教師著作

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Author: search.filters.author.Lin, Yu-HsuanHas files: No

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    Opto-mechanical analysis for confocal laser scanning microscopes
    (The International Society for Optical Engineering (SPIE), 2005-08-02) Chang, Gao-Wei; Twu, Ming-Jenq; Lin, Yu-Hsuan; Liao, Chia-Cheng; Kuo, Hung-Zen
    The confocal imaging has become one of the most widely applied microscopic techniques in various fields, such as biotechnology, automation engineering, optical engineering, solid-state physics, metallurgy, integrated circuit inspection, etc. Confocal laser scanning microscopy (CLSM) is primarily based on the use of apertures in the detection path to provide the acquired three-dimensional images with satisfactory contrast and resolution. The major objective of this paper is to analyze the imaging performance of the confocal microscopes with varying opto-mechanical conditions. In this paper, the working principles of the one- and two-dimensional scanning mechanisms in the microscopic systems are first reviewed and verified by opto-mechanical simulations. Then, for the imaging performance, the tolerance to the fabrication and assembly of the optical components in conventional confocal microscopes is also investigated by simulations. The simulation results indicate the importance of eliminating the effects of stray light in the microscopic systems.
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    White-light interferometric profile measurement system using spectral coherence
    (SPIE, 2007-01-23) Chang, Gao-Wei; Lin, Yu-Hsuan; Yeh, Zong-Mu
    It is well known that white light interferometry (WLI) is important to nano-scale 3-D profile measurement technology. To archive cost-effective and accurate measurements, the researches for WLI are widely spreading. Our objective is to build up a 3-D micro-structure profile measurement system based on WLI, for micro-mechatronic, micro-optical, and semi-conductor devices. This paper briefly reviews related WLI theory and then the principle of spectral coherence is employed to improve the system design. Specifically, proper spectral filters can be used to extend the coherence length of the light source to the order of several ten micrometers. That is, the coherence length of the filtered light source is longer than that of the original source. In this paper, Michelson interference experiments are conducted with filtered and unfiltered white light sources, to show the feasibility of the concept of spectral coherence. The Michelson interferometer is adopted due to its convenience of optical installation and its acceptable tolerance to noise. The experiment results indicate that our approach is feasible and thus it can improve the WLI measurement performance.
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    High-accuracy and cost-effective photodiode spectral response measurement system
    (SPIE, 2007-02-09) Chang, Gao-Wei; Lin, Yu-Hsuan; Yeh, Zong-Mu
    With the rapid growth of optoelectronics technologies, photodiodes (PDs) has been widely used in optical measurement systems, color measurement and analysis systems, etc. To meet most of the measurement requirements, the determination of PD spectral responses is very important. The goal of this paper is to develop a high-accuracy and cost-effective spectral response measurement system for PDs. In this paper, the proposed system contains a grating-based spectral filtering module, an amplifier module, and a digital-signal-processing (DSP) based platform. In the spectral filtering module, a single-grating monochromator based on a Czerny-Turner configuration is first analyzed and simulated, and then the experiments are conducted to check if the measurement accuracy is satisfactory. In the measurement system, optoelectronic signals from the PD under test are acquired from the amplifier module and the DSP-based platform is developed to communicate and manipulate the measured data. Through comparison with the measurement data from a commercially available system, it is found that our approach gives quite satisfactory results.
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    Multiple-Functional and Cost-Effective Liquid-Crystal Cell Parameter Measurement System
    (Society of Photo-optical Instrumentation Engineers (SPIE), 2007-02-12) Chang, Gao-Wei; Lin, Yu-Hsuan; Yeh, Zong-Mu
    For years, the technology of TFT-LCDs (thin-film-transistor liquid crystal displays) has grown very rapidly, especially in the market share and technical development of FPD industries. To effectively promote the industry's capacity for the mass production and quality control, it is urgent to design and develop LC cell optical parameter measurement systems. The goal of this paper is to develop a multiple-functional and cost-effective measurement system to lower the manufacturing cost for the industry. The optical parameters includes the pretilt angle, liquid crystal (LC) cell gap (or phase retardation), and twist angle, which highly influence the display quality. In this paper, we first study the past approaches and analyze their measurement performance. Then, a simple and cost-effective method is proposed to achieve the multiple functions. That is, in addition to the precise measurement of the three important optical parameters, the proposed system can measure the voltage-transmittance (V-T) curve. In our approach, the theoretical study, simulation, and experiment are performed to show the feasibility of the system implementation. Finally, the proposed system is developed to automatically measure the LC cell parameters. Experimental results indicate that the proposed measurement system gives a satisfactory result.
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    A Grating-based Spectral Filtering Project in Photonics Instrumentation
    (2005-12-01) Chang, Gao-Wei; Yeh, Zong-Mu; Lin, Yu-Hsuan; Chang, Hsiu-Ming
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    A Grating-based Spectral Filtering Project in Photonics Instrumentation
    (Institute of Electrical and Electronics Engineers (IEEE), 2006-02-01) Chang, Gao-Wei; Yeh, Zong-Mu; Lin, Yu-Hsuan; Chang, Hsiu-Ming
    In response to the growing demand of photonic systems engineers in industries, this paper proposes a term project that help students gain insight into photonics instrumentation via a grating-based spectrometer. The students are guided through simulations and experiments for the spectral filtering system and then implement the spectrometer using some technical notes and testing kits. They perform experiments and tests to verify and refine their works. A contest is held at the end of the course where the measurement accuracy and repeatability of the proposed systems are evaluated. This project has been used for two semesters, and both the instructors' and the students' feedback are discussed.