FILLING LEVEL MONITORING DEVICE FOR MONITORING THE FILLING LEVEL OF A FLUID CONTAINER, HYDROGEN TANK, AND AIRCRAFT COMPRISING SUCH HYDROGEN TANK

原文（中文）

A filling level monitoring device includes an exciting element, first and second sensors, a signal source, and a processor. The exciting element can be mounted to the fluid container. The first and second sensors can be mounted to the fluid container at opposite sides. The signal source is connected to the exciting element and can generate an input signal including frequency components. The first and second sensors are each connected to the processor to sense vibrations within the fluid container and to generate and send corresponding vibration signals to the processor. The processor can determine a horizontal vibration mode from the vibration signals of the first and second sensors and the input signal, to determine a modal frequency of the determined horizontal vibration mode, and to determine a current filling level of the fluid container based on the modal frequency of the determined horizontal vibration mode.