阅读说明：本技术 气体流速测量装置及系统 (Gas flow velocity measuring device and system ) 是由 吉鹏勃 范鸿 于 2021-07-27 设计创作，主要内容包括：本申请涉及气体流速测量装置及系统,具体而言,涉及气体流速检测领域。本申请提供的气体流速测量装置；当需要对待测气体流速进行检测时,将待测气体通入到该气体流速测量装置的气体腔中,在气体的压强作用下,石墨烯薄膜的形状发生改变,进而改变金属颗粒层中金属颗粒的间距,从而改变金属颗粒层中的金属颗粒与光信号的共振情况,光源产生的光信号在气体腔中与金属颗粒发生共振,由于金属颗粒层中的金属颗粒与光信号的共振情况发生改变,则到达光探测器的光信号的量发生改变,通过光探测器检测气体腔出射的光信号的共振波长的变化,并通过气体腔出射的共振波长的变化与待测气体流速的关系,得到气体流速。(The application relates to a gas flow velocity measuring device and system, in particular to the field of gas flow velocity detection. The application provides a gas flow rate measuring device; when the flow velocity of the gas to be detected needs to be detected, the gas to be detected is introduced into a gas cavity of the gas flow velocity measuring device, under the action of the pressure of the gas, the shape of the graphene film is changed, the distance between metal particles in the metal particle layer is further changed, the resonance condition between the metal particles and optical signals in the metal particle layer is changed, the optical signals generated by the light source resonate with the metal particles in the gas cavity, the amount of the optical signals reaching the optical detector is changed due to the change of the resonance condition between the metal particles in the metal particle layer and the optical signals, the change of the resonance wavelength of the optical signals emitted by the gas cavity is detected through the optical detector, and the gas flow velocity is obtained through the relationship between the change of the resonance wavelength emitted by the gas cavity and the flow velocity of the gas to be detected.)

1. A gas flow rate measurement device, the device comprising: the optical fiber resonance detector comprises a light source, an optical fiber, a gas cavity, a graphene film, a metal particle layer and an optical detector, wherein the light source and the gas cavity are respectively arranged on two sides of the optical fiber, an optical signal generated by the light source reaches the inside of the gas cavity through the optical fiber, the graphene film is arranged on the surface, opposite to the optical fiber, in the gas cavity, one side, close to the optical fiber, of the graphene film is provided with the metal particle layer, an air inlet and an air outlet are respectively formed in the two opposite surfaces of the gas cavity, and the optical detector is arranged on the side, far away from the optical fiber, of the gas cavity and used for detecting the resonance wavelength of the optical signal emitted from the gas cavity.

2. The gas flow rate measurement device according to claim 1, further comprising a first elastic portion and a second elastic portion, wherein the first elastic portion and the second elastic portion are respectively disposed at two ends of the graphene film for fixing the graphene film, and the first elastic portion is close to the gas inlet and the second elastic portion is close to the gas outlet.

3. The gas flow rate measurement device according to claim 2, wherein the elastic coefficient of the first elastic portion is smaller than the elastic coefficient of the second elastic portion.

4. The gas flow rate measurement device according to claim 3, further comprising: the first valve is arranged at the air inlet, the second valve is arranged at the air outlet, and the first valve and the second valve are respectively used for controlling the opening and the closing of the air inlet and the air outlet.

5. The gas flow rate measurement device according to claim 4, wherein the gas outlet and the gas inlet are asymmetrically disposed, and the gas inlet is disposed close to the optical fiber, and the gas outlet is disposed far from the optical fiber.

6. The gas flow rate measurement device according to claim 5, wherein the number of metal particles on a side of the metal particles of the metal particle layer close to the gas inlet is larger than the number of metal particles on a side close to the gas outlet.

7. The gas flow rate measurement device according to claim 6, wherein a material of the metal particle layer is a noble metal material.

8. A gas flow rate measurement system, the system comprising: the gas flow velocity measuring device comprises a processor, a display and the gas flow velocity measuring device according to any one of claims 1 to 7, wherein the display and the processor are sequentially electrically connected with an optical detector of the gas flow velocity measuring device, the processor is used for obtaining the gas flow velocity according to the relation between the resonance wavelength emitted by the gas cavity and the flow velocity of the gas to be measured, and the display is used for displaying the obtained gas flow velocity.

Technical Field

The application relates to the field of gas flow velocity detection, in particular to a gas flow velocity measuring device and system.

Background

The flow rate of the gas is expressed by the volume of the gas passing through the column or the detector in unit time, the unit is milliliter/minute, the method for measuring the flow rate of the gas is more, and in the gas chromatography, the flow rate of the gas is smaller, the flow rate of the carrier gas and the hydrogen is 20-150 ml/minute, and the flow rate of the air is 200-1000 ml/minute. The gas is less pressurized where the flow rate is high and more pressurized where the flow rate is low.

In the prior art, an infrared sensor is generally used for measuring the flow rate of gas in a pipeline, and in practical application, the infrared sensor is used for measuring the flow rate of gas in the pipeline, and the flow rate of gas is measured by detecting the fingerprint spectrum of the gas.

However, the infrared sensor in the prior art has low sensitivity, large volume, heavy weight, high cost and complex operation, and is difficult to meet the requirement of simply measuring the gas flow rate.

Disclosure of Invention

The present invention aims to provide a gas flow rate measuring device and system to solve the problems of low sensitivity, large size, heavy weight, high cost, complex operation and difficulty in meeting the requirement of simple measurement of gas flow rate of the infrared sensor in the prior art.

In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:

in a first aspect, the present application provides a gas flow rate measurement device comprising: the light source, optic fibre, the gas chamber, graphite alkene film, metal particle layer and light detector, the both sides of optic fibre are provided with light source and gas chamber respectively, and the light signal that the light source produced passes through optic fibre and reaches the inside in gas chamber, the inside face relative with optic fibre of gas chamber sets up to graphite alkene film, one side that graphite alkene film is close to optic fibre is provided with the metal particle layer, be provided with air inlet and gas outlet on two relative faces in gas chamber respectively, one side of optic fibre is kept away from in the light detector setting in gas chamber, a resonance wavelength for detecting the light signal of gas chamber outgoing.

Optionally, the device further includes a first elastic portion and a second elastic portion, where the first elastic portion and the second elastic portion are respectively disposed at two ends of the graphene film and used for fixing the graphene film, the first elastic portion is close to the air inlet, and the second elastic portion is close to the air outlet.

Optionally, the elastic coefficient of the first elastic part is smaller than the elastic coefficient of the second elastic part.

Optionally, the apparatus further comprises: the first valve is arranged at the air inlet, the second valve is arranged at the air outlet, and the first valve and the second valve are respectively used for controlling the opening and the closing of the air inlet and the air outlet.

Optionally, the air outlet and the air inlet are asymmetrically arranged, and the air inlet is arranged close to the optical fiber and the air outlet is arranged far away from the optical fiber.

Optionally, the number of the metal particles on the side of the metal particles close to the gas inlet is greater than the number of the metal particles on the side close to the gas outlet.

Optionally, the material of the metal particle layer is a noble metal material.

In a second aspect, the present application provides a gas flow rate measurement system, the system comprising: the gas flow velocity measuring device comprises a processor, a display and the gas flow velocity measuring device of any one of the first aspect, wherein the display and the processor are sequentially electrically connected with an optical detector of the gas flow velocity measuring device, the processor is used for obtaining the gas flow velocity according to the relation between the resonance wavelength emitted by the gas cavity and the flow velocity of the gas to be measured, and the display is used for displaying the obtained gas flow velocity.

The invention has the beneficial effects that:

the application provides a gas flow rate measuring device, the device includes: the optical fiber resonance detector comprises a light source, an optical fiber, a gas cavity, a graphene film, a metal particle layer and a light detector, wherein the light source and the gas cavity are respectively arranged on two sides of the optical fiber, a light signal generated by the light source reaches the inside of the gas cavity through the optical fiber, the graphene film is arranged on the surface, opposite to the optical fiber, in the gas cavity, the metal particle layer is arranged on one side, close to the optical fiber, of the graphene film, an air inlet and an air outlet are respectively arranged on the two opposite surfaces of the gas cavity, and the light detector is arranged on the side, far away from the optical fiber, of the gas cavity and used for detecting the change of the resonance wavelength of the light signal emitted from the gas cavity; when the flow rate of the gas to be detected needs to be detected, the gas to be detected is introduced into a gas cavity of the gas flow rate measuring device, because the graphene film has toughness, under the action of the pressure of the gas, the shape of the graphene film is changed, the distance between metal particles in the metal particle layer on the graphene film is further changed, the resonance condition between the metal particles in the metal particle layer and optical signals is further changed, the optical signals generated by the light source are transmitted into the gas cavity through the optical fibers and are resonated with the metal particles in the gas cavity, so that the energy of partial optical signals is absorbed, the rest energy passes through the graphene film, and because the graphene film changes the resonance condition between the optical signals and the metal particle layer, the quantity of the optical signals reaching the optical detector through the graphene film is further changed, the change of the resonance wavelength of the optical signal through light detector detection gas chamber outgoing to through the relation of the change of the resonance wavelength of gas chamber outgoing and the gas velocity of flow that awaits measuring, obtain the gas velocity of flow, because this application turns into the optics problem with the problem of gas velocity of flow, and then make the detection to the gas velocity of flow more accurate, and sensitivity is higher, and the device simple structure of this application, easy operation can satisfy simple and carry out measuring requirement to the gas velocity of flow.

Drawings

Fig. 1 is a schematic structural diagram of a gas flow rate measuring device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of another gas flow rate measuring device according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of another gas flow rate measuring device according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of another gas flow rate measurement device according to an embodiment of the present invention.

Icon: 10-a light source; 20-an optical fiber; 30-a gas chamber; 31-an air inlet; 32-air outlet; 40-graphene thin films; 50-a layer of metal particles; 60-a light detector; 70-a first elastic portion; 80-a second elastic portion; 90-a first valve; 91-second valve.

Detailed Description

The purpose, technical solution and advantages of the embodiments of the present invention will be more clearly understood, and the embodiments of the present invention will be further described in detail with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

Fig. 1 is a schematic structural diagram of a gas flow rate measuring device according to an embodiment of the present invention; as shown in fig. 1, the present application provides a gas flow rate measuring device, the device comprising: light source 10, optic fibre 20, gas chamber 30, graphite alkene film 40, metal particle layer 50 and light detector 60, the both sides of optic fibre 20 are provided with light source 10 and gas chamber 30 respectively, and the light signal that light source 10 produced reaches the inside of gas chamber 30 through optic fibre 20, the inside face relative with optic fibre 20 of gas chamber 30 sets up to graphite alkene film 40, one side that graphite alkene film 40 is close to optic fibre 20 is provided with metal particle layer 50, be provided with air inlet 31 and gas outlet 32 on two relative faces of gas chamber 30 respectively, light detector 60 sets up the one side that optic fibre 20 was kept away from at gas chamber 30, a resonance wavelength for detecting the light signal of gas chamber 30 outgoing.

The two ends of the optical fiber 20 are respectively provided with a light source 10 and a gas cavity 30, the light source 10 generally adopts a laser light source 10, the shape of the gas cavity 30 is determined according to actual needs, and is not specifically limited herein, in practical application, the gas cavity 30 is generally arranged in a rectangular parallelepiped cavity structure, one surface of the rectangular parallelepiped cavity structure is arranged as a graphene film 40, one end of the optical fiber 20, which is far away from the light source 10, extends into the gas cavity 30, and the optical fiber 20 is arranged opposite to the graphene film 40, so that an optical signal generated by the light source 10 is directly transmitted to the graphene film 40 through the optical fiber 20, one side of the graphene film 40, which is close to the optical fiber 20, is provided with a metal particle layer 50, generally, the length of the metal particles on the metal particle layer 50 is nano-sized, the nano-sized metal particles are arranged on the metal particle layer 50, so that the optical signal reaches the graphene film 40, the optical signal is coupled with the metal particles on the metal particle layer 50, that is, the optical signal resonates with the metal particles of the metal particle layer 50, so that part of energy of the optical signal is absorbed by the metal particles of the metal particle layer 50, and further, the intensity of the optical signal changes, the remaining optical signal reaches the graphene film 40 through the metal particle layer 50, and is transmitted to the optical detector 60 through the graphene film 40, the optical detector 60 is used for detecting the change of the resonance wavelength of the optical signal emitted from the gas cavity 30, and two opposite surfaces of the gas cavity 30 are respectively provided with the gas inlet 31 and the gas outlet 32, generally, the gas inlet 31 and the gas outlet 32 can be respectively perpendicular to the axis of the optical fiber 20, the gas inlet 31 and the gas outlet 32 are respectively used for gas inlet and gas outlet, when the gas flow rate needs to be measured, the gas to be measured is introduced into the gas inlet 31 of the gas cavity 30, because the graphene film 40 has certain elasticity, the graphene film 40 deforms under the action of the gas to be detected, that is, the graphene film 40 rises or sinks, the shape of the graphene film 40 changes, so that the metal particle layer 50 also deforms, and further the distance between the metal particles in the metal particle layer 50 on the graphene film 40 is changed, so that the resonance condition between the metal particles in the metal particle layer 50 and the optical signal is changed, the optical signal generated by the light source 10 is transmitted into the gas cavity 30 through the optical fiber 20, and resonates with the metal particles in the gas cavity 30, so that part of the energy of the optical signal is absorbed, and the rest of the energy passes through the graphene film 40, because the graphene film 40 changes the resonance condition between the optical signal and the metal particle layer 50, so that the amount of the optical signal reaching the optical detector 60 through the graphene film 40 changes, the change of the resonance wavelength of the optical signal emitted from the gas cavity 30 is detected through the optical detector 60, and the gas flow velocity is obtained through the relation between the change of the resonance wavelength emitted from the gas cavity 30 and the flow velocity of the gas to be detected, because the problem of the gas flow velocity is converted into an optical problem in the application, the detection of the gas flow velocity is more accurate, the sensitivity is higher, the device of the application has a simple structure and is simple to operate, and the simple requirement for measuring the gas flow velocity can be met, in practical application, the size of the gas cavity 30, the sizes of the gas inlet 31 and the gas outlet 32 are determined according to the actual requirement, no specific limitation is made here, and the device of the application is convenient for measurement in various occasions; in addition, since the gas flow rate is calculated by using the optical parameters, the gas flow rate calculated by the design has high sensitivity because the change of light is sensitive; because the optical fiber transmission signal loss is low and the anti-interference capability is strong, the measured signal is slightly influenced by the loss of the signal and the interference of an external signal, so that the gas flow velocity is more accurately detected by the method; and because the device of this application is provided with the gas vent, after the measurement is accomplished, accessible gas vent continues to measure next time with the gas suction, can realize used repeatedly many times.

FIG. 2 is a schematic structural diagram of another gas flow rate measuring device according to an embodiment of the present invention; as shown in fig. 2, optionally, the apparatus further includes a first elastic part 70 and a second elastic part 80, where the first elastic part 70 and the second elastic part 80 are respectively disposed at two ends of the graphene film 40 and are used for fixing the graphene film 40, and the first elastic part 70 is close to the air inlet 31 and the second elastic part 80 is close to the air outlet 32.

The material of this first elastic component 70 and second elastic component 80 is elastic material, deformation can take place for this first elastic component 70 and second elastic component 80 under the effect of power promptly, this first elastic component 70 and second elastic component 80 are used for fixing this graphite alkene film 40, when needs detect the gaseous velocity of flow of awaiting measuring, this first elastic component 70 and second elastic component 80 take place deformation under the effect of gas pressure, and then make the degree of deformation of this graphite alkene layer bigger, thereby make the degree of deformation of this metal particle layer 50 change greatly, and then make the device of this application sensitive accuracy more to the detection of gaseous velocity of flow, in practical application, be first elastic component 70 near this air inlet 31, be second elastic component 80 near this air outlet 32.

Alternatively, the elastic coefficient of the first elastic portion 70 is smaller than that of the second elastic portion 80.

The elastic coefficient of the first elastic part 70 is set to be smaller than that of the second elastic part 80, that is, the elastic coefficient of the first elastic part 70 close to the gas inlet 31 is smaller, and the elastic coefficient of the second elastic part 80 close to the gas outlet 32 is larger, so that when the gas to be detected passes through the gas cavity 30, the deformation amount of one end, close to the gas outlet 32, of the graphene film 40 is larger than that of one end, close to the gas inlet 31, so that the change of the angle of the graphene film 40 is caused, incident light is inclined relative to metal particles, surface plasmon resonance between the metal particles is changed greatly, the change of the resonance wavelength reaching the optical detector 60 is larger, and the sensitivity of the device for detecting the flow velocity of the gas is increased.

FIG. 3 is a schematic structural diagram of another gas flow rate measuring device according to an embodiment of the present invention; as shown in fig. 3, optionally, the apparatus further comprises: a first valve 90 and a second valve 91, the first valve 90 being disposed at the air inlet 31, the second valve 91 being disposed at the air outlet 32, the first valve 90 and the second valve 91 being used to control the opening and closing of the air inlet 31 and the air outlet 32, respectively.

The first valve 90 is disposed at the air inlet 31, the second valve 91 is disposed at the air outlet 32, the first valve 90 and the second valve 91 are respectively used for controlling the opening and closing of the air inlet 31 and the air outlet 32, controlling the first valve 90 can control whether the air inlet 31 is filled with air, controlling the second valve 91 to control whether the air outlet 32 is filled with air, and the first valve 90 and the second valve 91 are generally opened or closed at the same time.

FIG. 4 is a schematic structural diagram of another gas flow rate measuring device according to an embodiment of the present invention; as shown in fig. 4, alternatively, the air outlet 32 and the air inlet 31 are asymmetrically disposed, and the air inlet 31 is disposed near the optical fiber 20 and the air outlet 32 is disposed far from the optical fiber 20.

This gas outlet 32 and gas inlet 31 asymmetric setting, make this gas inlet 31 and this gas outlet 32 setting of staggering promptly, so set up and make gas inlet 31 be close to optic fibre 20, optic fibre 20 is kept away from to gas outlet 32, and then make the graphene film 40 that is in the upper portion far away from the inflow gas that awaits measuring, the pressure that receives is less, the graphene film 40 that is in the lower part is nearer from the inflow gas that awaits measuring, the pressure that receives is great, more step more make its angle of noble metal granule take place big change, thereby it is bigger to arouse the change that reaches the resonance wavelength of light detector 60, more increase measuring sensitivity and accuracy.

Alternatively, the number of metal particles on the side of the metal particles of the metal particle layer 50 close to the gas inlet 31 is larger than the number of metal particles on the side close to the gas outlet 32.

The metal particles of the metal particle layer 50 on the graphene film 40 are set to be more metal particles on the upper half and less metal particles on the lower half. Because the upper portion has more noble metal particles, the quality of upper portion is greater than the lower part for when gaseous inflow, the angle of deflection of upper portion is less than the angle of deflection of lower part, thereby make the degree of deflection of 40 angles of graphene film bigger, this improvement makes the deformation of graphene film 40 upper half relative with the latter half smaller promptly, make the degree of deflection of 40 angles of graphene film bigger, thereby it is bigger to cause the change of the resonance wavelength who reachs light detector 60, the sensitivity of measurement of increase more.

Optionally, the material of the metal particle layer 50 is a noble metal material.

The material of the metal particle layer 50 may be one of noble metals, or may be a plurality of noble metals, and is not particularly limited herein.

The application provides a gas flow rate measuring device, the device includes: the optical fiber detection device comprises a light source 10, an optical fiber 20, a gas cavity 30, a graphene film 40, a metal particle layer 50 and a light detector 60, wherein the light source 10 and the gas cavity 30 are respectively arranged on two sides of the optical fiber 20, a light signal generated by the light source 10 reaches the inside of the gas cavity 30 through the optical fiber 20, the graphene film 40 is arranged on the surface, opposite to the optical fiber 20, in the gas cavity 30, one side, close to the optical fiber 20, of the graphene film 40 is provided with the metal particle layer 50, the metal particle layer 50 is metal particles with nanometer sizes, the two opposite surfaces of the gas cavity 30 are respectively provided with a gas inlet 31 and a gas outlet 32, the gas inlet 31 and the gas outlet 32 are respectively vertical to the axis of the optical fiber 20, and the light detector 60 is arranged on the side, far away from the optical fiber 20, and is used for detecting the change of the resonance wavelength of the light signal emitted from the gas cavity 30; when the flow rate of the gas to be detected needs to be detected, the gas to be detected is introduced into the gas cavity 30 of the gas flow rate measuring device, because the graphene film 40 has toughness, under the action of the pressure of the gas, the shape of the graphene film 40 changes, so that the distance between metal particles in the metal particle layer 50 on the graphene film 40 is changed, and further the resonance condition between the metal particles in the metal particle layer 50 and optical signals is changed, the optical signals generated by the light source 10 are transmitted into the gas cavity 30 through the optical fiber 20, and resonate with the metal particles in the gas cavity 30, so that part of the energy of the optical signals is absorbed, and the rest of the energy passes through the graphene film 40, because the graphene film 40 changes the resonance condition between the optical signals and the metal particle layer 50, so that the amount of the optical signals reaching the optical detector 60 through the graphene film 40 changes, detect the change of the resonance wavelength of the optical signal of gas chamber 30 outgoing through light detector 60 to the relation of the change of the resonance wavelength of gas chamber 30 outgoing and the gas velocity of flow that awaits measuring obtains the gas velocity of flow, because this application turns into the optical problem with the problem of gas velocity of flow, and then makes the detection to the gas velocity of flow more accurate, and sensitivity is higher, and the device simple structure of this application, easy operation can satisfy the simple requirement of carrying out the measurement to the gas velocity of flow.

The application provides a gas velocity of flow measurement system, the system includes: the gas flow velocity measuring device comprises a processor, a display and any one of the gas flow velocity measuring devices, wherein the display and the processor are sequentially electrically connected with an optical detector 60 of the gas flow velocity measuring device, the processor is used for obtaining the gas flow velocity according to the relation between the change of the resonance wavelength emitted by the gas cavity 30 and the flow velocity of the gas to be measured, and the display is used for displaying the obtained gas flow velocity.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.