ACOUSTIC DEVICE, LIQUID GAUGE PROBE EQUIPPED WITH SUCH A DEVICE, AND LIQUID GAUGE SYSTEM PROVIDED WITH SUCH A PROBE

摘要

The invention relates to a gauging probe provided with an acoustic device for a system for gauging a liquid, in particular for measuring the height of the fuel in the tank of an airplane. The ultrasonic probe (101) comprises a stilling well (110) mounted in the tank and an acoustic device (111) mounted to the lower end of the stilling well. The acoustic device comprises a piezoelectric element having a flat upper surface (112) and a lower surface (113) which is profiled so that it has a different thickness at different points of its width. In this way, the piezoelectric element has several resonance frequencies and information can be extracted using frequency domain techniques. A control and processing unit (103) is connected to the piezoelectric element (111). / P