Controlling the Shapes of the Moiré Patterns Generated Using the Interferometry and a Spatial Light Modulator

Abstract: Moiré patterns are generated by the superposition of two periodic patterns of close frequencies. This present paper proposes a simple method to bridge the conventional gap between interferometry and moiré patterns by generating moiré patterns using straight-line interference fringes from a Michelson interferometer like setup and a circular grating pattern generated on a Spatial Light Modulator (SLM). The visible variation in the geometrical shapes of the moiré patterns by varying the ratio of the periods of the two periodic patterns has also been presented. The experimental results match with the simulation results. Keywords: Moiré, Interferometry, Spatial Light Modulator, Optics, Engineering physics

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Directional Moiré Boosting Using Spatial Filtering

International Journal for Research in Applied Science and Engineering Technology ◽

10.22214/ijraset.2021.38200 ◽

2021 ◽

Vol 9 (9) ◽

pp. 1430-1431

Author(s):

Joydeep Chatterjee

Keyword(s):

Spatial Light Modulator ◽

Spatial Filtering ◽

Spatial Filter ◽

Fringe Analysis ◽

Light Modulator ◽

Small Frequency ◽

Simple Method ◽

Moire Patterns ◽

Filtering Technique ◽

Moiré Patterns

Abstract: Overlapping of two or more grating structures of small frequency differences gives rise to the Moiré patterns. While the overall moiré patterns are widely studied, in many cases – specially in case of a zonal fringe analysis – zone or direction based highlighting or suppression of moiré patterns are very helpful. This paper presents a simple method for directional boosting of moiré patterns, generated using Spatial Light Modulator (SLM) based interferometric setup, using the spatial filtering technique. Keywords: Moiré, Spatial Filter, Directional Boosting, Interferometry, Spatial Light Modulator, Optics

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Quality Enhancement of a Complex Holographic Display Using a Single Spatial Light Modulator and a Circular Grating

Journal of the Optical Society of Korea ◽

10.3807/josk.2016.20.1.070 ◽

2016 ◽

Vol 20 (1) ◽

pp. 70-77 ◽

Cited By ~ 7

Author(s):

Le Thanh Bang ◽

Yan Ling Piao ◽

Jong Jae Kim ◽

Nam Kim

Keyword(s):

Spatial Light Modulator ◽

Quality Enhancement ◽

Light Modulator ◽

Holographic Display ◽

Circular Grating

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Moire Fringes on Precipitates in Quenched and Aged Beryllium

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100101888 ◽

1968 ◽

Vol 26 ◽

pp. 426-427

Author(s):

F. J. Fraikor ◽

A. W. Brewer

Keyword(s):

Ternary Phase ◽

Volume Fraction ◽

Age Hardening ◽

Orientation Relationships ◽

Solute Content ◽

Moiré Fringes ◽

Moire Patterns ◽

Total Volume Fraction ◽

Diffraction Patterns ◽

Moiré Patterns

A number of investigators have examined moire patterns on precipitate particles in various age-hardening alloys. For example, Phillips has analyzed moire fringes at cobalt precipitates in copper and Von Heimendahl has reported on moire fringes in the system Al-Au. Recently, we have observed moire patterns on impurity precipitates in beryllium quenched in brine from 1000°C and aged at various temperatures in the range of 500-800°C. This heat treatment of beryllium rolled from vacuum cast ingots produces the precipitation of both an fee ternary phase, AlFeBe4, and an hcp binary phase, FeBe11. However, unlike a typical age-hardening alloy, the solute content of this material is low (less than 1000 ppm of Fe and 600 ppm of Al) and hence the total volume fraction of precipitates is small. Therefore there is some difficulty in distinguishing the precipitates and their orientation relationships with the beryllium matrix since the weak precipitate spots generally do not appear on the diffraction patterns.

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