CN207096028U - Measured oxygen concentration system - Google Patents
Measured oxygen concentration system Download PDFInfo
- Publication number
- CN207096028U CN207096028U CN201720888809.1U CN201720888809U CN207096028U CN 207096028 U CN207096028 U CN 207096028U CN 201720888809 U CN201720888809 U CN 201720888809U CN 207096028 U CN207096028 U CN 207096028U
- Authority
- CN
- China
- Prior art keywords
- gas circuit
- gas
- measurement
- oxygen concentration
- magnetic field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
Measured oxygen concentration system based on oxygen molecule paramagnetic properties, including measurement gas circuit, with reference to gas circuit, measurement air chamber, differential pressure pickup and electromagnetic component for providing variation magnetic field；Variation magnetic field acts on measurement air chamber, and measurement air chamber is with measurement gas circuit and with reference to gas circuit UNICOM, and respectively with measurement gas circuit and with reference to gas circuit UNICOM, the airline pressure measured between two gas circuits is poor at two pressure sensitive ends of differential pressure pickup；Due to the paramagnetic properties of oxygen, air chamber is measured under the effect of variation magnetic field, it is poor that differential pressure pickup both ends can produce airline pressure, the oxygen concentration information of tested gas is included in the airline pressure difference signal, and be modulated in the carrier frequency of electromagnetic component exciting current signal frequency, and demodulation after being amplified by analog circuit, analog-to-digital conversion obtain digital oxygen concentration signal.The anti-shake performance of the measured oxygen concentration method and system of the utility model design is good, low in energy consumption, and is resistant to null offset, and not only measurement accurately also has good robustness.
Description
Technical field
Measured oxygen concentration method and system is the utility model is related to, more particularly to utilizes the oxygen of oxygen molecule paramagnetic properties
Concentration measurement system.
Background technology
Oxygen concentration monitoring is indispensable in the fields such as modern clinic operation and associated treatment, food processing, chemical industry, automobile
One of crucial monitoring index, usual oxygen concentration analyzer is divided into different according to the difference of operation principle and application
Major class, including along magnetic oxygen analyzer, electric chemical formula oxygen analyser and laser type oxygen analyzer etc..
In the prior art, using the electric chemical formula oxygen analyser of zirconium oxide, occurred after running into oxygen using zirconium oxide
Electrochemical reaction, the electric current proportional to concentration is produced, so as to realize the measurement of oxygen concentration；But electric chemical formula oxygen analysis
The zirconium oxide that instrument uses is battery type, can not be measured again after material has gradually used up, it is necessary to regularly replace, price
It is expensive also inconvenient.
In the prior art, it is that make use of oxygen molecule to have a kind of very special spy using the suitable magnetic oxygen analyzer of paramagnetic method
Property, is exactly strong paramagnetism, i.e., oxygen molecule under magnetic fields can carrying magnetic, and can be attracted magnetically, oxygen can be utilized
This characteristic of gas analyzes the oxygen concentration in gas.Generally in the suitable magnetic oxygen analyzer of prior art, one is set
The magnetic field of specific gradient, a special dumbbell shaped torque induction coil is placed in the magnetic field, because the paramagnetic of oxygen arranges
Thrust is produced, causes the rotation of this coil, then original position is returned to by the above-mentioned coil of feedback current, at this moment in coil
Electric current is directly proportional to oxygen concentration, and so as to realize the measurement of oxygen concentration, this induction coil is exactly to have certain moment of torsion in fact
Mechanical rotation induction installation, by the way that the conversion of the current signal of induction coil is obtained into voltage signal, to realize oxygen signal number
Word, finally complete the real-time monitoring of oxygen concentration.
Along magnetic survey oxygen concentration, there is the characteristics of being influenceed without environment, the long-life, obtained extensively in medical science and industry
Application, at present paramagnetic oxygen measurement be based on magnetic field in moment of torsion rotate caused by current feedback, and this moment of torsion be need set
The accurate mechanical structure of meter could produce accurate change in torque, therefore can have following problem：Along magnetic oxygen analyzer
In order to keep the paramagnetic properties of oxygen, it is necessary to maintain the electromagnetic field of certain strength, generally make it that the overall power consumption of equipment is bigger than normal；By
The sensitivity of electromagnetic field intensity and mechanical rotation induction installation is directly depended in the precision of detection, to needing continuous detection oxygen
The occasion of the micro change of concentration is, it is necessary to the sensitivity of higher electromagnetic field intensity or mechanical rotation induction installation；Precision optical machinery fills
The cost of implementation put is high, and measurement meeting caused mechanical displacement vibrated influences, and equipment can not carry out oxygen concentration when serious
Measurement；And the accumulation of mechanical displacement deviation can be produced by vibrating needs to recalibrate operation to a certain extent afterwards, it is ensured that follow-up measurement
Accuracy；Material property during mechanical torque has is that persistently have decay with the time, can be progressively deteriorated after long-term use of,
Influence long-term use of measurement performance, it is also desirable to carry out school zero-sum calibration operation.
Utility model content
The technical problems to be solved in the utility model is to avoid prior art paramagnetic oxygen measurement system not antidetonation, power consumption
Greatly, the problem of null offset be present and propose a kind of oxygen measurement method and system.
The technical scheme that the utility model solves the above problems is that a kind of oxygen measurement method comprises the following steps：Step
①：Be provided for the tested gas measurement gas circuit flowed through and reference the gas circuit flowed through for reference gas, it is described measure gas circuit with
It is described to converge to form mixing gas circuit at measurement air chamber with reference to gas circuit；Differential pressure pickup is connected across measurement gas circuit and with reference to gas circuit
Between, make two pressure sensitive ends of differential pressure pickup respectively with measurement gas circuit and with reference to gas circuit UNICOM, for measuring the survey
The airline pressure measured between gas circuit and reference gas circuit is poor；Step is 2.：It is provided for providing change at the measurement air chamber of mixing gas circuit
The electromagnetic component of magnetizing field, the exciting current signal that the electromagnetic component receives is square-wave signal；The electromagnetic component produce and
Exciting current with frequency magnetic fields in mixing gas circuit measurement air chamber at；Step is 3.：When measure flowed through in gas circuit treat oxygen determination
The gas of gas concentration, during with reference to the reference gas that concentration known is flowed through in gas circuit, due to the paramagnetic properties of oxygen, differential pressure pickup
It is poor that measurement airline pressure can be produced between pressure difference sampled point and measurement air chamber in measurement gas circuit；Differential pressure pickup is in reference gas
It can be produced with reference to gas circuit pressure differential between pressure difference sampled point and measurement air chamber on road；Due to measuring the gas mixing at air chamber,
So that including the oxygen concentration information of tested gas in measurement gas circuit in the pressure difference signal of differential pressure pickup output, and quilt should be included
The pressure difference signal for surveying the oxygen concentration information of gas is modulated at the carrier frequency of the electromagnetic component exciting current signal frequency
On.
Frequency range for the current square-wave signal of the electromagnetic component excitation is 50 ~ 150 hertz；For the electromagnetism
Dutycycle of the square-wave signal of element exciting current in a period of change is 50% to 70%.
The oxygen concentration of volume percent scope flowed through with reference to gas circuit in reference gas is 0 ~ 21%.
A kind of above-mentioned oxygen measurement method is further comprising the steps of：Step is 4.：It is provided for measured oxygen concentration system control
The electric control gear of system；The microprocessor of system master is provided in the electric control gear, for controlling electromagnetic component to produce
The magnetic field control unit in magnetic field and the Simulation scale-up and digital measuring mould of the pressure difference signal processing exported for differential pressure pickup
Block；The magnetic field control unit controls the frequency and intensity size in the electromagnetic component output magnetic field；The magnetic field control unit
Receive the control of microprocessor；Step is 5.：The pressure difference of the oxygen concentration information of the differential pressure pickup output comprising tested gas
Signal, the pressure difference signal are modulated in the frequency of the electromagnetic component exciting current signal, and the pressure difference signal passes through the mould
Intend amplification and digitlization detection module is input to microprocessor；The microprocessor is joined according in the pressure difference signal and reference gas circuit
The oxygen concentration information in gas is examined, calculates the oxygen concentration obtained in tested gas.
A kind of above-mentioned oxygen measurement method is further comprising the steps of：Step is 6.：It is arranged as taking out for gas flowing power source
Air pump；The electric control gear is provided with aspiration pump control unit；The aspiration pump is arranged on one end of the mixing gas circuit, simultaneously
Gas mobilization dynamic is provided for measurement gas circuit and with reference to gas circuit；The aspiration pump receives the control of aspiration pump control unit, adjustment
Gas flow rate in the mixing gas circuit, measurement gas circuit and reference gas circuit；The aspiration pump control unit receives microprocessor
Control；7. step is provided for the temperature sensor of temperature survey；The temperature signal of the temperature sensor output passes through described
Simulation scale-up and digitlization detection module are input to microprocessor, and the microprocessor carries out temperature according to the temperature measuring data
The oxygen concentration spent in the tested gas after compensation calculation obtains temperature-compensating.
The technical scheme that the utility model solves the above problems can also be a kind of measured oxygen concentration system, including for
Measurement gas circuit that tested gas flows through, the reference gas circuit flowed through for reference gas, differential pressure pickup and change magnetic for providing
The electromagnetic component of field；The differential pressure pickup is connected across measurement gas circuit and with reference between gas circuit, makes two of differential pressure pickup to press
Power induction end is respectively with measurement gas circuit and with reference to gas circuit UNICOM, for measuring measurement gas circuit and with reference to the airline pressure between gas circuit
Difference；The measurement gas circuit and the reference gas circuit are converged to form mixing gas circuit at measurement air chamber；For providing variation magnetic field
Electromagnetic component is arranged at the measurement air chamber of mixing gas circuit；The exciting current signal that the electromagnetic component receives is square-wave signal；
The electromagnetic component produce and exciting current with frequency magnetic fields at the measurement air chamber of mixing gas circuit；Flowed when measuring in gas circuit
The oxygen to be measured crossed, during with reference to the reference gas that concentration known is flowed through in gas circuit, due to the paramagnetic properties of oxygen, differential pressure pickup
It is poor that measurement airline pressure can be produced between pressure difference sampled point and measurement air chamber in measurement gas circuit；Differential pressure pickup is in reference gas
It can be produced with reference to gas circuit pressure differential between pressure difference sampled point and measurement air chamber on road；Due to measuring the gas mixing at air chamber,
So that including the oxygen concentration information of tested gas in measurement gas circuit in the pressure difference signal of differential pressure pickup output, and quilt should be included
The pressure difference signal for surveying the oxygen concentration information of gas is modulated in the frequency of the electromagnetic component exciting current signal.
Frequency range for the current square-wave signal of the electromagnetic component excitation is 50 ~ 150 hertz；For the electromagnetism
Dutycycle of the square-wave signal of element exciting current in a period of change is 50% to 70%.
The oxygen concentration of volume percent scope flowed through with reference to gas circuit in reference gas is 0 ~ 21%.
Above-mentioned measured oxygen concentration system also includes the electric control gear for being used for the control of measured oxygen concentration system；
The electric control gear includes the microprocessor for system master, the magnetic of variation magnetic field is produced for electromagnetic component
Field control unit and the Simulation scale-up and digitlization detection module of the pressure difference signal processing exported for differential pressure pickup；The electricity
Magnetic cell receives the control of magnetic field control unit, the field frequency and intensity size of adjustment electromagnetic component output；The magnetic field control
Unit processed receives the control of microprocessor；The pressure difference signal of the differential pressure pickup output passes through the Simulation scale-up and digitlization
Detection module is input to microprocessor, and the microprocessor is according to the pressure difference signal and with reference to the oxygen in reference gas in gas circuit
Concentration information, calculate the oxygen concentration obtained in tested gas.
Above-mentioned measured oxygen concentration system also includes being used as the aspiration pump of gas flowing power source and for temperature survey
Temperature sensor（800）；The electric control gear also includes aspiration pump control unit；The aspiration pump is arranged on the mixing gas circuit
One end, while provide gas mobilization dynamic for measurement gas circuit and with reference to gas circuit；The aspiration pump receives aspiration pump control unit
Control, adjust the mixing gas circuit, measurement gas circuit and with reference to the gas flow rate in gas circuit；The aspiration pump control unit receives
The control of microprocessor；The temperature sensor（800）The temperature signal of output passes through the Simulation scale-up and digital measuring
Module is input to microprocessor, and the microprocessor carries out temperature-compensating and calculate acquisition temperature benefit according to the temperature measuring data
The oxygen concentration in tested gas after repaying.
Compared with the existing technology compared with the beneficial effects of the utility model are：1. obtained without setting accurate mechanical device
And oxygen concentration corresponding to mechanical torque signal, directly by oxygen concentration signals by the magnetic field modulation of change change pressure
In poor electric signal, just can be obtained by the electrical signal detection of pressure difference corresponding to oxygen concentration, that is, by oxygen concentration signals turn
Changed into and pressure difference electric signal corresponding to electric signal, rather than the change of a corresponding mechanical torque so that whole measuring system
Mechanical structure greatly simplify, the anti-shake performance of system greatly promotes, without carry out because vibrations caused by calibrate, also avoid
Due to measured deviation caused by vibrations, the accuracy of measurement and the performance of anti-vibration are improved；2. the magnetic field of change, it is only necessary to
Using exciting current of the square-wave signal of certain dutycycle as electromagnetism original paper, the long-term energy for maintaining stabilizing magnetic field is reduced
Amount consumption, more saves the energy；Suitable magnetic oxygen analyzer in compared with prior art, static magnetic field is maintained, it is necessary to DC current
The magnetic characteristic in magnetic field can be maintained always, the problem of power consumption is larger be present；And variation magnetic field of the present utility model can make generation magnetic field
Electric current be decreased to original half even it is less, the circuit power consumption of paramagnetic oxygen concentration testing equipment compared with the prior art is significantly
Reduce；3. the magnetic field of change so that pressure difference signal is modulated in a relatively high frequency, can be used exchange amplification, be kept away
Exempt from direct current amplification, reduced the difficulty of signal detection, improve the precision and accuracy of Concentration Testing；Exchange amplification causes
System can easily filter out the zero migration of system, eliminate influence of the zero migration to measured oxygen concentration so that oxygen concentration
The real-time and accuracy for detecting output greatly improve, and also reduce plant maintenance frequency, reduce the frequency of school zero-sum calibration；
Particularly when in human body respiration gasmetry, oxygen concentration excursion is small, therefore the change width of caused pressure difference signal
Degree is very weak, it is necessary to be amplified；And human body respiration oxygen concentration signal is a low frequency signal, it is necessary to be amplified using direct current, it is
System can have the drifting problem of direct current；And content of the present utility model is extraordinary solves above mentioned problem.
Brief description of the drawings
Fig. 1 is the principle schematic diagram of one of the utility model preferred embodiment；
Fig. 2 is the theory diagram of one of the utility model preferred embodiment；
The signified change variation magnetic fields to act in measurement gas circuit 100 and reference gas circuit 200 of label A in Fig. 1 and Fig. 2.
Embodiment
Utility model content is further detailed below in conjunction with Figure of description.
A kind of measured oxygen concentration system involved by preferred embodiment as shown in Figure 1, including for being tested gas stream
The measurement gas circuit 100 crossed, the reference gas circuit 200 flowed through for reference gas, differential pressure pickup 300 and for providing variation magnetic field
Electromagnetic component 500；The differential pressure pickup 300 is connected across measurement gas circuit 100 and with reference between gas circuit 200, makes pressure difference sensing
Two pressure sensitive ends of device 300 are respectively with measurement gas circuit 100 and with reference to the UNICOM of gas circuit 200, for measuring the He of gas circuit 100
It is poor with reference to the airline pressure between gas circuit 200；The measurement gas circuit 100 and the reference gas circuit 200 are converged at measurement air chamber 750
Close and form mixing gas circuit 700；Electromagnetic component 500 for providing variation magnetic field is arranged on the measurement air chamber 750 of mixing gas circuit 700
Place；The exciting current signal that the electromagnetic component 500 receives is square-wave signal；The electromagnetic component 500 produces and exciting current
Magnetic fields with frequency are at the measurement air chamber 750 of mixing gas circuit 700；When measuring the oxygen to be measured that is flowed through in gas circuit 100, reference
When the reference gas of concentration known is flowed through in gas circuit 200, due to the paramagnetic properties of oxygen, differential pressure pickup 300 is in measurement gas circuit
It is poor that measurement airline pressure can be produced between pressure difference sampled point and measurement air chamber 750 on 100；Differential pressure pickup 300 is in reference gas
It can be produced with reference to gas circuit pressure differential between pressure difference sampled point and measurement air chamber 750 on road 200；At measurement air chamber 750
Gas mixing so that the oxygen concentration that gas is tested in measurement gas circuit 100 is included in the pressure difference signal that differential pressure pickup 300 exports
Information, and the exciting current of electromagnetic component 500 should be modulated at comprising the pressure difference signal of the oxygen concentration information of tested gas
In the carrier frequency of signal frequency.The measurement air chamber 750 is simultaneously with measurement gas circuit 100 and with reference to the UNICOM of gas circuit 200, and pass through
Above-mentioned gas input is realized with the aspiration pump 600 of external connection, mixes and exports；The aspiration pump 600 is vavuum pump.The electricity
Magnetic cell 500 can be by the other forms of electric excitation generation variation magnetic field for common magnet coil or other forms
Element.
Based on a kind of measured oxygen concentration method of measured oxygen concentration system shown in Fig. 1, comprise the following steps：
Step is 1.：It is provided for the tested gas measurement gas circuit 100 flowed through and the reference gas circuit flowed through for reference gas
200, the measurement gas circuit 100 and the reference gas circuit 200 are converged to form mixing gas circuit 700 at measurement air chamber 750；By pressure difference
Sensor 300 is connected across measurement gas circuit 100 and with reference to the two pressure sensitive end point between gas circuit 200, making differential pressure pickup 300
Not with measurement gas circuit 100 and with reference to the UNICOM of gas circuit 200, for measuring the measurement gas circuit 100 and with reference to the gas between gas circuit 200
Road pressure differential；
Step is 2.：It is provided for providing the electromagnetic component 500 of variation magnetic field at the measurement air chamber 750 of mixing gas circuit 700,
The exciting current signal that the electromagnetic component 500 receives is square-wave signal；The electromagnetic component 500 produces and exciting current is the same as frequency
Magnetic fields in mixing gas circuit 700 measurement air chamber 750 at；
Step is 3.：When measuring the oxygen to be measured that is flowed through in gas circuit 100, with reference to the reference that concentration known is flowed through in gas circuit 200
During gas, due to the paramagnetic properties of oxygen, pressure difference sampled point of the differential pressure pickup 300 in measurement gas circuit 100 and measurement air chamber
It is poor that measurement airline pressure can be produced between 750；Pressure difference sampled point of the differential pressure pickup 300 on reference to gas circuit 200 and measurement gas
It can be produced with reference to gas circuit pressure differential between room 750；Due to the gas mixing at measurement air chamber 750 so that differential pressure pickup 300 is defeated
Comprising the oxygen concentration information that gas is tested in measurement gas circuit 100 in the pressure difference signal gone out, and the oxygen of tested gas should be included
The pressure difference signal of concentration information is modulated in the carrier frequency of the exciting current signal frequency of electromagnetic component 500.
As shown in figure 1, the scope of electromagnetic field is only limited near differential pressure pickup in figure；Actual variation magnetic field can be made
Use measurement gas circuit 100 and refer at the gas circuit port that gas circuit 200 is connected with differential pressure pickup, obtained so as to differential pressure pickup
Pressure difference signal preferably can be modulated in the frequency of alternating magnetic field.
In the preferred embodiment shown in fig. 1, the frequency range of variation magnetic field caused by the electromagnetic component 500 is 50
~ 150 hertz；Dutycycle of the variation magnetic field in a period of change caused by the electromagnetic component 500 is 50% to 70%, certainly
Can also be 60% or 66.6% grade other dutycycles, the time of impulse phase and the time of zero point phase can be according to electromagnetism
The magnetic field size requirement that the electromagnetic nature of element and measurement need is different and adjusts.Because measurement the ingenious of air chamber 750 sets
Mode is put, is modulated oxygen concentration signals even with variation magnetic field, the oxygen concentration signals of low frequency are modulated
Afterwards, the amplification using AC signal and the design of signal processing circuit are advantageous to；Characterize the pressure difference signal of oxygen concentration size
It is modulated at variation magnetic field with the carrier wave of frequency, the frequency of the carrier signal is the frequency of variation magnetic field, is put in experience exchange
After big, based on the corresponding pressure difference signal of carrier signal progress detection acquisition and oxygen concentration size.
The frequency range of variation magnetic field can also be 30,100,120,150 or 200 hertz in actual applications, specifically
Frequency range can be adjusted according to the output response characteristic of differential pressure pickup, that is to say, that change the frequency needs of electromagnetic field
Consider to match with the pressure difference of differential pressure pickup output response characteristic, and the matching with follow-up signal process circuit, signal transacting
The frequency response range of circuit should be more than the frequency range of electromagnetic field.
Oxygen concentration of volume percent scope in the reference gas flowed through with reference to gas circuit 200 is 0 ~ 21%, certainly
Concentration range that can also be higher, in principle the technical solution of the utility model be also suitable the optimal usage scenario of the certain this cases of
It is tested oxygen concentration range in 21% or so, i.e. air and the oxygen concentration range of people's breathing, based on such measurement demand,
It 0% can also 21% be used as zero reference that the scope selection of reference gas concentration, which can be,.School can certainly be carried out using 0%
Zero, it is used as being measured gas to carry out concentration calibration using 21% reference gas.
The oxygen concentration of volume percent in the reference gas flowed through with reference to gas circuit 200 can be with actual applications
It is the oxygen concentration range of other arbitrary contents；Certainly when for detecting the oxygen concentration composition in human body respiration gas,
System generally selects the concentration being used as with the oxygen concentration of volume percent in air or air with reference to oxygen so that is modulated at
It is inclined to the concentration in reference gas that pressure difference signal in exciting current signal frequency can embody tested gas phase to greatest extent
Difference value, be advantageous to that changing features amount is extracted and measured.Oxygen concentration in known air is relative constancy in volume
Percentage 21% or so, may be used as it is known refer to oxygen concentration, the reference oxygen that can also make a concentration known is dense
Degree.The oxygen for providing a known normal concentration makes reference, such as surrounding air, i.e. concentration of volume percent is 21% oxygen
Or pure nitrogen gas is 0% oxygen etc., the differential pressure reference signal for a caused benchmark；, can be tested when calibration
The zero point correction that reference gas realizes system is also passed into gas circuit.
Moreover, the parameter such as the caliber with reference to gas circuit, vapour lock and measurement gas circuit are completely the same, ensure gas in two gas circuits
The parameters such as rate of flow of fluid, air pressure, density are identical, to eliminate because of pressure gap caused by the difference of flow velocity, air pressure and density etc., carry
The accuracy of high oxygen concentration detection.
In a kind of measured oxygen concentration System Preferred embodiments as shown in Figure 2, for measured oxygen concentration system control
The electric control gear 900 of system；The electric control gear 900 includes the microprocessor 910 for system master, for electromagnetic component
The simulation of the magnetic field control unit 950 of 500 generation variation magnetic fields and the pressure difference signal processing exported for differential pressure pickup 300 is put
Big and digitlization detection module 930；The electromagnetic component 500 receives the control of magnetic field control unit 950, adjusts electromagnetic component
The field frequency and intensity size of 500 outputs；The magnetic field control unit 950 receives the control of microprocessor 910；The pressure difference
The pressure difference signal that sensor 300 exports is input to microprocessor 910 by the Simulation scale-up and digitlization detection module 930,
The microprocessor 910 calculates according to the pressure difference signal and with reference to the oxygen concentration information in reference gas in gas circuit and obtains quilt
The oxygen concentration surveyed in gas.
4. measured oxygen concentration method based on a kind of measured oxygen concentration system shown in Fig. 2 also includes step：Set
Electric control gear 900 for the control of measured oxygen concentration system；The micro- of system master is provided in the electric control gear 900
Processor 910, for controlling electromagnetic component 500 to produce the magnetic field control unit 950 in magnetic field and export for differential pressure pickup 300
Pressure difference signal processing Simulation scale-up and digitlization detection module 930；The magnetic field control unit 950 controls the electromagnetism member
Part 500 exports the frequency and intensity size in magnetic field；The magnetic field control unit 950 receives the control of microprocessor 910；Step
⑤：The pressure difference signal of the oxygen concentration information of the output of differential pressure pickup 300 comprising tested gas, the pressure difference signal are modulated
In the frequency of the exciting current signal of electromagnetic component 500, the pressure difference signal passes through the Simulation scale-up and digital measuring
Module 930 is input to microprocessor 910；The microprocessor 910 is according to the pressure difference signal and with reference in reference gas in gas circuit
Oxygen concentration information, calculate the oxygen concentration obtained in tested gas；Step is 6.：It is arranged as taking out for gas flowing power source
Air pump 600；The electric control gear 900 is provided with aspiration pump control unit 960；The aspiration pump 600 is arranged on the gaseous mixture
The one end on road 700, while provide gas mobilization dynamic for measurement gas circuit 100 and with reference to gas circuit 200；The aspiration pump 600 receives
The control of aspiration pump control unit 960, adjust the mixing gas circuit 700, measurement gas circuit 100 and with reference to the gas in gas circuit 200
Flow velocity；The aspiration pump control unit 960 receives the control of microprocessor 910；7. step is provided for the temperature of temperature survey
Sensor 700；The temperature signal that the temperature sensor 700 exports passes through the Simulation scale-up and digitlization detection module 930
Microprocessor 910 is input to, the microprocessor 910 carries out temperature-compensating and calculate acquisition temperature according to the temperature measuring data
The oxygen concentration in tested gas after compensation.
In a kind of measured oxygen concentration System Preferred embodiments as shown in Figure 2, in addition to it is used as gas mobilization dynamic
The aspiration pump 600 in source and the temperature sensor 800 for temperature survey；It is single that the electric control gear 900 also includes aspiration pump control
Member 960；The aspiration pump 600 is arranged on one end of the mixing gas circuit 700, while for measurement gas circuit 100 and refers to gas circuit 200
Gas mobilization dynamic is provided；The aspiration pump 600 receives the control of aspiration pump control unit 960, adjusts the mixing gas circuit
700th, gas circuit 100 is measured and with reference to the gas flow rate in gas circuit 200；The aspiration pump control unit 960 receives microprocessor 910
Control；The temperature signal that the temperature sensor 800 exports is inputted by the Simulation scale-up and digitlization detection module 930
To microprocessor 910, the microprocessor 910 carries out temperature-compensating and calculates acquisition temperature-compensating according to the temperature measuring data
The oxygen concentration in tested gas afterwards.
As shown in Fig. 2 air pump 600 shares for measurement gas circuit 100 and with reference to gas circuit 200 in figure, gas circuit 100 and reference are measured
Gas circuit 200 obtains different gas circuit flows, if the vapour lock of two-way gas circuit is suitable, both sides gas circuit according to the distribution of respective vapour lock
Flow is also suitable.In a kind of measured oxygen concentration system embodiment not shown in some drawings, in addition to it is used as gas stream
Move the measurement gas circuit aspiration pump of power source and refer to gas circuit aspiration pump；The electric control gear 900 also includes aspiration pump control unit
960；The measurement gas circuit aspiration pump provides gas mobilization dynamic for measurement gas circuit 100；It is described to refer to gas circuit aspiration pump reference gas
Road 200 provides gas mobilization dynamic；The measurement gas circuit aspiration pump and the gas circuit aspiration pump that refers to all receive aspiration pump control
The control of unit 960, adjustment measure gas circuit 100 and with reference to the gas flow rates in gas circuit 200 so that gas flow rate in two gas circuits
Control is within the deviation range of setting；The aspiration pump control unit 960 receives the control of microprocessor 910.In these realities
Apply in example, can be respectively measurement gas circuit 100 and respective independent air pump or other gas circuit power are set with reference to gas circuit 200
Element so that the gas flow of two gas circuits can be carried out with independent control by microcontroller according to the vapour lock of two parts gas circuit
The control of the flow of target, influence of the flow to measurement is preferably minimized.It is described to measure gas circuit 100 and closed with reference to gas circuit 200
Converge to form mixing gas circuit 700 in suitable position.
In a specific application, air is introduced in reference to gas circuit, i.e. concentration of volume percent is 21% oxygen
Or the reference gas of other known oxygen concentration such as 0% oxygen, it can be substituted with 100% nitrogen, in gas circuit is measured, introduce and be measured
Gas；Microprocessor controls aspiration pump to carry out the extraction of oxygen concentration gas and reference gas to be measured with certain speed of evacuation, treats
Gas and reference gas are measured respectively with approximately equalised flow velocity by measuring gas circuit and with reference to gas circuit；It is connected across and refers to gas circuit
The pressure detecting region of differential pressure pickup between measurement gas circuit introduces the tune of the variation magnetic field, such as 100 hertz of digital controllable
Frequency processed, a small pressure differential can be produced due to the paramagnetic properties of oxygen molecule with reference between gas circuit and measurement gas circuit,
Pulse magnetic pressure signal i.e. with variation magnetic field with frequency, the pulse magnetic pressure signal are converted into pressure difference signal by differential pressure pickup,
The pressure difference signal includes the oxygen concentration information being measured in gas, and the pressure difference signal is again by Simulation scale-up, filter
Ripple, and digitized processing are transferred to microprocessor, microprocessor is demodulated to above-mentioned pressure difference electric signal, feature recognition,
Calculate, after temperature-compensating and atmospheric pressure compensation, draw accurate oxygen density value, for further output and display.This
The anti-shake performance of the measured oxygen concentration method and system of utility model design is good, low in energy consumption, is resistant to the performance of null offset
Good, not only measurement accurately also has good robustness, fully digital output.
It was found from prior art, oxygen molecule is paramagnetism molecule, has paramagnetic feature, can be produced in certain magnetic field
Magnetization, paramagnetism arrangement is formed, so as to produce oxygen caused by oxygen molecule meeting after local small magnetic pressure, that is, paramagnetic arrangement
Gas pressure change caused by gas gas molecular motion characteristic variations itself inside gas circuit, this magnetic pressure size and oxygen are dense
Spend directly proportional.If introducing two gas circuits in a uniform magnetic field, wherein being used for oxygen to be measured all the way by the way that another way is used for
By the reference gas of known oxygen concentration, the pressure that a differential pressure pickup measures two gas circuits is bridged in two gas circuits
Difference, the differential pressure signal just contain measured oxygen concentration information, situation known to the oxygen concentration in reference gas
Under, according to the size of the pressure difference signal, measured oxygen concentration size is just can know that, so as to realize the oxygen concentration of paramagnetic method
Measurement.But the differential pressure signal amplitude of variation for generally so including tested gas concentration information is small, and resolution ratio is very low, and very
Difficulty realizes that uniform magnetic field is acted in measurement gas circuit and reference gas circuit, and generally pressure sensor is also magnetic-field-sensitive device in itself
Part, can be interfered cisco unity malfunction in magnetic field.
Technique effect of the present utility model also resides in, by being provided for carrying at the measurement air chamber 750 of mixing gas circuit 700
For the electromagnetic component 500 of variation magnetic field so that the gas at measurement air chamber 750 can be by magnetic fields；So that at measurement air chamber 750
It is poor relative to measurement airline pressure can be produced between pressure difference sampled point of the differential pressure pickup 300 in measurement gas circuit 100；Equally,
It can be produced with reference to gas circuit with reference between the pressure difference sampled point in gas circuit 200 relative to differential pressure pickup 300 at measurement air chamber 750
Pressure differential；And measure between airline pressure difference and reference gas circuit pressure differential due to the gas mixing at measurement air chamber 750, have
The pressure differential reference point of same benchmark, so that being connected across measurement gas circuit 100 and with reference to the differential pressure pickup between gas circuit 200
300 pressure difference signals measured are for measurement airline pressure difference and with reference to the pressure difference value between gas circuit pressure differential, the pressure difference value table
Oxygen concentration information in measurement gas circuit is levied；Air chamber 750 is measured by ingenious set so that even if pressure sensor is away from magnetic
, the tested oxygen concentration signals of sign can be also measured, and the oxygen concentration signals are modulated at magnetic also by such mode
In the frequency of field change；Pressure sensor is arranged on outside magnetic field so that differential pressure measurement is not easily susceptible to the interference of electromagnetic field, improves
The accuracy of measurement；Also so that the electromagnetism interference measure of system is greatly simplified；It is modulated at the change frequency in magnetic field
On oxygen concentration signals, also due to being modulated, the amplification of its follow-up signal and the relatively not modulated mistake of correlation procedure
Oxygen concentration signals it is more convenient.
Embodiment of the present utility model is the foregoing is only, not thereby limits the scope of the claims of the present utility model, it is every
The equivalent structure or equivalent flow conversion made using utility model specification and accompanying drawing content, or directly or indirectly it is used in it
The technical field of his correlation, is similarly included in scope of patent protection of the present utility model.
Claims (6)
- A kind of 1. measured oxygen concentration system, it is characterised in thatIncluding the measurement gas circuit flowed through for being tested gas（100）, the reference gas circuit that flows through for reference gas（200）, pressure difference Sensor（300）With the electromagnetic component for providing variation magnetic field（500）；The differential pressure pickup（300）It is connected across measurement gas circuit（100）With with reference to gas circuit（200）Between, make differential pressure pickup （300）Two pressure sensitive ends respectively with measure gas circuit（100）With with reference to gas circuit（200）UNICOM, for measuring gas circuit （100）With with reference to gas circuit（200）Between airline pressure it is poor；The measurement gas circuit（100）Gas circuit is referred to described（200）Surveying Measure air chamber（750）Converge to form mixing gas circuit in place（700）；For providing the electromagnetic component of variation magnetic field（500）It is arranged on mixing gas circuit（700）Measurement air chamber（750）Place；It is described Electromagnetic component（500）The exciting current signal of receiving is square-wave signal；The electromagnetic component（500）Produce and exciting current is the same as frequency Magnetic fields in mixing gas circuit（700）Measurement air chamber（750）Place；When measurement gas circuit（100）In the oxygen to be measured that flows through, with reference to gas circuit（200）In when flowing through the reference gas of concentration known, Due to the paramagnetic properties of oxygen, differential pressure pickup（300）In measurement gas circuit（100）On pressure difference sampled point with measurement air chamber （750）Between can produce measurement airline pressure it is poor；Differential pressure pickup（300）With reference to gas circuit（200）On pressure difference sampled point with Measure air chamber（750）Between can produce with reference to gas circuit pressure differential；Due to measuring air chamber（750）The gas mixing at place so that pressure difference Sensor（300）Measurement gas circuit is included in the pressure difference signal of output（100）In be tested the oxygen concentration information of gas, and this is included The pressure difference signal of the oxygen concentration information of tested gas is modulated at the electromagnetic component（500）The load of exciting current signal frequency In wave frequency rate.
- 2. measured oxygen concentration system according to claim 1, it is characterised in thatThe electromagnetic component（500）The frequency range of caused variation magnetic field is 50 ~ 150 hertz；The electromagnetic component（500）Production Dutycycle of the raw variation magnetic field in a period of change is 50% to 70%.
- 3. measured oxygen concentration system according to claim 1, it is characterised in thatIt is described to refer to gas circuit（200）It is 0 ~ 21% to flow through the oxygen concentration of volume percent scope in reference gas.
- 4. measured oxygen concentration system according to claim 1, it is characterised in thatAlso include the electric control gear for being used for the control of measured oxygen concentration system（900）；The electric control gear（900）Including the microprocessor for system master（910）, for electromagnetic component（500）Produce The magnetic field control unit of variation magnetic field（950）With for differential pressure pickup（300）The Simulation scale-up of the pressure difference signal processing of output With digitlization detection module（930）；The electromagnetic component（500）Receive magnetic field control unit（950）Control, adjust electromagnetic component（500）The magnetic field of output Frequency and intensity size；The magnetic field control unit（950）Receive microprocessor（910）Control；The differential pressure pickup （300）The pressure difference signal of output passes through the Simulation scale-up and digitlization detection module（930）It is input to microprocessor（910）, The microprocessor（910）According to the pressure difference signal and with reference to the oxygen concentration information in reference gas in gas circuit, calculate and obtain Oxygen concentration in tested gas.
- 5. measured oxygen concentration system according to claim 4, it is characterised in thatAlso include the temperature sensor for temperature survey（800）, the temperature sensor（800）The temperature signal of output passes through The Simulation scale-up and digitlization detection module（930）It is input to microprocessor（910）, the microprocessor（910）According to this Temperature measuring data, carry out the oxygen concentration in the tested gas after temperature-compensating calculates acquisition temperature-compensating.
- 6. measured oxygen concentration system according to claim 4, it is characterised in thatAlso include the aspiration pump for being used as gas flowing power source（600）；The electric control gear（900）It is single also to include aspiration pump control Member（960）；The aspiration pump（600）It is arranged on the mixing gas circuit（700）One end, while for measurement gas circuit（100）And reference gas Road（200）Gas mobilization dynamic is provided；The aspiration pump（600）Receive aspiration pump control unit（960）Control, adjust the mixing gas circuit（700）, measurement gas Road（100）With with reference to gas circuit（200）In gas flow rate；The aspiration pump control unit（960）Receive microprocessor（910）'s Control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720888809.1U CN207096028U (en) | 2017-07-21 | 2017-07-21 | Measured oxygen concentration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720888809.1U CN207096028U (en) | 2017-07-21 | 2017-07-21 | Measured oxygen concentration system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207096028U true CN207096028U (en) | 2018-03-13 |
Family
ID=61545708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720888809.1U Active CN207096028U (en) | 2017-07-21 | 2017-07-21 | Measured oxygen concentration system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207096028U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283091A (en) * | 2017-07-21 | 2019-01-29 | 深圳大学 | Measured oxygen concentration method and system |
| CN109459534A (en) * | 2018-11-30 | 2019-03-12 | 华东交通大学 | A kind of medical oxygen concentration monitor and alarm set |
-
2017
- 2017-07-21 CN CN201720888809.1U patent/CN207096028U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283091A (en) * | 2017-07-21 | 2019-01-29 | 深圳大学 | Measured oxygen concentration method and system |
| CN109459534A (en) * | 2018-11-30 | 2019-03-12 | 华东交通大学 | A kind of medical oxygen concentration monitor and alarm set |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107315150B (en) | Orthogonal fundamental mode fluxgate sensor | |
| CN207096028U (en) | Measured oxygen concentration system | |
| CN103245819B (en) | Magnetic excitation resonant piezoresistive cantilever beam is adopted to measure the method for DC current or DC voltage | |
| CN108534852A (en) | A kind of electromagnetic flowmeter and detection method based on dynamic detection | |
| CN111043946B (en) | Magnetic field interference noise test system for eddy current displacement sensor | |
| CN109283091A (en) | Measured oxygen concentration method and system | |
| CN110108299A (en) | A kind of online self-calibration system of silicon micromechanical gyroscope constant multiplier | |
| CN109116273B (en) | Quick-response negative feedback type GMI magnetic field measurement sensor | |
| CN108992068A (en) | A kind of phase compensating circuit, magnetic induction image device and phase compensating method | |
| CN108562778A (en) | A kind of open type current sensor and its control method | |
| CN111256865A (en) | TMR-based dual-frequency excitation magnetic nano temperature measurement method | |
| Zhong et al. | Influence of static magnetic field strength on the temperature resolution of a magnetic nanoparticle thermometer | |
| CN105548710B (en) | A kind of enhanced autobalance bridge and its method for realizing impedance measurement | |
| CN108020280B (en) | Unsteady state signal processing method of electromagnetic flowmeter under high-frequency excitation condition | |
| CN207181651U (en) | A kind of orthogonal basic mode fluxgate sensor | |
| CN112433186B (en) | Low-power nuclear magnetic resonance quantum magnetometer measurement system and measurement method thereof | |
| CN106546272B (en) | A kind of impedance sensor signal acquiring system | |
| CN105388348B (en) | A kind of enhanced autobalance bridge and its method for realizing open-loop compensation | |
| CN113466764A (en) | Generalized magnetoelectric effect measuring method with temperature compensation | |
| CN105403211A (en) | Closed-loop control system for nuclear magnetic resonance gyroscope of three working media | |
| CN101923152B (en) | Room temperature calibration method for equivalent error area of gradiometer | |
| CN204313899U (en) | A kind of electromagnetic flowmeter | |
| CN102645642B (en) | Temperature property testing device of amorphous metal fibers | |
| CN111505556A (en) | Method for measuring probe noise in fluxgate sensor | |
| CN201096843Y (en) | Detection device for measuring metal conductivity instrument based on backset phase |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |