CN114002311B - Low-drift paramagnetic oxygen sensor - Google Patents
Low-drift paramagnetic oxygen sensor Download PDFInfo
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- CN114002311B CN114002311B CN202111293789.0A CN202111293789A CN114002311B CN 114002311 B CN114002311 B CN 114002311B CN 202111293789 A CN202111293789 A CN 202111293789A CN 114002311 B CN114002311 B CN 114002311B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/74—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/74—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids
- G01N27/76—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids by investigating susceptibility
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/02—Neural networks
- G06N3/04—Architecture, e.g. interconnection topology
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/02—Neural networks
- G06N3/08—Learning methods
Abstract
The application relates to the technical field of detection equipment, in particular to low drift paramagnetic oxygen sensor, includes: the sensor comprises a sensor body, a sealing shell, a detection device and a control module, wherein the sealing shell is covered on the outer side of the sensor body and is communicated with an air inlet pipe and an air outlet pipe; the detection device is arranged outside the sealing shell and is used for detecting the gas parameters to be detected of the gas to be detected; the gas parameters to be measured comprise gas pressure and gas flow of the gas to be measured; the control module is connected to the air inlet valve, the air outlet valve and the detection device and controls the opening of the air inlet valve and the opening of the air outlet valve according to the parameters of the gas to be detected. This application is through being equipped with admission valve and the air outlet valve of adjusting gas flow and pressure on the sealed shell, realizes the control to external gas flow that awaits measuring, reduces the influence of gas pressure and gas flow fluctuation to the test result.
Description
Technical Field
The application relates to the field of measuring instruments, in particular to a low-drift paramagnetic oxygen sensor.
Background
Oxygen, as an important gas, has been widely used in medical care, industrial production, plateau work, aerospace, and the like. People use oxygen in production and life, the concentration of the oxygen must meet the use requirement, and if the oxygen concentration does not meet the standard or is not accurately controlled, serious accidents can be caused. Meanwhile, oxygen concentration needs to be strictly monitored by using oxygen measuring equipment in the processes of preparation, transportation and storage of oxygen.
The paramagnetic oxygen sensor in the related art can refer to chinese patent publication No. CN102224416A, which utilizes the principle of the magnetic mechanical method to measure the oxygen concentration.
With respect to the related art among the above, the inventors consider that the following drawbacks exist: the existing paramagnetic oxygen detection sensor is easily influenced by air pressure and flow, so that the measured oxygen concentration value has a drift phenomenon.
Disclosure of Invention
In order to reduce the influence of atmospheric pressure and air current to testing environment, this application provides a low drift paramagnetic oxygen sensor, adopts following technical scheme:
a low drift paramagnetic oxygen sensor comprising: the sensor comprises a sensor body, a sealing shell, a detection device and a control module, wherein the sealing shell is covered on the outer side of the sensor body and is communicated with an air inlet pipe and an air outlet pipe; the detection device is arranged outside the sealing shell and used for detecting the gas parameters to be detected of the gas to be detected;
the gas parameters to be measured comprise gas pressure and gas flow of the gas to be measured;
the control module is connected to the air inlet valve, the air outlet valve and the detection device, and controls the opening of the air inlet valve and the opening of the air outlet valve according to the parameters of the gas to be detected.
By adopting the technical scheme, the sealing shell is provided with the air inlet valve and the air outlet valve for adjusting the air flow and the pressure, so that the control on the external air flow to be tested is realized, and the influence of the air pressure and the air flow fluctuation on the test result is reduced.
Optionally, the control module includes a sample module, a calculation module and an adjustment module, when the control module controls the opening of the inlet valve and the opening of the outlet valve according to the parameter of the gas to be measured,
the sample module is used for acquiring historical input data and the historical output data; the historical input data are based on gas pressure and gas flow measured by reference gas in each test, and the historical output data represent oxygen concentration values; the calculation module is used for determining a correction value based on the historical input data, the historical output data and the gas parameter to be measured;
and the adjusting module is used for adjusting the opening of the air inlet valve and the opening of the air outlet valve based on the correction value.
By adopting the technical scheme, the reference gas with known concentration is used as reference, the gas pressure and gas flow data with the minimum influence on the test result are obtained through multiple tests, and the gas pressure and gas flow data with the minimum influence on the test result and the gas parameter to be tested are used for generating the correction value to adjust the opening of the gas inlet valve and the opening of the gas outlet valve, so that the influence of the current gas pressure and gas flow entering the gas sensor on the test result is minimum.
Optionally, the gas sensor further comprises a temperature compensation module connected to the control module,
the temperature compensation module determines reference input data and reference output data according to the received historical input data and historical output data;
acquiring corresponding offset of the reference input data at different temperatures;
a compensation amount is determined based on the offset amount and the reference output data.
By adopting the technical scheme, after the reference input data corresponding to the gas pressure and the gas flow with the minimum influence on the test result is determined by controlling the variable method, the offset of the current reference input data under different temperature conditions is acquired to obtain the compensation quantity, so that the influence of temperature fluctuation on the test result is reduced.
Optionally, the sensor further comprises: and the impurity detection module is used for detecting the gas components of the gas to be detected and outputting component information.
Optionally, the impurity detection module is specifically configured to, when detecting a gas component of the gas to be detected and outputting component information:
acquiring characteristic information of each sample gas;
inputting the characteristic information of each sample gas into a neural network model to train the neural network model to obtain a trained neural network model;
and inputting the gas to be detected into the trained neural network model, and acquiring gas component information generated by the trained neural network model.
By adopting the technical scheme, the gas components in the gas to be tested are detected in real time to judge whether high-magnetization-rate gas influencing the test result exists or not, and the gas components can be prompted and can also be used as the reference of the oxygen concentration test result by prejudging the gas components.
Optionally, the characteristic information of the sample gas includes: infrared spectral information of the sample gas.
Optionally, a baffle is disposed at the air outlet of the air inlet pipe, and the baffle and the inner side wall of the sealed shell form two air outlets.
By adopting the technical scheme, the gas uniformly enters the sensor body through the two uniformly distributed gas outlets, and the pressure difference possibly caused by the gas to be detected is reduced.
Optionally, a metal shielding layer is disposed on the outer side of the sealing shell.
Through adopting above-mentioned technical scheme, can reduce the interference of external magnetic field to the sensor body through setting up the metal shielding layer.
Optionally, a resistance wire is arranged in the sealed shell and connected with a power supply.
By adopting the technical scheme, the temperature of the gas to be tested is adjusted through the resistance wire, and the influence of low temperature on the test result is reduced.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the air inlet valve and the air outlet valve for adjusting the air flow and the pressure are arranged on the sealing shell, so that the control of the air flow to be tested outside is realized, and the influence of the air pressure and the air flow fluctuation on the test result is reduced.
2. By controlling the variable method, after the reference input data corresponding to the gas pressure and the gas flow which have the smallest influence on the test result are determined, the offset of the current reference input data under different temperature conditions is acquired to obtain the compensation quantity, so that the influence of temperature fluctuation on the test result is reduced.
Drawings
Fig. 1 is a schematic cross-sectional view of a sensor according to an embodiment of the present application.
Description of the drawings: 1. a sensor body; 2. sealing the shell; 21. an air inlet pipe; 211. an intake valve; 22. an air outlet pipe; 221. an air outlet valve; 23. a baffle plate; 231. an air outlet; 24. a resistance wire; 25. and a metal shielding layer.
Detailed Description
The present application is described in further detail below with reference to fig. 1.
The embodiment of the application introduces a low drift paramagnetic oxygen sensor, includes: the sensor comprises a sensor body 1, a sealing shell 2, a detection device and a control module, wherein the sealing shell 2 is covered on the outer side of the sensor body 1 and is communicated with an air inlet pipe 21 and an air outlet pipe 22, the air inlet pipe 21 is provided with an air inlet valve 211, and the air outlet pipe 22 is provided with an air outlet valve 221.
The sensor body 1 comprises a closed air chamber, two pairs of magnetic pole blocks with opposite magnetic field intensity gradients are arranged in the closed air chamber, a tension wire with high sensitivity is vertically arranged between the two magnetic pole blocks, two dumbbell-shaped pellets filled with nitrogen are fixed on the tension wire through metal belts, and a plane mirror is arranged at the superposition position of the pellets and the tension wire and used for detecting the change of the rotation angle of the pellets. After the gas to be measured and the reference gas are introduced into the measuring gas chamber, because of the strong paramagnetic property of oxygen, when the gas is pressed, the small balls at the two ends are not stressed equally, and the tensile wires can rotate by taking the tensile wires as axes. For the metal strip support point, a turning moment is experienced. Conversely, the tension wire can generate a reset moment resisting the rotation of the small ball, and the two moments can finally reach an equilibrium state. During testing, the physical quantity for representing the concentration of oxygen in the sample gas is the balance position of the rotating moment and the restoring moment, and the deflection angle of the small ball is visually represented.
[A1]。
Further, in the present application, the detection device is disposed outside the sealed housing 2, and is used for detecting the gas parameter to be detected of the gas to be detected; the gas parameters to be measured comprise gas pressure and gas flow of the gas to be measured; the detection device comprises a pressure detection sensor and a flow detection sensor; the control module is connected to the air inlet valve 211, the air outlet valve 221 and the detection device, and controls the opening of the air inlet valve 211 and the opening of the air outlet valve 221 according to the parameters of the gas to be detected.
Specifically, in the embodiment of the present application, the control module includes a sample module, a calculation module, and an adjustment module, and when the control module controls the opening of the inlet valve 211 and the opening of the outlet valve 221 according to the parameter of the gas to be measured, the sample module is configured to obtain historical input data and historical output data; the historical input data are based on gas pressure and gas flow measured by reference gas in each test, and the historical output data represent oxygen concentration values; the calculation module is used for determining a correction value based on historical input data, historical output data and the gas parameter to be detected; and the adjusting module is used for adjusting the opening of the air inlet valve 211 and the opening of the air outlet valve 221 based on the correction value.
In the embodiment of the present application, a reference gas with a known oxygen concentration is used as an experimental object, and multiple sets of historical input data and historical output data are obtained to determine the influence of gas pressure and gas flow on the detection concentration, specifically, when the calculation module determines the correction value based on the historical input data, the historical output data, and the gas parameter to be detected, the calculation module is specifically configured to: determining reference input data and reference output data according to historical input data and historical output data; determining an input data difference value based on the gas parameter to be measured and the reference input data; an opening value is determined based on the input data difference.
The historical input data and the historical output data are shown in table 1:
TABLE 1
Wherein, the historical output data of the 4 th group of trials is the same as (or within the error range of) the actual oxygen concentration of the reference gas, which indicates that the influence of the gas pressure and the gas flow on the trial at the moment is minimum (or close to 0), and the historical input data of the 4 th group of trials is taken as the reference input data; at this time, an input difference value can be determined according to the difference value between the pressure intensity and the gas flow of the gas to be measured in the current external environment and the difference value between the pressure intensity and the gas flow in the sealed shell 2, so that the pressure intensity and the gas flow in the sealed shell 2 are equal to the reference input data; the mode of acquiring the gas pressure and the gas flow in the sealed shell 2 is to arrange a pressure sensor and a flow sensor in the sealed shell 2; after the input difference is calculated, the air pressure difference and the flow difference in the input difference can be converted into the opening degree of the air inlet valve 211 and the opening degree of the air outlet valve 221, and the air inlet valve 211 and/or the air outlet valve 221 are/is adjusted to make the air pressure and the air flow in the sealed shell 2 consistent with the reference input data (or within the error allowable range), so that the oxygen concentration detected by the sensor body 1 under the condition is minimally influenced by the air pressure and the air flow.
In addition, in the using process of the sensor body 1, the change of the external environment temperature may also affect the detection result of the sensor body 1, so the gas sensor provided in the embodiment of the application further includes a temperature compensation module connected to the control module, and the temperature compensation module receives the reference input data and the reference output data; acquiring corresponding offset of the reference input data at different temperatures; the compensation amount is determined based on the offset amount and the reference output data.
Specifically, the offset of the reference input data at each different temperature is obtained as shown in table 2:
TABLE 2
| Reference input data | Temperature of | Offset amount |
| a 4 ，b 4 | d 1 | e 1 |
| a 4 ，b 4 | d 2 | e 2 |
| a 4 ，b 4 | d 3 | e 3 |
| a 4 ，b 4 | d 4 | e 4 |
| a 4 ，b 4 | d 5 | e 5 |
Wherein, the influence of low temperature environment to sensor body 1 test result is great, therefore the temperature value d that this application embodiment set up 1 、d 2 、d 3 、d 4 、d 5 The temperature can be set to be lower than 0 ℃, a plurality of groups of high-temperature conditions can be added, the embodiment of the application adopts a control variable method, namely, after the gas pressure and the gas flow which have the minimum influence on the measurement result are determined, the influence of the temperature on the measurement result is calculated, and the test result of the sensor body 1 under the current temperature condition can be compensated according to the difference between the offset measured by the previous experiment and the oxygen concentration (namely, reference output data) measured by the current sensor body 1.
In order to further reduce the influence of low temperature environment to the test result, this application embodiment still is provided with and sets up the temperature compensation component in the sealed shell 2, the temperature compensation component is including setting up the resistance wire 24 in the sealed shell 2, resistance wire 24 is connected with the power, all be provided with the temperature sensor who is used for detecting gas temperature in sealed shell 2 outside and inside, when the gas temperature that temperature sensor detected is less than predetermined standard temperature, the control power supply, resistance wire 24 heats the gas that gets into in the sealed shell 2, the temperature of the gas that awaits measuring reaches predetermined standard temperature value in the sealed shell 2.
In addition, the high magnetic susceptibility gas impurity has a great influence on the measurement result, and in order to reduce the influence of the gas impurity on the measurement result in the use process of the sensor body 1, the sensor provided in the embodiment of the present application further includes: impurity detection module for when detecting the gaseous gas composition of awaiting measuring and output composition information, specifically be used for: acquiring characteristic information of each sample gas; inputting the characteristic information of each sample gas into a neural network model to train the neural network model to obtain a trained neural network model; and inputting the gas to be detected into the trained neural network model, and acquiring gas component information generated by the trained neural network model.
Wherein the characteristic information of the sample gas includes: infrared spectrum information of the gas, namely the sample gas is the gas formed by mixing at least one known high magnetic susceptibility gas and a reference gas. The method comprises the steps of knowing that a reference gas mixed with impurity high-magnetic-susceptibility gas is a training sample with a label, inputting the training sample into a neural network model, training the neural network model to obtain an output result, comparing the output result with the label, and adjusting parameters of the neural network model through a feedforward neural network, so that in the application process, when unknown mixed gas is input, the interference of the high-magnetic-susceptibility gas on test data can be recognized.
Further, besides the high-magnetic-permeability gas inside, the embodiment of the present application is further provided with a metal shielding layer 25 that reduces the interference of the external magnetic field to the sensor body 1, and the metal shielding layer 25 is disposed outside the sealing shell 2.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. 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 application.
Claims (6)
1. A low drift paramagnetic oxygen sensor, comprising: the sensor comprises a sensor body (1), a sealing shell (2), a detection device and a control module, wherein the sealing shell (2) is covered on the outer side of the sensor body (1) and is communicated with an air inlet pipe (21) and an air outlet pipe (22), the air inlet pipe (21) is provided with an air inlet valve (211), and the air outlet pipe (22) is provided with an air outlet valve (221); the detection device is arranged outside the sealed shell (2) and is used for detecting the gas parameters to be detected of the gas to be detected;
the gas parameters to be measured comprise gas pressure and gas flow of the gas to be measured;
the control module is connected with the air inlet valve (211), the air outlet valve (221) and the detection device, and controls the opening of the air inlet valve (211) and the opening of the air outlet valve (221) according to the gas parameter to be detected;
the control module comprises a sample module, a calculation module and an adjustment module, when the control module controls the opening of the air inlet valve (211) and the opening of the air outlet valve (221) according to the gas parameter to be detected,
the sample module is used for acquiring historical input data and historical output data; the historical input data is the gas pressure and the gas flow measured in each test based on the reference gas, and the historical output data represents the oxygen concentration value;
the calculation module is used for determining a correction value based on the historical input data, the historical output data and the gas parameter to be measured;
an adjustment module for adjusting the opening of the inlet valve (211) and the opening of the outlet valve (221) based on the correction value;
the low drift paramagnetic oxygen sensor further comprises a temperature compensation module connected to the control module,
the temperature compensation module determines reference input data and reference output data according to the received historical input data and historical output data;
acquiring offset of the reference input data corresponding to different temperatures;
determining a compensation amount based on the offset amount and the reference output data;
and a resistance wire (24) is arranged in the sealing shell (2), and the resistance wire (24) is connected with a power supply.
2. The low-drift paramagnetic oxygen sensor according to claim 1, further comprising: and the impurity detection module is used for detecting the gas components of the gas to be detected and outputting component information.
3. The low-drift paramagnetic oxygen sensor according to claim 2, wherein the impurity detection module, when detecting the gas component of the gas to be detected and outputting component information, is specifically configured to:
acquiring characteristic information of each sample gas;
inputting the characteristic information of each sample gas into a neural network model to train the neural network model to obtain a trained neural network model;
and inputting the gas to be detected into the trained neural network model, and acquiring gas component information generated by the trained neural network model.
4. The low drift paramagnetic oxygen sensor of claim 3 wherein the characteristic information of the sample gas comprises: infrared spectral information of the sample gas.
5. The low drift paramagnetic oxygen sensor according to claim 1, wherein a baffle (23) is arranged at the air outlet of the air inlet pipe (21), and the baffle (23) and the inner side wall of the sealing shell (2) form two air outlets (231).
6. The low drift paramagnetic oxygen sensor according to claim 1, characterized in that the outer side of the sealed housing (2) is provided with a metallic shield (25).
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