A sensor device for electric field measurement based on piezoelectric bending effect

Abstract

The invention relates to an electric field measurement sensing device based on the piezoelectric buckling effect and belongs to the technical field of electric field sensing. According to the device, two piezoelectric fiber layers with opposite directions of polarization are stacked together, the stacked piezoelectric fiber layers are bonded with an upper electrode layer to form an upper capacitance polar plate, a reference layer is bonded with a lower electrode layer to form a lower capacitance polar plate, the two ends of the upper capacitance polar plate and the two ends of the lower capacitance polar plate are fixed between a left clamping and fastening part and a right clamping and fastening part, and the two input ends of an impedance measurement device are connected with the upper electrode layer and the lower electrode layer respectively. According to the device, stretching deformation is converted into directional bending deformation through end fastening by means of the piezoelectric effect of the piezoelectric fiber layers, and the parallel capacitance formed by bending the piezoelectric fiber layers and the reference layer is measured to reflect the intensity of the electric field. The device is high in capacitance response sensitivity, high in temperature stability and wide in measurement range and is a high-performance, low-cost, safe and reliable electric field sensor for an intelligent monitoring system.

Description

technical field [0001] The invention relates to an electric field measuring and sensing device based on piezoelectric bending effect, belonging to the technical field of electric field sensing. Background technique [0002] Intelligent monitoring systems have broad application prospects in both industrial and civil fields. However, limited by the level of sensor technology, intelligent monitoring systems are only limited to some industrial occasions at this stage, and large-scale applications cannot be realized. Due to the limited measurement range and measurement accuracy of traditional voltage sensors, large volume and high cost, they cannot meet the industrial and civil needs for easy installation, convenient maintenance, and safety and reliability of wide-area distributed sensor nodes, which greatly limits the application process of intelligent monitoring systems. . [0003] The emergence of integrated electric field sensors provides strong support for the realization o...

AI Technical Summary

Problems solved by technology

However, piezoelectric materials have not been deeply developed in the research of electric field sensing. The main limitation is that it is difficult to accurately measure the deformation or stress of materials under the electric field, and direct measurement methods such as precision instruments cannot be used practically. conversion) indirect measurement of material deformation or stress

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