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As one of the main components of polyvinylidene fluoride (PVDF) piezoelectric sensor, the equivalent capacitor of PVDF will influence the electrical signal output when subjected to the impact load, thus influencing the accuracy of its measurement. However, in previous research, the equivalent capacitor of PVDF and its possible influence on measurement results are usually ignored. In this paper, by changing the external resistance, the influence of the equivalent capacitor of PVDF on its electrical signal output characteristics when subjected to impact load is studied. The results show that at this time, the charge generated by PVDF will be partially concentrated on the equivalent capacitor, and the amount of concentration is determined by the impact load characteristics, external resistance and equivalent capacitance. Therefore, in some cases, it is unreasonable to ignore the equivalent capacitor in previous research, which may lead to some errors, and even get completely wrong results. Considering the charge concentrated on the equivalent capacitor can effectively avoid the problems of conventional methods, and reflect the applied impact load more accurately. In addition, to improve the accuracy of the measurement, on the basis of quantitative evaluation of the influence of equivalent capacitor on electrical signal output, this paper put forward a design method of the test circuit, that is, for different types of impact load and measurement accuracy requirements, PVDF with appropriate capacitance and the reasonable external resistance should be selected. The research in this paper is helpful to the impact load measurement of PVDF, and will improve the accuracy of the measurement to a certain extent.
Xing Huang; Qiyue Li; Xiaomu Liao; Xiang Zhang; Haideng Zeng; Xin’Ao Wei; Jingbo Wang. Equivalent capacitor of polyvinylidene fluoride sensor and its influence on impact load measurement. Smart Materials and Structures 2021, 1 .
AMA StyleXing Huang, Qiyue Li, Xiaomu Liao, Xiang Zhang, Haideng Zeng, Xin’Ao Wei, Jingbo Wang. Equivalent capacitor of polyvinylidene fluoride sensor and its influence on impact load measurement. Smart Materials and Structures. 2021; ():1.
Chicago/Turabian StyleXing Huang; Qiyue Li; Xiaomu Liao; Xiang Zhang; Haideng Zeng; Xin’Ao Wei; Jingbo Wang. 2021. "Equivalent capacitor of polyvinylidene fluoride sensor and its influence on impact load measurement." Smart Materials and Structures , no. : 1.
Liquid carbon dioxide phase change fracturing technology (LCPCFT) has been widely used in engineering blasting due to the advantage of no flames, and no toxic and harmful gas. However, few studies have been conducted on the acquisition of shock wave pressure and its loading characteristics, which are key parameters in fracturing. Referring to the CO2 in-situ fracturing technology, an indoor test system for shock wave pressure generated during LCPCFT has been built, with a protected polyvinylidene fluoride (PVDF) piezoelectric sensor. Then three verification experiments with different radial distances between the fracturing tube and test points were carried out on the test system, and in each experiment, four PVDF sensors as four test points were arranged with different axial distance from the detonating point to test the pressure distribution. The experimental results show that when the radial distance between the fracturing tube and test points is not too large (≤345 mm), the pressure generated during LCPCFT is approximately uniformly distributed within the axial length of the fracturing tube, but when it is relatively large (≈895 mm), the results between different test points are in a certain degree of dispersion. And finally, this paper uses the intraclass correlation coefficient (ICC) and coefficient of variation (CV) of peak pressure and impulse to process the test results to evaluate the reliability and stability of the test system. Evaluation results show that the test results are in good consistency. The test system in this paper has good stability and high reliability. The test system provides a useful tool for accurately obtaining the shock wave pressure, which is helpful for further research on LCPCFT.
Xing Haung; Qiyue Li; Xin’Ao Wei; Xiaoxiao Yang; Dayou Luo; Haideng Zeng; Hongwei Wang. Indoor Test System for Liquid CO2 Phase Change Shock Wave Pressure with PVDF Sensors. Sensors 2020, 20, 2395 .
AMA StyleXing Haung, Qiyue Li, Xin’Ao Wei, Xiaoxiao Yang, Dayou Luo, Haideng Zeng, Hongwei Wang. Indoor Test System for Liquid CO2 Phase Change Shock Wave Pressure with PVDF Sensors. Sensors. 2020; 20 (8):2395.
Chicago/Turabian StyleXing Haung; Qiyue Li; Xin’Ao Wei; Xiaoxiao Yang; Dayou Luo; Haideng Zeng; Hongwei Wang. 2020. "Indoor Test System for Liquid CO2 Phase Change Shock Wave Pressure with PVDF Sensors." Sensors 20, no. 8: 2395.