Composite structures are strong and light weight, and have great potential in enhancing the structural strength of Unmanned Air Vehicles (UAVs). In this research, we present some preliminary results of structural health monitoring (SHM) for composite structures using an unpowered wireless ultrasound system. First, we have built a testbed, which consists of ultrasonic sensors, composite specimens, and data acquisition electronics. Second, we have performed extensive experiments to collect data. An 8-sensor array was used to detect and localize defects in composite plates. Third, we have implemented defect detection and localization algorithms. We have shown that, with an 8-sensor array, we can detect and localize small defects. Fourth, we have performed an experiment to demonstrate that wired and wireless data matched well both in time domain and in frequency domain.
Wireless communication;Ultrasonic imaging;Wireless sensor networks;Surface acoustic waves;Sensor phenomena and characterization;Monitoring