CN207472723U - A kind of particle concentration detecting system having from zero calibration - Google Patents
A kind of particle concentration detecting system having from zero calibration Download PDFInfo
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- CN207472723U CN207472723U CN201721653106.7U CN201721653106U CN207472723U CN 207472723 U CN207472723 U CN 207472723U CN 201721653106 U CN201721653106 U CN 201721653106U CN 207472723 U CN207472723 U CN 207472723U
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Abstract
A kind of particle concentration detecting system 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.
Description
Technical field
Detection the utility model is related to airborne particles more particularly to a kind of detection of optical principle particle concentration are
System, belongs to air quality monitoring technical field.
Background technology
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 in air for a long time, 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, causes 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 enters in vivo, is detrimental to health.Therefore, accurate measure of air borne particle concentration in surrounding air is shown
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 optical particle detecting system is used for a long time, 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.
Utility model content
In essential characteristic, the utility model, which is provided, introduces optical sensor using small-sized surrounding air purifier
Pure air as detection sample to carry out particle concentration detection method and system from calibration of being zeroed, ask by output characteristics drift
Topic is effectively improved, and improve the measurement accuracy of optical particle concentration detection method and system.This method and system as a result,
Allowing will be net with optical particle sensors module, air is merged into from the airborne particles Concentration Testing of zero calibration in real time
Change in the equipment such as device, fresh air system, air-conditioning, portable air quality detection device.
In the one side of the utility model, there is the particle concentration detecting system from zero calibration to include：Signal processing
Unit, the optical sensor being communicatively coupled with the signal processing unit and the ring by signal processing unit control work
Border air cleaning unit, wherein, the optical sensor sensing is detected into the air sample of its particles detecting regions and output
Electric signal, between the surrounding air purifier and the optical sensor have flow-guiding channel so that the surrounding air
Surrounding air can flow through the particles detecting regions, the surrounding air purifier work unobstructedly when purifier does not work
It is introduced when making 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 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 duct 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 duct 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.
Detection method includes the following steps for the corresponding particle concentration from zero calibration：The signal processing unit interruption
Start the surrounding air purifier to work and record the pure air measured value detected, the signal processing unit passes through
Compare the difference of the pure air measured value and predetermined pure air calibration value detected to judge the particle
The measurement data of 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 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 signal processing unit and data school is carried out with the particle concentration that the function pair of the pure air particle concentration measured value detects
It is accurate.
By reference to combining the detailed description of attached drawing briefly described below, it is better understood with the above-mentioned of the utility model
Aspect and other aspects, the utility model are defined by the appended claims.
Description of the drawings
Attached drawing described here is only used for task of explanation, and is not intended to limit disclosed in the utility model in any way
Range.In addition, shape, proportional sizes and mutual structure composition of each component in figure etc. is exemplary only, for helping
The understanding to the utility model is helped, is not the specific shape for limiting each component of the utility model, proportional sizes and mutual
Structure composition.Those skilled in the art can select various possible as the case may be under the introduction of the utility model
Shape, proportional sizes and mutual structure composition implement the utility model.
Fig. 1 shows a kind of example arrangement with the particle concentration detecting system from zero calibration of the utility model
Schematic diagram.
Fig. 2 shows in some embodiments of the utility model, the knot of optical sensor and surrounding air purifier
Structure schematic diagram.
Specific embodiment
Figures 1 and 2 show that the particle concentration inspection having from zero calibration in some embodiments of the utility model
Examining system.For example, can be to examine applied to air purifier, fresh air system, air-conditioning, portable air quality by the system integration
Survey the optical particle sensors module in device.The system includes：Optical sensor 110, internal light detector 117 sense inside
Light source 111 emit through the first lens 112 collimation detection light 113 be projected to particle sensing area 114 after by KPT Scatter institute
Light that the scattering light 115 of generation is converged by the second lens 116 simultaneously converts the corresponding electric signal of output；It is communicatively coupled to
Signal processing unit 120 between optical 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,
There is flow-guiding channel 150 so that surrounding air purifier 130 between surrounding air purifier 130 and optical sensor 110
Surrounding air can flow through particles detecting regions 114 unobstructedly when not working, to particle when surrounding air purifier 130 works
Detection zone 114 introduces surrounding air 160 through 130 purified pure air 170 of surrounding air purifier.Signal processing list
Member 120 pairs after the electric signal that optical sensor 110 receives is filtered amplification, sampling and digitized processing, formed with
The directly related aptitude value of sensed KPT Scatter luminous intensity, then records, analyzes and calculates the aptitude value information
And the calibration value of storage is referred to determine the particle concentration detected.The calibration value is what is stored in signal processing unit 120
The correspondence of predetermined aptitude value and particle concentration value.In some embodiments, surrounding air purifier 130
The fan 131 of work and high-efficiency air filtering with the closed combination in air duct side of fan 131 are controlled by signal processing unit 120
Device 132（For example, the filter screen of HEPA standards）It forms.In some embodiments, the air duct both sides of fan 131（Air inlet and go out
Air port）It is respectively provided with the high efficiency particle air filter 132 of closed combination.In some embodiments, surrounding air purifier 130 is letter
Number processing unit 120 controls the electrostatic precipitator of work（Do not show in figure）.
Next, with the particle concentration from zero calibration, detection method includes the following steps：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
Number processing unit 120 carries out data school with the particle concentration that the function pair of the pure air particle concentration measured value detects
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 situation of the spirit and essential characteristics without departing substantially from the utility model
Under, the utility model can be implemented by other specific forms.Therefore, this description is considered as schematical in all fields
It is rather than restricted.The scope of the utility model indicates by appended claims, and be intended to the meaning of its equivalent and
In range with all changes be included therein.
Claims (4)
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 predetermined aptitude value and particle concentration value 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 duct 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 duct 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.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108120659A (en) * | 2017-12-01 | 2018-06-05 | 上海先积集成电路有限公司 | A kind of particle concentration detecting system and method having from zero calibration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108120659A (en) * | 2017-12-01 | 2018-06-05 | 上海先积集成电路有限公司 | A kind of particle concentration detecting system and method having from zero calibration |
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