CN101598657A - The method of a kind of sensor of dust concentration and measurement dust concentration thereof - Google Patents
The method of a kind of sensor of dust concentration and measurement dust concentration thereof Download PDFInfo
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- CN101598657A CN101598657A CNA2009101495477A CN200910149547A CN101598657A CN 101598657 A CN101598657 A CN 101598657A CN A2009101495477 A CNA2009101495477 A CN A2009101495477A CN 200910149547 A CN200910149547 A CN 200910149547A CN 101598657 A CN101598657 A CN 101598657A
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Abstract
The invention discloses the method for a kind of sensor of dust concentration and measurement dust concentration thereof.Described sensor of dust concentration comprises: blower fan, guiding device, air chamber, light source, photodiode and single-chip microcomputer; Described blower fan makes described air chamber produce negative pressure; Described guiding device when described air chamber produces negative pressure, sucks described air chamber with dust laden air; Described light source is for the dust of dust laden air in the described air chamber provides illumination, to produce scattered light; Described photodiode is converted into voltage signal with described scattered light, and exports described voltage signal; Described single-chip microcomputer is according to the voltage signal of described photodiode output and voltage signal that prestores and dust concentration proportionate relationship calculating dust concentration.By the present invention, sensor of dust concentration need not high pressure when carrying out opto-electronic conversion, and then has eliminated potential safety hazard.
Description
Technical field
The present invention relates to sensor technical field, relate in particular to the method for a kind of sensor of dust concentration and measurement dust concentration thereof.
Background technology
The dust collector can be used to measure dust concentration.Measuring process comprises: the dust collector extracts the dust laden air of certain volume, and dust-filtering on filter membrane, is calculated the concentration of dust by the value of filter membrane weightening finish.This metering system not only is not easy to operation, and can not continuous coverage.
Sampling thief is demarcated the dust laden air that collects, direct-reading dust tester utilizes principles such as light scattering or the absorption of β source that calibrated dust laden air is detected, can obtain current dust concentration immediately, but it is limited to measure number of times, can not be to the dust concentration continuous detecting.
Continuous detecting direct-reading dust concentration sensor can the continuous detecting dust concentration.Measuring process comprises: the driven by motor blade rotation of continuous detecting direct-reading dust concentration sensor internal, and then dust laden air sucked its darkroom, use the dust in the self-contained light source irradiation dust laden air, the scattered light that dust produces is converted into electric signal output, uses for safety detecting system.
But continuous detecting direct-reading dust concentration sensor usually needs when carrying out opto-electronic conversion for it provides high pressure more than the 100v, and this has constituted potential safety hazard in the dust work place.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of sensor of dust concentration and has measured the method for dust concentration, need not high pressure when carrying out opto-electronic conversion, and then eliminates safe hidden trouble.
A kind of sensor of dust concentration, described sensor of dust concentration comprises:
Blower fan, guiding device, air chamber, light source, photodiode and single-chip microcomputer;
Described blower fan makes described air chamber produce negative pressure;
Described guiding device when described air chamber produces negative pressure, sucks described air chamber with dust laden air;
Described light source is for the dust of dust laden air in the described air chamber provides illumination, to produce scattered light;
Described photodiode is converted into voltage signal with described scattered light, and exports described voltage signal;
Described single-chip microcomputer is according to the voltage signal of described photodiode output and voltage signal that prestores and dust concentration proportionate relationship calculating dust concentration.
Alternatively, it is characterized in that described sensor of dust concentration also comprises:
Photoelectricity prolongs pipe, increases described photodiode, contacts described dust to avoid described photodiode.
Alternatively, described sensor of dust concentration also comprises:
The photoelectricity base is placed collector lens;
Described collector lens increases the photosensitive area of described photodiode.
Preferably, described guiding device comprises:
The point mouth sucks described dust laden air;
The loudspeaker mouth, described dust laden air is sent into described air chamber;
Gather end cap, connect described sharp mouth and described loudspeaker mouth;
Light trap with at least one air admission hole stops that extraneous light enters described air chamber, and described dust laden air is passed through.
Alternatively, it is characterized in that described sensor of dust concentration also comprises:
Light source lampshade, fixing described light source.
Preferably, described air chamber adopts the straight barrel type structure, to reduce the negative pressure pressure drop in the described air chamber.
Preferably, described air chamber inwall is a black, produces reflected light to avoid described air chamber inwall.
Alternatively, described sensor of dust concentration also comprises:
Alarm unit, the dust concentration of measuring when described sensor of dust concentration give the alarm during greater than prevalue.
Alternatively, described sensor of dust concentration also comprises:
The RS485 IO interface makes described sensor of dust concentration insert various mine supervision system.
Alternatively, described sensor of dust concentration also comprises:
Frequency Output Interface Circuit makes described sensor of dust concentration insert various mine supervision system by frequency signal.
Alternatively, described sensor of dust concentration also comprises:
The infrared remote control input block receives the instruction of telepilot, makes described single-chip microcomputer according to described instruction executable operations.
Alternatively, described sensor of dust concentration also comprises:
Programmable amplifying circuit amplify the voltage signal of described photodiode output, and the voltage signal after will amplifying is exported to single-chip microcomputer;
Described single-chip microcomputer is according to the voltage signal after amplifying and voltage signal that prestores and dust concentration proportionate relationship calculating dust concentration.
A kind of sensor of dust concentration is measured the method for dust concentration, and described method comprises:
Starting blower fan makes air chamber produce negative pressure;
Under the effect of described negative pressure, dust laden air is sucked described air chamber by guiding device;
Dust laden air in the described air chamber of light source irradiation is to produce scattered light;
Photodiode is converted into voltage signal and output with described scattered light;
Single-chip microcomputer is according to the voltage signal of described photodiode output and voltage signal that prestores and dust concentration proportionate relationship calculating dust concentration.
Preferably, described photodiode is converted into described scattered light voltage signal and exports and comprises:
Photodiode is converted into voltage signal with described scattered light, and described voltage signal is exported to programmable amplifying circuit, so that described programmable amplifying circuit amplifies described voltage signal;
Described single-chip microcomputer comprises with dust concentration proportionate relationship calculating dust concentration according to the voltage signal of described photodiode output and the voltage signal that prestores:
Described single-chip microcomputer calculates dust concentration according to the voltage signal that has amplified and the voltage signal that prestores and dust concentration proportionate relationship.
As can be seen, sensor of dust concentration during operation, carry out opto-electronic conversion by photodiode, because photodiode can obtain bigger voltage by increasing negative feedback resistor, and then obtain the multiplication effect, therefore, the sensor of dust concentration that the embodiment of the invention provides is during opto-electronic conversion, need not again to it provides high pressure, thereby eliminated potential safety hazard.
Description of drawings
A kind of sensor of dust concentration structural representation that Fig. 1 provides for the embodiment of the invention one;
The another kind of sensor of dust concentration structural representation that Fig. 2 provides for the embodiment of the invention two;
Fig. 3 is the electrical block diagram of sensor of dust concentration in the embodiment of the invention two;
The another kind of sensor of dust concentration structural representation that Fig. 4 provides for the embodiment of the invention three;
A kind of measuring method process flow diagram that Fig. 5 provides for the embodiment of the invention four;
The another kind of measuring method process flow diagram that Fig. 6 provides for the embodiment of the invention five.
Embodiment
For above-mentioned feature, the advantage that makes the embodiment of the invention becomes apparent more, be elaborated below in conjunction with embodiment and Figure of description.
At first, it is pointed out that the inventor of the embodiment of the invention studies current continuous detecting direct-reading dust concentration sensor, find that it needs the reason of high pressure to be when opto-electronic conversion: utilized photomultiplier to realize opto-electronic conversion.Photomultiplier utilizes secondary to make the photoelectron multiplication of effusion, obtains higher sensitivity, the energy measurement weak one.Photomultiplier can obtain faint electric current when opto-electronic conversion, therefore, when photomultiplier carries out opto-electronic conversion, need provide high pressure so that secondary is carried out repeatedly for it, and then reach the multiplication effect, obtains bigger electric current.
The inventor of the embodiment of the invention finally determines and can replace photomultiplier to carry out opto-electronic conversion with photodiode, and can obtain required opto-electronic conversion multiplying power through repetition test.Photodiode output be voltage signal, light signal is converted into electric current after, can obtain bigger voltage by increasing negative feedback resistor, therefore, need not can obtain the effect that doubles to the photodiode high pressure.
The sensor of dust concentration that the embodiment of the invention is provided is elaborated below.
Please refer to Fig. 1, a kind of sensor of dust concentration structural representation for the embodiment of the invention one provides can comprise:
Guiding device 102 is used for when air chamber 103 produces negative pressure dust laden air being sucked air chamber 103;
The scattered light that photodiode 105 is used for receiving is converted into voltage signal, and voltage signal is exported;
Single-chip microcomputer 106 is used for according to the voltage signal of photodiode 105 outputs and voltage signal that prestores and dust concentration proportionate relationship calculating dust concentration.
As can be seen, sensor of dust concentration during operation, carry out opto-electronic conversion by photodiode 105, because photodiode 105 can obtain bigger voltage by increasing negative feedback resistor, and then obtain the multiplication effect, therefore, the sensor of dust concentration that the embodiment of the invention provides is during opto-electronic conversion, need not again to it provides high pressure, thereby eliminated potential safety hazard.
Below in conjunction with specific embodiment more the sensor of dust concentration that the embodiment of the invention provides is described.
Please refer to Fig. 2, the another kind of sensor of dust concentration structural representation for the embodiment of the invention two provides can comprise:
After blower fan 201 starts, produce negative pressure in the air chamber 203, dust laden air is inhaled into air chamber 203 through guiding device 202, light source 204 sends the emergent light perpendicular to blower fan, because the existence of dust in the dust laden air, the emergent light of light source 204 produces scattered light in air chamber 203, photoelectricity harvester 205 collection of scattered light, and utilize the photodiode that wherein comprises that light signal is converted into voltage signal, voltage signal enters single-chip microcomputer by programmable amplifying circuit, and voltage signal that the single-chip microcomputer utilization prestores and dust concentration proportionate relationship calculate current dust concentration.Electric signal that prestores in the single-chip microcomputer and dust concentration proportionate relationship obtain by experiment.For example: suppose that the voltage signal and the dust concentration proportionate relationship that prestore are 100mg/m
3The voltage signal that/v, single-chip microcomputer receive is 1v, and then dust concentration is calculated by following formula: 1v * 100mg/m
3/ v=100mg/m
3
Alternatively, can also comprise light source lampshade, be used for fixing light source 204.
The sensor of dust concentration that the embodiment of the invention provides can be applied to dust-laden working scenes such as colliery, is that example describes to be applied to the colliery scene only below.When being applied to the colliery scene, the power supply of the sensor of dust concentration that the embodiment of the invention provides is an intrinsic safety electric source.
Please refer to Fig. 3, the electrical block diagram for sensor of dust concentration in the embodiment of the invention two can comprise:
Intrinsic safety electric source 301, the sensor of dust concentration power supply that is used to the embodiment of the invention to provide comprises: be microcontroller power supply 302 power supplies, be 303 power supplies of photodiode power supply, be motor power 304 power supplies;
Motor power 304: be used to the motor power supply;
Single-chip microcomputer 305, be used to prestore voltage signal and dust concentration proportionate relationship, and utilize this proportionate relationship to calculate current dust concentration;
Light-emitting diode display 306 is used to show dust concentration and other functional module;
Frequency Output Interface Circuit 308 is used to make sensor of dust concentration that the embodiment of the invention provides to insert various mine supervision system by frequency signal;
Infrared remote controller input block 310 is used to receive the instruction of telepilot, makes single-chip microcomputer 305 according to the instruction executable operations;
Please refer to Fig. 4, the another kind of sensor of dust concentration structural representation for the embodiment of the invention three provides in Fig. 4, uses laser lamp 1 as light source.Parts shown in Figure 4 can comprise:
Wherein, a part and the laser lamp 1 of dust air chamber 16, photoelectricity harvester 401, mini-fan 17, guiding device 402 are positioned at shell 18, guiding device 402 and mini-fan 17 lay respectively at the two ends of dust air chamber 16, laser lamp 1 is positioned at a side with guiding device 402, can send emergent light perpendicular to mini-fan 17, the outside that photoelectricity harvester 401 is positioned at dust air chamber 16 communicates with dust air chamber 16, and is positioned at the middle front part of dust air chamber 16.
After mini-fan 17 starts, dust laden air is sucked into dust air chamber 16 by guiding device 402, laser lamp 1 sends the emergent light perpendicular to mini-fan 17, because the dust laden air in the dust air chamber 16 has dust, scattering takes place in the emergent light that laser lamp 1 sends in dust air chamber 16, photoelectricity harvester 401 collection of scattered light, and scattered light is converted into voltage signal output.
In Fig. 4, photoelectricity harvester 401 can comprise with lower member: photoelectricity bar 8, photoelectricity base 9, photoelectricity prolong pipe 10, collector lens 7 and photodiode circuit plate 6.Photoelectricity prolongs the side that pipe 10 is installed in dust air chamber 16, is used to increase other parts of photoelectricity harvester 401, to avoid other parts contact dust.Photoelectricity base 9 is installed in photoelectricity and prolongs above the pipe 10, is used to place collector lens 7.Photoelectricity bar 8 is positioned on the photoelectricity base 9, is used to install photodiode circuit plate 6.Photodiode circuit plate 6 is installed on the photoelectricity bar 8, is used for scattered light is converted to electric signal.Collector lens 7 is used to increase the photosensitive area of photodiode on the photodiode circuit plate 6 between photoelectricity bar 8 and photoelectricity base 9.It is pointed out that the required operating voltage of photodiode that the embodiment of the invention adopts only is 3v to 5v.
Guiding device 402 among Fig. 4 can comprise with lower member: sharp mouth 11, collection end cap 12, light trap 13, loudspeaker mouth 14.Point mouth 11 is positioned at sensor of dust concentration foremost, is installed in and gathers on the end cap 12, is used to suck dust laden air.Gather end cap 12 and be installed on the loudspeaker mouth 14, be used to connect sharp mouth 11 and loudspeaker mouth 14.Loudspeaker mouth 14 is installed in an end of dust air chamber 16, and wide notch portion is stretched out from shell 18, is used for dust laden air is sent into dust air chamber 16.Light trap 13 is installed in loudspeaker mouth 14 inside, and is parallel to collection end cap 12, be used to stop that extraneous light enters dust air chamber 16, and light trap 13 also is used for the base as laser lamp 1.At least one air admission hole is arranged on the light trap 13, and these air admission holes are used to make the dust laden airs in the loudspeaker mouth 14 to enter air chamber, it is pointed out that the position of air admission hole on light trap 13 will avoid extraneous light to enter dust air chamber 16.
Laser lamp 1 is installed on the light trap 13, is used for sending the emergent light of directive mini-fan 17 when dust air chamber 16 enters dust laden air.Alternatively, laser lampshade 15 is wrapped in the periphery of laser lamp, is used for fixing laser lamp 15.
Preferably, dust air chamber 16 adopts the straight barrel type structure, has reduced the negative pressure pressure drop of air-flow to greatest extent, and then has reduced the requirement to mini-fan 17.And dust air chamber 16 inwalls are black, and the inwall of black can absorb the light that laser lamp 1 sends, and avoids reflected light, and the light that photoelectricity harvester 401 is gathered is the scattered light of dust, improves measuring accuracy.
In addition, also comprise among Fig. 4:
O type circle 2 is used for sealing and gathers end cap 12 and loudspeaker mouth 14;
Rubber washer 3 is used to seal loudspeaker mouth 14 and shell 18;
Nut 4 and bolt 5 are used to be used with fixedly loudspeaker mouth 14 and shell 18.
The sensor of dust concentration that the embodiment of the invention provides has following beneficial effect:
(1) operating voltage is that the photodiode of 3v to 5v has been eliminated potential safety hazard, and is difficult for brokenly, cheap, has reduced the cost of sensor of dust concentration;
(2) the suitable range of sensor of dust concentration configuration that can provide for the embodiment of the invention of the enlargement factor by changing programmable amplifying circuit, and the sensor of dust concentration that the embodiment of the invention provides has bigger measurement range, specifically can be: 0mg/m
3～1000mg/m
3
(3) compatible strong, the sensor of dust concentration that can utilize the general communications protocol of various mine supervision systems that the embodiment of the invention is provided by the RS485 IO interface inserts various mine supervision system;
(4) electric current and the voltage of the sensor of dust concentration that provides by the strictness control embodiment of the invention make it can be applied to contain under the mine of gas or coal dust explosion hazard;
(5) owing to used straight barrel type structure dust air chamber, the sensor of dust concentration inside that the embodiment of the invention provides is difficult for laying dust;
(6) user can dismantle mini-fan 17 voluntarily, and is easy to use;
(7) all parts of the sensor of dust concentration that provides of the embodiment of the invention are through accurate Calculation, compact conformation.
Please refer to Fig. 5, a kind of measuring method process flow diagram for the embodiment of the invention four provides can may further comprise the steps:
Step 501: start blower fan and make air chamber produce negative pressure;
Step 502: under the effect of negative pressure, dust laden air is sucked air chamber by guiding device;
Step 503: the dust laden air in the light source irradiation air chamber, to produce scattered light;
Step 504: photodiode is converted into voltage signal and output with scattered light;
Step 505: single-chip microcomputer is according to the voltage signal of photodiode output and voltage signal that prestores and dust concentration proportionate relationship calculating dust concentration.
As can be seen, sensor of dust concentration during operation, carry out opto-electronic conversion by photodiode, because photodiode can obtain bigger voltage by increasing negative feedback resistor, and then obtain the multiplication effect, therefore, the sensor of dust concentration that the embodiment of the invention provides is during opto-electronic conversion, need not again to it provides high pressure, thereby eliminated potential safety hazard.
Please refer to Fig. 6, the another kind of measuring method process flow diagram that provides for the embodiment of the invention five, be with the difference of step shown in Figure 5: receive the voltage signal that photodiode is exported by programmable amplifying circuit, voltage signal is amplified, export to single-chip microcomputer again.Fig. 6 can may further comprise the steps:
Step 601: start blower fan and make air chamber produce negative pressure;
Step 602: under the effect of negative pressure, dust laden air is sucked air chamber by guiding device;
Step 603: the dust laden air in the light source irradiation air chamber, to produce scattered light;
Step 604: photodiode is converted into voltage signal and output with scattered light;
Step 605: programmable amplifying circuit receives the voltage signal of photodiode output, and this voltage signal is amplified;
Step 606: programmable amplifying circuit is exported to single-chip microcomputer with the voltage signal that amplifies;
Step 607: single-chip microcomputer is according to the voltage signal of the amplification that receives and voltage signal that prestores and dust concentration proportionate relationship calculating dust concentration.
Preferably, air chamber can adopt the straight barrel type structure, and the air chamber inwall can be a black.
At last, also need to prove, in this article, relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint and have the relation of any this reality or in proper order between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Do not having under the situation of more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform, can certainly all implement, but the former is better embodiment under a lot of situation by hardware.Based on such understanding, all or part of can the embodying that technical scheme of the present invention contributes to background technology with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
More than the present invention is described in detail, used specific case herein principle of the present invention and embodiment set forth, the explanation of above embodiment just is used for help understanding method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (14)
1, a kind of sensor of dust concentration is characterized in that, described sensor of dust concentration comprises:
Blower fan, guiding device, air chamber, light source, photodiode and single-chip microcomputer;
Described blower fan makes described air chamber produce negative pressure;
Described guiding device when described air chamber produces negative pressure, sucks described air chamber with dust laden air;
Described light source is for the dust of dust laden air in the described air chamber provides illumination, to produce scattered light;
Described photodiode is converted into voltage signal with described scattered light, and exports described voltage signal;
Described single-chip microcomputer is according to the voltage signal of described photodiode output and voltage signal that prestores and dust concentration proportionate relationship calculating dust concentration.
2, sensor of dust concentration according to claim 1 is characterized in that, described sensor of dust concentration also comprises:
Photoelectricity prolongs pipe, increases described photodiode, contacts described dust to avoid described photodiode.
3, sensor of dust concentration according to claim 1 is characterized in that, described sensor of dust concentration also comprises:
The photoelectricity base is placed collector lens;
Described collector lens increases the photosensitive area of described photodiode.
4, sensor of dust concentration according to claim 1 is characterized in that, described guiding device comprises:
The point mouth sucks described dust laden air;
The loudspeaker mouth, described dust laden air is sent into described air chamber;
Gather end cap, connect described sharp mouth and described loudspeaker mouth;
Light trap with at least one air admission hole stops that extraneous light enters described air chamber, and described dust laden air is passed through.
5, sensor of dust concentration according to claim 1 is characterized in that, described sensor of dust concentration also comprises:
Light source lampshade, fixing described light source.
6, sensor of dust concentration according to claim 1 is characterized in that, described air chamber adopts the straight barrel type structure, to reduce the negative pressure pressure drop in the described air chamber.
7, sensor of dust concentration according to claim 1 is characterized in that, described air chamber inwall is a black, produces reflected light to avoid described air chamber inwall.
8, sensor of dust concentration according to claim 1 is characterized in that, described sensor of dust concentration also comprises:
Alarm unit, the dust concentration of measuring when described sensor of dust concentration give the alarm during greater than prevalue.
9, sensor of dust concentration according to claim 1 is characterized in that, described sensor of dust concentration also comprises:
The RS485 IO interface makes described sensor of dust concentration insert various mine supervision system.
10, sensor of dust concentration according to claim 1 is characterized in that, described sensor of dust concentration also comprises:
Frequency Output Interface Circuit makes described sensor of dust concentration insert various mine supervision system by frequency signal.
11, sensor of dust concentration according to claim 1 is characterized in that, described sensor of dust concentration also comprises:
The infrared remote control input block receives the instruction of telepilot, makes described single-chip microcomputer according to described instruction executable operations.
12, sensor of dust concentration according to claim 1 is characterized in that, described sensor of dust concentration also comprises:
Programmable amplifying circuit amplify the voltage signal of described photodiode output, and the voltage signal after will amplifying is exported to single-chip microcomputer;
Described single-chip microcomputer is according to the voltage signal after amplifying and voltage signal that prestores and dust concentration proportionate relationship calculating dust concentration.
13, a kind of sensor of dust concentration is measured the method for dust concentration, it is characterized in that described method comprises:
Starting blower fan makes air chamber produce negative pressure;
Under the effect of described negative pressure, dust laden air is sucked described air chamber by guiding device;
Dust laden air in the described air chamber of light source irradiation is to produce scattered light;
Photodiode is converted into voltage signal and output with described scattered light;
Single-chip microcomputer is according to the voltage signal of described photodiode output and voltage signal that prestores and dust concentration proportionate relationship calculating dust concentration.
14, method according to claim 13 is characterized in that, described scattered light is converted into voltage signal with described photodiode and output comprises:
Photodiode is converted into voltage signal with described scattered light, and described voltage signal is exported to programmable amplifying circuit, so that described programmable amplifying circuit amplifies described voltage signal;
Described single-chip microcomputer comprises with dust concentration proportionate relationship calculating dust concentration according to the voltage signal of described photodiode output and the voltage signal that prestores:
Described single-chip microcomputer calculates dust concentration according to the voltage signal that has amplified and the voltage signal that prestores and dust concentration proportionate relationship.
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| CN101968426A (en) * | 2010-09-27 | 2011-02-09 | 常熟市矿山机电器材有限公司 | Dust concentration sensor |
| CN102062706A (en) * | 2010-12-22 | 2011-05-18 | 北京大学 | Passive sampling device for atmospheric particulates |
| CN102353622A (en) * | 2011-07-01 | 2012-02-15 | 黑龙江科技学院 | Monitoring and measuring method for dust concentration in working faces in underground coal mine |
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| CN101968426A (en) * | 2010-09-27 | 2011-02-09 | 常熟市矿山机电器材有限公司 | Dust concentration sensor |
| CN102062706A (en) * | 2010-12-22 | 2011-05-18 | 北京大学 | Passive sampling device for atmospheric particulates |
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