The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 03, 2006
Filed:
Feb. 09, 1993
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);
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);
Hughes Aircraft Company, Los Angeles, CA (US);
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.