CN201780252U - Laser sensor and dust particle counter applying same - Google Patents
Laser sensor and dust particle counter applying same Download PDFInfo
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- CN201780252U CN201780252U CN2010202559633U CN201020255963U CN201780252U CN 201780252 U CN201780252 U CN 201780252U CN 2010202559633 U CN2010202559633 U CN 2010202559633U CN 201020255963 U CN201020255963 U CN 201020255963U CN 201780252 U CN201780252 U CN 201780252U
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- laser sensor
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- light source
- photosensitive area
- particle counter
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Abstract
The utility model discloses a laser sensor and a dust particle counter applying the same. The laser sensor comprises a semiconductor laser unit used as a laser light source; a slit diaphragm is arranged in the radiation direction of the laser light source; the laser light source forms a photosensitive area by the aid of the slit diaphragm; a photoelectric receiver, a gas inlet nozzle and a gas outlet nozzle are arranged in the perpendicular direction of the photosensitive area; the gas outlet nozzle is symmetric to the photosensitive area; and the gas inlet nozzle includes an internal sampling tube for conveying sample gas and an external protecting tube, wherein the external protecting tube placed on the outer side of the internal sampling tube is used for providing protecting gas. The laser sensor and the dust particle counter can realize accurate detection of large-grain dust particles with diameters larger than 10 micrometers in air.
Description
Technical field
The utility model relates to bulky grain dust granules pick-up unit, is specifically related to a kind of laser sensor and uses 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 bulky grain dust amount in a certain ambient zone by 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 can not be detected in optical cavity;
Relatively large because of volume when particle passes through light sensitive area, make that the scattered light pulse width is excessive, easily thought a plurality of particles by mistake;
Relatively large because of the scattered light amplitude, easily be cut off and cause miscount;
Because of bulky grain Electrostatic Absorption power or surface adhesion force are stronger relatively, easily be adsorbed in pipeline or the cavity.
As above-mentioned situation, when airborne particle diameter surpasses 10 μ m, just laser sensor can not accurately and comprehensively detect airborne dust particle.
The utility model content
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, the technical solution of the utility model is as follows:
A kind of laser sensor comprises the semiconductor laser that is used for as LASER Light Source, and the direction of illumination of described LASER Light Source is provided with a slit light hurdle, makes described LASER Light Source form a photosensitive area by described slit light hurdle; The vertical direction of described photosensitive area is provided with photelectric receiver; On the vertical direction of described photosensitive area, also be provided with admission piece and be symmetrical in the outlet nozzle of described photosensitive area; Described admission piece comprises and is used to carry the inside sampling pipe of sample gas and places the described inner sampling pipe outside, be used to provide the outer protection pipe of blanket gas.
Preferably, described slit light hurdle also is provided with cylindricality light hurdle along irradiation place of described LASER Light Source.
Preferably, irradiation place along described LASER Light Source also is provided with the delustring device on described cylindricality light hurdle.
Preferably, described delustring device is the delustring cavity with cattle horn shape.
Preferably, described blanket gas is a pure air.
Preferably, described 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 described laser sensor, and the signal processing apparatus that is connected with described photoelectric conversion device.
Preferably, also comprise the display device that is used to show testing result.
Preferably, described filtration unit comprises high efficiency particulate air filter.
Pass through technique scheme, the utility model adopts slit light hurdle to make LASER Light Source form narrow flat photosensitive area, make 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 utility model embodiment 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, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, 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 utility model embodiment;
Fig. 2 is the connection diagram of the disclosed airborne particle counter of the utility model embodiment.
Embodiment
The utility model provides a kind of laser sensor and has used the airborne particle counter of this laser sensor, to realize detecting exactly the bulky grain dust particle that diameter in the air surpasses 10 μ m.
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, 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 utility model protection.
Referring to Fig. 1, the structural representation of a kind of laser sensor that is provided for the utility model embodiment.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 described LASER Light Source become narrow flat, form the photosensitive area 18 of narrow flat, when the scattered light signal of bulky grain dust particle enters described photosensitive area 18, scattered light signal narrows down, thereby described scattered light signal can be differentiated by photelectric receiver 17.
In 12 irradiations place of slit light hurdle along LASER Light Source, be provided with cylindricality light hurdle 13, before photelectric receiver 17 receiving optical signals, carry out delustring by 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 described laser beam directly enters 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 has an excessive flat pattern of level, 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 described 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 fixing track, can prevent that big dust granules can sedimentation, also can not be adsorbed, and has further improved the accuracy rate that detects.Described blanket gas can be clean gas, also can for other can be as the gas of protective seam.
The utility model also provides a kind of airborne particle counter of using this laser sensor.Referring to connection 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 by vacuum pump body 26, are provided with gas flow regulating valve 27 between high efficiency particulate air filter 25 and vacuum pump body 26, are used to control the flow of internal gas.When described sampled air is passed through laser sensor 21, can obtain the scattered light pulse signal by laser sensor 21, photoelectric conversion device 22 is converted to digital signal with described scattered light pulse signal then, by signal processing apparatus 23 described digital signal is handled and record again, shown by display device 24 at last.Concrete, described photoelectric conversion device 22 can adopt the digital-to-analogue treatment circuit of wide cut reaction, and described signal processing apparatus 23 can be designed to the high-speed record circuit, and described display device 24 can be a display screen, described each device is not limited to other structure, and the utility model is not done qualification.
The utility model embodiment provides a kind of laser sensor and a kind of airborne particle counter of using this laser sensor.The utility model makes LASER Light Source form narrow flat photosensitive area by slit light hurdle, make 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, 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 by the utility model.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from spirit or scope of the present utility model in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, 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 described LASER Light Source is provided with a slit light hurdle, makes described LASER Light Source form the photosensitive area by described slit light hurdle; The vertical direction of described photosensitive area is provided with photelectric receiver; On the vertical direction of described photosensitive area, also be provided with admission piece and be symmetrical in the outlet nozzle of described photosensitive area; Described admission piece comprises and is used to carry the inside sampling pipe of sample gas and places the described 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, described slit light hurdle also is provided with cylindricality light hurdle along irradiation place of described LASER Light Source.
3. laser sensor according to claim 1 is characterized in that, irradiation place on described cylindricality light hurdle along described LASER Light Source also is provided with the delustring device.
4. laser sensor according to claim 3 is characterized in that, described delustring device is the delustring cavity with cattle horn shape.
5. laser sensor according to claim 1 is characterized in that, described blanket gas is a pure air.
6. laser sensor according to claim 1 is characterized in that, described 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 described laser sensor, and the signal processing apparatus that is connected with described 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 described filtration unit comprises high efficiency particulate air filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202559633U CN201780252U (en) | 2010-07-13 | 2010-07-13 | Laser sensor and dust particle counter applying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202559633U CN201780252U (en) | 2010-07-13 | 2010-07-13 | Laser sensor and dust particle counter applying same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201780252U true CN201780252U (en) | 2011-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202559633U Expired - Fee Related CN201780252U (en) | 2010-07-13 | 2010-07-13 | Laser sensor and dust particle counter applying same |
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| CN (1) | CN201780252U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102331395A (en) * | 2010-07-13 | 2012-01-25 | 苏州工业园区鸿基洁净科技有限公司 | Laser sensor and airborne particle counter with laser sensor |
| CN107966389A (en) * | 2017-12-31 | 2018-04-27 | 苏州铁树医药设备有限公司 | A kind of dust particle detection sensor and the dust detector including the sensor |
| CN113820257A (en) * | 2021-09-09 | 2021-12-21 | 麦克微尔(天津)科技有限公司 | Light blocker capable of inhibiting external illumination interference |
-
2010
- 2010-07-13 CN CN2010202559633U patent/CN201780252U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102331395A (en) * | 2010-07-13 | 2012-01-25 | 苏州工业园区鸿基洁净科技有限公司 | Laser sensor and airborne particle counter with laser sensor |
| CN107966389A (en) * | 2017-12-31 | 2018-04-27 | 苏州铁树医药设备有限公司 | A kind of dust particle detection sensor and the dust detector including the sensor |
| CN113820257A (en) * | 2021-09-09 | 2021-12-21 | 麦克微尔(天津)科技有限公司 | Light blocker capable of inhibiting external illumination interference |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110330 Termination date: 20170713 |