| 摘要(英) |
This thesis is dedicated to design the auto focus system driven by the shape memory alloy, mainly divided into two parts of the hardware setup and the software development.
The focus actuator uses the line type of the shape memory alloy to drive the mechanism doing the reciprocating movement. Then, with the optical imaging principle select the appropriate lens and the image sensor to set up the imaging platform. And designing the PWM circuit controls the shape memory alloy temperature. Through the microcontroller as the communication sends the message calculated on the PC to the heating circuit.
In the computer, writing the Borland C++ Builder interface captures the real time image from the web camera, and identifies the image clarity. Using the mountain climbing search concept designs the several current modulation rules. Which will be compared the advantages and disadvantages from the real experiment result.
Finally, the whole working auto focus processes are ported to the ARM embedded system. Expect to break away the computer control to simplify the entire auto focus system.
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| 參考文獻 |
[1]Koji Ikuta, Masahiro Tsukumoto, Shigeo Hirose, “Shape memory alloy servo actuator system With electric resistance feedback And application for active endoscope”, Proceeding of the Robotics and Automation, pp. 427-430 vol.1, Apr. 24-29, 1988.
[2]Shu-Horn Liu, Jia-Yush Yen, “A hexapod robot based on shape memory alloy actuators”, Proceeding of the 4th IFAC-Symposium on Mechatronic Systems, Heidelberg, Germany, pp. 589-593, Sep. 12-14, 2006.
[3]董志強，「智慧型材料驅動機械手之設計」，國立中央大學機械工程研究所，碩士論文，June 2007。
[4]C. Mavroidis, “Development of Advanced Actuator Using Shape Memory Alloys and Electrorheological Fluids”, Research in Nondestructive Evaluation, vol.14, pp.1–32, 2002.
[5]楊三本，「形狀記憶合金驅動的對焦致動器之設計」，國立中央大學機械 工程研究所，碩士論文，June 2009。
[6]賴耀仁，「線型形狀記憶合金之力學特性及其應用研究」，大同大學機械工程研究所，博士論文，2011。
[7]Fang-Hsuan Cheng, Hsin-Wei Ma, “Research on Fast Image Based Auto Focus Technique”, Journal of Information Technology and Applications, Vol. 3, No. 1, pp. 67-76, 2008.
[8]Jie He, Rongzhen Zhou, and Zhiliang Hong, “Modified Fast Climbing Search Auto-focus Algorithm with Adaptive Step Size Searching Technique for Digital Camera”, IEEE Transactions on Consumer Electronics, Vol. 49, No. 2, MAY 2003.
[9]胡友文，「形狀記憶合金力學特性之研究」，大同大學碩士論文。
[10]維基百科，http://en.wikipedia.org/wiki/Shape_memory_alloy#cite_note-ot-0
[11]徐文祥教授,「 微致動器原理簡介」, 交通大學機械系。
[12]雷良煥、黃吉成、徐永珍，「後來居上的CMOS 影像感測器」，物理雙月刊32卷1期。
[13]林宗輝，「手機照像感測元件的技術概觀」，電子時報，2007年1月。
[14]R.C. Gonzalez and R.E. Woods, “Digital Image Processing”, Prentice-Hall, New Jersey (2002).
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