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As the rapid progress in the development of optoelectronic components and computational power, 3D optical metrology becomes more and more popular in manufacturing and quality control due to its flexibility and high speed. However, most of the optical metrology methods are limited to external surface. This paper proposed a new approach to measure tiny internal 3D surfaces with a scanning fiber endoscope...
Corona graphic space telescopes require wave front control systems for high-contrast imaging applications such as exoplanet direct imaging. High-actuator-count MEMS deformable mirrors (DM) are a key element of these wave front control systems, yet they have not been flown in space long enough to characterize their on-orbit performance. The MEMS Deformable Mirror Cube Sat Test bed is a conceptual nanosatellite...
Currently, thin films are widely used for the display product. Furthermore, the protective film is often attached to touch films and cover glasses for their safety. However, relatively few researches have been done for those products and there are many issues when we use current inspection system for multi-layered thin films. In this paper, we propose the novel method to inspect them based on 3d surface...
Optical coherence tomography (OCT) is a non-invasive and non-contact technique to measure cross-sectional structural images of samples at micrometer resolution. Functional extensions of OCT has been developed to enhance contrast based on physical properties, such as absorption spectrum and elasticity or stiffness. This research develops a multi-functional optical coherence tomography by combining...
A novel in-plane and out-of-plane deformation simultaneous measurement method using only two speckle patterns grabbed before and after deformation of an object with rough surfaces is proposed. An optical system is set up by improving ordinary two-beam speckle interferometer. In the new optical system, because a phenomenon of in-plane and out-of-plane deformation can be simultaneously recorded by only...
The number of applications using cellulose nanocrystals (CNCs) has been consistently increasing due to their sustainable character and unique set of properties. The thermal stability of CNC films has been recently explored by determining the coefficient of thermal expansion (CTE), where optical response under polarized light was employed to highlight textural features required for digital image correlation...
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