碩士 / 國立臺灣科技大學 / 機械工程系 / 97 / The objective of the study is to develop a portable optical measurement system for the surface characteristics, including the surface roughness, profile, and the print-through phenomenon (PTP), for the yacht-used fiber-reinforced plastics (FRP). The developed system mainly consists of a micro-focused fan-shaped laser as a fringe projector, a focus lens, a CCD Camera, a measurement box body with a screen for the reflected fringe, a notebook PC, and a set of developed measurement software. The measurement length of the focused parallel beam is 43 mm. Appling a 1mW laser as a fringe projector to measure the flat specimens, and use of the indexes of image profile peak-valley height and average line width to evaluate the surface roughness value (Rmax) of the test specimens, the average system deviations were 34.15％ and 25.4％, respectively. Appling a 5mW laser as a fringe projector to measure the local smoothed 2D specimens, and use of the index of curve average line width to estimate the Rmax and Ra, the average system deviation were 6.25％ and 1.7 ％, respectively. Using a 5mW laser as a fringe projector to measure the local profile of a 2D smooth specimen, compared with the contact contour profile measuring system, a transformation factor of 56.57 for profile calibration was obtained. The maximum profile deviation was about + 2.72μm based on the calibration results. Using the curve peak-valley height index and the curve average line width index to estimate the surface roughness value (Rmax) of the curved specimens, the average system deviations were 6.25％ and 1.7％, respectively. Using fast Fourier transform (FFT) method to estimate the PTP of the test specimens, the more obvious the PTP, the larger the magnitude of FFT, based on the analysis results.
| Identifer | oai:union.ndltd.org:TW/097NTUS5489183 |
| Date | January 2009 |
| Creators | Chi-meng Chan, 詹啟孟 |
| Contributors | Fang-Jung Shiou, 修芳仲 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 119 |
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