A liquid level measuring device, a method for measuring the fuel volume in an aircraft fuel tank, and an aircraft

Abstract

This application discloses a liquid level measuring device, a method for measuring fuel volume in an aircraft fuel tank, and an aircraft, belonging to the field of fuel volume measurement technology. The liquid level measuring device includes: a first electrode group comprising multiple first electrodes spaced apart along a circumferential direction; and a second electrode group disposed outside the first electrode group, comprising multiple second electrodes spaced apart along a circumferential direction, with the first electrodes and at least one second electrode positioned opposite each other. By utilizing the capacitance formed between the first and second electrode groups, the liquid level height and liquid surface angle are measured, reconstructing the liquid surface shape in the aircraft fuel tank and improving the accuracy of fuel volume measurement.

Description

Technical Field

[0001] This application relates to the field of fuel volume measurement technology, and in particular to a liquid level measuring device, a method for measuring the fuel volume of an aircraft fuel tank, and an aircraft. Background Technology

[0002] The accuracy of aircraft fuel quantity measurement is one of the important indicators for measuring aircraft safety and economy. The type, selection, and arrangement of sensors directly determine the accuracy of fuel measurement.

[0003] In related technologies, civil aircraft typically use capacitive sensors with a coaxial cable-like structure to measure fuel level. However, due to the influence of the aircraft's flight attitude, the fuel level in the tank undergoes strong dynamic changes, leading to a decrease in the accuracy of fuel level measurement. Summary of the Invention

[0004] This application provides a liquid level measuring device, a method for measuring the fuel volume in an aircraft fuel tank, and an aircraft, in order to solve the technical problem that the liquid level in the fuel tank will have strong dynamic changes due to the influence of the aircraft's attitude, which leads to a decrease in the accuracy of fuel quantity measurement.

[0005] In a first aspect, embodiments of this application provide a liquid level measuring device for measuring the volume of fuel in an aircraft fuel tank. The liquid level measuring device includes: The first electrode group includes a plurality of first electrodes spaced apart along a circumferential direction. The second electrode group is disposed outside the first electrode group. The second electrode group includes a plurality of second electrodes spaced apart along the circumferential direction. The first electrode is disposed opposite to at least one second electrode. The first and second electrodes, which are arranged adjacent to each other, form a capacitor. The capacitance value of the capacitor is configured to reconstruct the shape of the fuel level in the aircraft fuel tank.

[0006] In some embodiments, a plurality of first electrodes are uniformly distributed along the circumferential direction; Multiple second electrodes are evenly distributed along the circumference.

[0007] In some embodiments, the second electrode corresponds one-to-one with the first electrode, and the corresponding first electrode and second electrode constitute a capacitor.

[0008] In some embodiments, the liquid level measuring device further includes: The shielding layer is located on the outside of the second electrode assembly.

[0009] In some embodiments, the first electrode group further includes a first carrier layer, and the first electrode is disposed on the first carrier layer; The second electrode group also includes a second carrier layer, which is disposed on the outside of the first electrode group, and the second electrode is disposed on the second carrier layer.

[0010] In some embodiments, two capacitors disposed opposite each other in a radial direction in the circumferential direction constitute a capacitor pair.

[0011] In some embodiments, the capacitor pairs are arranged in at least two different radial directions in the circumferential direction.

[0012] In some embodiments, the capacitor pairs are arranged along the aircraft's heading and along the aircraft's lateral heading.

[0013] Secondly, embodiments of this application also provide a method for measuring the volume of fuel in an aircraft fuel tank. The method is based on the liquid level measuring device described in the first aspect and includes the following steps: The liquid level height and liquid surface inclination angle can be obtained from the capacitance value of the capacitor. Reconstruct the liquid surface shape based on the liquid level height and liquid surface inclination angle; The fuel volume is determined based on the pre-defined fuel tank structure and fuel surface shape.

[0014] In some embodiments, the steps of obtaining the liquid level height and liquid surface tilt angle based on the capacitance value include: Based on the mapping relationship between capacitance value and liquid level height, the liquid level height corresponding to each capacitance value is obtained.

[0015] In some embodiments, the steps of obtaining the liquid level height and liquid surface tilt angle based on the capacitance value include: The liquid surface tilt angle can be obtained from the capacitance value of the capacitor pair.

[0016] In some embodiments, the step of obtaining the liquid surface tilt angle based on the capacitance value of the capacitance pair includes: The liquid surface tilt angle is obtained by mapping the change in capacitance between the two capacitors in the capacitor pair to the liquid surface tilt angle. In some embodiments, the step of reconstructing the liquid surface shape based on the liquid level height and the liquid surface tilt angle includes: Reconstruct the shape of a liquid surface based on the liquid level height and the liquid surface inclination angle. Reconstruct the shape of the liquid surface of a region based on multiple liquid surface shapes.

[0017] Thirdly, embodiments of this application also provide an aircraft that includes the liquid level measuring device described in the first aspect.

[0018] This application uses the capacitance formed between the first and second electrode groups to obtain the liquid level height and liquid surface tilt angle, thus reconstructing the liquid surface shape in the aircraft fuel tank. The reconstructed liquid surface shape is closer to the actual state of the fuel level in the tank, thereby improving the measurement accuracy of the liquid level height and liquid surface tilt angle, and improving the accuracy of fuel volume measurement. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0021] Figure 1 This is a schematic diagram of a first structure of a liquid level measuring device provided in an exemplary embodiment of the present disclosure; Figure 2 This is a second structural schematic diagram of a liquid level measuring device provided in an exemplary embodiment of the present disclosure; Figure 3 A schematic diagram of the structure of the first electrode group of a liquid level measuring device provided in an exemplary embodiment of this disclosure; Figure 4 A schematic diagram of the structure of the second electrode group of a liquid level measuring device provided in an exemplary embodiment of this disclosure; Figure 5 A top view of a liquid level measuring device provided in an exemplary embodiment of this disclosure; Figure 6 A flowchart illustrating a method for measuring the fuel volume of an aircraft fuel tank, provided as an exemplary embodiment of this disclosure; Figure 7 A flowchart of step S101 of a method for measuring the fuel volume of an aircraft fuel tank, provided as an exemplary embodiment of this disclosure; Figure 8 A top view of a liquid level measuring device used in a method for measuring the fuel volume of an aircraft fuel tank, provided as an exemplary embodiment of this disclosure; Figure 9 A simulation diagram illustrating a method for measuring the fuel volume of an aircraft fuel tank, provided as an exemplary embodiment of this disclosure; Figure 10 A simulation result curve of a method for measuring the fuel volume of an aircraft fuel tank, provided as an exemplary embodiment of this disclosure.

[0022] Explanation of icon numbers: 100, First electrode group; 101, First electrode; 102, First carrier layer; 200, Second electrode group; 201, Second electrode; 202, Second carrier layer; 300, Shielding layer. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0024] In the embodiments of this application, "at least one" refers to one or more, and "multiple" refers to two or more. In the description of this application, the terms "first," "second," "third," etc., are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0025] References such as “one embodiment” or “some embodiments” as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the terms “comprising,” “including,” “having,” and variations thereof, as used in this specification, mean “including, but not limited to,” unless otherwise specifically emphasized.

[0026] It should be noted that in the embodiments of this application, "and / or" describes the relationship between associated objects, indicating that there can be three relationships. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects before and after it are in an "or" relationship.

[0027] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, "A and B are connected" can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0028] It should be noted that the aircraft's heading is the direction from back to front along the intersection of the aircraft's plane of symmetry and the horizontal plane when the aircraft is in level flight. The aircraft's lateral heading is the direction perpendicular to the aircraft's heading and pointing towards the right wing on the horizontal plane when the aircraft is in level flight.

[0029] Descriptions involving direction, such as terms like "forward," "backward," "upward," and "downward," are based on the aircraft's orientation during normal flight. For example, "forward" refers to the direction close to the nose in the aircraft's heading, "backward" refers to the direction close to the tail in the aircraft's heading, "left" refers to the direction close to the left wing in the aircraft's lateral direction, and "right" refers to the direction close to the right wing in the aircraft's lateral direction. "Upward" refers to the vertical direction, and "downward" refers to the vertical direction.

[0030] During different flight phases, such as takeoff, climb, or descent, the fuel level will tilt. Because traditional capacitive sensors struggle to accurately capture these strong dynamic changes in the fuel level, the accuracy of fuel volume measurement is reduced.

[0031] In a first aspect, embodiments of this application provide a liquid level measuring device, such as... Figure 1 As shown.

[0032] The liquid level measuring device includes a first electrode group 100 and a second electrode group 200.

[0033] The first electrode group 100 includes a plurality of first electrodes 101 spaced apart along a circumferential direction. The second electrode group 200 is disposed outside the first electrode group 100. The second electrode group 200 includes a plurality of second electrodes 201 spaced apart along a circumferential direction. The first electrodes 101 are disposed opposite to at least one second electrode 201.

[0034] An adjacent and oppositely positioned first electrode 101 and second electrode 201 form a capacitor. The capacitance value of the capacitor is configured to reconstruct the fuel level shape in the aircraft fuel tank.

[0035] The capacitance is related to the dielectric constant, electrode area, and electrode spacing. With a fixed electrode area and electrode spacing, the capacitance is determined by the dielectric constant. The dielectric constant depends on the fuel-air mixture ratio. Therefore, the liquid level and liquid surface angle can be measured by the capacitance.

[0036] The first electrode 101 and the second electrode 201 cover the entire circumferential surface, and the first electrode 101 and the second electrode 201, which are adjacent and opposite to each other, form a capacitor. The shape of the liquid surface at this location is reconstructed based on the capacitance value of a liquid level measuring device. In this embodiment, the liquid surface shape of a region is reflected by the capacitance values ​​of multiple liquid level measuring devices, thereby improving the measurement accuracy of the liquid volume in this region.

[0037] This application also provides another liquid level measuring device, such as... Figure 2 As shown.

[0038] The liquid level measuring device includes a first electrode group 100, a second electrode group 200, and a shielding layer 300.

[0039] like Figure 3 As shown, the first electrode group 100 includes a plurality of first electrodes 101 evenly spaced along a circumferential direction and a first support layer 102. The first electrodes 101 are disposed on the first support layer 102. The first support layer 102 is cylindrical and provides support for the first electrodes 101. The material of the first support layer 102 is plexiglass. Plexiglass has a stable dielectric constant, and its dielectric constant differs significantly from that of fuel and air, which can reduce the impact on the capacitance value. The first electrodes 101 are attached to the outer surface of the first support layer 102 and are evenly distributed along the circumference of the first support layer 102. The uniform spacing and center alignment of the first electrodes 101 avoid capacitance value deviation caused by misalignment of the first electrodes 101.

[0040] like Figure 4 As shown, the second electrode group 200 is disposed outside the first electrode group 100. The second electrode group 200 includes a plurality of second electrodes 201 evenly distributed along the circumferential direction and a second support layer 202. Each second electrode 201 corresponds one-to-one with a first electrode 101. The second electrodes 201 are disposed on the second support layer 202. The second support layer 202 is cylindrical and coaxial with the first support layer 102, providing support for the second electrodes 201. The material of the second support layer 202 is plexiglass. Plexiglass has a stable dielectric constant, and its dielectric constant differs significantly from that of fuel and air, reducing its impact on capacitance. The second electrodes 201 are attached to the outer surface of the second support layer 202, evenly distributed along the circumference of the second support layer 202. The even spacing and center alignment of the second electrodes 201 prevent capacitance deviation caused by electrode misalignment.

[0041] like Figure 5 As shown, the shielding layer 300 is located outside the second electrode group 200 to prevent the complex electromagnetic environment in the aircraft, such as the engine, avionics system, and radar, from affecting the capacitor.

[0042] The capacitance value of the capacitor is configured to reconstruct the shape of the fuel level in the aircraft fuel tank.

[0043] The liquid level measuring device is inserted into the fuel tank with the circumferential axis perpendicular to it. Fuel is introduced between the inner and outer electrodes at the same height as the fuel surface. By measuring the capacitance, the liquid level height and the liquid surface angle are obtained, and the liquid surface shape is reconstructed. Combined with the fuel tank structure, the fuel volume is calculated by integration.

[0044] Secondly, embodiments of this application also provide a method for measuring the fuel volume in an aircraft fuel tank. This method is based on the liquid level measuring device described in the first aspect, such as... Figure 6 As shown, it includes the following steps: S101. The liquid level height and liquid surface tilt angle are obtained based on the capacitance value of the capacitor.

[0045] like Figure 7 As shown, step S101 includes steps S1011 to S1012.

[0046] S1011. Calculate the liquid level height based on the capacitance value.

[0047] The liquid level is determined based on the mapping relationship between capacitance and liquid level. The area and spacing between the first electrode 101 and the corresponding second electrode 201 remain constant. The capacitance is related to the dielectric constant. The dielectric constant is positively correlated with the ratio of fuel to air between the first electrode 101 and the corresponding second electrode 201, i.e., the capacitance is positively correlated with the liquid level. When the liquid level rises, the proportion of fuel relative to air increases, the dielectric constant increases, and thus the capacitance increases; conversely, when the liquid level falls, the proportion of fuel relative to air decreases, the dielectric constant decreases, and thus the capacitance decreases.

[0048] The relationship between capacitance and liquid level is obtained through pre-calibration. By obtaining capacitance values ​​corresponding to different liquid levels when the liquid surface is horizontal through experiments or simulations, a mapping table or fitting curve is established. This allows the real-time capacitance value to be found within the mapping relationship between capacitance and liquid level to determine the corresponding real-time liquid level.

[0049] S1012. Obtain the liquid surface tilt angle based on the capacitance value of the capacitor pair.

[0050] The liquid surface tilt angle in the direction of the capacitor pair is obtained by mapping the capacitance value of the capacitor pair to the liquid surface tilt angle. For example, for a capacitor pair arranged along the aircraft's heading, the liquid surface tilt angle along the aircraft's heading is detected. For a capacitor pair arranged along the aircraft's transverse heading, the liquid surface tilt angle along the aircraft's transverse heading is detected.

[0051] During flight, the liquid level tilts as the aircraft's attitude changes. The two capacitance values ​​of a capacitor pair change in opposite directions. For example, when the aircraft climbs, the liquid level on the front side rises, and the liquid level on the rear side falls. In a capacitor pair arranged along the flight path, the capacitance of the front capacitor increases, and the capacitance of the rear capacitor decreases. When the aircraft rolls to the left, the liquid level on the left side rises, and the liquid level on the right side falls. In a capacitor pair arranged along the lateral direction, the capacitance of the left capacitor increases, and the capacitance of the right capacitor decreases.

[0052] The mapping relationship between the changes in the two capacitance values ​​of a capacitor pair and the liquid surface tilt angle is based on a pre-defined correspondence between the changes in the two capacitance values ​​and the liquid surface tilt angle. For example, as the changes in the two capacitance values ​​of a capacitor pair increase, the liquid surface tilt angle correspondingly increases. By using this mapping relationship between the relative changes in the two capacitance values ​​of a capacitor pair and the liquid surface tilt angle, the liquid surface tilt angle in the direction of the capacitor pair can be directly obtained.

[0053] S102. Reconstruct the liquid surface shape based on the liquid level height and liquid surface inclination angle.

[0054] A liquid surface shape is reconstructed based on the liquid level height and the liquid surface tilt angle. The liquid level height is used to determine the reference height, the liquid surface tilt angle of the aircraft heading is used to determine the forward and backward tilt slope of the liquid surface, and the liquid surface tilt angle of the aircraft lateral heading is used to determine the left and right tilt slope of the liquid surface. A liquid surface shape is obtained by fitting the reference height, the forward and backward tilt slope of the liquid surface, and the left and right tilt slope of the liquid surface.

[0055] Multiple liquid level measuring devices are evenly distributed in the aircraft's fuel tank. The liquid surface shapes obtained from multiple liquid level measuring devices are pieced together to reconstruct the liquid surface shape of a region.

[0056] By analyzing the fuel level and surface angle, the fuel surface shape within the tank can be reconstructed to match the surface shape under any aircraft attitude, improving the accuracy of subsequent fuel volume calculations. By reconstructing the surface shape of multiple locations into the shape of a single region, it is suitable for large or irregularly shaped fuel tanks.

[0057] S103. Obtain the fuel volume based on the preset fuel tank structure and liquid surface shape.

[0058] The fuel tank structure serves as a benchmark for volume calculations. For example, the shape and size of the fuel tank are entered into the system in advance during aircraft design to calculate the fuel volume.

[0059] A fuel tank is divided into several vertical regions. For each vertical region, the liquid surface shape is extracted based on the fitted overall liquid surface shape. Then, combined with the liquid level height of that vertical region, the fuel volume of that region is calculated. Finally, the total fuel volume in the tank is obtained by summing these regions.

[0060] In one embodiment, simulation is used to measure liquid level height and liquid surface tilt angle.

[0061] like Figure 1 As shown, the liquid level measuring device includes a first electrode group 100, a second electrode group 200, and a shielding layer 300. The first electrode group 100 includes four first electrodes 101 evenly spaced along a circumferential direction and a first support layer 102. The first electrodes 101 are disposed on the first support layer 102. The diameter of the first electrode 101 is 100 mm, its thickness is 2 mm, its arc is 75°, and its height is 300 mm. The thickness of the first support layer 102 is 2 mm. The second electrode group 200 is disposed outside the first electrode group 100. The second electrode group 200 includes four second electrodes 201 evenly spaced along a circumferential direction and a second support layer 202. Each second electrode 201 corresponds to one of the first electrodes 101. The second electrodes 201 are disposed on the second support layer 202. The diameter of the second electrode 201 is 120 mm, its thickness is 2 mm, its arc is 75°, and its height is 300 mm. The thickness of the second support layer 202 is 2 mm. The shielding layer 300 is located on the outside of the second electrode group 200 and has a diameter of 140 mm.

[0062] like Figure 8 As shown, the four first electrodes 101 are labeled N1, N2, N3, and N4 in a counter-clockwise direction. First electrode N1 is located on the right side of the lateral heading, and first electrode N2 is located on the nose side of the heading. The four second electrodes 201 are labeled W1, W2, W3, and W4 according to their correspondence with the first electrodes 101. The first electrodes N1 through N4 are excited sequentially according to their numbers, and the capacitance values ​​are measured simultaneously. For example, when first electrode N1 is excited, the capacitance value between first electrode N1 and second electrode W1 is measured. When first electrode N2 is excited, the capacitance value between first electrode N2 and second electrode W2 is measured. A total of four capacitance values ​​are obtained. Figure 9 This is a simulation diagram illustrating the use of a liquid level measuring device.

[0063] When the tilt angle is 0°, i.e. the liquid surface is horizontal, the capacitance values ​​corresponding to different liquid levels are as follows: Figure 10 As shown, the liquid level and capacitance are linearly related; the capacitance increases with increasing liquid level.

[0064] When an aircraft climbs, descends, or rolls, the fuel tank surface tilts. During a roll, the tilt angle of the fuel tank surface changes with the aircraft's roll angle. Table 1 shows the relationship between the capacitance values ​​at tilt angles of 2°, 4°, and 6° relative to the capacitance value at 0°, with a horizontal fuel level of 16cm. The larger the tilt angle, the greater the capacitance. With capacitor The greater the difference between them, and the opposite the direction of change. For example, when the horizontal liquid level is 16cm, at a tilt angle of 6°, the capacitance... The capacitance is 41.581pF, which is 0.544pF greater than the capacitance at 0° horizontal position. Capacitor The capacitance value is 40.500 pF, which is 0.545 pF less than the capacitance value at 0°.

[0065] Table 1: Capacitance values ​​at different liquid surface inclination angles when the horizontal liquid level is 16cm

[0066] The tilt angle of the liquid surface caused by the change in roll angle can be controlled by a capacitor. and capacitor The capacitance is characterized by the change in capacitance value. and capacitors The capacitance value exhibits a change in magnitude but opposite direction relative to the capacitance value when the liquid level is horizontal. Therefore, utilizing the capacitance... and capacitor It can detect roll angle information. (Regarding capacitors) and capacitor Differential detection can improve the sensitivity of roll angle detection and resist common-mode noise.

[0067] Similarly, the tilt angle of the liquid surface caused by the change in pitch angle can be controlled by a capacitor. and capacitor The capacitance is characterized by the change in capacitance value. and capacitor The capacitance value exhibits a change in magnitude but opposite direction relative to the capacitance value when the liquid level is horizontal. Therefore, utilizing the capacitance... and capacitor It can detect pitch angle information. (Regarding capacitors) and capacitor Differential detection can improve the sensitivity of pitch angle detection and resist common-mode noise.

[0068] After obtaining the liquid level height and liquid level angle, the liquid level shape is fitted, and then the fuel volume is calculated by combining the fuel tank structure.

[0069] Thirdly, embodiments of this application also provide an aircraft, including the liquid level measuring device described in the first aspect. The liquid level measuring device can obtain the liquid level height and liquid surface angle, providing a more comprehensive reflection of the liquid level state in the fuel tank, thereby improving the accuracy of fuel quantity detection and ensuring the safety of aircraft flight.

[0070] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0071] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Although this application has been disclosed above with reference to preferred embodiments, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A liquid level measuring device, characterized in that The liquid level measuring device is used to measure the volume of fuel in an aircraft fuel tank, and the liquid level measuring device includes: The first electrode group (100) includes a plurality of first electrodes (101) spaced apart along a circumferential direction. The second electrode group (200) is disposed outside the first electrode group (100). The second electrode group (200) includes a plurality of second electrodes (201) spaced apart along the circumferential direction. The first electrode (101) is disposed opposite to at least one second electrode (201). In the liquid level measuring device, a capacitor is formed between the first electrode (101) and the second electrode (201) arranged adjacent to each other, and the capacitance value of the capacitor is configured to reconstruct the liquid level shape of the fuel in the aircraft fuel tank.

2. The liquid level measuring device according to claim 1, characterized in that The plurality of first electrodes (101) are uniformly distributed along the circumferential direction; Multiple second electrodes (201) are evenly distributed along the circumferential direction.

3. The liquid level measuring device of claim 1, wherein, The second electrode (201) corresponds one-to-one with the first electrode (101), and the corresponding first electrode (101) and the second electrode (201) constitute the capacitor.

4. The liquid level measuring device of claim 1, wherein, The liquid level measuring device further includes: A shielding layer (300) is located outside the second electrode group (200).

5. The liquid level measuring device of claim 1, wherein, The first electrode group (100) further includes a first carrier layer (102), and the first electrode (101) is disposed on the first carrier layer (102); The second electrode group (200) further includes a second carrier layer (202), which is disposed on the outside of the first electrode group (100), and the second electrode (201) is disposed on the second carrier layer (202).

6. The liquid level measuring device of claim 1, wherein, Two capacitors arranged opposite each other in a radial direction in the circumferential direction constitute a capacitor pair.

7. The liquid level measuring device according to claim 6, characterized in that The capacitor pairs are arranged in at least two different radial directions in the circumferential direction.

8. The liquid level measuring device according to claim 7, characterized in that The capacitor pairs are arranged along the aircraft's heading and along the aircraft's lateral heading.

9. A method of measuring the fuel volume of an aircraft tank, characterized in that, The measurement method is based on the liquid level measuring device as described in any one of claims 1 to 8, and includes the following steps: The liquid level height and liquid surface tilt angle are obtained based on the capacitance value of the capacitor. The liquid surface shape is reconstructed based on the liquid level height and the liquid surface tilt angle; The fuel volume is obtained based on the preset fuel tank structure and the shape of the liquid surface.

10. A method of measuring the fuel volume of an aircraft tank as claimed in claim 9, characterised in that, The step of obtaining the liquid level height and liquid surface tilt angle based on the capacitance value of the capacitor includes: Based on the mapping relationship between the capacitance value of the capacitor and the liquid level height, the liquid level height corresponding to each capacitance value is obtained.

11. The method for measuring the fuel volume of an aircraft fuel tank according to claim 9, characterized in that, The step of obtaining the liquid level height and liquid surface tilt angle based on the capacitance value of the capacitor includes: The liquid surface tilt angle is obtained based on the capacitance value of the capacitor pair.

12. The method for measuring the fuel volume of an aircraft fuel tank according to claim 11, characterized in that, The step of obtaining the liquid surface tilt angle based on the capacitance value of the capacitance pair includes: The liquid surface tilt angle is obtained based on the mapping relationship between the change in capacitance value of the two capacitors in the capacitor pair and the liquid surface tilt angle.

13. The method for measuring the fuel volume of an aircraft fuel tank according to claim 9, characterized in that, The step of reconstructing the liquid surface shape based on the liquid level height and the liquid surface tilt angle includes: The shape of a liquid surface is reconstructed based on the liquid level height and the liquid surface inclination angle; the shape of a region's liquid surface is reconstructed based on multiple liquid surface shapes.

14. An aircraft, characterized in that, Includes the liquid level measuring device as described in any one of claims 1 to 8.

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