Browsing by Author "Tsai, Meng-Yen"

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A new two-DOF rotational optical image stabilizer
(2011-06-01)
Chao, Paul C-P
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Chen, Yu-Han
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Chiu, Chi-Wei
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Tsai, Meng-Yen
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Chang, Jyh-Yeong
This work proposes design, optimization and validation of a new two degree-of-freedom (DOF) rotational optical image stabilizer (OIS) that is suitable for installing into a mobile-phone-camera. This OIS differs from the previous designs since it stabilizes the lens holder directly by two-DOF translational mechanisms that are actuated by voice coil motors. The work can be divided into three main parts: (1) designs of mechanism and genetic algorithm (GA) optimization of magnetic field, (2) establishments of the dynamic model and equation of motions (EOM) of a dual-axis rotational structure, and (3) realizations of a sliding mode control (SMC) controller with fine performance. The dynamic of the dual-axis rotational OIS system has been analyzed and the EOM has been derived. Based on the Lagrange's method, the motions of the OIS have been modeled through considering kinetic energy and electromagnetic torques. In the last part, the theory of SMC is applied, and the associated simulations are conducted. Based on the simulation results, the SMC controller is forged with the assistances from MATLAB pre-simulation and tested by a microprocessor module. After a series of experiments and verifications, the prototype of the novel OIS is finally accomplished with satisfactory performance of vibration reduction.
Highly efficient flexible inverted organic solar cells using atomic layer deposited ZnO as electron selective layer
(2010-02-07)
Wang, Jen-Chun
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Weng, Wei-Tse
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Tsai, Meng-Yen
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Lee, Ming-Kun
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Horng, Sheng-Fu
Laser Diode Feedback Signal for Position Sensing Using Self-Mixing Interference
(2009-03-01)
Tsai, Meng-Yen
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Liu, Tzong-Shi
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Schlesinger, Tuviah E.
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機械工程學系
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Department of Mechanical Engineering
We modified a digital versatile disk (DVD) pickup head as a DVD actuator with a laser diode package for sensing. Tuning a tilting coil in the DVD actuator causes the tilt of a laser diode to compensate misalignment between a target surface and the laser diode facet. Experimental results show that tuning the tilting coil compensates misalignment between both surfaces to achieve effective self-mixing signal. Furthermore, we present the conformity between the output voltage and the target surface displacement from a laser diode package using the self-mixing effect. The resolution in linear region of self-mixing signal is 100 mV/nm. (C) 2009 The Japan Society of Applied Physics.
Nanoparticle Manipulation Using Atomic Force Microscopy
(2010-02-01)
Tsai, Meng-Yen
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Liu, Tzong-Shi
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機械工程學系
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Department of Mechanical Engineering
To develop nanotechnology, nanoparticle manipulation plays all Important role in the assembly of nanoelements This Study aims to Manipulate nanoparticles using an atomic force microscope and X-Y positioning stage Strain gauges serve as sensors to Measure the travel distance of piezo-drivers in an X-Y stage In all atomic force microscopy system Nanoparticles are pushed based oil sliding mode control whose robust properties can deal with model uncertainty and disturbance In addition, a fuzzy controller is responsible for compensating "up-particle contact loss". so its to establish all accurate and stable manipulation system Experimental results demonstrate pushing nanoparticles oil Inclined substrates, different limited scanning ranges with different slope angles, and removing and remaining nanoparticles oil inclined substrates.
Robust control design for precision positioning of a generic piezoelectric system with consideration of microscopic hysteresis effects
(2011-06-01)
Chao, Paul C-P
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Liao, Pen-Yen
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Tsai, Meng-Yen
;
Lin, Chin-Teng
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影像與生醫光電研究所
This study performs precision positioning of a generic piezoelectric structure against hysteresis effects by finite elements, microscopic hysteresis cancellation and robust H? compensation. The designed control algorithm is expected to be effective in enhancing servo performance of hard disk drives. The precision positioning is accomplished by adding a polarization term into the linear constitutive equations of piezoelectric materials. This polarization term is then described by the well-known Preisach model. Applying basic principles of finite elements and Hamilton's thoery, the macroscopic governing equations of an arbitrary piezoelectric system in finite elements are obtained. Based on the macro-model, a controller consisting of two parts is designed to perform the precision positioning of a generic piezo-structure. The first part is responsible for direct hysteresis cancellation at the microscopic level, while the second one is a robust H(infinity) controller to overcome inevitable cancellation errors. In this way, the control effort is then more effective than the conventional PI and double-lead controller without microscopic hysteresis cancellation. A simple piezoelectric structure of a bender-bimorph cantilever beam is considered for designs and experimental validation. Based on experimental results, the proposed control design is found effective to suppress hysteresis effects as opposed to conventional controllers.