3-D surface profilometry based on modulation measurement by applying wavelet transform method |
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| Institution: | 1. College of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, China;2. Academy of flight Technology and Safety, Civil Aviation Flight University of China, Guanghan 618307, China;1. Departamento de Teoría de la Señal y Comunicaciones, Universidad de Alcalá, 28805-Alcalá de Henares, Spain;2. Departamento de Ingeniería Mecánica y Minera, Campus las Lagunillas, Universidad de Jaén, 23071-Jaén, Spain;1. Luleå University of Technology, Department of Engineering Sciences and Mathematics, Luleå, S-971 87 Sweden;2. University of Mosul, College of Engineering, Department of Mechanical Engineering, Mosul, Iraq;1. The School of Science, Hangzhou Dianzi University, Hangzhou, 310018 China;2. Department of Physics, Zhejiang University, Hangzhou, 310027 China |
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| Abstract: | A new analysis of 3-D surface profilometry based on modulation measurement technique by the application of Wavelet Transform method is proposed. As a tool excelling for its multi-resolution and localization in the time and frequency domains, Wavelet Transform method with good localized time-frequency analysis ability and effective de-noizing capacity can extract the modulation distribution more accurately than Fourier Transform method. Especially for the analysis of complex object, more details of the measured object can be well remained. In this paper, the theoretical derivation of Wavelet Transform method that obtains the modulation values from a captured fringe pattern is given. Both computer simulation and elementary experiment are used to show the validity of the proposed method by making a comparison with the results of Fourier Transform method. The results show that the Wavelet Transform method has a better performance than the Fourier Transform method in modulation values retrieval. |
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| Keywords: | Surface measurements Fringe analysis Wavelet transform Height measurements |
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