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

Directional Moiré Boosting Using Spatial Filtering

“…The moiré generation part of the experimental setup is similar to that in one of my previous papers [10]. First, the LASER beam from a 632.8 nm He-Ne LASER source is expanded with the help of a beam-expander and split by a beam-splitter with one beam falling on the Spatial Light Modulator (SLM) and the another part falls on a mirror.…”

“…Yu et al [8,9] worked on the visible moiré patterns and the influence of different grating frequencies on the resulting moiré patterns. Joydeep [10] has shown a method for experimental variation of shape of the moiré patterns generated using interferometry and a Spatial Light Modulator. Directional edge boosting has been used in imaging previously [11][12][13][14].…”