pages
2848 - 2855
Database
ISI
SICI code
0003-6935(1997)36:13<2848:DOSADB>2.0.ZU;2-3
Abstract
We investigate the properties of the moire fringes of matched radial-p arallel (MRP) gratings that are useful for the fine visual indication of angular displacements. Moire patterns formed by overlapping two dif ferent MRP gratings of angular pitches, P-theta and P-theta' (<P-theta ) can provide a simple fringe-counting method for determining both the angle and the direction of the relative angular displacement of the g ratings within the accuracy of (P-theta'/M-theta), where M-theta is th e angular magnification for radial vernier fringes. (C) 1997 Optical S ociety of America.