People

Dr. Jong-Shinn Wu, Distinguished Professor of National Yang Ming Chiao Tung University: “ Making Taiwan Indispensable to the World: the Resilience and Perseverance of Taiwan’s Technology Development” [ 下載 PDF ]

Claire Lin, Hung-Pin Chen, Hua-Lin Chen

Optical Measurement Technology and Industrial Application

A Review of 3D Structured Light Measurement Methods and Applications [ 下載 PDF ]

Yu-Wen Chang

Traditional 2D image techniques are insufficient for market demand, and 3D measurement techniques, which owns the depth information, are rising. Among 3D measurement techniques, structured light method is widely applied due to its high resolution and high accuracy. In this article, first, three common 3D non-contact shape measurement techniques will be introduced, and the principle and the calibration of structured light method will be explained. Next, the coding methods and patterns will be classified and compared by their characters, and some examples of applications in different fields will be listed. Finally, present challenges and improvements of 3D measurement techniques will be discussed to understand its future development.

A Review of 3D Structured Light Measurement Methods and Applications [ 下載 PDF ]

Chun-Tse Lee, Jen-Yuan Chang

In the modern application of robotic manipulators, collocation with an optical system has become mainstream. However, to achieve vision servo control, the alignment between the coordinate of the camera and the manipulator should be calibrated. According to the placement of the camera, the method of the eye-hand calibration can be divided into eye-in-hand and eye-to-hand. In this article, the mathematic models of these two methods are built and the literatures are arranged by the order of scenario, optimized algorithms and the placement of cameras.

Introduction of Moiré Method and Application [ 下載 PDF ]

Kuo-Shu Kao

The detection scales are getting smaller and more precise with the development of science and technology. Therefore, the measurement technology has gradually changed from traditional contact measurement to optical non-contact measurement technology. As representative non-contact optical techniques, Moire methods have been extensively used to visualize deformation distributions of materials, arrangements of structures, and shape features of objects in research and industrial fields. This paper focuses on the introduction of Moirė measurement technology including Geometric Moirė, Shadow Moirė, Moirė Interferometry, Projection Moirė, and Sampling Moirė. The Moirė techniques are promoted by the demands of high-accuracy, multi-scale, extremely small- or largescale, high-temperature, dynamic, on-line measurements and three-dimensional.

Optical Inspection of Neural Network Vision Alignment Algorithm for Flexible Displays Based on Whole-folding Test [ 下載 PDF ]

Bor-Jiunn Wen, Pin-Hsuan Hung, Ting-Yu Tseng

In order to inspect the durability of flexible displays, this study creates an automatic optical detection system (ODS), which includes a neural network as an alignment control algorithm, an XYZ platform with a rotatable stage, and the image capture instrument performed optical image measurement of flexible displays in four degrees of freedom. In addition, this study creates an automatic whole-folding testing system (AWTS), which can adjust the folding or bending radii for the whole sample folding or bending operation. During the whole-folding test of the flexible display, the flexible display requires the corresponding rotation angle of the flexible display in different sizes to perform the optical inspection in the vertical normal direction. According to the optical image measurement of flexible displays based on different sizes on the AWTS, this study uses ODS for orthogonal alignment, and automatically aligns the flexible display to the center of the display surface by using a neural network vision alignment algorithm for automatic optical inspection. Finally, this study uses a neural network to control the ODS of four degrees of freedom, and the maximum control error percentage is 2%. In addition, this study measures the optical characteristics of the flexible cholesteric liquid crystal display for a whole-folding test. As a result, it is found that the attenuation optical characteristics increased as the number of folds increased, and the maximum attenuation percentage of the optical gray value in some local areas after the whole-folding test is 10%. Therefore, based on the measurement results of this study and the neural network vision alignment algorithm created by this study, the automatic optical inspection method is suitable for evaluating the performance of flexible displays based on whole-folding tests to provide the improved flexible characteristics of flexible displays.

Column

The Development of Polyurethane Chemical Recycling Technology under Plastic Circular Economy [ 下載 PDF ]

Chia-Wei Jui

The use of polyurethane (PU) is increasing day by day, and the waste disposal problems it generates are also becoming increasingly important. Based on the "circulation" referred to by the circular economy, it is preferable to use a chemical recycling method to develop sustainable PU plastics in a way that can be recycled and reused. In addition to introducing PU's main chemical recycling traditional technologies (hydrolysis, glycolysis, aminolysis, phosphate esters and acid hydrolysis), this article also shares recent breakthroughs in the development of competitive PU new chemical recycling technologies at home and abroad to grasp the current status and development of the latest PU chemical recycling industry technologies.

Popular Science

Development Trends of Atomic Force Microscopy - Precision Detection [ 下載 PDF ]

James Su

NARLabs i-ONE Competition of 2020

Mobility Scooter AI Braking Assistant [ 下載 PDF ]

Tun-Yun Lo, Yu-Chen Lai, Ying-Chen Lu, Wen-Shiang Li, Yan-Ru Chen, An-Ju Chen