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Luo C.,Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices | Zhong L.,Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices | Sun P.,Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices | Wang H.,Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices | And 2 more authors.
Applied Physics B: Lasers and Optics | Year: 2015

An advanced two-step phase demodulation algorithm is proposed based on the orthogonality of diamond diagonal vectors. By performing the subtraction and the addition of two background-eliminated interferograms, respectively, two corresponding orthogonal vectors are constructed easily. Then, the measured phase and the phase shifts can be extracted from the elements and lengths of these orthogonal vectors. In addition to maintaining advantages of the known two-step algorithms, the proposed algorithm reveals significantly faster computing speed, better accuracy and the readily comprehensible physical picture of the orthonormalization algorithm. Both the simulation and the experimental results demonstrate the outstanding performance of the proposed algorithm. © 2015, Springer-Verlag Berlin Heidelberg. Source


Zhang W.,Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices | Zhang J.,Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices | Guo L.,Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices | Zhang Q.,Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2013

In order to analyze the mechanical properties of laser transmission welding of polycarbonate, the transparent and opaque polycarbonates were welded by a 10 W diode end pumped solid state laser, respectively. The microstructure, fracture appearance, micro-hardness and tensile-shear strength of the welded joint were tested by optical metallographic microscope (OM), field emission scanning electron microscope (SEM), micro-hardness tester and electronic universal tensile machine, respectively. The results showed that the joint gradually become as similar adhesive joint from welded joint with the increase of laser power density. Layering and pores in the welded joint are the defects to resulting in poor mechanical properties. The mechanical properties of the welded joint can be improved by controlling laser power density. At the laser power density of 0.23 J/mm2, the tensile-shear stresses reaches 44 MPa, which is 68% of that of the basic materials. The micro-hardness on the center of the welded joint is very close to the basic material. The fracture is the mixture of ductile fracture and brittle fracture. Source

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