The influence of grid geometry on moiré fringe properties

1965 ◽  
Vol 1 (1) ◽  
pp. 1-10 ◽  
Author(s):  
F Zandman ◽  
G. S. Holister ◽  
V Brcic
Keyword(s):  
Second Order ◽  
Grid Systems ◽  
Propagation Of Light ◽  
Moiré Fringes ◽  
Moire Fringe ◽  
Hybrid Grid ◽  
Moiré Fringe ◽  
Fringe Multiplication

General equations are developed which relate the characteristics of moiré fringes to the geometry of two superposed, dissimilar grid systems. Equations are derived geometrically, assuming the rectilinear propagation of light, and the analysis is restricted to a consideration of linear, periodic, mutually inclined systems. Criteria are established for the production of first and second order fringe systems, and some particular cases of grid geometry are examined in detail. The concepts of mixed grids and hybrid grid combinations are introduced, and the principles and possible applications of fringe sharpening, fringe multiplication and dual sensitivity systems are discussed.

An automatic high-speed scanner for moiré fringe techniques

1972 ◽  
Vol 7 (2) ◽  
pp. 151-156 ◽  
Author(s):  
D J Hitchings ◽  
A R Luxmoore
Keyword(s):  
High Speed ◽  
Peak Detection ◽  
Optical Signal ◽  
Single Line ◽  
Scanning System ◽  
Moiré Fringes ◽  
Moire Fringe ◽  
Scanning Line ◽  
Moiré Fringe

A high-speed scanning system has been developed to locate the centres of moiré fringes along any single line. The system comprises a rotating-mirror scanner for conversion of an optical signal to electrical; this conversion is followed by peak detection, storage, and print-out electronics. Up to 20 fringes can be scanned in 1 ms. The results are printed in terms of fringe separations along the scanning line.

The influence of grating characteristics on moiré fringe multiplication

1988 ◽  
Vol 28 (4) ◽  
pp. 329-335 ◽  
Author(s):  
S. M. Graham ◽  
R. J. Sanford
Keyword(s):  
Moire Fringe ◽  
Moiré Fringe ◽  
Fringe Multiplication

Multiplication and Interpolation of Moire´ Fringe Orders by Purely Optical Techniques

1967 ◽  
Vol 34 (2) ◽  
pp. 425-430 ◽  
Author(s):  
C. A. Sciammarella ◽  
N. Lurowist
Keyword(s):  
The Other ◽  
Optical Techniques ◽  
Compensation Process ◽  
Moiré Fringes ◽  
Moire Fringe ◽  
Compensation Technique ◽  
Moire Method ◽  
Moiré Fringe ◽  
Fractional Orders

Two new, purely optical techniques are introduced to increase the sensitivity of the moire´ method. One of the techniques makes it possible to observe moire´ fringes of fractional orders. Observation of moire´ fringes of the p/5-order are reported, which means that, with the 300-lines-per-in. grid utilized in the examples presented in the paper, it is possible to observe the same pattern that could be observed with a 1500-lines-per-in. grid. The other technique makes it possible to read fractional orders by a compensation technique similar to Tardy’s compensation process utilized in photoelasticity.

On replication for moiré-fringe multiplication

1980 ◽  
Vol 20 (5) ◽  
pp. 167-169 ◽  
Author(s):  
R. E. Rowlands ◽  
J. H. Vallem
Keyword(s):  
Moire Fringe ◽  
Moiré Fringe ◽  
Fringe Multiplication

Study of the Light Source Affects the Second Order Moiré Fringe Quality of Nano-Grating

2011 ◽  
Vol 103 ◽  
pp. 57-62
Author(s):  
Xiu Shui Ma ◽  
Xiao Ji Sun ◽  
Wei Hong Zhong ◽  
Hong Wei Guan
Keyword(s):  
Light Source ◽  
Second Order ◽  
Important Influence ◽  
Paper Study ◽  
Software Simulation ◽  
First Order ◽  
Moire Fringe ◽  
Theoretical Evidence ◽  
Moiré Fringe

Two groups of indicator grating and scale grating produce two groups of first order Moiré fringe. Two groups of first order Moiré fringe interfere and produce second order Moiré fringe, and then by signal measurement and subdivide to the second order Moiré fringe, we can achieve nanometer accuracy. In which, the quality of the second order Moiré fringe has important influence on the quality of the nano-grating quality. In the second order Moiré fringe formation process, the characteristic of light source, the manufacture and assembling accuracy of scale grating and indicator grating and optical system, interference and noise etc. have an important influence on the quality of the second order Moiré fringe. This paper study the change of light source properties which formed the second order Moiré fringe to the quality of the second order Moiré fringe based on Lighttools software simulation. In order to provide a theoretical evidence for optimize design of the light source.

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