PROJECT TITLE :

A Method to Improve Sensitivity of Piezoresistive Sensor Based on Conductive Polymer Composite

ABSTRACT:

An electrical bridge system primarily based on differential structure is meant to enhance the sensitivity of compressive pressure sensor based on the piezoresistivity of conductive polymer composite. As the sensor works within the condition where all of the subsensing parts have to bear the same pressure, the classical “excitation-induced differential structure” (i.e., the properties of the subsensing elements are the identical, and they are arranged on the special positions in grips the reversed excitations) cannot be applied. To solve this problem, a “property-induced differential structure” (i.e., the subsensing elements are endowed with reversed properties by adjusting the mass ratio of conductive filler to polymer within the composite, and also the responses of them are opposite when the pressure exerted on them are the identical) is designed. If the mass ratio is lower/more than the crucial mass ratio, the destruction/formation result of the conductive network of the composite is dominant below compression, inducing that the changing tendency of the resistance of the element is consistent/opposite to that of the pressure. By using the subsensing parts with reversed properties because the arms of a bridge, the pressure is converted to output voltage. The experimental results verify the feasibility of using the bridge system based on the “property-induced differential structure” to improve the sensitivity.


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