CN107741376A - A kind of piezo-electric resonance type PM2.5 monitoring systems - Google Patents
A kind of piezo-electric resonance type PM2.5 monitoring systems Download PDFInfo
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- CN107741376A CN107741376A CN201711291135.8A CN201711291135A CN107741376A CN 107741376 A CN107741376 A CN 107741376A CN 201711291135 A CN201711291135 A CN 201711291135A CN 107741376 A CN107741376 A CN 107741376A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 33
- 239000013078 crystal Substances 0.000 claims abstract description 38
- 239000010453 quartz Substances 0.000 claims abstract description 37
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 37
- 230000009977 dual effect Effects 0.000 claims abstract description 14
- 238000005367 electrostatic precipitation Methods 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 239000012717 electrostatic precipitator Substances 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 7
- 238000013461 design Methods 0.000 claims abstract description 4
- 239000000428 dust Substances 0.000 claims description 5
- 230000003321 amplification Effects 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 238000004513 sizing Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 239000000443 aerosol Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing 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
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
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Abstract
A kind of piezo-electric resonance type PM2.5 monitoring systems, based on piezoelectric resonator frequency-difference method, using modularized design, mainly including control unit, and electrostatic precipitation sampling unit, piezoelectric resonance unit, frequency test unit and the display unit being connected respectively with control unit；Electrostatic precipitation sampling unit mainly includes impact type inertia sizer and electrostatic precipitator；Piezoelectric resonance unit mainly includes piezoelectric quartz crystal resonator, amplifier and low-tension supply.Piezoelectric quartz crystal resonator is the Dual quartz crystals resonator being made up of two identical piezoelectric quartz crystal oscillating circuits, the relational model established between piezoelectric resonator frequency and piezoelectric chip quality, PM2.5 mass concentration is determined according to the change of piezoelectric resonator frequency, one oscillating circuit of Dual quartz crystals resonator is measurement end, and another oscillating circuit is reference edge.The PM2.5 particulate matters acquisition rate of the present invention is stable, its monitoring sensitivity not by including environment temperature etc. factors influenceed.
Description
Technical field
The present invention relates to PM2.5 monitorings, more particularly to a kind of piezo-electric resonance type PM2.5 monitoring systems.
Background technology
PM2.5 refers to fine particle of the particle diameter below 2.5 μm, it has also become the primary pollution of domestic and international urban atmosphere
Thing.Piezoelectricity crystal oscillator method is also known as piezoelectricity crystal oscillator frequency-difference method, is that the change measure PM2.5 mass based on piezoelectric element resonant frequency is dense
The method of degree, there is the advantages that monitoring sensitivity is high, selectivity is good, and device is relatively easy, be increasingly subject to relevant industries personage
Attention, its defect is that PM2.5 particulate matter acquisition rates are not sufficiently stable, and its monitoring sensitivity is vulnerable to many including environment temperature etc.
The influence of factor.
The content of the invention
The technical problems to be solved by the invention are the defects of making up above-mentioned prior art, there is provided a kind of piezo-electric resonance type
PM2.5 monitoring systems.
The technical problem of the present invention is solved by the following technical programs.
This piezo-electric resonance type PM2.5 monitoring systems, based on piezoelectric resonator frequency-difference method, for PM2.5 continuous samplings, reality
When accurate measurements PM2.5 mass concentration.
The characteristics of this piezo-electric resonance type PM2.5 monitoring systems is：
Using modularized design, mainly including control unit, and the electrostatic precipitation being connected respectively with described control unit samples
Unit, piezoelectric resonance unit, frequency test unit and display unit；
The electrostatic precipitation sampling unit mainly includes impact type inertia sizer and electrostatic precipitator；
The piezoelectric resonance unit mainly includes piezoelectric quartz crystal resonator, amplifier and low-tension supply.
The piezoelectric quartz crystal resonator is the biquartz being made up of two identical piezoelectric quartz crystal oscillating circuits
Crystal resonator, the relational model established between piezoelectric resonator frequency and piezoelectric chip quality, according to the change of piezoelectric resonator frequency
Change the mass concentration for determining PM2.5, an oscillating circuit of the Dual quartz crystals resonator is measurement end, another vibration electricity
Road is reference edge, and the factor such as reference edge and environment temperature residing for measurement end is identical, and the frequency and measurement end of reference edge are empty
Frequency during load is identical, and the output of two oscillating circuits inputs difference frequency device and obtains difference frequency signal respectively, to reduce environment temperature etc.
Influence of the factor to piezo-electric crystal detection performance, so as to which reduction includes mass concentration of the factors such as environment temperature to PM2.5
The influence of monitoring sensitivity.
The technical problem of the present invention is solved by technical scheme further below.
Described control unit includes single-chip microcomputer PIC24FJ96, at the coordination control to each part of instrument system, data
Reason and display.
The impact type inertia sizer be nozzle bore be respectively φ 7 mm, φ 5 mm impact type inertia sizer,
For distinguishing below 10 μm of particle separation diameter, less than 2.5 μm of aerosol particle thing.
The electrostatic precipitator mainly include as the piezoelectric quartz crystal plate of dust collecting electrode, electrion pin, high voltage power supply and
Aspiration pump, the piezoelectric quartz crystal plate are mass-sensitive elements, are combined with electrostatic precipitation dust collecting technique, are carried by electrion
High PM2.5 mass concentrations detection sensitivity.
Preferably, the distance between the electrion pin and quartz wafer is 7.0mm ± 0.5mm, and high voltage power supply is
3.0KV power supplys, the constant extraction flow of aspiration pump is 1L/min, and PM2.5 mass concentration detection sensitivities are optimal, to PM2.5
The acquisition rate of particulate matter is stable.
The Dual quartz crystals resonator is the Dual quartz crystals resonator using model 74LS00 chips, the difference
Frequency device is the difference frequency device using model 74LS132 chips.
Preferably, the quartz wafer of the Dual quartz crystals resonator is AT cut types, and crystal diameter is φ 13.7mm, frequency
Rate is 4.998MHz.
The technical problem of the present invention is solved by following further technical scheme.
The frequency test unit mainly includes frequency meter, and the amplification that the frequency meter includes being connected with the difference frequency device is whole
Shape module, frequency dividing selecting module, and reference frequency module, are controlled by described control unit and carry out frequency counting and PM2.5 matter
Concentration is measured to calculate.
The display mainly includes display module, is counted and PM2.5 mass concentration result of calculations for display frequency.
Compared with the prior art, the invention has the advantages that：
The PM2.5 particulate matters acquisition rate of the present invention is stable, and the monitoring sensitivity of PM2.5 mass concentrations is not by including environment temperature etc.
The influence of factors.
Brief description of the drawings
Fig. 1 is the system composition schematic diagram of the specific embodiment of the invention；
Fig. 2 is Fig. 1 sampling unit composition structure chart.
Embodiment
With reference to embodiment and compare accompanying drawing the present invention will be described.
A kind of piezo-electric resonance type PM2.5 monitoring systems as shown in Figure 1 and 2, based on piezoelectric resonator frequency-difference method, for pair
PM2.5 continuous samplings, real-time accurate measurements PM2.5 mass concentration.
Using modularized design, mainly including control unit, and the electrostatic precipitation being connected respectively with control unit samples
Unit, piezoelectric resonance unit, frequency test unit and display unit.
Control unit includes single-chip microcomputer PIC24FJ96, for the coordination control to each part of instrument system, data processing and
Display.
Electrostatic precipitation sampling unit mainly includes impact type inertia sizer and electrostatic precipitator；
Impact type inertia sizer be nozzle bore be respectively φ 7 mm, φ 5 mm impact type inertia sizer, for respectively
Below 10 μm of particle separation diameter, less than 2.5 μm of aerosol particle thing.
Electrostatic precipitator mainly includes as the piezoelectric quartz crystal plate of dust collecting electrode, electrion pin, high voltage power supply and pumping
Pump, piezoelectric quartz crystal plate are mass-sensitive elements, are combined with electrostatic precipitation dust collecting technique, PM2.5 is improved by electrion
Mass concentration detection sensitivity.
Distance between electrion pin and quartz wafer is 7.0mm ± 0.5mm, and high voltage power supply is 3.0KV power supplys, aspiration pump
Extraction flow it is constant be 1L/min, PM2.5 mass concentration detection sensitivities are optimal, steady to the acquisition rate of PM2.5 particulate matters
It is fixed.
Piezoelectric resonance unit mainly includes piezoelectric quartz crystal resonator, amplifier and low-tension supply,
Piezoelectric quartz crystal resonator is the use model being made up of two identical piezoelectric quartz crystal oscillating circuits
The Dual quartz crystals resonator of 74LS00 chips, the relational model established between piezoelectric resonator frequency and piezoelectric chip quality, root
PM2.5 mass concentration is determined according to the change of piezoelectric resonator frequency, the quartz wafer of Dual quartz crystals resonator is AT cut types, brilliant
Body a diameter of φ 13.7mm, frequency 4.998MHz.One oscillating circuit of Dual quartz crystals resonator is measurement end, another
Oscillating circuit is reference edge, and the factor such as reference edge and environment temperature residing for measurement end is identical, the frequency of reference edge and survey
Frequency when measuring end zero load is identical, and the output of two oscillating circuits inputs the difference frequency device using model 74LS132 chips respectively
Difference frequency signal is obtained, to reduce influence of the factors such as environment temperature to piezo-electric crystal detection performance, so as to which reduction includes environment temperature
The influences of the factors to the monitoring sensitivity of PM2.5 mass concentrations such as degree.
Frequency test unit mainly includes frequency meter, and the frequency meter includes the amplification sizing die being connected with the difference frequency device
Block, frequency dividing selecting module, and reference frequency module, control progress frequency counting and PM2.5 mass dense by described control unit
Degree calculates.
Display mainly includes display module, is counted and PM2.5 mass concentration result of calculations for display frequency.
The monitoring place of present embodiment is used as Qianhu Campus of Nanchang University, neighbouring official announces Monitoring Data
Newly-built area of Nanchang City builds engineering school monitoring station, and monitoring cycle is September in 2017-20 days on the 1st, and monitoring result is contrasted such as following table institute
Show（Unit：μg/m3）.
Monitoring result contrast shows that the Monitoring Datas of the PM2.5 mass concentrations of present embodiment is announced with official
Data are close, and data variation trend is consistent, can reflect the situation of change of the PM2.5 mass concentrations of monitored area, meet
The monitoring requirements of PM2.5 mass concentrations.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
Some equivalent substitutes or obvious modification are made on the premise of not departing from present inventive concept, and performance or purposes are identical, all should
It is considered as belonging to the scope of patent protection that the present invention is determined by the claims submitted.
Claims (10)
- A kind of 1. piezo-electric resonance type PM2.5 monitoring systems, based on piezoelectric resonator frequency-difference method, it is characterised in that：Using modularized design, mainly including control unit, and the electrostatic precipitation being connected respectively with described control unit samples Unit, piezoelectric resonance unit, frequency test unit and display unit；The electrostatic precipitation sampling unit mainly includes impact type inertia sizer and electrostatic precipitator；The piezoelectric resonance unit mainly includes piezoelectric quartz crystal resonator, amplifier and low-tension supply;The piezoelectric quartz crystal resonator is the Dual quartz crystals being made up of two identical piezoelectric quartz crystal oscillating circuits Resonator, the relational model established between piezoelectric resonator frequency and piezoelectric chip quality are true according to the change of piezoelectric resonator frequency Determine PM2.5 mass concentration, an oscillating circuit of the Dual quartz crystals resonator is measurement end, and another oscillating circuit is Reference edge.
- 2. piezo-electric resonance type PM2.5 monitoring systems as claimed in claim 1, it is characterised in that：Described control unit includes single-chip microcomputer PIC24FJ96.
- 3. piezo-electric resonance type PM2.5 monitoring systems as claimed in claim 1 or 2, it is characterised in that：The impact type inertia sizer be nozzle bore be respectively φ 7 mm, φ 5 mm impact type inertia sizer.
- 4. piezo-electric resonance type PM2.5 monitoring systems as claimed in claim 3, it is characterised in that：The electrostatic precipitator mainly includes as the piezoelectric quartz crystal plate of dust collecting electrode, electrion pin, high voltage power supply and pumping Pump.
- 5. piezo-electric resonance type PM2.5 monitoring systems as claimed in claim 4, it is characterised in that：Distance between the electrion pin and quartz wafer is 7.0mm ± 0.5mm, and high voltage power supply is 3.0KV power supplys, aspiration pump Extraction flow it is constant be 1L/min.
- 6. piezo-electric resonance type PM2.5 monitoring systems as claimed in claim 5, it is characterised in that：The Dual quartz crystals resonator is the Dual quartz crystals resonator using model 74LS00 chips.
- 7. piezo-electric resonance type PM2.5 monitoring systems as claimed in claim 6, it is characterised in that：The difference frequency device is the difference frequency device using model 74LS132 chips.
- 8. piezo-electric resonance type PM2.5 monitoring systems as claimed in claim 7, it is characterised in that：The quartz wafer of the Dual quartz crystals resonator is AT cut types, and crystal diameter is φ 13.7mm, frequency 4.998MHz.
- 9. piezo-electric resonance type PM2.5 monitoring systems as claimed in claim 8, it is characterised in that：The frequency test unit mainly includes frequency meter, and the frequency meter includes the amplification sizing die being connected with the difference frequency device Block, frequency dividing selecting module, and reference frequency module.
- 10. piezo-electric resonance type PM2.5 monitoring systems as claimed in claim 9, it is characterised in that：The display mainly includes display module.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283105A (en) * | 2018-10-09 | 2019-01-29 | 清华大学深圳研究生院 | A kind of particulate matter sedimentation apparatus for measuring quality and its settling efficiency detection method |
| CN109351709A (en) * | 2018-10-09 | 2019-02-19 | 清华大学深圳研究生院 | A kind of crystal cleaning device based on piezo-electric measurement and crystal clean method |
| CN110231263A (en) * | 2019-05-23 | 2019-09-13 | 武汉大学 | A kind of PM2.5 mass sensor and preparation method thereof with self-cleaning function |
| CN113884407A (en) * | 2020-07-03 | 2022-01-04 | 国网安徽省电力有限公司电力科学研究院 | Electrical equipment leakage online monitoring method and device and computer readable storage medium |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283105A (en) * | 2018-10-09 | 2019-01-29 | 清华大学深圳研究生院 | A kind of particulate matter sedimentation apparatus for measuring quality and its settling efficiency detection method |
| CN109351709A (en) * | 2018-10-09 | 2019-02-19 | 清华大学深圳研究生院 | A kind of crystal cleaning device based on piezo-electric measurement and crystal clean method |
| CN109351709B (en) * | 2018-10-09 | 2023-11-17 | 清华大学深圳国际研究生院 | Crystal cleaning device and crystal cleaning method based on piezoelectric measurement |
| CN110231263A (en) * | 2019-05-23 | 2019-09-13 | 武汉大学 | A kind of PM2.5 mass sensor and preparation method thereof with self-cleaning function |
| CN113884407A (en) * | 2020-07-03 | 2022-01-04 | 国网安徽省电力有限公司电力科学研究院 | Electrical equipment leakage online monitoring method and device and computer readable storage medium |
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