CN210834367U - Atmospheric small-particle-size particulate collection and detection device based on LIBS - Google Patents
Atmospheric small-particle-size particulate collection and detection device based on LIBS Download PDFInfo
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- CN210834367U CN210834367U CN201921743313.0U CN201921743313U CN210834367U CN 210834367 U CN210834367 U CN 210834367U CN 201921743313 U CN201921743313 U CN 201921743313U CN 210834367 U CN210834367 U CN 210834367U
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Abstract
The utility model relates to a detection device is collected to little particle diameter particulate matter of atmosphere based on LIBS, among the device, unmanned aerial vehicle can carry the hose free end to setting for the height in the air, and a plurality of layers of pellicle that set up in the detection case are left and right cavity with the inside partition of detection case, set up the air inlet that is linked together with left cavity and the gas vent that is linked together with right cavity on the detection case. The aperture of a plurality of layers of semipermeable membranes is reduced along the airflow direction in sequence, and the aperture of the semipermeable membrane positioned on the rightmost side is 2 um. Be provided with Nd in the right side cavity: YAG pulse laser for converting Nd: the YAG pulse laser emits laser which is focused on a focusing lens on the semi-permeable membrane and a detector which is arranged facing to the laser focusing point. The utility model discloses a collect detection device simple structure, portability, flexibility are good, convenient operation, can accurately detect out the chemical composition element of fine particles and information such as content fast on line, and then realize the composition and the concentration measurement of atmosphere fine particles.
Description
Technical Field
The utility model belongs to atmosphere pollution detection area relates to a detection device is collected to little particle size particulate matter in atmosphere based on LIBS.
Background
Laser Induced Breakdown Spectroscopy (LIBS) is a novel material composition detection and analysis technique that uses laser focusing to excite plasma generated at a test site to emit light, and the formed plasma expands with decreasing temperature after the laser pulse is completed. During the cooling process, atoms and ions in an excited state undergo transition to a low-energy level or a ground state, photons with specific frequencies are emitted at the same time, characteristic spectral lines are generated, the frequency and intensity distribution of the characteristic spectral lines represent the information of element types and concentrations contained in an analysis object, and qualitative and quantitative analysis of a sample is realized by analyzing the characteristic peak intensity corresponding to elements in the spectrogram.
On the other hand, air pollution is becoming more and more serious, which causes high importance to air quality for relevant departments and people. The atmospheric pollutants include inhalable particles and toxic and harmful gases such as sulfur dioxide, oxynitride, carbon monoxide and the like, wherein the inhalable particles (represented by PM 2.5) can be suspended in the air continuously, so that the influences on the human health and the atmospheric visibility are great. At present, the rapid online detection of components, content and the like of fine particulate matters in the atmosphere becomes a popular research work, and in the actual research process, because the particle size of the fine particulate matters is very small (generally below 2.5 um), the concentration is low, and the distribution height is high, the existing equipment is complex in structure, complex to operate, poor in flexibility and portability, and difficult to rapidly and accurately detect the chemical components and the concentration of the fine particulate matters, and information prediction is sent out in cooperation with relevant departments in time.
Disclosure of Invention
The utility model provides a simple structure, flexibility, the higher atmospheric small particle size particulate matter based on LIBS of portability collect detection device, realize the quick accurate on-line measurement of the fine particles thing more than 2um of particle size.
The utility model discloses the technical scheme who adopts does:
the LIBS-based atmospheric small-particle-size particulate matter collecting and detecting device comprises a collecting device and a detecting device, wherein the collecting device comprises a hose, an air blower connected with the hose and an unmanned aerial vehicle used for carrying the free end of the hose to a set height in the air;
the detection device comprises a detection box, a spectrometer and a portable data processing computer, wherein a plurality of layers of semipermeable membranes used for filtering and collecting particles are arranged in the detection box, the interiors of the detection box are divided into a left cavity and a right cavity by the plurality of layers of semipermeable membranes, and the detection box is respectively provided with an air inlet communicated with the left cavity and an air outlet communicated with the right cavity; the apertures of the plurality of layers of semipermeable membranes are sequentially reduced along the airflow direction, and the aperture of the semipermeable membrane positioned on the rightmost side is 2 um; and an Nd: a YAG pulse laser for converting the Nd: the YAG pulse laser device comprises a focusing lens and a detector, wherein laser emitted by the YAG pulse laser device is focused on a semi-permeable membrane on the rightmost side, and the detector is arranged facing a laser focusing point; the detector, the spectrometer and the portable data processing computer are sequentially connected, and the air outlet of the air blower is connected with the air inlet of the detection box.
Further, the number of the semipermeable membrane is one layer.
Furthermore, the number of the semipermeable membranes is two, and the aperture of the semipermeable membrane positioned on the left side is 2.5 um.
Further, the collecting device further comprises a compressor, wherein an air inlet of the compressor is connected with an air outlet of the air blower, and an air outlet of the compressor is connected with an air inlet of the detection box.
Furthermore, the detector is an optical fiber probe, the detector, the spectrometer and the portable data processing computer are sequentially connected through optical fibers, and a through hole for the optical fibers to pass through is formed in the detection box.
Further, the detection box is made of aluminum alloy.
The beneficial effects of the utility model reside in that:
the utility model discloses a collect detection device simple structure, the portability is good, convenient operation. Through the height of unmanned aerial vehicle control hose air inlet, can acquire the air that specific height, specific position contain fine particles, use more in a flexible way. The semi-permeable membrane is used for collecting fine particles with the particle size of more than 2um, and the laser-induced breakdown spectroscopy technology is used for quickly and accurately detecting information such as chemical composition elements, content and the like of the fine particles on line, so that the measurement of components and concentration of the atmospheric fine particles is realized.
Drawings
FIG. 1 is a schematic view of the collecting device according to the present invention;
FIG. 2 is a schematic structural view of an analysis device according to the present invention;
reference numerals: 1-unmanned aerial vehicle, 2-hose, 3-blower, 4-compressor, 5-detection box, 501-air inlet, 502-air outlet, 6-semipermeable membrane, 7-Nd: YAG pulse laser, 8-focusing lens, 9-detector, 10-spectrometer, 11-portable data processing computer and 12-optical fiber.
Detailed Description
The atmospheric small-particle-size particulate collection and detection device based on LIBS of the present invention will be further described in detail with reference to the accompanying drawings and specific examples.
LIBS-based atmospheric small-particle-size particulate collection and detection device comprises a collection device and a detection device. As shown in fig. 1, the collecting device comprises a hose 2, a blower 3 and a compressor 4 connected in sequence, and an unmanned aerial vehicle 1 for carrying the free end of the hose 2 to a set height in the air.
As shown in fig. 2, the detection device comprises a detection box 5, a spectrometer 10 and a portable data processing computer 11. The detection box 5 is internally provided with a plurality of layers of semipermeable membranes 6 for filtering and collecting particulate matters, the detection box 5 is internally divided into a left cavity and a right cavity by the plurality of layers of semipermeable membranes 6, and the detection box 5 is provided with an air inlet 501 communicated with the left cavity and an air outlet 502 communicated with the right cavity. The aperture of the semi-permeable membranes 6 is reduced along the airflow direction in sequence, and the aperture of the semi-permeable membrane 6 positioned on the rightmost side is 2 um. Be provided with Nd in the right side cavity: YAG pulse laser 7 for applying Nd: the YAG pulse laser 7 emits laser light which is focused on a focusing lens 8 on the rightmost semi-permeable membrane 6 and a detector 9 which is arranged facing the laser light focusing point. In this embodiment, the detector 9 is an optical fiber probe, the detector 9, the spectrometer 10 and the portable data processing computer 11 are sequentially connected through an optical fiber 12, and the detection box 5 is provided with a through hole for a lead 12 to pass through. The air outlet of the compressor 4 is connected with the air inlet 501 of the detection box 5. The detection box 5 is made of aluminum alloy materials, and is light, firm and stable.
Specifically, the number of the semipermeable membranes 6 may be one layer, i.e., a semipermeable membrane having a pore size of 2 um. Particles having a particle size of less than 2um pass through the semipermeable membrane 6, while fine particles having a particle size of 2um or more remain on the semipermeable membrane 6.
In addition, the number of the semipermeable membranes 6 can be two, the aperture of the semipermeable membrane 6 on the left side is 2.5um, and the aperture of the semipermeable membrane 6 on the right side is 2 um. The semi-permeable membrane 6 on left can only be through the particulate matter that is less than 2.5um, and the semi-permeable membrane 6 on right side can only see through the particulate matter that the particle diameter is less than 2um, just so on the semi-permeable membrane 6 on right side, has left the fine particles of particle diameter 2 ~ 2.5 um.
The utility model discloses a collect detection device's principle lies in:
control 1 supporting controller of unmanned aerial vehicle, make unmanned aerial vehicle 1 carry the free end of hose 2 and hover to setting for the height, a large amount of air passes through hose 2 and gets into compressor 4 through air-blower 3, and compressor 4 can increase the concentration of small-particle size particulate matter, and because gaseous pressurized, under the pressure effect, air and suspended particle motion are more violent, are favorable to the air to pass pellicle 6. After the air carries particulate matter and filters through pellicle 6, discharges from gas vent 502, satisfies the fine particle thing of treating that the particle size requires and then has stayed on most right side pellicle 6 (can be approximate to think that the particulate matter that the particle size is greater than 2.5um in the air is obstructed by pellicle 6 and has stayed in detection case 5 left side cavity).
Opening Nd: YAG pulse laser 7, the laser emitted by it is focused on the rightmost semi-permeable membrane 6 through the focusing lens 8, the data detected by the detector 9 forms a characteristic spectral line through the spectrometer 10, the characteristic spectral line is transmitted to the portable data processing computer 11, the chemical composition elements existing in the fine particles are measured (for example, whether the particles contain toxic substances or not is detected and analyzed on line, if the particles contain lead elements, the particles can be presumed to contain lead compounds, the user can be helped to analyze the sources of the lead compounds according to the local actual conditions, and the work of law enforcement evidence collection or pollutant forecast and the like is carried out).
As for quantitative measurement, the content (namely concentration) of elements in unit volume of atmosphere can be calculated by comparing the measured spectral intensity with the corresponding standard intensity in the database and then combining the volume and the compression ratio of the air contained in the left cavity, thereby realizing the measurement of the components and the concentration of the atmospheric fine particles.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited to the embodiments described above, but rather is described in the embodiments and the description only to illustrate the principles of the invention and that various changes and modifications may be made without departing from the spirit and scope of the invention, the scope of which is defined by the appended claims, the description and the equivalents thereof.
Claims (6)
1. The LIBS-based device for collecting and detecting the small-particle-size atmospheric particulates is characterized by comprising a collecting device and a detecting device, wherein the collecting device comprises a hose (2), an air blower (3) connected with the hose (2) and an unmanned aerial vehicle (1) used for carrying the free end of the hose (2) to a set height in the air;
the detection device comprises a detection box (5), a spectrometer (10) and a portable data processing computer (11), wherein a plurality of layers of semipermeable membranes (6) used for filtering and collecting particles are arranged in the detection box (5), the plurality of layers of semipermeable membranes (6) divide the interior of the detection box (5) into a left cavity and a right cavity, and an air inlet (501) communicated with the left cavity and an air outlet (502) communicated with the right cavity are respectively arranged on the detection box (5); the apertures of the plurality of layers of semi-permeable membranes (6) are sequentially reduced along the airflow direction, and the aperture of the semi-permeable membrane (6) positioned at the rightmost side is 2 um; and an Nd: YAG pulse laser (7) for applying Nd: a focusing lens (8) for focusing laser emitted by the YAG pulse laser (7) on the rightmost semi-permeable membrane (6) and a detector (9) arranged facing a laser focusing point; the detector (9), the spectrometer (10) and the portable data processing computer (11) are sequentially connected, and the air outlet of the blower (3) is connected with the air inlet (501) of the detection box (5).
2. The LIBS-based atmospheric small-particle-size particle collection and detection device as claimed in claim 1, wherein the number of the semi-permeable membranes (6) is one layer.
3. The LIBS-based atmospheric small-particle-size particle collection and detection device as claimed in claim 1, wherein the number of the semi-permeable membranes (6) is two, and the aperture of the semi-permeable membrane (6) on the left side is 2.5 um.
4. The LIBS-based atmospheric small-particle-size particle collection and detection device as claimed in any one of claims 1 to 3, wherein the collection device further comprises a compressor (4), an air inlet of the compressor (4) is connected with an air outlet of the blower (3), and an air outlet of the compressor (4) is connected with an air inlet (501) of the detection box (5).
5. The LIBS-based atmospheric small-particle-size particulate collection and detection device as claimed in claim 1, wherein the detector (9) is an optical fiber probe, the detector (9), the spectrometer (10) and the portable data processing computer (11) are connected in sequence through an optical fiber (12), and a through hole for the optical fiber (12) to pass through is formed in the detection box (5).
6. The LIBS-based atmospheric small-particle-size particulate collection and detection device as claimed in claim 1, wherein the detection box (5) is made of aluminum alloy.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113358425A (en) * | 2021-06-08 | 2021-09-07 | 陕西省环境科学研究院 | Flare gas discharge gas sampling device and monitoring method based on unmanned aerial vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113358425A (en) * | 2021-06-08 | 2021-09-07 | 陕西省环境科学研究院 | Flare gas discharge gas sampling device and monitoring method based on unmanned aerial vehicle |
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