CN106370569A - Particulate matter online monitor signal pre-processing circuit based on Mie scattering - Google Patents
Particulate matter online monitor signal pre-processing circuit based on Mie scattering Download PDFInfo
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- CN106370569A CN106370569A CN201510435621.7A CN201510435621A CN106370569A CN 106370569 A CN106370569 A CN 106370569A CN 201510435621 A CN201510435621 A CN 201510435621A CN 106370569 A CN106370569 A CN 106370569A
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- 239000013618 particulate matter Substances 0.000 title claims abstract description 21
- 238000007781 pre-processing Methods 0.000 title abstract 4
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 230000003321 amplification Effects 0.000 claims abstract description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 37
- 230000008569 process Effects 0.000 claims description 22
- 238000004891 communication Methods 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 5
- 238000012937 correction Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000012795 verification Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 6
- 238000000149 argon plasma sintering Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 235000013399 edible fruits Nutrition 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003909 pattern recognition Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012538 light obscuration Methods 0.000 description 1
- 239000004531 microgranule Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The present invention discloses a particulate matter online monitor signal pre-processing circuit based on Mie scattering. The particulate matter online monitor signal pre-processing circuit comprises an optical path system, a signal acquisition system and a host computer, wherein the optical path system comprises a laser device and a photodetector, and the signal acquisition system comprises a signal conversion, filtering and amplification circuit, an AD acquisition circuit and a single-chip control circuit. According to the present invention, the particulate matter online monitor signal pre-processing circuit has characteristics of simple design and low cost; by combining the hardware circuit and the software algorithm of the slave computer, the influence of the environmental factors on the measurement result is minimized, the darkroom production and the outside gas sample extraction are not required, and the requirements on the mechanical structure, the optical path design and the actual installation are reduced; and the system has high accuracy, high stability and high signal to noise ratio, and is not easily affected by external factors.
Description
Technical field
The present invention relates to a kind of signal preposing signal process circuit of on-line computing model is and in particular to a kind of be based on mie
The signal preposing signal process circuit of the particulate matter on-line computing model of scattering.
Background technology
In recent years, with the continuous quickening of industrial development and urbanization process, Inhalable Particulate pair
People generate and the impact of life is increasing.
It is one based on the technology that light scattering method measures particulate matter parameter particulate matter in space is supervised online
Control, Real-Time Evaluation air quality, instruct dedusting and the practical technique of measurements for reduction.During productive life,
How to measure and enjoy always with the particle diameter distribution of particulate matter in monitoring space and the method for concentration and measuring instrument
The concern of insider.Between in the past few decades, with light scattering method measure particle concentration technology by
Gradually ripe, relative product is gradually improved, and increasing engineer and manufacturing enterprise start this
Technology application is in different field of industrial productions.Because this technology has extensive advantage, become at present
Important method for particle concentration in measurement space.
Below the ultimate principle being measured particle concentration based on light scattering light extinction method is simply introduced: light
During by particulate matter, for the order of magnitude and the granule equal or larger using optical wavelength, light scattering is luminous energy
The principal mode of decay.If microgranule is spatially uniformly distributed at it, dissipating in certain orientation solid angle
Penetrate light energy and particle size, concentration proportion relation, with theoretical model, launched by light
Certain space endoparticle thing concentration can be drawn with the change receiving energy.
Signal preposing signal process circuit problems faced has: first, finite concentration particulate matter dissipates to light in space
Penetrate the decay very little causing light energy, this small-signal is easy to be flooded by various spuious optical signals, need
Signal preposing signal process circuit has higher signal to noise ratio；Second, the change of outside environmental elements can cause light source to send out
The change of light intensity and the drift of circuit part, cause the inaccurate of measurement data.
For the interference of ambient light, the more existing instrument employing measuring particle concentration based on light scattering method
Extraction-type structure, instrument internal construct darkroom, air sample is drawn in darkroom, to the full extent every
The interference to measurement for the ambient light absolutely, but extraction process destroys the gas compartment of original environment, is difficult to measurement knot
Fruit is evaluated；For the change of light source luminescent intensity, take spectroscopical bifocal path structure in structure,
Follow the tracks of intensity of light source change with reference beam, and measuring beam is timed with correction and temperature-compensating, but right
The installation accuracy of light path is higher, and during practical operation, difficulty is larger.
Differential amplifier circuit is adopted on circuit, by the positive input signal comprising measurement result with comprise residing
The reverse input signal of environment, carries out the impact that mathematic interpolation eliminates external environment condition, then carries out main amplification, and one
Aspect can compensate the impact of background natural light, temperature, power supply, electromagnetic interference etc., on the one hand eliminates environment
The change such as impact such as camera lens pollution, flue dust accumulation, but before needing for forward and reverse input signal
The performance of end process circuit, parameter will be mutually matched.In addition, on circuit, also adopting modulation /demodulation
Method, can preferably filter the noise signal beyond modulating frequency, improve the signal to noise ratio of system.
Content of the invention
For solving the above problems, the invention provides a kind of particulate matter on-line computing model based on mie scattering
Signal preposing signal process circuit, has higher degree of accuracy and stability.
For achieving the above object, the technical scheme that the present invention takes is:
Based on mie scattering particulate matter on-line computing model signal preposing signal process circuit, including light path system,
Signal acquiring system and host computer.
Described light path system includes:
Laser instrument, for receiving the square-wave modulation signal from circuit, exports the optical signal through ovennodulation,
Pass through internal light sensitive diode simultaneously and export pd feedback signal；
Photodetector, is used for converting optical signals to photo-signal；
Described signal acquiring system includes:
Signal conversion, filtering, amplifying circuit, for receiving photo-signal, are converted into voltage signal,
And signal is filtered, amplifies；
Ad Acquisition Circuit, for sampling to analog voltage signal, output digit signals are to single-chip microcomputer；
Single chip machine controlling circuit, for receipt signal, measurement signal (or pd signal) is stored,
Again pattern recognition is carried out to signal, filter thick value, respectively average value filtering is carried out to low and high level, filter
Except High-frequency Interference；Then carry out difference operation；Within a bit of time, signal low level represents local environment
Do not comprise the signal of measurement result, deduct low level meansigma methodss with the meansigma methodss of signal high level it is achieved that
The effect of differential output；Feed back the change of signal trace laser instrument luminous intensity finally by pd, with benefit
Repay algorithm, correction and temperature-compensating are timed by certain proportion relation pair measuring beam, and measurement is tied
Fruit exports host computer by rs485 communication interface.
Preferably, using hypotactic communication pattern, anti-including light cell signal processing circuit board and pd
Feedback signal process circuit plate.
Preferably, the communication format of described rs485 communication interface output comprises command format data form.
Preferably, described command format comprises prefix, address, function and suffix, data form comprise prefix,
Address, function, data, verification and suffix.
Preferably, described signal conversion, filtering, amplification module include operational amplifier, electric capacity and resistance,
Input signal is photo-signal and pd signal, and output signal is voltage signal.
Preferably, described ad acquisition module includes ad conversion chip, resistance and the electric capacity of 16.
The method have the advantages that
Design is simple, low cost, combines the software algorithm of slave computer by hardware circuit, at utmost reduces
The impact to measurement result for the environmental factorss it is not necessary to make darkroom and to external world gas sample extract,
Reduce the requirement to frame for movement, light path design and actual installation, system have very high degree of accuracy and
Stability, has higher signal to noise ratio, is not easily susceptible to the interference of extraneous factor.
Brief description
Fig. 1 is the theory diagram of signal preposing signal process circuit in the embodiment of the present invention；
Fig. 2 is the slave computer signal processing block diagram of signal preposing signal process circuit in the embodiment of the present invention；
Fig. 3 is the communication structure host-guest architecture schematic diagram of signal preposing signal process circuit in the embodiment of the present invention；
Fig. 4 is the data form figure of signal preposing signal process circuit in the embodiment of the present invention.
Specific embodiment
In order that objects and advantages of the present invention become more apparent, with reference to embodiments the present invention is carried out
Further describe.It should be appreciated that specific embodiment described herein is only in order to explain the present invention,
It is not intended to limit the present invention.
As Figure 1-4, embodiments provide the particulate matter on-line computing model scattering based on mie
Signal preposing signal process circuit, including light path system 5, signal acquiring system 4 and host computer.
Described light path system includes:
Laser instrument, for receiving the square-wave modulation signal from circuit, exports the optical signal through ovennodulation,
Pass through internal light sensitive diode simultaneously and export pd feedback signal；
Photodetector, is used for converting optical signals to photo-signal；
Described signal acquiring system includes:
Signal conversion, filtering, amplifying circuit 3, for receiving photo-signal, are converted into voltage letter
Number, and signal is filtered, amplifies；
Ad Acquisition Circuit 2, for sampling to analog voltage signal, output digit signals are to single-chip microcomputer；
Single chip machine controlling circuit 1, for receipt signal, measurement signal (or pd signal) is stored,
Again pattern recognition is carried out to signal, filter thick value, respectively average value filtering is carried out to low and high level, filter
Except High-frequency Interference；Then carry out difference operation；Within a bit of time, signal low level represents local environment
Do not comprise the signal of measurement result, deduct low level meansigma methodss with the meansigma methodss of signal high level it is achieved that
The effect of differential output；Feed back the change of signal trace laser instrument luminous intensity finally by pd, with benefit
Repay algorithm, correction and temperature-compensating are timed by certain proportion relation pair measuring beam, and measurement is tied
Fruit exports host computer by rs485 communication interface.
Using hypotactic communication pattern, at light cell signal processing circuit board and pd feedback signal
Reason circuit board.
The communication format of described rs485 communication interface output comprises command format data form.
Described command format comprises prefix, address, function and suffix, data form comprise prefix, address,
Function, data, verification and suffix.
Described signal conversion, filtering, amplification module include operational amplifier, electric capacity and resistance, input signal
For photo-signal and pd signal, output signal is voltage signal.
Described ad acquisition module includes ad conversion chip, resistance and the electric capacity of 16.
Originally it is embodied as one end and connects, to detection, there is the tested region of particulate matter, the other end connects to upper
Machine, in tested region, transmitting terminal laser instrument receives the square-wave modulation signal from circuit, and frequency is several conspicuous
Hereby, the optical signal through ovennodulation for the output, is converted to photo-signal by the light cell of receiving terminal.Meanwhile,
Light sensitive diode output pd feedback signal, photo-signal and the pd within laser instrument process of transmitting terminal
Feedback signal inputs transmitting respectively and receiving terminal circuit is processed.During laser shutdown, collect
It is the signal that local environment does not comprise measurement result, thus providing background reference values.
The above is only the preferred embodiment of the present invention it is noted that common for the art
For technical staff, under the premise without departing from the principles of the invention, some improvements and modifications can also be made,
These improvements and modifications also should be regarded as protection scope of the present invention.
Claims (6)
1. based on mie scattering particulate matter on-line computing model signal preposing signal process circuit it is characterised in that
Including light path system, signal acquiring system and host computer.
Described light path system includes:
Laser instrument, for receiving the square-wave modulation signal from circuit, exports the optical signal through ovennodulation,
Pass through internal light sensitive diode simultaneously and export pd feedback signal；
Photodetector, is used for converting optical signals to photo-signal；
Described signal acquiring system includes:
Signal conversion, filtering, amplifying circuit, for receiving photo-signal, are converted into voltage signal,
And signal is filtered, amplifies；
Ad Acquisition Circuit, for sampling to analog voltage signal, output digit signals are to single-chip microcomputer；
Single chip machine controlling circuit, for receipt signal, measurement signal is stored, then signal is carried out very
Different value filtering, filters thick value, carries out average value filtering to low and high level respectively, filters High-frequency Interference；So
After carry out difference operation；Within a bit of time, signal low level represents local environment and does not comprise measurement result
Signal, deduct low level meansigma methodss with the meansigma methodss of signal high level it is achieved that the effect of differential output；
Feed back the change of signal trace laser instrument luminous intensity finally by pd, with backoff algorithm, by certain
Proportionate relationship is timed correction and temperature-compensating to measuring beam, and measurement result is communicated by rs485
Interface exports host computer.
2. the signal of the particulate matter on-line computing model based on mie scattering according to claim 1 is preposition
Process circuit is it is characterised in that adopt hypotactic communication pattern, including light cell signal processing circuit
Plate and pd feedback signal processing circuit plate.
3. the signal of the particulate matter on-line computing model based on mie scattering according to claim 1 is preposition
Process circuit it is characterised in that described rs485 communication interface output communication format comprise command format and
Data form.
4. the signal of the particulate matter on-line computing model based on mie scattering according to claim 3 is preposition
Process circuit is it is characterised in that described command format comprises prefix, address, function and suffix, data lattice
Formula comprises prefix, address, function, data, verification and suffix.
5. the signal of the particulate matter on-line computing model based on mie scattering according to claim 1 is preposition
Process circuit is it is characterised in that described signal is changed, filters, amplification module includes operational amplifier, electricity
Hold and resistance, input signal is photo-signal and pd signal, output signal is voltage signal.
6. the signal of the particulate matter on-line computing model based on mie scattering according to claim 1 is preposition
Process circuit it is characterised in that described ad acquisition module include 16 ad conversion chip, resistance and
Electric capacity.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107677606A (en) * | 2017-11-20 | 2018-02-09 | 广东上风环保科技有限公司 | A kind of detection circuit based on photometry |
| CN108169089A (en) * | 2017-12-31 | 2018-06-15 | 湖北兴业华德威安全信息技术股份有限公司 | A kind of laser dust sensor and dust concentration sampling zero formula measuring method of school |
| CN108680474A (en) * | 2018-04-13 | 2018-10-19 | 东南大学 | A kind of measuring concentration of granules in certain device and its measurement method based on modulation scattered light intensity |
| CN111474097A (en) * | 2020-06-02 | 2020-07-31 | 杭州绰美科技有限公司 | Extraction type ultralow-concentration dust detection device and method |
| CN115235959A (en) * | 2022-09-21 | 2022-10-25 | 北京航空航天大学 | Method, device and equipment for measuring particle size and readable storage medium |
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| CN102297823A (en) * | 2011-05-17 | 2011-12-28 | 上海理工大学 | Method and apparatus for measuring dynamic light scattering nano-particles based on bandpass filtering |
| CN102879359A (en) * | 2012-09-26 | 2013-01-16 | 中国科学院合肥物质科学研究院 | Atmospheric visibility measuring system |
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Patent Citations (3)
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| CN102135558A (en) * | 2010-11-05 | 2011-07-27 | 重庆市电力公司綦南供电局 | Acquisition and hierarchical identification system of overvoltage data and hierarchical pattern identification method of overvoltage types |
| CN102297823A (en) * | 2011-05-17 | 2011-12-28 | 上海理工大学 | Method and apparatus for measuring dynamic light scattering nano-particles based on bandpass filtering |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107677606A (en) * | 2017-11-20 | 2018-02-09 | 广东上风环保科技有限公司 | A kind of detection circuit based on photometry |
| CN107677606B (en) * | 2017-11-20 | 2023-12-19 | 广东盈峰科技有限公司 | Detection circuit based on photometry |
| CN108169089A (en) * | 2017-12-31 | 2018-06-15 | 湖北兴业华德威安全信息技术股份有限公司 | A kind of laser dust sensor and dust concentration sampling zero formula measuring method of school |
| CN108680474A (en) * | 2018-04-13 | 2018-10-19 | 东南大学 | A kind of measuring concentration of granules in certain device and its measurement method based on modulation scattered light intensity |
| CN111474097A (en) * | 2020-06-02 | 2020-07-31 | 杭州绰美科技有限公司 | Extraction type ultralow-concentration dust detection device and method |
| CN115235959A (en) * | 2022-09-21 | 2022-10-25 | 北京航空航天大学 | Method, device and equipment for measuring particle size and readable storage medium |
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