The Development of a Miniature Optical Directional Positioner

• Main Author: 李成豪
• Other Authors: 葉競榮
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/04750311114133772343

碩士 === 大葉大學 === 電機工程學系碩士班 === 93 === In an ultrasonic testing, the key factors affecting the accuracy of flaw locating are the probe position and its direction, the refraction angle of probe and echo sound path length. In this article, we introduce the development of a new optical device for probe locating and determination of its pointing direction. Conventional probe locators use a design with arms and encoders. Usually, these devices are relatively big, heavy, and not easy to handle. The new optical probe locator measures the travel distance by comparing several consecutive images captured by the integrated camera. The device doesn’t have the drawbacks of conventional probe locators, besides it is much cheaper. Theoretically the accuracy of the device can be up to 400cpi and our test result are very close to this figure, so the proposed device is quite useful for many similar applications in different industries.