If you are interested in an effective, non-invasive, real-time and low cost assessment of the static and dynamic structural behavior of civil infrastructures and historical monuments, aimed at the evaluation of their health status and to plan actions for their long-term preservation and to reduce the risks for the population, the Monolite class of monolithic sensors is the state-of-the-art in the field.
Based on the UNISA Folded Pendulum technological platform, Monolite sensors are designed for the implementation of modular permanent non-invasive real-time distributed monitoring of historical monuments.
The Monolite sensors, modularly configurable as seismometers, velocimeters and accelerometers, are characterized by large band in the low frequency (10-6÷ 1 kHz) and high sensitivity (< 10-11 m/√Hz), fully customizable according to specific requirements.
Their large band guarantees an effective monitoring also of the very low frequency structural resonance modes (1 mHz < fr < 1 Hz) together with the site slow motion and subsidence to which the structure is integral (down to 1μ Hz), including the night and day insulation that may produce slow structural motion characterized by a low resonance frequency (fo ≈ 0.01 mHz).
Their high sensitivity guarantees the acquisition of their dynamical behaviour also when the structures are not forced by high intensity forces (e.g. earthquakes, etc.), generally for very limited periods or time, since the high signal to-noise of the acquired signal allows the measurement of their response all the time, in presence of low forcing due to low intensity environmental noise sources (micro-seismic noise, wind, etc.) and/or by anthropic ones (car traffic, etc.).
In the Monolite class, the characteristic of broadband and sensitivity are coupled with characteristics of high directivity, robustness, compactness (down to 5 cm size) and light weight (down to 40 g), including the possibility of their direct application in UHV (ultra-high-vacuum) and cryogenic conditions.