Patent ID: 6588269
Filing Date: 2003-07-08
Classification: G01F

Abstract:
A device for measuring liquid level, comprising at least one detection assembly (Si) comprising at least a piezoelectric cell adapted to serve as a reference cell and a piezoelectric cell adapted to serve as a level measurement cell, the cells being associated with control means for emitting ultrasound waves respectively opposite a reference reflector, situated a known distance (D) from the associated cell on the one hand, and from the upper surface of the liquid on the other hand, and processing means able to determine the level of liquid by utilizing the respective times of propagation of the ultrasound waves emitted by each of these two cells, further comprising a means to define, after the device is switched on, an initialization phase during which the control means operate the piezoelectric cells in such a way that the ratio of the rate of excitation of the reference cell to that of the level measurement cell is greater than the ratio of the rate of excitation of the reference cell to that of the level measurement cell during a stabilized subsequent measurement phase.