CN107132167A - High precision two line system industrial dust detection means - Google Patents
High precision two line system industrial dust detection means Download PDFInfo
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- CN107132167A CN107132167A CN201710550341.XA CN201710550341A CN107132167A CN 107132167 A CN107132167 A CN 107132167A CN 201710550341 A CN201710550341 A CN 201710550341A CN 107132167 A CN107132167 A CN 107132167A
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- 239000000428 dust Substances 0.000 title claims abstract description 32
- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 42
- 238000012545 processing Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 5
- 230000002093 peripheral effect Effects 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims abstract description 5
- 238000004364 calculation method Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 8
- 238000004088 simulation Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 239000003245 coal Substances 0.000 abstract description 4
- 238000004891 communication Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction 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
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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Abstract
The invention discloses a kind of high precision two line system industrial dust detection means, including：Analog signal input module, for receiving the analog signal that dust sensor is transmitted；AD conversion module, for the analog signal to be converted into data signal；Digital signal processing module, for carrying out calculation process to the data signal；D/A conversion module, for the data signal after processing to be converted into analog signal and rear end peripheral hardware is output to；Power supply module, for being powered to analog signal input module, AD conversion module, digital signal processing module and D/A conversion module；The analog signal input module, AD conversion module, digital signal processing module and D/A conversion module are sequentially connected.The present invention is realized communication and function of supplying power, is reduced the power consumption of equipment using two-wire system control；Handled using mixed signal, improve the accuracy and sensitivity of equipment, by the embedded program commissioning device of digital signal processing module, effectively increase the accuracy of Dust data measuring on Coal Faces.
Description
Technical field
The present invention relates to field of environment protection equipment, more particularly to a kind of high precision two line system industrial dust detection means.
Background technology
At present, instrument used in industrial dust detection is generally divided into two-wire system and four-wire system, two-wire system by the mode of connection
Instrument is simple, low in energy consumption using cable economy, wiring relative to four-wire system instrument, but load capacity is poor.No matter which kind of controlling party
Formula, sensitivity is the key factor for determining dust detector device operating efficiency, if sensitivity is relatively low, can not ensure that dust is examined
The accuracy and reliability of data are surveyed, so that the truth of dust concentration can not be objectively responded.
The principal element of influence dust detector device sensitivity has at following 2 points：
First, adjustment accuracy is poor：Current dust detector device by potentiometer manual adjustment, and manual adjustment exist it is all
Many uncertain factors, it is impossible to ensure that every instrument reaches perfect condition, thus stability, uniformity are poor, finally influence number
According to accuracy.
2nd, Analog control drawback is more：Current two-wire system dust detector device is analog quantity equipment, i.e., transported by OP
Calculate amplifier and carry out implementation process control, response signal is restricted, and measurement range is limited, and antijamming capability is weak；Even if in four lines
Digital Signal Processing is used in control equipment, used AD conversion chip precision highest is only to 12.
The content of the invention
In order to solve the above technical problems, the invention discloses a kind of high precision two line system industrial dust detection means, including：
Analog signal input module, for receiving the analog signal that dust sensor is transmitted；
AD conversion module, for the analog signal to be converted into data signal；
Digital signal processing module, for carrying out calculation process to the data signal；
D/A conversion module, for the data signal after processing to be converted into analog signal and rear end peripheral hardware is output to；
Power supply module, for analog signal input module, AD conversion module, digital signal processing module and D/A conversion module
Power supply；
The analog signal input module, AD conversion module, digital signal processing module and D/A conversion module are sequentially connected.
As the further improvement of above-mentioned technical proposal, the analog signal input module includes collection and keeps amplification electricity
Road, the collection keeps amplifying circuit to include：Input buffer amplifier, output port buffer amplifier, the first holding capacitor,
Two holding capacitors, sampling resistor, feedback resistance, the first balance resistance, the second balance resistance, the first analog switch and the second mould
Intend switch；
The sampling resistor and the first analog switch are connected on the negative input end of input buffer amplifier；
First balance resistance and the first holding capacitor are connected in parallel on the positive input terminal and output end of input buffer amplifier；
The second balance resistance two ends connect the positive input terminal and simulation ground terminal of input buffer amplifier respectively；
The feedback resistance two ends connect the output end of the first analog switch and output buffer amplifier respectively；
The second holding capacitor two ends connect the negative input end and output end of output buffer amplifier respectively；
The second analog switch two ends connect the output end and output buffer amplifier of input buffer amplifier respectively
Negative input end.
As the further improvement of above-mentioned technical proposal, the analog signal input module also includes current rectifying and wave filtering circuit,
The current rectifying and wave filtering circuit includes：Rectifier transformer, rectifier bridge, filter capacitor and load resistance；
The rectifier transformer two ends connect the first input end and the second input of rectifier bridge respectively；
The filter capacitor and load resistance are connected in parallel on the cathode output end and cathode output end of rectifier bridge.
As the further improvement of above-mentioned technical proposal, the AD conversion module is 24 sigma-delta type ADC analog-to-digital conversion cores
Piece.
As the further improvement of above-mentioned technical proposal, the digital signal processing module is to use ARM Cortex M3 kernels
Processor.
The beneficial effects of the invention are as follows：
1st, controlled using two-wire system, one end input, other end output unite two into one supply lines with signal wire, both threads
Realize communication and function of supplying power, the lower power consumption of equipment；
2nd, using 24 sigma-delta type ADC modulus conversion chips and digital signal processing module, traditional Analog control is changed
Handled for analog- and digital- mixed signal, substantially increase the accuracy and sensitivity of equipment, Dust data measuring on Coal Faces is more accurate；
3rd, debugged automatically and calibrator (-ter) unit by the embedded program of digital signal processing module, precision and uniformity are far above artificial
Debugging, so as to further increase the accuracy of Dust data measuring on Coal Faces.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below by using required in embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ability
For the those of ordinary skill of domain, without having to pay creative labor, it can also obtain other according to these accompanying drawings
Accompanying drawing.
Fig. 1 is principle schematic of the invention；
Fig. 2 keeps amplifying circuit principle schematic for the collection of analog signal input module；
Fig. 3 is the current rectifying and wave filtering circuit principle schematic of analog signal input module.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.
As shown in figure 1, the high precision two line system industrial dust detection means of the present embodiment, including：Analog signal inputs mould
Block 1, for receiving the analog signal that dust sensor 6 is transmitted；AD conversion module 2, for the analog signal to be converted into number
Word signal；Digital signal processing module 3, for carrying out calculation process to the data signal；D/A conversion module 4, for it will handle after
Data signal be converted to analog signal and be output to rear end peripheral hardware 7；Power supply module 5, for analog signal input module 1,
AD conversion module 2, digital signal processing module 3 and D/A conversion module 4 are powered；Analog signal input module 1, AD conversion module 2, number
Word processing module 3 and D/A conversion module 4 are sequentially connected.
The present invention is using two-wire system control, and analog signal inputs from analog signal input module 1, defeated from D/A conversion module 4
Go out, supply lines is united two into one with signal wire, both threads realize communication and function of supplying power, reduce the power consumption of equipment.
AD conversion module 2 is 24 sigma-delta type ADC modulus conversion chips, with high accuracy, low-power consumption, antijamming capability
Strong advantage, the analog signal that accurately can be transmitted dust sensor 6 is converted into data signal, and signal is reduced as far as possible and is lost
Very；Existing four-wire system equipment can only accomplish the A/D conversion accuracy of highest 12,24 of effect far away from the present invention at present
ADC modulus conversion chips.
Digital signal processing module 3 is the processor using ARM Cortex M3 kernels, the production of such as ADI (Ya De promise) company
Super low-power consumption series processors.The processor uses ARM Cortex M3 kernels, is controlled by Direct Programming configurable a variety of
Low power mode of operation.
Because digital signal processing module 3 uses programme-control, realize substantially exempt from debugging, it is non-maintaining, its precision, uniformity,
Stability is far above manual debugging, effectively increases the accuracy of Dust data measuring on Coal Faces.
As shown in Fig. 2 analog signal input module 1, which includes collection, keeps amplifying circuit, the collection keeps amplifying circuit
Including：Input buffer amplifier A1, output port buffer amplifier A2, the first holding capacitor C1, the second holding capacitor C2, sampling
Resistance R1, feedback resistance R2, the first balance resistance R3, the second balance resistance R4, the simulations of the first analog switch K1 and second are opened
Close K2.
Sampling resistor R1 and the first analog switch K1 are connected on input buffer amplifier A1 negative input end；First balance electricity
Resistance R3 and the first holding capacitor C1 is connected in parallel on input buffer amplifier A1 positive input terminal and output end；Second balance resistance R4 two
End connects input buffer amplifier A1 positive input terminal and simulation ground terminal respectively；Feedback resistance R2 two ends connect the first simulation respectively
Switch K1 and output buffer amplifier A2 output end；Second holding capacitor C2 two ends connect output buffer amplifier A2's respectively
Negative input end and output end；Second analog switch K2 two ends connect input buffer amplifier A1 output end respectively and output is buffered
Amplifier A2 negative input end.
Collection of the analog electrical signal that dust sensor 6 is transmitted through analog signal input module 1 keeps amplifying circuit processing
Afterwards, the level value of analog electrical signal can be tracked or keep, so as to ensure follow-up AD conversion precision.
Input buffer amplifier A1 and output buffer amplifier A2 keeps respectively the first holding capacitor C1 and second
Electric capacity C2 is rapidly completed discharge and recharge, and the distortion of analog electrical signal is reduced as far as possible.
Sampling resistor R1 effect is that analog current signal is converted into analog voltage signal, for follow-up sampling and survey
Amount.
Feedback resistance R2 can avoid the limitation of fixed gain bandwidth, and can by the resistance value for reducing feedback resistance R2
To keep loop high-gain while gain is improved.
First balance resistance R3 is used for balancing input buffer amplifier A1 positive input terminals and the offset current of output end so that
The balance of voltage of two terminals.
Second balance resistance R4 is used for balancing the size of input buffer amplifier A1 positive input terminal input currents, prevents electric current
Excessive damage equipment.
As shown in figure 3, analog signal input module 1 also includes current rectifying and wave filtering circuit, the current rectifying and wave filtering circuit includes：It is whole
Convertor transformer U, rectifier bridge V, filter capacitor C and load resistance R.Rectifier transformer U two ends connect the first of rectifier bridge V respectively
Input V1 and the second input V2；Filter capacitor C and load resistance R are connected in parallel on rectifier bridge V cathode output end V3 and negative pole
Output end V4.
Rectifier bridge V utilizes the one-way conduction principle of diode, alternating current is converted into direct current, and pass through filter capacitor C
Both end voltage can not be mutated can only discharge and recharge characteristic, be that follow-up analog-to-digital conversion is carried to obtain smooth pulse voltage signal
For ensureing.
The operation principle of the present invention is as follows：
It is defeated that dust sensor 6 sends the dust concentration information detected to analog signal in the form of analog current signal
Enter module 1, analog current signal is converted to analog voltage signal by analog signal input module 1, and by amplification, rectification, filter
After ripple processing, then send analog voltage signal to AD conversion module 2.
Analog voltage signal is converted into data signal by AD conversion module 2, and sends the data signal to digital processing
Module 3, after a series of working process such as the detection of digital signal processing module 3, filtering, noise reduction, analysis of spectrum, identification, then will
Data signal sends D/A conversion module 4 to.
D/A conversion module 4 converts digital signals into analog signal, and sends the progress corresponding operating of rear end peripheral hardware 7 to.Example
Such as, control instruction can be converted digital signals into, control rear end PLC is operated accordingly；Data signal can also be turned
Corresponding dust concentration data are changed to, are presented on the display of rear end, important parameter is provided for staff.
It is a kind of mixed signal tupe, in industry present invention incorporates Digital Signal Processing and analog signal processing
Still belong to the first time application in dust detection field, and not only conversion speed is fast, precision is high, and power consumption and cost are low, improves powder
It is that enterprise saves cost while dirt accuracy of detection.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (5)
1. a kind of high precision two line system industrial dust detection means, it is characterised in that including：
Analog signal input module, for receiving the analog signal that dust sensor is transmitted；
AD conversion module, for the analog signal to be converted into data signal；
Digital signal processing module, for carrying out calculation process to the data signal；
D/A conversion module, for the data signal after processing to be converted into analog signal and rear end peripheral hardware is output to；
Power supply module, for being supplied to analog signal input module, AD conversion module, digital signal processing module and D/A conversion module
Electricity；
The analog signal input module, AD conversion module, digital signal processing module and D/A conversion module are sequentially connected.
2. high precision two line system industrial dust detection means according to claim 1, it is characterised in that the analog signal
Input module includes collection and keeps amplifying circuit, and the collection keeps amplifying circuit to include：Input buffer amplifier, output end
Buffer amplifier, the first holding capacitor, the second holding capacitor, sampling resistor, feedback resistance, the first balance resistance, the second balance
Resistance, the first analog switch and the second analog switch；
The sampling resistor and the first analog switch are connected on the negative input end of input buffer amplifier；
First balance resistance and the first holding capacitor are connected in parallel on the positive input terminal and output end of input buffer amplifier；
The second balance resistance two ends connect the positive input terminal and simulation ground terminal of input buffer amplifier respectively；
The feedback resistance two ends connect the output end of the first analog switch and output buffer amplifier respectively；
The second holding capacitor two ends connect the negative input end and output end of output buffer amplifier respectively；
The second analog switch two ends connect respectively input buffer amplifier output end and output buffer amplifier it is negative defeated
Enter end.
3. high precision two line system industrial dust detection means according to claim 2, it is characterised in that the analog signal
Input module also includes current rectifying and wave filtering circuit, and the current rectifying and wave filtering circuit includes：Rectifier transformer, rectifier bridge, filter capacitor with
And load resistance；
The rectifier transformer two ends connect the first input end and the second input of rectifier bridge respectively；
The filter capacitor and load resistance are connected in parallel on the cathode output end and cathode output end of rectifier bridge.
4. high precision two line system industrial dust detection means according to claim 1, it is characterised in that the AD conversion mould
Block is 24 sigma-delta type ADC modulus conversion chips.
5. high precision two line system industrial dust detection means according to claim 1, it is characterised in that the digital processing
Module is the processor using ARM Cortex M3 kernels.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710550341.XA CN107132167A (en) | 2017-07-07 | 2017-07-07 | High precision two line system industrial dust detection means |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710550341.XA CN107132167A (en) | 2017-07-07 | 2017-07-07 | High precision two line system industrial dust detection means |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111327488A (en) * | 2019-01-09 | 2020-06-23 | 王娟 | Distributed computer array |
| CN112268566A (en) * | 2020-10-21 | 2021-01-26 | 上海灿瑞科技股份有限公司 | Magnetic sensor device, method and system with configurable active virtual channel parameters |
| CN112595361A (en) * | 2020-12-09 | 2021-04-02 | 郑州铁路职业技术学院 | Tunnel construction environment detecting system |
| CN113654962A (en) * | 2021-08-18 | 2021-11-16 | 青岛环瑞自动化科技有限公司 | High-precision two-wire system industrial dust detection device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111327488A (en) * | 2019-01-09 | 2020-06-23 | 王娟 | Distributed computer array |
| CN112268566A (en) * | 2020-10-21 | 2021-01-26 | 上海灿瑞科技股份有限公司 | Magnetic sensor device, method and system with configurable active virtual channel parameters |
| CN112595361A (en) * | 2020-12-09 | 2021-04-02 | 郑州铁路职业技术学院 | Tunnel construction environment detecting system |
| CN113654962A (en) * | 2021-08-18 | 2021-11-16 | 青岛环瑞自动化科技有限公司 | High-precision two-wire system industrial dust detection device |
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Application publication date: 20170905 |