Non-invasive technologies for measuring the level of liquids in containers and vessels are of great interest to various industrial sectors, including the food industry. In fact, most commercial solutions use invasive techniques, which are not always compatible with the conditions and/or quality of the products contained within the equipment.

In this context, the aim of a recent study carried out by a group of US researchers (Palanisamy et al., 2024) was to develop a new portable and non-invasive technology to perform this measurement. This technology is based on the analysis of the diffusion of acoustic waves through the walls of the container and their interactions with the liquid content to determine the optimal separation distance of the sensors and the characteristics of the excitation signal, thus obtaining a highly accurate and precise level measurement.