CN204789251U - Leading treatment circuit of signal of particulate matter on -line monitoring appearance based on mie scattering - Google Patents
Leading treatment circuit of signal of particulate matter on -line monitoring appearance based on mie scattering Download PDFInfo
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- CN204789251U CN204789251U CN201520536726.7U CN201520536726U CN204789251U CN 204789251 U CN204789251 U CN 204789251U CN 201520536726 U CN201520536726 U CN 201520536726U CN 204789251 U CN204789251 U CN 204789251U
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Abstract
The utility model discloses a leading treatment circuit of signal of particulate matter on -line monitoring appearance based on mie scattering, including optic system, signal acquisition system and host computer, optic system includes laser instrument and photoelectric detector, signal acquisition system includes signal conversion, filtering, amplifier circuit, AD acquisition circuit and single -chip control circuit. The utility model relates to a simply, with low costs, combine the software algorithm of the next machine through hardware circuit, the at utmost has reduced the influence of environmental factor to measuring result, need not make the darkroom and extract with gaseous sample to external world, has reduced mechanical structure, light path design and actual requirement of installing, the system has very high accuracy and stability, has higher SNR, is difficult for receiving external factors's interference.
Description
Technical field
The utility model relates to a kind of signal preposing signal process circuit of on-line computing model, is specifically related to a kind of signal preposing signal process circuit of the particle on-line computing model based on Mie scattering.
Background technology
In recent years, along with the continuous quickening of industrial development and urbanization process, Inhalable Particulate people are generated and the impact of life increasing.
The technology measuring particle parameter based on light scattering method is one and particle in space is carried out to on-line monitoring, Real-Time Evaluation air quality, instructs the practical technique of dedusting and measurements for reduction.In productive life process, how in measurement and monitoring space, the domain size distribution of particle and the method for concentration and surveying instrument enjoy the concern of insider always.In the past few decades, along with light scattering method measures the ripe gradually of particle concentration technology, relative product is gradually improved, and increasing slip-stick artist and manufacturing enterprise start this technology to be applied in different field of industrial productions.Because this technology has advantage widely, become the important method of particle concentration in measurement space at present.
Simply introduce the ultimate principle measuring particle concentration based on light scattering light extinction method below: when light is by particulate matter, for the particle that the order of magnitude is equal or larger with using optical wavelength, light scattering is the principal mode of optical energy attenuation.If particulate is spatially uniformly distributed at it, scattered energy in certain orientation solid angle and particle size, concentration proportion relation, use theoretical model, certain space endoparticle substrate concentration can be drawn by the change of light emission and received energy.
Signal preposing signal process circuit problems faced has: one, in space, the scattering of finite concentration particle to light causes the decay of luminous energy very little, this feeble signal is easy to be flooded by various parasitic light signal, needs signal preposing signal process circuit to have higher signal to noise ratio (S/N ratio); Its two, the change of outside environmental elements can cause the change of light source luminescent intensity and the drift of circuit part, causes the inaccurate of measurement data.
For the interference of ambient light, the more existing instrument employing extraction-type structure measuring particle concentration based on light scattering method, in instrument internal structure darkroom, air sample is drawn in darkroom, isolated ambient light is to the interference of measuring to the full extent, but extraction process destroys the gas space of original environment, be difficult to evaluate measurement result; For the change of light source luminescent intensity, structurally take spectroscopical bifocal path structure, follow the tracks of intensity of light source change with reference beam, and correction of timing and temperature compensation are carried out to measuring beam, but higher to the installation accuracy of light path, during practical operation, difficulty is larger.
Circuit adopts differential amplifier circuit, to the forward input signal of measurement result be comprised and comprise the reverse input signal of residing environment, carry out the impact that mathematic interpolation eliminates external environment condition, carry out main amplification again, on the one hand can the impact of compensate for background natural light, temperature, power supply, electromagnetic interference (EMI) etc., eliminate on the one hand the change of environment as impacts such as camera lens pollutions, flue dust accumulation, but needs to mate mutually for the performance of forward and reverse input signal front-end processing circuit, parameter.In addition, on circuit, also have and adopt the method for modulation /demodulation, can noise signal beyond filtering modulating frequency preferably, improve the signal to noise ratio (S/N ratio) of system.
Utility model content
For solving the problem, the utility model provides a kind of signal preposing signal process circuit of the particle on-line computing model based on Mie scattering, has higher degree of accuracy and stability.
For achieving the above object, the technical scheme that the utility model is taked is:
Based on the signal preposing signal process circuit of the particle on-line computing model of Mie scattering, comprise light path system, signal acquiring system and host computer.
Described light path system comprises:
Laser instrument, for receiving the square-wave modulation signal from circuit, exports the light signal through ovennodulation, exports PD feedback signal by inner photodiode simultaneously;
Photodetector, for being converted to photo-signal by light signal;
Described signal acquiring system comprises:
Signal conversion, filtering, amplifying circuit, for receiving photo-signal, be converted into voltage signal, and carry out filtering, amplification to signal;
AD Acquisition Circuit, for sampling to analog voltage signal, output digit signals is to single-chip microcomputer;
Single chip machine controlling circuit, for Received signal strength, stores measuring-signal (or PD signal), carries out filtering process, difference operation to signal; And measurement result is outputted to host computer by RS485 communication interface.
As preferably, adopt hypotactic communication pattern, comprise photoelectric cell signal processing circuit board and PD feedback signal processing circuit plate.
As preferably, described signal conversion, filtering, amplification module comprise operational amplifier, electric capacity and resistance, and input signal is photo-signal and PD signal, outputs signal as voltage signal.
As preferably, described AD Acquisition Circuit comprises AD conversion chip, resistance and the electric capacity of 16.
The utility model has following beneficial effect:
Simplicity of design, cost are low, by the software algorithm of hardware circuit in conjunction with slave computer, at utmost reduce the impact of environmental factor on measurement result, do not need make darkroom and to external world gas sample extract, reduce the requirement to physical construction, light path design and actual installation, system has very high degree of accuracy and stability, has higher signal to noise ratio (S/N ratio), is not vulnerable to the interference of extraneous factor.
Accompanying drawing explanation
Fig. 1 is the theory diagram of signal preposing signal process circuit in the utility model embodiment;
Fig. 2 is the slave computer signal transacting block diagram of signal preposing signal process circuit in the utility model embodiment;
Fig. 3 is the communication structure host-guest architecture schematic diagram of signal preposing signal process circuit in the utility model embodiment;
Fig. 4 is the data layout figure of signal preposing signal process circuit in the utility model embodiment.
Embodiment
In order to make the purpose of this utility model and advantage clearly understand, below in conjunction with embodiment, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As Figure 1-4, the utility model embodiment provides the signal preposing signal process circuit of the particle on-line computing model based on Mie scattering, comprises light path system 5, signal acquiring system 4 and host computer.
Described light path system comprises:
Laser instrument, for receiving the square-wave modulation signal from circuit, exports the light signal through ovennodulation, exports PD feedback signal by inner photodiode simultaneously;
Photodetector, for being converted to photo-signal by light signal;
Described signal acquiring system comprises:
Signal conversion, filtering, amplifying circuit 3, for receiving photo-signal, be converted into voltage signal, and carry out filtering, amplification to signal;
AD Acquisition Circuit 2, for sampling to analog voltage signal, output digit signals is to single-chip microcomputer;
Single chip machine controlling circuit 1, for Received signal strength, stores measuring-signal (or PD signal), then carries out pattern recognition to signal, the thick value of filtering, to be averaged value filtering respectively to low and high level, filtering high frequency interference; Then difference operation is carried out; Within a bit of time, the residing environment of signal low level representative does not comprise the signal of measurement result, deducts low level mean value, achieve the effect of differential output with the mean value of signal high level; Follow the tracks of the change of laser instrument luminous intensity finally by PD feedback signal, use backoff algorithm, by certain proportion relation, correction of timing and temperature compensation are carried out to measuring beam, and measurement result is outputted to host computer by RS485 communication interface.
Adopt hypotactic communication pattern, comprise photoelectric cell signal processing circuit board and PD feedback signal processing circuit plate.
The communication format that described RS485 communication interface exports comprises command format and data layout.
Described command format comprises prefix, address, function and suffix, and data layout comprises prefix, address, function, data, School Affairs suffix.
Described signal conversion, filtering, amplification module comprise operational amplifier, electric capacity and resistance, and input signal is photo-signal and PD signal, outputs signal as voltage signal.
Described AD Acquisition Circuit comprises AD conversion chip, resistance and the electric capacity of 16.
This concrete one end of implementing is connected to the tested region detected and have particle, the other end is connected to host computer, in tested region, transmitting terminal laser instrument receives the square-wave modulation signal from circuit, frequency is several hertz, export the light signal through ovennodulation, be converted to photo-signal by the photoelectric cell of receiving end.Meanwhile, the laser instrument of transmitting terminal exports PD feedback signal through inner photodiode, and photo-signal and PD feedback signal input transmitting and receiving terminal circuit respectively and process.During laser shutdown, what collect is the signal that residing environment do not comprise measurement result, thus provides a background reference values.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (4)
1. based on the signal preposing signal process circuit of the particle on-line computing model of Mie scattering, it is characterized in that, comprise light path system, signal acquiring system and host computer;
Described light path system comprises:
Laser instrument, for receiving the square-wave modulation signal from circuit, exports the light signal through ovennodulation, exports PD feedback signal by inner photodiode simultaneously;
Photodetector, for being converted to photo-signal by light signal;
Described signal acquiring system comprises:
Signal conversion, filtering, amplifying circuit, for receiving photo-signal, be converted into voltage signal, and carry out filtering, amplification to signal;
AD Acquisition Circuit, for sampling to analog voltage signal, output digit signals is to single-chip microcomputer;
Single chip machine controlling circuit, for Received signal strength, stores measuring-signal, carries out filtering process, difference operation to signal; And measurement result is outputted to host computer by RS485 communication interface.
2. the signal preposing signal process circuit of the particle on-line computing model based on Mie scattering according to claim 1, is characterized in that, adopt hypotactic communication pattern, comprises photoelectric cell signal processing circuit board and PD feedback signal processing circuit plate.
3. the signal preposing signal process circuit of the particle on-line computing model based on Mie scattering according to claim 1, it is characterized in that, described signal conversion, filtering, amplification module comprise operational amplifier, electric capacity and resistance, input signal is photo-signal and PD signal, outputs signal as voltage signal.
4. the signal preposing signal process circuit of the particle on-line computing model based on Mie scattering according to claim 1, is characterized in that, described AD Acquisition Circuit comprises AD conversion chip, resistance and the electric capacity of 16.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520536726.7U CN204789251U (en) | 2015-07-22 | 2015-07-22 | Leading treatment circuit of signal of particulate matter on -line monitoring appearance based on mie scattering |
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| CN201520536726.7U CN204789251U (en) | 2015-07-22 | 2015-07-22 | Leading treatment circuit of signal of particulate matter on -line monitoring appearance based on mie scattering |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109187357A (en) * | 2018-09-04 | 2019-01-11 | 南京大学 | A kind of atmospheric visibility and turbulent flow synchronized measurement system and measurement method |
| CN109342281A (en) * | 2018-09-13 | 2019-02-15 | 北京雪迪龙科技股份有限公司 | The laser dust monitor and monitoring method of digital modulation and demodulation |
-
2015
- 2015-07-22 CN CN201520536726.7U patent/CN204789251U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109187357A (en) * | 2018-09-04 | 2019-01-11 | 南京大学 | A kind of atmospheric visibility and turbulent flow synchronized measurement system and measurement method |
| CN109342281A (en) * | 2018-09-13 | 2019-02-15 | 北京雪迪龙科技股份有限公司 | The laser dust monitor and monitoring method of digital modulation and demodulation |
| CN109342281B (en) * | 2018-09-13 | 2021-10-01 | 北京雪迪龙科技股份有限公司 | Laser dust monitor with digital modulation and demodulation and monitoring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Tianjin science and Technology Co., Ltd. Assignor: Tianjin Tongyang Science &Technology Development Co., Ltd. Contract record no.: 2016120000033 Denomination of utility model: The signal preposing signal process circuit of the particulate matter on-line computing model based on mie scattering Granted publication date: 20151118 License type: Common License Record date: 20161024 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model |