CN102331395A - Laser sensor and airborne particle counter with laser sensor - Google Patents
Laser sensor and airborne particle counter with laser sensor Download PDFInfo
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- CN102331395A CN102331395A CN2010102243936A CN201010224393A CN102331395A CN 102331395 A CN102331395 A CN 102331395A CN 2010102243936 A CN2010102243936 A CN 2010102243936A CN 201010224393 A CN201010224393 A CN 201010224393A CN 102331395 A CN102331395 A CN 102331395A
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- photosensitive area
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Abstract
The invention discloses a laser sensor and an airborne particle counter with the laser sensor. The laser sensor which comprises a semiconductor laser which is used as a laser light source is characterized in that: a slit diaphragm which is arranged under the irradiation of the laser light source allows the laser light source to form a photosensitive area; a photoelectric receiver is arranged in the photosensitive area at a vertical direction; a suction nozzle and a venting nozzle which is symmetric with the suction nozzle are arranged in the photosensitive area at the vertical direction; and the suction nozzle comprises an internal sampling tube for conveying a sampling gas and an external protection tube which is arranged on the outboard of the internal sampling tube and is used for providing the protection gas. By adopting the airborne particle counter, large granular airborne particles with the diameter of over 10mum in air can be accurately detected.
Description
Technical field
The present invention relates to bulky grain dust granules pick-up unit, be specifically related to a kind of laser sensor and use the airborne particle counter of this laser sensor.
Background technology
Current, the application of airborne particle counter has spreaded all over multiple fields such as pharmacy, electronics, health care, optics and surface spraying, can detect the bulky grain dust amount in a certain ambient zone through airborne particle counter.
Wherein, laser sensor is a critical elements in the airborne particle counter, in order to detect the size and the quantity of dust granules.Laser sensor of the prior art is and detects diameter is the particle of 0.3-10 μ m, when particle diameter surpasses 10 μ m, can have following situation:
Because the deadweight of particle is relatively large, can cause particles settling in optical cavity, can not be detected;
Relatively large because of volume when particle passes through light sensitive area, make that the scattered light pulse width is excessive, be prone to thought a plurality of particles by mistake;
Relatively large because of the scattered light amplitude, be prone to by by and cause miscount;
Because of bulky grain Electrostatic Absorption power or surface adhesion force are stronger relatively, be prone to be adsorbed in pipeline or the cavity.
Like above-mentioned situation, when airborne particle diameter surpasses 10 μ m, just laser sensor can not accurately and comprehensively detect airborne dust particle.
Summary of the invention
For solving the problems of the technologies described above, we have proposed a kind of laser sensor and have used the airborne particle counter of this laser sensor, to realize and can carry out accurately and comprehensively detecting to the dust granules of diameter in the air above 10 μ m.
For achieving the above object, technical scheme of the present invention is following:
A kind of laser sensor comprises the semiconductor laser that is used for as LASER Light Source, and the direction of illumination of said LASER Light Source is provided with a slit light hurdle, makes said LASER Light Source form a photosensitive area through said slit light hurdle; The vertical direction of said photosensitive area is provided with photelectric receiver; On the vertical direction of said photosensitive area, also be provided with admission piece and be symmetrical in the outlet nozzle of said photosensitive area; Said admission piece comprises and is used to carry the inside sampling pipe of sample gas and places the said inner sampling pipe outside, be used to provide the outer protection pipe of blanket gas.
Preferably, irradiation place of the said LASER Light Source in said edge, slit light hurdle also is provided with cylindricality light hurdle.
Preferably, irradiation place along said LASER Light Source also is provided with the delustring device on said cylindricality light hurdle.
Preferably, said delustring device is the delustring cavity with cattle horn shape.
Preferably, said blanket gas is a pure air.
Preferably, said admission piece and outlet nozzle are to have the excessive flat valve of level.
A kind of airborne particle counter comprises the described laser sensor of claim 1-5, also comprises the filtration unit and the photoelectric conversion device that are connected with said laser sensor, and the signal processing apparatus that is connected with said photoelectric conversion device.
Preferably, also comprise the display device that is used to show testing result.
Preferably, said filtration unit comprises high efficiency particulate air filter.
Through technique scheme, the present invention adopts slit light hurdle to make LASER Light Source form narrow flat photosensitive area, makes that oarse-grained scattered light signal narrows down in the dust particle; Differentiated by photelectric receiver easily, improved the accuracy that detects the bulky grain dust particle, simultaneously; Admission piece is set to double-decker, and the skin of sample gas is surrounded by pure air, is that the bulky grain in the sample gas can sedimentation; Can not be adsorbed yet, further improve the accuracy that detects the bulky grain dust particle.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the disclosed a kind of laser sensor of the embodiment of the invention;
Fig. 2 is the connection synoptic diagram of the disclosed airborne particle counter of the embodiment of the invention.
Embodiment
The invention provides a kind of laser sensor and use the airborne particle counter of this laser sensor, to realize to detect exactly the bulky grain dust particle that diameter in the air surpasses 10 μ m.
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Referring to Fig. 1, be the structural representation of a kind of laser sensor that the embodiment of the invention provided.Comprise semiconductor laser instrument 11, be used for as LASER Light Source.The direction of illumination of LASER Light Source is provided with slit light hurdle 12; Make the hot spot of said LASER Light Source become narrow flat; Form the photosensitive area 18 of narrow flat; When the scattered light signal of bulky grain dust particle got into said photosensitive area 18, scattered light signal narrowed down, thereby said scattered light signal can be differentiated by photelectric receiver 17.
In 12 irradiations place of slit light hurdle, be provided with cylindricality light hurdle 13, before photelectric receiver 17 receiving optical signals along LASER Light Source; Carry out delustring through the 13 pairs of light path part in cylindricality light hurdle and handle, cylindricality light hurdle 13 roughly is horn-like, and front end has less angle; Both can prevent the generation of parasitic light; The parasitic light that can eliminate on the light path is arranged, thereby can reduce optical noise, improve signal to noise ratio (S/N ratio).
Cylindricality light hurdle 13 also is provided with cattle horn shape delustring cavity 14 along laser light hurdle irradiation place, and said laser beam directly gets into cattle horn shape delustring cavity 14 after through the photosensitive area, and is absorbed.
On the vertical direction of photosensitive area; Be respectively arranged with admission piece 15 and outlet nozzle 16; Two valves 15 and 16 pairs are lining in the photosensitive area and distribute, and have the excessive flat pattern of level, and this shape can reduce the diffusion of air-flow in the photosensitive area; Thereby reduce the probability that particle appears at low light level district, can improve the particle resolution of optical sensor.
Wherein, admission piece 15 comprises and is used to carry the inside sampling pipe 151 of sample gas and places said inner sampling pipe 151 outsides, be used to provide the outer protection pipe 152 of blanket gas.When sampled air during in internal flow, the outside has blanket gas that sample gas is flowed along fixed track, can prevent that big dust granules can sedimentation, also can not be adsorbed, and has further improved the accuracy rate that detects.Said blanket gas can be clean gas, also can for other can be as the gas of protective seam.
The present invention also provides a kind of airborne particle counter of using this laser sensor.Referring to connection synoptic diagram shown in Figure 2, comprise laser sensor 21, photoelectric conversion device 22, signal processing apparatus 23 and display device 24.The admission piece of laser sensor 21 and outlet nozzle place are connected with high efficiency particulate air filter 25 respectively, and link to each other through vacuum pump body 26, between high efficiency particulate air filter 25 and vacuum pump body 26, are provided with gas flow regulating valve 27, are used to control the flow of internal gas.When said sampled air is passed through laser sensor 21; Can obtain the scattered light pulse signal through laser sensor 21; Photoelectric conversion device 22 converts said scattered light pulse signal into digital signal then; By signal processing apparatus 23 said digital signal is handled and record again, shown through display device 24 at last.Concrete; Said photoelectric conversion device 22 can adopt the digital-to-analogue treatment circuit of wide cut reaction, and said signal processing apparatus 23 can be designed to the high-speed record circuit, and said display device 24 can be a display screen; Said each device is not limited to other structure, and the present invention does not do qualification.
The embodiment of the invention provides a kind of laser sensor and a kind of airborne particle counter of using this laser sensor.The present invention makes LASER Light Source form narrow flat photosensitive area through slit light hurdle, makes that oarse-grained scattered light signal narrows down in the dust particle, is differentiated by photelectric receiver easily; Improved the accuracy that detects the bulky grain dust particle, simultaneously, admission piece is set to double-decker; The skin of sample gas is surrounded by pure air; Be that bulky grain in the sample gas can sedimentation, also can be adsorbed, further improved the accuracy that detects the bulky grain dust particle.Can realize detecting exactly the bulky grain dust particle that diameter in the air surpasses 10 μ m through the present invention.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (9)
1. a laser sensor is characterized in that, comprises the semiconductor laser that is used for as LASER Light Source, and the direction of illumination of said LASER Light Source is provided with a slit light hurdle, makes said LASER Light Source form the photosensitive area through said slit light hurdle; The vertical direction of said photosensitive area is provided with photelectric receiver; On the vertical direction of said photosensitive area, also be provided with admission piece and be symmetrical in the outlet nozzle of said photosensitive area; Said admission piece comprises and is used to carry the inside sampling pipe of sample gas and places the said inner sampling pipe outside, be used to provide the outer protection pipe of blanket gas.
2. laser sensor according to claim 1 is characterized in that, said slit light hurdle also is provided with cylindricality light hurdle along irradiation place of said LASER Light Source.
3. laser sensor according to claim 1 is characterized in that, irradiation place on said cylindricality light hurdle along said LASER Light Source also is provided with the delustring device.
4. laser sensor according to claim 3 is characterized in that, said delustring device is the delustring cavity with cattle horn shape.
5. laser sensor according to claim 1 is characterized in that, said blanket gas is a pure air.
6. laser sensor according to claim 1 is characterized in that, said admission piece and outlet nozzle are to have the excessive flat valve of level.
7. airborne particle counter; It is characterized in that; Comprise the described laser sensor of claim 1-5, also comprise the filtration unit and the photoelectric conversion device that are connected with said laser sensor, and the signal processing apparatus that is connected with said photoelectric conversion device.
8. airborne particle counter according to claim 6 is characterized in that, also comprises the display device that is used to show testing result.
9. airborne particle counter according to claim 6 is characterized in that said filtration unit comprises high efficiency particulate air filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102243936A CN102331395A (en) | 2010-07-13 | 2010-07-13 | Laser sensor and airborne particle counter with laser sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102243936A CN102331395A (en) | 2010-07-13 | 2010-07-13 | Laser sensor and airborne particle counter with laser sensor |
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| CN102331395A true CN102331395A (en) | 2012-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010102243936A Pending CN102331395A (en) | 2010-07-13 | 2010-07-13 | Laser sensor and airborne particle counter with laser sensor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163073A (en) * | 2013-03-08 | 2013-06-19 | 苏州市尚科产品检测中心 | Flat valve |
| CN106932320A (en) * | 2016-10-28 | 2017-07-07 | 杭州克霾环保科技有限公司 | Particulate matter detector |
| CN107735667A (en) * | 2015-06-12 | 2018-02-23 | 皇家飞利浦有限公司 | Optical particulate sensor and method for sensing |
| CN111307677A (en) * | 2019-11-22 | 2020-06-19 | 北京雪迪龙科技股份有限公司 | Laser front scattering particulate matter monitoring device |
| CN112014284A (en) * | 2020-08-27 | 2020-12-01 | 苏州亿利安机电科技有限公司 | Direct-reading dust concentration measuring instrument |
| CN113433046A (en) * | 2021-06-23 | 2021-09-24 | 江苏铁军软件科技有限公司 | Raise dust detecting system for job site |
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| CN2145380Y (en) * | 1992-12-30 | 1993-11-03 | 华东工学院 | Optical sensor for dust particle counter |
| CN2316653Y (en) * | 1997-10-17 | 1999-04-28 | 苏州苏净集团公司 | Miniature optical sensor for laser dust particle counter |
| CN201130141Y (en) * | 2007-12-26 | 2008-10-08 | 南京理工大学 | Optical sensor for dust particle counter |
| CN101470066A (en) * | 2007-12-26 | 2009-07-01 | 南京理工大学 | Optical sensor for high-flux dust particle counter |
| CN201780252U (en) * | 2010-07-13 | 2011-03-30 | 苏州工业园区鸿基洁净科技有限公司 | Laser sensor and dust particle counter applying same |
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2010
- 2010-07-13 CN CN2010102243936A patent/CN102331395A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2145380Y (en) * | 1992-12-30 | 1993-11-03 | 华东工学院 | Optical sensor for dust particle counter |
| CN2316653Y (en) * | 1997-10-17 | 1999-04-28 | 苏州苏净集团公司 | Miniature optical sensor for laser dust particle counter |
| CN201130141Y (en) * | 2007-12-26 | 2008-10-08 | 南京理工大学 | Optical sensor for dust particle counter |
| CN101470066A (en) * | 2007-12-26 | 2009-07-01 | 南京理工大学 | Optical sensor for high-flux dust particle counter |
| CN201780252U (en) * | 2010-07-13 | 2011-03-30 | 苏州工业园区鸿基洁净科技有限公司 | Laser sensor and dust particle counter applying same |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163073A (en) * | 2013-03-08 | 2013-06-19 | 苏州市尚科产品检测中心 | Flat valve |
| CN107735667A (en) * | 2015-06-12 | 2018-02-23 | 皇家飞利浦有限公司 | Optical particulate sensor and method for sensing |
| CN107735667B (en) * | 2015-06-12 | 2021-06-15 | 皇家飞利浦有限公司 | Optical particle sensor and sensing method |
| CN106932320A (en) * | 2016-10-28 | 2017-07-07 | 杭州克霾环保科技有限公司 | Particulate matter detector |
| CN111307677A (en) * | 2019-11-22 | 2020-06-19 | 北京雪迪龙科技股份有限公司 | Laser front scattering particulate matter monitoring device |
| CN112014284A (en) * | 2020-08-27 | 2020-12-01 | 苏州亿利安机电科技有限公司 | Direct-reading dust concentration measuring instrument |
| CN112014284B (en) * | 2020-08-27 | 2023-11-24 | 苏州亿利安机电科技有限公司 | Direct-reading dust concentration measuring instrument |
| CN113433046A (en) * | 2021-06-23 | 2021-09-24 | 江苏铁军软件科技有限公司 | Raise dust detecting system for job site |
| CN113433046B (en) * | 2021-06-23 | 2022-03-08 | 江苏铁军软件科技有限公司 | Raise dust detecting system for job site |
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Application publication date: 20120125 |