| Summary: | 碩士 === 國立成功大學 === 製造工程研究所 === 84 === In general laser machining process, laser beam alignment deeply
influences machining quality. Because CO2 laser and Nd-YAG laser
often used in related fields are not visible beam, it is
necessary to establish a automatic laser beam alignment system
to improve the automatic production of laser machining. The main
purpose of this paper is to design and develope a system which
is able to sense the position of laser beam center, and then to
be integrated with the laser beam delivery system of a laser
machine inthe future.In chapter 2 three defferent sensing
theories are developed. All principles of them try to take
advantage of available optical sensors and special hardware
design to sense position of laser beam. One of these three
theories "The method of laser beam intersection with a rotating
convex spherical mirror" is choosed to be valued the real system
performance. According to the results of those experiments in
chapter 4 and chapter 5, the sensing precision of the system can
keep above 90%. Additionally the maximun laser beam power the
system accepted is 50 watt, therefore, it is already enough to
be applied in practical conditions.
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