An acceleration sensing verification device and method based on the gas capacitance electric field effect

Abstract

The present invention discloses an acceleration sensing verification device based on the air capacitance electric field effect, which includes a housing base, a cover, a sealing gasket, an upper air nozzle, a lower air nozzle, a capacitance measurement substrate and a structural parallel-plate capacitor; the housing base is a cuboid with a cuboid cavity inside, and one side of the cuboid cavity is open; the sealing gasket is clamped between the open side of the housing base and the cover; the housing base, the sealing gasket and the cover are fixed with multiple rivets to seal the cuboid cavity, and the cuboid cavity is filled with a dielectric gas; the capacitance measurement substrate is installed inside the housing base, and multiple structural parallel-plate capacitors are installed on the capacitance measurement substrate; the upper air nozzle and the lower air nozzle are respectively installed on the upper and lower sides of the housing base for replacing the gas inside the housing base. The device provided by the present invention has a compact structure and a scientific and reasonable design, can be applied to the verification and measurement of the acceleration characteristics of air capacitance, and can more accurately and real-time verify the acceleration of the measured measurement platform.

Description

Technical Field

[0001] The present invention belongs to the technical field of measurement, and particularly relates to an acceleration sensing verification device and method. Background Art

[0002] Traditional acceleration sensors are mostly designed based on Hooke's law and Newton's second law. Such accelerometers have shown broad application prospects in various fields. According to Hooke's law, the deformation of a spring is proportional to the force applied to it; according to Newton's second law, for an object with a certain mass, its acceleration is proportional to the applied force; therefore, a specific structure can be constructed such that there is a certain quantitative relationship between the spring deformation and acceleration; that is, acceleration can be measured through the spring deformation, which is the basic working principle of such accelerometers.

[0003] Such accelerometers usually consist of a proof mass (also called a sensitive mass), a support, a potentiometer, a spring, a damper, and a housing. The proof mass is restricted by the support to move only along one axis, which is often called the input axis or sensitive axis. According to Newton's law, when the instrument housing accelerates along the sensitive axis direction with the carrier, the proof mass with a certain inertia attempts to maintain its original motion state unchanged; a relative motion will occur between it and the housing, which will then cause the spring to deform. Thus, the proof mass accelerates under the action of the spring force. When the spring force balances the inertial force generated during the acceleration of the proof mass, there is no longer relative motion between the proof mass and the housing. At this moment, the deformation of the spring reflects the magnitude of the measured acceleration. Then, the acceleration signal is converted into an electrical signal through a displacement sensing element for output. However, due to the characteristics of the spring, such accelerometers will generate oscillations. It is essentially a one-degree-of-freedom oscillating system and a damper must be used to improve the dynamic quality of the system.

[0004] Currently, most accelerometers mainly measure and calculate acceleration using the above-mentioned principle and structure; and obviously, its key components are the proof mass and the spring. However, due to the fact that the spring itself has a certain damping and the elastic coefficient of the spring will also change with continuous wear of the spring, such accelerometers will generate significant measurement errors after being used for a period of time, and there may be a great potential safety hazard to the equipment in use due to inaccurate measurement. In such an acceleration measurement device, due to the inherent working principle of the device itself, there must be a certain response time in the structure composed of the proof mass, the spring, and the damper, so it is inevitable that the measurement value output of such accelerometers is delayed and it is impossible to truly monitor the acceleration in real time. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides an acceleration sensing and verification device that does not rely on Hooke's law, and thus has no solid structures such as a detected mass body or a spring, but is based on the gas acceleration characteristics and the capacitance electric field effect. This device constructs a cuboid closed space cavity to enclose a certain medium gas; on both sides of the long wall of the cuboid, multiple flat capacitors of the same scale are constructed, using the gas in the cuboid cavity as the medium. Due to the van der Waals force between the medium gas molecules, the medium gas is evenly distributed without external force, and the capacitance values of these flat capacitors are the same. When the device as a whole moves with acceleration along the long side of the cuboid, the medium gas molecules have mass and will inevitably generate a force during the process of being affected by the acceleration; the air molecule density within the cuboid closed interval will inevitably change with the change of the acceleration. When an electric current is applied to the flat capacitors constructed on the side walls of the cuboid cavity, the polarization characteristics of the medium gas will necessarily be different, and thus the capacitance values will also be different. Therefore, by measuring the capacitance distribution along the long side direction of the cuboid cavity, the distribution of the medium gas density therein can be obtained, and then the measured value of the acceleration can be obtained.

[0006] The present invention includes a housing base, a cover, a sealing gasket, an upper air nozzle, a lower air nozzle, and a capacitance measurement substrate. It mainly has three functional modules. The first functional module is the housing base, the cover, and the sealing gasket, which are used to form a closed cuboid cavity. The second functional module is the upper air nozzle and the lower air nozzle, and the two air nozzles are used for the replacement of the gas medium inside the cavity. The third functional module is two groups of capacitance substrates, which are attached to the two side walls of the rectangular cavity and are used to form flat capacitors with the cavity gas as the medium, having the same area and the same distance; the capacitance is output to the outside of the sealed cavity through leads and is insulated from the entire housing. The device provided by the present invention has a compact structure and a scientific and reasonable design, can be applied to the verification and measurement of the gas capacitance acceleration characteristics, and can more accurately and real-time verify the acceleration of the measured measurement platform.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0008] An acceleration sensing verification device based on the gas capacitance electric field effect, comprising a housing base, a cover, a sealing gasket, an upper valve nozzle, a lower valve nozzle, a capacitance measurement substrate, a structural parallel plate capacitor, and an external circuit board; the housing base is a cuboid, and the interior of the housing base is a cuboid cavity with one side open; the sealing gasket is clamped between the open side of the housing base and the cover for enhancing the airtightness of the acceleration sensing verification device; the housing base, the sealing gasket, and the cover are fixed with multiple rivets to seal the cuboid cavity; on two opposite inner sides of the housing base, a capacitance measurement substrate is respectively installed, and the two capacitance measurement substrates are of the same size; there are N structural parallel plate capacitors, and the two plates of each structural parallel plate capacitor are respectively installed on the two capacitance measurement substrates, and the N structural parallel plate capacitors are evenly distributed on the capacitance measurement substrates; holes are opened at the middle relative positions on the upper and lower sides of the housing base, and the upper valve nozzle and the lower valve nozzle are respectively installed on the holes opened at the middle relative positions on the upper and lower sides of the housing base for replacing the dielectric gas in the housing base.

[0009] Preferably, there are four base fixing ears located at the four corners of the housing base on the bottom surface opposite to the open side of the housing base for fixing the acceleration sensing verification device on a mobile platform.

[0010] Preferably, the upper valve nozzle and the lower valve nozzle contain valve cores inside, which can automatically open the valve cores to enable the dielectric gas to enter the internal space when filling the cuboid cavity with the dielectric gas, and the valve cores can automatically close and seal the dielectric gas after inflation.

[0011] Preferably, the dielectric gas in the cuboid cavity can be replaced for technical verification of the acceleration sensing verification device with different dielectric gases.

[0012] Preferably, 2N small holes are opened in the housing base and on the bottom surface for leading out the pins of the N structural parallel plate capacitors for connecting electrical signals; measuring the capacitance values at different positions inside the device, and then completing the verification measurement of the acceleration of the mobile platform; the 2N pins are respectively welded in the 2N small holes to seal the small holes.

[0013] Preferably, N = 5.

[0014] A method for measuring acceleration of an acceleration sensing verification device based on the gas capacitance electric field effect, comprising the following steps:

[0015] Step 1: For the exposed gas on the earth's surface, assuming the gas is located in a three-dimensional rectangular coordinate system xyz, the number of gas molecules dN in the unit volume element x,y,z is:

[0016]

[0017] Among them, n0 represents the gas molecule density in the unit volume element, m represents the equivalent mass of a single gas molecule, k represents the Boltzmann constant, T is the temperature of the gas, ε k represents the average molecular kinetic energy, and ε p represents the potential energy of a single molecule, and v x , v y , v z respectively represent the velocity components of the gas molecules along the x, y, and z directions;

[0018] Since

[0019]

[0020] Therefore

[0021]

[0022] Then the density n of the gas molecules located in the open space is:

[0023]

[0024] Among them, V1 is the unit volume element; if a is the acceleration when the gas moves along the x direction, x is the distance in the acceleration direction, and m represents the equivalent mass of a single gas molecule, then the molecular potential energy distribution of the gas molecules along the x direction is:

[0025] ε p = max(5)

[0026] Then there is a functional relationship between n and the displacement x in the direction of the acceleration a. Different values of x result in different values of n, and its expression is:

[0027]

[0028] Step 2: Assume that the acceleration sensing verification device continuously accelerates in the x direction with an acceleration a. Define the total number of gas molecules in the cuboid cavity as N, the maximum molecular density of the gas as n′0, take the center of gravity of any capacitor measurement substrate as the origin, the length direction of the capacitor measurement substrate as the x-axis, the width direction of the capacitor measurement substrate as the y-axis, and the direction perpendicular to the capacitor measurement substrate as the z-axis to establish a coordinate system; then for this cuboid cavity, there is:

[0029]

[0030] Obviously, n′0 is not equal to n0, that is, the molecular density n0' of the cuboid cavity is constantly changing at all times; simplifying equation (7), we get:

[0031]

[0032] where \(l\) is the length of the capacitance measurement substrate and \(V\) is the internal volume of the cuboid cavity. Therefore, the maximum molecular number density \(n'_0\) of the gas in the cuboid cavity is

[0033]

[0034] Furthermore, the molecular number density distribution \(n(x)\) in the cuboid cavity is obtained as:

[0035]

[0036] Step 3: Since the dielectric constant in the dielectric gas is positively correlated with the distribution density of the dielectric molecules, that is, at positions with different densities of the dielectric gas, the conductivity of the air is also different;

[0037] Assume the dielectric constant of the dielectric gas:

[0038] \(\varepsilon_0 = bn(x)\) (11)

[0039] where \(b\) is a constant to be measured; then

[0040]

[0041] where \(d\) is the distance between the two plates of the structural parallel-plate capacitor; then

[0042]

[0043] From this, the relationship \(\varepsilon(x)\) between the dielectric constant and the position coordinates at any point in the cuboid cavity is calculated as:

[0044]

[0045] If \(P\) is the polarization intensity of the dielectric gas, \(\chi\) e is the polarizability of the dielectric gas, and \(E\) is the total electric field intensity after the dielectric is polarized; under the action of the polarization charge and the electric field, there is:

[0046] \(P=\varepsilon_0\chi\) e \(E\) (15)

[0047] In the dielectric gas, the relationship between the electric field intensity \(E\), the electric displacement vector \(D\), and the polarizability \(\chi\) e of the dielectric gas is:

[0048] \(D = \varepsilon_0E+P=\varepsilon_0(1 + \chi\) e )\(E\) (16)

[0049] \(\varepsilon=\varepsilon_0(1 + \chi\) e )=\(\varepsilon_0\varepsilon\) r (17)

[0050] \(D=\varepsilon E\) (18)

[0051] According to the electrostatic field equation of the medium, the capacitance C of a parallel metal plate with an area of S and a distance of d is obtained as follows:

[0052]

[0053] The internal width w of this cuboid cavity is fixed, and its capacitance element dC is:

[0054]

[0055] Integrating the specific space dC(x) yields its overall capacitance. For example, the overall capacitance C of a cuboid cavity is:

[0056]

[0057] Step 4: Derive the capacitance values of the 5 structural parallel-plate capacitors in the acceleration sensing verification device:

[0058] Step 4-1: For the part, the expression for the gas molecular density is

[0059]

[0060] The capacitance element of this part is

[0061]

[0062] That is, the part corresponding to the to in the coordinate system, and its overall capacitance expression C1 along the x direction is:

[0063]

[0064] Then there is

[0065]

[0066] Step 4-2: For the part, its expression for the gas molecular density is:

[0067]

[0068] That is, the part corresponding to the to in the coordinate system, and the capacitance element of this part is:

[0069] Its overall capacitance expression C2 along the x direction is:

[0070]

[0071] Then there is:

[0072]

[0073] Step 4-3: For part, its gas molecule density expression is:

[0074]

[0075] That is, the part corresponding to in the coordinate system to The capacitance microelement of this part is:

[0076] Its overall capacitance expression C3 in the x direction is:

[0077]

[0078] Then there is

[0079]

[0080] Step 4-4: For part, its gas molecule density expression is:

[0081]

[0082] That is, the part corresponding to in the coordinate system to The capacitance microelement of this part is:

[0083] Its overall capacitance expression C4 in the x direction is:

[0084]

[0085] Then there is:

[0086]

[0087] Step 4-5: For part, that is, the end part, its gas molecule density expression is:

[0088]

[0089] That is, the part corresponding to in the coordinate system to The capacitance microelement of this part is:

[0090]

[0091] The overall capacitance expression C5 in the x - direction is as follows:

[0092]

[0093] Then there is:

[0094]

[0095] Step 4 - 7: Through the formula:

[0096]

[0097] Calculate the b - value of each structural parallel - plate capacitor;

[0098] Step 4 - 7: Conclusion: The capacitance of the capacitor in the acceleration sensing verification device is only related to the magnitude of the acceleration a, and the rest are all constant coefficients. The capacitance and a form a single - valued function relationship, that is, by measuring the capacitance value at any position, the acceleration a of the acceleration sensing verification device can be obtained in real - time.

[0099] A method for verifying an acceleration sensing verification device based on the gas capacitance electric - field effect, comprising the following steps:

[0100] Step 1: The internal space of the housing base of the acceleration sensing verification device can be filled with and the type of the filled dielectric gas can be replaced through a valve nozzle, and different gas dielectrics can be filled during use; and during the use process, the device can also be regularly inflated and exchanged with gas, so as to ensure the verification measurement accuracy of the device;

[0101] Step 2: Fix the acceleration sensing verification device filled with the test gas on a moving platform, so that the measured capacitance of the acceleration sensing verification device is distributed along the acceleration direction; connect the test cable to make the acceleration sensing verification device work;

[0102] Step 3: When the moving platform has no acceleration, test the capacitors in the acceleration sensing verification device respectively through a multi - capacitance test platform for multiple times, and record the test results;

[0103] Step 4: Set an acceleration value through the moving platform and ensure that the acceleration value is constant, test the capacitors in the acceleration sensing verification device respectively through a multi - capacitance test platform for multiple times, and record the test results;

[0104] Step 5: Set a new acceleration value through the moving platform and ensure that the acceleration value is constant, test the capacitors in the acceleration sensing verification device respectively through a multi - capacitance test platform for multiple times, and record the test results;

[0105] Step 6: Repeat Step 5 until the set number of repetitions is reached;

[0106] Step 7: If the medium gas is replaced, repeat Steps 1 to 6.

[0107] Step 8: Analyze the above test results to verify the relationship between the acceleration of the mobile platform and the parameters of the acceleration sensing verification device.

[0108] The beneficial effects of the present invention are as follows:

[0109] 1. The device provided by the present invention has no springs and no solid sensitive mass bodies, eliminating a series of structural components such as corresponding supports and dampers, and the structure is simpler.

[0110] 2. The device provided by the present invention has no springs, no solid sensitive mass, no supports, no dampers, etc., with a shorter response time and faster acceleration measurement.

[0111] 3. The present invention is provided with a sealing structure and two valve nozzles, and different gas media can be filled into its internal space, enabling measurement verification in different gases.

[0112] 4. The present invention is provided with a sealing structure and two valve nozzles, and different pressures can be filled into a specific gas medium, enabling measurement verification under different air pressure conditions.

[0113] 5. This device has no structures such as springs, mass bodies, and supports, so the acceleration measurement range can be larger, and it is applicable not only to mobile platforms with small accelerations but also to mobile platforms with large accelerations.

[0114] 6. This device is provided with multiple groups of capacitors, which can describe the distribution of internal gas molecules under specific accelerations to test and verify the above technical solutions. Description of the Drawings

[0115] Figure 1 is a schematic diagram of the overall external structure of the device of the present invention.

[0116] Figure 2 is a schematic diagram of the structure of each component of the device of the present invention.

[0117] Figure 3 is a view of each side of the device of the present invention.

[0118] Figure 4 is a schematic diagram of the structure of the housing base of the device of the present invention and views of each side.

[0119] Figure 5 is a schematic diagram of the structure of the cover of the device of the present invention and views of each side.

[0120] Figure 6 is a simplified diagram of the capacitance measurement substrate for establishing a coordinate system for the selection of the capacitance measurement substrate in the device of the present invention.

[0121] Figure 7 It is a schematic structural diagram of an embodiment of the present invention.

[0122] Among them: 1 - housing base; 2 - upper valve nozzle; 3 - lower valve nozzle; 4 - capacitance measurement substrate; 5 - capacitance measurement substrate; 6 - sealing washer; 7 - cover; 8 - rivet; 9 - structural planar capacitor; 10 - schematic of acceleration sensing verification device; 11 - moving platform; 12 - multi-capacitance test platform; 13 - test cable.

[0123] a - lower surface of the housing base; b - upper surface of the housing base; c - rear side surface of the housing base; d - front side surface of the housing base; e - right side surface of the housing base; f - left side surface of the housing base. Specific implementation manner

[0124] The present invention will be further described below in conjunction with the drawings and embodiments.

[0125] The present invention provides an acceleration sensing verification device based on the gas capacitance electric field effect. The device is delicate and compact, suitable for various moving platforms that need to measure acceleration, and can be firmly fixed on various moving platforms to ensure that each moving platform can more accurately and real-time verify and measure its acceleration during the moving process.

[0126] An acceleration sensing verification device based on the gas capacitance electric field effect, comprising a housing base 1, a cover 7, a sealing gasket 6, an upper valve nozzle 2, a lower valve nozzle 3, a capacitance measurement substrate 4, a structural parallel-plate capacitor 9 and an external circuit board; the housing base 1 is a cuboid, and the interior of the housing base 1 is a cuboid cavity with one side open; the sealing gasket 6 is sandwiched between the open side of the housing base 1 and the cover 7, and can completely seal the possible gaps between the housing base 1 and the cover 7, thereby ensuring the airtightness of the device; the housing base 1, the sealing gasket 6 and the cover 7 are fixed with multiple rivets 8 to seal the cuboid cavity, and the cuboid cavity is filled with a dielectric gas; the shape and size of the cover 7 are exactly the same as the shape and size of the a surface of the housing base 1, and the rivet holes left on the cover 7 are slightly larger than the diameter of the rivets 8 to ensure that they can fit with the rivets 8, and the positions of the rivet holes left on the cover 7 are the same as the positions of the rivet holes left on the housing base 1; two capacitance measurement substrates 4 are respectively installed on two opposite inner side surfaces of the housing base 1, and the two capacitance measurement substrates 4 are of the same size; there are N structural parallel-plate capacitors 9, and the two electrodes of each structural parallel-plate capacitor 9 are respectively installed on the two capacitance measurement substrates 4, and the N structural parallel-plate capacitors 9 are evenly distributed on the capacitance measurement substrates 4; holes are opened at the middle relative positions of the upper and lower side surfaces of the housing base 1, and the upper valve nozzle 2 and the lower valve nozzle 3 are respectively installed on the holes opened at the middle relative positions of the upper and lower side surfaces of the housing base 1. The diameters of the upper valve nozzle 2 and the lower valve nozzle 3 are the same as the diameters of the reserved installation holes of the housing base 1, and are used to replace the dielectric gas in the housing base 1.

[0127] Preferably, there are four base fixing ears located at the four corners of the housing base 1 on the bottom surface of the housing base 1 opposite to the open side, and are used to fix the acceleration sensing verification device on the mobile platform.

[0128] Preferably, the upper valve nozzle 2 and the lower valve nozzle 3 contain valve cores inside. When filling the cuboid cavity with the dielectric gas, the valve cores can be automatically opened to enable the dielectric gas to enter the internal space, and the valve cores can be automatically closed and sealed after the inflation is completed.

[0129] Preferably, the dielectric gas in the cuboid cavity can be replaced to conduct technical verification of the acceleration sensing verification device for different dielectric gases.

[0130] Preferably, 2N small holes are opened on the bottom surface inside the housing base 1 for the leads of the N structural parallel-plate capacitors 9 to be led out for connecting electrical signals; the capacitance values at different positions inside the device are measured, and then the verification measurement of the acceleration of the mobile platform is completed; the 2N leads are respectively welded in the 2N small holes to seal the small holes.

[0131] Preferably, there are four groove tenons on each of the two opposite inner sides of the housing base 1, and the capacitance measurement substrate 4 is clamped in the middle of the four groove tenons and installed on the housing base 1.

[0132] Preferably, as Figure 5 shown, there are 20 rivets 8 for the fixed housing base 1, the sealing gasket 6 and the cover 7.

[0133] Preferably, N = 5.

[0134] A method for verifying an acceleration sensing verification device based on the gas capacitance electric field effect includes the following steps:

[0135] Step 1: The internal space of the housing base of the acceleration sensing verification device can be filled with the filled dielectric gas and the gas type can be replaced through a valve nozzle, and different gas dielectrics can be filled during use; and during the use process, the device can also be regularly inflated and replaced with gas, so as to ensure the verification measurement accuracy of the device;

[0136] Step 2: Fix the acceleration sensing verification device filled with the test gas on a moving platform, so that the measured capacitors of the acceleration sensing verification device are distributed along the acceleration direction; connect the test cable to make the acceleration sensing verification device work;

[0137] Step 3: When the moving platform has no acceleration, the capacitors in the acceleration sensing verification device are respectively tested multiple times through a multi-capacitance test platform, and the test results are recorded;

[0138] Step 4: Set an acceleration value through the moving platform and ensure that the acceleration value is constant, and the capacitors in the acceleration sensing verification device are respectively tested multiple times through a multi-capacitance test platform, and the test results are recorded;

[0139] Step 5: Set a new acceleration value through the moving platform and ensure that the acceleration value is constant, and the capacitors in the acceleration sensing verification device are respectively tested multiple times through a multi-capacitance test platform, and the test results are recorded;

[0140] Step 6: Repeat Step 5 until the set number of repetitions is reached;

[0141] Step 7: If the dielectric gas is replaced, repeat Steps 1 to 6;

[0142] Step 8: Analyze the above test results to verify the relationship between the acceleration of the moving platform and the parameters of the acceleration sensing verification device. Specific embodiments:

[0144] As Figures 1 to 6As shown in the figure, an acceleration sensing verification device based on the gas capacitance electric field effect includes a housing base 1 and a cover 7 that can be closely attached to the opening surface of the housing. A sealing gasket 6 for enhancing the airtightness of the device is installed between the housing base 1 and the cover 7. The housing base 1 and the cover 7 are sealed tightly by 20 rivets 8. An upper air valve 2 and a lower air valve 3 for replacing the gas filled inside the acceleration sensing verification device are installed at the same positions on the upper and lower sides of the housing base 1 respectively. Inside the housing base 1, a pair of capacitance measurement substrates 4 and capacitance measurement substrates 5 are installed opposite to each other on the left and right. Five tightly attached structural flat capacitors 9 are distributed along the center line on the surfaces of the capacitance measurement substrate 4 and the capacitance measurement substrate 5 respectively.

[0145] In this embodiment, the sealing gasket 6 and the cover 7 mainly play a role of covering and encapsulating on the upper surface of the base shell to keep the number of gas molecules inside the device constant, providing guarantee for the realization of the device function. The rivets 8 mainly connect the cover 7 to the base shell 1 to ensure the integrity of the device connection and the good airtightness of the device.

[0146] In this embodiment, five tightly attached flat cube-shaped structural flat capacitors 9 are distributed along the center line on each of the capacitance measurement substrate 4 and the capacitance measurement substrate 5, which are used to measure the capacitance at different positions inside the device. The measurement data can be led out to an external circuit through pins for real-time processing and calculation. At the same time, the data measured at different positions can be combined and calculated for verification to ensure that the obtained acceleration is more precise.

[0147] The upper air valve 2 and the lower air valve 3 contain valve cores inside. When inflating, the air valve can automatically open the valve core to allow gas to enter the internal closed space. After inflation, the valve core can automatically close and seal the internal gas to isolate it from the outside world to ensure the airtightness of the device. The internal space of the housing base 1 is filled with and replaced with medium gas through the air valve. Different gas media can be filled according to actual needs during use. In addition, the device can be regularly inflated and replaced with gas during use, so as to ensure the verification and measurement accuracy of the device.

[0148] In this embodiment, the internal space of the housing base can be filled with and the type of the filled medium gas can be replaced through the air valve. Different gas media can be filled according to actual needs during use. In addition, the device can be regularly inflated and replaced with gas during use, so as to ensure the verification and measurement accuracy of the device.

[0149] A usage of this embodiment Figure 7As shown, it contains 4 components. Among them, component 10 is an abstract schematic of the device of the present invention, which is abstracted into 5 capacitors. Component 11 is a moving platform; component 10 is fixedly connected to component 11 and has the same motion mode as component 11, so it can sense the acceleration of component 11. Component 12 is a multi-capacitance test platform that can measure the capacitance values of the 5 capacitors in component 10 respectively. Component 13 is a connecting cable used to complete the connection of signals between component 10 and component 12.

[0150] The verification method for the acceleration sensing verification device of this embodiment is as follows:

[0151] 1. Fill the acceleration sensing verification device of the present invention with test gas through the upper valve nozzle 2 and the lower valve nozzle 3. Different gases have different dielectric constants and molecular weights, so their performance characteristics are also different; either the upper valve nozzle 2 or the lower valve nozzle 3 can be used as the air inlet, and the other is the air outlet; during the inflation process at the air inlet, the air outlet is opened for a period of time first to discharge the interfering gas in the container and fill it with the corresponding test gas; then stop the valve of the air outlet and continue to inflate the accelerometer of the present invention until the set value is reached.

[0152] 2. Fix the device 10 of the present invention filled with test gas on the above-mentioned moving platform 11, and ensure that the 5 capacitors of the device 10 are distributed along the acceleration direction; connect the test cable 13 well and ensure that the multi-capacitance test platform 12 can work normally.

[0153] 3. In the case of no acceleration, use the multi-capacitance test platform 12 to test the capacitors in the device 10 multiple times respectively and record the test results.

[0154] 4. Set a specific acceleration value through the moving platform 11 and ensure that the acceleration value is stable. Use the multi-capacitance test platform 12 to test the capacitors in the device 10 multiple times respectively and record the test results.

[0155] 5. Set a new acceleration value through the moving platform 11 and ensure that the acceleration value is stable. Use the multi-capacitance test platform 12 to test the capacitors in the device 10 multiple times respectively and record the test results.

[0156] 6. Repeat step 5 as needed. If it is necessary to replace the test gas, repeat steps 1 to 5.

[0157] 7. Analyze the above test record data to verify the relationship between the acceleration a of the moving platform in this embodiment and other factors of the device 10.

Claims

1. An acceleration sensing verification device based on the gas capacitance electric field effect, comprising a housing base, a cover, a sealing gasket, an upper valve nozzle, a lower valve nozzle, a capacitance measurement substrate, a structural parallel-plate capacitor, and an external circuit board; the housing base is a cuboid, and the interior of the housing base is a cuboid cavity with one side open; the sealing gasket is clamped between the open side of the housing base and the cover to enhance the airtightness of the acceleration sensing verification device; the housing base, the sealing gasket, and the cover are fixed with multiple rivets to seal the cuboid cavity; on two opposite inner sides of the housing base, a capacitance measurement substrate is respectively installed, and the two capacitance measurement substrates are of the same size; there are N structural parallel-plate capacitors, and the two plates of each structural parallel-plate capacitor are respectively installed on the two capacitance measurement substrates, and the N structural parallel-plate capacitors are evenly distributed on the capacitance measurement substrates; holes are opened at the middle relative positions on the upper and lower sides of the housing base, and the upper valve nozzle and the lower valve nozzle are respectively installed on the holes opened at the middle relative positions on the upper and lower sides of the housing base for replacing the dielectric gas in the housing base; On the bottom surface of the housing base opposite to the open side, there are four base fixing ears located at the four corners of the housing base respectively, for fixing the acceleration sensing verification device on a mobile platform; the upper valve nozzle and the lower valve nozzle contain valve cores, which can automatically open the valve cores to allow the dielectric gas to enter the internal space when filling the cuboid cavity with the dielectric gas, and the valve cores can automatically close and seal the dielectric gas after inflation.

2. The acceleration sensing verification device based on the gas capacitance electric field effect according to claim 1, characterized in that The dielectric gas in the cuboid cavity can be replaced to conduct technical verification of the acceleration sensing verification device for different dielectric gases.

3. The acceleration sensing verification device based on the gas capacitance electric field effect according to claim 1, characterized in that 2N small holes are opened in the housing base and on the bottom surface for leading out the pins of the N structural parallel-plate capacitors for connecting electrical signals; measuring the capacitance values at different positions inside the device, and then completing the verification measurement of the acceleration of the mobile platform; the 2N pins are respectively welded in the 2N small holes to seal the small holes.

4. The acceleration sensing verification device based on the gas capacitance electric field effect according to claim 3, wherein, The N = 5.

5. A method for measuring acceleration by an acceleration sensing verification device based on the gas capacitance electric field effect according to claim 1, characterized in that Including the following steps: Step 1: For the exposed gas located on the Earth's surface, assuming the gas is in a three-dimensional rectangular coordinate system xyz, the number of gas molecules dN in a unit volume element is x,y,z as follows: Among them, \(n_0\) represents the gas molecule density in the unit volume element, \(m\) represents the equivalent mass of a single gas molecule, \(k\) represents the Boltzmann constant, \(T\) is the temperature of the gas, \(\varepsilon\) k represents the average molecular kinetic energy, \(\varepsilon\) p represents the potential energy of a single molecule, \(v\) x and \(v\) y and \(v\) z respectively represent the velocity components of the gas molecules along the \(x\), \(y\), and \(z\) directions; Since So If P is the polarization intensity of the dielectric gas, χ e is the polarizability of the dielectric gas, and E is the total electric field intensity after the dielectric is polarized; under the action of the polarization charge and the electric field, there is: P = ε0X e E (15) In a dielectric gas, the relationship between the electric field strength E, the electric displacement vector D, and the polarizability χ of the dielectric gas e is as follows: D = ε0E + P = ε0(1 + x e )E (16) ε = ε0(1 + x e ) = ε0ε r (17) D = εE (18) According to the dielectric electrostatic field equation, the capacitance C of a parallel metal plate with an area of S and a distance of d is: The internal width w of this cuboid cavity is fixed, and its capacitance element dC is: Integrating the specific space dC(x), the overall capacitance can be obtained. For example, the overall capacitance C of the cuboid cavity is: Step 4: Deduce the capacitance values of the 5 structural parallel-plate capacitors in the acceleration sensing verification device: Step 4-1: For the previous part, the gas molecule density expression is The capacitance element of this part is That is, the part corresponding to the coordinate system to The overall capacitance expression C1 in the x direction is as follows: Then there is: Step 4-2: For part, its gas molecular density expression is: That is, the part corresponding to the coordinate system to The capacitance microelement of this part is as follows: Its overall capacitance expression C2 in the x direction is: Then there is: Step 4-3: For part, its gas molecule density expression is: That is, the part corresponding to the coordinate system to The capacitance microelement of this part is as follows: Its overall capacitance expression C3 in the x direction is: Then there is Step 4-4: For part, the expression of its gas molecular density is: i.e., the part corresponding to the coordinate system to The capacitance microelement of this part is as follows: Its overall capacitance expression C4 in the x direction is: Then there is: Step 4-5: For part, i.e., the end part, its gas molecular density expression is: That is, the part corresponding to the coordinate system to The capacitance microelement of this part is as follows: Its overall capacitance expression C5 in the x direction is: Then there is: Step 4 - 7: Through the formula: Calculate the b value of each structural parallel-plate capacitor; Steps 4-7: Conclusion: The capacitance of the capacitor in the acceleration sensing verification device is only related to the magnitude of the acceleration a, and the rest are all constant coefficients. The capacitance and a form a single-valued function relationship, that is, by measuring the capacitance value at any position, the acceleration a of the acceleration sensing verification device can be obtained in real time.

6. A method for verifying the acceleration sensing verification device based on the gas capacitance electric field effect described in claim 1, comprising the following steps: Step 1: The internal space of the housing base of the acceleration sensing verification device can be filled with and the type of the filled dielectric gas can be replaced through a valve nozzle, and different gas dielectrics can be filled during use; and the device can also be regularly inflated and replaced during use, so as to ensure the verification measurement accuracy of the device; Step 2: Fix the acceleration sensing verification device filled with the test gas on a moving platform, so that the measured capacitance of the acceleration sensing verification device is distributed along the acceleration direction; connect the test cable to make the acceleration sensing verification device work; Step 3: When the moving platform has no acceleration, the capacitors in the acceleration sensing verification device are respectively tested multiple times through a multi-capacitance test platform, and the test results are recorded; Step 4: Set an acceleration value through the moving platform and ensure that the acceleration value is constant, and the capacitors in the acceleration sensing verification device are respectively tested multiple times through a multi-capacitance test platform, and the test results are recorded; Step 5: Set a new acceleration value through the moving platform and ensure that the acceleration value is constant, and the capacitors in the acceleration sensing verification device are respectively tested multiple times through a multi-capacitance test platform, and the test results are recorded; Step 6: Repeat Step 5 until the set number of repetitions is reached; Step 7: If the dielectric gas is replaced, repeat Steps 1 to 6; Step 8: Analyze the above test results to verify the relationship between the acceleration of the moving platform and the parameters of the acceleration sensing verification device.

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