Test dinamici con una nuova generazione di accelerometri

Real-time control of civil structures is vital for territory safety and preservation. The actual utilization possibilities of these new generation optical-fiber accelerometers, based on Moiré phenomenon, have been investigated within the context of the experimental researches carried out by the laboratory of Civil and Environmental Engineering Department in UCIrvine. The physical analysis of the accelerometer leads to the initial configuration of a digital algorithm conceived for the real time with the aim to eliminate the physical lacks of the sensor itself. The actual application of the optical-fiber sensor is verified by means of dynamic tests on vibrating table, carried out on a building model. After dynamic identification and damage introduction, damage detection is carried out. It is finally set up a vibration monitoring of an existing bridge in South Korea. The dynamic data acquisitions relevant to this new sensor are then compared with data derived from other valid reference accelerometers. This new generation of accelerometers is essentially comparable with the other generations already on the market and the accelerometer signal has a high resolution and doesn't practically contain any interference. The definition of the vibration modes and the damage detection are then made easy. These sensors are particularly fit for applications where electromagnetic noise does massively distort the signals.