High sensitivity gravimetric sensor made of unidirectional carbon fiber epoxy composite on (1 -- x)Pb(Znl/3Nb2/3)O3-xPbTiO3 single crystal substrate |
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作者姓名: | 黄乃兴, 吕天全, 张锐, 曹文武 |
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作者单位: | [1]Condensed Matter Science and Technology Institute, Department of Physics, Harbin Institute of Technology, Harbin 150080, China; [2]Department of Physics, College of Electronic Science, Northeast Petroleum University, Daqing 163318, China; [3]Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA |
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基金项目: | Project supported by the National Basic Research Program of China (Grant No. 2013CB632900). |
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摘 要: | We have derived a general formula for sensitivity optimization of gravimetric sensors and have used it to design a high sensitivity gravimetric sensor using unidirectional carbon fiber epoxy composite (CFEC) waveguide layer on (1 -x)Pb(Znl/3Nbz/3)O3-xPbTiO3 (PZN-xPT) single crystal substrate with the carbon fibers parallel to the xj and x2 axes, respectively. The normalized maximum sensitivity (|sfm|λ)max exhibits an increasing tendency with the decrease of (h/λ)opt and the maximum sensitivity (|sfm|λ)max increases with the elastic constant c6E6 of the piezoelectric substrate material. For the CFEC/[011]c poled PZN-7%PT single crystal sensor configuration, with the carbon fibers parallel to the xa axis at λ = 24 ktm, the maximum sensitivity |sfm|max can reach as high as 1156 cmZ/g, which is about three times that of a traditional SiO2/ST quartz structure gravimetric sensor. The better design selection is to have the carbon fibers parallel to the direction of propagation of Love wave in order to obtain the best sensitivity.
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关 键 词: | 碳纤维环氧复合材料 高灵敏度 重量传感器 环氧树脂复合材料 单晶 衬底 单向 重力传感器 |
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