CN109253953B - Method and system capable of measuring mass concentration of various particles - Google Patents
Method and system capable of measuring mass concentration of various particles Download PDFInfo
- Publication number
- CN109253953B CN109253953B CN201710571323.XA CN201710571323A CN109253953B CN 109253953 B CN109253953 B CN 109253953B CN 201710571323 A CN201710571323 A CN 201710571323A CN 109253953 B CN109253953 B CN 109253953B
- Authority
- CN
- China
- Prior art keywords
- photoelectric sensor
- particles
- measured
- measuring
- voltage threshold
- Prior art date
- 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.)
- Active
Links
- 239000002245 particle Substances 0.000 title claims abstract description 129
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005259 measurement Methods 0.000 claims abstract description 61
- 235000019504 cigarettes Nutrition 0.000 claims description 12
- 239000013618 particulate matter Substances 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 29
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 238000000691 measurement method Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 238000000149 argon plasma sintering Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000005250 beta ray Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000790 scattering method Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 206010058467 Lung neoplasm malignant Diseases 0.000 description 1
- 208000028571 Occupational disease Diseases 0.000 description 1
- 206010035664 Pneumonia Diseases 0.000 description 1
- 206010057190 Respiratory tract infections Diseases 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 208000006673 asthma Diseases 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 201000005202 lung cancer Diseases 0.000 description 1
- 208000020816 lung neoplasm Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 231100000915 pathological change Toxicity 0.000 description 1
- 230000036285 pathological change Effects 0.000 description 1
- 206010035653 pneumoconiosis Diseases 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides a method capable of measuring mass concentration of various particles, which comprises the following steps: obtaining a large number of particles with a set diameter, obtaining a gas to be measured containing the particles, and measuring the particles in the gas to be measured by a photoelectric sensor to obtain a corresponding measured value and a voltage threshold value corresponding to the set diameter; calculating voltage thresholds corresponding to other diameters; setting voltage thresholds for measuring different particle diameters for the photoelectric sensor; measuring the mass concentration of all particulate matters with the diameter less than or equal to a set diameter in the gas to be measured by a standard instrument, measuring the gas to be measured by a photoelectric sensor according to the voltage threshold value corresponding to the particles with the set diameter to obtain a signal value, and calculating the measurement parameter of the photoelectric sensor according to the mass concentration and the signal value; and setting the photoelectric sensor by using the measurement parameters, and measuring the mass concentration of different particles by using the photoelectric sensor by combining the previously calculated voltage threshold values corresponding to the diameters of different particles.
Description
Technical Field
The invention belongs to the technical field of environmental monitoring, and particularly relates to a method and a system for measuring mass concentration of particulate matters.
Background
With the growth and industrial development of urban population, such as industrial boilers, kilns, motor vehicles, interior decoration and the like, pollutant emission and suspended particulate matters in air are greatly increased, after the urban population inhales, a plurality of pathological changes, such as respiratory tract infection, asthma, pneumonia and lung cancer, can be caused, and for some production processes, such as ash discharge, furnace repair, solid fuel crushing, conveying, wood processing, wood type manufacturing and the like, field operators inhale dust with higher concentration for a long time, and if the dust is not detected and effectively prevented in time, pneumoconiosis and other occupational diseases can be caused. Therefore, the particulate matter in the air is intensively studied and controlled in various countries of the world, and commonly used detection methods include a weighing method, a beta-ray absorption method, a laser scattering method and the like.
The weighing method is a traditional method for measuring particulate matters, and utilizes the principle of aerohydrodynamics to collect the particulate matters in the air on a filter membrane with constant weight, and the weight concentration of the particulate matters is calculated according to the weight difference of the filter membrane before and after sampling and the total sampling volume. The method is a manual measurement method, the daily average concentration detection limit is low, the accuracy is high, a filter membrane can be used for component analysis, but the method has the disadvantages of large maintenance workload of a measurement instrument, complicated quality control, high labor and time consumption, high cost and heavy instrument, a working object is limited to the total mass of particles in a period of time, real-time monitoring is difficult to realize, and the method is not suitable for application in the civil field.
The beta ray absorption method is based on the fact that when beta rays pass through a measured medium, particles and electrons in the medium collide with each other to lose energy and are absorbed, the attenuation characteristic of the beta rays when the beta rays pass through a substance is measured, the method is an indirect measurement method, but the minimum value can be measured only by an hour mean value, online real-time monitoring cannot be achieved, a filter membrane cannot be used for component analysis, meanwhile, because the beta rays cannot distinguish water drops and solid particles, the working humidity condition of an instrument is usually only less than 95%, and the measurement result can be seriously influenced in a humid and rainy environment.
In order to meet the actual measurement requirements, requirements are made on repeatability, accuracy, low cost and the like of a particulate matter measuring instrument, and in recent years, with the development of technologies such as a photoelectric sensor, a signal amplifier and the like, a laser scattering method becomes the first choice of people, and the principle is as follows: light beams from the light source irradiate a certain space (measuring area) containing particles to be measured, so that scattering occurs, scattered light is converted into an electric signal through the photoelectric receiver, and after the electric signal is amplified through the amplifier, the mass concentration of particles in the measuring area can be calculated according to a light scattering theory.
The light scattering method has accurate measurement, high precision, good repeatability and high measurement speed, is an online direct-reading measurement mode, does not need sampling, and can continuously give the instantaneous value of the concentration of the particulate matters in real time; however, the light scattering method is affected by the particle size distribution, refractive index and the like of different particles, so that a prototype needs to be developed, parameters need to be calibrated timely, multiple comparison tests need to be carried out, the performance of the instrument can be conveniently checked and tested, and interference factors influencing the measurement result can be analyzed. The detecting instrument in the existing market can only realize single-channel detection, and documents are as follows: CN105092442A, which proposes a fine particle measurement device and a measurement method, which can only be used for detecting the content of particles with particle size less than 2.5 μm in air, and can not realize multi-channel detection at the same time; document CN106290091A proposes a calibration method for a laser particle mass concentration detector, which is to inject cigarettes into a sealed calibration space, stir the cigarettes uniformly with a fan, start a purifier, sample the particle content in the gas in the sealed calibration space through a laser particle counter, perform linear fitting on the sampling data of the laser particle counter and the sampling data of each detector to be determined, and write the linear fitting parameters into each specially-calibrated PM2.5 detector.
In summary, in the prior art, if multi-channel and low-cost detection is to be realized, suspended particles in air with different particle sizes in different environments need to be detected and calibrated respectively, which is limited by the purity and particle size of the particles, and changes in the types or particle size ranges of the particles can cause changes in parameter values.
Disclosure of Invention
In order to solve the above problems, it is necessary to provide a particulate matter mass concentration measurement method and system that can measure a plurality of particulate matter mass concentrations without correcting the parameter values.
A method of measuring mass concentrations of a plurality of particulate matter, comprising the steps of:
step 1: obtaining a large number of particles with a set diameter, obtaining a gas to be measured containing the particles, and measuring the particles in the gas to be measured by a photoelectric sensor to obtain a corresponding measured value and a voltage threshold value corresponding to the set diameter;
step 2: calculating voltage thresholds corresponding to other diameters according to the set diameter of the particles and the corresponding voltage threshold;
and step 3: setting voltage thresholds for measuring different particle diameters according to the calculated voltage threshold for the photoelectric sensor;
and 4, step 4: measuring the mass concentration of all particulate matters with the diameter less than or equal to a set diameter in the gas to be measured by a standard instrument, measuring the gas to be measured by a photoelectric sensor according to the voltage threshold value corresponding to the particles with the set diameter to obtain the signal value of all the particulate matters with the diameter less than or equal to the set diameter under the corresponding voltage threshold value, and then calculating the measurement parameter of the photoelectric sensor according to the mass concentration and the signal value;
and 5: and setting the photoelectric sensor by using the measurement parameters, and measuring the mass concentration of the particles with different types and diameters by using the photoelectric sensor in combination with the previously calculated voltage threshold values corresponding to the diameters of the particles with different diameters.
Preferably, in step 1, the maximum value of the voltage values corresponding to the number of samples covering the set range is taken as the voltage threshold.
Preferably, the mass concentration measured by the standard instrument is m, the signal value measured by the photoelectric sensor is Sum, and the measurement parameter K of the photoelectric sensor is m/Sum.
Preferably, the method further comprises the step of arranging different measurement channels for the photoelectric sensor, and simultaneously measuring the mass concentration of different types and different diameters of particulate matters in the different measurement channels.
Preferably, in step 1, the plurality of particles of a set diameter are generated by a standard particle generator.
Preferably, in step 1, the mass of particles of set diameter is produced by burning a cigarette.
A system capable of measuring mass concentrations of various particulate matters comprises a photoelectric sensor and a parameter correction module, wherein the parameter correction module is used for correcting measurement parameters of the photoelectric sensor before the photoelectric sensor leaves a factory or is used, and comprises a voltage threshold setting unit and a measurement parameter calculating unit; the voltage threshold setting unit obtains a voltage threshold corresponding to a set diameter according to a measured value of a measured gas including a large number of particles with the set diameter measured by the photoelectric sensor, calculates voltage thresholds corresponding to other diameters according to the set diameter of the particles and the corresponding voltage thresholds, and sets voltage thresholds for measuring different particle diameters for the photoelectric sensor according to the calculated voltage thresholds; the measurement parameter calculation unit calculates measurement parameters of the photoelectric sensor according to the mass concentration and signal values of all the particulate matters with the diameter less than or equal to a set diameter in the measured gas measured by a standard instrument and the signal values of all the particulate matters with the diameter less than or equal to the set diameter in the measured gas under the corresponding voltage threshold value, and sets the photoelectric sensor according to the measurement parameters; the photoelectric sensor can measure the mass concentration of particulate matters with different types and diameters according to set measurement parameters and set voltage thresholds.
Preferably, the voltage threshold setting unit takes the maximum value of the voltage values corresponding to the number of samples covering the setting range as the voltage threshold.
Preferably, the mass concentration measured by the standard instrument is m, the signal value measured by the photoelectric sensor is Sum, and the measurement parameter K of the photoelectric sensor is m/Sum.
Preferably, the photoelectric sensor is provided with a plurality of measuring channels, and the mass concentration of the particulate matters with different types and different diameters can be measured in different measuring channels simultaneously.
Preferably, the plurality of particles of a set diameter are generated by a standard particle generator.
Preferably, the plurality of particles of a set diameter are produced by burning a cigarette.
A method for setting measurement parameters of a device capable of measuring mass concentrations of various particulate matters comprises the following steps:
generating a large number of particles with a set diameter, obtaining a gas to be measured containing the particles, and measuring the particles in the gas to be measured by a photoelectric sensor to obtain a corresponding measured value and a voltage threshold value corresponding to the set diameter;
calculating voltage thresholds corresponding to other diameters according to the set diameter of the generated particles and the corresponding voltage threshold;
setting voltage thresholds for measuring different particle diameters according to the calculated voltage threshold for the photoelectric sensor;
and measuring the mass concentration m of all the particulate matters with the diameter less than or equal to a set diameter in the gas to be measured by a standard instrument, measuring the gas to be measured by a photoelectric sensor according to the voltage threshold value corresponding to the particles with the set diameter to obtain the signal value Sum of all the particulate matters with the diameter less than or equal to the set diameter under the corresponding voltage threshold value, and then calculating the measurement parameter K of the photoelectric sensor to be m/Sum.
Compared with the prior art, the invention has the advantages that: the invention uses a photoelectric sensor to measure the gas containing a large amount of particles with set diameters, determines the voltage threshold value corresponding to the measured value and the set diameter, thereby determining the measurement parameters, and after verification: the measurement parameters are constant and do not need to be set for many times; the particle number and the mass concentration of particles with different types and diameters can be simultaneously output by the same photoelectric sensor, for example, the particle number and the mass concentration with the particle sizes of 0.3 mu m, 1 mu m, 2.5 mu m, 5 mu m, 10 mu m and the like can be simultaneously output, the cost is saved, and the photoelectric sensor is suitable for popularization and application.
Drawings
FIG. 1 is a flow chart of a method of the present invention for measuring mass concentrations of particulate matter.
FIG. 2 is a graph of voltage values measured for a number of particles of a set diameter produced by a standard particle generator.
FIG. 3 is a voltage value interval distribution diagram of the voltage value diagram of FIG. 2.
Figure 4 is a graph of the corresponding voltage values measured for the gases produced by the combustion of a cigarette for the particulate matter therein.
FIG. 5 is a voltage value interval distribution diagram of the voltage value diagram of FIG. 4.
FIG. 6 is a block diagram of an apparatus for measuring mass concentrations of particulate matter according to the present invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Referring to fig. 1, the method for measuring mass concentrations of various particulate matters according to the present invention includes the following steps:
step S101, a standard particle generator is used for generating a large number of particles with a certain set diameter, a detected gas containing the particles is obtained, a photoelectric sensor is used for measuring the generated particles in the detected gas, and a corresponding measured value and a voltage threshold value corresponding to the set diameter are obtained.
In the above step S101, the standard particle generator can manufacture particles with a set diameter according to the setting and the need, thereby facilitating the measurement of the particles; referring to fig. 2, fig. 2 shows measured values obtained by the photoelectric sensor continuously measuring for a period of time when the measured gas flows through the photoelectric sensor; for example, particles with a diameter of 0.3um (micrometer) or less are generated by a standard particle generator, and the measured value measured by the photoelectric sensor is recorded, as can be seen from fig. 2, the measured value is a corresponding voltage value (or current value) measured for each particle, theoretically, the measured voltage value is proportional to the square of the diameter size of the particle, in order to reduce the error, the maximum value of the voltage values corresponding to 90% of the samples is taken as the voltage threshold, the statistical result shown in fig. 3 is obtained by performing statistical calculation on the data in fig. 2, as can be seen from fig. 3, the voltage value measured for 91.2% of the particles is 300mV (millivolts) or less, and therefore, the voltage threshold V0.3 of the particle with a diameter of 0.3um or less measured by the photoelectric sensor is set to be 300mV or less.
According to the method, the number of samples covering different proportions, such as 85% of samples, 95% of samples and the like, can be taken as required.
In addition, if no particle generator or other equipment is available, the gas and particles generated by the burning of the cigarette can be directly used as the gas to be detected and the particles to be detected, because the diameter of the particles generated after the burning of the cigarette is basically less than or equal to 1um, and the particle and the gas generated after the burning of the cigarette can be measured by a photoelectric sensor, so that the accurate voltage threshold value V1.0 can be obtained.
Step S102, calculating voltage threshold values corresponding to other diameters according to the set diameter of the generated particles and the corresponding voltage threshold values.
Because the voltage threshold value V is KD2Where K is a coefficient and D is a set diameter, it can be seen that the voltage threshold value when measuring the mass concentration of the particulate matter is proportional to the square of the diameter of the particulate matter, and therefore, the voltage threshold values corresponding to other set diameters can be calculated by the set diameter and the voltage threshold value corresponding thereto in step S101, for example, it is known that the voltage threshold value V0.3 of the particle having a diameter less than or equal to 0.3um, and the voltage threshold value V0.5 of the particle having a diameter less than or equal to 0.5um is (V0.3 x 0.5 ═ V0.32)/0.32(ii) a Further, for example, the voltage threshold V1.0 ═ V0.3 ═ 1 for particles having a diameter of less than or equal to 1um2)/0.32B, carrying out the following steps of; by analogy, the voltage threshold corresponding to each set measuring diameter can be obtained.
For example, if the voltage threshold V0.3 mV of particles having a diameter of 0.3um or less is 300mV measured in the above-described embodiments shown in fig. 2 and 3, the voltage threshold V1.0 mV (300 × 1 mV) of particles having a diameter of 1.0um or less can be calculated2)/0.323333 mV. Referring to fig. 4 and 5, which are statistical distributions of measured voltage values for particles having a major particle diameter of 1.0um or less in the gas generated by burning the cigarette, it can be seen from fig. 4 that the voltage value for 92.1% of the particles is 3333 ma or less, and that the voltage threshold value for the calculated particles having a particle diameter of 1.0um or less is substantially the same as the actually measured voltage threshold value.
And step S103, setting and measuring voltage thresholds corresponding to different particle diameters according to the calculated voltage threshold by the photoelectric sensor.
The photoelectric sensor is a module which needs to be calibrated before delivery or use.
And step S104, measuring the mass concentration m of all the particulate matters with the diameter less than or equal to a certain set diameter in the gas to be measured by a standard instrument, measuring the gas to be measured by a photoelectric sensor according to the voltage threshold value corresponding to the particles with the set diameter to obtain the signal value Sum of all the particulate matters with the diameter less than or equal to the set diameter under the corresponding voltage threshold value, and then calculating the measurement parameter K of the photoelectric sensor to be m/Sum. The above signal measurement Sum is the Sum of the measurements of all particles at the set voltage threshold.
For example, the mass concentration m1.0 of all particles having a diameter of 1.0um or less is measured by a standard instrument, and then the signal value sum1.0 at the voltage threshold corresponding to the mass concentration of all particles having a diameter of 1.0um or less is calculated from the measurement data obtained by measuring the gas to be measured by the photoelectric sensor, and then the measurement parameter K of the photoelectric sensor can be calculated as m 1.0/sum1.0.
And S105, setting the photoelectric sensor by using the measurement parameter K, and measuring the mass concentration of the particles with different types and diameters by using the photoelectric sensor by combining the previously calculated voltage thresholds corresponding to the diameters of the particles with different diameters.
Referring to the table below, in one embodiment, the mass concentration m of the gas burned by the cigarette is measured by a standard instrument and the signal value Sum measured by a photoelectric sensor under a set voltage threshold value to obtain 7 groups of data, and it can be seen from the table below that the K values of the measurement parameters calculated by the 7 groups of data are substantially consistent, so that the K values obtained by the method of the present invention can be used for measuring the gas containing particles with different diameters to obtain accurate measurement results.
Referring to the table below, in another embodiment, three different air samples are respectively measured, wherein the particle diameters of the particles are less than or equal to 1 μm (PM1.0), 2.5 μm (PM2.5) and 10 μm (PM10), wherein a standard instrument measures mass concentration, a photoelectric sensor measures signal values Sum to obtain 9 groups of data, 9 measurement parameter K values are calculated through the 9 groups of data, and the measurement parameter K values obtained through the calculation of the table below are substantially consistent, so that accurate measurement results can be obtained by measuring the mass concentrations of the particles with different types and diameters by using the measurement parameter K values obtained through the method of the present invention.
Please refer to fig. 6, which is a composition diagram of a system for measuring mass concentrations of various particulate matters according to the present invention, the system includes a photoelectric sensor 91 and a parameter calibration module 95, the photoelectric sensor 91 is a laser dust sensor, the parameter calibration module 95 is used to calibrate a measurement parameter of the photoelectric sensor 91 before the photoelectric sensor 91 leaves a factory or before the photoelectric sensor 91 is used, the parameter calibration module 95 includes a voltage threshold setting unit 951 and a measurement parameter calculation unit 952.
The voltage threshold setting unit 951 obtains a voltage threshold corresponding to a set diameter from a measured value of a gas to be measured including a large number of particles having the set diameter generated by a standard particle generator, which is measured by the photoelectric sensor 91, calculates a voltage threshold corresponding to another diameter from the set diameter of the generated particles and the corresponding voltage threshold, and sets voltage thresholds for measuring different particle diameters to the photoelectric sensor 91 according to the calculated voltage thresholds.
The measurement parameter calculation unit 952 calculates a measurement parameter K of the photoelectric sensor 91 to be m/Sum according to the mass concentration m of all the particles having a diameter smaller than or equal to a certain set diameter in the measured gas measured by a standard instrument and the signal value Sum of all the particles having a diameter smaller than or equal to the set diameter in the measured gas measured by the photoelectric sensor 91 under the corresponding voltage threshold, and sets the photoelectric sensor 91 according to the measurement parameter.
The photoelectric sensor 91 measures the mass concentration of the particulate matters with different types and different diameters according to a set measurement parameter K and a set voltage threshold; further, the photoelectric sensor 91 is provided with a plurality of measurement channels, so that the mass concentration of the particulate matters with different types and different diameters can be measured simultaneously.
In the above-mentioned measuring method and system, the measurement parameter K and the voltage threshold of the photoelectric sensor 91 are set, so that the photoelectric sensor 91 can accurately measure the mass concentration of different types or different particle size ranges of the particulate matters without adjusting the parameters of the photoelectric sensor 91.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (11)
1. A method of measuring mass concentrations of a plurality of particulate matter, comprising: the method comprises the following steps:
step 1: obtaining a large number of particles with a set diameter, obtaining a gas to be measured containing the particles, and measuring the particles in the gas to be measured by a photoelectric sensor to obtain a corresponding measured value and a voltage threshold value corresponding to the set diameter;
step 2: calculating voltage thresholds corresponding to other diameters according to the set diameter of the particles and the corresponding voltage threshold;
and step 3: setting voltage thresholds for measuring different particle diameters according to the calculated voltage threshold for the photoelectric sensor;
and 4, step 4: measuring the mass concentration of all particulate matters with the diameter less than or equal to a set diameter in the gas to be measured by a standard instrument, measuring the gas to be measured by a photoelectric sensor according to a voltage threshold value corresponding to the particles with the diameter less than or equal to the set diameter to obtain signal values of all the particulate matters with the diameter less than or equal to the set diameter under the corresponding voltage threshold value, and then calculating the measurement parameter of the photoelectric sensor according to the mass concentration and the signal values, wherein the mass concentration measured by the standard instrument is m, the signal value measured by the photoelectric sensor is Sum, and the measurement parameter K of the photoelectric sensor is m/Sum;
and 5: and setting the photoelectric sensor by using the measurement parameters, and measuring the mass concentration of the particles with different types and diameters by using the photoelectric sensor in combination with the previously calculated voltage threshold values corresponding to the diameters of the particles with different diameters.
2. The method of claim 1, wherein: in step 1, the maximum value of the voltage values corresponding to the number of samples covering the set range is taken as the voltage threshold.
3. The method of claim 1, wherein: in step 5, different measurement channels are arranged for the photoelectric sensor, and the mass concentration of the particulate matters with different types and different diameters is measured in the different measurement channels simultaneously.
4. The method of claim 1, wherein: in step 1, the plurality of particles of a set diameter are generated by a standard particle generator.
5. The method of claim 1, wherein: in step 1, the mass of particles of set diameter is produced by burning a cigarette.
6. A system for measuring mass concentrations of particulate matter using the method of any one of claims 1 to 4, wherein: the system comprises a photoelectric sensor and a parameter correction module, wherein the parameter correction module is used for correcting the measurement parameters of the photoelectric sensor before the photoelectric sensor leaves a factory or is used, and comprises a voltage threshold setting unit and a measurement parameter calculation unit;
the voltage threshold setting unit obtains a voltage threshold corresponding to a set diameter according to a measured value of a measured gas including a large number of particles with the set diameter measured by the photoelectric sensor, calculates voltage thresholds corresponding to other diameters according to the set diameter of the particles and the corresponding voltage thresholds, and sets voltage thresholds for measuring different particle diameters for the photoelectric sensor according to the calculated voltage thresholds;
the measurement parameter calculation unit calculates measurement parameters of the photoelectric sensor according to the mass concentration of all particulate matters with the diameter less than or equal to a set diameter in the gas to be measured by a standard instrument and signal values of all particulate matters with the diameter less than or equal to the set diameter in the gas to be measured by the photoelectric sensor under corresponding voltage threshold values, and sets the photoelectric sensor according to the measurement parameters, wherein the mass concentration measured by the standard instrument is m, the signal value measured by the photoelectric sensor is Sum, and the measurement parameter K of the photoelectric sensor is m/Sum;
the photoelectric sensor can measure the mass concentration of particulate matters with different types and diameters according to set measurement parameters and set voltage thresholds.
7. The system of claim 6, wherein: the voltage threshold setting unit takes the maximum value of the voltage values corresponding to the number of samples covering the set range as the voltage threshold.
8. The system of claim 6, wherein: the photoelectric sensor is provided with a plurality of measuring channels, and the mass concentration of particulate matters with different types and different diameters can be measured in different measuring channels simultaneously.
9. The system of claim 6, wherein: the plurality of particles of a set diameter are generated by a standard particle generator.
10. The system of claim 6, wherein: the plurality of particles of a set diameter are produced by burning a cigarette.
11. A method for setting measurement parameters of a device capable of measuring mass concentrations of various particulate matters is characterized in that: the method comprises the following steps:
generating a large number of particles with a set diameter, obtaining a gas to be measured containing the particles, and measuring the particles in the gas to be measured by a photoelectric sensor to obtain a corresponding measured value and a voltage threshold value corresponding to the set diameter;
calculating voltage thresholds corresponding to other diameters according to the set diameter of the generated particles and the corresponding voltage threshold;
setting voltage thresholds for measuring different particle diameters according to the calculated voltage threshold for the photoelectric sensor;
and measuring the mass concentration m of all the particulate matters with the diameter less than or equal to a set diameter in the gas to be measured by a standard instrument, measuring the gas to be measured by a photoelectric sensor according to the voltage threshold value corresponding to the particles with the set diameter to obtain the signal value Sum of all the particulate matters with the diameter less than or equal to the set diameter under the corresponding voltage threshold value, and then calculating the measurement parameter K of the photoelectric sensor to be m/Sum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710571323.XA CN109253953B (en) | 2017-07-13 | 2017-07-13 | Method and system capable of measuring mass concentration of various particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710571323.XA CN109253953B (en) | 2017-07-13 | 2017-07-13 | Method and system capable of measuring mass concentration of various particles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109253953A CN109253953A (en) | 2019-01-22 |
| CN109253953B true CN109253953B (en) | 2020-08-11 |
Family
ID=65050639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710571323.XA Active CN109253953B (en) | 2017-07-13 | 2017-07-13 | Method and system capable of measuring mass concentration of various particles |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109253953B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109883896B (en) * | 2019-03-06 | 2021-01-08 | 中国石油大学(北京) | Aerosol detection method and system |
| CN110987769B (en) * | 2019-12-26 | 2022-02-18 | 江苏苏净集团有限公司 | Calibration method of liquid particle counter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10116512A (en) * | 1996-10-13 | 1998-05-06 | Sanrei:Kk | Stone candlestick for grave |
| CN103018145A (en) * | 2012-10-12 | 2013-04-03 | 桂林电子科技大学 | Novel real-time PM2.5 (particulate matter 2.5) mass concentration monitoring device and monitoring method |
| CN105352860A (en) * | 2015-10-23 | 2016-02-24 | 上海智觅智能科技有限公司 | Data processing method of infrared dust sensor |
| CN105698144A (en) * | 2014-11-26 | 2016-06-22 | 阜南县方柳工艺品有限公司 | Detachable windproof candle holder |
| CN106644865A (en) * | 2016-12-22 | 2017-05-10 | 西安工业大学 | Dust concentration calibration system and calibration method |
-
2017
- 2017-07-13 CN CN201710571323.XA patent/CN109253953B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10116512A (en) * | 1996-10-13 | 1998-05-06 | Sanrei:Kk | Stone candlestick for grave |
| CN103018145A (en) * | 2012-10-12 | 2013-04-03 | 桂林电子科技大学 | Novel real-time PM2.5 (particulate matter 2.5) mass concentration monitoring device and monitoring method |
| CN105698144A (en) * | 2014-11-26 | 2016-06-22 | 阜南县方柳工艺品有限公司 | Detachable windproof candle holder |
| CN105352860A (en) * | 2015-10-23 | 2016-02-24 | 上海智觅智能科技有限公司 | Data processing method of infrared dust sensor |
| CN106644865A (en) * | 2016-12-22 | 2017-05-10 | 西安工业大学 | Dust concentration calibration system and calibration method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109253953A (en) | 2019-01-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105334147B (en) | Particulate matter on-line monitoring system and method based on β ray methods and light scattering method | |
| CN104122180B (en) | A kind of method measuring particulate matter mass concentration | |
| CN203949849U (en) | A kind of pick-up unit of measuring particle quality concentration | |
| CN103018145A (en) | Novel real-time PM2.5 (particulate matter 2.5) mass concentration monitoring device and monitoring method | |
| Aggarwal et al. | Traceability issue in PM 2.5 and PM 10 measurements | |
| CN102590447A (en) | Method and equipment for calibrating dust-measuring instrument | |
| CN109253953B (en) | Method and system capable of measuring mass concentration of various particles | |
| Javed et al. | Performance evaluation of real-time DustTrak monitors for outdoor particulate mass measurements in a desert environment | |
| Wu et al. | Evaluation of aerosol-spectrometer based PM2. 5 and PM10 mass concentration measurement using ambient-like model aerosols in the laboratory | |
| US11555771B2 (en) | Method and device for simultaneously measuring mass concentrations of particulates with different sizes | |
| CN113874707A (en) | Method for determining the particle size distribution of an aerosol and aerosol measuring device | |
| CN202869934U (en) | Novel real-time monitoring device for mass concentration of PM2.5 | |
| CN114199734A (en) | Method and system for measuring mass concentration of online polluting particulate matters | |
| Horender et al. | Facility for production of ambient-like model aerosols (PALMA) in the laboratory: application in the intercomparison of automated PM monitors with the reference gravimetric method | |
| CN113670783A (en) | Method and device for directly measuring and calculating concentration of particulate matters in gas based on beta-ray method | |
| Ames et al. | Optical measurements of aerosol size distributions in Great Smoky Mountains National Park: dry aerosol characterization | |
| CN110736691A (en) | Concentration correction method of particle sensor by laser scattering method | |
| Van Ransbeeck et al. | Indoor concentration measurements of particulate matter at a pig fattening facility: Comparison and equivalence tests with different sampling instruments and measuring techniques | |
| CN106442248B (en) | Granular material discharged concentration measuring method and system in a kind of gas | |
| KR20220162723A (en) | Method and aerosol measuring device for determining the source dependent particle size distribution of an aerosol | |
| CN205483925U (en) | Particulate matter on -line monitoring system | |
| CN205449745U (en) | Cigarette dust content direct reading monitoring system | |
| CN113405961B (en) | Dust concentration detection method based on multi-angle light scattering | |
| CN220019301U (en) | Standard substance transfer device of automatic monitoring equipment for particulate matters in ambient air | |
| Wang | Optical particle counter (OPC) measurements and pulse height analysis (PHA) data inversion |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 430205, No. three, No. 3, Fenghuang garden, Phoenix Industrial Park, East Lake New Technology Development Zone, Hubei, Wuhan Applicant after: Sifang Optoelectronic Co.,Ltd. Address before: 430000, No. three, No. 3, Fenghuang garden, Phoenix Industrial Park, East Lake New Technology Development Zone, Hubei, Wuhan Applicant before: Wuhan Cubic Optoelectronics Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |