WO2022030843A1 - 광산란 미세먼지 측정장치 - Google Patents
광산란 미세먼지 측정장치 Download PDFInfo
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- WO2022030843A1 WO2022030843A1 PCT/KR2021/009656 KR2021009656W WO2022030843A1 WO 2022030843 A1 WO2022030843 A1 WO 2022030843A1 KR 2021009656 W KR2021009656 W KR 2021009656W WO 2022030843 A1 WO2022030843 A1 WO 2022030843A1
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- Prior art keywords
- fine dust
- light scattering
- air
- heater
- scattering fine
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- 239000000428 dust Substances 0.000 title claims abstract description 164
- 238000000149 argon plasma sintering Methods 0.000 title claims abstract description 93
- 238000005259 measurement Methods 0.000 title claims abstract description 46
- 238000010438 heat treatment Methods 0.000 claims description 49
- 238000000034 method Methods 0.000 claims description 21
- 239000002216 antistatic agent Substances 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 2
- 230000037361 pathway Effects 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 8
- 125000006850 spacer group Chemical group 0.000 description 8
- 230000003068 static effect Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 208000033986 Device capturing issue Diseases 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 239000007788 liquid Substances 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
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- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2273—Atmospheric sampling
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
- G01N15/0211—Investigating a scatter or diffraction pattern
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4022—Concentrating samples by thermal techniques; Phase changes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/065—Investigating concentration of particle suspensions using condensation nuclei counters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N2015/0042—Investigating dispersion of solids
- G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N2015/0096—Investigating consistence of powders, dustability, dustiness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N2035/00346—Heating or cooling arrangements
- G01N2035/00455—Controlling humidity in analyser
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/02—Mechanical
- G01N2201/023—Controlling conditions in casing
- G01N2201/0238—Moisture monitoring or controlling
Definitions
- the present invention relates to a fine dust measuring device, and more particularly, to a fine dust measuring device capable of accurately measuring the concentration of fine dust contained in air using a light scattering fine dust sensor.
- the light scattering method of measuring fine dust is a method of measuring the concentration of fine dust by illuminating the fine dust and receiving the scattered light.
- the light scattering fine dust measuring apparatus includes a plurality of sensors for detecting lasers scattered by the fine dust, and it is common to measure the fine dust concentration by averaging the values measured for a reference time.
- the conventional light scattering fine dust measuring device may mistake ultrafine dust for fine dust, and the increased volume of fine dust is regarded as large dust. It is not measured as fine dust.
- Such a light scattering fine dust measuring device can measure in real time and is inexpensive, but as mentioned above, there is a problem in that the accuracy of the measured value according to the relative humidity is low.
- a light scattering fine dust measuring device has been developed to control the humidity of the incoming air by installing a heater. Because the relative humidity is lowered, it takes a lot of time and energy to measure, and it has disadvantages in that it is bulky.
- the relative humidity environment that absorbs moisture in the air is different depending on the composition of the fine dust, and the type of fine dust is different depending on the location. .
- the conventional light scattering fine dust measuring device has a problem in that fine dust contained in the air introduced through the inlet is adsorbed to and around the inlet due to static electricity, so that it is impossible to accurately measure the fine dust concentration.
- Another object of the present invention is to provide a light scattering fine dust measuring device capable of improving the fine dust measurement accuracy by minimizing the generation of static electricity at the inlet.
- the light scattering fine dust measuring apparatus of the present invention comprises: a casing 110 each having an inlet 111a through which external air is introduced and an outlet 113a through which the measurement air having the measured fine dust concentration is discharged; an air flow passage 120 that connects the inlet 111a and the outlet 113a inside the casing 110 and moves the outside air; It is provided on the outside of the casing 110 and includes an external temperature and humidity sensor 140 for measuring the temperature and relative humidity of the outside air.
- the heater 130 provided on the inlet (111a) side air flow passage 120, and; A light scattering fine dust sensor 160 provided on the air flow path 120 between the heater 130 and the outlet 113a to measure the fine dust concentration of the measured air moved through the heater 130 and ; It is preferable to include an internal temperature and humidity sensor 150 provided on the air flow path 120 between the heater 130 and the light scattering fine dust sensor 160 to measure the temperature and relative humidity of the measured air.
- the accuracy of the fine dust concentration measurement can be improved by heating the external air by a heater to lower the relative humidity.
- an antistatic layer is formed on the inner wall surface of the passage through which the outside air moves, or the passage is made of an antistatic material so that fine dust is attached to the inflow path by conventional static electricity, resulting in an error in the fine dust measurement result.
- the light scattering fine dust measuring device forms an insulating layer on the inner wall surface of the sensing passage from the heater to the light scattering fine dust sensor to minimize the heat loss of the measured air having an elevated temperature, thereby securing the reliability of the fine concentration measurement result. can do.
- FIG. 1 is a perspective view showing the configuration of an apparatus for measuring light scattering fine dust according to a preferred embodiment of the present invention
- FIG. 2 is a side cross-sectional view showing the configuration of a side cross-section of a light scattering fine dust measuring device according to a preferred embodiment of the present invention
- FIG. 3 is a front cross-sectional view showing a front cross-sectional configuration of a light scattering fine dust measuring device according to a preferred embodiment of the present invention
- FIG. 4 is a block diagram schematically showing the configuration of an apparatus for measuring light scattering fine dust according to a preferred embodiment of the present invention
- 5 to 7 are exemplary views showing various modifications of the air flow path of the light scattering fine dust measuring device of the present invention.
- FIG. 8 is a flowchart illustrating a fine dust measuring process of the light scattering fine dust measuring apparatus of the present invention.
- inlet block 111a inlet
- spacer 120 air flow path
- inflow passage 121a antistatic layer
- sensing flow 125a heat insulation layer
- control unit 181 connector
- any one component in the detailed description or claims of the invention, it is not construed as being limited to only the component, unless otherwise stated, and other components are not It should be understood that more may be included.
- FIG. 1 is a perspective view showing the configuration of a light scattering fine dust measuring device 100 according to a preferred embodiment of the present invention
- FIG. 2 is a side sectional view showing a side sectional configuration of the light scattering fine dust measuring device 100
- 3 is a front sectional view showing the front cross-sectional configuration of the light scattering fine dust measuring device 100
- FIG. 4 is a block diagram schematically showing the control structure of the light scattering fine dust measuring device 100 .
- the light scattering fine dust measuring apparatus 100 has a casing in which an inlet 111a through which the outside air A1 is introduced and an outlet 113a through which the measurement air A2 is discharged are respectively formed.
- the heater 130 provided on the inlet 111a side, the external temperature and humidity sensor 140 provided outside the casing 110 to measure the temperature and relative humidity of the outside air, and the heater 130 are provided on the top It is disposed between the internal temperature and humidity sensor 150 for measuring the temperature and relative humidity of the measurement air A2 heated by the heater 130, and the internal temperature and humidity sensor 150 and the outlet 113a of the measurement air A2.
- the light scattering fine dust sensor 160 for measuring the fine dust concentration in a light scattering method and the external air A1 by selectively driving the heater 130 according to the relative humidity of the external air A1 measured by the external temperature and humidity sensor 140 ) includes a control unit 180 for lowering the relative humidity.
- the external air (A1) refers to the air introduced through the inlet (111a) from the outside of the casing 110 as shown in FIG. 2, and has an external temperature (T1) and external relative humidity (W1).
- Measuring air refers to the air in contact with the light scattering fine dust sensor 160, the fine dust concentration is measured, and has an internal temperature (T2) and internal relative humidity (W2).
- the heater 130 selectively heats the outside air A1 according to the relative humidity of the outside air A1 to lower the relative humidity of the outside air A1 to measure the air (A2) to improve the measurement accuracy of fine dust.
- the casing 110 supports each component so that the fine dust concentration can be measured by the light scattering fine dust sensor 160 after the outside air A1 is introduced.
- the casing 110 includes an inlet block 111 having an inlet 111a formed therein, an outlet block 113 having an outlet 113a formed therein, a heating block 115 in which the heater 130 is accommodated, and a light scattering fine dust sensor 160.
- a spacer 119 is provided between the received sensing block 117 and the heating block 115 and the sensing block 117 to support the internal temperature and humidity sensor 150 .
- the air flow path 120 is formed inside the casing 110 and connects the inlet 111a and the outlet 113a to the closed path.
- the air flow passage 120 includes an inflow passage 121 for guiding the outside air A1 introduced into the inlet 111a to the heating block 115, and a heating block 115 as shown in FIGS.
- a heating flow path 123 that is formed in and guides the outside air A1 to move to the spacer 119 after passing through the heater 130, and the measurement air A2 passing through the internal temperature and humidity sensor 150, a sensing block A connection passage 124 guiding to the entrance of 117 and sensing formed in the sensing block 117 to guide the measurement air A2 to move to the exit block 113 via the light scattering fine dust sensor 160 .
- It includes a flow path 125 and an outlet flow path 127 formed in the outlet block 113 to guide the measurement air A2 passing through the sensing flow path 125 to the outlet 113a.
- the inlet block 111 is disposed at the lowermost portion of the casing 110 to allow the outside air A1 to flow into the inside.
- the light scattering fine dust measuring apparatus 100 according to a preferred embodiment of the present invention has a structure in which an inlet 111a is located at a lower portion and an outlet 113a is located at an upper portion.
- a heater 130, an internal temperature and humidity sensor 150, and a light scattering fine dust sensor 160 are sequentially provided from the bottom to the top along the air flow path 120 from the inlet 111a to the outlet 113a.
- a small air flow fan 170 for discharging the measurement air A2 to the outside through the sensing block 117 is provided in the path from the heating passage 115 to the outlet 113a.
- the small air flow fan 170 is coupled to the sensing block 117 to create an air flow through which the measurement air A2 can be discharged to the outside.
- the air flow fan 170 is provided in a form in which a flow meter capable of measuring the flow rate of the measurement air A moving therein is integrally coupled.
- the inlet 111a is formed on the front side of the inflow block 111, and the inflow passage 121 is formed in a curved shape inside the inflow block 111, and the heater 130 is concealed so as not to be exposed to the outside. .
- the inflow passage 121 is formed in a curved shape or a complicated shape meandering up and down so that rain or snow does not flow into the inside and touch the heater 130 . desirable.
- the inflow passage 121 of the present invention is located on the inner wall surface of the inflow passage 121.
- An antistatic layer 121a is formed.
- the antistatic layer 121a is formed by coating with a certain thickness of a material having an antistatic function that does not generate static electricity so that the fine dust contained in the external air A1 does not adhere to the inner wall surface of the inflow passage 121 due to static electricity.
- a material having an antistatic function can be As the material having an antistatic function, various materials known in the art may be used.
- the antistatic layer 121a may be formed over the inflow passage 121 as well as the heating passage 123 , the connection passage 124 , and the sensing passage 125 .
- the inflow block 111, the heating block 115, the spacer 119, and the sensing block 117 can be made of an antistatic material without forming a separate antistatic layer 121a.
- the heating block 115 is coupled to the upper portion of the inlet block 111 and accommodates the heater 130 therein.
- a heating passage 123 is formed in the heating block 115 to communicate with the inflow passage 121 and the connection passage 124 .
- the heating block 115 is coupled to the inlet block 111 by the second fastening member 115a.
- the heater 130 is selectively operated under the control of the controller 180 and heats the outside air A1 moving along the heating passage 123 .
- the heater 130 is provided to correspond to the entire width of the heating flow path 123 and is in contact with the outside air A1 moving along the heating flow path 123 .
- the heater 130 is provided with a hot wire coil wound several times along the width of the heating passage 123 to increase the contact area with the outside air A1 to heat the outside air A1 in a short time.
- the width of the heating passage 123 is the same as or wider than that of the inflow passage 121 in order to maximize the contact area between the heater 130 and the outside air A1.
- the width of the heating passage 123 is wider than the width W1 of the inflow passage 121 , the flow rate of the outside air A1 is slowed and the contact time with the heater 130 is increased, thereby enabling more efficient heating.
- the spacer 119 is disposed between the heating block 115 and the sensing block 117 to accommodate the internal temperature and humidity sensor 150 to be spaced apart from the light scattering fine dust sensor 160 .
- a connection flow path 124 is formed inside the spacer 119 , and an internal temperature and humidity sensor 150 is disposed inside the connection flow path 124 .
- the internal temperature and humidity sensor 150 activates the light scattering fine dust sensor 160 .
- the internal temperature and humidity sensor 150 activates the light scattering fine dust sensor 160 .
- the external temperature and humidity sensor 140 is provided on one side of the inlet 111a as shown in FIG. 2 to measure the external temperature T1 and external relative humidity W1 of the external air A1 flowing into the inlet 111a. do.
- the external temperature/humidity sensor 140 may measure only one of the external temperature or external relative humidity, or both, according to the control of the controller 180 .
- the internal temperature-humidity sensor 150 is disposed in the boundary region between the heating flow path 123 and the sensing flow path 125 as shown in FIG. 3 and the internal temperature T2 or Measure the internal relative humidity (W2).
- the external temperature and humidity sensor 140 and the internal temperature and humidity sensor 150 are electrically connected to the control unit 180, respectively, and measure external temperature and external relative humidity, internal temperature and internal relative humidity to the control unit 180. send.
- the sensing block 117 is provided above the inlet block 111 , and a sensing flow path 125 is formed therein.
- the sensing flow path 125 is provided with a light scattering fine dust sensor 160 to measure the concentration of fine dust contained in the measurement air A2 moving along the sensing flow path 125 .
- the sensing flow path 125 is designed to be in contact with the light scattering fine dust sensor 160 while maintaining the heated internal temperature T2 of the measurement air A2 heated to a lower relative humidity in the heater 130 . It is preferable
- the sensing flow path 125 is designed so that the width d2 of the pipe is significantly narrower than the width d1 of the sensing flow path 125 as shown in FIG. 3 .
- the measurement air A2 heated by the heater 130 and raised to the internal temperature T2 moves rapidly while maintaining the internal temperature to come into contact with the light scattering fine dust sensor 160, and to measure the fine dust concentration more accurately value can be obtained.
- a heat insulating layer 125a is formed on the inner wall surface of the heating block 115, the spacer 119, and the sensing flow path 125, or is formed of a heat insulating material to minimize the heat loss of the measurement air A2 to maintain the internal temperature. to be moved to the
- the sensing flow path 125 has a heater 130 and a light scattering fine dust sensor ( 160), it is desirable to design a shorter moving distance (l).
- the width of the sensing passage 125 after the light scattering fine dust sensor 160 is no longer related to the sensing accuracy, the width of the pipeline is adjusted to match the width of the sensing block 117 .
- the heat insulating layer 125a is not formed in the sensing flow path 125 after the light scattering fine dust sensor 160. it may not be
- the inflow passage 121 , the heating passage 123 , the connection passage 124 , the sensing passage 125 , and the outlet passage 127 are It is desirable that the antistatic performance be designed to be high, and the heating passage 123 and the connecting passage 124 are designed to add not only antistatic performance but also thermal insulation performance.
- the light scattering fine dust sensor 160 is coupled to the inner wall surface of the sensing flow path 125 to measure fine dust contained in the measurement air A2.
- the fine dust measured by the light scattering fine dust sensor 160 includes ultrafine dust having a particle diameter of 2.5 microns ( ⁇ m) or less.
- the fine dust concentration measured by the light scattering fine dust sensor 160 is transmitted to the controller 180 through the connector 181 .
- the light scattering fine dust sensor 160 may be implemented in various known forms.
- the exit block 113 is coupled to the upper portion of the sensing block 117 .
- the outlet block 113 is fixedly coupled to the sensing block 117 and the heating block 115 using the first fastening member 113b as shown in FIGS. 1 and 2 .
- the outlet block 113 has an outlet 113a and an outlet passage 127 communicating with the sensing passage 125 are formed.
- the outlet flow path 127 guides the measurement air A2 to the outlet 113a.
- the outlet 113a may be formed in the same direction as the inlet 111a or may be formed in the opposite direction in some cases.
- the outlet flow path 127 is preferably formed in a bent shape from the outlet 113a to prevent rain or snow from entering the inside.
- 5 to 7 are exemplary views showing various modifications of the air flow passage 120 of the present invention.
- the air flow path 120 according to the preferred embodiment of the present invention has an inlet 111a formed at the lower portion and an outlet 113a formed at the upper portion, and external air flows from the lower portion to the upper portion. It is provided to be moved to
- the air flow passage 120a may have an inlet 111a formed at the upper portion and an outlet 113a formed at the lower portion so that external air is moved from the upper side to the lower side, and the fine dust concentration is measured.
- the air flow passage 120b has an inlet 111a formed on one side, an outlet 113a formed on the other side, and external air A1 in the horizontal direction. It may be formed to be movable.
- the heater 130, the internal temperature and humidity sensor 150, and the light scattering fine dust sensor 160 are sequentially from the inlet 111a to the outlet 113a regardless of the air movement direction of the air flow paths 120a and 120b. is placed as
- the light scattering fine dust measuring apparatus 100 has one inlet 111a and one outlet 113a, and one air flow path connecting the inlet 111a and the outlet 113a. (120).
- the air flow passage 120c may be formed to have a plurality of inlets 111a and 111a'.
- the plurality of inlets 111a and 111a ′ may be formed in various directions of the inflow block 111 , and may be merged and moved into one inflow passage 121 , or each independently as shown in FIG. 6( b ). may be moved along the plurality of heating passages 123 and 123'.
- the plurality of independent heating passages 123 and 123 ′ may include an independent heater 130 and an internal temperature and humidity sensor 150 , respectively.
- the measurement air A2 in contact with the heater 130 through the independent heating flow paths 123 and 123' is merged into one light scattering fine dust sensor ( After the fine dust concentration is measured in 160 ), it may be discharged to the outside through the outlet flow path 127 .
- the independent heating passages 123 and 123' may be connected to the respective sensing passages 125 and 125', respectively.
- the internal temperature and humidity sensor 150 and the light scattering fine dust sensor 160 may be provided in only one of the respective sensing passages 125 and 125 ′.
- an internal temperature and humidity sensor 150 and a light scattering fine dust sensor 160 may be provided in both of the sensing passages 125 and 125 ′.
- each of the sensing passages 125 and 125' is discharged through one outlet passage 127, or although not shown in the drawing, each of the outlet passages 127 and a plurality of outlets connected thereto It may also be discharged separately via (113a).
- the air flow passages 120d and 120e include one heater 130 and one heating passage 123 , and a plurality of separated sensing passages 125 and 125 . ') may be formed.
- inlet 111a and the outlet 113a are shown in the same direction in all of the air flow paths 120 shown in FIGS. 5 to 7 , this is only an example and the directions of the inlet 111a and the outlet 113a are Conversely, it may be arranged.
- the air flow path 120 connects the inlet 111a and the outlet 113a, and the outside air passes through the heater 130, the internal temperature and humidity sensor 150, and the light scattering fine dust sensor 160 sequentially through the closed path. and can be transformed into various shapes within the range of movement.
- the control unit 180 is the internal temperature (T2) or internal relative humidity of the measurement air (A2) based on the external temperature (T1) or external relative humidity (W1) of the external air (A1) detected by the external temperature and humidity sensor 140 (140) By maintaining (W2) constant, the fine dust concentration measured by the light scattering fine dust sensor 160 can be accurately measured without being affected by the relative humidity.
- the controller 180 heats the external air (A1) by the heater 130 to increase the measurement air (A2).
- the heater 130 is operated so that the internal relative humidity W2 becomes equal to the target relative humidity Wt.
- the controller 180 sets the target relative humidity (Wt) to 35%. This was determined by reflecting the fact that the point at which the particle size of fine dust increases is around 30% through several studies, and that most national measuring stations set the relative humidity at sea level to 35%.
- the target relative humidity (Wt) may vary according to circumstances.
- the controller 180 drives the heater 130 to control the internal relative humidity (W2) of the measurement air A2 moving along the heating flow path 123 and the connection flow path 124 . Control to lower it to the target relative humidity (Wt).
- the controller 180 sets the internal relative humidity (W2) measured by the internal temperature and humidity sensor 150 in real time to the target relative humidity (Wt)
- a control technique such as proportional-integral-derivative control (PID), which further increases the power of the heater 130 if it is higher, and further decreases the internal relative humidity (W2) to reach the target relative humidity (Wt). Control.
- PID proportional-integral-derivative control
- the controller 180 operates the heater 130 using the above-described control method, the internal temperature T2 of the measurement air A2 moving along the heating passage 123 and the connection passage 124 is allowed. Possible safe temperatures may be exceeded.
- the controller 180 calculates the target temperature Tt using the following Equation 1, and controls the operation of the heater 130 based on the calculated target temperature Tt so that the internal temperature of the measurement air A2 is Safety control is performed so that the safe temperature is not exceeded.
- Target temperature (Tt) A ⁇ 237.3/(7.5-A)
- T2 is the internal temperature
- W2 is the internal relative humidity
- Wt is the target relative humidity
- the controller 180 drives the heater 130 to heat the outside air A1 moving through the heating flow path 123, and the internal temperature T2 of the measurement air A2. ) to reach the target temperature (Tt).
- the manager additionally sets the safety temperature in addition to the target temperature Tt.
- the safe temperature refers to the temperature that does not cause the light scattering fine dust measuring device to malfunction due to overheating or change the chemical composition of fine dust or ultrafine dust.
- the controller 180 controls the heater 130 by an automatic control method such as PID so that the internal temperature T2 becomes the target temperature Tt calculated by Equation 1. However, when the calculated target temperature Tt exceeds the preset safe temperature, the controller 180 controls the heater 130 by changing the target temperature Tt to the safe temperature.
- PID automatic control method
- the controller 180 immediately cuts off the power supply to the heater 130 .
- the controller 180 controls the operation of the heater 130 by periodically updating the target temperature Tt according to Equation 1 at regular time intervals.
- the target temperature is calculated using the internal temperature T2, the internal relative humidity W2, and the target relative humidity Wt.
- the target temperature may be calculated using the external temperature T1 , the external relative humidity W1 , and the target relative humidity Wt measured by the external temperature and humidity sensor 140 .
- the target temperature Tt may be calculated using Equation 2 below.
- Target temperature (Tt) A ⁇ 237.3/(7.5-A)
- T1 is the external temperature
- Tt is the target temperature
- W1 is the external relative humidity
- Wt is the target relative humidity
- the external relative humidity (W1) and the external temperature (T1) measured by the external temperature and humidity sensor 140 are not required, so the external temperature and humidity sensor 140 is not required. There is an advantage in that the configuration of the equipment can be simplified.
- the controller 180 may selectively use any one of the two methods, or may use the two methods interchangeably.
- the controller 180 corrects the fine dust concentration measured by the light scattering fine dust sensor 160 .
- the internal relative humidity (W2) of the measurement air (A2) is lower than the initial external relative humidity (W1). Accordingly, the internal temperature T2 of the measurement air A2 flowing into the light scattering fine dust sensor 160 is higher than the external temperature T1.
- the temperature of the measurement air (A2) increases, the volume of the measurement air (A2) increases than the volume of the outside air (A1).
- the fine dust concentration value is corrected by Equation 3 below.
- Calibrated fine dust concentration (fine dust concentration measured by light scattering fine dust sensor) ⁇ (273 + internal temperature) / (273 + external temperature)
- a fine dust measurement process using the light scattering fine dust measuring apparatus 100 of the present invention having such a configuration will be described with reference to FIGS. 1 to 8 .
- the light scattering fine dust measuring device 100 of the present invention is installed at the measuring place.
- the inlet (111a) is located in the lower portion of the casing (110), the outlet (113a) is located in the upper portion.
- the external temperature and humidity sensor 140 located outside the casing 110 measures the external temperature T1 and the external relative humidity W1 of the external air A1, and transmits it to the controller 180 (S110).
- the controller 180 determines whether the transmitted external relative humidity W1 is lower than a preset target relative humidity Wt (S120).
- the controller 180 cuts off the power supply to the heater 130 so that the heater 130 is not operated (S130).
- the outside air A1 is introduced through the inlet 111a, and the outside air A1 is moved to the heating flow path 123 along the inflow flow path 121 .
- an antistatic layer 121a is formed on the inner wall surface of the inflow passage 121 to prevent fine dust from adhering to the inner wall surface by static electricity, and the entire amount of external air A1 flowing into the inlet 111a is heated. It may move to the flow path 123 .
- the external air A1 introduced into the inlet 111a is moved along the inflow passage 121 and the heating passage 123, and the internal temperature and humidity sensor 150 is not heated. Through the light scattering fine dust sensor 160 is introduced.
- the light scattering fine dust sensor 160 measures the fine dust concentration of unheated external air (measured air), and transmits the measured fine dust concentration to the control unit 180 (S170).
- the controller 180 outputs the measured fine dust concentration to the outside. (S190).
- the controller 180 calculates a target temperature at which the external relative humidity becomes the target relative humidity (S140).
- the target temperature may be calculated by Equation 1 described above.
- the controller 180 supplies power to the heater 130 to operate the heater 130 (S150).
- the external air A1 introduced into the heating passage 123 is in contact with the heater 130 and is heated.
- the heated measurement air (A2) is in contact with the internal temperature and humidity sensor 150, the internal temperature (T2) or the internal relative humidity (W2) is measured.
- the internal temperature T2 measured by the internal temperature and humidity sensor 150 is the same as the target temperature Tt, it is supplied to the sensing flow path 125 and comes into contact with the light scattering fine dust sensor 160 to measure the fine dust concentration (S170) .
- the controller 180 corrects the fine dust concentration according to Equation 3 described above (S180) and outputs the fine dust concentration (S190).
- the light scattering fine dust measuring device can increase the accuracy of measuring the fine dust concentration by heating the outside air by a heater to lower the relative humidity when the relative humidity of the outside air is high.
- the light scattering fine dust measuring device forms an insulating layer on the inner wall surface of the sensing passage from the heater to the light scattering fine dust sensor to minimize the heat loss of the measured air having an elevated temperature, thereby securing the reliability of the fine concentration measurement result. can do.
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Abstract
Description
Claims (8)
- 외부공기 속 미세먼지 농도를 광산란방식으로 측정하는 광산란 미세먼지 측정장치에 있어서,외부공기가 유입되는 유입구(111a)와, 미세먼지 농도가 측정된 측정공기가 배출되는 출구(113a)가 각각 구비된 케이싱(110)과;상기 케이싱(110)의 내부에 상기 유입구(111a)와 상기 출구(113a)를 연결하며 상기 외부공기가 이동되는 공기이동유로(120)와;상기 케이싱(110)의 외측에 구비되어 외부공기의 온도와 상대습도를 측정하는 외부온습도센서(140)와;상기 유입구(111a) 측 공기이동유로(120) 상에 구비되는 히터(130)와;상기 히터(130)와 상기 출구(113a) 사이의 공기이동유로(120) 상에 구비되어 상기 히터(130)를 경유하여 이동된 측정공기의 미세먼지 농도를 측정하는 광산란미세먼지센서(160)와;상기 히터(130)와 상기 광산란미세먼지센서(160) 사이의 공기이동유로(120) 상에 구비되어 상기 측정공기의 온도와 상대습도를 측정하는 내부온습도센서(150)를 포함하는 것을 특징으로 하는 광산란 미세먼지 측정장치.
- 제1항에 있어서,상기 공기이동유로(120)는 하부에서 상부 방향, 상부에서 하부 방향, 일측에서 타측 방향 중 어느 하나의 방향으로 형성되며,상기 공기이동유로(120) 상에는 상기 외부공기의 강제 이동을 위한 공기유동팬(170)이 구비되는 것을 특징으로 하는 광산란 미세먼지 측정장치.
- 제2항에 있어서,상기 공기이동유로(120)는 상기 히터(130)로부터 상기 출구(113a)로 이어지는 복수개의 내부분기유로를 포함할 수 있으며,상기 내부분기유로 중 어느 하나에만 내부온습도센서(150)와 상기 광산란미세먼지센서(160)가 구비되는 것을 특징으로 하는 광산란 미세먼지 측정장치.
- 제2항에 있어서,상기 공기이동유로(120)는 상기 히터(130)로부터 상기 출구(113a)로 이어지는 복수개의 내부분기유로를 포함할 수 있으며,상기 복수개의 내부분기유로는 각각 내부온습도센서(150)와 상기 광산란미세먼지센서(160)가 구비되는 것을 특징으로 하는 광산란 미세먼지 측정장치.
- 제2항에 있어서,상기 공기이동유로(120)는 상기 유입구(111a)로부터 상기 히터(130)까지 이어지는 유입유로(121)와, 상기 히터(130)와 상기 내부온습도센서(150)까지 이어지는 히팅유로(123)와, 상기 내부온습도센서(150)에서 상기 광산란미세먼지센서(160)까지 이어지는 센싱유로(125)와, 상기 광산란미세먼지센서(160)에서 상기 출구(113a)까지 이어지는 출구유로(127)를 포함하는 것을 특징으로 하는 광산란 미세먼지 측정장치.
- 제5항에 있어서,상기 센싱유로(125)의 폭은 상기 히팅유로(123)의 폭보다 좁게 형성되며,상기 히팅유로(123)와 상기 센싱유로(125)의 내벽면에는 단열소재로 형성된 단열층(125a)이 구비되는 것을 특징으로 하는 광산란 미세먼지 측정장치.
- 제6항에 있어서,상기 유입유로(121)와 상기 히팅유로(123) 및 상기 센싱유로(125)의 표면에는 정전기방지 재료로 형성된 대전방지층(121a)이 구비되는 것을 특징으로 하는 광산란 미세먼지 측정장치.
- 제7항에 있어서,상기 외부온습도센서(140)에서 측정된 외부공기의 외부상대습도가 기설정된 목표상대습도 보다 높은 경우, 상기 히터(130)를 구동시켜 상기 외부공기의 외부상대습도가 상기 목표상대습도에 도달하는 목표온도까지 상기 외부공기가 가열되게 하는 제어부(180)를 더 포함하는 것을 특징으로 하는 광산란 미세먼지 측정장치.
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EP21852698.6A EP4116698A4 (en) | 2020-08-06 | 2021-07-26 | DEVICE FOR MEASURING FINE DUST BY LIGHT DIFFUSION |
US17/758,765 US20230044367A1 (en) | 2020-08-06 | 2021-07-26 | Light-scattering fine dust measurement apparatus |
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US20230044367A1 (en) | 2023-02-09 |
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