KR101812783B1 - Apparatus for measuring black carbon - Google Patents

Abstract

A black carbon measuring device is disclosed. A black carbon measuring device according to an embodiment of the present invention includes: a light emitting source configured to output a light source; a light guide block including a plurality of optical paths formed through the inside thereof, and configured to pass the light source, having been output from the light source, through the plurality of optical paths; a plurality of detectors provided corresponding to the plurality of optical paths so as to detect respective light sources passing through the plurality of optical paths; a processor configured to calculate a concentration of black carbon from detection data of the light source detected through the plurality of detectors; and a light scattering block positioned between the light emitting source and the light guide block, and configured to uniformly scatter the light source irradiated from the light emitting source and to guide the scattered light source to the plurality of optical paths.

Description

[0001] APPARATUS FOR MEASURING BLACK CARBON [0002]

The present invention relates to a black carbon measuring device, and more particularly to a black carbon measuring device for measuring the amount of black carbon in the air.

Generally, black carbon refers to soot that comes out when a fuel containing carbon such as coal, oil, or wood burns incompletely, and is generally the same material as carbon black that is said in engineering. Black carbon is usually found in automobile soot or black smoke from an oven. Black carbon absorbs visible light (sunlight), converts it to infrared light and discharges it into the atmosphere, which causes heat to be released together, thus affecting global warming.

Black carbon not only absorbs heat in the atmosphere, but also affects warming by reducing the extent to which the earth reflects sunlight. Earth's ice caps and glaciers reflect sunlight strongly, and it is natural that the reflectance drops when soot is put on snow or ice. It is known that carbon dioxide is about 40% and black carbon is the second highest in the world, affecting global warming.

Korean Patent Laid-Open Publication No. 10-2006-0029810 (Apr. 4, 2006, Fine dust measuring apparatus)

The embodiment of the present invention is to measure the amount of black carbon floating in the air in real time, and it is possible to minimize the cause of error in measurement due to irregular reflection or scattering of the light source, So that the accuracy of the measurement can be improved.

According to an aspect of the present invention, there is provided a light emitting device comprising: a light emitting source for outputting a light source; A light guide block including a plurality of optical paths formed through the inside of the substrate and passing light sources output from the light source through a plurality of optical paths; A plurality of detectors provided corresponding to a plurality of optical paths for detecting respective light sources passing through the plurality of optical paths; A processor for calculating the concentration of black carbon from detection data of the light source detected through the plurality of detectors; There is provided a black carbon measuring device which is disposed between a light emitting source and a light guide block and includes a light scattering block for uniformly scattering a light source irradiated from a light emitting source and guiding the light to a plurality of optical paths.

The light scattering block has a micro-etching surface, and the micro-etching surface can be formed by a sandblasting surface treatment.

The light-scattering block is made of a transparent resin series, and the surface of the microarray can be opaque.

The microring surface may comprise protrusions or depressions, and the protrusions or depressions may have a radius R in the range of 0.05 to 0.25 mm.

The black carbon measuring apparatus further includes a filter, wherein the plurality of optical paths include first, second, and third optical paths, the filter is located on the first optical path and the second optical path, A sample detector connected to one optical path, a reference detector connected to the second optical path, and a light source intensity monitoring detector connected to the third optical path.

The light scattering block is formed with a first hollow portion connected to the first optical path, and the light scattering block is provided with a suction port (I) for introducing air into the first hollow portion and the first optical path, An outlet O for discharging the air passing through the filter located on the outside can be formed.

The black carbon measuring device further includes a control circuit connected to the processor, a driving circuit controlled by the control circuit, and a memory for storing data, and the processor compares the light intensity measured by the light source intensity monitoring detector with a preset reference value The control circuit outputs a light source output adjustment signal to the driving circuit when the measured light source intensity deviates from the preset reference value and the control circuit corrects the light source intensity so that the measured light source intensity does not deviate from the predetermined reference value A current or a voltage value can be applied.

According to the embodiment of the present invention, the amount of black carbon suspended in the air is measured in real time, and the light source irradiated from the light source is more uniformly scattered, thereby minimizing the cause of measurement errors due to irregular reflection or scattering of the light source And it is possible to realize a black carbon measuring device capable of improving the accuracy of measurement by measuring the reference value more precisely than a single reference value that affects the resultant value.

1 is a perspective view illustrating a black carbon measuring device according to an embodiment of the present invention;
2 is a conceptual diagram schematically illustrating a black carbon measuring device according to an embodiment of the present invention.
3 to 5 are assembly views for explaining a coupling relationship between an optical dispersion block, a light guide block, and a plurality of detectors in a black carbon measuring apparatus according to an embodiment of the present invention.
6 is a view illustrating an outer structure and an inner structure of a light scattering block in a black carbon measuring apparatus according to an embodiment of the present invention.
7 is a cross-sectional view illustrating a cross section of the light-scattering block with reference to a cutting line A-A 'in Fig. 6;
8 is a view for explaining a process of measuring an arrival distribution of a light source in a state where a plurality of detectors are mounted on a lower portion of a light guide block.
FIG. 9 is a view for measuring the degree of each optical dispersion efficiency using a conventional black carbon measuring device and a black carbon measuring device to which an optical dispersion block according to an embodiment of the present invention is applied.
10 is a view showing a difference in optical dispersion efficiency between a conventional black carbon measuring device and a black carbon measuring device to which an optical dispersion block according to an embodiment of the present invention is applied.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, when a component is referred to as "comprising ", it means that it can include other components as well, without excluding other components unless specifically stated otherwise.

Also, throughout the specification, the term "on" means to be located above or below the object portion, and does not necessarily mean that the object is located on the upper side with respect to the gravitational direction.

Furthermore, the term " coupled " does not mean that only a physical contact is made between the respective components in the contact relation between the respective constituent elements, but the other components are interposed between the respective constituent elements, It should be used as a concept to cover until the components are in contact with each other.

The sizes and thicknesses of the respective components shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a black carbon measuring device according to the present invention will be described in detail with reference to the accompanying drawings. Referring to the accompanying drawings, the same or corresponding components are denoted by the same reference numerals, The description will be omitted.

FIG. 1 is a perspective view illustrating a black carbon measuring device according to an embodiment of the present invention, and FIG. 2 is a conceptual view schematically illustrating a black carbon measuring device according to an embodiment of the present invention.

1 and 2, a black carbon measuring apparatus according to an embodiment of the present invention includes a light emitting source 110, a light guide block 120, a plurality of detectors 131, 132 and 133, a processor 140, And a light scattering block 150 and may further comprise a detector holder 130 for fixing a plurality of detectors 131, 132 and 133 at respective corresponding positions.

Specifically, the light emitting source 110 outputs a light source, and the light guide block 120 includes a plurality of optical paths formed through the inside of the light guide block 120, and a light source output from the light emitting source 110 through the plurality of optical paths And the plurality of detectors are arranged in a number corresponding to the plurality of optical paths for detecting the respective light sources passing through the plurality of optical paths, and the processor (140) is configured to detect, from the detected data of the detected light sources, And the light scattering block 150 is disposed between the light emitting source 110 and the light guide block 120 and includes a fine grating surface so that light emitted from the light emitting source 110 Can be uniformly scattered and guided to the plurality of optical paths.

The black carbon measuring device according to an embodiment of the present invention may further include a memory 141, a display 142, a filter 160, a pump P, and a power supply (not shown).

The memory 141 may store an operating system and an application program, and an operating system may provide an operating environment for executing the program. The program is executed by the processor 140 to operate the black carbon measuring device. The processor 140 executes the executable code of the memory 141, the memory 141 stores the executable code and data, and the display 142 displays the text and the image.

The filter 160 may be a Teflon-based glass fiber filter and may be mounted on the light guide block 120 in a single filter injection fashion. Since the filter 160 is contaminated by black carbon, it must be replaced according to the number of measurements for correct measurement. The filter 160 may be injected into the filter inlet 162 through the filter holder 161.

Referring to the drawing, a filter injection port 162 is provided at the side end of the light guide block 120, and the filter 160 is inserted through the filter injection port 162. The filter inlet 162 is in the form of a passageway formed in the light guide block 120 to allow the filter 160 to pass therethrough. In order to prevent the ambient air from entering the filter 160 through the filter inlet 162 when the filter 160 is inserted at the corresponding position through the filter inlet 162, And is installed in the housing in alignment with the filter injection port 162. The cover 164 may be hinged to the housing. At this time, an opening 162 similar to the filter inlet 162 is also formed in the cover 164.

The pump P sucks air. The sucked air is collected around the filter 160 and discharged to the discharge port O through the filter 160. [ Accordingly, the pump P operates to suck air through the inlet I and to suck the sucked air around the filter 160 and discharge the filtered air through the filter 160 to the outlet O. [

The inlet (I) is connected to the pump. A water removal tube (not shown) for removing water may be additionally provided in the inlet I. Since moisture can affect the black carbon measurement, the water removal tube helps to measure the black carbon by removing moisture from the air.

A power supply (not shown) supplies power to various devices. The power supply unit receives an external power supply, converts the power supply into a DC, and supplies the DC power to various devices.

3 to 5 are assembly views illustrating the coupling relationship between the optical dispersion block 150, the light guide block 120, and the plurality of detectors in the black carbon measuring apparatus according to an embodiment of the present invention.

The light emitting source 110 can output, for example, ultraviolet light having a wavelength of 880 nm. At this time, the light source output from the light emitting source 110 may be ultraviolet light absorbed by the black carbon. Therefore, the black carbon measuring device can measure the concentration of black carbon using a wavelength of 880 nm ultraviolet light. For example, the light emitting source 110 may be a light emitting diode. In this case, the light emitting source 110 may include a circular substrate, an LED installed below the substrate, and a solar battery plate installed on the substrate .

The light guide block 120 may be made of an aluminum anodized material and may include a plurality of optical paths formed through the inside of the light guide block 120. The light guide block 120 may allow a light source output from the light emitting source 110 to pass through the plurality of optical paths. Each light source that has passed through a plurality of optical paths is detected by a corresponding detector.

The detector is composed of a number corresponding to a plurality of optical paths for detecting each light source passing through the plurality of optical paths. Specifically, the plurality of detectors includes a sample detector 131, a reference detector 132, and a light source intensity monitoring detector 133. The sample detector 131 and the reference detector 132 detect ultraviolet rays that have passed through the filter 160 placed in a certain region between the optical dispersion block 150 and the optical guide block 120. Air stays around the filter 160, and the sample detector 131 and the reference detector 132 detect ultraviolet light that has passed through the filter 160. The sample detector 131 and the reference detector 132 may process the electrical signal generated by the ultraviolet detection and output the detected data to the processor 140.

The light guide block 120 is provided with first, second and third optical paths 121, 122 and 123. The filter 160 is installed on the first optical path 121 and the second optical path 122, do. 4), and the reference detector 132 is connected to the second optical path 122 of the optical guide block 120. The reference detector 132 is connected to the first optical path 121 of the optical guide block 120, (See FIG. 4), and the light source intensity monitoring detector 133 is connected to the third optical path 123 of the light guide block 120 (see FIG. 5).

Since the air sucked through the suction port I is guided to the first optical path 121, the black carbon in the sucked air (sample) is caught by the filter 160 located on the first optical path 121. Thus, the sample detector 131 measures the light source that has passed through the contaminated filter 160 on the first optical path 121. However, since the second optical path 122 does not suck air, the reference detector 132 measures a light source (reference light) passing through the uncontaminated filter 160 on the second optical path 122.

At this time, there may be a difference in attenuation between the light source passing the filter 160 having black carbon and the light source passing the filter 160 having no black carbon. Therefore, by measuring the intensity of the light source attenuated when passing through the black carbon on the filter 160 by irradiating a light source (ultraviolet ray) of a certain wavelength through the light emission source 110 and comparing it with the intensity of the reference light of the reference detector 132, It is possible to detect the amount of black carbon in real time. At this time, the absorption coefficient of the black carbon can be calculated through the difference of the attenuation of the light source passing through the filter 160, and then the Angstrom index and the scattering angle albedo can be calculated through the black carbon scattering coefficient and the absorption coefficient.

For reference, the filters 160 disposed on the first optical path 121 and the second optical path 122 may be formed of the same single filter or may be formed of different individual filters.

The light source intensity monitoring detector 133 detects a light source that has not passed through the filter 160. The light source intensity monitoring detector 133 detects the intensity of a light source (ultraviolet ray) that has passed through the third optical path 123, processes the electric signal generated by ultraviolet ray detection, and outputs the detected data to the processor 140 .

An amplifier 134 and an analog-to-digital converter 135 may be additionally provided between the plurality of detectors and the processor 140. For example, the intensity of the light source passing through the filter 160 on the first optical path 121 is detected by the sample detector 131, which outputs an analog electric signal proportional to the intensity of the detected light source do. The analog electric signal is amplified by an amplifier 134 connected to the sample detector 131 and transmitted to the analog-to-digital converter 135. Analog to digital converter 135 converts the analog electrical signal to a digital electrical signal and transmits it to processor 140 which can analyze the transmitted signal and display it externally via display 142 .

The processor 140 calculates the concentration of black carbon from the detection data of the light source detected through the above-described detectors. The processor 140 measures the amount of black carbon in the air using the experimentally derived light absorption function. The light absorption function is a function calculated experimentally from the degree of ultraviolet absorption between the filter 160 and the detector.

For example, the processor 140 may compare the concentration measurements of the atmospheric black carbon measured by the sample detector 131 with the measurements of the concentration measurements measured through the reference detector 132 and the light source intensity monitoring detector 133 And the comparative reference values (the first reference value and the second reference value) are compared and analyzed. At this time, the electric signal of the sample detector 131 is amplified by the amplifier 134, and noise is removed to obtain a measured value. The measured value is multiplied by a plurality of reference values (the first reference value) obtained through the reference detector 132 and the light source intensity monitoring detector 133 The reference value, and the second reference value), it is possible to more accurately measure the concentration of black carbon in the atmosphere. That is, it is possible to minimize the measurement error of the equipment and improve the accuracy of the measurement by simultaneously measuring the reference value that affects the result value with a plurality of the measurement values instead of one.

6 is a view for explaining the external and internal structure of the light scattering block 150 in the black carbon measuring apparatus according to the embodiment of the present invention, and FIG. 7 is a cross- Sectional view of the block 150. FIG.

The light scattering block 150 is disposed between the light emitting source 110 and the light guide block 120 and uniformly scatters the light source (ultraviolet light) irradiated from the light emitting source 110, 1, the second and third optical paths 121, 122, and 123, respectively.

The light scattering block 150 has a microring surface 151. The micro-embossing surface 151 may be formed by, for example, sandblasting surface treatment. The light distribution block 150 is made of, for example, a transparent resin. Accordingly, the surface of the light scattering block 150 is subjected to a sandblasting surface treatment, so that the surface of the micro-embossed surface is opaque, and the degree of scattering of the light source can be controlled according to the degree of opacity.

The micro-embossing surface 151 is configured to include the protrusion 152 or the depression 153 as illustrated in Fig. The protrusion 152 or the depression 153 has a radius R in the range of 0.05 to 0.25 mm, for example. Specifically, the protrusions 152 and the depressions 153 may have a radius R of about 0.15 mm.

The optical dispersion block 150 includes a first hollow portion 154 and a second hollow portion 155 connected to the first optical path 121 and the second optical path 122 of the optical guide block 120, respectively. The first and second hollow portions 154 and 155 are formed in a hollow structure extending from the lower surface of the optical dispersion block 150 to the inside of the optical dispersion block 150, to be. The first and second hollow portions 154 and 155 may be, for example, cylindrical hollow structures.

Referring to FIG. 3, the first hollow portion 154 of the optical dispersion block 150 is matched to the first optical path 121 of the light guide block 120 and connected thereto. And the second hollow portion 155 is matched and connected to the second optical path 122. At this time, the suction port I is installed in the optical dispersion block 150, and by communicating with the first hollow portion 154, external air can be sucked into the filter 160 and the first optical path 121. Conversely, the discharge port O is provided in the light guide block 120, and communicates with the first optical path 121 corresponding to the first hollow portion 154 to discharge the air that has passed through the filter 160 back to the outside . At this time, the black carbon in the sucked air (sample) does not pass through the filter 160 on the first optical path 121 and accumulates.

FIG. 8 is a view for explaining a process of measuring the arrival distribution of a light source in a state where a plurality of detectors are mounted on a lower portion of the light guide block 120, FIG. 9 is a diagram illustrating a conventional black carbon measuring apparatus, FIG. 10 is a view illustrating a conventional black carbon measuring device and an optical dispersion block according to an embodiment of the present invention. FIG. 150) is applied to the black carbon measuring device according to the second embodiment of the present invention.

As shown in FIGS. 9 and 10, when the light amount of each detector is compared using the black carbon measuring device to which the light distributing block 150 is applied and the black carbon measuring device which is not used, It can be seen from the data that the difference in the value during the detection period is relatively small due to the homogenization of light due to the light dispersion compared to the existing product.

The black carbon measuring apparatus according to an embodiment of the present invention may further include a control circuit 170 connected to the processor 140 and a driving circuit 180 controlled by the control circuit 170. [ Here, the processor 140 compares the light source intensity measured by the light source intensity monitoring detector 133 with a preset reference value stored in the memory 141, and when the measured light source intensity is out of the reference value The control circuit 170 outputs a light source output adjustment signal to the driving circuit 180 and the control circuit 170 applies a corrected current or voltage value to the light emission source 110 so that the measured light source intensity does not deviate from the reference value. The circuit flow diagram illustrated in FIG. 2 is a close-loop control scheme.

11 is a graph showing measured values of a light source signal before and after application of a photostabilization circuit according to an embodiment of the present invention and a comparison value of transmittance based thereon.

As shown in FIG. 11, the black carbon measuring device according to the present embodiment can stabilize the light source signal (optical signal) as compared with the conventional product by applying the above-described optical stabilizing circuit. Referring to the right graph of FIG. 11, the ratio of the reference signal to the sample signal (T% = ref / sam) is stable as the vertical fluctuation width is small on the basis of 100%. As a result of the measurement, it can be seen that the T% of the improved product according to an embodiment of the present invention is very small in the vertical fluctuation with respect to 100% of the T% of the existing product.

For reference, stabilization of the light source signal is very important because it is a device for measuring low atmospheric concentration in the case of the black carbon measuring device. If the light source signal is unstable, the optical noise is increased and the signal to noise ratio of the black carbon measuring device is lowered, thereby hindering accurate concentration measurement.

12 is a graph illustrating a difference in stabilization of a light source signal before and after application of a light stabilization circuit according to an embodiment of the present invention.

As shown in FIG. 12, it can be seen from the right graph that the stabilization of the light source signal with respect to time is greatly improved as a result of experimenting the improved product and the existing product according to the present embodiment under the same conditions. As compared with the graph on the left side of FIG. 12, it can be seen that the degree of change of the light source signal over time is relatively stable in the right graph.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, 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.

110: light source
120: light guide block
121: first optical path
122: second optical path
123: Third optical path
130: detector holder
131: sample detector
132: reference detector
133: Light source intensity monitoring detector
134: Amplifier
135: Analog to Digital Converters
140: Processor
141: Memory
142: Display
150: optical dispersion block
151: Micro-angle surface
152: protrusion
153:
154: first hollow portion
155: second hollow portion
160: Filter
161: Filter holder
162: Filter inlet
164: cover
170: Control circuit
180: driving circuit
P: Pump
I: inlet
O: outlet

Claims (7)

A light emitting source for outputting a light source;
A light guide block including a plurality of optical paths formed through the inside of the plurality of optical paths and passing light sources output from the light emitting sources through the plurality of optical paths;
A plurality of detectors provided corresponding to the plurality of optical paths for detecting respective light sources passing through the plurality of optical paths;
A processor for calculating the concentration of black carbon from detection data of the light source detected through the plurality of detectors;
A light scattering block positioned between the light emitting source and the light guide block and uniformly scattering the light emitted from the light emitting source and guiding the light to the plurality of light paths;
Filter,
Wherein the plurality of optical paths include first, second, and third optical paths,
Wherein the filter is located on the first optical path and the second optical path,
The plurality of detectors
A sample detector connected to the first optical path,
A reference detector connected to the second optical path,
And a light source intensity monitoring detector connected to the third optical path.
The method according to claim 1,
Wherein the light scattering block has a micro-etching surface,
Wherein the micro-angle surface is formed by a sandblasting surface treatment.
3. The method of claim 2,
The optical dispersion block is made of a transparent resin,
And the micro-angle surface is opaque.
3. The method of claim 2,
Wherein the micro-etching surface comprises protrusions or depressions,
Wherein the protrusions or depressions have a radius R in the range of 0.05 to 0.25 mm.
delete The method according to claim 1,
A first hollow portion connected to the first optical path is formed in the optical dispersion block,
Wherein the optical dispersion block is provided with a suction port (I) for introducing air into the first hollow portion and the first optical path,
Wherein the optical guide block is formed with a discharge port (O) for discharging the air passing through the filter located on the first optical path to the outside.
The method according to claim 1,
A control circuit coupled to the processor,
A driving circuit controlled by the control circuit,
Further comprising a memory for storing data,
The processor
Comparing the light source intensity measured by the light source intensity monitoring detector with a preset reference value stored in the memory,
The control circuit
Outputting a light source output adjustment signal to the driving circuit when the measured light source intensity deviates from the reference value,
The control circuit
And applies the corrected current or voltage value to the light emission source so that the measured light source intensity does not deviate from the reference value.

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