High sensitivity gravimetric sensor made of unidirectional carbon fiber epoxy composite on (1-x)Pb(Z

• 作 者: 黄乃兴 吕天全 张锐 曹文武
• 机 构: Condensed Matter Science and Technology Institute, Department of Physics, Harbin Institute of Techno
• 出 处: Chinese Physics B
• 发表日期: 2014年11期
• 关键词: gravimetric Nb Zn x)Pb unidirectional waveguide piezoelectric normalized epoxy q

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(Zn1/3Nb2/3)O3-xPbTiO3(PZN-xPT) single crystal substrate with the carbon fibers parallel to the x1 and x2axes, respectively. The normalized maximum sensitivity Sfm λ maxexhibits an increasing tendency with the decrease of(h/λ)optand the maximum sensitivity Sfm λ maxincreases with the elastic constant cE66 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 x1 axis at λ = 24 μm, the maximum sensitivity Sfm maxcan reach as high as 1156 cm2/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.

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 (Zn1 / 3Nb2 / 3) O3- The normalized maximum sensitivity Sfm λ maxexhibits an increasing tendency with the decrease of (h / λ) optand the maximum sensitivity Sfm λ maxincreases with the xPbTiO3 (PZN-xPT) single crystal substrate with the carbon fibers parallel to the x1 and x2axes, respectively. elastic constant cE66 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 x1 axis at λ = 24 μm, the maximum sensitivity Sfm maxcan reach as high as 1156 cm2 / g, which is about three times that of a traditional SiO2 / ST quartz structure gravimetric sensor. The better design selection to to the carbon fibers parallel to the direction of propagation of Love wave in order to obtain the best sensitivity.