CN112683956B - Gas humidity detection system based on potential difference - Google Patents
Gas humidity detection system based on potential difference Download PDFInfo
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- CN112683956B CN112683956B CN202110040630.1A CN202110040630A CN112683956B CN 112683956 B CN112683956 B CN 112683956B CN 202110040630 A CN202110040630 A CN 202110040630A CN 112683956 B CN112683956 B CN 112683956B
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Abstract
The application relates to a detection system of gas humidity based on potential difference, in particular to the field of humidity measurement. The application provides a detection device based on gaseous humidity of potential difference, when needs detect the gaseous humidity of awaiting measuring, gas to be measured inputs in this pipe through the inlet portion of this pipe one end, this gas to be measured effect and this moisture absorption material layer, this moisture absorption material layer absorbs the moisture in the gas to be measured, make this moisture absorption material layer volume change, and then change the pressure in this pipe, under the effect of pressure, this flexible material layer takes place to deform, act on this piezoelectric material layer, this piezoelectric material layer gathers respectively at the both ends on this piezoelectric material layer at the different sign electric charges under the effect of pressure, just can detect the potential difference that this piezoelectric material produced under the effect of pressure through this first electrode and second electrode, and according to the corresponding relation of potential difference and the gaseous humidity of awaiting measuring, obtain the gaseous humidity of awaiting measuring.
Description
Technical Field
The application relates to the field of humidity measurement, in particular to a detection system for gas humidity based on potential difference.
Background
Humidity, a physical quantity representing the degree of dryness of the atmosphere. The less water vapor contained in a certain volume of air at a certain temperature, the drier the air; the more water vapor, the more humid the air. The degree of dryness of air is called "humidity". In this sense, the physical quantities such as absolute humidity, relative humidity, comparative humidity, mixture ratio, saturation difference, and dew point are commonly used; if it is expressed as a weight percentage of the water vapor in the wet steam to the total weight (volume) of the steam, it is referred to as the humidity of the steam. The humidity at which the human body feels comfortable is: the relative humidity is lower than 70%.
The prior art method for detecting humidity includes: wet and dry bulb measuring method, measuring method of dew point humidity, measuring method of change of geometric dimension of substance, coulometer, optical hygrometer, meteorological chromatography, chemical substance electrical characteristic method, and ionic crystal condensation hygrometer.
However, the above-mentioned method and apparatus for detecting humidity have large size of the used devices, complex structure of the devices, and high manufacturing and maintenance costs, and have large errors, so that the sensitivity of humidity measurement is not sufficient.
Disclosure of Invention
The present invention is directed to provide a detection system for detecting humidity based on potential difference, so as to solve the problems of the prior art, such as large size of the used devices, complex device structure, high manufacturing and maintenance costs, and large errors, resulting in insufficient sensitivity of humidity measurement.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, the application provides a detection device of gas humidity based on potential difference, detection device includes the pipe, the pipe both ends set up respectively to admit air portion and admit air portion, pipe middle part position sets up bellied recess to the position of keeping away from the pipe axle center, the space of recess and the space of pipe constitute "T" word space, the one end that the pipe axle center was kept away from to the recess is provided with flexible material layer and piezoelectric material layer respectively, wherein, the flexible material layer is close to the pipe axle center, the pipe axle center is kept away from to the piezoelectric material layer, piezoelectric material layer both ends are provided with first electrode and second electrode respectively, one side that the piezoelectric material layer was kept away from to the flexible material layer in the recess is provided with the moisture absorption material layer.
Optionally, one surface of the absorbent material layer close to the axis of the catheter is a rough plane.
Optionally, the inner walls of the two sides of the groove and the inner wall of the conduit are provided with a layer of hygroscopic material.
Optionally, the elastic coefficient of the flexible material layer near the inner walls of the two sides of the groove is greater than the elastic coefficient of the flexible material layer far from the inner walls of the two sides of the groove.
Optionally, one side of the piezoelectric material layer close to the axial center of the catheter is provided with a convex structure, and the flexible material layer covers the convex structure of the piezoelectric material layer.
Optionally, the material of the side of the conduit remote from the space of the groove is provided as a light-transmitting material.
Optionally, the material of the flexible material layer is a non-thermal expansion and contraction material.
Optionally, the material of the piezoelectric material layer is a non-thermal expansion and contraction material.
In a second aspect, the present application relates to a detection system of gas humidity based on a potential difference, comprising: the device comprises an electric potential measuring device, a computer and the detection device of gas humidity based on electric potential difference, wherein the positive electrode and the negative electrode of the electric potential measuring device are respectively and electrically connected with the first electrode and the second electrode and used for detecting the output electric potential difference of the detection device, and the computer is in communication connection with the electric potential measuring device and used for receiving the electric potential difference detected by the electric potential measuring device and obtaining the humidity of the gas to be detected according to the corresponding relation between the electric potential difference and the humidity of the gas to be detected.
The invention has the beneficial effects that:
the detection device of gas humidity based on potential difference comprises a guide pipe, wherein two ends of the guide pipe are respectively provided with an air inlet part and an air inlet part, a protruding groove is formed in the middle of the guide pipe towards a position far away from the axis of the guide pipe, the space of the groove and the space of the guide pipe form a T-shaped space, one end, far away from the axis of the guide pipe, of the groove is respectively provided with a flexible material layer and a piezoelectric material layer, the flexible material layer is close to the axis of the guide pipe, the piezoelectric material layer is far away from the axis of the guide pipe, two ends of the piezoelectric material layer are respectively provided with a first electrode and a second electrode, and one side, far away from the piezoelectric material layer, of the flexible material layer in the groove is provided with a moisture absorption material layer; when the humidity of the gas to be detected needs to be detected, the gas to be detected is input into the guide pipe through the gas inlet part at one end of the guide pipe, the gas to be detected acts on the moisture absorption material layer, the moisture absorption material layer absorbs moisture in the gas to be detected, the volume of the moisture absorption material layer is changed, the pressure in the guide pipe is further changed, under the action of the pressure, the flexible material layer deforms and acts on the piezoelectric material layer, different charges of the piezoelectric material layer are respectively gathered at two ends of the piezoelectric material layer under the action of the pressure, the potential difference generated by the piezoelectric material under the action of the pressure can be detected through the first electrode and the second electrode, and the humidity of the gas to be detected is obtained according to the corresponding relation between the potential difference and the humidity of the gas to be detected.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a detection apparatus for detecting humidity of gas based on potential difference according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another apparatus for detecting humidity of gas based on potential difference according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another detection apparatus for gas humidity based on potential difference according to an embodiment of the present invention.
An icon: 10-a catheter; 11-an air intake; 12-an air outlet part; 20-a groove; 21-a layer of hygroscopic material; 22-a layer of flexible material; 23-a layer of piezoelectric material; 24-a first electrode; 25-second electrode.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are one embodiment of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
In order to make the implementation of the present invention clearer, the following detailed description is made with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a detection apparatus for detecting humidity of gas based on potential difference according to an embodiment of the present invention; as shown in fig. 1, the present application provides a detection apparatus for gas humidity based on potential difference, the detection apparatus includes a conduit 10, two ends of the conduit 10 are respectively provided with an air inlet 11 and an air inlet 11, a protruding groove 20 is provided at a middle position of the conduit 10 to a position far away from an axis of the conduit 10, a space of the groove 20 and a space of the conduit 10 form a "T" shaped space, one end of the groove 20 far away from the axis of the conduit 10 is respectively provided with a flexible material layer 22 and a piezoelectric material layer 23, wherein the flexible material layer 22 is close to the axis of the conduit 10, the piezoelectric material layer 23 is far away from the axis of the conduit 10, two ends of the piezoelectric material layer 23 are respectively provided with a first electrode 24 and a second electrode 25, and one side of the flexible material layer 22 far away from the piezoelectric material layer 23 in the groove 20 is provided with a moisture absorption material layer 21.
The shape of the conduit 10 may be a rectangular parallelepiped, or a cylinder, which is not specifically limited herein, for convenience of description, the shape of the conduit 10 is described herein as a cylinder, two ends of the cylinder conduit 10 are respectively set as an air inlet portion 11 and an air outlet portion 12, the air inlet portion 11 and the air outlet portion 12 are oppositely disposed, one end is the air inlet portion 11, and the other end is the air outlet portion 12, the air inlet portion 11 and the air outlet portion 12 are opened when air inflation or air deflation is required, the air inlet portion 11 and the air outlet portion 12 are closed when air deflation or air inflation is finished, so as to keep the gas in the conduit 10 from leaking, and further make the pressure change in the conduit 10 only related to the volume change of the gas to be measured, the air inlet portion 11 and the air outlet portion 12 may be two check valves, or may be other structures for controlling the gas to enter and exit, which is not specifically limited herein, the middle wall position of the conduit 10 is set as a groove 20, the protruding direction of the groove 20 is a direction away from the axis of the conduit 10, i.e. the space in the conduit 10 becomes a "T" space, and a moisture absorption material layer 21, a flexible material layer 22 and a piezoelectric material layer 23 are arranged in the direction away from the axis of the conduit 20, wherein the moisture absorption material layer 21 is closer to the axis of the conduit 10, the flexible material layer 22 is farther from the axis of the conduit 10, the piezoelectric material layer 23 is farthest from the axis of the conduit 10, a first electrode 24 and a second electrode 25 are respectively arranged at two ends of the piezoelectric material layer 23, the piezoelectric material layer 23 is made of a piezoelectric material, the piezoelectric material layer 23 generates a current under a left pressure, the potential of the generated current is proportional to the pressure received by the piezoelectric material layer 23, the volume of the moisture absorption material layer 21 changes according to the humidity in the gas to be measured, the absorption of water vapor in the gas to be measured is larger, the larger the volume change of the moisture absorption material layer 21 is, it should be noted that the humidity of the gas to be measured is measured by measuring the amount of water vapor contained in the gas to be measured, and the gas to be measured contains only one impurity gas, that is, water vapor, and the premise of measuring the humidity of the gas to be measured is that the type of the gas to be measured is known, and because the expansion coefficients of different gases are different, the type of the gas to be measured is known, so that the measurement result of measuring the humidity of the gas to be measured is more accurate; when the humidity of the gas to be detected needs to be detected, the gas to be detected is input into the conduit 10 through the air inlet 11 at one end of the conduit 10, the gas to be detected acts on the moisture absorption material layer 21, the moisture absorption material layer 21 absorbs moisture in the gas to be detected, so that the volume of the moisture absorption material layer 21 changes, the pressure in the conduit 10 is further changed, the flexible material layer 22 deforms under the action of the pressure, the flexible material layer acts on the piezoelectric material layer 23, different charges of the piezoelectric material layer 23 are respectively gathered at two ends of the piezoelectric material layer 23 under the action of the pressure, the potential difference generated under the action of the pressure by the piezoelectric material can be detected through the first electrode 24 and the second electrode 25, the humidity of the gas to be detected is obtained according to the corresponding relationship between the potential difference and the humidity of the gas to be detected, it needs to be noted that the corresponding relationship between the potential difference and the humidity of the gas to be detected is obtained according to experimental measurement, and is not particularly limited herein.
Further, if the humidity of the gas to be measured in the conduit 10 needs to be measured more accurately, a second humidity measurement method is adopted, and the second humidity measurement method is as follows: irradiating the gas to be detected in the guide pipe 10 by using infrared light through the pipe wall of the guide pipe 10, after the gas to be detected absorbs red light matched with the characteristic frequency of the gas molecule to be detected under the irradiation of the infrared light, realizing the energy level transition of electrons in the gas molecule to be detected, transitioning from a ground state to an excited state, stopping the irradiation of the red light, returning the molecule of the gas to be detected to the ground state or other energy levels from the excited state in a non-radiation manner, in the process, releasing energy in the form of heat, expanding water vapor in the gas to be detected and the gas to be detected by the heat, generating deformation under the action of gas pressure by the flexible material layer 22 and acting on the piezoelectric material layer 23, generating potential difference under the action of pressure by the piezoelectric material layer 23, and obtaining the humidity of the gas to be detected according to the corresponding relation between the potential difference and the humidity of the gas to be detected, it should be noted that, the corresponding relationship between the potential difference and the humidity of the gas to be measured is obtained by experimental measurement, and is not specifically limited herein, generally, if the humidity condition of the gas to be measured needs to be measured with higher precision, the two methods for measuring the humidity of the gas need to be combined, and a total potential difference is obtained by measurement, then the error of humidity measurement caused by the moisture at the absorption point of the moisture absorbing material layer 21 in the second humidity measurement method is eliminated, and the error of humidity measurement caused by the moisture at the absorption point of the moisture absorbing material layer 21 can also be eliminated according to the experimental measurement, and is not specifically limited herein.
Optionally, the surface of the absorbent material layer 21 near the axis of the catheter 10 is a rough surface.
The surface of the absorbent material layer 21 near the axial center of the catheter 10 is a rough surface, i.e., the surface of the absorbent material layer 21 which absorbs moisture is a rough surface.
FIG. 2 is a schematic structural diagram of another apparatus for detecting humidity of gas based on potential difference according to an embodiment of the present invention; as shown in fig. 2, a layer of absorbent material 21 is optionally provided on both inner walls of the recess 20 and the inner wall of the duct 10.
The inner walls of the groove 20 and the inner wall of the conduit 10 are provided with moisture absorption material layers 21, namely, the conduit 10 and the inner wall of the groove 20 are wrapped by the moisture absorption material layers 21, so that the moisture absorption material layers 21 are firstly contacted and absorb the humidity in the gas to be measured.
Alternatively, the elastic coefficient of the flexible material layer 22 near the inner wall of the groove 20 is larger than the elastic coefficient of the flexible material layer 22 far from the inner wall of the groove 20.
The elastic coefficient of the flexible material layer 22 is set to be high in the middle, and the elastic coefficients of the two sides are low, so that the pressure acting on the piezoelectric material layer 23 at the middle position is small, the pressures at the two sides are large, and the piezoelectric material layer 23 can sense and detect the pressure more accurately.
FIG. 3 is a schematic structural diagram of another apparatus for detecting humidity of gas based on potential difference according to an embodiment of the present invention; as shown in fig. 3, optionally, a side of the piezoelectric material layer 23 close to the axial center of the catheter 10 is provided with a convex structure, and the flexible material layer 22 covers the convex structure of the piezoelectric material layer 23.
This piezoelectric material layer 23 top sets up to protruding structure, and this flexible material layer 22 covers this ventilative structure for the both ends of this flexible material layer 22 of gas expansion extrude simultaneously, and the sensitivity to the detection of the gas humidity that awaits measuring is higher.
Optionally, the material of the side of the conduit 10 remote from the space of the recess 20 is provided as a light-transmissive material.
Optionally, the material of the flexible material layer 22 is a non-thermal expansion and contraction material.
Optionally, the material of the piezoelectric material layer 23 is a non-thermal expansion and contraction material.
Set up the material of this flexible material layer 22 and piezoelectric material layer 23 into non-expend with heat and contract with cold material, avoid under the shining of infrared light, this gas that awaits measuring can release the heat, and this gas that awaits measuring takes place the inflation under thermal effect, this flexible material layer 22 and piezoelectric material layer 23 also take place the inflation under thermal effect, flexible material layer 22 and piezoelectric material layer 23 take place the inflation under thermal effect, can confuse because of the gas volume changes the inflation to flexible material layer 22, the production error, set up the material of flexible material layer 22 and piezoelectric material layer 23 into non-expend with heat and contract with cold material and avoided the existence of this error, the detection device who has increased this application detects the accuracy of the gas concentration that awaits measuring.
The detection device of gas humidity based on potential difference comprises a conduit 10, wherein two ends of the conduit 10 are respectively provided with an air inlet part 11 and an air inlet part 11, a raised groove 20 is arranged at the middle position of the conduit 10 to a position far away from the axis of the conduit 10, the space of the groove 20 and the space of the conduit 10 form a T-shaped space, one end of the groove 20 far away from the axis of the conduit 10 is respectively provided with a flexible material layer 22 and a piezoelectric material layer 23, wherein the flexible material layer 22 is close to the axis of the conduit 10, the piezoelectric material layer 23 is far away from the axis of the conduit 10, two ends of the piezoelectric material layer 23 are respectively provided with a first electrode 24 and a second electrode 25, and one side of the flexible material layer 22 far away from the piezoelectric material layer 23 in the groove 20 is provided with a moisture absorption material layer 21; when the humidity of the gas to be detected needs to be detected, the gas to be detected is input into the conduit 10 through the air inlet part 11 at one end of the conduit 10, the gas to be detected acts on the moisture absorption material layer 21, the moisture absorption material layer 21 absorbs moisture in the gas to be detected, so that the volume of the moisture absorption material layer 21 is changed, the pressure in the conduit 10 is further changed, under the action of the pressure, the flexible material layer 22 deforms and acts on the piezoelectric material layer 23, different charges of the piezoelectric material layer 23 are respectively gathered at two ends of the piezoelectric material layer 23 under the action of the pressure, the potential difference generated by the piezoelectric material under the action of the pressure can be detected through the first electrode 24 and the second electrode 25, and the humidity of the gas to be detected is obtained according to the corresponding relation between the potential difference and the humidity of the gas to be detected.
The application relates to a detection system of gas humidity based on potential difference, the detection system includes: the device comprises an electric potential measuring device, a computer and any one of the above detection devices for gas humidity based on electric potential difference, wherein the anode and the cathode of the electric potential measuring device are respectively electrically connected with the first electrode 24 and the second electrode 25 and are used for detecting the output electric potential difference of the detection device, and the computer is in communication connection with the electric potential measuring device and is used for receiving the electric potential difference detected by the electric potential measuring device and obtaining the humidity of the gas to be detected according to the corresponding relation between the electric potential difference and the humidity of the gas to be detected.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The gas humidity detection device based on the potential difference is characterized by comprising a guide pipe, wherein two ends of the guide pipe are respectively provided with an air inlet part and an air inlet part, a protruding groove is formed in the middle of the guide pipe towards a position far away from the axis of the guide pipe, the space of the groove and the space of the guide pipe form a T-shaped space, one end, far away from the axis of the guide pipe, of the groove is respectively provided with a flexible material layer and a piezoelectric material layer, the flexible material layer is close to the axis of the guide pipe, the piezoelectric material layer is far away from the axis of the guide pipe, two ends of the piezoelectric material layer are respectively provided with a first electrode and a second electrode, and one side, far away from the piezoelectric material layer, of the flexible material layer in the groove is provided with a moisture absorption material layer; the elastic coefficient of the flexible material layer close to the inner walls on the two sides of the groove is larger than that of the flexible material layer far away from the inner walls on the two sides of the groove; one side of the conduit, which is far away from the groove, is made of a light-transmitting material, and the flexible material layer and the piezoelectric material layer are made of non-thermal expansion and non-thermal contraction materials; in application, infrared light is applied to irradiate the gas in the conduit.
2. A device for detecting humidity of gas based on electric potential difference as claimed in claim 1, wherein the surface of said moisture-absorbing material layer near the axial center of said conduit is a rough surface.
3. A device for detecting the humidity of a gas based on a potential difference according to claim 1, wherein said moisture absorbing material layer is disposed on both side inner walls of said groove and inner walls of said duct.
4. A device for detecting humidity of gas based on electric potential difference as claimed in claim 1, wherein the piezoelectric material layer is provided with a convex structure on one side near the axial center of the conduit, and the flexible material layer covers the convex structure of the piezoelectric material layer.
5. A detection system for humidity of a gas based on a potential difference, the detection system comprising: the gas humidity detection device based on the potential difference comprises a potential measurement device, a computer and the gas humidity detection device based on the potential difference as claimed in any one of claims 1 to 4, wherein the anode and the cathode of the potential measurement device are respectively electrically connected with the first electrode and the second electrode for detecting the output potential difference of the detection device, and the computer is in communication connection with the potential measurement device for receiving the potential difference detected by the potential measurement device and obtaining the humidity of the gas to be detected according to the corresponding relation between the potential difference and the humidity of the gas to be detected.
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