CN109283110A - A kind of different-grain diameter air-anion concentration measurement method and device - Google Patents
A kind of different-grain diameter air-anion concentration measurement method and device Download PDFInfo
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- CN109283110A CN109283110A CN201811349238.XA CN201811349238A CN109283110A CN 109283110 A CN109283110 A CN 109283110A CN 201811349238 A CN201811349238 A CN 201811349238A CN 109283110 A CN109283110 A CN 109283110A
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- 238000000691 measurement method Methods 0.000 title description 2
- 238000005040 ion trap Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 11
- 238000004364 calculation method Methods 0.000 claims abstract description 3
- 239000011159 matrix material Substances 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 2
- 150000002500 ions Chemical class 0.000 abstract description 29
- 230000009471 action Effects 0.000 abstract description 5
- 230000037230 mobility Effects 0.000 description 30
- 150000001450 anions Chemical class 0.000 description 10
- 230000005684 electric field Effects 0.000 description 7
- 230000033001 locomotion Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
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- 230000036541 health Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 102000006391 Ion Pumps Human genes 0.000 description 1
- 108010083687 Ion Pumps Proteins 0.000 description 1
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- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
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Abstract
The invention discloses a kind of method and apparatus for measuring different-grain diameter air-anion concentration.The method of measurement different-grain diameter air-anion concentration includes the following steps: under the action of lift pump, air is with constant wind speed uniformly through two ion traps, the continuous voltage value for changing ion trap both ends, the voltage data and current data at real-time measurement ion trap both ends obtain the negative ion concentration of different-grain diameter in air using numerical calculations.The device for realizing this method includes power supply (1), lift pump (2), ion trap (3), adjustable resistance (4), current detecting system (5), voltage detecting system (6) and data processing computer (7).The present invention can accurately measure the negative ion concentration of different-grain diameter in air by combining current detecting with numerical value calculating.
Description
Technical field
The present invention relates to a kind of methods for measuring different-grain diameter air-anion concentration, including voltage, current detection step
Step is calculated with numerical value.
The invention further relates to a kind of device for measuring different-grain diameter air-anion concentration, including power supply, lift pump, ions
Collector, adjustable resistance, current detecting system, voltage detecting system and data processing computer.
Background technique
Negative aeroion is the general name of negatively charged single gas molecule and light ion group.Since negative aeroion can
Make the intracorporal free radical Non-toxic of biology and cell activation, has good facilitation to growth and development, therefore be considered as one
Meteor of the kind beneficial to human health.Air-anion concentration refers to the anion number in 1mL air, is to judge air matter
Measure the major criterion of quality.The World Health Organization provides that the concentration of anion in fresh air is 1000-1500/mL.According to
The size of ion partial size, negative aeroion are divided into small ion, intermediate ion and big ion.Life of the different anion of partial size in people
Generating in living has different role, and intermediate ion and big ion can partially settle the polluter in air, and small ion can
By lung breathing enter human body, growth and development and in terms of play positive effect.
Chinese utility model patent prospectus CN(205941427) U discloses a kind of monitoring dress of negative aeroion
It sets, mainly includes negative ion collector, signal amplifier and processor.This device connects ion collectors and signal amplifier
It connects, output signal is connected to processor, shown the concentration values of anion by the LCD MODULE on processor
On liquid crystal display.Chinese utility model patent prospectus CN(204613137) also disclose in U it is a kind of using microgalvanometer
Air-anion concentration detector, this detector is according to the threshold value set, using in threshold value return difference method switching microgalvanometer
The measuring range of electric current shows air-anion concentration eventually by control module.
Both measurement air-anion concentration devices principle as shown in Fig. 2, air under the action of lift pump (9) with
Constant wind speed is by condenser type ion trap (8), and ion trap collects the anion (10) in air, in collecting board two
End forms electric current, obtains air-anion concentration by current data and sampling air velocity calculating.If ion trap two
The voltage at end is U, can form electric current since the anion of different-grain diameter in air reaches collecting board, both devices are only
It is capable of measuring the total concentration value of negative aeroion, it is difficult to realize the precise measurement of different-grain diameter air-anion concentration.In addition, in phase
Under same environmental condition, if the voltage for collecting board ends is different, pass through the electric current of collecting board sky that is also not identical, therefore measuring
Gas negative ion concentration also can be different.That is, both devices are in measurement, there are biggish systematic errors.
Summary of the invention
The present invention be directed to the above-mentioned problems of the prior art to make improvement, i.e., the technical problem to be solved by the present invention is to
A kind of air-anion concentration that can measure different-grain diameter, and the lesser method of error are provided.
With this corresponding, another technical problems to be solved of the invention are to provide a kind of air that can measure different-grain diameter
Negative ion concentration, and the lesser device of error.
For measuring the method for different-grain diameter air-anion concentration, the present invention solves the method packet of above-mentioned technical problem
Include following steps: the continuous voltage for changing ion trap both ends, and the current data at real-time measurement ion trap both ends and
Voltage data.
On the basis of the negative aeroion mobility to different-grain diameter is analyzed, according to the resulting ioncollection of measurement
The voltage data at device both ends, the negative aeroion for calculating different-grain diameter reaches the percentage of ion trap top crown, into one
Step obtains calculating the coefficient matrix of different-grain diameter air-anion concentration.
It on the basis of coefficient matrix, according to resulting current data is repeatedly measured, combines, realizes with the operation of matrix
The precise measurement of the air-anion concentration of different-grain diameter.
For measuring the device of different-grain diameter air-anion concentration, the present invention is the device for solving the technical problem
Including power supply, lift pump, ion trap, adjustable resistance, current detecting system, voltage detecting system and data processing are calculated
Machine.Wherein adjustable resistance can continuously change the voltage at ion trap both ends, current detecting system and voltage detecting system energy
The current data and voltage data at enough real-time measurement ion trap both ends, data processing computer can acquire and store multiple groups
The current data and voltage data at ion trap both ends, and it is able to carry out matrix operation.
The utility model has the advantages that a kind of atmosphere negative ion concentration detection method provided by the invention and device, for measuring different grains
The air-anion concentration of diameter, error is smaller, has a good application prospect, for analysis air in different-grain diameter air bear from
The variation of sub- concentration provides research means.
Detailed description of the invention
Fig. 1 is that different-grain diameter air-anion concentration measuring device schematic diagram is measured in the present invention.
Fig. 2 is the structure principle chart of condenser type air-anion concentration detector.
Fig. 3 is that mobility is greater than motion profile of the negative aeroion of limit mobility in collector.
Fig. 4 is that mobility is less than motion profile of the negative aeroion of limit mobility in collector.
Specific embodiment
The specific embodiment of the invention is described in further detail with reference to the accompanying drawing.
The specific embodiment of the invention is using attached different-grain diameter air-anion concentration measuring device shown in FIG. 1.
Different-grain diameter air-anion concentration measuring device as shown in Figure 1, including power supply, adjustable resistance, lift pump, from
Sub- collector, current detecting system, voltage detecting system, data processing computer.
S1: under the action of lift pump, air is with constant wind speed uniformly through two ion traps；
S2: by an adjustable resistance, the continuous voltage for changing ion trap both ends；
S3: the current data and voltage data of current detecting system and voltage detecting system real-time measurement ion trap both ends；
S4: data processing computer acquires and stores the current data and voltage data at multiple groups ion trap both ends；
S5: carrying out mobility analysis based on the negative aeroion to different-grain diameter, and using storing in data processing computer
Multiple groups current data and voltage data obtain the negative ion concentration of different-grain diameter in air by matrix operation.
In the step S3 to the negative aeroion of different-grain diameter carry out mobility analysis the specific implementation process is as follows:
Air ion mobility is defined as the ratio of the speed that air ion moves in the electric field and electric field strength.Such as (1) formula institute
Show, in the case where the physical property of air is constant, ionic mobility is the monotropic function of ion partial size.It is centainly moved by measurement
The air-anion concentration of shifting rate can obtain the air-anion concentration of corresponding partial size.
(1)
Wherein e, r, l, η respectively indicate electrically charged, the ion partial size of ion, and air molecule mean free path and air are viscous
Coefficient, c1, c2, c3 are constant coefficient.Fig. 2 is the structure principle chart of condenser type air-anion concentration detector.Air bear from
It after son enters collector under the action of lift pump, on the one hand moves in the horizontal direction, speed is the sampling air stream of lift pump
Fast Vx, the effect on the one hand by electric field in collector is vertically moving, speed Vy.Assuming that the length of collector two-plate
Spending is L, spacing d, and the voltage between two-plate is U, the field strength E=U/d at any point in collector.Assuming that certain air is negative
The mobility of ion is k, according to the definition of mobility, under the action of vertical direction electric field, and speed of the ion along direction of an electric field
Vy=kE。
As shown in Fig. 2, resultant motion of the negative aeroion in collector is horizontally oriented the superposition with vertical direction movement,
Eventually arrive at the probe current formd after pole plate in circuit.If can just into the anion in collector measurement range
It is all collected, then should be moved to just from the ion that bottom crown edge enters collector when leaving measured zone
Pole plate is that is, equal with the time for leaving measured zone in the horizontal direction along the time that direction of an electric field reaches top crown:
(2)
In the situation known to the size and sampling air velocity of ion trap two-plate, if negative aeroion is by collecting
Device can all arrive at top crown, then it has to be larger than V along the speed of direction of an electric fieldy.According to the definition of mobility, in collector
In the electric field of formation, speed VyCorresponding mobility kbAre as follows:
(3)
kbFor limit mobility (limit mobility), be can all arrive at pole plate negative aeroion mobility it is minimum
Value.From above formula it is found that limit mobility is determined by the voltage between the size of ion trap, sampling air velocity and pole plate, with
Ion partial size is unrelated.
Fig. 3 is the negative aeroion motion profile that mobility is greater than limit mobility.Due to vertically moving speed
Degree is very fast, this part anion can all arrive at top crown and form electric current.Fig. 4 is the air that mobility is less than limit mobility
Anion motion profile.Since vertically moving speed is slower, only some can reach top crown and form electric current.It returns
The electric current detected in road is the sum of the electric current that the ion of different mobilities reaches that pole plate is formed.Traditional negative aeroion detection
Instrument thinks that all negative aeroions can reach pole plate in the design, that is to say, that probe current is only moved by mobility greater than the limit
The negative aeroion of shifting rate is formed, and leading to measurement result, there are certain systematic errors.
To obtain the air-anion concentration of different-grain diameter, first that negative aeroion is discrete by ion partial size is r1,r2,
r3…rNAnion, corresponding concentration is respectively n1,n2,n3…nN.Partial size is riNegative aeroion individually all arrive at pole
The electric current I that plate generatesi0Are as follows:
(4)
Wherein q is basic electric charge, VxFor the air velocity in lift pump, A is the area of collector pole plate.When by adjustable
Resistance successively applies different voltages U to ion trap both ends1,U2,U3…UNWhen, the electric current measured in circuit is respectively I1,I2,
I3…IN.It according to (3) formula, can calculate when collector both ends apply different voltages, corresponding negative aeroion limit migration
Rate k1b,k2b,k3b…kNb。
As shown in Figure 3 and Figure 4, after different mobility negative aeroions enter collector, the number of top crown is eventually arrived at
The percentage for accounting for total number is different.Assuming that ion trap both end voltage is UiWhen, partial size rjNegative aeroion enter collection
It is η that the number that top crown can be finally reached after device, which accounts for the percentage of total number,ij.If ionic mobility kjIt is migrated greater than the limit
Rate kjb, then top crown, η can be all arrived atij=1.If its ionic mobility kjLess than limit mobility kjb, only some
Top crown can be reached, the number that can finally reach top crown accounts for the percentage η of total numberijCalculation method it is as follows:
According to the definition of mobility, mobility kjNegative aeroion by both end voltage be UiIon trap when, from
The speed V that son is generated along vertical direction of an electric fieldyijAre as follows:
(5)
It is k in the mobility by collectorjAnion in, reach the percentage of the negative aeroion of top crown are as follows:
(6)
Wherein, UiFor the voltage at collector both ends, VxFor air velocity, L is the length of collector pole plate, and d is collector the two poles of the earth
Plate spacing.
In the step S5 matrix operation the specific implementation process is as follows:
Ion trap both ends apply voltage UiWhen, the electric current I that measures in circuitiTop crown is reached for the anion of different-grain diameter
When the electric current η that generatesi1I10, ηi2I20, ηi3I30… ηiNIN0The sum of:
(7)
(4) formula is substituted into:
(8)
Therefore, ion trap both ends apply the electric current measured when N number of voltage and are respectively as follows:
(9)
(10)
(11)
(12)
Write (9)-(12) formula as matrix form:
(13)
Wherein coefficient matrix H:
(14)
The electric current I measured in circuit:
(15)
The air-anion concentration Φ of different-grain diameter:
(16)
By the η being calculated in (6) formulaijCoefficient matrix (14) formula of substitution, finds out the inverse of coefficient matrix H using numerical method
Matrix H-1, according to detection electric current I, the negative ion concentration Φ of different-grain diameter in air is finally calculated:
(17)
By numerical method, existing data processing computer can solve N=1000 ~ 10000 ranks inverse matrix.According to relationship
Formula (14)-(17) measure electric current, realize the measurement of different-grain diameter air-anion concentration by continuously changing voltage.
Non-elaborated part of the present invention belongs to technology well known to those skilled in the art.
Although describing specific implementation method of the invention above, it will be appreciated by those of skill in the art that these
It is merely illustrative of, under the premise of without departing substantially from the principle of the invention and realization, numerous variations can be made to these embodiments
Or modification, therefore, protection scope of the present invention is defined by the appended claims.
Claims (4)
1. a kind of method for measuring different-grain diameter air-anion concentration, method includes the following steps:
The continuous voltage for changing ion trap both ends,
The current data and voltage data at real-time measurement ion trap both ends,
The air-anion concentration of different-grain diameter in air is obtained using numerical calculations,
It is characterized by: the numerical method is on the basis of the mobility of the negative aeroion to different-grain diameter is analyzed
It carries out.
2. according to the method for measuring different-grain diameter air-anion concentration described in claim 1, it is characterised in that: the numerical value side
Method is to combine realization with matrix operation based on resulting current value is repeatedly measured.
3. a kind of device for realizing measurement different-grain diameter air-anion concentration described in claim 1, including power supply (1),
Lift pump (2), ion trap (3), adjustable resistance (4), current detecting system (5), voltage detecting system (6) and data processing
Computer (7), it is characterised in that:
The adjustable resistance can continuously change the voltage at ion trap both ends；
The current detecting system and voltage detecting system are capable of the current data and voltage at real-time measurement ion trap both ends
Data；
The data processing computer is able to carry out matrix operation.
4. device described in accordance with the claim 3, it is characterised in that: the data processing computer can acquire and store multiple groups
The current data and voltage data at ion trap both ends.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112113787A (en) * | 2020-09-24 | 2020-12-22 | 北京小米移动软件有限公司 | Detection method and device, test equipment and storage medium |
| CN113567504A (en) * | 2021-07-20 | 2021-10-29 | 北京清博益康科技有限公司 | Negative ion collector, negative ion concentration detection device, detection method and detector |
| CN114577692A (en) * | 2022-04-21 | 2022-06-03 | 亿慧云智能科技（深圳）股份有限公司 | Intelligent negative ion concentration detection device and detection method |
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