Abstract
Moiré images that are generally termed as moiré fringes have been generated due to the interference of two repetitive gratings. These patterns can be applied to many uses in metrology such as the measurements of surface profilometry of aerofoil, stress-strain effects, thermal deformation and so on. Moreover, 3D surface reconstruction as well as movement characterization of linearly and rotary moving objects can be visualized and identified by the moiré imaging technique. Recently it is approached as an emerging tool in the fields of biotechnology-particularly in biomechanics, nanotechnology, broadband communication and optoelectronics as well. Conventional Moiré interferometry evaluates the interference of two light waves being reflected on a reference surface and the object to be profiled. However, satisfactions in the requirements for the current significant issues in obtaining accurate measurements regarding the information of the movements as well as the dimensional deformations of objects dealing with the online inspection in micro-level and nano-level are still challenging. Particularly, for the demand of the present real-time auto-inspection of different precise information of movements objects statistically and dynamically. In that case single light wave system makes the moiré sensing system easier and applicable in real-time imaging. Furthermore, avoiding the employment of expensive conventional imaging facilities in 3-D measurement in mechanical as well as bio-mechanical systems has become a critical problem to be tackled. Therefore, research has been conducted focusing on the objective of developing a simple but precise measuring tool based on a single wave moiré imaging technique for multidimensional motion sensing by employing simple image processing approaches. An experimental set-up with a small CMOS camera has been developed capable of measuring the motion of an object by using a simply ink-printed straight optical grating lines attached to the moving objects. Several model experiments have been conducted for getting the information of movements of an object by adopting several mouse click options only on the moiré image visible at the computer screen. After getting information of the moiré image by the proposed technique, the movements of the object have been accurately identified. The system has been found simple and faster compared to the other conventional methods as well.
Highlights
The word moiré refers to the meaning as watered or wavy appearance which evolved from the ancient French word mouaire
Research has been conducted focusing on the objective of developing a simple but precise measuring tool based on a single wave moiré imaging technique for multidimensional motion sensing by employing simple image processing approaches
Experiments have been conducted focusing on the objective of developing a single wave moiré imaging technique for multidimensional motion sensing
Summary
The word moiré refers to the meaning as watered or wavy appearance which evolved from the ancient French word mouaire. Since the theoretical analysis of moiré phenomena has been based on purely geometric or algebraic approaches. Based on these approaches many special purpose mathematical developments have been devised for the needs of specific applications such as strain analysis, surface profilometry in metrology, etc. More recently several new approaches have been proposed for studying moiré phenomena, based, respectively, on no-standard analysis, on elementary geometry and potential theory, or on algebraic geometry. It is, undoubtedly the Fourier-based approach that most significantly contributed to the theoretic investigation of the moiré phenomenon
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