Multiplexed resistive sensing of polymer-based gaskets under varied mechanical stress and temperature

Abstract

This thesis presents the development of a multiplexed resistive sensing system based on polydimethylsiloxane–carbon nanotube composites for monitoring polymer gaskets under mechanical and thermal stimuli. The system integrates electrical multiplexing, custom circuit prototype, and data acquisition hardware to enable spatially resolved measurements. A graphical interface was implemented for real-time data capture and visualization. Experimental results showed that the composite exhibited changes in resistance under pressure variation ranging from 0 torr to 760 torr, indicating piezoresistive behavior. As the temperature increased, the resistance decreased, indicating a negative temperature coefficient behavior. Additionally, localized mechanical forces produced measurable resistance increases, proportional to the applied force. These results demonstrate the system’s effectiveness in detecting pressure, temperature, and point force stimuli across multiple locations. The combination of material behavior and system integration supports its suitability for use in monitoring and flexible sensing applications.