CN108120659A - A kind of particle concentration detecting system and method having from zero calibration - Google Patents
A kind of particle concentration detecting system and method having from zero calibration Download PDFInfo
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- CN108120659A CN108120659A CN201711252146.5A CN201711252146A CN108120659A CN 108120659 A CN108120659 A CN 108120659A CN 201711252146 A CN201711252146 A CN 201711252146A CN 108120659 A CN108120659 A CN 108120659A
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- 239000002245 particle Substances 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title description 10
- 238000012545 processing Methods 0.000 claims abstract description 51
- 230000003287 optical effect Effects 0.000 claims abstract description 33
- 238000005259 measurement Methods 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 238000004140 cleaning Methods 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 239000003570 air Substances 0.000 description 90
- 238000004378 air conditioning Methods 0.000 description 4
- 238000000149 argon plasma sintering Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 210000002345 respiratory system Anatomy 0.000 description 3
- 238000004887 air purification Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 210000000621 bronchi Anatomy 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 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
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012372 quality testing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
- G01N21/532—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke with measurement of scattering and transmission
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
A kind of particle concentration detecting system and detection method having from zero calibration, the detecting system include：Signal processing unit, optical sensor and surrounding air purifier, wherein, the electric signal that optical sensor sensing enters the air sample of its particles detecting regions and output detects, signal processing unit determines the particle concentration detected according to the electric signal, there is flow-guiding channel between surrounding air purifier and optical sensor so that surrounding air can flow through particles detecting regions when surrounding air purifier does not work, to particles detecting regions introducing by its purified pure air when surrounding air purifier works unobstructedly.The detection method includes：The startups surrounding air purifier of signal processing unit interruption work and records the obtained pure air measured value of measurement, and the difference of the pure air measured value detected by comparing and predetermined pure air calibration value is drifted about and the drift degree of measurement data to judge that measurement data whether there is.
Description
Technical field
The system of detection the present invention relates to airborne particles more particularly to a kind of detection of optical principle particle concentration and
Method belongs to air quality monitoring technical field.
Technical background
In recent years, airborne particles（airborneparticle）Pass is received as one of pollutant important in air
Note.Airborne particles are very harmful to the mankind, especially small particle particle, can fly at for a long time in air, it is difficult to settle
To ground, easily into human respiratory tract, and grain size is smaller, and the sedimentation location in human respiratory tract is deeper, and harm is bigger.
《Ambient air quality》The airborne particles of aerodynamics equivalent diameter≤10 μm in surrounding air are known as to inhale
Enter particulate matter PM10, the particle of aerodynamics equivalent diameter≤2.5 μm in surrounding air is known as fine particle PM2.5.
PM10 is easily deposited on the upper respiratory tract, triggers various diseases；PM2.5 can be deposited on bronchus and lung, and be more easy to be adsorbed with
The substance of murder by poisoning is detrimental to health into vivo.Therefore, it is aobvious to the accurate measurement of air borne particle concentration in surrounding air
It obtains increasingly important.Particle detecting method based on optical principle is at home and abroad largely used at present, since optical particle detects
System（For example, optical particle sensors）, have the characteristics that miniaturization, in real time sensing and it is at low cost, be widely used in air
The equipment such as clarifier, fresh air system, air-conditioning, air quality detecting device.
Light source unit, light receiving unit, light path design, signal processing and the particle sensing of optical particle detecting system are calculated
Method（particle sensing algorithm）Etc. design have nothing in common with each other, for example, light emitting unit mainly have it is infrared
Light and laser, particle concentration sensing principle include light scattering photometer method（light scattering photometers
method）With light diffusing particles counting method（light scattering particle counter method）, have or
Without the fan for introducing controlled airflow.The system performance of the optical particle detecting system of different designs is had nothing in common with each other, including inspection
The grain size sensitivity of examining system（Particle size sensitivity, you can the grain size and difference of the smallest particles of measurement
The particle measurement accuracy of grain size）, resolution ratio, range, measurement accuracy, the response time, measurement reproducibility and long-time stability
（measurement repeatability and long-term stability）, curve of output drift characteristic（output
curvedriftcharacteristics）, service life and product cost etc. product characteristic respectively have advantage and disadvantage.
On the other hand, the light intensity attenuation of light source unit after the long-time service of optical particle detecting system, internal system dust stratification and
The light path characteristic variations that light channel structure part deforms etc. caused by factors, the characteristic changing of system other component（For example, fan
Variation controlled airflow is caused to change）And the factors such as humiture variation of system running environment, it will cause detection system
The output characteristics of system changes, and the measurement output of optical particle detecting system is thus caused to generate larger error, in other words
Measurement data drift is serious.
The content of the invention
It is clean the present invention provides small-sized surrounding air purifier is used to introduce optical sensor in essential characteristic
As detection sample to carry out particle concentration detection method and system from zero calibration, output characteristics drifting problem obtains air
To be effectively improved, and improve the measurement accuracy of optical particle concentration detection method and system.This method and system allow as a result,
Optical particle sensors module, air purification will be merged into the airborne particles Concentration Testing calibrated in real time from zero
In the equipment such as device, fresh air system, air-conditioning, portable air quality detection device.
In one aspect of the invention, there is the particle concentration detecting system from zero calibration to include：Signal processing unit,
The optical sensor and the surrounding air by signal processing unit control work being communicatively coupled with the signal processing unit
Purifier, wherein, the telecommunications that the optical sensor sensing enters the air sample of its particles detecting regions and output detects
Number, there is flow-guiding channel between the surrounding air purifier and the optical sensor so that surrounding air purification dress
The particles detecting regions can be flowed through unobstructedly by putting surrounding air when not working, during the surrounding air purifier work to
The particles detecting regions are introduced by its purified pure air.
The signal processing unit is filtered amplification, sampling and number to the electric signal received from optical sensor
After change processing, the aptitude directly related with sensed KPT Scatter luminous intensity is formed（aptitude；For example, voltage amplitude
Or ADC sampled values）Then value records, analyzes and calculates the calibration value of the aptitude value information and reference storage to determine
The particle concentration detected.The calibration value is dense for the predetermined aptitude value and particle stored in signal processing unit
The correspondence of angle value.
In some embodiments, the surrounding air purifier by the signal processing unit control work fan and
With the air passage one side of the fan（Air inlet or air outlet）The high efficiency particle air filter of closed combination（For example, reach HEPA
The filter screen of standard）It forms.
In some embodiments, the air passage both sides of the fan（Air inlet and air outlet）It is respectively provided with the efficient of closed combination
Air filter.
In some embodiments, the surrounding air purifier controls the electrostatic of work to remove for the signal processing unit
Dirt device.
In some embodiments, which further includes：The output interface being communicatively coupled with the signal processing unit,
In, the signal processing unit sends the particle concentration information detected to the output interface.
In another aspect of the present invention, there is the particle concentration detection method from zero calibration to comprise the following steps：Institute
The startup surrounding air purifier for stating signal processing unit interruption works and records the pure air measured value detected,
The pure air measured value that the signal processing unit detects by comparing and predetermined pure air calibration value
Difference come judge the measurement data of the particle concentration detecting system with the presence or absence of drift and measurement data drift degree.
In some embodiments, the pure air measured value is that the pure air detected surveys aptitude value, institute
Signal processing unit is stated with pure air actual measurement aptitude value ability corresponding with pure air in the calibration value to incline
The correspondence of predetermined aptitude value and particle concentration value carries out in calibration value described in function pair to the difference of value
Data calibration.
In some embodiments, the pure air measured value is that the pure air detected surveys aptitude value, institute
Signal processing unit is stated with pure air actual measurement aptitude value ability corresponding with pure air in the calibration value to incline
The particle concentration detected to the function pair of the difference of value carries out data calibration.
In some embodiments, the pure air measured value is the pure air particle concentration measured value detected, institute
Signal processing unit is stated with predetermined ability in calibration value described in the function pair of the pure air particle concentration measured value
The correspondence of propensity value and particle concentration value carries out data calibration.
In some embodiments, the pure air measured value is the pure air particle concentration measured value detected, institute
It states the particle concentration that signal processing unit is detected with the function pair of the pure air particle concentration measured value and carries out data school
It is accurate.
By reference to combining the detailed description of attached drawing briefly described below, aforementioned aspect of the present invention is better understood with
With other aspects, the present invention is defined by the appended claims.
Description of the drawings
Task of explanation is only used for attached drawing described here, and is not intended in any way limit model disclosed by the invention
It encloses.In addition, shape, proportional sizes and mutual structure composition of each component in figure etc. is exemplary only, it is used to help
The understanding of the present invention is not specific shape, proportional sizes and the mutual structure composition for limiting each component of the present invention.This
The technical staff in field under the teachings of the present invention, can select as the case may be various possible shapes, proportional sizes and
Mutual structure composition implements the present invention.
Fig. 1 shows a kind of example arrangement signal with the particle concentration detecting system from zero calibration of the present invention
Figure.
Fig. 2 shows that in some embodiments of the invention optical sensor is structural with surrounding air purifier
Schematic diagram.
Specific embodiment
Figures 1 and 2 show that the particle concentration detection system having from zero calibration in some embodiments of the invention
System.For example, can be to fill applied to air purifier, fresh air system, air-conditioning, portable air quality testing by the system integration
Optical particle sensors module in putting.The system includes：Optical sensor 110, internal light detector 117 sense internal light source
111 transmitting through the first lens 112 collimation detection lights 113 be projected to particle sensing area 114 after produced by KPT Scatter
The light that is converged by the second lens 116 of scattering light 115 and convert the corresponding electric signal of output；It is communicatively coupled to light biography
Signal processing unit 120 between sensor 110 and output interface 140；And work is controlled by signal processing unit 120
Surrounding air purifier 130.Wherein, the sensing of optical sensor 110 enters the air sample of its particles detecting regions 114, environment
There is flow-guiding channel 150 between air cleaning unit 130 and optical sensor 110 so that the not work of surrounding air purifier 130
Surrounding air can flow through particles detecting regions 114 unobstructedly when making, to detection of particles when surrounding air purifier 130 works
Region 114 introduces surrounding air 160 through 130 purified pure air 170 of surrounding air purifier.Signal processing unit
120 pairs after the electric signal that optical sensor 110 receives is filtered amplification, sampling and digitized processing, formed and quilt
The directly related aptitude value of KPT Scatter luminous intensity is sensed, then records, analyze and calculate the aptitude value information simultaneously
The particle concentration detected is determined with reference to the calibration value of storage.The calibration value is pre- to be stored in signal processing unit 120
The first correspondence of definite aptitude value and particle concentration value.In some embodiments, surrounding air purifier 130 by
Signal processing unit 120 controls the fan 131 of work and the high efficiency particle air filter with the closed combination in air passage one side of fan 131
132（For example, the filter screen of HEPA standards）It forms.In some embodiments, the air passage both sides of fan 131（Air inlet and outlet air
Mouthful）It is respectively provided with the high efficiency particle air filter 132 of closed combination.In some embodiments, surrounding air purifier 130 is signal
Processing unit 120 controls the electrostatic precipitator of work（Do not show in figure）.
Next, comprise the following steps with the particle concentration detection method from zero calibration：Between signal processing unit 120
Disconnected startup surrounding air purifier 130 works and records the pure air measured value detected, and signal processing unit 120 is logical
It crosses and compares the difference of the pure air measured value and predetermined pure air calibration value detected to judge the grain
The measurement data of sub- concentration detection system is with the presence or absence of drift and the drift degree of measurement data.
In some embodiments, the pure air measured value is the pure air actual measurement aptitude value detected, is believed
Number processing unit 120 is with pure air actual measurement aptitude value aptitude corresponding with pure air in the calibration value
The correspondence of predetermined aptitude value and particle concentration value is into line number in calibration value described in the function pair of the difference of value
According to calibration.
In some embodiments, the pure air measured value is the pure air actual measurement aptitude value detected, is believed
Number processing unit 120 is with pure air actual measurement aptitude value aptitude corresponding with pure air in the calibration value
The particle concentration that the function pair of the difference of value detects carries out data calibration.
In some embodiments, the pure air measured value is the pure air particle concentration measured value detected, letter
Number processing unit 120 is inclined with predetermined ability in calibration value described in the function pair of the pure air particle concentration measured value
Data calibration is carried out to the correspondence of value and particle concentration value.
In some embodiments, the pure air measured value is the pure air particle concentration measured value detected, letter
The particle concentration that number processing unit 120 is detected with the function pair of the pure air particle concentration measured value carries out data school
It is accurate.
The system building blocks can be distributed in optical particle sensors, air quality detecting device and its applied
One or more of the equipment such as air purifier, fresh air system or air-conditioning device.
Can using can perform on the microprocessor software, custom circuit or a combination thereof perform by signal processing list
The function described herein that member 120 performs.
It will be appreciated by those of ordinary skill in the art that in the case of without departing substantially from the spirit and essential characteristics of the present invention, it can
By by other it is specific in the form of implement the present invention.Therefore, this description is considered as schematical rather than limit in all fields
Property processed.The scope of the present invention indicates by appended claims, and be intended in the meaning and scope by its equivalent institute with
All changes be included therein.
Claims (9)
1. a kind of particle concentration detecting system having from zero calibration, which is characterized in that the detecting system includes：At signal
Manage unit, the optical sensor being communicatively coupled with the signal processing unit and the environment by signal processing unit control work
Air cleaning unit, wherein,
The electric signal that the optical sensor sensing enters the air sample of its particles detecting regions and output detects,
There is flow-guiding channel between the surrounding air purifier and the optical sensor so that the surrounding air purifies
Surrounding air can flow through the particles detecting regions unobstructedly when device does not work,
It is introduced during the surrounding air purifier work to the particles detecting regions by its purified pure air,
The signal processing unit is filtered amplification, sampling and number to the electric signal received from the optical sensor
The aptitude value directly related with sensed KPT Scatter luminous intensity is formed after change processing, then recording, analyze and calculate should
Aptitude value information simultaneously refers to the calibration value of storage to determine the particle concentration detected, and the calibration value is at the signal
The correspondence of the predetermined aptitude value and particle concentration value that are stored in reason unit.
2. the particle concentration detecting system according to claim 1 having from zero calibration, which is characterized in that the environment
Air cleaning unit by the signal processing unit control work fan and with the closed combination in air passage one side of the fan
High efficiency particle air filter is formed.
3. the particle concentration detecting system according to claim 1 having from zero calibration, which is characterized in that the environment
Air cleaning unit by signal processing unit control work fan and with the respective closed knot in the air passage both sides of the fan
The high efficiency particle air filter of conjunction is formed.
4. the particle concentration detecting system having from zero calibration according to Claims 2 or 3, which is characterized in that described
High efficiency particle air filter is the filter screen for reaching HEPA standards.
5. a kind of particle concentration detection method having from zero calibration, realization device include：Signal processing unit, with it is described
The optical sensor and the surrounding air purifier by signal processing unit control work that signal processing unit is communicatively coupled,
Wherein,
The electric signal that the optical sensor sensing enters the air sample of its particles detecting regions and output detects, the environment
There is flow-guiding channel so that when the surrounding air purifier does not work between air cleaning unit and the optical sensor
Surrounding air can flow through the particles detecting regions unobstructedly, be examined when the surrounding air purifier works to the particle
Region is surveyed to introduce by its purified pure air,
The signal processing unit is filtered amplification, sampling and number to the electric signal received from the optical sensor
The aptitude value directly related with sensed KPT Scatter luminous intensity is formed after change processing, then recording, analyze and calculate should
Aptitude value information simultaneously refers to the calibration value of storage to determine the particle concentration detected, and the calibration value is at the signal
The correspondence of the predetermined aptitude value and particle concentration value that are stored in reason unit；
The particle concentration detection method from zero calibration that has comprises the following steps：
The startup surrounding air purifier of signal processing unit interruption works and records the pure air detected
Measured value,
The pure air measured value that the signal processing unit detects by comparing and predetermined pure air mark
The difference of definite value come judge the measurement data of the realization device with the presence or absence of drift and measurement data drift degree.
6. the particle concentration detection method according to claim 4 having from zero calibration, which is characterized in that the cleaning
Air measured value is the pure air actual measurement aptitude value detected, and the signal processing unit is surveyed with the pure air
It is pre- in calibration value described in the function pair of the difference of aptitude value aptitude value corresponding with pure air in the calibration value
First the correspondence of definite aptitude value and particle concentration value carries out data calibration.
7. the particle concentration detection method according to claim 4 having from zero calibration, which is characterized in that the cleaning
Air measured value is the pure air actual measurement aptitude value detected, and the signal processing unit is surveyed with the pure air
The particle that the function pair of the difference of aptitude value aptitude value corresponding with pure air in the calibration value detects is dense
Degree carries out data calibration.
8. the particle concentration detection method according to claim 4 having from zero calibration, which is characterized in that the cleaning
Air measured value is the pure air particle concentration measured value detected, and the signal processing unit is with the pure air particle
The correspondence of predetermined aptitude value and particle concentration value carries out in calibration value described in the function pair of concentration measured value
Data calibration.
9. the particle concentration detection method according to claim 4 having from zero calibration, which is characterized in that the cleaning
Air measured value is the pure air particle concentration measured value detected, and the signal processing unit is with the pure air particle
The particle concentration that the function pair of concentration measured value detects carries out data calibration.
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| CN110208155A (en) * | 2019-05-08 | 2019-09-06 | 北京雪迪龙科技股份有限公司 | A kind of Atmospheric particulates unmanned plane monitoring system |
| CN113418844A (en) * | 2021-06-25 | 2021-09-21 | 山东诺方电子科技有限公司 | Dust load collection system and method capable of conducting self-checking |
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