Temporal heterodyne shearing speckle pattern interferometry |
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| Institution: | 1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China;2. Vision Lab. ISEN Brest, L@bISEN, 20 rue Cuirassé Bretagne, CS 42807, 29228 Brest Cedex 2, France;3. Université de Brest, Lab-STICC, 6 avenue Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France;1. School of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China;2. School of Computer Science and Information Technology, Liaoning Normal University, Dalian Liaoning, China;3. Department of Information and Communications, Pukyong National University, 599-1, Daeyeon 3-Dong, Nam-Gu, Busan, Republic of Korea;1. Photovoltaic Technology Team, Samsung SDI, CheonanSi 331-300, South Korea;2. Department of Polymer Science and Engineering, Pusan National University, Busan 609-735, South Korea;1. Department of Mechanical, Materials and Aerospace Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA;2. Department of Mechanical Engineering, Northern Illinois University, DeKalb, IL 60115, USA;3. Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Bari 70126, Italy |
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| Abstract: | Shearing speckle pattern interferometry is a full-field speckle interferometric technique used to determine surface displacement derivatives. In this paper, a new measurement system of real-time heterodyne shearography interferometry is presented. This system combined with heterodyne measurement, shearography interferometry and time domain signal processing technology can dynamically detect the out-of-plane displacement gradient. The principles and system arrangement are described. Using the Jones matrix, the mathematical expression of light intensity distribution passing through this system is deduced. A preliminary experiment was performed to demonstrate the performance of this new device, and simulations were conducted using the finite element method. Comparison of results shows that quantitative measurement of the displacement derivative has been achieved. |
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| Keywords: | Shearography Heterodyne Polarization Wavelet transformation |
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