Experts were looking for alternative measurement options for smaller scale blasting. "As part of the research project, we built a new three-axis fibre-optic sensor for measuring vibrations generated during blasting operations," says Jakub Čubík from the Faculty of Electrical Engineering and Computer Science.
The new sensor is innovative thanks to the use of optical fibres, whereas electrical devices are commonly used in practice. "We can stretch the optical fibre anywhere and we don't need a source of electricity at the point of measurement, which is a huge advantage. In many places where blasting is carried out, the use of electricity is very problematic," Jakub Čubík recalls.
The new type of sensor has already been tested experimentally at Subterra's construction sites in Sweden, and measurements have also been made at the construction site of Prague's Metro D, at a limestone quarry in Štramberk, and during the construction of a new tram line in Brno-Zabovřesky. During these experimental tests in populated areas, the frequency and amplitude of vibrations and their effect on the surrounding buildings and inhabitants were monitored.
Scientists from the Department of Telecommunication Engineering, Jan Nedoma, Jakub Čubík, Stanislav Kepák and Martin Stolárik from the Faculty of Civil Engineering worked on the project Monitoring of small and large scale blast parameters with fibre optic sensors for VSB-TUO.