KR101794707B1 - apparatus and method for measuring organic and elemental carbon in PM2.5 - Google Patents
apparatus and method for measuring organic and elemental carbon in PM2.5 Download PDFInfo
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- KR101794707B1 KR101794707B1 KR1020150061925A KR20150061925A KR101794707B1 KR 101794707 B1 KR101794707 B1 KR 101794707B1 KR 1020150061925 A KR1020150061925 A KR 1020150061925A KR 20150061925 A KR20150061925 A KR 20150061925A KR 101794707 B1 KR101794707 B1 KR 101794707B1
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 235
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 234
- 238000000034 method Methods 0.000 title claims abstract description 45
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 148
- 238000002834 transmittance Methods 0.000 claims abstract description 112
- 239000000428 dust Substances 0.000 claims abstract description 87
- 238000002310 reflectometry Methods 0.000 claims abstract description 70
- 238000004364 calculation method Methods 0.000 claims abstract description 41
- 230000035699 permeability Effects 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 239000010453 quartz Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 230000002123 temporal effect Effects 0.000 claims description 7
- 230000001678 irradiating effect Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 description 17
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 238000000611 regression analysis Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000001307 helium Substances 0.000 description 4
- 229910052734 helium Inorganic materials 0.000 description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 4
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 4
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 230000002211 methanization Effects 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 206010003645 Atopy Diseases 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010019233 Headaches Diseases 0.000 description 1
- 208000019693 Lung disease Diseases 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 208000006673 asthma Diseases 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 231100000869 headache Toxicity 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 210000002850 nasal mucosa Anatomy 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
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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
- G01N21/55—Specular reflectivity
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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
- G01N21/59—Transmissivity
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- 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
- G01N21/84—Systems specially adapted for particular applications
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- G—PHYSICS
- G01—MEASURING; TESTING
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/626—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using heat to ionise a gas
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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
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
- G01N2201/06113—Coherent sources; lasers
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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
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/121—Correction signals
- G01N2201/1211—Correction signals for temperature
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Abstract
The present invention relates to an apparatus and a method for measuring organic element carbon contained in ultrafine dust, and more particularly, to an apparatus and method for measuring organic element carbon contained in ultrafine dust, And more particularly, to an apparatus and method for measuring organic element carbon contained in ultrafine dust. The present invention relates to an oven for generating methane by heating a filter in which ultrafine dust is trapped, A carbon calculator for measuring an amount of methane produced in the oven and calculating an amount of carbon contained in the measured methane; A light receiving unit for receiving the reflected light reflected by the filter and the transmitted light transmitted through the filter, and outputting the light amount of the reflected light and the transmitted light; A transmittance calculating unit for outputting the reflectance and transmittance of the filter with respect to the laser, in contrast to the amount of light irradiated by the laser light source, on the amount of the reflected and transmitted light provided by the light receiving unit; Calculating the amount of organic carbon and the amount of elemental carbon contained in the ultrafine dust by using the amount of carbon contained in the methane provided by the carbon calculation unit and the reflectivity and the transmittance of the filter with respect to the laser provided by the permeability calculation unit And an organic carbon calculating unit. Here, the apparatus for measuring organic element carbon included in the ultrafine dust may further include a temperature sensor for measuring a temperature inside the oven, and the permeability calculating unit may calculate the permeability of the filter using the temperature Temperature information of the oven provided by the sensor can be further utilized.
Description
The present invention relates to an apparatus and a method for measuring organic element carbon contained in ultrafine dusts, and more particularly, to an apparatus and method for measuring organic element carbon contained in ultrafine dusts, And an apparatus and a method for measuring organic element carbon contained in ultrafine dust that improve the accuracy of measurement of organic carbon and elemental carbon.
The present invention relates to a technique for measuring total carbon, organic carbon and elemental carbon contained in ultrafine dust by a thermo-optical method.
Ultrafine dust is dust with a diameter of 2.5 μm or less. It consists mainly of carbon or ion components, though there are some mineral components. Ultrafine dust is not filtered through the nasal mucosa, and it penetrates directly into the alveoli at the time of inhalation to increase asthma, lung disease, headache and atopy.
In addition, it is necessary to study the concentration and composition of ultrafine dust in the air in order to implement the ultrafine dust prediction grade. Particularly, prior literature on the organic element carbon measuring apparatus included in ultrafine dust includes Judith C. Chow , et al., "The drift / optical reflectance carbon analysis system: description, evaluation and applications in US air quality studies", Atmospheric environment vol. 27A No. 8, pp. 1185-1201, 1993.
The method for measuring organic element carbon contained in ultrafine dust according to the prior art methanizes ultrafine dust collected in a quartz filter and measures the amount of methane generated at that time to determine the amount of organic carbon contained in the ultrafine dust, . At this time, the amount of organic carbon and the amount of elemental carbon can be distinguished by using the transmittance and reflectivity of the laser. In order to measure the amount of organic carbon and elemental carbon organic carbon, the laser is irradiated to the quartz filter while the methanation process is performed, and the temporal change of the reflectance and the transmittance and the temporal change of the generated methane are respectively recorded. Calculating the amount of methane produced up to the point where the initial permeability and the reflectivity are not exceeded from the recorded results, the amount of organic carbon contained in the ultrafine dust is measured and the amount of methane generated after the point in time is calculated The amount of elemental carbon contained in the fine dust is measured.
In the method for measuring organic element carbon as described above, the organic carbon is first reduced to methane rather than the element carbon existing in the quartz filter, and the reflectance and the transmittance of the filter are increased with respect to the laser only when the element carbon is reduced in the quartz filter. will be.
However, the method of measuring organic element carbon contained in ultrafine dust according to the prior art does not take into consideration the influence of the temperature change occurring in the methanation process on the reflectivity and the transmittance of the laser, There arises a problem that an error occurs in the amount of organic carbon and element carbon measured.
Accordingly, the present invention provides an apparatus and method for measuring organic element carbon contained in ultrafine dust, which improves the accuracy of elemental carbon measurement by correcting the reflectance and transmittance of a filter for laser used for elemental carbon measurement according to temperature .
Other objects of the present invention will become readily apparent from the following description of the embodiments.
According to an aspect of the present invention, there is provided an apparatus for measuring organic element carbon contained in ultrafine dust, comprising: an oven for generating methane by heating an ultrafine dust trapped in the filter; A carbon calculator for measuring an amount of methane produced in the oven and calculating an amount of carbon contained in the measured methane; A light receiving unit for receiving the reflected light reflected by the filter and the transmitted light transmitted through the filter, and outputting the light amount of the reflected light and the transmitted light; A transmittance calculating unit for outputting the reflectance and transmittance of the filter with respect to the laser based on the amounts of the reflected light and transmitted light provided by the light receiving unit; Calculating the amount of organic carbon and the amount of elemental carbon contained in the ultrafine dust by using the amount of carbon contained in the methane provided by the carbon calculation unit and the reflectivity and the transmittance of the filter with respect to the laser provided by the permeability calculation unit And an organic carbon calculating unit.
Here, the apparatus for measuring organic element carbon included in the ultrafine dust may further include a temperature sensor for measuring a temperature inside the oven, and the permeability calculating unit may calculate the permeability of the filter using the temperature Temperature information of the oven provided by the sensor can be further utilized.
Also, the equation for the reflectivity and transmittance of the filter with respect to the laser using the temperature inside the oven is
Lt; / RTI > here{
: Reflectivity and transmittance of the filter to the laser using the temperature inside the oven,: Reflectance and transmittance of the filter with respect to the laser, which is calculated using the light amount of reflected light and transmitted light measured by the light receiving unit,
: The reflectivity and transmittance of the filter to the laser produced before the start of heating with the oven,
: A regression function for the reflectance and the expected permeability according to the temperature change,
: Regression constant value,
} to be.
Also, the equation for the reflectivity and transmittance of the filter with respect to the laser using the temperature inside the oven is
Lt; / RTI > here,{
: Reflectivity and transmittance of the filter to the laser using the temperature inside the oven,: Reflectance and transmittance of the filter with respect to the laser, which is calculated using the light amount of reflected light and transmitted light measured by the light receiving unit,
: The reflectivity and transmittance of the filter to the laser produced before the start of heating with the oven,
: A regression function for the reflectance and the expected permeability according to the temperature change,
: Regression constant value,
}to be.
In addition, the laser light source may include a constant temperature system.
In addition, the oven may include an adiabatic system in a direction in which the laser light source is located.
Further, the filter may be a quartz filter.
In addition, the laser light source can irradiate a laser having a wavelength of 630 to 640 nm.
According to another aspect of the present invention, there is provided a method for measuring organic element carbon contained in ultrafine dust using an apparatus for measuring organic element carbon contained in ultrafine dust, comprising the steps of: a) Placing the filtered filter inside the oven; b) irradiating the filter with a laser having a predetermined wavelength; c) calculating the reflectance and transmittance of the filter with respect to the laser based on the reflected light reflected by the filter and the light amounts of the transmitted light transmitted through the filter; d) heating the filter using an oven to produce methane from the ultrafine dust collected in the filter; e) measuring the methane produced in the oven and calculating the amount of carbon contained in the measured methane, and repeating steps b) to e) until the production of methane is terminated .
After completion of the methane production, f) analyzing the temporal change of the reflectance and the transmittance of the filter with respect to the laser to determine when the calculation of the organic carbon is completed; g) calculating the amount of carbon contained in the methane produced in the oven and the amount of carbon contained in methane generated in the oven after the completion of the calculation of the organic carbon before the completion of the calculation of the organic carbon; Providing an amount of organic carbon and an amount of elemental carbon contained in the ultrafine dust; As shown in FIG.
According to another aspect of the present invention, there is provided a method for measuring organic element carbon contained in ultrafine dust using an apparatus for measuring organic element carbon contained in ultrafine dust, comprising the steps of: a) Placing the filtered filter inside the oven; b) irradiating the filter with a laser having a predetermined wavelength; c) calculating the reflectance and transmittance of the filter with respect to the laser based on the reflected light reflected by the filter and the light amounts of the transmitted light transmitted through the filter; d) generating temperature information within the oven; e) heating the filter using an oven and producing methane from the ultrafine dust collected in the filter; f) measuring the methane produced in the oven and calculating the amount of carbon contained in the measured methane, and repeating steps b) to f) until the production of methane is terminated. have.
G) In the process of reducing the temperature of the oven from the high temperature to the room temperature, the change of the permeability of the filter to the laser is measured, and a regression function for the expectation of the reflectance and the transmittance according to the temperature change is generated ; h) correcting the temporal change of the reflectivity and the transmittance by using the temperature information in the oven, and analyzing the corrected reflectivity and the transmittance to determine when the calculation of the organic carbon is completed; i) calculating the amount of carbon contained in the methane produced in the oven and the amount of carbon contained in the methane produced in the oven after the completion of the calculation of the organic carbon before the completion of the calculation of the organic carbon; Providing an amount of organic carbon and an amount of elemental carbon contained in the ultrafine dust;
As shown in FIG.
In addition, the equation for correcting the reflectivity and the transmittance in the step h)
Lt; / RTI > here,{
: Reflectivity and transmittance of the filter to the laser using the temperature inside the oven,: Reflectance and transmittance of the filter with respect to the laser, which is calculated using the light amount of reflected light and transmitted light measured by the light receiving unit,
: The reflectivity and transmittance of the filter to the laser produced before the start of heating with the oven,
: A regression function for the reflectance and the expected permeability according to the temperature change,
: Regression constant value,
} to be
In addition, the equation for correcting the reflectivity and the transmittance in the step h)
Lt; / RTI > here,{
: Reflectivity and transmittance of the filter to the laser using the temperature inside the oven,: Reflectance and transmittance of the filter with respect to the laser, which is calculated using the light amount of reflected light and transmitted light measured by the light receiving unit,
: The reflectivity and transmittance of the filter to the laser produced before the start of heating with the oven,
: A regression function for the reflectance and the expected permeability according to the temperature change,
: Regression constant value,
} to be.
As described above, the organic element carbon measurement device included in the ultrafine dust improved the accuracy of the measurement of the organic carbon and the element carbon by correcting the reflectance and the transmittance of the filter for the laser used for the element carbon measurement according to the temperature And methods.
1 is a block diagram of an apparatus for measuring organic element carbon included in ultrafine dust according to an embodiment of the present invention.
FIG. 2 is a graph showing the results of measurement of the amount of carbon, the reflectance and the transmittance of carbon contained in methane when the apparatus for measuring organic carbon contained in ultrafine dust according to an embodiment of the present invention is operated.
3 is a block diagram of an apparatus for measuring organic element carbon included in ultrafine dust according to another embodiment of the present invention.
FIG. 4 is a graph showing the experimental result and a regression analysis showing the change in the transmittance of the filter with respect to the laser according to the temperature.
FIG. 5 is a graph showing the results of measurement of the amount of carbon, the reflectance, and the permeability of methane contained in the ultrafine dust when the apparatus for measuring organic carbon contained in the ultra fine dust according to the present invention is operated.
6 is a flowchart illustrating a method for measuring organic element carbon included in ultrafine dust according to an embodiment of the present invention.
7 is a flowchart illustrating a method for measuring organic element carbon included in ultrafine dust according to another embodiment of the present invention.
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .
Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.
First, terms used in the following will be defined.
Organic carbon means carbon constituting an organic compound obtained from a product, an emission product, a fermentation product, or the like in all natural plant and animal systems except inorganic carbon compounds such as minerals, carbon monoxide, carbon dioxide, carbonates, hydrogen cyanide and its salts and carbon disulfide .
Elemental carbon is an extended aromatic ring of carbon atoms, meaning a substance that is black and absorbs all visible light. As for the characteristics of elemental carbon, it does not dissolve even at a high temperature exceeding 2000 degrees Celsius, and it is chemically inactive at ordinary temperature.
The organic element carbon means the sum of organic carbon and element carbon, which means total carbon.
Hereinafter, an apparatus for measuring organic element carbon included in ultrafine dust will be described in detail with reference to the accompanying drawings.
As a result of a study to develop a device for measuring organic carbon, elemental carbon and total carbon contained in ultrafine dust by a thermo-optical method, the present applicant has found that the reflectance and transmittance of a laser used for elemental carbon measurement And that the accuracy of the elemental carbon measurement can be improved by correcting the reflectivity and the transmittance of the laser according to the temperature change.
1 is a block diagram of an apparatus for measuring organic element carbon included in ultrafine dust according to an embodiment of the present invention. 1, an apparatus for measuring organic carbon contained in ultrafine dust includes an
In the
The superfine dust inside the
The
The
The laser light source can irradiate the
The light receiving unit receives the reflected light reflected by the
The transmittance calculating unit can calculate the reflectivity and transmittance of the filter with respect to the laser from the light quantity of the reflected light and the transmitted light provided by the
The organic carbon calculator calculates the amount of organic carbon and the amount of elemental carbon contained in the ultrafine dust by using the amount of carbon contained in the methane provided by the carbon calculation unit and the reflectivity and the transmittance of the filter with respect to the laser provided by the permeability calculation unit . When the amount of carbon contained in the methane provided by the carbon calculation unit and the reflectivity and transmittance of the filter with respect to the laser provided by the permeability calculation unit are provided to the organic carbon unit (time, amount of carbon at the time point, Reflectivity and transmittance), it is preferable to provide the carbon calculation unit and the measurement point of time of the transmittance calculation unit together.
The organic carbon calculating unit may be implemented by a computer having a module capable of receiving data calculated by the
The permeability calculation unit and the organic carbon calculation unit may be implemented by a computer using both a computer that includes both the data calculated by the
FIG. 2 is a graph showing the results of measurement of the amount of carbon, the reflectance and the transmittance of carbon contained in methane when the apparatus for measuring organic carbon contained in ultrafine dust according to an embodiment of the present invention is operated. Hereinafter, the principle of operation of the organic carbon calculator will be described with reference to FIG.
First, the transmission and reflection graphs are described.
Initially measured
Means the initial transmittance and reflectivity of elemental carbon contained in the ultrafine dust from the beginning. When the temperature of the entire oven is raised by starting the measurement of the organic element carbon and theIn the process of decreasing and increasing the transmittance and reflectivity after the oven operation, when the permeability and reflectivity after the oven operation becomes equal to the initial transmittance and reflectivity (=
) May be the time when the organic carbon contained in the ultrafine dust is converted from theAfter oven operation
All of the methane converted to the starting point may be methane converted directly from the organic carbon or may be converted back to methane after the organic carbon has been converted to the elemental carbon and the amount of carbon contained in the methane to this point is initially adjusted to the organic carbon Or in the form of.Further, when the
Next, the graph of the amount of carbon contained in methane will be described along with the graph of permeability and reflectance.
When the transmittance and reflectivity are not changed (=
), The amount of carbon measured from the methane produced in the3 is a block diagram of an apparatus for measuring organic element carbon included in ultrafine dust according to another embodiment of the present invention. 3, the apparatus for measuring organic element carbon included in ultrafine dust includes an
The
The temperature sensor can measure the temperature inside the
The organic carbon calculator calculates the amount of organic carbon and the amount of elemental carbon contained in the ultrafine dust by using the amount of carbon contained in the methane provided by the carbon calculation unit and the reflectivity and the transmittance of the filter with respect to the laser provided by the permeability calculation unit The temperature information of the
FIG. 4 is a graph showing the experimental result and a regression analysis showing the change in the transmittance of the filter with respect to the laser according to the temperature. Referring to FIG. 4, the permeability of the filter to the laser may be changed as shown in the graph when the temperature of the
In order to correct the reflectance and the transmittance of the filter with respect to the laser calculated from the light amount of the reflected light and the transmitted light measured by the
Regression function for reflectance and transmittance estimates as temperature changes
Can be given as a linear or quadratic equation as follows.or
here,
Is the temperature of theReferring to FIG. 4 again, a = -0.0003, b = 0.1072, and c = 2689.3 when the second regression analysis was performed from the actual experimental results. When the first regression analysis was performed, a = -0.10063, b = 2.705.32989.
The rate of change of reflectivity and transmittance to temperature
The reflectivity and transmittance of the filter with respect to the laser, which is calculated using the light amount of the reflected light and the transmitted light measured by the
FIG. 5 is a graph showing the results of measurement of the amount of carbon, the reflectance, and the permeability of methane contained in the ultrafine dust when the apparatus for measuring organic carbon contained in the ultra fine dust according to the present invention is operated. Comparing FIG. 3 and FIG. 5, it can be seen that a corrected reflectivity and transmittance graph is added in FIG.
Referring to FIG. 5, the corrected reflectivity and transmittance graph is shown in
And the graphs of reflectivity and transmittance are the same as those of the above- May be shown as a function of time.In the corrected reflectivity and transmittance graphs, the corrected transmittance and reflectivity after the oven operation becomes equal to the initial transmittance and reflectivity (=
)this ≪ / RTI > Accordingly, the section where the organic carbon contained in the ultrafine dust is converted into methane from the6 is a flowchart illustrating a method for measuring organic element carbon included in ultrafine dust according to an embodiment of the present invention. Referring to FIG. 6, a method for measuring organic element carbon included in ultrafine dust using an apparatus for measuring organic element carbon included in ultrafine dust according to an embodiment of the present invention includes the steps of: a) ; b) irradiating the filter with a laser having a predetermined wavelength; c) calculating the reflectivity and transmittance of the filter with respect to the laser, based on the reflected light reflected by the filter, the transmitted light transmitted through the filter, and the light quantities of the laser; d) heating the filter using an oven to produce methane from the ultrafine dust collected in the filter; e) measuring the methane produced in the oven and calculating the amount of carbon contained in the measured methane, and repeating steps b) to e) until the production of methane is terminated .
Next, if it is determined that the generation of methane is terminated, f) a step of analyzing the temporal change of the reflectance and the transmittance of the filter with respect to the laser to determine when the calculation of organic carbon is completed; g) calculating the amount of carbon contained in the methane produced in the oven and the amount of carbon contained in methane generated in the oven after the completion of the calculation of the organic carbon before the completion of the calculation of the organic carbon; Providing an amount of organic carbon and an amount of elemental carbon contained in the ultrafine dust; As shown in FIG.
7 is a flowchart illustrating a method for measuring organic element carbon included in ultrafine dust according to another embodiment of the present invention. Referring to FIG. 7, a method for measuring organic element carbon included in ultrafine dust using an apparatus for measuring organic element carbon included in ultrafine dust according to another embodiment of the present invention includes the steps of: a) ; b) irradiating the filter with a laser having a predetermined wavelength; c) calculating the reflectivity and transmittance of the filter with respect to the laser, based on the reflected light reflected by the filter, the transmitted light transmitted through the filter, and the light quantities of the laser; d) generating temperature information within the oven; e) heating the filter using an oven and producing methane from the ultrafine dust collected in the filter; f) measuring the methane produced in the oven and calculating the amount of carbon contained in the measured methane, and repeating steps b) to f) until the production of methane is terminated. have.
Next, when it is determined that the generation of methane is terminated, g) a change in the permeability of the filter to the laser in the process of reducing the temperature of the oven from room temperature to room temperature is measured, and a return Generating a function; h) correcting the temporal change of the reflectivity and the transmittance by using the temperature information in the oven, and analyzing the corrected reflectivity and the transmittance to determine when the calculation of the organic carbon is completed; i) calculating the amount of carbon contained in the methane produced in the oven and the amount of carbon contained in the methane produced in the oven after the completion of the calculation of the organic carbon before the completion of the calculation of the organic carbon; Thereby providing the amount of organic carbon and the amount of elemental carbon contained in the ultrafine dust.
It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It goes without saying that various modifications can be made.
100: oven 110: filter 120: carbon calculation unit
130: Temperature sensor
200: laser light source 210: light receiving unit 220: transmittance calculating unit
300: organic carbon calculation unit
Claims (14)
A carbon calculator for measuring an amount of methane produced in the oven and calculating an amount of carbon contained in the measured methane;
A laser light source for irradiating the filter with a laser having a predetermined wavelength;
A light receiving unit for receiving the reflected light reflected by the filter and the transmitted light transmitted through the filter, and outputting the light amount of the reflected light and the transmitted light;
A transmittance calculating unit for outputting the reflectance and transmittance of the filter with respect to the laser based on the amounts of the reflected light and transmitted light provided by the light receiving unit;
Calculating the amount of organic carbon and the amount of elemental carbon contained in the ultrafine dust by using the amount of carbon contained in the methane provided by the carbon calculation unit and the reflectivity and the transmittance of the filter with respect to the laser provided by the permeability calculation unit An organic carbon calculator; And
And a temperature sensor for measuring the temperature inside the oven,
Wherein the transmittance calculating unit further uses the temperature information of the oven provided by the temperature sensor to output the reflectivity and transmittance of the filter with respect to the laser so as to correct the reflectivity and transmittance of the filter. Included organic element carbon measuring device.
The equation for the reflectivity and transmittance of the filter for the laser using the temperature inside the oven is
Wherein the organic element carbon is contained in the ultrafine dust.
{ : Reflectivity and transmittance of the filter to the laser using the temperature inside the oven,
: Reflectance and transmittance of the filter with respect to the laser, which is calculated using the light amount of reflected light and transmitted light measured by the light receiving unit,
: The reflectivity and transmittance of the filter to the laser produced before the start of heating with the oven,
: A regression function for the reflectance and the expected permeability according to the temperature change,
: Regression constant value,
}
The equation for the reflectivity and transmittance of the filter for the laser using the temperature inside the oven is
Wherein the organic element carbon is contained in the ultrafine dust.
{ : Reflectivity and transmittance of the filter to the laser using the temperature inside the oven,
: Reflectance and transmittance of the filter with respect to the laser, which is calculated using the light amount of reflected light and transmitted light measured by the light receiving unit,
: The reflectivity and transmittance of the filter to the laser produced before the start of heating with the oven,
: A regression function for the reflectance and the expected permeability according to the temperature change,
: Regression constant value,
}
The laser light source
Wherein the organic element carbon measuring device comprises a constant temperature system.
The oven
And an adiabatic system in a direction in which the laser light source is located.
The filter
Wherein the filter is a quartz filter.
The laser light source
Wherein the laser is irradiated with a laser having a wavelength of 630 to 640 nm.
a) placing an ultrafine dust-trapped filter inside an oven;
b) irradiating the filter with a laser having a predetermined wavelength;
c) calculating the reflectance and transmittance of the filter with respect to the laser based on the reflected light reflected by the filter and the light amounts of the transmitted light transmitted through the filter;
d) generating temperature information within the oven;
e) heating the filter using an oven and producing methane from the ultrafine dust collected in the filter; And
f) measuring the methane produced in the oven and calculating the amount of carbon contained in the measured methane;
Wherein the steps b) to f) are repeated until the production of methane is terminated.
After the generation of methane is terminated
g) measuring a change in the transmittance of the filter with respect to the laser in the course of reducing the temperature of the oven from high temperature to room temperature, and generating a regression function for the reflectance and transmittance predictions according to the temperature change;
h) correcting the temporal change of the reflectivity and the transmittance by using the temperature information in the oven, and analyzing the corrected reflectivity and the transmittance to determine when the calculation of the organic carbon is completed; And
i) calculating the amount of carbon contained in the methane produced in the oven and the amount of carbon contained in the methane produced in the oven after the completion of the calculation of the organic carbon before the completion of the calculation of the organic carbon; Providing an amount of organic carbon and an amount of elemental carbon contained in the ultrafine dust;
The method of claim 1, further comprising measuring the concentration of organic element carbon in the ultrafine dust.
In step h)
The equation for correcting the reflectivity and the transmittance
Wherein the organic element carbon is contained in the ultrafine dust.
{ : Reflectivity and transmittance of the filter to the laser using the temperature inside the oven,
: Reflectance and transmittance of the filter with respect to the laser, which is calculated using the light amount of reflected light and transmitted light measured by the light receiving unit,
: The reflectivity and transmittance of the filter to the laser produced before the start of heating with the oven,
: A regression function for the reflectance and the expected permeability according to the temperature change,
: Regression constant value,
}
In step h)
The equation for correcting the reflectivity and the transmittance
Wherein the organic element carbon is contained in the ultrafine dust.
{ : Reflectivity and transmittance of the filter to the laser using the temperature inside the oven,
: Reflectance and transmittance of the filter with respect to the laser, which is calculated using the light amount of reflected light and transmitted light measured by the light receiving unit,
: The reflectivity and transmittance of the filter to the laser produced before the start of heating with the oven,
: A regression function for the reflectance and the expected permeability according to the temperature change,
: Regression constant value,
}
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