Inventors:
Kenn S. Bates - Long Beach CA, US
Kenneth M. Kunz - Northridge CA, US
Barton H. Rowlett - Rancho Palos Verdes CA, US
David B. Chang - Tustin CA, US
Assignee:
Hughes Aircraft Company - Los Angeles CA
International Classification:
G01F 17/00
G01F 23/18
Abstract:
An adiabatic liquid volume sensor system is described, which employs a main chamber in a back-to-back configuration with a reference chamber of known volume. The system measures liquid volume in the main chamber by making low frequency acoustic measurements of the acoustic pressure differences in the two closed chambers when driven with a sinusoidal frequency from the same speaker. Pressure transducers in each chamber measure acoustic adiabatic pressures in each chamber. The ratio of these pressures multiplied by the known volume of the reference chamber yields the volume of gas in the main chamber. The volume of liquid is equal to the known volume of the main chamber minus the calculated gas volume.