Surveillance and Analysis of the Modal Components of Religious heritage through a mUltiphySics approach – SACRUS

The SACRUS project proposes the deployment of large-scale instrumentation of religious heritage in urban and rural areas in response to the societal challenge of preserving local heritage. The project is divided into two phases. The first involves assembling a network of low-cost velocimetric sensors with other sensors for measuring environmental parameters, and the second involves validating the sensors' effectiveness by comparing them with measurements using high-resolution velocimeters available in the laboratory. We also intend to compare methods based on vibration measurement (Operational Modal Analysis) with motion magnification by video processing, which is relevant when the structure is inaccessible for instrumentation. The second phase consists of deploying this low-cost technology on a dozen sites that are representative of some of the risks (associated with climate change or not) present in France. Eventually, we will offer online access to time series and modal characteristic extraction tools. The originality of the project also relies on strong interaction with the local population (school, town hall) and students of civil engineering and human sciences.