A method for accurately determining a density of a fuel includes obtaining dielectric constant versus density characteristics of the fuel at a first location and measuring a dielectric constant of the fuel at a second location. The environmental conditions at the second location differ from environm
A method for accurately determining a density of a fuel includes obtaining dielectric constant versus density characteristics of the fuel at a first location and measuring a dielectric constant of the fuel at a second location. The environmental conditions at the second location differ from environmental conditions at the first location. Density of the fuel at the second location is inferred using the dielectric constant of the fuel at the second location and the dielectric constant versus density characteristics of the fuel at the first location.
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1. An assembly used for determining a density of a fuel, the assembly comprising: a density sensor located at a first location, wherein the density sensor is configured to measure a density of the fuel at the first location;a first dielectric sensor located at the first location, wherein the first d
1. An assembly used for determining a density of a fuel, the assembly comprising: a density sensor located at a first location, wherein the density sensor is configured to measure a density of the fuel at the first location;a first dielectric sensor located at the first location, wherein the first dielectric sensor is configured to measure a dielectric constant of the fuel at the first location;a second dielectric sensor located at a second location downstream of the first location, wherein environmental conditions at the second location differ from environmental conditions at the first location and wherein the second dielectric sensor is configured to measure a dielectric constant of the fuel at the second location; anda fuel line connecting the first location to the second location;wherein the density of the fuel at the second location is inferred based on the measured density and dielectric constant at the first location, the measured dielectric constant at the second location, and dielectric versus density characteristics of the fuel at the first location. 2. The assembly of claim 1, wherein the dielectric constant versus density characteristics of the fuel at the first location are obtained in accordance substantially with the following expression: D=K-1A(K-1)+B where D is the density of the fuel, K is the dielectric constant of the fuel, and A and B are constants based on the type of fuel. 3. The assembly of claim 2, wherein obtaining the dielectric constant versus density characteristics of the fuel at the first location comprises: using the density measured at the first location as D in the expression andusing the dielectric constant measured at the first location as K in the expression;establishing a regression line for a plot of dielectric constant versus density based on measured values of density and dielectric constant at the first location; andselecting values of constants A and B as a function of the regression line. 4. The assembly of claim 3, wherein the density of the fuel at the second location is inferred by: using the measured dielectric constant of the fuel at the second location as the dielectric constant of the fuel K in the expression; andusing the selected values of constants A and B as the constants A and B in the expression. 5. The assembly of claim 1, wherein the environmental conditions at the first location include a temperature less than a temperature of the environmental conditions at the second location. 6. The assembly of claim 5, wherein the dielectric sensor at the second location comprises a gap between concentric electrode plates, and wherein the dielectric constant at the second location is measured by passing fuel from the first location through the gap. 7. The assembly of claim 1, wherein the first location is in a fuel tank external to an engine. 8. The assembly of claim 7, wherein the second location is at or near a fuel metering valve in the fuel line, wherein the fuel metering valve is within an engine. 9. The assembly of claim 8, wherein the determination of the density of the fuel at or near the fuel metering valve is used to adjust engine control. 10. The assembly of claim 7, wherein the second location is downstream of a fuel metering valve in the fuel line, wherein the metering valve is within an engine. 11. An assembly used for determining a density of a fuel, the assembly comprising: a density sensor located at a first location, wherein the density sensor is configured to measure a density of the fuel at the first location;a dielectric sensor located at the first location, wherein the dielectric sensor is configured to measure a dielectric constant of the fuel at the first location;a fuel line through which a fuel from the first location is passed, wherein the fuel line is located at least partially within an engine;a fuel metering valve located within the fuel line and configured to receive the fuel through a first end and dispel the fuel through a second end; anda multi-plate capacitor device located within the fuel line through which the fuel passes, the device comprising: a first current sensing electrode plate;a second voltage driven electrode plate configured concentrically around the first plate; andan insulating material configured concentrically between the first plate and the second plate, wherein the insulating material is present in an angular range between the first plate and the second plate less than 360° such that at least one gap is defined radially between the first plate and the second plate and along an axial distance of the first plate and the second plate, and wherein the at least one gap receives fuel at an upstream end and dispels fuel at a downstream end such that a first measurement of capacitance of the fuel can be obtained across the at least one gap. 12. The assembly of claim 11, wherein the device is configured such that the upstream end of the at least one gap receives fuel from the second end of the fuel metering valve. 13. The assembly of claim 11, wherein the at least one gap has a cross-sectional area at any axial location along the gap large enough to pass debris through and small enough to slow down a flow of fuel relative to a flow of fuel passing through the fuel line and bypassing the gap. 14. The assembly of claim 11, wherein the first location is a fuel tank located external to the engine and containing a portion of the fuel, wherein the density sensor and the dielectric sensors are located at least partially within the fuel tank, and wherein the fuel line is in fluid communication with the fuel tank to deliver fuel from the fuel tank to the fuel metering valve located within the fuel line. 15. The assembly of claim 11, further comprising environmental conditions at the multi-plate capacitor device which include a temperature greater than a temperature at the fuel tank and a pressure greater than a pressure at the fuel tank.
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이 특허에 인용된 특허 (5)
Ellinger S. Michael (Charlotte VT) Kline Bruce R. (Starksboro VT), Density determination of aircraft fuel based on the sensed temperature velocity of sound, and dielectric constant of the.
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