CN102121894A - High-flow industrial dust distributed rapid measurement system - Google Patents
High-flow industrial dust distributed rapid measurement system Download PDFInfo
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- CN102121894A CN102121894A CN 201010581985 CN201010581985A CN102121894A CN 102121894 A CN102121894 A CN 102121894A CN 201010581985 CN201010581985 CN 201010581985 CN 201010581985 A CN201010581985 A CN 201010581985A CN 102121894 A CN102121894 A CN 102121894A
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Abstract
The invention discloses a high-flow industrial dust distributed rapid measurement system, which comprises a monitoring terminal and a remote monitoring center, wherein the monitoring terminal is used for monitoring and obtaining the dust concentration data of an environment, and uploading the dust concentration data to a detection and control center, and comprises an optical sensor, a preposed amplification circuit, a secondary amplification circuit, an analogue-to-digital (AD) interface, a secondary processor and a main processor; a weak electrical signal is output by the optical sensor according to the dust concentration of the working environment, and is input into the AD interface after passing through the preposed amplification circuit and the secondary amplification circuit; the secondary processor performs rapid digital-to-analogue conversion on the data input by the AD interface, obtains the dust concentration data by adopting an n-stage continued fraction algorithm and a Kalman filtering algorithm, and transmits the dust concentration data into the main processor; the main processor packs the data after receiving the dust concentration data, and transmits the packed data to a wireless data transmission module; and the wireless data transmission module transmits the packed data to the remote monitoring center.
Description
Technical field
The present invention relates to industrial pollution monitoring field, relate in particular to the distributed quick measuring system of a kind of big flow industrial dust.
Background technology
Environmental problem has become the key factor of harm health of people, restriction economic development and social stability.Along with The development in society and economy, environmental problem has been put on the agenda of national governments as a unavoidable major issue.The vital task that protect environment, alleviate environmental pollution, containment ecological degeneration trend becomes government's social management.The China environmental protection current situation is severe more, and environmental pollution and ecological disruption have seriously restricted economic sustainable development, have influenced existent environment of people.Therefore, must strengthen control and monitoring to environment, set up perfect monitoring, management system, environment (comprising water quality and atmosphere) monitoring instrument is the source of environmental information, be again the means of environmental quality assessment, monitoring and environmental science management, in order to prevent environmental pollution, cause easily that in environmental administration and each unit of environmental pollution is equipped with the advanced person, the intelligent online monitoring instrument becomes inevitable requirement.
In industries such as mining, thermal power generation, cement manufacturing and glass manufacturing, wave in air at present, brought great health hazard to the field personnel owing to have a large amount of dust particles in product itself or fuel use and the transport process.The operation field of these industries must be equipped corresponding dust arrester; when concentration of dust exceeds standard in the air, open dust arrester and carry out dedusting, then close dust arrester when air quality is up to standard; when protecting environment, reach the target of energy savings, reduction producer cost to be implemented in.
Some advanced manufacturing such as integrated circuit in addition, product qualities such as bio-pharmaceuticals are directly closely related with the air purity of manufacturing shop, under new technical conditions, these industries are also more and more higher to the requirement of air purity, integrated circuit is under 1um technical matters level, it is 10 grades (every cubic feet of volume contains the dust particle number of 0.5um particle diameter in 10) that cleanliness factor requires, 0.5um technology, it is 1 grade even higher that cleanliness factor requires, and under 0.25um technical matters level, it is more than 0.1 grade that cleanliness factor requires, and controlled the largest particles diameter then all will arrive in the 0.1um.Along with the widespread use of the built-in reliability of integrated circuit, the airborne particle counter and the dust concentration analyzer that are adapted to its cleanliness factor requirement become necessary testing tool.
Under the condition that technical merit improves constantly, requirement to the air-borne dust testing tool is also improving constantly, characteristics such as its speed is fast, precision is high, sensitivity height not only will be arranged, also require to have long service life, measurement range is wide, non-secondary pollution, volume are little etc., and some are listed as other index requests.。
Summary of the invention
The object of the invention is to measure simultaneously and realize at the environment dust concentration of multiple spot in certain zone the powder concentration measurement system of unified monitoring.
Technical scheme of the present invention:
Big flow laser dust analyzer optical sensor is as core component, and use 32 ARM to be core processor, after big flow laser dust analyzer optical sensor output signal preposition amplification of process and secondary amplification, gather high-precision analog/numeral mouth, 32 ARM carry out the processing of particular algorithm to data then, and particle concentration is (individual/m
3) be converted into dust concentration (mg/m
3), again operation result is sent into primary processor in real time by parallel interface, primary processor is sent into data the GPRS module thereupon after receiving the dust concentration data, and the dust concentration data send to the remote monitoring center in real time by wireless network.Surveillance center can detect all terminal information of the dust concentration of on-line testing simultaneously in real time, and is presented in real time on the software interface of Surveillance center.
Powder concentration measurement equipment majority can only be realized spot measurement at present, can not realize the connection processing in certain zone and monitoring in real time, and can not realize the quick measurement of big flow.The present invention is to be core component with portable big flow laser dust analyzer optical sensor, and realizes that with 32 arm processors complicated algorithm handles, and realizes the quick measurement of big flow industrial dust.Last primary processor sends to Surveillance center by the GPRS module in real time with dust concentration information, realizes that finally Surveillance center realizes remote distributed real-time monitoring to all the powder concentration measurement terminals in the on-the-spot scope in zone.
Advantage of the present invention:
1, be core component with high performance big flow industrial dust sensor, increased back-blowing device in the structural design of sensor, protection optical frames women's head-ornaments are not subjected to dust pollution.
2,32 ARM series embedded type CPUs are at full speed realized the complicated algorithm computing as the control core of measurement mechanism, and the switching signal of fast processing sensor realizes the quick measurement of industrial dust concentration.
3, measurement mechanism is equipped with RS485 communication, GPRS module, can realize distributed, real-time online remote monitoring.
Description of drawings
Accompanying drawing 2 is big flow industrial dust Fundamentals of Sensors block diagrams;
Accompanying drawing 3 is pre-amplification circuits;
Accompanying drawing 4 is second amplifying circuits;
Accompanying drawing 5 is auxiliary processor circuit diagrams;
Accompanying drawing 6 is total system work block diagrams;
Accompanying drawing 7 is auxiliary processor software workflow figure of big flow dust measurement terminal;
Accompanying drawing 8 is c main processor software processing flow charts;
Accompanying drawing 9 is Surveillance center's monitoring software workflow diagrams;
Accompanying drawing 10 is system's big flow dust measurement terminal power supply block diagrams;
1 is primary processor in the accompanying drawing 1, is 32 ARM9 nuclears, and model is: LPC3130.The 2nd, auxiliary processor is 32 ARM-Cortex nuclears, and model is: STM32F103.The 3rd, portable big flow laser dust analyzer optical sensor.The 4th, pre-amplification circuit.The 5th, second amplifying circuit.The 6th, the ADC input interface of 12 16 passages of auxiliary processor.The 7th, internal memory (SDRAM) chip.The 8th, 16X2 liquid crystal display (LCM).
The 9th, SPI FLASH chip.The 10th, GPRS wireless data sending module.11 is 485 bus interface circuits.
The 12nd, the keystroke interface circuit.The 13rd, USB interface.The 14th, the SD card.15 back-blowing devices.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in accompanying drawing 1, the ultra-weak electronic signal of portable big flow laser dust analyzer optical sensor 3 outputs, through pre-amplification circuit 4, AD analog to digital conversion interface 6 is advanced in 5 back inputs through second amplifying circuit again, the data of 2 pairs of AD analog to digital conversion of auxiliary processor mouth, 6 inputs are changed fast, and then employing n utmost point continued-fraction algorithm and the casual filtering algorithm of Ka Er, after draw the dust concentration data, auxiliary processor 2 is sent into primary processor 1 with the dust concentration data by parallel interface (HPI) again, then to the data processing of packing, and then send into wireless data transfer module 10 (GPRS) by serial port (UART) and mail to the remote monitoring center by the back data of will packing after receiving the dust concentration data for primary processor 1.After data sent successfully, primary processor 1 was presented at the dust concentration data in real time on the liquid crystal display (LCM) again.Whether whether detect usb 13 simultaneously has USB device insertion or SD card 14 to have the SD card to insert, if any then packing data being deposited in USB flash disk or SD card.
SDRAM chip 7 is to use for data space and the code space of expanding primary processor 1 among the figure.SPI FLASH chip 9 is startup chips of primary processor 1, and the start-up code that is used to deposit primary processor 1 is used, but and more operating flag informations of storage system etc.This chip can carry out access according to the address, and the power down content is not lost.
485 bus interface 11 are to use for other terminal in the primary processor 1 online fixed area, can both samely send data to Surveillance center in real time to realize all dust measurement equipment.The effect of information input button 12 is for the relevant identity number information of terminal input and other essential informations are used.
Back-blowing device 15 is in order to prevent that the optical sensor camera lens is subjected to the pollution of dust, to increase the serviceable life that back-blowing device can prolong sensor lens.
As shown in Figure 2, it is the theory diagram of above-mentioned portable big flow laser dust analyzer optical sensor, this portable big flow laser dust analyzer optical sensor is when utilizing airborne dust by sampling channel mouth 34 the incident light scattering to be formed a light pulse signal, effect through avalanche-type photodiode 38, the process that is converted into corresponding amplitude electric impulse signal is linearly carried out the detection of dust quantity and equivalent diameter, background reference level when being transformed the electric pulse amplitude with no particle scattering with the light intensity of the dust scattering flow through in the sampling channel is made comparisons, the size of electric impulse signal is directly proportional with particulate equivalent diameter size, pulse number then reflects the particulate number, because it is very faint that said method detects atomic light scattering signal, adopted the avalanche-type photodiode as radiation source in this research, and designed and be used for the cylindrical lens 33 that horizontal direction strengthen to focus on, strengthen the condenser lens 32 and the aspheric surface short focal length lens group 35 of the effective concentration class of scattered light.
This sensor comprises semiconductor laser 31, condenser lens 32, cylindrical lens 33, dust sampling passage 34, aspheric surface short focal length lens group 35, ellipsoidal reflector 36, attenuator 37 and avalanche-type photodiode 38.Its course of work is, with semiconductor laser 31 as radiation source, and designed and be used for condenser lens 32 and the cylindrical lens 33 that horizontal direction strengthen to focus on, when airborne dust passes through dust sampling passage 34, pass through the effect of aspheric surface short focal length lens group 35 and ellipsoidal reflector 36 and 37 pairs of dust incident of attenuator shadow again, make incident light scatter to avalanche-type photodiode 38, under the effect of avalanche-type photodiode 38, be converted into corresponding amplitude electric impulse signal linearly, this electric impulse signal reflects dust quantity and equivalent diameter.Wherein adopt Avalanche Photo Diode 38 not only photocurrent to be had amplification but also the light of wide wavelength range is had higher sensitivity, and dark current is little.
As shown in Figure 3, pre-amplification circuit 4 has adopted JFET junction field operational amplification circuit, with sample gas by the time dust scattered light pulse that produces speed be complementary.Being avalanche-type photodiode 38 in this testing circuit finishes the conversion of light → electric current as photodetector, and avalanche-type photodiode leakage current under low bias voltage is very little, about 10
-10The A order of magnitude, response speed is fast, and about 10
-7S, about response band width 10GHz, the output current of avalanche-type photodiode is less, is microampere order, so need convert this weak current to proportional with it voltage signal by pre-amplification circuit 4.The avalanche-type photodiode is equivalent to current source, and establishing photogenerated current is I
p, the input impedance of ideal operational amplifier is infinitely great, feedback resistance R
f, according to the discharge circuit analysis rule, if the open-loop gain of amplifier is A
Uo, the equivalent input impedance that then can calculate amplifier is: R
In=R
f/ (1+A
Uo): because A
UoBe the open loop enlargement factor, numerical value is very big, so the value of equivalent input impedance is very little as can be known, is output as V so further can obtain this amplifier
o=I
p* R
f
Avalanche-type photodiode 38 receiving scattered light signals and the current signal that converts it into, this current signal are the luminous energy of photodiode surface reception and the product of avalanche-type photodiode responsiveness.R
fCan convert this current signal to output voltage V
o, finish the conversion of light → electric current → voltage thus.The scattered light that dust produced in the gas converts the pulse voltage signal with respective amplitude to through opto-electronic conversion and amplifying circuit, its follow-up processing accuracy depends on the precision of the electric signal of detecting amplifier output mostly, thereby the design of this preamplifier circuit and development are the piths in this sensor.
Be the schematic diagram of second amplifying circuit 5 as shown in Figure 4, because of the signal of pre-amplification circuit output more stable, signal to noise ratio (S/N ratio) is also higher, but pulse height is less, so still needing to carry out secondary amplifies, in second amplifying circuit, each grade enlargement factor fixes on 10 times substantially, experimental results show that enlargement factor signal to noise ratio (S/N ratio) in the time of 10 times is the highest, adopt capacitive coupling between amplifying circuit is at different levels, in amplifying circuit, adopt JFET to have than higher bandwidth as input stage, snap time is extremely short, input bias current is low, advantages such as offset current and voltage are low, ten minutes is suitable for the low noise applications of particle light scattering sensor circuit.In order to realize higher signal to noise ratio (S/N ratio) and sensitivity, in amplifier circuit, select for use LF357 as amplifier, all select metalfilmresistor in the circuit through screening, electric capacity is selected the good ceramic disc capacitor of high frequency performance for use, and polar capacitor is selected tantalum capacitor for use.
Be auxiliary processor 2 circuit theory diagrams as shown in Figure 5, have the analog to digital conversion interface of 12 16 passages.This circuit is exclusively used in the analog input signal of quick conversion sensor, and carries out n utmost point continued-fraction algorithm and Ka Er and overflow filtering algorithm, after draw the dust concentration data.
Accompanying drawing 6 has embodied the basic framework of distributed remote wireless supervisory control system.
Accompanying drawing 8 is primary processor 1 workflow diagram.Primary processor 1 main effect is that data wireless sends the demonstration of control and liquid crystal display and the control of other IO interface etc.
Accompanying drawing 9 is Surveillance center's monitoring software workflow diagram.Can realize the dust measurement terminal of far-end multiple spot is realized monitoring, and can online demonstration and control.
Accompanying drawing 10 is the system power supply Organization Chart of dust measurement end device, has embodied the distribution situation of the input condition and the each several part circuit voltage of system power supply.
The present invention is in the dust measurement at environment scene, use 32 ARM to be core processor, and cooperate the related software algorithm, realized the quick measurement of high capacity dust concentration, and distributed measurement powder multiple spot dust concentration, and carry out the monitoring of long-distance distribution formula real-time radio.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (7)
1. the big distributed quick measuring system of flow industrial dust is characterized in that, comprises monitoring terminal and remote monitoring center, and described monitoring terminal is used to monitor the dust concentration data that obtain environment, and with described dust concentration data upload to the prosecution center; Wherein said monitoring terminal comprises optical sensor, pre-amplification circuit, second amplifying circuit, AD analog to digital conversion interface, auxiliary processor and primary processor; Described optical sensing is according to the dust concentration output ultra-weak electronic signal of working environment, through pre-amplification circuit, advance AD analog to digital conversion interface through input behind the second amplifying circuit again, auxiliary processor carries out quick digital-to-analog conversion to the data of AD analog to digital conversion mouth input, and then employing n utmost point continued-fraction algorithm and the casual filtering algorithm of Ka Er, draw the dust concentration data, auxiliary processor is sent described dust concentration data into primary processor again, primary processor is packed to data after receiving described dust concentration data, and the back data of will packing are sent into wireless data transfer module and mail to the remote monitoring center.
2. measuring system according to claim 1 is characterized in that, after described packing back data sent successfully, primary processor also was presented at the dust concentration data in real time on the liquid crystal display.
3. measuring system according to claim 2 is characterized in that, whether whether primary processor also detects USB interface has USB device insertion or SD card to have the SD card to insert, if any then packing data being deposited in USB flash disk or SD card.
4. measuring system according to claim 1 is characterized in that, described primary processor adopts 32 ARM.
5. measuring system according to claim 1 is characterized in that, also comprises back-blowing device, prevents that the optical sensor camera lens is subjected to the pollution of dust.
6. measuring system according to claim 1 is characterized in that, described pre-amplification circuit adopts JFET junction field operational amplification circuit.
7. measuring system according to claim 1 is characterized in that, selects for use LF357 as amplifier in the described second amplifying circuit.
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| CN 201010581985 CN102121894A (en) | 2010-12-10 | 2010-12-10 | High-flow industrial dust distributed rapid measurement system |
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| CN 201010581985 CN102121894A (en) | 2010-12-10 | 2010-12-10 | High-flow industrial dust distributed rapid measurement system |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102854112A (en) * | 2012-08-31 | 2013-01-02 | 常熟市德虞矿山机电有限公司 | Dust concentration detector |
| WO2014032317A1 (en) * | 2012-08-31 | 2014-03-06 | 深圳市华星光电技术有限公司 | Cleanness monitoring system and cartridge |
| CN104062211A (en) * | 2014-07-04 | 2014-09-24 | 苏州科技学院 | Rapid measuring device for air dust |
| CN104237089A (en) * | 2014-09-15 | 2014-12-24 | 山东科技大学 | Network sensor |
| CN105206025A (en) * | 2015-09-30 | 2015-12-30 | 立德高科（昆山）数码科技有限责任公司 | Two-dimension-code-based system and two-dimension-code-based method for transmitting dust discharge concentration information |
| CN105784606A (en) * | 2016-04-28 | 2016-07-20 | 无锡昊瑜节能环保设备有限公司 | Optical property based water quality monitoring system |
| CN105953356A (en) * | 2016-04-27 | 2016-09-21 | 北京爱空气科技有限公司 | Detecting method and system for working efficiency of air purifier |
| CN105954162A (en) * | 2016-04-27 | 2016-09-21 | 北京爱空气科技有限公司 | Air detection processing method, system and device |
| CN105973768A (en) * | 2016-04-27 | 2016-09-28 | 北京爱空气科技有限公司 | Air particulate matter detection method, system and device |
| CN108982313A (en) * | 2018-07-23 | 2018-12-11 | 西安电子科技大学 | A kind of distributed PM2.5 concentration detection system and method online |
| CN115468881A (en) * | 2022-11-14 | 2022-12-13 | 珩辉光电测量技术(吉林)有限公司 | Optical equipment for laser particle counting |
| CN117147399A (en) * | 2023-11-01 | 2023-12-01 | 成都派斯光科技有限公司 | Particulate matter concentration measuring device and method |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102854112A (en) * | 2012-08-31 | 2013-01-02 | 常熟市德虞矿山机电有限公司 | Dust concentration detector |
| WO2014032317A1 (en) * | 2012-08-31 | 2014-03-06 | 深圳市华星光电技术有限公司 | Cleanness monitoring system and cartridge |
| CN104062211A (en) * | 2014-07-04 | 2014-09-24 | 苏州科技学院 | Rapid measuring device for air dust |
| CN104237089A (en) * | 2014-09-15 | 2014-12-24 | 山东科技大学 | Network sensor |
| CN105206025A (en) * | 2015-09-30 | 2015-12-30 | 立德高科（昆山）数码科技有限责任公司 | Two-dimension-code-based system and two-dimension-code-based method for transmitting dust discharge concentration information |
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| CN105954162A (en) * | 2016-04-27 | 2016-09-21 | 北京爱空气科技有限公司 | Air detection processing method, system and device |
| CN105973768A (en) * | 2016-04-27 | 2016-09-28 | 北京爱空气科技有限公司 | Air particulate matter detection method, system and device |
| CN105784606A (en) * | 2016-04-28 | 2016-07-20 | 无锡昊瑜节能环保设备有限公司 | Optical property based water quality monitoring system |
| CN108982313A (en) * | 2018-07-23 | 2018-12-11 | 西安电子科技大学 | A kind of distributed PM2.5 concentration detection system and method online |
| CN115468881A (en) * | 2022-11-14 | 2022-12-13 | 珩辉光电测量技术(吉林)有限公司 | Optical equipment for laser particle counting |
| CN117147399A (en) * | 2023-11-01 | 2023-12-01 | 成都派斯光科技有限公司 | Particulate matter concentration measuring device and method |
| CN117147399B (en) * | 2023-11-01 | 2024-01-26 | 成都派斯光科技有限公司 | Particulate matter concentration measuring device and method |
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Application publication date: 20110713 |