CN104075967A - Particle counter - Google Patents
Particle counter Download PDFInfo
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- CN104075967A CN104075967A CN201410339882.4A CN201410339882A CN104075967A CN 104075967 A CN104075967 A CN 104075967A CN 201410339882 A CN201410339882 A CN 201410339882A CN 104075967 A CN104075967 A CN 104075967A
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- corpuscular counter
- back cover
- gas
- gas passage
- laser
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Abstract
The invention provides a particle counter, which is used for detecting and determining the quantity and the sizes of particles in a gas, and counts the particles through laser irradiation of the gas in a measuring zone according to the scattered light generated by the particles in the measuring zone. The particle counter comprises a housing, a gas passage, a laser transmitter and a photodetector, wherein the laser transmitter generates a laser beam; the laser beam and the gas passage are crossed to form a measuring zone; the photodetector is arranged below the measuring zone; the gas passage is arranged between a front housing and a rear housing and adopts a top-down penetrating structure; a gas to be tested can directly enter the particle counter from the top end of the rear housing.
Description
Technical field
The testing tool that the present invention relates to contained airborne in a kind of measurement gas, relates in particular to a kind of by the corpuscular counter that in gas, dust particle scattered light is measured.
Background technology
At present the cardinal principle of airborne particle counter is, the light scattering phenomenon that utilizes dust particle to produce in light beam is measured the scattered light intensity that dust particle produces and known the concentration of dust particle contained in the size of particle and air by inference.
In the prior art, airborne particle counter is mainly comprised of illuminator, scattered light collection system, photoelectric commutator, air-channel system etc.Wherein, the axes intersect of scattered light collection system and air-channel system is in photaesthesia central point, during work, air-channel system is by the light sensitive area in tested air intake corpuscular counter, and wherein dust particle produces scattered signal proportional to particle size under light beam irradiates.Scattered light signal is scattered after light collecting system receives and is incident on photoelectric commutator, the electric signal that photoelectric commutator output is directly proportional to scattered light intensity, follow-up signal disposal system provides the concentration of dust particle in particle size and air according to the amplitude of this electric signal.
But, because the scattered light signal of dust particle is extremely faint, thus do not allow veiling glare to enter photoelectric commutator, otherwise measurement result will be incredible.In order to guarantee measuring accuracy, it is very complicated that the shell of described corpuscular counter often arranges.For example, the air intake vent of air-channel system is arranged on the back side of shell, can be so that gas to be measured carries out the deflection of 90 degree, so that Gas Stirring to be measured is more even.But air intake vent is arranged on the complexity that the structure at the shell back side has not only increased corpuscular counter shell, and make shell have very serious light leakage phenomena.
Summary of the invention
In order to overcome existing technical matters, the object of the present invention is to provide a kind of features simple structure, be difficult for the corpuscular counter of light leak.
To achieve these goals, the invention provides a kind of corpuscular counter, this corpuscular counter is for number of particles and the particle size surveyed and definite gas is contained, this corpuscular counter is by measuring the gas irradiating laser in region, and according to this mensuration region memory the scattered light that produces of particle particle is counted.This corpuscular counter comprises housing, gas passage, generating laser and OPTICAL SENSORS, described housing comprises fore shell and back cover, described fore shell and back cover fasten mutually, the top of described back cover is provided with air intake vent, the bottom of described back cover is provided with air outlet, and described gas to be measured is by described this corpuscular counter of air intake vent suction; Gas passage is arranged between described fore shell and described back cover, and described gas passage is communicated with described air intake vent and described air outlet; Generating laser is arranged at described enclosure interior, and this generating laser produces laser beam, and described laser beam and described gas passage intersect to form mutually measures region; OPTICAL SENSORS be arranged at described mensuration region below, described OPTICAL SENSORS is directly collected the scattered light that the particle of gas existence in described mensuration region produces; Wherein, described gas passage is the top-down structure that runs through, and gas to be measured can directly enter in this corpuscular counter from the top of described back cover.
Preferably, in described corpuscular counter, described gas passage is provided with the first light barrier near one end of air intake vent, and described gas to be measured is entered by air intake vent and encounters described the first light barrier.
Preferably, in described corpuscular counter, described gas passage also has the second light barrier, and described the second light barrier is adjacent with described the first tabula rasa, and forms funnel shaped the first nozzle with the end of described the first light barrier.
Preferably, in described corpuscular counter, also have outstanding second nozzle downwards on described the second light barrier, described second nozzle is near described mensuration region.
Preferably, in described corpuscular counter, the bottom of described back cover is also provided with negative-pressure air fan, and described negative-pressure air fan is twitched flowing of gas to be measured in described gas passage.
Preferably, in described corpuscular counter, described laser beam is focused beam, and the focus point of described focused beam is positioned at described mensuration region.
Preferably, in described corpuscular counter, described generating laser also comprises for the laser bench of fixed laser transmitter with for cutting the catch of light beam.
Preferably, in described corpuscular counter, in described back cover, a side relative with described generating laser is provided with light absorption department.
Preferably, in described corpuscular counter, described light absorption department is trapezium structure, and the size of described trapezium structure is along changing to greatly from little in described laser beam working direction.
Preferably, in described corpuscular counter, described OPTICAL SENSORS comprises photodiode.
Compared with prior art, described gas passage is the top-down structure that runs through, thereby gas to be measured can directly be entered in this corpuscular counter from the top of described back cover, and the laser beam that described generating laser sends is horizontal direction, thereby the laser beam that advances of horizontal direction can not produce light leak from running through up and down in the gas passage of structure.In addition, described air intake vent is arranged at the top of described back cover, thereby makes the structure of described back cover more succinct, has avoided the outstanding air intake vent structure of described back cover.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 is the structural representation of the present invention's one specific embodiment;
Fig. 2 is the present invention's one specific embodiment fore shell and back cover isolating construction schematic diagram;
Fig. 3 is the side cutaway view of the present invention's one specific embodiment;
Fig. 4 is the gas passage circulation schematic diagram on the present invention's one specific embodiment back cover;
Fig. 5 is the present invention's one specific embodiment gas passage enlarged diagram;
Fig. 6 is the present invention's one specific embodiment particle scattering schematic diagram.
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 clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
For making that object of the present invention, structure, feature and function thereof are had to further understanding, hereby coordinate embodiment to be described in detail as follows.
Shown in Fig. 1, Fig. 2 and Fig. 3, wherein Figure 1 shows that the schematic diagram of the present invention's one specific embodiment corpuscular counter 1; Figure 2 shows that the fore shell 20 and the separated schematic diagram of back cover 10 of the present invention's one specific embodiment corpuscular counter 1; Fig. 3 is the side sectional view of the present invention's one specific embodiment corpuscular counter 1.This corpuscular counter 1 comprises fore shell 20, back cover 10, gas passage 30, generating laser 22 and OPTICAL SENSORS 23.Described fore shell 20 and described back cover 10 fasten mutually, to form airtight gas passage 30 between fore shell and back cover, avoid the interference of the internal portion of extraneous light OPTICAL SENSORS 23.In addition, described fore shell 20 and described back cover also can be set to double-layer structure, further increase the leakproofness that both fasten.
As shown in Figure 2, the top of this corpuscular counter 1 back cover 10 is provided with air intake vent 11, and this air intake vent 11 can make outside air be drawn in corpuscular counter.And in the prior art, the air intake vent of corpuscular counter is generally all arranged on the back side of back cover, be so just easy to make corpuscular counter to produce light leakage phenomena by back side air intake vent.And the air intake vent of corpuscular counter 1 of the present invention is arranged on the top of back cover 10, thereby avoided the light leakage phenomena of corpuscular counter 1 at air intake vent 1.
In addition, air intake vent 1 is arranged at the top of back cover 10, has reduced the structure space of corpuscular counter 1.Reduce back cover 10 back projections, and be convenient to the circulation of air.Also make the manufacturing process of back cover 10 more succinct, reduced the die sinking expense of back cover 10, thereby reduced the manufacturing cost of corpuscular counter 1.
The bottom of this corpuscular counter 1 back cover 10 is provided with air outlet 12.As shown in Figure 3, the bottom of described back cover 10 is also provided with negative-pressure air fan 13, and this negative-pressure air fan 13 can be extracted the air in corpuscular counter 1 out by air outlet 12.Thereby make the interior Air Flow of this corpuscular counter 1 (in Fig. 3, the direction of arrow is the direction of Air Flow in corpuscular counter).
As shown in Figures 2 and 3, on described fore shell 20, be also provided with circuit board 21, on this circuit board 21, be provided with the required various essential electronic devices and components of this corpuscular counter, for example, signal amplifier part etc.In addition, this circuit board 21 fastening relative to gas passage 30 on back cover 10, has further increased the leakproofness of gas passage 30.Described generating laser 22 and described OPTICAL SENSORS 23 are arranged on described circuit board 21.Further, described generating laser 22 is arranged at described OPTICAL SENSORS 23 back side that described circuit board 21 is relative with described back cover 10.Wherein, described generating laser 22 also comprises for the laser bench of fixed laser transmitter with for cutting the catch (not shown in FIG.) of light beam.Described laser bench is for being fixed on described circuit board 21 by described generating laser 22.Described catch cuts for the laser beam that described generating laser is produced, thereby makes laser beam meticulousr accurately.Preferably, in the present embodiment, described laser beam is focused beam, and the focus point of described focused beam is positioned at described mensuration region.Due to the focus point of the laser beam top in OPTICAL SENSORS 23 just, thereby make air sample collection more accurate.Wherein, described mensuration region is this laser beam and the mutual infall of described gas passage 30.Described OPTICAL SENSORS 23 be positioned at described mensuration region below, preferably, described OPTICAL SENSORS 23 is photodiode.This OPTICAL SENSORS 23 is directly collected the scattered light that in described mensuration region, in air, dust particle produces.
Shown in Fig. 6, Fig. 6 is the present invention's one specific embodiment air particles scattering schematic diagram.The basic functional principle of this corpuscular counter 1 is, the light scattering phenomenon producing under illumination by dust particle in air is measured the scattered light intensity that dust particle produces, and then knows the quantity of dust particle contained in the size of particle and air by inference.Shown in Fig. 3, first, external environment air is drawn in corpuscular counter 1 (in Fig. 3, the direction of arrow is circulation of air direction) by the air intake vent 11 of this corpuscular counter 1, this air to be measured flow to and measures region through the gas passage 30 on back cover 10, described generating laser 22 produces laser beam 24, laser beam 24 is irradiated to be measured on region, thereby make to measure dirt in air particle 25 in region, scattering occurs, the OPTICAL SENSORS 23 that is arranged at below, described mensuration region is collected the light of dust particle scattering.Wherein, dust particle 25 generation and the proportional scattered light signal of particle size and quantity under laser beam irradiation.The scattered light signal that follow-up this corpuscular counter 1 is collected according to OPTICAL SENSORS 23 can be extrapolated the quantity of contained dust particle in the size of dust particle in air and air.
For air in clearer description the present invention is in the interior circulation of corpuscular counter 1, shown in Fig. 3, Fig. 4 and Fig. 5.Fig. 4 is the signal of the gas passage 30 on the present invention's one specific embodiment back cover 10; Fig. 5 is the local enlarged diagram of the present invention's one specific embodiment gas passage 30.Described gas passage 30 also comprises the first light barrier 31, the first nozzle 32, the second light barrier 33, second nozzle 34 and the 3rd light barrier 35.Wherein, described the first light barrier 31, the second light barrier 33 and the 3rd light barrier 35 are casting on back cover 10 inwalls.Described gas passage 30 is the top-down structure that runs through, and outside air can directly enter in this corpuscular counter from the air intake vent 11 on described back cover 10 tops.By coordinating of the first light barrier 31, the second light barrier 33 and the 3rd light barrier 35 and the first nozzle 32 and second nozzle 34, make the air stirring in gas passage 30 more even, avoid the measured deviation of corpuscular counter.In addition, by the cooperation of blocking of the first light barrier 31, the second light barrier 33 and the 3rd light barrier 35, can effectively avoid extraneous light to disturb the light of particle counter measuring, can also effectively avoid the light leakage phenomena of corpuscular counter simultaneously.
Concrete, as shown in Figure 5, the first light barrier 31 is arranged at described gas passage 30 near 11 one end of air intake vent, outside air collides with described the first light barrier after being entered by air intake vent 11, and one end of described the first light barrier 31 has upwards protrusion (as shown in Figure 5), makes the air draught entering turn round to stir.Meanwhile, the first shadow shield 31 has also well played the effect that prevents that laser from leaking outside.
Along airflow direction down, described the second light barrier 33 is arranged at the below of described the first light barrier 31, and described the second light barrier 33 is adjacent with described the first tabula rasa 31, and forms funnel shaped the first nozzle 32 with the end of described the first light barrier 31.Described the second shadow shield 33 further makes air draught turn round for the second time stirring again, makes air draught more even.Avoid measuring fluctuation excessive.On described the second light barrier 33, also have outstanding second nozzle 34 downwards, described second nozzle 34 is near described mensuration region.
Shown in Fig. 6, the laser beam 24 that generating laser 22 produces focuses on described mensuration region, and described gas channel 30 intersects mutually simultaneously, and then realizes the sampled measurements to air draught.In described back cover 10, a side relative with described generating laser 22 is provided with light absorption department 36.This light absorption department 36 can absorb the laser beam through measuring region.Avoid laser beam to be reflected and cause interference to measuring.Described light absorption department 36 can surround by second nozzle 34 and the 3rd light barrier 35, and at the entrance of described light absorption department 36, a small lugs 37 is set, to avoid the laser of reflection to spill in light absorption department 36.Preferably, described light absorption department 36 is trapezium structure, and the size of described trapezium structure is along changing to greatly from little in described laser beam working direction.
Compared with prior art, described gas passage 30 is the top-down structure that runs through, thereby gas to be measured can directly be entered in this corpuscular counter 1 from the top of described back cover 10, and the laser beam 24 that described generating laser 22 sends is horizontal direction, thereby the laser beam that horizontal direction is advanced can be from not running through the interior generation light leak of gas passage 30 of structure up and down.In addition, described air intake vent 11 is arranged at the top of described back cover 10, thereby makes the structure of described back cover 11 more succinct, has reduced the structure space of corpuscular counter 1.Reduced back cover 10 back projections, made the manufacturing process of back cover 10 more succinct, reduced the die sinking expense of back cover 10, thereby reduced the manufacturing cost of corpuscular counter 1.
The present invention is described by above-mentioned related embodiment, yet above-described embodiment is only for implementing example of the present invention.Must be pointed out that, the embodiment having disclosed does not limit the scope of the invention.On the contrary, the change done without departing from the spirit and scope of the present invention and retouching, all belong to scope of patent protection of the present invention.
Claims (10)
1. a corpuscular counter, for number of particles and the particle size surveyed and definite gas is contained, this corpuscular counter is by the gas irradiating laser in mensuration region, and according to this mensuration region memory the scattered light that produces of particle particle is counted, it is characterized in that, this corpuscular counter comprises:
Housing, comprises fore shell and back cover, and described fore shell and back cover fasten mutually, and the top of described back cover is provided with air intake vent, and the bottom of described back cover is provided with air outlet, and gas to be measured is by described this corpuscular counter of air intake vent suction;
Gas passage, is arranged between described fore shell and described back cover, and described gas passage is communicated with described air intake vent and described air outlet;
Generating laser, is arranged at described enclosure interior, and this generating laser produces laser beam, and described laser beam and described gas passage intersect to form mutually measures region;
OPTICAL SENSORS, be arranged at described mensuration region below, described OPTICAL SENSORS is directly collected the scattered light that the particle of gas existence in described mensuration region produces;
Wherein, described gas passage is the top-down structure that runs through, and described gas to be measured can directly enter in this corpuscular counter from the top of described back cover.
2. corpuscular counter as claimed in claim 1, is characterized in that, described gas passage is provided with the first light barrier near one end of air intake vent, and described gas to be measured is entered by air intake vent and encounters described the first light barrier.
3. corpuscular counter as claimed in claim 2, is characterized in that, described gas passage also has the second light barrier, and described the second light barrier is adjacent with described the first tabula rasa, and forms funnel shaped the first nozzle with the end of described the first light barrier.
4. corpuscular counter as claimed in claim 3, is characterized in that, also has outstanding second nozzle downwards on described the second light barrier, and described second nozzle is near described mensuration region.
5. corpuscular counter as claimed in claim 1, is characterized in that, the bottom of described back cover is also provided with negative-pressure air fan, and described negative-pressure air fan is twitched flowing of gas to be measured in described gas passage.
6. corpuscular counter as claimed in claim 1, is characterized in that, described laser beam is focused beam, and the focus point of described focused beam is positioned at described mensuration region.
7. corpuscular counter as claimed in claim 1, is characterized in that, described generating laser also comprises for the laser bench of fixed laser transmitter with for cutting the catch of light beam.
8. corpuscular counter as claimed in claim 1, is characterized in that, in described back cover, a side relative with described generating laser is provided with light absorption department.
9. corpuscular counter as claimed in claim 8, is characterized in that, described light absorption department is trapezium structure, and the size of described trapezium structure is along changing to greatly from little in described laser beam working direction.
10. corpuscular counter as claimed in claim 1, is characterized in that, described OPTICAL SENSORS comprises photodiode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410339882.4A CN104075967A (en) | 2014-07-16 | 2014-07-16 | Particle counter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410339882.4A CN104075967A (en) | 2014-07-16 | 2014-07-16 | Particle counter |
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|---|---|
| CN104075967A true CN104075967A (en) | 2014-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410339882.4A Pending CN104075967A (en) | 2014-07-16 | 2014-07-16 | Particle counter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104677798A (en) * | 2015-03-30 | 2015-06-03 | 济南新活电器有限公司 | High-sensitivity air detector for acquiring signal by multi-grade laser net |
| CN105784552A (en) * | 2014-12-24 | 2016-07-20 | 周志斌 | Particle concentration sensor and particle concentration detection method |
| CN106990016A (en) * | 2017-04-21 | 2017-07-28 | 上海赛菲环境科技股份有限公司 | A kind of dust sensor |
| CN110082266A (en) * | 2018-01-26 | 2019-08-02 | 研能科技股份有限公司 | Gas-detecting device |
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| US4021792A (en) * | 1975-06-23 | 1977-05-03 | Wellen Industries | Smoke alarm |
| CN2583666Y (en) * | 2002-11-20 | 2003-10-29 | 上海理工大学 | Particle measuring device based on dynamic light dispersion signal fractal |
| CN2689219Y (en) * | 2004-04-05 | 2005-03-30 | 苏州市百神科技有限公司 | Optical sensor of manual laser dust particle counters |
| CN103575638A (en) * | 2013-07-26 | 2014-02-12 | 中国计量学院 | Light scattering type particle counter and particle size distribution algorithm thereof |
| CN203981544U (en) * | 2014-07-16 | 2014-12-03 | 苏州贝昂科技有限公司 | Corpuscular counter |
-
2014
- 2014-07-16 CN CN201410339882.4A patent/CN104075967A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4021792A (en) * | 1975-06-23 | 1977-05-03 | Wellen Industries | Smoke alarm |
| CN2583666Y (en) * | 2002-11-20 | 2003-10-29 | 上海理工大学 | Particle measuring device based on dynamic light dispersion signal fractal |
| CN2689219Y (en) * | 2004-04-05 | 2005-03-30 | 苏州市百神科技有限公司 | Optical sensor of manual laser dust particle counters |
| CN103575638A (en) * | 2013-07-26 | 2014-02-12 | 中国计量学院 | Light scattering type particle counter and particle size distribution algorithm thereof |
| CN203981544U (en) * | 2014-07-16 | 2014-12-03 | 苏州贝昂科技有限公司 | Corpuscular counter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784552A (en) * | 2014-12-24 | 2016-07-20 | 周志斌 | Particle concentration sensor and particle concentration detection method |
| CN105784552B (en) * | 2014-12-24 | 2019-08-06 | 周志斌 | Particle concentration detection method |
| CN104677798A (en) * | 2015-03-30 | 2015-06-03 | 济南新活电器有限公司 | High-sensitivity air detector for acquiring signal by multi-grade laser net |
| CN106990016A (en) * | 2017-04-21 | 2017-07-28 | 上海赛菲环境科技股份有限公司 | A kind of dust sensor |
| CN110082266A (en) * | 2018-01-26 | 2019-08-02 | 研能科技股份有限公司 | Gas-detecting device |
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Application publication date: 20141001 |