CN107421859A - Two-way particle concentration detection means and its detection method - Google Patents
Two-way particle concentration detection means and its detection method Download PDFInfo
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- CN107421859A CN107421859A CN201710663989.8A CN201710663989A CN107421859A CN 107421859 A CN107421859 A CN 107421859A CN 201710663989 A CN201710663989 A CN 201710663989A CN 107421859 A CN107421859 A CN 107421859A
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- 239000002245 particle Substances 0.000 title claims abstract description 41
- 238000001514 detection method Methods 0.000 title claims abstract description 22
- 239000003570 air Substances 0.000 claims abstract description 88
- 230000003287 optical effect Effects 0.000 claims abstract description 64
- 238000012545 processing Methods 0.000 claims abstract description 39
- 238000004140 cleaning Methods 0.000 claims abstract description 38
- 239000013618 particulate matter Substances 0.000 claims abstract description 24
- 239000012080 ambient air Substances 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims description 2
- 238000011017 operating method Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 210000002345 respiratory system Anatomy 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 210000000621 bronchi Anatomy 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect 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
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Abstract
It is a kind of to be used for air cleaning unit and the two-way particle concentration detection means of measurement accuracy be effectively improved, the second optical particulate thing concentration sensor and signal processing unit including the first optical particulate thing concentration sensor for detecting air cleaning unit placement region ambient air particulate matter concentration, before air outlet after the screen pack in air cleaning unit work air channel, it is connected with each other and realizes signal communication.The ambient air particulate matter concentration detection method of the detection means includes following calibration steps：Start the first and second optical particulate thing concentration sensors simultaneously to work on power a period of time, but blower fan does not work during this, and its first group of first electric signal exported and first group of second electric signal are received and recorded by signal processing unit；Then, blower fan normal work is started；After a period of time, signal processing unit receives and records second group of second electric signal of now the second optical particulate thing concentration sensor output.
Description
Technical field
The present invention relates to sensor technical field, the ambient air particulate matter in more particularly to a kind of air cleaning unit is dense
Spend detection means and detection method.
Technical background
In recent years, particulate matter（Particulate Matter）Received much concern as one of pollutant important in air.
Particulate matter is very harmful to the mankind, especially small size particle, can fly at for a long time in air, it is difficult to ground is deposited to,
Easily enter human respiratory tract, and particle diameter is smaller, and the sedimentation location in human respiratory tract is deeper, and harm is bigger.New edition《Environment
Air quality standard》The particulate matter of aerodynamics equivalent diameter≤10 μm in surrounding air is referred to as pellet
PM10, the particulate matter of aerodynamics equivalent diameter≤2.5 μm in surrounding air is referred to as fine particle PM2.5.PM10 is easily heavy
Accumulate in the upper respiratory tract, trigger various diseases；PM2.5 can be deposited on bronchus and lung, and be more easy to adsorb toxic thing
Matter enters in vivo, is detrimental to health.Therefore, increasingly important is seemed to the accurate measurement of particle concentration in surrounding air.Base
At home and abroad largely used at present in the particle concentration sensor of optical principle, because its miniaturization, data export in real time
The features such as low with cost, it is widely used in the civil equipments such as air cleaning unit, such as Household air purifier, automobile-used sky
Air purifying apparatus, the air-conditioning with air-cleaning function etc..
The Optical Transmit Unit of optical particulate thing concentration sensor, light receiving unit, light path design, signal acquisition method and
The mathematical modeling for being converted to particle concentration output is had nothing in common with each other, for example, Optical Transmit Unit mainly has infrared light and laser.Optics
The output algorithm and calibration method of particle concentration sensor are also different, for example, system is normalized using first order modeling
Calculating method, multipoint method normalization high order compensation statistic algorithm etc..In addition, the range of particle concentration sensor is different, example
Such as, the output area of particulate matter quality concentration is to 600 μ g/（Every cubic metre of microgram）, 1,000 μ g/ etc..On the other hand, light
Optical Transmit Unit after the particle concentration sensor long-term use of principle（Light source）Light intensity attenuation, sensor internal dust stratification etc.
The characteristic changing of light path characteristic variations and sensor miscellaneous part caused by factor, include the temperature of sensor running environment
The factors such as humidity change, change the output characteristics for causing sensor, thus cause sensor output to produce larger
Error, in other words measurement data drift are serious.
According to《Ambient air quality》、《Ambient air quality index technique provides》And《Air purifier country mark
It is accurate》Deng requiring, air cleaning unit typically according to the output valve of particle concentration sensor, set 35 μ g/, 75 μ g/,
The particulate matter quality concentration thresholds such as 115 μ g/, 150 μ g/, 250 μ g/ carry out the rotating speed or work(of control device inner blower operation
Rate carries out corresponding air adjustment, may also choose or adjust some threshold values therein and carry out using design.In fact, environment is empty
Makings volume index be deteriorated urban environment air, be more tens every cubic metre of micrograms slight pollution or to 150 μ g/ with
Under intermediate pollution.It can thus be seen that the particle concentration sensor application in air cleaning unit, more concerned its
The accuracy of measurement of low concentration output area.
The content of the invention
The present invention provides two-way particulate matter a kind of simple in construction but can effectively improving low concentration output area measurement accuracy
Concentration detection apparatus and its ambient air particulate matter concentration detection method, it is primarily but not limited to be used for air cleaning unit.
The two-way particle concentration detection means includes the first optical particulate thing concentration sensor, the second optical particulate thing
Concentration sensor and signal processing unit, it is connected with each other and realizes signal communication.
The first optical particulate thing concentration sensor is used for the environment air grain for detecting air cleaning unit placement region
Grain thing concentration.The sensor is located at inoperative air channel region in air cleaning unit or worked wind positioned at air cleaning unit
After air inlet in road before screen pack, it exports the first electric signal OUT1 after working on power.The second optical particulate thing
Concentration sensor is used for the output for calibrating the first optical particulate thing concentration sensor, and it is located at air cleaning unit work wind
Region after screen pack in road before air outlet, it exports the second electric signal OUT2 after working on power.
First electric signal OUT1 of the first optical particulate thing concentration sensor measuring environment air output is corresponding to its to be measured
Particle concentration value correspond to first function relation FUNC1, the output of the second optical particulate thing concentration sensor measuring environment air
The second electric signal OUT2 particle concentration value corresponding second function relation FUNC2s for measuring corresponding to its.The first described He
Second function relation FUNC1 and FUNC2 can be that the first and second optical particulate thing concentration sensors measure actual environment respectively
The value of air demarcation or theoretic calculated value, or the combination of both.Second optical particulate thing concentration senses
Device exports initial electrical signal OC0 when measuring particle concentration and being null value.Initial electrical signal OC0 can be the second optical particulate
The value or the second optical particulate thing that thing concentration sensor actual measuring environment air particle concentration is demarcated when being null value
Concentration sensor measures the theoretical value calculated after demarcation in other surrounding airs.
The signal processing unit receives or storage first function relation FUNC1, second function relation FUNC2, initial electricity
Signal OC0 and the first and second described electric signal OUT1 and OUT2, and export after related operation the environment of calibration
Air particle concentration measurement C.The signal processing unit can be inside the first or second optical particulate thing concentration sensor
Signal processing unit MCU（Single-chip microcomputer）, or the signal processing unit MCU on air cleaning unit master control borad, either
The signal processing unit being additionally present of, or two or more signal processing units collaboration composition among these.
The ambient air particulate matter concentration detection method that described two-way particle concentration detection means is realized includes following
Calibration steps：
Air cleaning unit starts the first and second optical particulate thing concentration sensors and worked on power a period of time simultaneously, but herein
Period inner blower is not worked, i.e. the first and second optical particulate thing concentration sensors are relative to be in same surrounding air, and its is defeated
The first group of first electric signal OUT1-1 and first group of second electric signal OUT2-1 gone out is received and recorded by signal processing unit.
Then, air cleaning unit starts blower fan normal work.After a period of time, signal processing unit receives and records this
When the second optical particulate thing concentration sensor output second group of second electric signal OUT2-2.Afterwards, the second optical particulate thing is dense
Degree sensor can turn off.
The work that the signal processing unit is comprised the following steps：
The difference for calculating second group of second electric signal OUT2-2 and initial electrical signal OC0 is the second offset OS2.By the second skew
Amount OS2 cuts the second electric signal OUT2-C for calculating calibration from first group of second electric signal OUT2-1, and passes through the second letter
Number relation FUNC2 calculates the common measured value C0 of particle concentration of its respective alignment.The particle concentration of calibration is surveyed jointly
Value C0 calculates the first electric signal OUT1-C of its respective alignment by first function relation FUNC1, and calculates first group the
One electric signal OUT1-1 and the first electric signal OUT1-C of the calibration difference are the first offset OS1.By the first offset OS1
The output electric signal for calibration is cut in the first electric signal OUT1 exported from the first follow-up optical particulate thing concentration sensor
OUTC, and ambient air particulate matter concentration measurement C of the output for respective alignment is calculated by first function relation FUNC1.
Described in each electrifying startup above operating procedure is repeated during air cleaning unit.Or setting air purifier
When the power-off shutdown time meets certain threshold condition, above operating procedure is carried out after its electrifying startup.Or purification of air
Device normal work for a period of time after and when meeting certain threshold condition, then turn off more than fan operation carries out afterwards for a period of time
Operating procedure.
After electrifying startup air cleaning unit, the second optical particulate thing concentration sensor is null value in particle concentration
Shi Jinhang is calibrated, and carries out transmission calibration to the first optical particulate thing concentration sensor so that signal processing unit exports school
Accurate ambient air particulate matter concentration measurement C is consistently remained close in the initial output of the first optical particulate thing concentration sensor
Characteristic, effectively improve the problem of optical particulate thing concentration sensor measurement data is drifted about.
Brief description of the drawings
Fig. 1 show the two-way particle concentration structure of the detecting device schematic diagram for air cleaning unit of the present invention.
Fig. 2 show the signal processing unit workflow diagram of the present invention.
Embodiment
Refer to shown in Fig. 1, for the two-way particle concentration structure of the detecting device schematic diagram of the present invention.Air cleaning unit
100 inside include air inlet, screen pack, air outlet, blower fan and master control borad, the work air channel 110 formed after its normal work
Produce distinguished and admirable from air inlet to air outlet direction.Two-way particle concentration detection means passes including the first optical particulate thing concentration
Sensor S1, the second optical particulate thing concentration sensor S2 and signal processing unit SPU, it is connected with each other and realizes signal communication.
First electric signal OUT1 of the first optical particulate thing concentration sensor S1 measuring environments air output is corresponding to its to be surveyed
The particle concentration value obtained corresponds to first function relation FUNC1, the second optical particulate thing concentration sensor S2 measuring environment air
The second electric signal OUT2 particle concentration value corresponding second function relation FUNC2s for measuring corresponding to its of output.FUNC1 and
FUNC2 can be that S1 and S2 measure the value of actual environment air demarcation or theoretic calculated value, or this respectively
Combination.Second optical particulate thing concentration sensor S2 exports initial electrical signal when measuring particle concentration and being null value
OC0.OC0 can be the value or S2 demarcated when the actual measuring environment air particle concentration of S2 is null value in other rings
The theoretical value calculated in the air of border after measurement demarcation.
The first optical particulate thing concentration sensor is used for the environment air grain for detecting air cleaning unit placement region
Grain thing concentration.
In one of the embodiments, the first optical particulate thing concentration sensor S1 is located at the non-of air cleaning unit 100
Work air channel region 101.
In one of the embodiments, the first optical particulate thing concentration sensor S1 is located at air cleaning unit 100 and worked
Region 102 after air inlet in air channel 110 before screen pack.
Second optical particulate thing concentration sensor S2 is used to calibrate the defeated of the first optical particulate thing concentration sensor S1
Go out, it is located at the region 103 before air outlet after the screen pack that air cleaning unit 100 works in air channel 110.
The signal processing unit SPU is received or storage first function relation FUNC1, second function relation FUNC2, initial
The the first electric signal OUT1 and the second electric signal OUT2 that electric signal OC0 and S1 and S2 is exported after working on power, and carry out phase
The ambient air particulate matter concentration measurement C of calibration is exported after the computing of pass.
In one of the embodiments, signal processing unit SPU is inside the first optical particulate thing concentration sensor S1
Signal processing unit MCU（Single-chip microcomputer）.
In one of the embodiments, signal processing unit SPU is inside the second optical particulate thing concentration sensor S2
Signal processing unit MCU.
In one of the embodiments, signal processing unit SPU is the signal transacting on the master control borad of air cleaning unit 100
Unit MCU.
In one of the embodiments, signal processing unit SPU is the signal processing unit being additionally present of.
In one of the embodiments, signal processing unit SPU is inside the first optical particulate thing concentration sensor S1
Signal processing unit MCU, air cleaning unit inside signal processing unit MCU, the second optical particulate thing concentration sensor S2
Signal processing unit MCU on 100 master control borads and two or more letters in the signal processing unit being additionally present of
Number processing unit collaboration composition.
The ambient air particulate matter concentration detection method that described two-way particle concentration detection means is realized includes following
Calibration steps：
(1) air cleaning unit 100 starts the first optical particulate thing concentration sensor S1 and the second optical particulate thing concentration simultaneously
Sensor S2 works on power a period of time, but inner blower does not work during this period, i.e. S1 and S2 are in same surrounding air relatively
In, its first group of first electric signal OUT1-1 exported and first group of second electric signal OUT2-1 are connect by signal processing unit SPU
Receive and record.
(2) air cleaning unit 100 starts blower fan normal work.After a period of time, signal processing unit SPU is received and remembered
Second group of second electric signal OUT2-2 of record now S2 outputs.
(3) in one of the embodiments, the second optical particulate thing concentration sensor S2 hereafter is turned off.
(4) refer to shown in Fig. 2, for the signal processing unit SPU workflow diagrams of the present invention.
The work that the signal processing unit SPU is comprised the following steps：
The difference for calculating second group of second electric signal OUT2-2 and initial electrical signal OC0 is the second offset OS2.By the second skew
Amount OS2 cuts the second electric signal OUT2-C for calculating calibration from first group of second electric signal OUT2-1, and passes through the second letter
Number relation FUNC2 calculates the common measured value C-C of particle concentration of its respective alignment.The particle concentration of calibration is surveyed jointly
Value C-C calculates the first electric signal OUT1-C of its respective alignment by first function relation FUNC1, and calculates first group the
One electric signal OUT1-1 and the first electric signal OUT1-C of the calibration difference are the first offset OS1.By the first offset OS1
The output telecommunications for calibration is cut in the first electric signal OUT1 exported from the first follow-up optical particulate thing concentration sensor S1
Number OUTC, and ambient air particulate matter concentration measurement C of the output for respective alignment is calculated by first function relation FUNC1.
In one of the embodiments, above operating procedure is carried out during each electrifying startup air cleaning unit 100.
In one of the embodiments, the power-off shutdown time of setting air purifier 100 meets certain threshold condition
When, above operating procedure is carried out after its electrifying startup.
In one of the embodiments, the normal work of air cleaning unit 100 is rear for a period of time and meets certain threshold value
During condition, then turn off fan operation and carry out above operating procedure afterwards for a period of time.
Embodiment described above only expresses the several embodiments of the present invention, but the present invention is not necessarily limited by this.Should
, it is noted that for any those skilled in the art, without departing from the inventive concept of the premise, if can also make
Dry modification and improvement, these belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be with appended right
Claim limits.
Claims (4)
1. a kind of two-way particle concentration detection means for air cleaning unit, it is characterised in that including the first optics
Grain thing concentration sensor, the second optical particulate thing concentration sensor and signal processing unit, it is connected with each other and realizes that signal leads to
News,
The first optical particulate thing concentration sensor is used for the ambient air particulate matter for detecting air cleaning unit placement region
Concentration,
The second optical particulate thing concentration sensor is used for the output for calibrating the first optical particulate thing concentration sensor, its
Region before air outlet after the screen pack in air cleaning unit work air channel.
2. two-way particle concentration detection means according to claim 1, it is characterised in that
The first electric signal measured corresponding to its of the first optical particulate thing concentration sensor measuring environment air output
Grain thing concentration value correspond to first function relation, the second optical particulate thing concentration sensor measuring environment air export second
Electric signal corresponding second function relation of particle concentration value measured corresponding to its,
The second optical particulate thing concentration sensor exports initial electrical signal when measuring particle concentration and being null value,
The signal processing unit receives or storage is described the first and second functional relations, the initial electrical signal and described
The output of the first and second optical particulate thing concentration sensor measuring environment air the first and second electric signals, and carry out phase
The ambient air particulate matter concentration measurement of calibration is exported after the computing of pass.
3. a kind of ambient air particulate matter concentration detection method for air cleaning unit, its realization device includes：First light
Particle concentration sensor, the second optical particulate thing concentration sensor and signal processing unit are learned, it is connected with each other and realizes letter
Number communication,
The first optical particulate thing concentration sensor is used for the ambient air particulate matter for detecting air cleaning unit placement region
Concentration,
The second optical particulate thing concentration sensor is used for the output for calibrating the first optical particulate thing concentration sensor, its
Region before air outlet after the screen pack in air cleaning unit work air channel；
Described ambient air particulate matter concentration detection method includes following calibration steps：
Air cleaning unit starts the first and second described optical particulate thing concentration sensors and worked on power a period of time simultaneously,
But inner blower does not work during this period, first group of first electricity of the first and second described optical particulate thing concentration sensors output
Signal and first group of second electric signal are received and recorded by the signal processing unit,
Then, air cleaning unit starts blower fan normal work, and after a period of time, the signal processing unit receives and records this
Second group of second electric signal of Shi Suoshu the second optical particulate things concentration sensor output.
4. ambient air particulate matter concentration detection method according to claim 3, it is characterised in that the signal transacting list
The job step of member includes：
It is the second offset to calculate second group of second electric signal and the difference of the initial electrical signal,
Second offset is cut to the second electric signal for calculating calibration from first group of second electric signal,
The particle concentration that second electric signal of the calibration calculates its respective alignment by the second function relation is total to
Same measured value,
The common measured value of the particle concentration of the calibration is calculated to the of its respective alignment by the first function relation
One electric signal,
The difference for calculating first group of first electric signal and the first electric signal of the calibration is the first offset,
That first offset is exported from follow-up the first optical particulate thing concentration sensor measuring environment air
The output electric signal for calibration is cut in one electric signal,
The output electric signal of the calibration is empty for the environment of the corresponding calibration by first function relation calculating output
Aerated particle thing concentration measurement.
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