CN111344549A - Black carbon measuring device - Google Patents

Black carbon measuring device Download PDF

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Publication number
CN111344549A
CN111344549A CN201980005691.5A CN201980005691A CN111344549A CN 111344549 A CN111344549 A CN 111344549A CN 201980005691 A CN201980005691 A CN 201980005691A CN 111344549 A CN111344549 A CN 111344549A
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China
Prior art keywords
chamber
black carbon
light source
external air
sensing sensor
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Pending
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CN201980005691.5A
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Chinese (zh)
Inventor
李孝英
金偰中
李明秀
白承武
鲁庚元
崔宪
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Xinghe Co ltd
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Xinghe Co ltd
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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
    • G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
    • G01N15/0618—Investigating concentration of particle suspensions by collecting particles on a support of the filter type
    • 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
    • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
    • G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
    • 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
    • G01N21/59—Transmissivity
    • G01N21/5907—Densitometers
    • 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

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The disclosed black carbon measurement device (500) includes: a main light source (100) disposed at an upper end of the apparatus; a light diffusion unit (700) that transmits light of the main light source (100) to a first chamber (400), a second chamber (410), a third chamber (420), and a fourth chamber (430) disposed at a lower end; an external air inflow port (200) which introduces external air; an external air discharge port (210) that discharges the inflowing air; a filter (300) that filters black carbon in the air introduced into the external air inflow port (200); the first and second chambers (400, 410) through which air passing through the filter is circulated and discharged; and a first sensing sensor (600), a second sensing sensor (610), a third sensing sensor (620), and a fourth sensing sensor (630) which measure the intensity of light generated from the main light source (100) passing through the first to fourth chambers (400,410,420,430) to pass through the lower ends of the respective chambers.

Description

Black carbon measuring device
Technical Field
The present disclosure relates to an apparatus for measuring black carbon included in air. And more particularly, to a measurement technique for accurately measuring black carbon by using light of a single wavelength.
Background
The prior art prior to the application of the present disclosure discloses a black carbon measuring device as a technique before the improvement of the present disclosure. The technique includes a housing; a light source disposed at an upper portion of the housing; first, second and third photodetectors disposed at a lower portion of the housing; a light guide unit disposed at the housing such that light irradiated from the light source is introduced into an interior of the housing; first, second and third optical paths provided at a lower portion of the light guide unit and separately formed from the housing, respectively, to guide light passing through the light guide unit to the first, second and third photodetectors, respectively; a filter interposed between the light guide unit and the first and second optical paths; and a flow path formed in the housing to discharge the external air introduced into the housing to the outside through the light guide unit, the filter, and the first optical path.
Disclosure of Invention
Technical problem
In general, black carbon refers to soot generated when carbonaceous fuels such as coal, petroleum, and wood are incompletely combusted, which is the same substance as carbon black in engineering. Black carbon is generally included in automobile exhaust gas or black smoke generated from a pit or the like. Black carbon absorbs sunlight to be converted into infrared rays and is released into the atmosphere, and thus has an influence on global warming because it is released together with heat.
It is known that black carbon absorbs heat from the atmosphere and reduces the degree of reflection of sunlight, thereby affecting global warming. The effect of carbon dioxide on global warming is about 40%, while black carbon is known to be the second highest, about 18%.
A device has been developed that uses a single light (880nm) to measure the concentration of this black carbon in air or the atmosphere, but the effect of moisture in air cannot be eliminated. In other words, there is an example where an in-air water filter is used in the pretreatment process, but black carbon may be filtered together during the process of filtering moisture, and the present disclosure seeks to eliminate the water filter during the pretreatment process and the influence of moisture in the black carbon measurement.
Technical scheme
The present disclosure is directed to solving the above-mentioned problems, and provides a black carbon measuring apparatus,
the black carbon measuring apparatus 500 of the present disclosure includes: a main light source 100 disposed at an upper end of the apparatus;
a light diffusion unit 700 transmitting light of the main light source 100 to the first chamber 400, the second chamber 410, the third chamber 420, and the fourth chamber 430 disposed at the lower end; an external air inflow port 200 which introduces external air; an external air discharge port 210 that discharges the inflow air; a filter 300 filtering black carbon in the air introduced into the external air inflow port 200; the first and second chambers 400 and 410 through which air passing through the filter circulates and is discharged; and a first sensing sensor 600, a second sensing sensor 610, a third sensing sensor 620, and a fourth sensing sensor 630 measuring the intensity of light generated from the main light source 100 passing through the first chamber to the fourth chamber to pass through the lower end of each chamber.
In addition, according to claim 1, there is provided a black carbon measuring apparatus, which further includes an external air measuring port 220 provided at a side of the fourth chamber, so that external air is introduced without a filter and passed by light generated from the main light source 100 to be measured in the fourth sensing sensor 630.
In addition, according to claim 1, there is provided a black carbon measuring apparatus, which further includes an auxiliary light source 110 adjacent to the main light source 100 and generating light having a different frequency from the main light source 100.
In addition, a black carbon measuring apparatus is provided, the black carbon measuring apparatus 500 of the present disclosure includes: a main light source 100 disposed at an upper end of the apparatus; a light diffusion unit 700 transmitting light of the main light source 100 to the first chamber 400, the second chamber 410, the third chamber 420, and the fourth chamber 430 disposed at the lower end; an external air inflow port 200 which introduces external air; an external air discharge port 210 that discharges the inflow air; a filter 300 filtering black carbon in the air introduced into the external air inflow port 200; a first chamber 400, a second chamber 410, and a third chamber 420 through which air passing through the filter is circulated and discharged; a planar heater 710 disposed on a side surface of the external air inflow tube of the third chamber; a temperature sensor 720 that measures the temperature of the third chamber; and a first sensing sensor 600, a second sensing sensor 610, a third sensing sensor 620, and a fourth sensing sensor 630 measuring the intensity of light generated from the main light source 100 passing through the first to fourth chambers to pass through the lower end of each chamber.
Advantageous effects
According to the above configuration, in the black carbon measuring apparatus using the measurement frequency in the infrared region, the disadvantage that the absorption wavelength caused by moisture in the infrared region when the atmosphere contains a large amount of moisture may cause the black carbon to be measured inaccurately is compensated.
In addition, the limitation that can be measured at a single wavelength is overcome by using an auxiliary light source in addition to the primary light source. In other words, the problem that the existing black carbon measuring apparatus measures only black carbon is solved by alternately using two light sources, in particular, to further increase the function of measuring and warning the concentration of carbon dioxide affecting the quality of indoor air.
Drawings
Fig. 1 is a sectional view of a black carbon measuring apparatus corresponding to a first embodiment of the present disclosure.
Fig. 2 is a sectional view of a black carbon measuring apparatus corresponding to a second embodiment of the present disclosure.
Fig. 3 is a sectional view of a black carbon measuring apparatus corresponding to a third embodiment of the present disclosure.
Fig. 4 is a sectional view of a black carbon measuring apparatus corresponding to a fourth embodiment of the present disclosure.
Best mode
Detailed Description
Hereinafter, effects of the present disclosure will be described with reference to the drawings.
< example 1>
Fig. 1 is a first embodiment of the present disclosure. In the first embodiment of the present disclosure, black carbon in air introduced from the outside is filtered by a filter, the concentration of black carbon is measured from the intensity of light passing through the first chamber by a first sensing sensor located at a lower end of the first chamber, and in the second chamber, the black carbon-filtered air is introduced to measure a light absorption signal other than black carbon contained in the outside air. The third chamber is free of contamination and clean and is filled with moisture-free air for use in basic signal correction. The fourth chamber is a vacuum chamber for measuring only the optical signal to correct the entire optical signal according to the intensity of the optical signal.
A description of the black carbon measurement process according to the first embodiment of the present disclosure is as follows.
Provided is a black carbon measurement method including: the air introduced into the outside air flows into step SA 1; a black carbon filtering step SA2 in which the introduced external air is passed through a filter for measuring black carbon to filter the black carbon; a second chamber passing step SA3 in which the filtered outside air passes through a second chamber; a light generating step SA4 of generating light from a main light source; a signal measuring step SA5 of measuring signals in the first to fourth perception sensors; a light intensity correction step SA6 of adjusting the magnitude of the signals from the first to third sensors using the light signal measured in the fourth chamber; a noise signal measuring step SA7 of measuring a noise signal in air by using the optical signal measured in the third chamber and the optical signal measured in the second chamber; and a noise signal correction step SA8 of correcting the noise reduction measured in the noise signal measurement step to the measurement value measured in the first chamber.
Although the atmosphere contains various substances causing noise measured in the noise signal measurement step, it is known that the signals most affecting in the infrared ray region are the concentrations of moisture and carbon dioxide.
Therefore, by using the above-described measurement method, the measurement influence of black carbon due to moisture and carbon dioxide in the air can be reduced.
< example 2>
Another embodiment of the present disclosure has an outside air measurement port that allows outside air to freely enter the fourth chamber.
The same measurement method as in example 1 was used. The voltage applied to the light source is monitored by measuring the intensity of the light source without correction, and the magnitude of the signals of the first to fourth chambers is corrected by the magnitude of the power applied to the main light source at the time of measurement.
In addition, there is provided a black carbon concentration correction method in which a black carbon concentration value of the black carbon concentration is calculated by setting a measurement value of a second chamber, which measures outside air from which black carbon is removed, as a reference of the black carbon concentration 0 and dividing a measurement value of a first chamber, which is measured by filtering the black carbon, by a filtering time, and comparing the signal value measured in a fourth chamber.
In addition, a method is provided that determines a final black carbon concentration by using a difference between a measurement value measured in a third chamber that is clean and free of moisture and a measurement value measured in a second chamber that removes black carbon.
< example 3>
Embodiment 3 of the present disclosure uses two light sources, wherein one light source uses a main light source of 880nm for measuring black carbon, and the additional light source uses a light source showing large absorbance of carbon dioxide or moisture. For the measurement of carbon dioxide, a light source producing a wavelength of 4260nm may be used, and for the measurement of the effect of moisture in the atmosphere on the measurement of black carbon, a light source having a wavelength of 1450nm may be used.
The 880nm wavelength used for black carbon measurement is selected to be less affected by moisture and carbon dioxide, but the effect is not negligible when the concentrations of moisture and carbon dioxide increase, so a correction method using a plurality of lights can be used.
In other words, the measurement may be performed as described in embodiment 1, the light source is switched from the main light source 100 to the auxiliary light source 110 to irradiate light, the intensity of light is corrected by a signal of the fourth chamber by measuring the light signals of the second to fourth chambers, and the measurement base is maintained by the third signal, and the measurement influence of the concentration of carbon dioxide or moisture may be measured according to the type of light using the signal of the second chamber.
< example 4>
Embodiment 4 of the present disclosure is different from the embodiments 1 to 3.
First, structurally, the external air from which the black carbon is removed reaches the third chamber, and the planar heater and the temperature sensor are included in the third chamber, there is a difference in heating the external air.
This is to correct the influence of moisture in the atmosphere on the black carbon concentration measured in the first chamber by comparing the measurement value of the second chamber in which the black carbon is removed by heating in the third chamber and is not heated and the relative humidity is higher than that of the third chamber in which the relative humidity is reduced by heating, and estimating the amount of humidity contained in the outside air from the difference between the measurement values.
This correction may be performed using a wet air line graph, and may be performed using experimental data by adjusting the saturation of moisture in air through experiments.
The invention developed from the above embodiment is as follows.
Provided is a black carbon measuring apparatus, the black carbon measuring apparatus 500 including: a main light source 100 disposed at an upper end of the apparatus;
a light diffusion unit 700 transmitting light of the main light source 100 to the first chamber 400, the second chamber 410, the third chamber 420, and the fourth chamber 430 disposed at the lower end; an external air inflow port 200 which introduces external air; an external air discharge port 210 that discharges the inflow air; a filter 300 filtering black carbon in the air introduced into the external air inflow port 200; the first and second chambers 400 and 410 through which air passing through the filter circulates and is discharged; and a first sensing sensor 600, a second sensing sensor 610, a third sensing sensor 620, and a fourth sensing sensor 630 measuring the intensity of light generated from the main light source 100 passing through the first to fourth chambers to pass through the lower end of each chamber.
In addition, according to claim 1, there is provided a black carbon measuring apparatus, which further comprises an external air measuring port 220 provided at a side of the fourth chamber 430, so that external air is introduced without a filter and passed by light generated from the main light source 100 to be measured in the fourth sensing sensor 630.
In addition, according to claim 1, there is provided a black carbon measuring apparatus, which further includes an auxiliary light source 110 adjacent to the main light source 100 and generating light having a different frequency from the main light source 100.
In addition, a black carbon measuring apparatus is provided, the black carbon measuring apparatus 500 of the present disclosure includes: a main light source 100 disposed at an upper end of the apparatus; a light diffusion unit 700 transmitting light of the main light source 100 to the first chamber 400, the second chamber 410, the third chamber 420, and the fourth chamber 430 disposed at the lower end; an external air inflow port 200 which introduces external air; an external air discharge port 210 that discharges the inflow air; a filter 300 filtering black carbon in the air introduced into the external air inflow port 200; the first chamber 400, the second chamber 410, and the third chamber 420, through which the air passing through the filter circulates and is discharged; a planar heater 710 disposed on a side surface of the external air inflow tube of the third chamber; a temperature sensor 720 that measures the temperature of the third chamber; and a first sensing sensor 600, a second sensing sensor 610, a third sensing sensor 620, and a fourth sensing sensor 630 measuring the intensity of light generated from the main light source 100 passing through the first to fourth chambers to pass through the lower end of each chamber.

Claims (1)

1. A black carbon measurement apparatus (500), comprising:
a main light source (100) disposed at an upper end of the apparatus;
a light diffusion unit (700) that transmits light of the main light source (100) to a first chamber (400), a second chamber (410), a third chamber (420), and a fourth chamber (430) disposed at a lower end;
an external air inflow port (200) which introduces external air; an external air discharge port (210) that discharges the inflowing air;
a filter (300) that filters black carbon in the air introduced into the external air inflow port (200);
a first chamber (400), a second chamber (410), and a third chamber (420) through which air passing through the filter is circulated and discharged;
a planar heater (710) disposed on a side surface of the external air inflow tube of the third chamber; a temperature sensor (720) measuring a temperature of the third chamber; and
a first sensing sensor (600), a second sensing sensor (610), a third sensing sensor (620), and a fourth sensing sensor (630) which measure the intensity of light generated from the main light source (100) passing through the first chamber to the fourth chamber to pass through the lower end of each chamber.
CN201980005691.5A 2018-10-15 2019-04-29 Black carbon measuring device Pending CN111344549A (en)

Applications Claiming Priority (3)

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KR10-2018-0122870 2018-10-15
KR1020180122870A KR101960226B1 (en) 2018-10-15 2018-10-15 Apparatus for measuring black carbon
PCT/KR2019/005129 WO2020080627A1 (en) 2018-10-15 2019-04-29 Black carbon measuring device

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CN111344549A true CN111344549A (en) 2020-06-26

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Publication number Priority date Publication date Assignee Title
KR101960226B1 (en) * 2018-10-15 2019-03-20 주식회사 신코 Apparatus for measuring black carbon
KR102253468B1 (en) * 2019-10-10 2021-05-17 한국산업기술시험원 Apparatus for testing performance of black carbon measuring device
KR102588106B1 (en) 2023-05-04 2023-10-12 (주)켄텍 Pm 10 pm 2.5 .

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Publication number Priority date Publication date Assignee Title
CN204286994U (en) * 2014-07-07 2015-04-22 南通恒力医药设备有限公司 One is applicable to dust detector heating and dehumidification device
CN105651662A (en) * 2016-03-21 2016-06-08 南京信息工程大学 Aerosol mass concentration optical detection device and detection method thereof
KR20170100907A (en) * 2016-02-26 2017-09-05 순천향대학교 산학협력단 Apparatus for measuring black carbon
KR20180096234A (en) * 2017-02-21 2018-08-29 순천향대학교 산학협력단 Apparatus for measuring black carbon

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US9018583B2 (en) * 2011-03-08 2015-04-28 Magee Scientific Corporation Method for automatic performance diagnosis and calibration of a photometric particle analyzer
KR20160090723A (en) * 2015-01-21 2016-08-01 순천향대학교 산학협력단 Black carbon measuring apparatus
KR101812783B1 (en) * 2017-07-20 2017-12-28 순천향대학교 산학협력단 Apparatus for measuring black carbon
KR101960226B1 (en) * 2018-10-15 2019-03-20 주식회사 신코 Apparatus for measuring black carbon

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204286994U (en) * 2014-07-07 2015-04-22 南通恒力医药设备有限公司 One is applicable to dust detector heating and dehumidification device
KR20170100907A (en) * 2016-02-26 2017-09-05 순천향대학교 산학협력단 Apparatus for measuring black carbon
CN105651662A (en) * 2016-03-21 2016-06-08 南京信息工程大学 Aerosol mass concentration optical detection device and detection method thereof
KR20180096234A (en) * 2017-02-21 2018-08-29 순천향대학교 산학협력단 Apparatus for measuring black carbon

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KR101960226B1 (en) 2019-03-20

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Application publication date: 20200626