CN215415495U

CN215415495U - Acceleration sensing verification device based on gas capacitance electric field effect

Info

Publication number: CN215415495U
Application number: CN202120997591.XU
Authority: CN
Inventors: 王红卫; 胡金博; 朱文龙; 王超; 于滟文; 杨敏博; 张书扬; 程嗣怡; 王洪迅; 孙兆祥
Original assignee: Northwestern Polytechnical University; Air Force Engineering University of PLA
Current assignee: Northwestern Polytechnical University; Air Force Engineering University of PLA
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2022-01-04
Anticipated expiration: 2031-05-11

Abstract

The invention discloses an acceleration sensing verification device based on a gas capacitance electric field effect, which comprises a shell base, a sealing cover, a sealing gasket, an upper air valve nozzle, a lower air valve nozzle, a capacitance measurement substrate and a structural flat capacitor, wherein the shell base is provided with a sealing cover; the shell base is a cuboid, the interior of the shell base is a cuboid cavity, and one side surface of the cuboid cavity is open; the sealing washer is clamped between the open side of the shell base and the sealing cover; the shell base, the sealing washer and the sealing cover are fixed by a plurality of rivets to seal the cuboid cavity, and the cuboid cavity is filled with medium gas; a capacitance measuring substrate is arranged in the shell base, and a plurality of structural flat capacitors are arranged on the capacitance measuring substrate; the upper inflating valve and the lower inflating valve are respectively arranged on the upper side surface and the lower side surface of the shell base and used for replacing gas in the shell base. The device provided by the invention has a compact structure and scientific and reasonable design, can be applied to verification and measurement of air capacitance acceleration characteristics, and can verify the acceleration of a measured measurement platform more accurately and accurately.

Description

Acceleration sensing verification device based on gas capacitance electric field effect

Technical Field

The invention belongs to the technical field of measurement, and particularly relates to an acceleration sensing verification device.

Background

The traditional acceleration sensor is designed according to Hooke's law and Newton's second law, and the accelerometer has shown wide application prospect in various fields. According to Hooke's law, the deformation of a spring is in direct proportion to the force applied to the spring; according to Newton's second law, the acceleration of the object is in direct proportion to the acting force under the condition of certain mass; therefore, a specific structural construction can be carried out, so that a certain quantitative relation exists between the deformation and the acceleration of the spring; i.e. acceleration can be measured by spring deformation, which is the basic working principle of such accelerometers.

Such accelerometers typically consist of a proof mass (also called a proof mass), a support, a potentiometer, a spring, a damper and a housing. The proof mass is constrained to move along only one axis, which is often referred to as the input shaft or the sensitive shaft. According to Newton's law, when the instrument shell moves with the carrier in an accelerating way along the sensitive axis direction, the detection mass body diagram with certain inertia keeps the original motion state unchanged; relative movement is generated between the detection mass body and the shell, so that the spring is deformed, and the detection mass body accelerates under the action of the spring force. When the spring force is balanced with the inertia force generated by the detection mass body during the acceleration movement, the detection mass body and the shell do not move relatively any more, and the deformation of the spring reflects the magnitude of the detected acceleration. The acceleration signal is then converted to an electrical signal by the displacement sensing element for output. However, the accelerometer will oscillate due to the characteristics of the spring, and is essentially a one-degree-of-freedom oscillating system, and a damper is used to improve the dynamic quality of the system.

Most accelerometers currently use the principle and construction described above to measure and calculate the acceleration; and it is obvious that the key parts thereof are the proof mass and the spring. However, the spring has a certain damping, and the elastic coefficient of the spring changes along with the continuous wear of the spring, so that a great measurement error is generated after the accelerometer is used for a period of time, and a great hidden danger is possibly caused to the safety of the used equipment due to inaccurate measurement. In the acceleration measuring device, due to the inherent working principle of the device, the structure formed by the detection mass body, the spring and the damper inevitably has certain reaction time, so that the output of the measured value of the accelerometer is inevitably delayed, and the acceleration cannot be really monitored in real time.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the acceleration sensing verification device which is not based on Hooke's law, further has no solid structures such as a detection mass body and a spring and is based on the gas acceleration characteristic and the capacitance electric field effect. The device constructs a cuboid closed space cavity to seal certain medium gas; a plurality of plate capacitors with the same size are constructed on two sides of the long wall of the cuboid, and gas in the cuboid cavity is used as a medium. Due to the van der Waals force action among the dielectric gas molecules, if no external force action exists, the dielectric gas is uniformly distributed, and the capacitance values of the flat capacitors are the same. When the whole device moves along the long side of the cuboid with acceleration, the medium gas molecules have mass and inevitably generate acting force in the acceleration action process; the density of air molecules in the rectangular parallelepiped enclosed space necessarily changes with the change of the acceleration. When the plate capacitor constructed on the side wall of the rectangular cavity is energized, the polarization characteristics of the dielectric gas are different inevitably, and further the capacitance values are different. Therefore, the distribution of the density of the medium gas can be obtained by measuring the capacitance distribution of the cuboid cavity along the long edge direction, and the measured value of the acceleration is obtained.

The invention comprises a shell base, a sealing cover, a sealing gasket, an upper air valve nozzle, a lower air valve nozzle and a capacitance measuring substrate. There are mainly three functional modules. The first functional module is a shell base, a sealing cover and a sealing gasket and is used for forming a closed cuboid cavity. The second functional module is an upper valve and a lower valve, and the two valves are used for ventilation of gas media in the cavity. The third functional module is two groups of capacitor substrates which are attached to two side walls of the rectangular cavity and used for forming flat capacitors which take cavity gas as a medium and have the same area and the same distance; the capacitor is output to the outside of the sealed cavity through the lead wire and insulated from the whole case. The device provided by the invention has a compact structure and scientific and reasonable design, can be applied to verification and measurement of gas capacitance acceleration characteristics, and can verify the acceleration of a measured measurement platform more accurately and accurately.

The technical scheme adopted by the invention for solving the technical problems is as follows:

an acceleration sensing verification device based on a gas capacitance electric field effect comprises a shell base, a sealing cover, a sealing gasket, an upper air valve nozzle, a lower air valve nozzle, a capacitance measurement substrate, a structural flat capacitor and an outer circuit board; the shell base is a cuboid, a cuboid cavity is formed in the shell base, and one side surface of the cuboid cavity is open; the sealing gasket is clamped between the open side surface of the shell base and the sealing cover and is used for enhancing the air tightness of the acceleration sensing verification device; the shell base, the sealing washer and the sealing cover are fixed by a plurality of rivets, so that the cuboid cavity is sealed; two opposite side surfaces in the shell base are respectively provided with a capacitance measuring substrate, and the two capacitance measuring substrates have the same size; the number of the structural flat capacitors is N, two pole plates of each structural flat capacitor are respectively arranged on two capacitance measuring substrates, and the N structural flat capacitors are uniformly distributed on the capacitance measuring substrates; the middle relative position of the upper side surface and the lower side surface of the shell base is provided with a hole, and the upper inflating valve and the lower inflating valve are respectively arranged on the holes formed in the middle relative position of the upper side surface and the lower side surface of the shell base and used for replacing medium gas in the shell base.

Preferably, four base fixing lugs respectively positioned at four corners of the housing base are arranged on the bottom surface of the exterior of the housing base opposite to the open side surface, and are used for fixing the acceleration sensing and verifying device on the mobile platform.

Preferably, the upper valve and the lower valve contain valve cores, the valve cores can be opened automatically when the cuboid cavity is filled with medium gas, so that the medium gas enters the inner space, and the valve cores can be closed automatically and seal the medium gas after the filling is finished.

Preferably, the medium gas in the cuboid cavity can be replaced, and technical verification of the acceleration sensing verification device is performed on different medium gases.

Preferably, 2N small holes are formed in the shell base and on the bottom surface, and are used for connecting pins of N structural flat capacitors and connecting electric signals; measuring capacitance values at different positions in the device, and further completing 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.

Preferably, N-5.

The invention has the following beneficial effects:

1. the device provided by the invention has no spring and no solid sensitive mass body, and a series of structural structures such as corresponding supports, dampers and the like are cancelled, so that the structure is simpler.

2. The device provided by the invention has the advantages of no spring, no solid sensitive mass, no support, no damper and the like, shorter reaction time and faster acceleration test;

3. the invention is provided with the sealing structure and the two air valves, can fill different gas media into the inner space of the valve, and can realize the measurement and verification of different gases.

4. The invention is provided with the sealing structure and the two inflating valves, and can fill different pressures in specific gas media, so that the measurement and verification under different air pressure conditions can be realized.

5. The device has no structure such as a spring, a mass body, a support and the like, so that the acceleration measuring range can be larger, and the device is not only suitable for a small acceleration moving platform, but also suitable for a large acceleration moving platform.

6. The device is provided with a plurality of groups of capacitors, can describe the distribution condition of internal gas molecules under specific acceleration, and tests and verifies the technical scheme.

Drawings

Fig. 1 is a schematic view of the overall appearance structure of the device of the present invention.

FIG. 2 is a schematic diagram showing the construction of each component structure of the apparatus of the present invention.

Fig. 3 is a view of the various sides of the device of the present invention.

Fig. 4 is a schematic structural view and various side views of a housing base in the device of the present invention.

Fig. 5 is a schematic structural view and various side views of a closure in the device of the present invention.

FIG. 6 is a schematic view of a capacitance measurement substrate constructed in accordance with the apparatus of the present invention using a selected coordinate system for the capacitance measurement substrate.

Fig. 7 is a schematic structural diagram of an embodiment of the present invention.

Wherein: 1-a housing base; 2, an upper valve mouth; 3-lower valve; 4-a capacitance measuring substrate; 5-a capacitance measuring substrate; 6-a sealing gasket; 7, sealing the cover; 8, riveting; 9-a structured plate capacitor; 10-acceleration sensing verification device; 11-a mobile platform; 12-multi-capacitor test platform; 13-test cable.

a-the lower surface of the housing base; b-the upper surface of the housing base; c-the back side of the housing base; d-the front side of the housing base; e-the right side of the housing base; f-left side of the housing base.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

The invention provides an acceleration sensing verification device based on a gas capacitance electric field effect. The device is exquisite and compact, is suitable for various mobile platforms needing acceleration measurement, can be firmly fixed on various mobile platforms, and ensures that the acceleration of each mobile platform can be more accurately verified and measured in real time in the moving process.

An acceleration sensing verification device based on a gas capacitance electric field effect comprises a shell base 1, a sealing cover 7, a sealing gasket 6, an upper air valve mouth 2, a lower air valve mouth 3, a capacitance measurement substrate 4, a structural flat capacitor 9 and an external circuit board; the shell base 1 is a cuboid, a cuboid cavity is formed inside the shell base 1, and one side surface of the cuboid cavity is open; the sealing gasket 6 is clamped between the open side surface of the shell base 1 and the sealing cover 7, and can completely seal a gap possibly existing between the shell base 1 and the sealing cover 7, so that the air tightness of the device is ensured; the shell base 1, the sealing washer 6 and the sealing cover 7 are fixed by a plurality of rivets 8, a cuboid cavity is sealed, and medium gas is filled in the cuboid cavity; the shape and size of the sealing cover 7 are completely the same as the shape and size of the a-surface of the shell base 1, the hole diameter of a rivet reserved on the sealing cover 7 is slightly larger than the diameter of the rivet 8 so as to ensure that the rivet can be matched with the rivet 8, and the position of a rivet hole reserved on the sealing cover 7 is the same as that of the rivet hole reserved on the shell base 1; two opposite side surfaces in the shell base 1 are respectively provided with a capacitance measuring substrate 4, and the two capacitance measuring substrates 4 have the same size; the number of the structural flat capacitors 9 is N, two pole plates of each structural flat capacitor 9 are respectively arranged on the two capacitance measuring substrates 4, and the N structural flat capacitors 9 are uniformly distributed on the capacitance measuring substrates 4; the middle relative position of the upper side surface and the lower side surface of the shell base 1 is provided with a hole, the upper inflating valve 2 and the lower inflating valve 3 are respectively arranged on the holes formed in the middle relative position of the upper side surface and the lower side surface of the shell base 1, and the diameters of the upper inflating valve 2 and the lower inflating valve 3 are the same as the diameter of the reserved mounting hole of the shell base 1 and are used for replacing the medium gas in the shell base 1.

Preferably, four base fixing lugs respectively positioned at four corners of the housing base 1 are arranged on the bottom surface of the exterior of the housing base 1 opposite to the open side surface, and are used for fixing the acceleration sensing and verifying device on the mobile platform.

Preferably, the upper valve 2 and the lower valve 3 contain valve cores inside, the valve cores can be opened automatically when the cuboid cavity is filled with medium gas so that the medium gas enters the inner space, and the valve cores can be closed automatically and seal the medium gas after the filling is finished.

Preferably, 2N small holes are formed in the housing base 1 and on the bottom surface, and are used for connecting pins of N structural flat capacitors 9 for connecting electrical signals; measuring capacitance values at different positions in the device, and further completing 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.

Preferably, two opposite side surfaces inside the housing base 1 are respectively provided with four groove tenons, and the capacitance measuring substrate 4 is clamped between the four groove tenons and is installed on the housing base 1.

Preferably, as shown in fig. 5, there are 20 rivets 8 for fixing the housing base 1, the sealing gasket 6 and the cover 7.

Preferably, N-5.

The specific embodiment is as follows:

as shown in fig. 1 to 6, an acceleration sensing verification device based on a gas capacitance electric field effect includes a housing base 1 and a cover 7 that can be tightly attached to an opening surface of a housing, a sealing gasket 6 for enhancing the air tightness of the device is installed between the housing base 1 and the cover 7, the housing base 1 and the cover 7 are tightly sealed by 20 rivets 8, an upper air valve 2 and a lower air valve 3 for replacing the air filled in the acceleration sensing verification device are respectively installed at the same position on the upper side and the lower side of the housing base 1, a pair of capacitance measurement substrates 4 and 5 are installed inside the housing base 1 on the opposite left and right sides, and five flat capacitors 9 with tightly attached structures are respectively distributed on the surfaces of the capacitance measurement substrates 4 and 5 according to a central line.

In this embodiment, the sealing gasket 6 and the sealing cover 7 mainly cover and encapsulate the upper surface of the base casing base to keep the number of gas molecules in the device constant, so as to ensure the function of the device, and the rivet 8 mainly connects the sealing sheet 7 with the base casing base 1 to ensure the integrity of the connection of the device and the perfect air tightness of the device.

In this embodiment, five flat square plate capacitors 9 are respectively distributed on the capacitance measurement substrate 4 and the capacitance measurement substrate 5 along the central line, and are used for measuring capacitances at different positions in the measurement device, and the measurement data can be led out to an external circuit through pins for real-time processing and calculation, and meanwhile, the data measured at different positions can be combined, calculated and verified to ensure that the obtained acceleration is more precise.

The upper inflating valve 2 and the lower inflating valve 3 internally comprise valve cores, the valve cores can be automatically opened by the inflating valves during inflation so that gas can enter an internal closed space, and the valve cores can be automatically closed and hermetically store the internal gas after inflation is finished so as to be isolated from the outside to ensure the gas tightness of the device. The internal space of the shell base 1 is inflated and replaced by medium gas through the inflating valve, different gas media can be filled according to actual requirements when the device is used, and in addition, the device can be inflated and ventilated regularly in the using process, so that the verification and measurement accuracy of the device can be ensured.

In this embodiment, the inner space of the housing base can be filled with the filled medium gas through the valve and replaced with the gas type, different gas media can be filled according to actual requirements during use, and in addition, the device can be inflated and ventilated regularly during use, so that the verification and measurement accuracy of the device can be ensured.

One use of this embodiment is shown in fig. 7, which contains 4 components. Wherein the component 10 is an abstract representation of the inventive arrangement, which is abstracted to 5 capacitors. The component 11 is a mobile platform; the member 10 is attached to the member 11 in the same manner as the member 11 moves, so that the acceleration of the member 11 can be sensed. The component 12 is a multi-capacitor test platform that can measure the capacitance values of 5 capacitors in the component 10. The component 13 is a connection cable for completing the connection of signals between the component 10 and the component 12.

The acceleration sensing verification device of the present embodiment is verified:

1. the acceleration sensing verification device is filled with test gas through the upper inflating valve 2 and the lower inflating valve 3, different gases have different dielectric constants and different molecular weights, and therefore the performance characteristics are different; any one of the upper inflating valve 2 and the lower inflating valve 3 can be used as an air inlet, and the other one is an air outlet; in the process of inflating the air inlet, the air outlet is opened for a period of time, so that the container discharges interference gas and is filled with corresponding test gas; and then the air valve of the air outlet is stopped, and the accelerometer of the invention is continuously inflated until the accelerometer is inflated to a set value.

2. Fixing the device 10 of the present invention filled with the test gas on the mobile platform 11, and ensuring that 5 capacitors of the device 10 are distributed along the acceleration direction; the test cable 13 is connected well, and the multi-capacitor test platform 12 can work normally.

3. In the absence of acceleration, the capacitance in the device 10 is tested multiple times by the multi-capacitance test platform 12, and the test results are recorded.

4. A specific acceleration value is set through the mobile platform 11 and is guaranteed to be stable, the capacitors in the device 10 are tested for multiple times through the multi-capacitor testing platform 12, and the testing results are recorded.

5. A new acceleration value is set by the mobile platform 11 and is guaranteed to be stable, the capacitors in the device 10 are tested for multiple times by the multi-capacitor testing platform 12, and the test results are recorded.

6. And (5) repeating the step (5) as required, and if the test gas needs to be replaced, repeating the step (1) to the step (5).

7. The above test record data is analyzed to verify the relationship between the acceleration a of the mobile platform and other factors of the device 10 in this embodiment.

Claims

1. An acceleration sensing verification device based on a gas capacitance electric field effect is characterized by comprising a shell base, a sealing cover, a sealing gasket, an upper air valve nozzle, a lower air valve nozzle, a capacitance measurement substrate, a structural flat capacitor and an outer circuit board; the shell base is a cuboid, a cuboid cavity is formed in the shell base, and one side surface of the cuboid cavity is open; the sealing gasket is clamped between the open side surface of the shell base and the sealing cover and is used for enhancing the air tightness of the acceleration sensing verification device; the shell base, the sealing washer and the sealing cover are fixed by a plurality of rivets, so that the cuboid cavity is sealed; two opposite side surfaces in the shell base are respectively provided with a capacitance measuring substrate, and the two capacitance measuring substrates have the same size; the number of the structural flat capacitors is N, two pole plates of each structural flat capacitor are respectively arranged on two capacitance measuring substrates, and the N structural flat capacitors are uniformly distributed on the capacitance measuring substrates; the middle relative position of the upper side surface and the lower side surface of the shell base is provided with a hole, and the upper inflating valve and the lower inflating valve are respectively arranged on the holes formed in the middle relative position of the upper side surface and the lower side surface of the shell base and used for replacing medium gas in the shell base.

2. The acceleration sensing and verification device based on the gas-capacitor electric field effect as claimed in claim 1, wherein there are four base fixing lugs located at four corners of the housing base respectively on the bottom surface of the housing base opposite to the open side for fixing the acceleration sensing and verification device on the mobile platform.

3. The acceleration sensing verification device based on the gas capacitance electric field effect is characterized in that the upper valve nozzle and the lower valve nozzle internally comprise valve cores, the valve cores can be automatically opened when the cuboid cavity is filled with medium gas, so that the medium gas can enter the internal space, and the valve cores can be automatically closed and seal the medium gas after the cuboid cavity is filled with the medium gas.

4. The acceleration sensing and verifying device based on the gas capacitance electric field effect as claimed in claim 1, wherein the medium gas in the rectangular parallelepiped cavity can be replaced, and the technical verification of the acceleration sensing and verifying device is performed for different medium gases.

5. The acceleration sensing and verifying device based on the gas capacitance electric field effect as claimed in claim 1, wherein 2N small holes are opened in the base and the bottom surface of the housing, and pins for N structural flat capacitors are connected out for connecting electric signals; measuring capacitance values at different positions in the device, and further completing 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.

6. The acceleration sensing and verification device based on the gas capacitance electric field effect according to claim 5, wherein N-5.