Acceleration measurement is widely employed, because acceleration sensors generally have low noise and cost effective. To determine cable tension, FFT analysis of measured acceleration data is widely used. This study proposes a stay cable measurement system using acceleration data to determine the cable tension and vibration amplitude. A small light-weight wireless sensor is also proposed to increase the applicability.

A video-based non-contact remote displacement measurement system is proposed and developed. The system captures images of the structure and analyzes the image to determine the displacement. Multi-thread computing and adaptive region of interest method is implemented in the system to compute the displacement in real-time. Field test on a real structure has been carried out to evaluate the performance and verify the reliability of the system.