Surface Measurement Methods Based on Single and Multi-Frequency Fringes and its Applications in Reverse Engineering

Abstract:

The 3D surface measurement methods are described based on the single and multi-frame fringe projection principles, respectively. The key algorithm  phase reconstructing (PR) is conducted by means of two different concepts; one is the single-frequency spatial phase reconstructing method and the other is the multi-frequency temporal one. On the side of spatial PR, a few typical methods are carried out, among which the most robust one could be achieved. The described spatial methods are implemented under the guide of the suggested modulation gradient variance (MGV) map. Moreover, the network programming (NP) method is also conducted to compare with them. The tested results show that the weighted least square (WLS) is the most robust one among the spatial PR methods. At the same time, the temporal PR method is introduced based on the multi-frequency fringes, and the result proves that it features the better noise immunity and robustness than spatial ones, but needs many different frequencies of fringes that would be more time-consuming. Lastly, the surfaces are reconstructed in reverse engineering (RE) software.

• Periodical: Applied Mechanics and Materials (Volumes 148-149)
• Pages: 460-464
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.148-149.460
• Online since: December 2011
• Authors: Yong Jian Zhu, Jing Xin Na, Jian Feng Sun, Shao Hui Yin
• Keywords: Multi-Frequency Fringe, Phase Reconstructing, Surface Measurement

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