Related Experiment Video
Updated: May 18, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
Published on: September 30, 2019
A synchronized multipoint vision-based system for displacement measurement of civil infrastructures
Hoai-Nam Ho1, Jong-Han Lee, Young-Soo Park
1Department of Civil and Environmental Engineering, Sejong University, Seoul 143-747, Republic of Korea.
Abstract:
This study presents an advanced multipoint vision-based system for dynamic displacement measurement of civil infrastructures. The proposed system consists of commercial camcorders, frame grabbers, low-cost PCs, and a wireless LAN access point. The images of target panels attached to a structure are captured by camcorders and streamed into the PC via frame grabbers. Then the displacements of targets are calculated using image processing techniques with premeasured calibration parameters. This system can simultaneously support two camcorders at the subsystem level for dynamic real-time displacement measurement. The data of each subsystem including system time are wirelessly transferred from the subsystem PCs to master PC and vice versa. Furthermore, synchronization process is implemented to ensure the time synchronization between the master PC and subsystem PCs. Several shaking table tests were conducted to verify the effectiveness of the proposed system, and the results showed very good agreement with those from a conventional sensor with an error of less than 2%.
Related Concept Videos
Design Example: Measuring Distance Between Two Points with Obstructions
Differential Leveling
Position and Displacement
Position and Displacement
Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device
Distance Corrections
