Sensing characteristics of mechanical sensor made with PPy

SHANG Xingliang, WANG Xiangjiang

(School of Mechanical Engineering, University of South China, Hengyang 421001, China)

Abstract: Aiming at the application of PPy(polypyrrole) in the sensor, the sensing characteristics of the PPy mechanical sensor were studied. A method to measure the weak electric output signal of the sensor was presented under the condition of external static deflection applied, and the output signal measuring system was established with the function of shielding external disturbance.PPy sensor was applied by two sets of deflection displacements,the former values changed from small to large, the latter from large to small,then the corresponding sensor output signals were obtained in the shielding of external interference, by analyzing the relationship between the input deflection displacement and sensor output voltage, complete PPy sensor output characteristic curve equation of Togo and backhaul was gotten. The results indicate that the measurement system can achieve the output voltage signal of PPy mechanical sensor in the state of static deflection，and the sensor output keeps in line with the change of the input basically. Nonlinear hysteresis phenomena exists in the process of sensing according to the characteristic curve equation.The result provides a certain experimental basis and reference for the production of PPy mechanical sensor.

Key words: polypyrrole; donnan equilibrium; shielding interference; sensing characteristics