Measuring and testing – Volumetric content measuring
Patent
1990-05-25
1993-11-16
Yasich, Daniel M.
Measuring and testing
Volumetric content measuring
73290V, 324668, 364509, 367908, G01F 2322
Patent
active
052612740
ABSTRACT:
This instrument contains a transducer and a sensor that are mounted on the exterior surface of a liquid container or tank. The transducer is tuned by electronic signals to the mechanical resonant frequency of the liquid container or tank. The sensor converts the mechanical vibrations into dynamic electrical signals using electronic components. A phase detector and feedback circuitry force the transducer to track the resonant frequency of the tank as liquid is removed from the tank. The signal output of the feedback control circuitry is converted to display the amount of liquid remaining in the tank. The resonant frequency of the liquid container is a measure of the total mass of the container. This includes the tare weight of the container plus the weight of the liquid in the tank. The tare weight of the tank is a constant. The stiffness of the tank can be considered a constant. The dampening coefficient changes do not adversely effect the accuracy requirements of the instrument. Therefore, the change in resonant frequency of the tank as liquid is removed is nonlinear, but is an analytic function of the liquid remaining in the tank. Zero and span adjustments eliminate the effect of the constants and permit one design to satisfy many requirements. At resonance the amplitude response of the tank is much larger than the noise of the environment. As the intelligence of the instrument to interpret changes in liquid volume is a function of frequency, this adds to the noise immunity. The nonlinear dynamic response of the instrument is an asset in the use of this gauge for fuel tanks and other applications.
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Nemirow Daniel M.
Yasich Daniel M.
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