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• W2023173107 abstract "Fiber optical hydrophone with high sensitivity attracts more and more attentions in recent years. In this paper, the packaging structures of the hydrophone are simulated based on ANSYS, finite element analysis software. Polyurethane is adopted to design a cylindrical hydrophone and an ellipsoidal hydrophone. By improving packaging structure of sensing-head, the acoustic sensing-index is increased. Experiment Results show that the sensitivity of hydrophone after packaging is 40 times of bare fiber. Keyword—hydrophone; acoustic pressure sensitivity; finite element I. PRINCIPLE As is known that, the relative shift of the Bragg wavelength of a FBG is related to the axial strain applied to the grating as follows [1]    ) 1 ( / e P    (1) Where e P is the effective photoelastic coefficient of the fiber glass with  the axial strain. The effective photoelastic coefficient e P is defined as: 2 / )] ( [ 12 11 12 2 P P v P n P eff e    (2) Where eff n is the effective refractive index of the guide mode with v the Poisson ratio, 11 P 、 12 P the photoelatic coefficient. For a typical silica fiber, 46 . 1  eff n , 16 . 0  v , 11 P =0.12, 27 . 0 12  P ,and, hence, we have 22 . 0  e P . And the axial strain  along the FBG under an applied pressure P is given by E P / ) 2 1 (      (3) Where  is the Poisson ratio of the polymer with E the Young’s modulus [2]. Combined formulas (1) and (3) E P Pe / ) 2 1 )( 1 ( /         (4) For the encapsulation structure of the hydrophone, the pressure sensitivity is related with the Poisson ratio and Young’s modulus of the polymer. The smaller the Poisson ratio and Young’s modulus, the higher the pressure sensitivity. II. FINITE ELEMENT SIMULATION BASED ON ANSYS Finite Element Method , FEM in short, is used more and more widely in recent years and becomes one of the most important ways to resolve computational mechanics. FEM is a method for dividing up a very complicated problem into small elements that can be solved in relation to each other. The finite element method [4] is a good choice for solving partial differential equations over complicated domains. ANSYS, based on finite element method, offers a comprehensive range of engineering simulation solution sets providing access to virtually any field of engineering simulation that a design process requires. In this paper, structural mechanics、modal analysis and harmonic analysis are adopted. A. Simulation of Young’s modulus and Poisson ratio An encapsulation structure model is established with diameter of 4mm, length of 50mm and density of 2200 kg/m. The mesh generation is automatic in ANSYS, and we use the method to generate 30672 nodes and 14998 elements as following Figure 1 Meshing in ANSYS The relationship between different Young’s modulus、 This project was supported by International S&T Cooperation Program of China (2012DFA10730). And we would like to thank Professor Gangding Peng and Doctor Xiaolei Zhang for their support and continuous guidance throughout our project. Proceedings of 2012 International Conference on Mechanical Engineering and Material Science (MEMS 2012) © 2012. The authors Published by Atlantis Press 697 different Poisson ratio and axial strain is given, respectively, as follows 0 500" @default.
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• W2023173107 date "2012-01-01" @default.
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• W2023173107 title "Simulation of High-Sensitivity Hydrophone Based on ANSYS" @default.
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• W2023173107 doi "https://doi.org/10.2991/mems.2012.97" @default.
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