Sonic pressure volume measuring device
First Claim
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1. A device for measuring the volume of gases in a rigid-walled container of known size and comprising:
- first transducer means mounted in a wall of the container for providing cyclic pressure waves in said gases;
second transducer means for sensing said cyclic pressure waves and providing a sensing signal in response to the instantaneous values of the pressure thereof;
logic means coupled to the second transducer means for translating the sensing signal into a function of gas volume in the container and including detector means for providing a first D.C. signal in response to the amplitude of the sensing signal, first reference means for providing a first D.C. reference signal proportional to the force applied to the first transducer means, second reference means for providing a second D.C. reference signal determined by the maximum volume of said container, and third reference means for providing a third D.C. reference signal for establishing a zero gas volume setting.
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Abstract
The volume of gases in a container or the volume of liquid in the container is determined by creating cyclic pressure waves in the gases and detecting the waves by a second transducer. The signals produced by the second transducer are a function of the volume of gas in the container, and the volume of any liquid can be obtained by simple calculation. The signals can also provide detection of an open container and, when coupled to signals relating to the velocity of a vehicle, can provide other data such as a miles-per-gallon reading.
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Citations
7 Claims
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1. A device for measuring the volume of gases in a rigid-walled container of known size and comprising:
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first transducer means mounted in a wall of the container for providing cyclic pressure waves in said gases; second transducer means for sensing said cyclic pressure waves and providing a sensing signal in response to the instantaneous values of the pressure thereof; logic means coupled to the second transducer means for translating the sensing signal into a function of gas volume in the container and including detector means for providing a first D.C. signal in response to the amplitude of the sensing signal, first reference means for providing a first D.C. reference signal proportional to the force applied to the first transducer means, second reference means for providing a second D.C. reference signal determined by the maximum volume of said container, and third reference means for providing a third D.C. reference signal for establishing a zero gas volume setting. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification