Micro electro‐mechanical devices used as vibration sensors. Measurements and comparison with traditional accelerometers

摘要

The aim of the project is to verify the applicability of MEMS wireless accelerometers torninvestigate oscillatory phenomena that can jeopardize the safety of structural elements andrnhow these devices can perform environmental monitoring campaigns of vibrationrnmeasurements. This to obtain a prototype sensor which data can be compared with thosernmeasured using traditional systems to detect the accelerations (seismic piezoelectricrnaccelerometers).rnIn the first part of the project, the development of a computer code, necessary for thernoperation of the accelerometer and to allow its data transmission was carried out. Afterrnthis, a calibration curve was produced by which it is possible to associate to each voltagernvalue read from the instrument a corresponding acceleration value in physical units (mg orrnms‐2). Then laboratory tests were conducted to study the behavior of the instrumentationrnoperating in particular situations (i.e. progressive exhaustion of the batteries and therninfluence that the residual value of voltage has on the initial value of "offset”). To concludernhas been made a measurement on bridge "P. Bucci" located at the University of Calabriarncreating a small network of sensors placed along the bridge. The results were thenrncompared to the same samples using traditional accelerometers.