CN106094897A - A kind of computer based gas concentration lwevel monitoring system - Google Patents
A kind of computer based gas concentration lwevel monitoring system Download PDFInfo
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- CN106094897A CN106094897A CN201610470934.0A CN201610470934A CN106094897A CN 106094897 A CN106094897 A CN 106094897A CN 201610470934 A CN201610470934 A CN 201610470934A CN 106094897 A CN106094897 A CN 106094897A
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- gas concentration
- concentration lwevel
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- carbon dioxide
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
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Abstract
The invention discloses a kind of computer based booth gas concentration lwevel monitoring system, it is characterised in that including: gas concentration lwevel sensor, temperature sensor, numeric processing unit, optical sensor, control unit；Temperature sensor connects the first input end of numeric processing unit, and the outfan of gas concentration lwevel sensor connects the second input of numeric processing unit, and the outfan of numeric processing unit connects the first input end of control unit；Optical sensor outfan connects the second input of control unit；Control unit is according to optical sensor Data Control dioxide bottle output flow and carries out concentration overload alarm.The present invention obtains gas concentration lwevel and compensates and temperature curve, measures concentration and carbon dioxide offset according to the carbon dioxide gathered, it is thus achieved that equivalence gas concentration lwevel；Control the output flow of dioxide bottle finally according to gas concentration lwevel and Lighting information, reach accurately to control the purpose of booth carbon dioxide.
Description
Technical field
The present invention relates to carbon dioxide concentration measurement field, particularly relate to a kind of carbon dioxide concentration measurement system.
Background technology
CO2Being that green plants carries out one of photosynthetic primary raw material, plant often generates 100g dry, needs to absorb
150g CO2.Warmhouse booth cultivation makes crop be chronically in the most airtight place, and CO in canopy2Consumption is big, need to be to CO2
Concentration is monitored and compensates consumption.Crop needs CO2Concentration is generally 1 ‰～1.5 ‰.CO2Concentration too low, blade photosynthetic
Effect is basic to be stopped, and seriously hinders the growth of crop, it is necessary to supplement the deficiency of this gas in canopy by enriching CO2.Meanwhile,
When CO2 excessive concentration, cause again vegetable crop leaf rolling, affect the crop absorption to oxygen, it is impossible to breathe normally
Metabolism, makes temperature of shed raise rapidly, causes the high temperature damage of vegetable crop.The most how CO2 in Effective Regulation greenhouse
Concentration just becomes a major issue of greenhouse plantation.
Existing sensor producer is that employing experience penalty method is to carry out the temperature of gas concentration lwevel sensor the most mostly
Compensate, on the product of all same batches, i.e. add same compensation resistance, re-test after compensation, the most repeatedly revise according to drift value
Resistance value, such temperature compensation efficiency is low, and the compensation precision of this gas concentration lwevel Sensor Temperature Compensation method
Also can not get ensureing.Additionally, in relevant carbon dioxide concentration measurement field, there is error, exist in existing density sensor measurement
Noise；Meanwhile, for averaging, there is bigger measurement by mistake in existing digital filtering Normal practice in the DATA REASONING of variation in real time
Difference.
Summary of the invention
Because the drawbacks described above of prior art, the technical problem to be solved is to provide a kind of based on computer
Gas concentration lwevel monitoring system, it is intended to the technology solving the precision that causes of temperature drift of carbon dioxide sensor poor is asked
Topic, reaches to improve the purpose of carbon dioxide concentration measurement precision.Within the system, initially set up gas concentration lwevel to compensate and temperature
Degree relation curve, and sensor acquisition carbon dioxide concentration value is carried out digital filtering process, add dense carbon dioxide the most again
The temperature-compensating of degree obtains equivalence carbon dioxide concentration value, is finally controlling dioxy according to carbon dioxide concentration value and illumination value
Change the output of carbon gas cylinder.This system can be effectively improved carbon dioxide concentration measurement precision.
For achieving the above object, the invention provides a kind of computer based booth gas concentration lwevel monitoring system,
Including: gas concentration lwevel sensor, temperature sensor, numeric processing unit, optical sensor, gas concentration lwevel control single
Unit；Temperature sensor connects the first input end of numeric processing unit, and the outfan of gas concentration lwevel sensor connects numerical value
Second input of processing unit, the outfan of numeric processing unit connects the first input of gas concentration lwevel control unit
End；Optical sensor outfan connects the second input of gas concentration lwevel control unit；Gas concentration lwevel control unit
According to optical sensor Data Control dioxide bottle output flow and carry out concentration overload alarm；
Wherein, numeric processing unit includes: gas concentration lwevel compensates and temperature relation fitting module, for matching dioxy
Change concentration of carbon and temperature curve；Abnormal data filtering module, for Exception Filter data；
Numeric weights average value processing module, for averaging to sampled data filtering；Temperature-compensating solves module, for right
Gas concentration lwevel sensor carries out temperature-compensating；Gas concentration lwevel solves module, is used for solving equivalence gas concentration lwevel
Value.
The invention provides a kind of computer based gas concentration lwevel monitoring system, first obtain gas concentration lwevel
Compensate and the relation curve of temperature；Secondly, obtained by gas concentration lwevel sensor and measure gas concentration lwevel, pass through temperature
Sensor obtains temperature value and calculates gas concentration lwevel offset, it is thus achieved that equivalence gas concentration lwevel；Finally according to titanium dioxide
Concentration of carbon and illumination value set the output flow of dioxide bottle.In the present invention, also measurement data is carried out abnormal number
Average with data weighting according to filtering, be effectively improved carbon dioxide concentration measurement precision.
Furthermore, abnormal data filtering module extracts nearest n sampling carbon dioxide concentration value P successivelyiCount
According to filtration, willPoint filter；k≥1.3、1≤i≤n,n≥10.
In time gas concentration lwevel detects, sensor produces test abnormity point because of environment and device factor.At this
Improving in technical scheme, abnormal data filtering module is for Exception Filter sampled point, to improve measuring accuracy.
Furthermore, numeric weights average value processing module is according to the sampling carbon dioxide concentration value after Exception Filter data
Seek weighted mean Wherein, n ' is the data volume after data filtering, 1≤j≤n '≤n, αjFor weight coefficient,
αj=n '+1-j.
In actual gas concentration lwevel detects, ambient carbon dioxide concentration is continually changing in real time, and dense carbon dioxide
The change of degree is continuous print.In this improvement technical scheme, the closer to present test data closer to existing environment dioxy
Changing concentration of carbon, its weight coefficient arranges higher, can be effectively improved measuring accuracy.
Furthermore, it is under debugging mode that gas concentration lwevel compensates with temperature relation fitting module, controls environment
Gas concentration lwevel remains P0, by gas concentration lwevel sensor respectively in temperature T1、T2、T3、T4、T5Test dense carbon dioxide
Degree, and record gas concentration lwevel offset Δ P at each temperature respectively1、ΔP2、ΔP3、ΔP4、ΔP5；Matching carbon dioxide
Concentration offsets value Δ P and temperature curve, it is thus achieved that relation curve: Δ P=aT4+bT3+cT2+dT3+e；A, b, c, d, e are many
Binomial coefficient, P0≥0。
In this improvement project, use fitting of a polynomial to go out gas concentration lwevel and compensate the relation curve with temperature, the party
Method only need to be chosen some temperature spots and test, and obtains relation curve by matching, it is possible to reduce the experiment test time, improves effect
Rate.
Furthermore, temperature-compensating solves module, according to gas concentration lwevel offset and temperature curve, it is thus achieved that
Gas concentration lwevel offset Δ P.
Under different temperatures, gas concentration lwevel offset is different.In this improvement technical scheme, temperature-compensating solves module
Obtain the temperature that temperature sensor records, by gas concentration lwevel offset and temperature curve, it is thus achieved that dense carbon dioxide
Degree offset.
Furthermore, gas concentration lwevel solves module, for by weighted meanWith gas concentration lwevel offset
Δ P summation obtains equivalence carbon dioxide concentration value P,To measuring and processing the dense carbon dioxide obtained through data
Angle value increases gas concentration lwevel and compensates, and can be effectively improved carbon dioxide concentration measurement precision.
Furthermore, gas concentration lwevel control unit exports according to optical sensor Data Control dioxide bottle
The method of flow is: if optical sensor data are less than setting value, then control closed electromagnetic valve dioxide bottle；If illumination passes
Sensor data are greater than or equal to setting value, then control dioxide bottle output flow according to gas concentration lwevel.In this technology
In scheme, under different illumination, photosynthesis of plant speed is the most different；When illumination abundance, it should more dioxy is provided
Change carbon and promote photosynthesis of plant；Otherwise, it should less carbon dioxide flow is provided.
The invention has the beneficial effects as follows: the invention provides a kind of computer based gas concentration lwevel monitoring system,
First obtain gas concentration lwevel to compensate and the relation curve of temperature；Secondly, measurement is obtained by gas concentration lwevel sensor
Gas concentration lwevel, obtains temperature value by temperature sensor and calculates gas concentration lwevel offset, it is thus achieved that equivalence titanium dioxide
Concentration of carbon；The output flow speed controlling dioxide bottle finally according to carbon dioxide concentration value and Lighting information reaches essence
Really control the purpose of booth gas concentration lwevel.In the present invention, also measurement data is carried out abnormal data filtration and data add
Power is averaged, and is effectively improved carbon dioxide concentration measurement precision.
Accompanying drawing explanation
Fig. 1 is the system framework figure of an embodiment of the present invention；
Fig. 2 is the gas concentration lwevel offset relation curve with temperature of an embodiment of the present invention；
Fig. 3 is the schematic flow sheet of an embodiment of the present invention.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings:
As it is shown in figure 1, provide a kind of computer based gas concentration lwevel monitoring system in the present embodiment, including:
Gas concentration lwevel sensor 1, temperature sensor 2, numeric processing unit 3 and gas concentration lwevel control unit 4；Temperature passes
Sensor 2 connects the first input end of numeric processing unit 3, and the outfan of gas concentration lwevel sensor 1 connects numerical value and processes single
Second input of unit 3, the outfan of numeric processing unit 3 connects gas concentration lwevel control unit 4；Gas concentration lwevel control
Unit 4 processed connects gas cylinder 5 and sensor 6.
Numeric processing unit 3 includes:
Gas concentration lwevel compensates and temperature relation fitting module 31, bent with temperature relation for matching gas concentration lwevel
Line；
Abnormal data filtering module 32, for Exception Filter data；
Numeric weights average value processing module 33, for averaging to sampled data filtering；
Temperature-compensating solves module 34, for gas concentration lwevel sensor is carried out temperature-compensating；
Gas concentration lwevel solves module 35, is used for solving equivalence carbon dioxide concentration value.
In the present embodiment, abnormal data filtering module 32 extracts nearest n sampling carbon dioxide concentration value P successivelyiEnter
Row data filtering, willPoint filter；Described k >=1.3,1≤i≤n, n >=10.
Gas concentration lwevel sensor 1 can set 0.1s～1s and transmit sampled data to data processing unit 3, in order to carry
High measuring accuracy, in the present embodiment, the sampling period is 0.1s.The dense carbon dioxide degrees of data choosing nearest 10 sample points is entered
Row processes.
In the present embodiment, described numeric weights average value processing module 33 is according to the sampling titanium dioxide after Exception Filter data
Concentration of carbon value seeks weighted mean Wherein, n ' is the data volume after data filtering, 1≤j≤n '≤n, αjFor
Weight coefficient, αj=n '+1-j.It is noted that the every 0.1s of gas concentration lwevel sensor 1 gathers a secondary environment titanium dioxide
Concentration of carbon data, the carbon dioxide concentration value measuring acquisition more closed on is closer to current time density value, so weight is the biggest.
In the present embodiment, it is under debugging mode that described gas concentration lwevel compensates with temperature relation fitting module 31,
Control ambient carbon dioxide concentration and remain P0, by gas concentration lwevel sensor 1 respectively in temperature T1、T2、T3、T4、T5Test
Gas concentration lwevel, and record gas concentration lwevel offset Δ P at each temperature respectively1、ΔP2、ΔP3、ΔP4、ΔP5；Intend
Close described gas concentration lwevel offset Δ P and temperature curve, it is thus achieved that relation curve: Δ P=aT4+bT3+cT2+dT3+e；
Described a, b, c, d, e are multinomial coefficient, described P0≥0。
By solving T β=v, wherein,
The value trying to achieve coefficient a, b, c, d, e can be calculated, as shown in Figure 2, it is thus achieved that gas concentration lwevel offset Δ P and temperature
Relation curve: Δ P=aT4+bT3+cT2+dT1+e；Wherein, a, b, c, d, e are multinomial coefficient.
In the present embodiment, described temperature-compensating solves module 34, according to described gas concentration lwevel offset and temperature
Relation curve, it is thus achieved that described gas concentration lwevel offset Δ P.
In the present embodiment, described gas concentration lwevel solves module 35, for by described weighted meanWith described two
Carbonoxide concentration offsets value Δ P summation obtains equivalence carbon dioxide concentration value P, describedTo measuring and through data
Process the carbon dioxide concentration value obtained and increase gas concentration lwevel compensation, carbon dioxide concentration measurement essence can be effectively improved
Degree.
In the present embodiment, if optical sensor data are less than setting value, then control closed electromagnetic valve dioxide bottle
5；If optical sensor data are greater than or equal to setting value, then control dioxide bottle output stream according to gas concentration lwevel
Amount.If gas concentration lwevel is higher than setting value, then alarm 6 is reported to the police.
If Fig. 3, Fig. 3 are the schematic flow sheet of present embodiment, in the present embodiment computer based dense carbon dioxide
The concrete steps that degree is measured include:
S1, under debugging mode, gas concentration lwevel compensate with temperature relation fitting module 31 sets up gas concentration lwevel
Compensate and temperature curve；
Under debugging mode, control ambient carbon dioxide concentration and remain P0, gas concentration lwevel sensor 1 is existed respectively
Temperature T1、T2、T3、T4、T5Test gas concentration lwevel, and record gas concentration lwevel offset Δ P at each temperature respectively1、
ΔP2、ΔP3、ΔP4、ΔP5；Matching gas concentration lwevel offset Δ P and temperature curve: Δ P=aT4+bT3+cT2+dT3
+e。
S2, in carbon dioxide concentration measurement, gas concentration lwevel sensor 1 gathers ambient carbon dioxide concentration value, temperature
Degree sensor 2 gathers ambient temperature value, dense carbon dioxide degrees of data is sent to abnormal data filtering module 32, by temperature data
It is sent to temperature-compensating and solves module 34.
The dense carbon dioxide degrees of data gathered is carried out at abnormal data filtration, and general by S3, abnormal data filtering module 32
Dense carbon dioxide degrees of data after reason is sent to data weighting average value processing module 33.
S4, data weighting average value processing module 33 process dense carbon dioxide degrees of data, and by equal for gas concentration lwevel weighting
ValueIt is sent to gas concentration lwevel and solves module 35.
S5, temperature-compensating solve module 34 according to temperature data and gas concentration lwevel offset Δ P and temperature relation
Curve, it is thus achieved that gas concentration lwevel offset Δ P, and send result to gas concentration lwevel and solve module 35；Carbon dioxide
Concentration solves module 35 and calculates gas concentration lwevel weighted meanEquivalence two is obtained with gas concentration lwevel offset Δ P sum
Carbonoxide concentration P.
S6, control unit 4 according to equivalence gas concentration lwevel and optical sensor Data Control dioxide bottle 5 with
And alarm 6.In the present embodiment, gas concentration lwevel control unit is according to optical sensor Data Control dioxide bottle
The method of output flow is: if optical sensor data are less than setting value, then control closed electromagnetic valve dioxide bottle；If light
According to sensing data greater than or equal to setting value, then control dioxide bottle output flow according to gas concentration lwevel.At this
In technical scheme, under different illumination, photosynthesis of plant speed is the most different；When illumination abundance, it should provide more
Carbon dioxide promotes photosynthesis of plant；Otherwise, it should less carbon dioxide flow is provided.If gas concentration lwevel is higher than
Setting value, then alarm 6 is reported to the police.
The preferred embodiment of the present invention described in detail above.Should be appreciated that those of ordinary skill in the art without
Need creative work just can make many modifications and variations according to the design of the present invention.Therefore, all technology in the art
Personnel are available by logical analysis, reasoning, or a limited experiment the most on the basis of existing technology
Technical scheme, all should be in the protection domain being defined in the patent claims.
Claims (7)
1. a computer based booth gas concentration lwevel monitoring system, it is characterised in that including: gas concentration lwevel passes
Sensor, temperature sensor, numeric processing unit, optical sensor, gas concentration lwevel control unit；
Described temperature sensor connects the first input end of described numeric processing unit, described gas concentration lwevel sensor defeated
Going out end and connect the second input of described numeric processing unit, the outfan of described numeric processing unit connects described carbon dioxide
The first input end of concentration control unit；The second of described optical sensor outfan connection gas concentration lwevel control unit is defeated
Enter end；Described gas concentration lwevel control unit is according to optical sensor Data Control dioxide bottle output flow and enters
Row concentration overload alarm；
Described numeric processing unit includes:
Gas concentration lwevel compensates and temperature relation fitting module, for matching gas concentration lwevel and temperature curve；
Abnormal data filtering module, for Exception Filter data；
Numeric weights average value processing module, for averaging to sampled data filtering；
Temperature-compensating solves module, for described gas concentration lwevel sensor is carried out temperature-compensating；
Gas concentration lwevel solves module, is used for solving equivalence carbon dioxide concentration value.
2. a kind of computer based gas concentration lwevel monitoring system as claimed in claim 1, it is characterised in that: described different
Regular data filtering module extracts nearest n sampling carbon dioxide concentration value P successivelyiCarry out data filtering, willPoint
Filter；Described k >=1.3,1≤i≤n, n >=10.
3. a kind of computer based gas concentration lwevel monitoring system as claimed in claim 1, it is characterised in that: described number
Value weighted mean processing module seeks weighted mean according to the sampling carbon dioxide concentration value after Exception Filter data Wherein, n ' is the data volume after data filtering, 1≤j≤n '≤n, αjFor weight coefficient, αj=n '+1-j.
4. a kind of computer based gas concentration lwevel monitoring system as claimed in claim 1, it is characterised in that: described two
Carbonoxide concentration offsets and temperature relation fitting module are under debugging mode, control ambient carbon dioxide concentration and remain P0,
By gas concentration lwevel sensor respectively in temperature T1、T2、T3、T4、T5Test gas concentration lwevel, and record respectively at each temperature
Gas concentration lwevel offset Δ P1、ΔP2、ΔP3、ΔP4、ΔP5；Gas concentration lwevel offset Δ P described in matching and temperature
Degree relation curve, it is thus achieved that relation curve: Δ P=aT4+bT3+cT2+dT3+e；Described a, b, c, d, e are multinomial coefficient, described P0
≥0。
5. a kind of computer based gas concentration lwevel monitoring system as claimed in claim 1, it is characterised in that: described temperature
Degree compensation solves module, according to described gas concentration lwevel offset and temperature curve, it is thus achieved that described gas concentration lwevel
Offset Δ P.
6. a kind of computer based gas concentration lwevel monitoring system as claimed in claim 1, it is characterised in that: described two
Carbonoxide concentration solves module, for by described weighted meanWith described gas concentration lwevel offset Δ P summation acquisition etc.
Effect carbon dioxide concentration value P, described
7. a kind of computer based gas concentration lwevel monitoring system as claimed in claim 1, it is characterised in that described two
Carbonoxide concentration control unit according to the method for optical sensor Data Control dioxide bottle output flow is: if illumination passes
Sensor data are less than setting value, then control closed electromagnetic valve dioxide bottle；If optical sensor data are greater than or equal to setting
Definite value, then control dioxide bottle output flow according to gas concentration lwevel.
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Cited By (4)
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| CN108345185A (en) * | 2017-01-23 | 2018-07-31 | 株式会社平间理化研究所 | The concentration monitoring arrangement and developer solution managing device of developer solution |
| CN109060004A (en) * | 2018-06-04 | 2018-12-21 | 深圳市祥为测控技术有限公司 | A kind of humiture data acquisition system |
| CN112683837A (en) * | 2021-01-26 | 2021-04-20 | 杭州麦乐克科技股份有限公司 | Carbon dioxide concentration detection method based on infrared technology |
| CN114138038A (en) * | 2021-11-29 | 2022-03-04 | 广东鑫钻节能科技股份有限公司 | Air purification system based on air compression station |
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