CN111693416A - Method for determining particle measurement standard of particle detection device - Google Patents

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

Particle measurement standard determination method for particle detection device

technical field

The present invention relates to a particle measurement standard determination method of a particle detection device, in particular to a particle measurement standard determination method implemented by a particle detection device that uses a micropump to introduce gas and cooperate with a particle detection module for monitoring.

Background technique

In recent years, the problem of gas pollution has become more and more serious. How to avoid various pollutants in the gas from harming health has gradually become a topic that the public pays attention to. Common air pollutants include suspended particulates (for example: PM 2.5). Suspended particulates refer to solid particles or droplets contained in the gas. Because of their very fine particle size, they can easily enter the lungs of the human body through the nose hairs in the nasal cavity. As a result, lung inflammation, asthma or cardiovascular disease are caused. If other pollutants adhere to the suspended particles, it will aggravate the harm to the respiratory system. The concentration data of fine suspended particles is often too high, and the monitoring of the concentration of gas suspended particles is getting more and more attention. However, because the gas will flow with the wind direction and the air volume in an indeterminate amount, most of the gas quality monitoring stations for detecting suspended particles are fixed points, so it is fundamental The concentration of suspended particulates in the surrounding cannot be confirmed, so a miniature and portable particle detection device is needed for the user to detect the concentration of suspended particulates in the surrounding at any time and any place.

The current particle detection device is a device that immediately alerts the user when it detects that suspended particles (eg, PM 2.5) in the environment reach a dangerous level. Because the current detection technology has the problem of detection accuracy under the condition of small size of the device, how to achieve high detection accuracy, there is still room for improvement for real-time and accurate detection, so the present invention provides a particle detection method. The particle measurement standard determination method of the device is used to solve the problem of detection accuracy.

SUMMARY OF THE INVENTION

The present invention provides a particle measurement standard determination method of a particle detection device. The method utilizes the particle measurement standard determination method of the particle detection device, and uses the micro pump to implement stable air conduction in an intermittent operating mode. The detection component adopts the delayed detection reading method to capture a stable suspended particle count for detection, so as to provide a more stable and accurate detection standard judgment, and the suspended particle count detected by the detection component is multi-block high and low concentration. The standard judgment of parameters enables the microprocessor to compare and calculate the suspended particle count according to the high and low concentration parameters of multiple blocks, so as to convert and output the suspended particle concentration, so as to achieve the effect of quickly and accurately measuring the concentration of gas suspended particles.

The particle measurement standard determination method of the particle detection device of the present invention includes the following steps: providing a particle detection device for detecting suspended particles in gas, including detecting suspended particles with a detection component and a micro pump; the micro pump adopts an intermittent The detection part adopts a delayed detection reading method to capture a stable suspended particle count for detection; and the suspended particle count detected by the detection part is detected by a multi-block The standard determination of the high and low concentration parameters enables the microprocessor to compare and calculate the suspended particle count according to the high and low concentration parameters of multiple blocks, so as to convert and output the suspended particle concentration.

Description of drawings

FIG. 1 is a schematic diagram of the appearance of the particle detection device of the present invention.

FIG. 2 is a schematic diagram of the exploded structure of the relevant components of the particle detection device of the present invention.

FIG. 3 is a schematic diagram of the base structure of the particle detection device of the present invention.

FIG. 4 is a schematic diagram of the implementation of the gas guide and the light source projection when the particle detection device of the present invention detects particles.

FIG. 5 is a schematic diagram showing the intermittent operation mode of the micropump of the particle detection device of the present invention.

FIG. 6 is a schematic diagram of intermittent concentration counting detected by the particle detection device of the present invention.

FIG. 7 is a schematic diagram showing the standard determination of the suspended particle count and the actual gas concentration detected by the particle detection device of the present invention.

FIG. 8 is a step diagram of a method for determining a particle measurement standard of the particle detection device of the present invention.

Description of reference numerals

1: Base

1a: first surface

1b: second surface

11: Detect component bearing area

12: Micro pump bearing area

121: Holder frame slot

122: Intake port

123: exhaust port

13: Detection channel

14: Beam channel

15: Light Trap Zone

2: Detecting parts

21: Microprocessor

22: Particulate sensor

23: Laser

3: Micro pump

4: Drive control board

5: Outer cover plate

5a: Upper cover plate

51a: Intake inlet

52a: Exhaust outlet

5b: Lower cover plate

51b: Air intake opening

52b: Exhaust opening

L: Projection light source

S1-S4: Steps

Detailed ways

Embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different aspects without departing from the scope of the present invention, and the descriptions and drawings therein are essentially used for illustration rather than for limiting the present invention .

Please refer to FIG. 1 to FIG. 4 , the present application provides a particle detection device, which includes a base 1 , a detection component 2 , a micro pump 3 , a drive control board 4 and an outer cover member 5 . The above-mentioned base 1 has a first surface 1a and a second surface 1b, the first surface 1a and the second surface 1b are two opposite surfaces, and a detection component bearing area 11 and a micro pump bearing area are divided inside. area 12 , a detection channel 13 , a beam channel 14 and a light trap area 15 . The detection channel 13 and the beam channel 14 are set at orthogonal positions, and the beam channel 14 penetrates the detection channel 13 orthogonally and is connected to the light trap area 15 . The driving control board 4 is covered on the second surface 1b of the base 1, and the detection channel 13 is covered to form a straight gas flow path. The detection component 2 is packaged and positioned on the drive control board 4 and electrically connected thereto, and is disposed in the detection component bearing area 11 . The micro pump 3 is electrically connected with the driving control board 4 to be driven to operate (not shown). A receiving frame groove 121 and an air inlet 122 are arranged at the bottom of the micro-pump bearing area 12 , and an air outlet 123 is arranged on one side of the top to communicate with the outside. The air inlet 122 is communicated between the detection channel 13 and the receiving frame groove 121 , and the micro pump 3 is supported and positioned on the receiving frame groove 121 . The micro-pump 3 can generate a suction force on the detection channel 13 which is connected with the bearing frame slot 121 when it is driven to operate, and the gas outside the detection channel 13 is introduced into the detection channel 13, and then the gas is introduced into the bearing through the transmission of the micro-pump 3. It is placed above the frame groove 121, and then discharged to the outside through the exhaust port 123 to complete the guidance of the gas detection (the path guidance indicated by the arrow in FIG. 4). In addition, the detection unit 2 includes a microprocessor 21 , a particle sensor 22 and a laser 23 . The microprocessor 21 , the particle sensor 22 and the laser 23 are packaged on the drive control board 4 . The laser 23 is correspondingly disposed in the detection component carrying area 11 , and can emit the projection light source L in the beam channel 14 . The particle sensor 22 is correspondingly set to the orthogonal position of the detection channel 13 and the beam channel 14, so the microprocessor 21 can control the driving operation of the laser 23 and the particle sensor 22, so that the projection light source L of the laser 23 irradiates the beam channel 14 and passes through The detection channel 13 is orthogonal to the beam channel 14, so as to illuminate the suspended particles (for example: PM2.5) contained in the gas passing through the detection channel 13, and can make the suspended particles contained in the irradiated gas generate projection light spots, so as to Projection is performed on the particle sensor 22 for detection calculation. The particle sensor 22 can detect the suspended particles contained in the gas and output the detection signal, and the microprocessor 21 receives the detection signal output by the particle sensor 22 and performs calculation to analyze the size and concentration of the suspended particles contained in the gas, and output the detection data . The above-mentioned outer cover member 5 includes an upper cover member 5a and a lower cover member 5b. The upper cover 5a covers the first surface 1a of the base 1, and an air inlet 51a is provided at a position corresponding to the outer air inlet end of the detection channel 13 of the base 1, corresponding to the exhaust port of the micro-pump carrying area 12 The position 123 also has an exhaust outlet 52a. The lower cover 5b covers the second surface 1b of the base 1, and is fitted with the upper cover 5a to seal the base 1, and an inlet 51a is provided corresponding to the area of the upper cover 5a. The air opening 51b is provided with an air outlet 52b corresponding to the area of the air outlet 52a of the upper cover plate 5a. In this way, the gas outside the particle detection device can be introduced into the detection channel 13 of the base 1 through the air inlet 51b and the air inlet 51a, and the gas in the detection channel 13 of the base 1 can be exhausted from the exhaust port 123 of the micro-pump bearing area 12. , and then discharged to the outside of the particle detection device through the exhaust outlet 52a and the exhaust opening 52b.

It can be seen from the above description that the particle detection device provided in this application is specifically implemented to measure suspended particles, and the particle measurement standard determination method is shown in FIG. 8 , and the steps are described in detail as follows.

First, in step S1, a particle detection device is provided to detect suspended particles in the gas, including a detection component and a micro pump to detect suspended particles. As shown in FIG. 1 to FIG. 4 , the particle detection device provided in this application is composed of a base 1 , a detection part 2 , a micro pump 3 , a driving control board 4 and an outer cover plate 5 as described above. When the pump 3 is driven to operate, the micro-pump 3 generates a suction force on the detection channel 13 connected to the receiving frame groove 121, and introduces the external gas of the detection channel 13 into the detection channel 13, and then the micro-pump 3 introduces the gas into the bearing. It is placed above the frame groove 121 and discharged to the outside through the exhaust port 123 to complete the guide and transmission of the gas detection (guided by the path indicated by the arrow in FIG. 4 ). The microprocessor 21 controls the driving operation of the laser 23 and the particle sensor 22, so that the projection light source L of the laser 23 irradiates the beam channel 14 and passes through the detection channel 13 and the beam channel 14 at an orthogonal position to illuminate the gas passing through the detection channel 13. The contained suspended particles (for example: PM2.5) can generate projection light spots for the suspended particles contained in the irradiated gas to project on the particle sensor 22 for detection and calculation. The particle sensor 22 can detect the suspended particles contained in the gas and output the detection signal, and the microprocessor 21 receives the detection signal output by the particle sensor 22 and performs calculation to analyze the size and concentration of the suspended particles contained in the gas, and output the detection data , to complete the detection of suspended particles. In this way, the particle detection device provided in this case can be constructed into a miniaturized volume with a length of 30 mm, a width of 30 mm and a height of 50 mm, and is applied and assembled on a portable electronic device to form a mobile particle detection device.

In step S2, the micro-pump adopts an intermittent operation mode to implement stable air-conducting transmission. The above-mentioned particle detection device uses the micro-pump 3 to guide the gas to speed up the detection efficiency of the external gas. However, when the micro-pump 3 is used, it requires a larger driving voltage, larger operating current and smaller gas flow. Therefore, when the micro-pump 3 is used 3 When directing gas into the particle detection device, use the intermittent duty mode of operation. As shown in FIG. 5 , the micro-pump 3 uses an intermittent operation mode, with a periodic operation mode of 10 seconds to operate (ON) and 20 seconds to turn off (OFF), so as to achieve the effect of energy saving, and at the same time, it can improve the life of the micro pump 3 .

In step S3, the detection component adopts a delayed detection reading method to capture a period of stable suspended particle counts for detection. The above particle detection device uses the laser 23 to match the particle sensor 22, and uses the Mie scattering principle to generate scattered light from the laser light spot by the gas aerosol and make it enter the particle sensor 22 to calculate the number and size of the gas aerosol. discriminate. However, when the micro-pump 3 operates in the intermittent operation mode, it takes a period of time for the air flow to stabilize when the micro-pump 3 guides the gas into the particle detection device, and if the standard determination of suspended particle counting is performed at this time, the counting will be unstable. (As shown in Figure 6, the circle B area). Therefore, after a period of time (for example, after the micro-pump 3 operates for 3 seconds), the gas reaches a stable gas flow rate in the flow channel (as shown in the circle A area in FIG. 6 ), and then the detection is performed. Sensor 22 can then detect stable aerosol counts. In this way, the particle sensor 22 of the particle detection device is matched with the delayed detection reading method, so that a more stable and accurate detection standard can be determined.

In step S4, the suspended particle count detected by the detection component is subjected to standard determination of multi-block high and low concentration parameters, so that the microprocessor compares and calculates the suspended particle count according to the multi-block high and low concentration parameters to convert and output suspended particles concentration. The particle sensor 22 of the particle detection device of the present case performs the actual detection of the suspended particle count under the optical scattering reaction, and then performs the actual detection comparison with the actual gas concentration in the same environment. As shown in Figure 7, the actual detection diagram of the suspended particle count and the actual gas concentration (PM2.5 concentration) is compared. The curve is obtained from the results of 61 tests. The particle counts showed very good consistency, but when comparing the concentration standards, it was found that there would be large deviations at low concentrations. Since the microprocessor 21 compares and calculates the aerosol count according to the parameters of a segment, the obtained gas aerosol concentration will have a large error rate, so the standard judgment of the air aerosol concentration and the aerosol count in this case is to distinguish as 2 Block, block 1 is used as the standard judgment of suspended particle count higher than 50, and the high concentration parameter comparison operation is performed, and block 2 is used as the standard judgment of suspended particle count lower than 50, and the low concentration parameter comparison operation is performed, prompting the microprocessor 21 The standard determination of suspended particle count is performed by multi-block comparison operation of high and low concentration parameters, and converted into a correction operation that is closer to the actual gas concentration. For the suspended particle count determined by the zoning standard, the converted suspended particle concentration error rate can be less than 10%, so that the particle detection device in this case can quickly and accurately measure the concentration of gas suspended particles.

To sum up, the particle measurement standard determination method of the particle detection device provided by the present invention utilizes the micro pump to implement stable air-conducting transmission in an intermittent operation mode, and makes the detection component adopt a delayed detection reading method, A period of stable suspended particle count is captured for detection to provide a more stable and accurate detection standard judgment, and the suspended particle count detected by the detection component is subjected to multi-block standard judgment of high and low concentration parameters, so that the microprocessor can detect suspended particles. Counting is based on the comparison of high and low concentration parameters in multiple blocks to convert and output the concentration of suspended particulates, so as to quickly and accurately measure the concentration of suspended particulates in gas for industrial use.

The present invention can be modified in various ways by those who are familiar with the technology, but all of them do not deviate from those intended to be protected by the scope of the appended patent application.

Claims (3)

1. A particle measurement standard determination method for a particle detection device, wherein the steps comprise: a. Provide a particle detection device to detect suspended particles in the gas, including a detection component and a micro pump to detect suspended particles; b. The micro-pump adopts an intermittent working operation mode to implement stable air-conducting transmission; c. The detection component adopts a delayed detection reading method to capture a stable aerosol count for detection; and d. The suspended particle count detected by the detection component is subjected to a standard determination of multi-block high and low concentration parameters, so that a microprocessor compares and calculates the suspended particle count according to the multi-block high and low concentration parameters to convert the output suspension particle concentration. 2 . The particle measurement standard determination method of the particle detection device as claimed in claim 1 , wherein the intermittent operation mode is a periodic operation mode in which the micro pump operates for 10 seconds and turns off for 20 seconds. 3 . 3 . The particle measurement standard determination method of the particle detection device as claimed in claim 1 , wherein the standard determination area of the multi-block high and low concentration parameters is divided into two blocks, and block 1 is used as the suspended particle count higher than 2. 4 . The standard judgment of 50 enables the microprocessor to perform high-concentration parameter comparison operation, and block 2 is used as the standard judgment that the suspended particle count is lower than 50, and enables the microprocessor to perform low- and high-density parameter comparison operation.

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