CN111693416A - Method for determining particle measurement standard of particle detection device - Google Patents
Method for determining particle measurement standard of particle detection device Download PDFInfo
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- CN111693416A CN111693416A CN201910196520.7A CN201910196520A CN111693416A CN 111693416 A CN111693416 A CN 111693416A CN 201910196520 A CN201910196520 A CN 201910196520A CN 111693416 A CN111693416 A CN 111693416A
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- 239000002245 particle Substances 0.000 title claims abstract description 98
- 238000001514 detection method Methods 0.000 title claims abstract description 92
- 238000005259 measurement Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000443 aerosol Substances 0.000 claims abstract description 55
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 230000003111 delayed effect Effects 0.000 claims abstract description 7
- 230000000737 periodic effect Effects 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims 1
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 210000004072 lung Anatomy 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 208000024172 Cardiovascular disease Diseases 0.000 description 1
- 206010061218 Inflammation Diseases 0.000 description 1
- 208000006673 asthma Diseases 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003928 nasal cavity Anatomy 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 210000003135 vibrissae Anatomy 0.000 description 1
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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
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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- General Health & Medical Sciences (AREA)
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- Investigating Or Analysing Materials By Optical Means (AREA)
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Abstract
A method for determining a particle measurement standard of a particle detection device comprises the following steps: providing a particle detection device for detecting suspended particles in gas, wherein the particle detection device comprises a detection part and a micro pump for detecting the suspended particles; the micropump adopts an intermittent working operation mode to implement stable gas guide transmission; the detection part adopts a delayed detection reading mode to capture a section of stable suspended particles for counting and detecting; and the aerosol counting detected by the detection part is used for carrying out standard judgment on the multi-block high-low concentration parameters, so that the microprocessor compares the aerosol counting according to the multi-block high-low concentration parameters to calculate so as to convert and output the aerosol concentration.
Description
Technical Field
The present invention relates to a method for determining a particle measurement standard of a particle detection device, and more particularly, to a method for determining a particle measurement standard of a particle detection device that utilizes a micro pump to introduce gas and cooperates with a particle detection module for monitoring.
Background
In recent years, the problem of gas pollution is becoming more serious, and how to avoid various pollutants in gas from harming health is becoming a topic of great attention. The common pollutants in the gas include aerosols (e.g., PM2.5), which refer to solid particles or liquid droplets contained in the gas, and because of their very fine particle size, the solid particles or liquid droplets easily enter the lungs of the human body through the nose hair in the nasal cavity, thereby causing inflammation, asthma or cardiovascular diseases of the lungs, and if other pollutants adhere to the aerosols, the pollutants further aggravate the harm to the respiratory system. The concentration data of fine suspended particles is often too high, the monitoring of the concentration of the gas suspended particles is gradually paid attention to, but because gas can flow along with wind direction and air quantity in an uncertain amount, most of the existing gas quality monitoring stations for detecting the suspended particles are fixed points, the concentration of the current surrounding suspended particles cannot be confirmed at all, and therefore a micro portable particle detection device is needed for a user to detect the concentration of the surrounding suspended particles anytime and anywhere.
Current particle detection devices are devices that alert the user when airborne particles (e.g., PM2.5) in the environment are detected to a level of harm. The present invention provides a method for determining the particle measurement standard of a particle detection device, so as to solve the problem of detection accuracy, because the current detection technology has the problem of detection accuracy under the condition of small device size, how to achieve high detection accuracy, and still have an improved space for real-time and accurate detection.
Disclosure of Invention
The invention provides a method for determining the particle measurement standard of a particle detection device, which utilizes the method for determining the particle measurement standard of the particle detection device, utilizes a micropump to implement stable gas guide transmission in an intermittent working operation mode, and enables a detection part to adopt a delayed detection reading mode to capture a section of stable aerosol counting for detection so as to provide more stable and accurate detection standard determination, and the aerosol counting detected by the detection part is subjected to multi-block standard determination of high and low concentration parameters, so that a microprocessor compares the aerosol counting according to the multi-block high and low concentration parameters for operation so as to convert and output the aerosol concentration, thereby achieving the effect of quickly and accurately measuring the gas aerosol concentration.
The method for determining the particle measurement standard of the particle detection device comprises the following steps: providing a particle detection device for detecting suspended particles in gas, wherein the particle detection device comprises a detection part and a micro pump for detecting the suspended particles; the micropump adopts an intermittent working operation mode to implement stable gas guiding transmission; the detection part adopts a delayed detection value reading mode to capture a section of stable suspended particles for counting and detecting; and the aerosol counting detected by the detection part is subjected to standard judgment of a multi-block high-low concentration parameter, so that the microprocessor compares the aerosol counting according to the multi-block high-low concentration parameter to calculate so as to convert and output the aerosol concentration.
Drawings
FIG. 1 is a schematic view of the particle detecting apparatus.
Fig. 2 is an exploded view of the related components of the particle detecting device.
Fig. 3 is a schematic structural diagram of a base of the particle detecting device.
Fig. 4 is a schematic view showing the air guide and light source projection when the particle detector detects particles.
Fig. 5 is a schematic diagram illustrating an intermittent operation mode of the micro-pump of the particle detecting device.
FIG. 6 is a schematic view showing intermittent concentration counting performed by the particle detecting apparatus of the present invention.
Fig. 7 is a schematic diagram illustrating the aerosol count detected by the particle detection device and the standard determination of the actual gas concentration.
FIG. 8 is a flowchart illustrating a method for determining a particle measurement standard of the particle detecting device according to the present invention.
Description of the reference numerals
1: base seat
1 a: first surface
1 b: second surface
11: detecting component bearing area
12: micropump carrier region
121: bearing frame groove
122: air inlet port
123: exhaust port
13: detection channel
14: light beam channel
15: light trapping region
2: detection component
21: microprocessor
22: particle sensor
23: laser device
3: micro pump
4: drive control panel
5: outer cover plate
5 a: upper cover plate
51 a: inlet inlet
52 a: exhaust outlet
5 b: lower cover plate
51 b: air inlet opening
52 b: exhaust opening
L: projection light source
S1-S4: step (ii) of
Detailed Description
Embodiments that embody features and advantages of the invention are described in detail in the description that follows. It is to be understood that the invention is capable of modification in various respects, all without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature, and not as restrictive.
Referring to fig. 1 to 4, a particle detecting apparatus is provided, which includes a base 1, a detecting part 2, a micro pump 3, a driving control board 4 and an outer cover 5. The substrate 1 has a first surface 1a and a second surface 1b, the first surface 1a and the second surface 1b are opposite to each other, and the interior thereof is partitioned into a detecting component carrying region 11, a micro-pump carrying region 12, a detecting channel 13, a beam channel 14 and an optical trap region 15. Wherein the detection channel 13 and the beam channel 14 are disposed at an orthogonal position, and the beam channel 14 is orthogonally penetrated through the detection channel 13 and connected to the optical trap region 15. The driving control board 4 is covered on the second surface 1b of the base 1, and the detecting channel 13 is covered by the cover to form a straight gas flowing path. The detecting component 2 is positioned on the driving control board 4 and electrically connected thereto, and is disposed in the detecting component carrying region 11. The micro pump 3 is electrically connected to the driving control board 4 to be driven (not shown). The micro-pump carrying region 12 has a carrying frame groove 121 and an air inlet 122 at the bottom, and an air outlet 123 at the top side for communicating with the outside. The air inlet port 122 communicates between the detection passage 13 and the receiving frame groove 121, and the micro pump 3 is received and positioned in the receiving frame groove 121. The micro pump 3 can generate a suction force to the detection channel 13 communicated with the bearing frame groove 121 when being driven to operate, so as to introduce the gas outside the detection channel 13 into the detection channel 13, and then introduce the gas above the bearing frame groove 121 through the transmission of the micro pump 3, and then exhaust the gas outside through the exhaust port 123, thereby completing the guidance of gas detection (as the guidance of the path indicated by the arrow in fig. 4). Also, the detecting unit 2 includes a microprocessor 21, a particle sensor 22 and a laser 23. Wherein the microprocessor 21, the particle sensor 22 and the laser 23 are packaged on the driving control board 4. The laser 23 is correspondingly disposed in the detecting part carrying area 11 and can emit the projection light source L in the light beam channel 14. The particle sensor 22 is disposed at the position orthogonal to the detection channel 13 and the light beam channel 14, such that the microprocessor 21 can control the driving operations of the laser 23 and the particle sensor 22, so that the projection light source L of the laser 23 irradiates the light beam channel 14 and passes through the detection channel 13 and the position orthogonal to the light beam channel 14 to irradiate the aerosol (e.g., PM2.5) contained in the gas passing through the detection channel 13, and the aerosol contained in the irradiated gas can generate a projection light spot to be projected to the particle sensor 22 for detection and calculation. The particle sensor 22 can detect the aerosol contained in the gas and output a detection signal, and the microprocessor 21 receives the detection signal output from the particle sensor 22 and performs an operation to analyze the size and concentration of the aerosol contained in the gas and output detection data. The outer covering plate 5 includes an upper covering plate 5a and a lower covering plate 5 b. The upper cover plate 5a covers the first surface 1a of the base 1, and has an air inlet 51a at a position corresponding to the air inlet outside the detection channel 13 of the base 1, and an air outlet 52a at a position corresponding to the air outlet 123 of the micro-pump carrier 12. And the lower cover member 5b covers the second surface 1b of the susceptor 1 and is fitted with the upper cover member 5a to seal the susceptor 1, and an intake opening 51b is provided corresponding to a region of the intake inlet 51a of the upper cover member 5a and an exhaust opening 52b is provided corresponding to a region of the exhaust outlet 52a of the upper cover member 5 a. Thus, the gas outside the particle detection device can be introduced into the detection channel 13 of the base 1 through the inlet opening 51b and the inlet opening 51a, and the gas in the detection channel 13 of the base 1 can be exhausted from the exhaust opening 123 of the micro-pump bearing region 12, and then exhausted outside the particle detection device through the exhaust outlet 52a and the exhaust opening 52 b.
As can be seen from the above description, the particle detection apparatus provided in the present application is specifically implemented for measuring aerosol particles, and the method for determining the particle measurement standard is shown in fig. 8, and the steps thereof are detailed as follows.
First, in step S1, a particle detecting device is provided for detecting the suspended particles in the gas, which includes a detecting component and a micro pump for detecting the suspended particles. As shown in fig. 1 to 4, the particle detecting apparatus provided in the present application is composed of a base 1, a detecting component 2, a micro pump 3, a driving control board 4 and an outer cover component 5, as described above, when the micro pump 3 is driven to operate, the micro pump 3 generates a suction force to the detecting channel 13 communicated with the bearing frame groove 121, so as to introduce the external gas of the detecting channel 13 into the detecting channel 13, then introduce the gas above the bearing frame groove 121 through the micro pump 3, and discharge the gas from the exhaust port 123 to the outside, thereby completing the guiding and transmission of the gas detection (as indicated by the arrow in fig. 4). The microprocessor 21 controls the driving operations of the laser 23 and the particle sensor 22, so that the projection light source L of the laser 23 irradiates the light beam channel 14 and passes through the detection channel 13 to be orthogonal to the light beam channel 14, so as to irradiate the aerosol (for example, PM2.5) contained in the gas passing through the detection channel 13, and the aerosol contained in the irradiated gas generates a projection light spot to be projected to the particle sensor 22 for detection and calculation. The particle sensor 22 can detect the aerosol contained in the gas and output a detection signal, and the microprocessor 21 receives the detection signal output by the particle sensor 22 and performs an operation to analyze the size and concentration of the aerosol contained in the gas and output detection data to complete the detection of the aerosol. Thus, the particle detection device provided by the present invention can be constructed into miniaturized size volumes with a length of 30 mm, a width of 30 mm and a height of 50 mm, and can be applied and assembled on a portable electronic device to form a mobile particle detection device.
In step S2, the micropump performs stable gas delivery using an intermittent mode of operation. The particle detecting device uses the micro pump 3 to guide the gas to accelerate the detection efficiency of the external gas, however, when the micro pump 3 is used, the problems of large driving voltage, large working current and small gas flow are caused, so when the micro pump 3 is used to guide the gas into the particle detecting device, an intermittent working operation mode is required. As shown in fig. 5, the micro-pump 3 uses an intermittent operation mode, which is a periodic operation mode with 10 seconds of Operation (ON) and 20 seconds of OFF (OFF), to achieve the effect of saving energy and improve the life of the micro-pump 3.
In step S3, the detection component uses a delayed detection reading to capture a stable aerosol count for detection. The particle detection device is performed by using a laser 23 in combination with a particle sensor 22 according to the mie scattering principle, and generates scattered light from gas aerosol to a laser spot and emits the scattered light to the particle sensor 22 to count the number of gas aerosol and determine the size of the gas aerosol. However, when the micro-pump 3 is operated in the intermittent operation mode, it takes a stable time for the micro-pump 3 to introduce gas into the particle detection device, and if a standard determination of the aerosol particle count is made at this time, the count will be unstable (as shown in the area of circle B in fig. 6). Therefore, after a period of time (for example, after every 3 seconds of operation of the micro pump 3), the gas flow rate in the flow channel reaches a stable gas flow rate (as shown in the area of the circle a in fig. 6), and the particle sensor 22 of the particle detection device can detect the stable aerosol count. Thus, the particle sensor 22 of the particle detection device can be used with a delayed detection reading mode to perform stable and accurate detection standard determination.
In step S4, the aerosol count detected by the detecting component is subjected to multi-block high-low concentration parameter standard determination, so that the microprocessor compares the aerosol count with the multi-block high-low concentration parameter to convert and output the aerosol concentration. The particle sensor 22 of the particle detection device performs actual detection of aerosol counting under optical scattering reaction, and then performs actual detection comparison with actual gas concentration under the same environment. As shown in fig. 7, which is a graph of the actual measurement of the aerosol concentration versus the actual gas concentration (PM2.5 concentration), the curve is obtained from the results of 61 measurements, and it can be seen that the aerosol concentration in the air and the aerosol concentration exhibit very good consistency, but a large deviation value is found at low concentration when the concentration standard determination comparison is performed. Since the microprocessor 21 compares the aerosol count according to a one-step parameter, and the obtained aerosol concentration has a larger error rate, the standard determination of the aerosol concentration and the aerosol count in the present case is divided into 2 blocks, the block 1 is used as the standard determination that the aerosol count is higher than 50 to perform the high concentration parameter comparison operation, and the block 2 is used as the standard determination that the aerosol count is lower than 50 to perform the low concentration parameter comparison operation, so that the microprocessor 21 is prompted to compare the standard determination of the aerosol count with the high and low concentration parameters in multiple blocks to convert the comparison operation into the correction operation closer to the actual gas concentration. The error rate of the converted concentration of the suspended particles can be less than 10 percent by counting the suspended particles after being judged by the partition standard, so that the particle detection device achieves the effect of quickly and accurately measuring the concentration of the gas suspended particles.
In summary, the method for determining the particle measurement standard of the particle detection device provided by the present invention utilizes the micro pump to implement stable gas guiding transmission in an intermittent operation mode, and the detection unit employs a delayed detection value reading mode to capture a section of stable aerosol count for detection, so as to provide a more stable and accurate detection standard determination, and the aerosol count detected by the detection unit performs a standard determination of multi-block high-low concentration parameters, so that the microprocessor compares the aerosol count with the multi-block high-low concentration parameters for operation, so as to convert and output the aerosol concentration, thereby achieving the purpose of rapidly and accurately measuring the gas aerosol concentration for industrial use.
The present invention may be modified in various ways by those skilled in the art without departing from the scope of the appended claims.
Claims (3)
1. A method for determining a particle measurement standard of a particle inspection apparatus, comprising the steps of:
a. providing a particle detection device for detecting suspended particles in gas, wherein the particle detection device comprises a detection part and a micro pump for detecting the suspended particles;
b. the micropump adopts an intermittent working operation mode to implement stable gas guiding transmission;
c. the detection part adopts a delayed detection value reading mode to capture a section of stable aerosol for counting and detecting; and
d. the aerosol counting detected by the detecting component is subjected to standard judgment of a multi-block high-low concentration parameter, so that a microprocessor compares the aerosol counting according to the multi-block high-low concentration parameter to calculate so as to convert and output the aerosol concentration.
2. The method as claimed in claim 1, wherein the intermittent operation mode is a periodic operation mode in which the micro pump is operated for 10 seconds and is turned off for 20 seconds.
3. The method of claim 1, wherein the multi-block criterion determination of high and low concentration parameters is divided into 2 blocks, wherein block 1 is used as the criterion determination that the aerosol count is higher than 50, so that the microprocessor performs the high concentration parameter comparison operation, and block 2 is used as the criterion determination that the aerosol count is lower than 50, so that the microprocessor performs the low and high concentration parameter comparison operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910196520.7A CN111693416A (en) | 2019-03-15 | 2019-03-15 | Method for determining particle measurement standard of particle detection device |
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| CN201910196520.7A CN111693416A (en) | 2019-03-15 | 2019-03-15 | Method for determining particle measurement standard of particle detection device |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04337446A (en) * | 1991-05-15 | 1992-11-25 | Hitachi Ltd | Method and device for measuring fine grain and constant quantity method |
| DE69427743T2 (en) * | 1993-12-22 | 2001-11-15 | Johnson & Johnson Clinical Diagnostics, Inc. | Method for recalibrating an analyzer |
| CN103399123A (en) * | 2013-07-12 | 2013-11-20 | 河南汉威电子股份有限公司 | Automatic gas sensor calibration system and gas sensor calibration method thereof |
| CN106018223A (en) * | 2016-05-24 | 2016-10-12 | 深圳市蜂联科技有限公司 | Method for improving measurement precision of air quality detection equipment by segmentation optimal calibration |
| CN106574898A (en) * | 2014-10-31 | 2017-04-19 | 松下知识产权经营株式会社 | Particle detection sensor |
| CN106680426A (en) * | 2015-11-11 | 2017-05-17 | 天津市宝润泽化工有限公司 | Tail gas detection device |
| TWM574228U (en) * | 2018-08-30 | 2019-02-11 | 研能科技股份有限公司 | Mobile device having particle detecting module |
-
2019
- 2019-03-15 CN CN201910196520.7A patent/CN111693416A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04337446A (en) * | 1991-05-15 | 1992-11-25 | Hitachi Ltd | Method and device for measuring fine grain and constant quantity method |
| DE69427743T2 (en) * | 1993-12-22 | 2001-11-15 | Johnson & Johnson Clinical Diagnostics, Inc. | Method for recalibrating an analyzer |
| CN103399123A (en) * | 2013-07-12 | 2013-11-20 | 河南汉威电子股份有限公司 | Automatic gas sensor calibration system and gas sensor calibration method thereof |
| CN106574898A (en) * | 2014-10-31 | 2017-04-19 | 松下知识产权经营株式会社 | Particle detection sensor |
| CN106680426A (en) * | 2015-11-11 | 2017-05-17 | 天津市宝润泽化工有限公司 | Tail gas detection device |
| CN106018223A (en) * | 2016-05-24 | 2016-10-12 | 深圳市蜂联科技有限公司 | Method for improving measurement precision of air quality detection equipment by segmentation optimal calibration |
| TWM574228U (en) * | 2018-08-30 | 2019-02-11 | 研能科技股份有限公司 | Mobile device having particle detecting module |
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