Measurement of curvature distribution using digital speckle three-shearing aperture interferometry |
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| Authors: | KF Wang AK Tieu MH Gao |
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| Institution: | aDepartment of Structural Engineering and Mechanics, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Jiangsu 210016, China;bSchool of Mechanical, Materials and Mechatronic Engineering, Faculty of Engineering, University of Wollongong, NSW 2522, Australia;cDepartment of Applied Chemistry, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Jiangsu 210016, China |
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| Abstract: | Digital speckle three-shearing-aperture interferometry used for the measurement of curvature distribution fields of a deformation object is proposed for the first time. In this method, pure curvature distribution fringes without containing slope distribution fringes can be obtained by using digital speckle three-shearing-aperture interferometry. Two specklegrams, one before and the other after object deformation, are recorded by a CCD camera and stored in a computer. A 2-D fast Fourier transform (FFT) and a 2-D inverse FFT (IFFT) are performed on the two specklegrams. The subtraction of the transformed specklegrams will produce curvature distribution fringes, and the speckle noises in curvature distribution fringes can be removed after these fringes pass through low-pass filtering. Results from theory and experiments are in good agreement. |
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| Keywords: | Digital speckle Curvature measurement |
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