CN206523406U - A kind of infrared PM2.5 concentration sensors - Google Patents
A kind of infrared PM2.5 concentration sensors Download PDFInfo
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- CN206523406U CN206523406U CN201720200508.5U CN201720200508U CN206523406U CN 206523406 U CN206523406 U CN 206523406U CN 201720200508 U CN201720200508 U CN 201720200508U CN 206523406 U CN206523406 U CN 206523406U
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- 230000003321 amplification Effects 0.000 claims description 10
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- 238000012544 monitoring process Methods 0.000 claims 1
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- 229920005989 resin Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- -1 PM2.5 concentration Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
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- 208000030303 breathing problems Diseases 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Abstract
The utility model is related to a kind of infrared PM2.5 concentration sensors, including pcb board, infrared emission/receiving unit, drive circuit unit including at least the current-voltage conversion circuit unit of current-voltage conversion circuit includes filtering and amplifying circuit unit, ON-OFF control circuit unit, the micro controller unit of at least two-way filtering and amplifying circuit with different gains coefficient all the way（MCU）With input/output interface unit.The MCU is used to carry out the PM2.5 concentration signals detected calculating analysis, and result is transmitted to outside by the input interfacing conveyor unit.Infrared PM2.5 concentration sensors manufacturing cost of the present utility model is low, and accuracy of detection is high, correct PM2.5 concentration values can be also exported under ultrahigh concentration, and can make its lower power consumption by intermittent power supply.
Description
Technical field
The utility model is related to PM2.5 concentration sensors field, more particularly to a kind of infrared PM2.5 concentration sensors.
Background technology
As social and economic continues to develop, the living standard of people is improved constantly, and clothing, food, lodging and transportion -- basic necessities of life etc. are more facilitated, but
Along with factors such as population growth and industrialization developments, environmental pollution is increasingly severe, various pollutants and suspended particulate substance
Substantial increase, causes the generation of haze.PM2.5 concentration (diameter is less than 2.5um finely ground particles) therein and health
It is closely bound up, it directly results in being substantially increased the life that gives people and healthy bringing for the various breathing problem incidences of disease
Harmful effect, therefore, the research for suspended particulate substance detection technique in air are very urgent.Recent years, what people were concerned about
Air pollution regulations are mainly the concentration of the concentration of dust, particularly PM2.5 concentration, air purifying process and the production of air cleaning class
Product have obtained swift and violent development, while people are also increasingly paid close attention to PM2.5 numerical value, this is accomplished by a high-precision dust
Detection sensor intuitively embodies the situation in air, to determine the need for purifying room air, or assesses
Environment residing for oneself is if appropriate for some activities of progress.
Current occurs in that many dust sensors, it is common that based on laser or infrared sensor technology.It is wherein red
Outer PM2.5 concentration dust sensor is lasted a long time compared to laser sensor, and price is relatively inexpensive, makes inner air using heating resistor
Flowed but simultaneously because the reason for infrared emission and receiving device itself, in the case of middle low concentration precision it is universal compared with
Low, still further aspect is in the case of dust ultrahigh concentration, though the requirement to precision is relatively low, but due to infrared emission and reception
The reason for device itself, still suffer from the abnormal conditions for occurring the output of saturated phenomenon no signal and occur.And laser PM2.5 concentration dust
Sensor price is high, short life and due to carrying fan so as to air circulation, causes operating current big.So in the market is general
And it is not high, particularly household electrical appliances and it is related to the detection modules of household electrical appliances.In the case where people increasingly pursue high-quality life, urgently
A kind of cheap, easy to carry, with low cost PM2.5 concentration sensors and detection method are needed, on a large scale will
PM2.5 Concentration Testings spread to all trades and professions.
Utility model content
The utility model aims to provide a kind of infrared PM2.5 concentration sensors, to solve existing PM2.5 concentration sensors
Precision it is relatively low and easily there is saturation in the case of dust ultrahigh concentration and no signal export the problem of.For this utility model
The concrete technical scheme of use is as follows：
A kind of infrared PM2.5 concentration sensors, including pcb board, infrared emission/receiving unit, drive circuit unit including
At least current-voltage conversion circuit unit of current-voltage conversion circuit including at least two-way amplification with different gains all the way
Filtering and amplifying circuit unit, ON-OFF control circuit unit, MCU and the input/output interface unit of filter circuit, described is infrared
Transmitter/receiver unit, drive circuit unit, current-voltage conversion circuit unit, filtering and amplifying circuit unit, switch control electricity
Road unit, MCU and input/output interface unit are completely or partially integrated on the pcb board, infrared to form at least two
PM2.5 Concentration Testing circuits, the ON-OFF control circuit unit is electrically connected with the filtering and amplifying circuit unit and the MCU,
For according to the default programs of MCU, the filtering and amplifying circuit of the low gain coefficient in the filtering and amplifying circuit unit to be switched
The filtering and amplifying circuit of paramount gain coefficient, and/or multichannel filtering and amplifying circuit is connected to realize continuous amplification filtering,
The MCU and described infrared emission/receiving unit, drive circuit unit, filtering and amplifying circuit unit, ON-OFF control circuit list
Member and the electrical connection of input/output interface unit, for being arrived via the infrared PM2.5 Concentration Testings electric circuit inspection of at least two-way
PM2.5 concentration signals carry out calculating analysis, and result is transmitted to outside by the input/output interface unit.
Further, the infrared PM2.5 concentration sensors also include pulse signal circuit unit, the pulse signal electricity
Road unit is connected between the MCU and the drive circuit unit, and batch (-type) is carried out to the drive circuit unit to realize
Power supply.
Further, the infrared emission/receiving unit includes infrared emission component and at least one infrared receiver component,
The infrared emission component is driven by the drive circuit, the infrared receiver component and the current-voltage conversion circuit unit
Electrical connection.
Further, the input/output interface unit includes wire communication module or wireless communication module.
Further, the wireless communication module includes infrared communication module, Bluetooth wireless communication module, wifi communications
Module or zigbee communication modules.
The utility model uses above-mentioned technical proposal, has an advantageous effect in that：Infrared PM2.5 concentration of the present utility model
Sensor manufacturing cost is low, and accuracy of detection is high, and correct PM2.5 concentration values can be also exported under ultrahigh concentration, and can
By intermittent power supply, make its lower power consumption.
Brief description of the drawings
Fig. 1 is the system diagram of the infrared PM2.5 concentration sensors according to the utility model embodiment；
Fig. 2 is the schematic flow sheet of the method using the infrared PM2.5 concentration sensors detection PM2.5 concentration shown in Fig. 1；
Fig. 3 is work(under the high concentration using the method for the infrared PM2.5 concentration sensors detection PM2.5 concentration shown in Fig. 1
Consume the schematic flow sheet cut down.
Embodiment
To further illustrate each embodiment, the utility model is provided with accompanying drawing.These accompanying drawings are in the utility model is disclosed
A part for appearance, it is mainly to illustrate embodiment, and running of the associated description of specification to explain embodiment can be coordinated former
Reason.Coordinate and refer to these contents, those of ordinary skill in the art will be understood that other possible embodiments and this practicality are new
The advantage of type.Component in figure is not necessarily to scale, and similar element numbers are conventionally used to indicate similar component.
The utility model is further illustrated in conjunction with the drawings and specific embodiments.Reference picture 1, describes infrared PM2.5
One preferred embodiment of concentration sensor.Infrared PM2.5 concentration sensors 1 include pcb board 10, infrared emission/receiving unit
20th, drive circuit unit 30, current-voltage conversion circuit unit 40, filtering and amplifying circuit unit 50, ON-OFF control circuit unit
60th, micro controller unit (MCU) 70 and input/output interface unit 80, described infrared emission/receiving unit 20, drive circuit
Unit 30, current-voltage conversion circuit unit 40, filtering and amplifying circuit unit 50, ON-OFF control circuit unit 60, MCU and input
Output interface unit 80 whole (as shown in Figure 1) is partially integrated on pcb board 10, dense to form at least infrared PM2.5 of two-way
Degree detection circuit.
Infrared emission/receiving unit 20 may include infrared emission component 21, at least one infrared receiver component 22, make inside
Component 23, enclosure cavity and lens (not shown) of gas flowing etc..Infrared emission component 21 is relative with infrared receiver component 22,
The infrared ray that i.e. infrared emission component 21 is sent directly is connect after passing through the air of PM2.5 concentration to be detected by infrared receiver component 22
Receive.Infrared emission component 21 can be made up of the infrared emission component such as infrared-emitting diode or triode, and its peripheral circuit.It is red
Outer emitting module 21 is driven by drive circuit 30, to launch infrared ray.Infrared receiver component 22 can by infrared receiver component and its
Peripheral circuit is constituted.The component 23 for making internal gas flow is typically heating resistor.Air emitting module and receiving unit it
Between flow through, receiving unit is produced different current signals due to refraction of light etc..
Drive circuit 30 is electrically connected with MCU and input/output interface unit 80, to obtain the institute of driving infrared emission component 21
The power needed.
Current-voltage conversion circuit unit 40 may include at least one group current-voltage conversion circuit 41, you can to there is n many
Group current-voltage conversion circuit, herein n >=1.The current signal that current-voltage conversion circuit 41 is used to produce receiving unit turns
Change voltage signal into.
Filtering and amplifying circuit unit 50 may include at least two groups filtering and amplifying circuits 51, can have m groups to amplify filtered electrical
Road filter circuit, herein m >=2.Different filtering and amplifying circuits 51 has different gain coefficients.Filtering and amplifying circuit 51 can be with
Corresponded with current-voltage conversion circuit 41, or current-voltage conversion circuit 41 can correspond to multichannel amplification filtered electrical all the way
Road 51.Filtering and amplifying circuit 51 is input in MCU again after the voltage that current-voltage conversion circuit 41 is inputted is amplified into filtering
Handled.
ON-OFF control circuit unit 60 is electrically connected with filtering and amplifying circuit unit 50 and MCU, for according to the default journeys of MCU
Sequence, the amplification that the filtering and amplifying circuit 51 of the low gain coefficient in filtering and amplifying circuit unit 50 is switched into high-gain coefficient is filtered
Wave circuit 51, and/or multichannel filtering and amplifying circuit 51 is connected to realize continuous amplification filtering.Preferably, with height increasing
The gain coefficient of the filtering and amplifying circuit 51 of beneficial coefficient is the gain coefficient of the filtering and amplifying circuit 51 with low gain coefficient
50 times to 1000 times.
Input/output interface unit 80 includes data communication interface module and power-supplying interface module etc..Data communication interface mould
Block can include wire communication module or wireless communication module.Wireless communication module is, for example, infrared communication module, bluetooth is wireless
Communication module, wifi communication modules or zigbee communication modules etc..External equipment can be by the power-supplying interface module to infrared
PM2.5 concentration is powered.The PM2.5 concentration signals that MCU will be arrived via described at least two infrared PM2.5 Concentration Testings electric circuit inspections
Carry out calculating analysis and shown result by data communication interface module transfer to the outside of input/output interface unit 80
Show.
In addition, infrared PM2.5 concentration sensors 1 may also include pulse signal circuit unit 90, pulse signal circuit unit
90 are connected between MCU and drive circuit unit 30, carry out intermittent power supply to drive circuit unit 30 to realize, and then make red
The outer service intermittent of PM2.5 concentration sensors 1.When the PM2.5 concentration values that MCU is detected are under ultrahigh concentration, pulse letter
Number circuit unit 90 starts, the infrared service intermittent of PM2.5 concentration sensors 1, so as to reduce infrared PM2.5 concentration sensors 1
Power consumption.
In addition, infrared PM2.5 concentration sensors 1 may choose whether to be encapsulated with shell.Sheathing material can be resin,
Both metal or resin metallic are used cooperatively, it is possible to be designed to various shapes as needed.
Referring to Fig. 2 and 3, illustrate that infrared PM2.5 concentration sensors 1 detect the operation principle of PM2.5 concentration.MCU pairs
Each infrared PM2.5 Concentration Testings electric circuit inspection in road to PM2.5 concentration signals calculated, then by result of calculation with it is default
PM2.5 concentration thresholds are compared analysis, are accordingly maked corrections further according to comparative analysis result, and export PM2.5 concentration values.It is excellent
Selection of land, the method for correction can be one kind of following methods, but be not limited to following methods：To each in same time or period
PM2.5 concentration representated by the signal of road carries out computing that is average, taking median, cumulative mean, weight smooth or extraction mutation etc..
As shown in Fig. 2 the present embodiment only illustrate how under low PM2.5 concentration improve precision, while in high PM2.5
Prevented under concentration data can not export or output data be 0 the problem of.For convenience, present embodiment assumes that infrared PM2.5
Concentration sensor 1 has two-way current-voltage conversion circuit (the first current-voltage conversion circuit and the second current-voltage conversion electricity
Road) and two-way filtering and amplifying circuit (the first filtering and amplifying circuit and the second filtering and amplifying circuit).The two-way current-voltage conversion
Circuit is joined to form the infrared PM2.5 Concentration Testings circuit of two-way with two-way filtering and amplifying circuit respectively.It is assumed here that two-way
The parameter in current-voltage conversion loop is consistent, and the gain coefficient of two-way filtering and amplifying circuit is respectively hFE1 and hFE2, wherein
HFE2 is high-gain coefficient and assumes hFE2=100 times of hFE1.Certainly, hFE2 can also be other hFE1 other multiples, excellent
Selection of land is between 50 times to 1000 times.The high concentration threshold value of PM2.5 concentration set in advance is that β 1, ultrahigh concentration threshold value are β 2.
The voltage of first current-voltage conversion circuit output after the amplification filtering of the first filtering and amplifying circuit via MCU is entered, by internal MCU
Processing calculating obtains corresponding PM2.5 concentration values A1, and the voltage of the second current-voltage conversion circuit output is filtered via the second amplification
Enter MCU after wave circuit amplification filtering, corresponding PM2.5 concentration values A2 is obtained by internal MCU processing calculating.MCU is dense in PM2.5
Degrees of data output current events first judged, when two-way PM2.5 concentration values A1 and A2 high concentration threshold value as β below 1 when, MCU
The PM2.5 concentration values of output are (A1+A2)/2, the i.e. average value of the two；When in two-way PM2.5 concentration values, A is smaller by even 0,
And A1 between 1~β of β 2 when, PM2.5 concentration is in high concentration, signal that infrared emission/receiving circuit is produced and its faint,
Under the relative parameter of first infrared PM2.5 Concentration Testings circuit, saturation fails the first infrared PM2.5 Concentration Testings circuit,
The PM2.5 concentration values of MCU outputs are A2；When in two-way PM2.5 concentration values, A1 is smaller by even 0, and A2 >=β 2 or for 0 when,
PM2.5 concentration enters ultrahigh concentration, and saturation fails the first infrared PM2.5 Concentration Testings circuit, or even the second infrared PM2.5
Concentration Testing circuit may also fail, and now two-way filtering and amplifying circuit is combined as new by MCU controlling switches circuit unit
Filtering and amplifying circuit, the gain coefficient hFE3 ≈ hFE1*hFE2 of new filtering and amplifying circuit, MCU is recalculated according to hFE3
New PM2.5 concentration values, and exported.
As shown in figure 3, the present embodiment only illustrates in the case of PM2.5 concentration superelevation, how to cut down PM2.5 concentration
The power consumption of sensor 1.PM2.5 concentration values inside the readings of MCU first, and compared with default PM2.5 upper limit of concentration threshold alpha
Compared with.If the PM2.5 concentration value ＞ predetermined upper threshold value α that inside is read, pulse signal circuit unit starting, drive circuit list
Power supply of the member to infrared emission and receiving unit is controlled, and is stopped power supply, duration t1, the t1 periods of this power-off
Interior, the PM2.5 concentration values of MCU outputs are predicted according to the slope of the PM2.5 concentration values in the last period, and MCU exports this
The PM2.5 concentration values of prediction.After the completion of power-off time t1, power again, duration t2.MCU reads actual in time period
PM2.5 concentration values are simultaneously exported, while it is dense to calculate PM2.5 when last PM2.5 concentration values are powered with this before last time power-off
The change slope of degree, is designated as new k1.Then, the actual measurement PM2.5 concentration values newly read are entered with set upper limit threshold α again
Row compares, and judges whether to enter intermittent power supply pattern.The present embodiment by intermittence to infrared emission and receiving unit and
The power supply of heat generating component interval, to improve the service efficiency of sensor light emitting source, cuts down the PM2.5 concentration sensing under ultrahigh concentration
Device power consumption, extends the service life of light emitting source, reduces application cost.
Although specifically showing and describing the utility model with reference to preferred embodiment, those skilled in the art should
This is understood, is not departing from the spirit and scope of the present utility model that appended claims are limited, in form and details
On the utility model can be made a variety of changes, be protection domain of the present utility model.
Claims (5)
1. a kind of infrared PM2.5 concentration sensors, it is characterised in that including pcb board, infrared emission/receiving unit, drive circuit
Unit including at least the current-voltage conversion circuit unit of current-voltage conversion circuit including with different gains coefficient all the way
At least two-way filtering and amplifying circuit filtering and amplifying circuit unit, ON-OFF control circuit unit, MCU and input/output interface list
Member, described infrared emission/receiving unit, drive circuit unit, current-voltage conversion circuit unit, filtering and amplifying circuit list
Member, ON-OFF control circuit unit, MCU and input/output interface unit are completely or partially integrated on the pcb board, to be formed extremely
Few infrared PM2.5 Concentration Testings circuit of two-way, the ON-OFF control circuit unit and the filtering and amplifying circuit unit and described
MCU is electrically connected, for according to the default programs of MCU, the amplification of the low gain coefficient in the filtering and amplifying circuit unit to be filtered
Wave circuit switches to the filtering and amplifying circuit of high-gain coefficient, and/or multichannel filtering and amplifying circuit is connected with the company of realization
Continuous amplification filtering, the MCU and described infrared emission/receiving unit, drive circuit unit, filtering and amplifying circuit unit, is opened
Control circuit unit and the electrical connection of input/output interface unit are closed, for being examined via described at least two infrared PM2.5 concentration
The PM2.5 concentration signals that slowdown monitoring circuit is detected carry out calculating analysis, and result is transmitted by the input/output interface unit
To outside.
2. infrared PM2.5 concentration sensors as claimed in claim 1, it is characterised in that also including pulse signal circuit unit,
The pulse signal circuit unit is connected between the MCU and the drive circuit unit, to realize to the drive circuit
Unit carries out intermittent power supply.
3. infrared PM2.5 concentration sensors as claimed in claim 1 or 2, it is characterised in that the infrared emission/reception list
Member includes infrared emission component and at least one infrared receiver component, and the infrared emission component is driven by the drive circuit,
The infrared receiver component is electrically connected with the current-voltage conversion circuit unit.
4. infrared PM2.5 concentration sensors as claimed in claim 1 or 2, it is characterised in that the input/output interface unit
Including wire communication module or wireless communication module.
5. infrared PM2.5 concentration sensors as claimed in claim 4, it is characterised in that the wireless communication module includes red
Outer communication module, Bluetooth wireless communication module, wifi communication modules or zigbee communication modules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720200508.5U CN206523406U (en) | 2017-03-03 | 2017-03-03 | A kind of infrared PM2.5 concentration sensors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720200508.5U CN206523406U (en) | 2017-03-03 | 2017-03-03 | A kind of infrared PM2.5 concentration sensors |
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| Publication Number | Publication Date |
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| CN206523406U true CN206523406U (en) | 2017-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720200508.5U Expired - Fee Related CN206523406U (en) | 2017-03-03 | 2017-03-03 | A kind of infrared PM2.5 concentration sensors |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644869A (en) * | 2017-03-03 | 2017-05-10 | 广州飒括科技有限公司 | Infrared sensor and detection method for concentration of PM2.5 |
| CN110595969A (en) * | 2019-09-23 | 2019-12-20 | 宁波奥克斯电气股份有限公司 | Control method and device of PM2.5 sensor, electric appliance and storage medium |
-
2017
- 2017-03-03 CN CN201720200508.5U patent/CN206523406U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644869A (en) * | 2017-03-03 | 2017-05-10 | 广州飒括科技有限公司 | Infrared sensor and detection method for concentration of PM2.5 |
| CN110595969A (en) * | 2019-09-23 | 2019-12-20 | 宁波奥克斯电气股份有限公司 | Control method and device of PM2.5 sensor, electric appliance and storage medium |
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