Study On The Performance Of Series Piezoelectric Sensor

Series piezoelectric sensor has the advantages of wide frequency band, high sensitivity, simple structure, low cost, and can be used in real time. It has been widely used in the analysis and testing. But series piezoelectric sensor response on the conductance exist a defect, that only under the condition of low conductivity (close to 0.01S/m), has high sensitivity, with an increasing in the electrical conductivity, the sensitivity decrease(more than 0.1 S/m frequency shift basically did not change), the disadvantages limited series piezoelectric sensor in high conductivity conditions (such as blood culture) development and application. Therefore, it is very important to explore the factors that affect the performance of the piezoelectric sensor and improve the sensitivity of the series piezoelectric sensor under the condition of high conductivity. The change of electrode shape and the change of the electrode surface will affect the electrical parameters of the electrode, thus affecting the performance of the series piezoelectric sensor. In this paper, we study how the conductance electrode shape and the electrode surface's changes affect piezoelectric sensor. In order to expand series piezoelectric sensor's sensitive range and provide a theoretical basis for the series piezoelectric sensor's further application. The main research work of this paper is as follows:1 The series conductance electrode with different shapes of series piezoelectric electric sensor resonant frequency AFs conductivity in potassium chloride solution concentration response curves, it is concluded that the conductance electrode shape changes and series piezoelectric sensor sensitive response range between contact. By using the Multiphysics COMSOL multi physical field simulation software, the electrostatic field distribution between different shapes of conductive electrodes was simulated and calculated. The proposed equivalent circuit model is derived the relationship between the intensity of electric field and the frequency of resonance, and successful shows the electric field between electrodes caused by changes in the electrode shape change is the result of the piezoelectric sensor sensitive response range of mobile.2 Research on interdigitated gold electrode surface modified with biological compatibility of nano materials (gold nanoparticles, carbon nanotubes. graphene) of piezoelectric sensor resonant frequency ?Fs conductivity in potassium chloride solution concentration response curves of the effect. The Multiphysics COMSOL multi physical field simulation software was used to simulate the change of the electric field strength of the nano materials modified with the cross finger gold electrode surface. The effect of the modified nanomaterials on the sensitivity of the piezoelectric sensor to the range of the piezoelectric sensor is derived by using the proposed equivalent circuit model.3 study in interdigital conductive polymer materials modified gold electrode surface of piezoelectric sensor resonant frequency AFs conductivity in potassium chloride solution concentration response curves of the effect. COMSOL multiphysical field simulation software was used to simulate the changes of the electric field strength of the conductive polymer materials modified by the cross finger gold electrode surface. Based on the proposed equivalent circuit model, the influence of the modified electrode polymer material on the sensitive range of the piezoelectric sensor is derived.