Program Design of The Real-Time System for Scanning Tunneling Microscope

• Main Authors: Chen, Yung-Hua, 陳永華
• Other Authors: Jian, Wen-Bin
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/23301308388699951639

碩士 === 國立交通大學 === 理學院碩士在職專班網路學習學程 === 97 === The main structure of a scanning tunneling microscope involves three parts—namely Mechanical part, Electrics part, and Computer program. The purpose of the research is to develop a computer image system mainly based on a homemade scanning tunneling microscope. Except for the ordinary function of outputting scanned images, the design of the image system provides various parameters to satisfy the needs of the experiment, two features--real time and variety. According to the result of the experiment, the researcher found that the factors that influence the quality of outputting images are not only the design of tips and mechanical system but also the software that processes the images. In addition, the data retrieved from the circuit system have to be processed adequately. That is, by improving the contrast and the tone of colors, the same images quality retrieved from commercial system can be achieved. Besides, to improve the image quality, solve the problem of thermal drifting of tips, and make the scanning output more authentic, the researcher devised a deslope algorithm to overcome the difficulties which may occur when the scanning tunneling microscope working under the room temperature. Moreover, to make the image quality more stable, some possible defects of the making of scanning tips were taken into consideration because this may directly influence the clarity of the retrieved images. Furthermore, to solve the problem of blur images resulted from asymmetry tips, the design the system allow the scanning tips to do arbitrary angle scanning, and provides the users two different options of tips movements.