Measurement Technique of the Smoothness of Curved Surface

• Main Author: 林鴻昱
• Other Authors: 范光照
• Format: Others
• Language: zh-TW
• Published: 1989
• Online Access: http://ndltd.ncl.edu.tw/handle/46692405618855675450

碩士 === 國立臺灣大學 === 機械工程研究所 === 77 === 　　SMC (Sheet Moulding Compound) is a kind of fiber reinforced plastic material. It has several features: such as high strength, light weight, and ease of forming. It has been applied to various areas, such as car body, pressure vessel, and so on. 　　The surface of SMC may be flat or curved. Under good forming conditions, the smoothness of the surface can be properly controlled. A precision system to inspect the surface smoothness is also needed. The conventional method using profilemeter may very often scratch the surface of SMC. Besides, its speed is too slow to use. 　　This thesis develops a non-contact measuring system for surface smoothness. By the use of a dual-axis scanner, a laser line can be projected onto the test piece, and scanned across the surface. A CCD camera is then employed to capture the image of the reflected line on a screen. The distortion of projected image can be related to the surface smoothness based on proposed mathematical model. Through image processing technique, the smoothness can be directly repressented by index value, and then classified by different grades.