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Full-Text Articles in Physics

High-Speed 3d Shape Measurement With Fiber Interference, Beiwen Li, Pan Ou, Song Zhang Aug 2014

High-Speed 3d Shape Measurement With Fiber Interference, Beiwen Li, Pan Ou, Song Zhang

Mechanical Engineering Conference Presentations, Papers, and Proceedings

This paper presents a miniaturized fringe projection system that only uses two fibers to potentially achieve superfast (e.g., MHz to GHz) 3D shape measurement speeds. The proposed method uses two optical fibers that carry the same wavelength of laser light with polarization and phase information properly modulated to generate high-quality sinusoidal fringe patterns through interference. The high-speed phase shifting is achieved by employing a high-speed Lithium Niobate (LN) electrooptic phase modulator. Since only two optical fibers are used to generate sinusoidal patterns, the system has a great potential of miniaturization for applications where the sensor size is critical (e ...


How Do Evaporating Thin Films Evolve? Unravelling Phase-Separation Mechanisms During Solvent-Based Fabrication Of Polymer Blends, Olga Wodo, Baskar Ganapathysubramanian Jan 2014

How Do Evaporating Thin Films Evolve? Unravelling Phase-Separation Mechanisms During Solvent-Based Fabrication Of Polymer Blends, Olga Wodo, Baskar Ganapathysubramanian

Mechanical Engineering Publications

Solvent-based fabrication is a flexible and affordable approach to manufacture polymer thin films. The properties of products made from such films can be tailored by the internal organization (morphology) of the films. However, a precise knowledge of morphology evolution leading to the final film structure remains elusive, thus limiting morphology control to a trial and error approach. In particular, understanding when and where phases are formed, and how they evolve would provide rational guidelines for more rigorous control. Here, we identify four modes of phase formation and subsequent propagation within the thinning film during solvent-based fabrication. We unravel the origin ...