CN111175201A - Fine dust concentration measuring device - Google Patents
Fine dust concentration measuring device Download PDFInfo
- Publication number
- CN111175201A CN111175201A CN201811337277.8A CN201811337277A CN111175201A CN 111175201 A CN111175201 A CN 111175201A CN 201811337277 A CN201811337277 A CN 201811337277A CN 111175201 A CN111175201 A CN 111175201A
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- China
- Prior art keywords
- fine dust
- light
- sensor
- concentration
- dust concentration
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 239000000428 dust Substances 0.000 title claims abstract description 77
- 239000002245 particle Substances 0.000 claims description 15
- 238000005259 measurement Methods 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 14
- 238000000149 argon plasma sintering Methods 0.000 abstract description 7
- 230000035945 sensitivity Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 208000017667 Chronic Disease Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000005250 beta ray Effects 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
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- G01N15/075—
Abstract
The invention discloses a fine dust concentration measuring device. According to an embodiment of the present invention, there is provided a fine dust concentration measuring apparatus that provides an accurate measurement amount of fine dust concentration by a light scattering method.
Description
Technical Field
The invention relates to a device (Apparatus for measuring concentration of Fine Dust of Fine Dust).
Background
Fine dust induces chronic diseases in various organs of the body such as the brain, eyes, nose, skin, lungs, heart, etc.
in the prior art, as a method for measuring the concentration of fine dust, there are a weight concentration method of direct measurement, a β -ray absorption method of indirect measurement, and a light scattering method.
The light scattering method is as follows: the amount of light scattered is measured by the principle that light colliding with the substance irradiated with light is scattered, and the concentration of the fine dust is determined from the measured value. Unlike the other two methods, the method has the advantages of being capable of being realized at a lower cost and measuring the concentration of the fine dust in real time.
The light scattering method is not a method of directly measuring the concentration of fine dust, but a method of receiving a part of scattered light and measuring the concentration of the scattered light based on the intensity of the received scattered light. However, since the sensor measures the intensity of scattered light by receiving only a part of the scattered light, the intensity of the measured scattered light varies depending on the concentration, and there is a problem that the accuracy of the result cannot be ensured.
Based on the recognition of such problems, studies have been recently made to increase the amount of scattered light received by the sensor when measuring fine dust by a light scattering method.
Disclosure of Invention
(problems to be solved by the invention)
The invention aims to provide a fine dust concentration measuring device which provides accurate measurement quantity of fine dust concentration by using a light scattering method.
(measures taken to solve the problems)
One embodiment of the present invention provides a fine dust concentration measurement device for measuring a concentration of fine dust, including: a light source that irradiates light to the fine dust particles; a sensor for sensing an amount of light scattered by the fine dust particles to determine a concentration of the fine dust; a body for configuring the sensor; and a reflection film that reflects light scattered by the fine dust particles toward the sensor.
(Effect of the invention)
As described above, according to the present invention, there is an advantage that an accurate measurement amount of the fine dust concentration can be provided even when the light scattering method is used.
Drawings
Fig. 1 is an exploded perspective view showing the structure of a fine dust concentration measuring apparatus according to an embodiment of the present invention.
Fig. 2 is a perspective view showing the structure of the fine dust concentration measuring unit according to the embodiment of the present invention.
Fig. 3 is a circuit diagram of a sensor according to an embodiment of the invention.
(description of reference numerals)
100: a fine dust concentration measuring device; 110: a fine dust concentration measuring part; 120: a support;
125. 330: a hollow part; 130: a reflective film; 310: a light source; 320, a step part; 340: a sensor;
350: frame structure
Detailed Description
Fig. 1 is an exploded perspective view showing the structure of a fine dust concentration measurement device according to an embodiment of the present invention.
Referring to fig. 1, a fine dust concentration measurement device 100 according to an embodiment of the present invention includes: a fine dust concentration measuring part 110, a holder (mount)120, and a reflecting film 130.
The fine dust concentration measuring unit 110 measures the concentration of the fine dust flowing into the fine dust concentration measuring apparatus 100. The fine dust concentration measurement unit 110 irradiates light with a light source, measures the intensity of scattered light scattered by fine dust particles, and measures the concentration of fine dust.
The holder 120 is a component disposed at a specific portion of the fine dust concentration measuring unit 110, and is used to fix the reflective film 130. As shown in fig. 1, the holder 120 is disposed on a specific portion of the fine dust concentration measuring unit 110, and the reflective film 130 is disposed on the holder 120. The reflective film 130 is disposed on the holder 120 and fixed to the upper end of the fine dust concentration measuring unit 110, thereby functioning as a reflective film.
The holder 120 has a shape corresponding to the reflective film 130, particularly, a portion (hereinafter, referred to as a "first portion") contacting the reflective film 130. As shown in fig. 1, when the reflective film 130 has a truncated cone shape with its upper and lower surfaces penetrating, the holder 120 has a circular shape like the bottom surface of the reflective film 130.
Further, the holder 120 has a hollow 125 in the first portion. As described above, the reflective film 130 is disposed on the support 120. The holder 120 has a hollow 125 in the first portion, and allows scattered light or reflected scattered light to enter the reflection film 130 or the fine dust concentration measurement unit 110.
The reflective film 130 reflects the scattered light scattered by the fine dust particles toward the fine dust concentration measuring section 110. Since the scattered light scattered by the fine dust particles is scattered in all directions, the scattered light entering the fine dust concentration measuring unit 110 corresponds to a very small amount. In this way, when the concentration of the fine dust is measured by receiving only a very small portion of the scattered light, the accuracy and sensitivity of the measurement value of the concentration of the fine dust are degraded. In order to solve this problem, the reflective film 130 is disposed on the opposite side of the fine dust concentration measuring unit 110 with the fine dust particles as the center.
The reflective film 130 has a truncated cone shape or a polygonal truncated cone shape having an upper surface and a lower surface penetrating therethrough in order to reflect the scattered light. Since the fine dust needs to flow in, the upper surface of the reflection film 130 needs to be penetrated, and since the scattered light that needs to be reflected by the reflection film 130 enters the fine dust concentration measurement unit 110, the lower surface of the reflection film 130 needs to be penetrated. Even if the upper surface of the reflective film 130 is penetrated, the holder 120 is disposed in the fine dust concentration measuring unit 110 and the reflective film 130 is disposed in the holder 120, so that the air containing fine dust used for measurement cannot smoothly flow into the reflective film 130. Accordingly, a device such as a fan (fan, not shown) is disposed at the upper end of the reflective film 130, and the fine dust flows into the fine dust concentration measuring unit 110 in the reflective film 130.
The side surface of the reflection film 130 is formed of a material that can reflect light, and can have a certain curvature so that the reflected scattered light can be reflected more toward the fine dust concentration measurement unit 110. Since the side surface of the reflection film 130 has a curvature, the amount of scattered light reflected by the reflection film 130 toward the fine dust concentration measuring unit 110 increases.
The side surface of the reflective film 130 is connected to a heater (not shown) to receive heat or to generate heat by receiving current. If a device such as a fan (not shown) is not operated, the air containing fine dust flowing into the reflective film 130 cannot be smoothly circulated, and the detection efficiency of the concentration of fine dust may be lowered. In order to solve such a problem, the side of the reflective film receives heat or generates heat to circulate air containing fine dust.
Fig. 2 is a perspective view showing the structure of the fine dust concentration measuring unit according to one embodiment of the present invention.
Referring to fig. 2, the fine dust concentration measurement unit 110 according to an embodiment of the present invention includes: light source 310, step portion 320, hollow portion 330, sensor 340, frame 350, and control portion (not shown).
The light source 310 irradiates light for detecting the concentration of the fine dust to the fine dust particles. The light source 310 is fixed to one end of the frame 350 and irradiates light in a direction in which fine dust flows.
The stepped portion 320 is formed at a portion of the frame 350 in a direction in which the light sources 310 are arranged. The bracket 120 can be disposed on the step portion 320 of the frame 350 by forming the step portion 320 on the frame 350. The step 320 is formed in the frame 350 along the direction in which the light sources 310 are arranged, so that the holder 120 and the reflective film 130 can be arranged at positions suitable for reflecting scattered light scattered by fine dust particles.
The hollow portion 330 is formed in a part of the frame 350, and the scattered light can enter the sensor 340 through the hollow portion 330. The sensor 340 is disposed at the lower end of the hollow portion 330, and the frame 350 has the hollow portion 330, so that the sensor 340 can receive scattered light scattered by the fine dust particles and scattered light reflected by the reflective film 130.
The hollow portion 330 can be formed in a plurality in the frame 350 according to the number of the sensors 340. The upper end of each sensor 340 is formed with a hollow portion 330, and the sensors 340 can receive scattered light.
The sensor 340 receives scattered light or reflected scattered light to sense the amount of scattered light. The concentration of fine dust is proportional to the amount of light scattered. By utilizing such characteristics, the sensor 340 receives the scattered light scattered by the fine dust particles and the scattered light reflected by the reflective film 130, senses the amount of the scattered light, and measures the concentration of the fine dust. The sensor 340 can be constituted by a circuit as shown in fig. 3.
Fig. 3 is a circuit diagram of a sensor according to an embodiment of the present invention.
The sensed current is applied to the diode 510. In this case, since the magnitude of the current generated by the received scattered light is very small, it is necessary to amplify the current.
The current applied to the diode 510 is amplified via an amplifier 520. At this time, the ratio of amplification is determined according to the ratio of the internal resistance of the diode 510 and the resistance 540.
However, a Zener diode (Zener diode)530 is additionally connected in parallel to the resistor 540 and in a Negative Feedback (Negative Feedback) form to the amplifier 520, and thus the Sensitivity (Sensitivity) of the sensor 340 is significantly increased.
The current amplified through the amplifier 520 removes an unnecessary interference (noise) signal through a capacitor (capacitor).
That is, the sensor 340 uses the diode 510 and additionally connects the zener diode 530 to significantly increase the sensitivity, unlike the conventional art in which only the resistor is connected to the amplifier 520 to amplify the current.
Referring again to fig. 3, the sensor 340 transmits the sensed value thus sensed and amplified to a control unit (not shown), and the control unit (not shown) can check the concentration of the fine dust.
A plurality of sensors 340 may be provided, and each sensor 340 may be disposed at a different position to sense the received scattered light at a different position, whereby the control unit (not shown) may more accurately measure the concentration of the fine dust using the sensed value sensed by each sensor 340.
The control unit (not shown) controls the light source 310 to emit light. In this case, the control unit (not shown) controls the light source 310 to emit the primary light, but may control the light source to emit the primary light a plurality of times with time intervals. Higher accuracy can be provided by illuminating the light source 310 multiple times and sensing the scattered light produced each time by the sensor 340.
Claims (3)
1. A fine dust concentration measuring apparatus for measuring a concentration of fine dust, comprising:
a light source that irradiates light to the fine dust particles;
a sensor for sensing an amount of light scattered by the fine dust particles to determine a concentration of the fine dust;
a body for configuring the sensor; and
and a reflection film that reflects light scattered by the fine dust particles toward the sensor.
2. The fine dust concentration measuring apparatus according to claim 1,
the sensor is disposed in a direction perpendicular to a direction in which the light source irradiates the fine dust particles with light.
3. The fine dust concentration measuring apparatus according to claim 2,
the body has a hollow portion so as to make scattered light incident toward the sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811337277.8A CN111175201A (en) | 2018-11-12 | 2018-11-12 | Fine dust concentration measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811337277.8A CN111175201A (en) | 2018-11-12 | 2018-11-12 | Fine dust concentration measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111175201A true CN111175201A (en) | 2020-05-19 |
Family
ID=70648082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811337277.8A Pending CN111175201A (en) | 2018-11-12 | 2018-11-12 | Fine dust concentration measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111175201A (en) |
-
2018
- 2018-11-12 CN CN201811337277.8A patent/CN111175201A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200519 |
|
| WD01 | Invention patent application deemed withdrawn after publication |