Non-Contact Liquid Level Measurement Using the Talbot Effect and Adaptive Photodetectors

Measuring liquid levels inside containers is a crucial task in various industrial and scientific processes. Numerous methods have been proposed for this purpose, with some of the most widely used methods relying on capacitive [1], electromagnetic [2], acoustic [3], and ultrasound phenomena [4], as well as optical fibers [5]. However, many of these methods require the transducers or sensors to be attached to the container, or in some cases, even immersed in the liquid, limiting their applicability in specific fields like pharmaceuticals, food processing, analytical chemistry, and clinical testing.