A broadband structure-borne sound sensor is a device used to detect and measure mechanical vibrations in a structure or other material. It is typically used to measure vibrations in buildings, bridges, or other large structures. The sensor works by detecting vibrations in the structure, which are converted into electrical signals that can be measured and analyzed. The sensor can be used for a variety of purposes, such as monitoring the structural health of buildings and bridges, detecting structural faults, and detecting and distinguishing between different types of sounds.