Wireless Vibration Sensor for Tunnel Construction

To measure the volume of earth on the barge accurately and efficiently, a systemwas developed for accepting earth using digital cameras. The developed systemhas been applied at actual sites. The system measures the volume of earth on the barge using the technique of aerial photogrammetry. Stereo images are taken by two digital cameras that are installed above the hold of the barge. The images are subjected to stereo matching using personal computers to obtain the three-dimensional shape of the surface of the earth loaded on the barge and calculate the volume of the earth. This paper describes the principle of measurement, provides a system overview and reports the results of verification of system accuracy.