KR102103080B1 - Particle measurement system and measurement method therefor - Google Patents

Abstract

In a particle measurement system comprising a processing device, the processing device comprises: a delay time calculator which uses a first detection signal outputted from a first particle detector detecting particles and a second detection signal outputted from a second particle detector detecting particles, to calculate a detection delay time between the first detection signal and the second detection signal with respect to one particle; and a peak value calculator which calculates a detection peak value for the particle by using at least one of the first detection signal and the second detection signal. According to the particle measuring system and the measuring method of the present invention, the weight of dust particles can be calculated by measuring the size and density of dust particles.

Description

Particle measurement system and its measurement method {PARTICLE MEASUREMENT SYSTEM AND MEASUREMENT METHOD THEREFOR}

The present invention relates to a particle measuring system and a measuring method thereof, and more particularly, to a particle measuring system and a measuring method capable of calculating the total weight of dust particles detected for a certain period of time.

Recently, the atmospheric environment is deteriorating day by day due to yellow dust and various fine dust. In general, air quality is expressed by the concentration of fine dust and ultra fine dust. However, these fine dust and ultra-fine dust are not only difficult to measure the particle size, but even if the particle size is the same, the degree of influence on the atmospheric environment varies depending on the density.

Therefore, it is necessary to measure the weight of the dust particles in order to measure the atmospheric environment such as more accurate air quality.

1. Domestic registered patent No. 10-1606561: Dust particle measurement method and dust particle measurement device (announced on March 25, 2016).

The present invention is to provide a particle measuring system and a measuring method capable of calculating the weight of the dust particles by measuring the size and density of the dust particles, as an invention aimed at solving the technical problems as described above. It has a purpose.

In the particle measurement system including the processing apparatus of the present invention, the processing apparatus includes a first detection signal output from a first particle detector that detects particles and a second detection signal output from a second particle detector that detects particles A delay time calculator for calculating a detection delay time between the first detection signal and the second detection signal for one particle; A peak value calculator for calculating a detection peak value for the particle by using at least one of the first detection signal and the second detection signal; And a weight calculator for each particle that calculates a weight for the particle using the detection delay time and the detection peak value.

In addition, it is preferable that the processing apparatus further includes a total weight calculator for summing the weight of each particle calculated for a plurality of particles for a predetermined period of time.

In addition, the detection peak value includes: a first peak value that is a peak value among the first detection signals detected for the particle; A second peak value that is a peak value among the second detection signals detected for the particle; And an average value of the first peak value and the second peak value. It is characterized by being one of.

Preferably, the delay time calculator is the first time at which the first peak value, which is the peak value among the first detection signals detected for the particle, and the second that is the peak value of the second detection signals detected for the particles. It is characterized in that the difference value of the second time at which the peak value is detected is calculated as the detection delay time. Specifically, the delay time calculator detects the M second detection signals for the corresponding particles stored in the N second shifter registers, respectively, and the M first detections for the corresponding particles stored in the first shifter registers. Among signals, multiplies the value of the position corresponding to the second shifter register, sums the multiplied M values for the second shifter register, and calculates a sum value, and the largest sum value among the N second shifter registers It is characterized in that the position of the second peak value in the second detection signal stored in the calculated second shift register is set to the second time.

The particle measurement method of the present invention uses the first detection signal output from the first particle detector to detect the particles and the second detection signal output from the second particle detector to detect the particles. A delay time calculation step of calculating a detection delay time between the first detection signal and the second detection signal; A peak value calculation step of calculating a detection peak value for the particle by using at least one of the first detection signal and the second detection signal; A weight calculation step for each particle to calculate a weight for the particle by using the detection delay time calculated in the delay time calculation step and the detection peak value calculated in the peak value calculation step; And a total weight calculation step of summing the weight of each particle calculated for a plurality of particles for a predetermined period of time.

Specifically, the detection peak value includes: a first peak value that is a peak value among the first detection signals detected for the particle; A second peak value that is a peak value among the second detection signals detected for the particle; And an average value of the first peak value and the second peak value. It is preferably one of.

In addition, the step of calculating the delay time includes: the first time at which the first peak value, which is the peak value among the first detection signals detected for the particle, is detected, and the second, which is the peak value among the second detection signals detected for the particles, It is characterized in that the difference value of the second time at which the peak value is detected is calculated as the detection delay time. Specifically, in the calculating of the delay time, the M second detection signals detected for the respective particles stored in the N second shifter registers are respectively detected, and the M first detection values for the corresponding particles stored in the first shifter register are respectively obtained. Multiplying a value of a position corresponding to the second shift register among the detection signals; Summing the multiplied M values for the second shifter register to calculate a sum value; And setting the position of the second peak value in the second detection signal stored in the second shift register in which the largest sum value of the N second shifter registers is calculated to be the second time. .

According to the particle measurement system and the measuring method of the present invention, the weight of the dust particles can be calculated by measuring the size and density of the dust particles.

1 is a block diagram of a particle measurement system according to an embodiment of the present invention.
Figure 2 is an illustration of the installation of the first particle detector and the second particle detector.
3 is an explanatory diagram of a method for calculating a detection delay time by a delay time calculator.
4 is an explanatory diagram of a method for calculating a specific detection delay time by a delay time calculator.
5 is a flow chart of a particle measurement method according to a preferred embodiment of the present invention.

Hereinafter, a particle measuring system and a measuring method according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It goes without saying that the following examples of the present invention are only intended to embody the present invention and do not limit or limit the scope of the present invention. From the detailed description and examples of the present invention, what can be easily inferred by experts in the technical field to which the present invention pertains is interpreted as belonging to the scope of the present invention.

First, FIG. 1 shows a configuration diagram of a particle measurement system 100 according to a preferred embodiment of the present invention.

As can be seen from FIG. 1, a particle measurement system 100 according to a preferred embodiment of the present invention includes a first particle detector 10, a second particle detector 20 and a processing device 30. .

The first particle detector 10 and the second particle detector 20 are general particle detectors, including an optical sensor that detects scattered light, and preferably converts the detected light into an electrical signal and outputs it.

That is, the first particle detector 10 detects light and outputs a first detection signal D1, and the second particle detector 20 detects light and outputs it in the form of a second detection signal D2. .

2 is an example of installation of the first particle detector 10 and the second particle detector 20.

As can be seen from FIG. 2, the first particle detector 10 and the second particle detector 20 are arranged side by side in the passage wall of air between the inlet IN through which the dust particles flow in and the inlet OUT through the dust particles. It is preferably installed in the direction of air flow.

In addition, it is necessary to illuminate the passage of air by the light source L near the inlet IN. The scattered light by the light source L is detected by the first particle detector 10 and the second particle detector 20.

However, the first particle detector 10 and the second particle detector 20 are installed in close proximity, so that the particles first detected by the first particle detector 10 are also detected first in the second particle detector 20. . That is, it is assumed that the order of particles detected by the first particle detector 10 and the second particle detector 20 is the same.

The processing device 30 is connected to the first particle detector 10 and the second particle detector 20 by wired or wireless communication, and receives the first detection signal D1 and the second detection signal D2. By processing, it serves to calculate the total weight of the dust particles detected by the first particle detector 10 and the second particle detector 20 for a period of time.

The processing apparatus 30 may include a delay time calculator 31, a peak value calculator 32, a particle-specific weight calculator 33, and a total weight calculator 34. The processing device 30 may be implemented using a computing device including a processor.

The delay time calculator 31 uses the first detection signal D1 and the second detection signal D2, between the first detection signal D1 and the second detection signal D2 for one particle. It serves to calculate the detection delay time. That is, the detection delay time refers to a delay time until the same particle is detected by the second detection signal D2 after being detected by the first detection signal D1, and the first detection signal for the same particle ( It can be calculated using the detection time difference between D1) and the second detection signal D2.

3 shows an explanatory diagram of a method for calculating the detection delay time by the delay time calculator 31.

That is, the delay time calculator 31 includes the first time at which the first peak value, which is the peak value among the M first detection signals D1 detected for the particle, and the M number detected for the particle. The difference value between the second time at which the second peak value, which is the peak value among the 2 detection signals D2, is detected is calculated as the detection delay time.

In addition, as can be seen from Figure 3, even if the particles of the same size, the detection delay time varies depending on the density of the particles. That is, as the density of the particles increases, the moving speed of the particles becomes slower, and the detection delay time becomes larger.

In FIG. 3, the density increases in the order of the first particle P1, the second particle P2, and the third particle P3, and accordingly, the detection delay time is also the detection delay time T1 of the first particle P1. , In the order of the detection delay time T2 of the second particle P2 and the detection delay time T3 of the third particle P3.

In summary, the detection delay time and particle density are proportional.

For reference, since the particle size is the same as the first particle P1 and the third particle P3, and the second particle P2 is the largest, the detection peak value is the second particle P2 the largest. .

4 shows an explanatory diagram of a method of calculating a specific detection delay time by the delay time calculator 31.

First, it is preferable to store the M first detection signals D1 detected for the particles in a first shift register of a predetermined size. In this case, it is preferable that the first shift register stores the M first detection signals D1 detected for the particle together with time information measured in the form of first-in first-out (FIFO).

In addition, the M second detection signals D2 detected for the particles are stored in the second shift register. However, in order to match with the first detection signal D1, the position of the first peak value from the measurement start time of the corresponding particle of the first particle detector 10 and the time of measurement of the corresponding particle of the second particle detector 20 It is necessary to ensure that the positions of the second peak values have the same time difference.

That is, if the position of the second peak value cannot match the position of the first peak value, it is difficult to calculate the accurate detection delay time.

If the position of the second peak value coincides with the position of the first peak value, multiplied by the corresponding second detection signal D2 and the first detection signal D1, that is, the multiplied value does not match. It is desirable to use a growing feature.

That is, the delay time calculator 31 detects the M second detection signals D2 for the corresponding particles stored in the N second shifter registers, respectively, for the corresponding particles stored in the first shifter register. Among the M first detection signals D1, the value of the position corresponding to the second shifter register is multiplied. After multiplication, the delay time calculator 31 sums the multiplied M values with respect to the second shift register to calculate the sum value. Finally, the delay time calculator 31 determines the time at which the second peak value in the second detection signal D2 stored in the second shift register that calculated the largest sum value among the N second shift registers is detected. It is set to the second time. Accordingly, the detection delay time is calculated by subtracting from the second time the first time at which the first peak value, which is the peak value of the first detection signal D1 stored in the first register, is detected.

For example, suppose that five first detection signals D1 of R11 to R16 are stored in the first register.

In addition, five second detection signals D2 of R21 (1) to R25 (1) are stored in the first second register, and five of R21 (2) to R25 (2) are stored in the second second register. Suppose that the second detection signal D2 is stored, and the five second detection signals D2 of R21 (3) to R25 (3) are stored in the third third register. That is, suppose that N is 3 and M is 5.

The delay time calculator 31 adds up to the first second register A (1) = R11 x R21 (1) + R12 x R22 (1) + R13 x R23 (1) + R14 x R24 (1) Calculate + R15 × R25 (1), and the sum A (2) = R11 × R21 (2) + R12 × R22 (2) + R13 × R23 (2) + R14 × R24 ( 2) Calculate + R15 × R25 (2), and the sum A (3) = R11 × R21 (3) + R12 × R22 (3) + R13 × R23 (3) + R14 × for the third second register R24 (3) + R15 x R25 (3) is calculated. If the value of A (2) is the largest, the peak at the position where R23 (2), which is the peak value of the second detection signal D2 at the position of A (2), matches the first detection signal D1. It becomes the value. The time at which R23 (2) was detected is set as the second time. Finally, the detection delay time is calculated by subtracting the first time at which the peak value R13 of the first detection signal D1 stored in the first register is detected from the second time.

However, since the values stored in the N second registers may overlap some detection times, the same detection values may be stored in different locations of different second registers. For example, R24 (1) of the first second register has the same value as R21 (2) of the second second register, and R25 (1) of the first second register is R22 (1) of the second second register. It will have the same value as 2). In addition, R24 (2) of the second second register has the same value as R21 (3) of the third second register, and R25 (2) of the second second register is R22 (3) of the third second register. It has the same value as.

The peak value calculator 32 calculates the detection peak value for the particle using at least one of the first detection signal D1 and the second detection signal D2.

Specifically, the detection peak value includes: a first peak value that is a peak value among the M first detection signals D1 detected for the particle; A second peak value which is a peak value among the M second detection signals D2 detected for the particle; And an average value of the first peak value and the second peak value; It is characterized by being one of.

As the detection peak value, only one of the first detection signal D1 and the second detection signal D2 may be used, or the average value of the two signals may be used.

The particle-specific weight calculator 33 calculates the weight of the particles by using the detection delay time calculated by the delay time calculator 31 and the detection peak value calculated by the peak value calculator 32. .

In general, the detection delay time is proportional to the density of the particle, and the amplitude, which is the detection peak value, is proportional to the size of the particle, which is used to calculate the weight for the particle.

However, it is necessary to multiply the detection delay time proportional to the density by the proportional factor using the first stored lookup table or the preset first proportional coefficient. Similarly, it is necessary to multiply the proportional factor for the particle size proportional to the detected peak value by using the second pre-stored look-up table or the preset second proportional coefficient.

The total weight calculator 34 serves to sum the weight of each particle calculated for a plurality of particles for a predetermined period of time. The value added by the total weight calculator 34 becomes a value for calculating the final total concentration of dust.

5 is a flowchart of a particle measurement method according to an exemplary embodiment of the present invention. Particle measurement method according to a preferred embodiment of the present invention uses the particle measurement system 100 according to the preferred embodiment of the present invention described above, so that all features of the particle measurement system 100, even if not otherwise described Of course it does.

Specifically, the particle measurement method according to an exemplary embodiment of the present invention is implemented in the form of a computer program, and may be implemented in a computing device including a processor.

As can be seen from FIG. 5, the particle measurement method according to the preferred embodiment of the present invention includes: a first detection signal D1 output from the first particle detector 10 for detecting particles and a particle detection agent Delay time for calculating the detection delay time between the first detection signal D1 and the second detection signal D2 for one particle by using the second detection signal D2 output from the two particle detector 20 Calculating step (S10); A peak value calculation step (S20) of calculating a detection peak value for the particle by using at least one of the first detection signal D1 and the second detection signal D2; A weight calculation step for each particle to calculate the weight for the particle by using the detection delay time calculated in the delay time calculation step S10 and the detection peak value calculated in the peak value calculation step S20; It characterized in that it comprises; a total weight calculation step (S40) for summing the weight for each particle calculated in each particle weight calculation step (S30) for a predetermined time for a predetermined time.

The detected peak value in the peak value calculation step (S20) includes: a first peak value that is a peak value among the M first detection signals D1 detected for the particle; A second peak value which is a peak value among the M second detection signals D2 detected for the particle; And an average value of the first peak value and the second peak value; It is characterized by being one of.

In addition, the delay time calculation step (S10) includes: the first time at which the first peak value, which is the peak value among the M first detection signals D1 detected for the particle, and the M second detected for the particle; It is preferable to calculate the difference value between the second time when the second peak value, which is the peak value among the detection signals D2, is detected as the detection delay time.

Specifically, the delay time calculation step (S10), each of the M second detection signal (D2) detected for each particle stored in each of the N second shifter registers, respectively, detected for the particles stored in the first shifter register Multiplying the value of the position corresponding to the corresponding second shifter register among the M first detection signals D1 (S11); Calculating a sum value by summing the multiplied M values for the second shift register (S12); Setting the position of the second peak value in the second detection signal D2 stored in the second shift register, which has calculated the largest sum of the N second shifter registers, to the second time (S13); And calculating a difference value between the first time and the second time (S14).

As described above, according to the particle measurement system 100 of the present invention and its measurement method, it can be seen that the weight of the dust particles can be calculated by measuring the size and density of the dust particles.

100: particle measurement system
10: first particle detector
20: second particle detector
30: processing unit
31: Delay time calculator
32: peak value calculator
33: weight calculator for each particle
34: total weight calculator

Claims (12)

In the particle measurement system comprising a processing device,
The processing device,
The first detection signal and the second detection for one particle by using the first detection signal output from the first particle detector detecting particles and the second detection signal output from the second particle detector detecting particles Includes; delay time calculator for calculating the detection delay time between the signals,
The delay time calculator,
Of the first time that the first peak value, which is the peak value among the first detection signals detected for the particle, is detected, and the second time that the second peak value, which is the peak value of the second detection signals detected for the particle, is detected. The difference value is calculated as the detection delay time,
The delay time calculator,
Each of the M second detection signals detected for the corresponding particles stored in the N second shifter registers corresponds to the corresponding second shifter register among the M first detection signals detected for the corresponding particles stored in the first shifter register. Stored in the second shift register which multiplies the value of the position and multiplies M values multiplied by the second shift register to calculate the sum value, and calculates the largest sum value among the N second shift registers. The particle measurement system, characterized in that the position of the second peak value in the second detection signal is set to the second time. According to claim 1,
The processing device,
A peak value calculator for calculating a detection peak value for the particle by using at least one of the first detection signal and the second detection signal; And
Particle measurement system characterized in that it further comprises; by using the detection delay time and the detection peak value, a particle-specific weight calculator for calculating the weight for the particle. According to claim 2,
The processing device,
Particle measurement system characterized in that it further comprises a; total weight calculator for summing the weight of each particle calculated for a plurality of particles for a predetermined time period. According to claim 2,
The detection peak value,
A first peak value that is a peak value among the first detection signals detected for the particle;
A second peak value that is a peak value among the second detection signals detected for the particle; And
An average value of the first peak value and the second peak value; Particle measurement system, characterized in that one. delete delete In the particle measurement method,
The first detection signal and the second detection for one particle by using the first detection signal output from the first particle detector detecting particles and the second detection signal output from the second particle detector detecting particles Includes; calculating the delay time for calculating the detection delay time between the signals,
The delay time calculation step,
Of the first time that the first peak value, which is the peak value among the first detection signals detected for the particle, is detected, and the second time that the second peak value, which is the peak value of the second detection signals detected for the particle, is detected. The difference value is calculated as the detection delay time,
The delay time calculation step,
Each of the M second detection signals detected for the corresponding particles stored in the N second shifter registers corresponds to the corresponding second shifter register among the M first detection signals detected for the corresponding particles stored in the first shifter register. Multiplying the value of the location to be played; Summing the multiplied M values for the second shifter register to calculate a sum value; And setting the position of the second peak value in the second detection signal stored in the second shift register, which has calculated the largest sum of the N second shifter registers, to the second time. Particle measurement method. The method of claim 7,
The particle measurement method,
A peak value calculation step of calculating a detection peak value for the particle by using at least one of the first detection signal and the second detection signal; And
It characterized in that it further comprises a; by using the detection delay value calculated in the delay time calculation step and the detection peak value calculated in the peak value calculation step, to calculate the weight for the particle; Particle measurement method. The method of claim 8,
The particle measurement method,
Particle measurement method further comprising; a total weight calculation step of summing the weight of each particle calculated for a plurality of particles for a predetermined period of time. The method of claim 8,
The detection peak value,
A first peak value that is a peak value among the first detection signals detected for the particle;
A second peak value that is a peak value among the second detection signals detected for the particle; And
An average value of the first peak value and the second peak value; Particle measurement method, characterized in that one. delete delete

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