CN107063954B - A kind of method that error correction control system, β dust gauge eliminate strainer error - Google Patents
A kind of method that error correction control system, β dust gauge eliminate strainer error Download PDFInfo
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- CN107063954B CN107063954B CN201710235234.8A CN201710235234A CN107063954B CN 107063954 B CN107063954 B CN 107063954B CN 201710235234 A CN201710235234 A CN 201710235234A CN 107063954 B CN107063954 B CN 107063954B
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- 238000012937 correction Methods 0.000 title claims abstract description 95
- 239000000428 dust Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005070 sampling Methods 0.000 claims abstract description 48
- 239000002245 particle Substances 0.000 claims abstract description 24
- 238000012790 confirmation Methods 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims description 38
- 239000012528 membrane Substances 0.000 claims description 20
- 230000002285 radioactive effect Effects 0.000 claims description 20
- 239000013618 particulate matter Substances 0.000 claims description 4
- 230000026676 system process Effects 0.000 claims description 3
- 229920006267 polyester film Polymers 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 19
- 230000005855 radiation Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000005250 beta ray Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
- G01N15/0618—Investigating concentration of particle suspensions by collecting particles on a support of the filter type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N2015/0042—Investigating dispersion of solids
- G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N2015/0662—Comparing before/after passage through filter
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- Sampling And Sample Adjustment (AREA)
Abstract
The present invention relates to a kind of error correction control system and the methods for eliminating strainer quality error.The system includes scaling module (11), blank benchmark confirmation module (12), correction value module (13), the calculation of unit area collection dust counter module (14), particle concentration output module (15): processing of the scaling module (11) to blank strainer count value and standard diaphragm count value stores calibration data；Blank benchmark confirmation module (12) determines blank counts a reference value and datum mark；Correction value module (13) by before sampling blank strainer quantity count value and the of poor quality of datum mark be set as corrected value；Unit area collection dust counter is calculated module (14) and is corrected to the mass incremental after sampling；Particle concentration output module (15) calculates the inspirable particle concentration after correction.System and method of the invention when not increasing any external condition, solve the problems, such as because strainer quality unevenly caused by the absorption dust gauge output error of β.
Description
Technical Field
The invention relates to the field of error correction of β absorption type dust meters, in particular to an error correction control system, a dust meter and a method for eliminating filter belt quality errors.
Background
The β radiation from the radioactive source is converted into an electronic pulse (frequency) using a radiation sensor and associated electronics, since low energy (<1MeV) β radiation is attenuated by absorption of energy through the material as it passes through the material, and studies have shown that the degree of attenuation is related to the mass of the material passing through, and therefore the change in pulse frequency is also related to the mass of the material passing through, "β absorption dust meter" uses this principle to make measurements.
In order to eliminate errors caused by the fluctuation phenomenon of the radioactive source, the β absorption type dust meter needs to count and count the pulse frequency (generally 2 minutes) when in work.
β the ray attenuation relationship is described by:
wherein: i is0β intensity of radiation from source
β intensity after radiation has passed through a substance
K instrument correction factor (cm)2/mg)
Δ mt total mass per unit area of material passed through (mg/cm)2)
Under certain conditions, the counting frequency N is proportional to the radiation intensity I, i.e.:
the sampling method of the β absorption dust meter is filter type, the unit area mass of an unstamped blank filter band is set as delta mt, the unit area mass increment after sampling is delta m, the statistical counting time is Ts, the counting value on the blank filter band is N1, the counting value after sampling is N2, then:
it can be solved that:
Δm＝1/k ln(N1/N2) ⑤
the output formula of "β absorption dust meter":
C＝Δm/V＝Δm/TAC*Q ⑥
wherein:Δ m dust collecting amount per unit area (mg/cm)2)
V volume of sampled gas (m)3)
TACSampling time (h)
Q gas flow (m)3/h)
The work flow of the β absorption type dust meter is as follows:
moving the filter belt to a working site (between a radioactive source and a detector) → blank filter belt counting (N1) → original position sampling → counting the mass of the sample (N2) → increment of the mass per unit area obtained after calculation according to the formula ⑤ → output results, as shown in fig. 1, the working cycle is one working cycle, working can be carried out circularly according to the situation, and the inhalable particle concentration is obtained according to the dust collection amount per unit area.
Before use, the instrument needs to be calibrated (calibrated) with a "standard diaphragm" of known mass (Δ m), i.e. according to the β ray attenuation relation ③④, to find the K value of the instrument, in general, the calibration procedure of "β absorption dust meter" is:
after the fixed filter belt is between the radioactive source and the detector (working point), firstly, N1 counting is carried out on a blank filter belt and manual recording is carried out, after the counting is finished, the pressure head is lifted, a standard mass diaphragm is inserted (superposed) on the blank filter belt of the working point, namely, a standard diaphragm with known mass (delta m) is inserted at the same position to carry out N2 counting, and the value is manually recorded. The end of N2 is the end of a scaling period. Such a cycle is repeated not less than 10 times. And performing statistical calculation on N1 and N2, calculating a K value according to the formula, and storing the K value. The K value is used as the intrinsic parameter of the instrument to participate in the output of the monitoring result. The calibration process is as in figure 2.
The calibration process shows that if blank masses of all points on the filter belt are uniform and equal, the K value is unchanged, and if the blank masses of all points on the filter belt are not uniform, the K values of scales at different points are different, and if the blank masses of all points on the filter belt are not equal, the K values of scales at different points are different, the conventional β absorption type dust meter (PM2.5/PM10) adopts a filtering mode for sampling.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a method for eliminating filter belt errors for an error correction control system, β absorption type dust meter, so as to achieve the purpose of eliminating the quality errors of the existing dust meter without adding any external equipment or other conditions.
The invention firstly provides an error correction control system which is characterized by comprising a calibration module, a blank reference confirmation module, a correction value calculation module, a unit area dust collection amount calculation module and a particulate matter concentration output module; wherein,
the calibration module is used for processing the measured blank filter band count value and the standard diaphragm count value to obtain calibration data and storing the calibration data;
the blank reference confirmation module calls the calibration data and determines a blank counting reference value and a reference point;
the correction value calculation module is used for setting the quality difference between the blank filter band before sampling and the reference point from the blank reference confirmation module as a correction value and calling the calibration data to obtain the correction value;
the unit area dust collection amount calculation module receives a sampled sample filter belt counting value and calls the calibration data to calculate a mass increment, and then performs error correction on the mass increment by using the correction value from the correction value calculation module to obtain a unit area dust collection amount;
and the particle concentration output module is used for solving the corrected inhalable particle concentration according to the unit area dust collection amount.
Specifically, the calibration data includes the mean value of the blank filter band count values and an instrument correction factor.
Further, the calibration data further includes an average value of the standard diaphragm count values and a mass per unit area of the standard diaphragm.
Specifically, the average value of the blank filter band count values is the blank count reference value, and the blank quality corresponding to the blank count reference value is the reference point.
The invention also provides a dust meter comprising the error correction control system, which is characterized by further comprising a pump controller, a sampling and measuring device and a display; wherein,
the pump controller is used for receiving a switching command and sending a signal for starting or stopping measurement to the sampling measurement device;
the sampling measuring device receives a measuring starting signal, is used for measuring a blank filter band, an increment of the blank filter band and a standard diaphragm to obtain a blank filter band count value, a sampled filter band count value and a standard diaphragm count value, and transmits measured data to the error correction control system; receiving a measurement stopping signal and stopping measurement;
the error correction control system processes the data from the sampling measurement device to obtain the corrected inhalable particle concentration;
the display is operable to receive and display the value of the inhalable particulate concentration.
Furthermore, the sampling and measuring device comprises an air path pipeline, β radioactive sources, a detector, an output pipeline, an air pump and a filter belt, wherein,
the gas path pipeline is provided with a sampling inlet and a sampling outlet, the sampling outlet is connected with the output pipeline, and the air pump is arranged at the outlet of the output pipeline;
the β radioactive source is further arranged inside the gas path pipeline, the filter belt is arranged below the β radioactive source, the detector is arranged below the filter belt, the detector and the β radioactive source are oppositely arranged and are respectively spaced from the filter belt at a certain distance, and a blank filter belt or a standard membrane can be placed at the position of the filter belt;
the air pump is connected with the error correction control system through the pump controller, and the error correction control system is connected with the detector and the display.
The invention also provides a method for eliminating the quality error of the filter belt by using the error correction control system, which is characterized by comprising the following steps:
a, calibration: processing the measured blank filter band count value and the standard diaphragm count value, and storing the obtained calibration data;
b, blank reference confirmation: calling the calibration data, and determining a blank counting reference value and a reference point;
c, calculating a correction value: setting the quality difference between the blank filter band before sampling and the reference point from the blank reference confirmation module as a correction value, and calling the calibration data to obtain the correction value;
d, calculating the dust collection amount of the unit area: receiving a sampled sample filter belt count value and calling the calibration data to calculate a mass increment, and then performing error correction on the mass increment by using the correction value from the correction value calculation module to obtain a unit area dust collection amount;
e, outputting the concentration of the particulate matters: and calculating the corrected inhalable particle concentration according to the unit area dust collection amount.
Preferably, the period of scaling in step a is not less than 10 times.
Further, the counting time calibrated in the step A is 2-5 min.
Specifically, the standard membrane is a polyester membrane.
The invention also provides a dust measuring method using the dust measuring instrument, wherein the dust measuring instrument is an β absorption type dust measuring instrument, and the dust measuring method is characterized by comprising the following steps:
a sends out a start or stop measurement signal: the pump controller receives a switching command and sends a signal for starting or stopping measurement to the sampling measurement device;
b, calibration measurement: after the sampling measuring device receives the signal for starting measurement, measuring a blank filter band count value and a standard diaphragm count value; stopping measurement after receiving the measurement stopping signal;
c, scaling: processing the measured blank filter band count value and the standard diaphragm count value, and storing the obtained calibration data;
and D, confirming blank reference: calling the calibration data, and determining a blank counting reference value and a reference point;
e, calculating a correction value: setting the quality difference between any point of the blank filter band before sampling and the reference point from a blank reference confirmation module as a correction value, and calling the calibration data to obtain the correction value;
f, calculating the dust collection amount of the unit area: receiving a sampled sample filter belt count value and calling the calibration data to calculate a mass increment, and then performing error correction on the mass increment by using the correction value from the correction value calculation module to obtain a unit area dust collection amount;
g, outputting the concentration of particulate matters: and calculating the corrected inhalable particle concentration according to the unit area dust collection amount and transmitting the corrected inhalable particle concentration to a display for display.
The technical scheme of the invention establishes the concept of mass reference points in the uneven filter belt, adopts a filter belt error base point correction mode, fully utilizes the β absorption principle and the radioactive fluctuation statistical data without adding any external condition (applicable to all current β absorption type dust meters) and changing any hardware, and solves the problem of output error of the β absorption type dust meter caused by uneven filter belt mass in theory and practice.
Drawings
Fig. 1 is a work flow chart of "β absorption type dust meter".
FIG. 2 is a calibration flow chart of "β absorption type dust meter".
FIG. 3 is a diagram of an error correction control system of the present invention;
1-an error correction control system; 11-a calibration module, 12-a blank reference confirmation module, 13-a correction value calculation module, 14-a unit area dust collection amount calculation module and 15-a particulate matter concentration output module.
Fig. 4 is a schematic view of the dust meter of the present invention.
1-an error correction control system, 2-a pump controller, 3-a sampling measuring device and 4-a display;
31-gas path pipeline, 32- β radioactive source, 33-detector, 34-output pipeline, 35-air pump and 36-filter belt.
FIG. 5 is a calibration flow chart of the present invention.
Fig. 6 is a flow chart of the working process of the dust measuring instrument of the invention.
Detailed Description
The invention will be described in more detail below with reference to the drawings and examples, so that aspects of the invention and advantages thereof can be better understood. However, the following description of the specific embodiments is for illustrative purposes only and is not intended to limit the present invention.
In order to achieve the purpose of eliminating the mass error of the existing dust measuring instrument without adding any external equipment or other conditions, the invention provides an error correction control system 1, as shown in fig. 3, which comprises a calibration module 11, a blank reference confirmation module 12, a correction value calculation module 13, a unit area dust collection amount calculation module 14 and a particulate matter concentration output module 15; wherein,
the calibration module 11 is used for processing the measured blank filter band count value and the standard membrane count value to obtain calibration data and storing the calibration data;
the blank reference confirmation module 12 calls the calibration data and determines a blank counting reference value and a reference point;
the correction value calculation module 13 sets the quality difference between the blank filter band quality count value before sampling and the reference point from the blank reference confirmation module as a correction value, and calls the calibration data to obtain the correction value;
the unit area dust collection amount calculation module 14 receives the sampled sample filter belt count value and calls the calibration data to calculate a mass increment, and then performs error correction on the mass increment by using the correction value from the correction value calculation module to obtain a unit area dust collection amount;
the particle concentration output module 15 obtains the corrected inhalable particle concentration according to the unit area dust collection amount.
Specifically, the calibration data includes the mean value of the blank filter band count values and an instrument correction factor.
Furthermore, the calibration data also comprises the average value of the count value of the standard diaphragm and the mass of the standard diaphragm in unit area, and the storage of the data is favorable for deriving a dynamic correction K value without working modes or technologies such as automatic calibration of the standard diaphragm.
Specifically, the average value of the blank filter band count values is the blank count reference value, and the blank quality corresponding to the blank count reference value is the reference point.
The invention also provides a dust measuring instrument comprising the error correction control system, as shown in fig. 4, the dust measuring instrument further comprises a pump controller 2, a sampling measuring device 3 and a display 4; wherein,
the pump controller 2 is used for receiving a switching command and sending a signal for starting or stopping measurement to the sampling and measuring device;
the sampling measuring device 3 receives a measuring starting signal, is used for measuring a blank filter band, an increment of the blank filter band and a standard diaphragm to obtain a blank filter band count value, a sampled filter band count value and a standard diaphragm count value, and transmits measured data to the error correction control system; receiving a measurement stopping signal and stopping measurement;
the error correction control system processes the data from the sampling measurement device to obtain the corrected inhalable particle concentration;
the display 4 can be used to receive and display the value of the inhalable particle concentration.
Furthermore, the sampling and measuring device 3 comprises an air pipeline 31, β radioactive source 32, a detector 33, an output pipeline 34, a suction pump 35 and a filter belt 36, wherein,
the gas pipeline 31 is provided with a sampling inlet and a sampling outlet, the sampling outlet is connected with the output pipeline 34, and the air pump 35 is arranged at the outlet of the output pipeline 34;
the β radioactive source 32 is further arranged inside the air channel pipeline 31, the filter belt 36 is arranged below the β radioactive source 32, the detector 33 is arranged below the filter belt 36, the detector 33 is arranged opposite to the β radioactive source 32 and is respectively spaced from the filter belt 36 by a certain distance, and a blank filter belt or a standard membrane can be placed at the filter belt position 36;
the air pump 35 is connected with the error correction control system 1 through the pump controller 2, and the error correction control system 1 is connected with the detector 33 and the display 4.
The invention also provides a method for eliminating the quality error of the filter belt by using the error correction control system, which comprises the following steps:
a, calibration: referring to fig. 5, after the measured blank filter band count value N1 and standard membrane count value N2 are processed, the average value Nj1 of the blank filter band count values and the average value Nj2 of the standard membrane count values are obtained, and the instrument correction coefficient K value and the mass per unit area (mg/cm) of the standard membrane are obtained2) Keeping the data in a ROM of the instrument; preferably, the number of the cycles for calibration in the step A is not less than 10;
b, blank reference confirmation: setting the average value Nj1 of the blank filter bands as a blank counting reference value of the whole filter band, and setting the blank mass m corresponding to the blank counting reference value as the reference point;
c, calculating a correction value, namely setting the difference value delta md of the blank filter belt quality mi before sampling and the quality m of the reference point as a correction value, wherein the value can be positive, negative or 0, so that the filter belt quality at any point is ⑦ mi to be m +/-delta md, and when the instrument counts N1 at any point of the filter belt, the difference value can be calculated by an expression ⑧, namely ⑧ delta md to be 1/k ln (Nj 1/N1);
d, calculating the unit area dust collection amount, namely receiving a sampled sample filter belt count value N2, calling the calibration data (namely an instrument correction coefficient) to calculate mass increment, then carrying out error correction by using the delta md obtained by the formula ⑧, and obtaining the unit area dust collection amount according to the formula ⑨, wherein ⑨ delta m is {1/k ln (Nj1/N2) } - { + -delta md };
e, outputting the particle concentration, namely substituting the delta m into an ⑥ formula according to the unit area dust collection amount, and calculating the corrected inhalable particle concentration, wherein the error of uneven thickness of the filter belt is deducted.
According to the thought, a dynamic correction K value can be derived without working modes or technologies such as automatic calibration of a standard diaphragm. No technical solution similar or analogous to the present invention has been found.
The calibration process is completed by manual calibration.
Preferably, the counting time scaled in said step A is 2-5 min.
Specifically, the standard membrane is a polyester membrane.
The invention also provides a dust measuring method using the dust measuring instrument, wherein the dust measuring instrument can be an β dust measuring instrument, and the dust measuring method is characterized by comprising the following steps:
a sends out a start or stop measurement signal: the pump controller receives a switching command and sends a signal for starting or stopping measurement to the sampling measurement device;
b, calibration measurement: after the sampling measuring device receives the signal for starting measurement, measuring a blank filter band count value and a standard diaphragm count value; stopping measurement after receiving the measurement stopping signal;
c, scaling: processing the measured blank filter band count value and the standard diaphragm count value, and storing the obtained calibration data;
and D, confirming blank reference: calling the calibration data, and determining a blank counting reference value and a reference point;
e, calculating a correction value: moving the filter band to a working site (between a radioactive source and a detector), setting the mass difference between any point of the blank filter band before sampling and the reference point from a blank reference confirmation module as a correction value delta md, and calling the calibration data (namely an instrument correction coefficient k) to obtain the correction value;
f, calculating the dust collection amount of the unit area: receiving a sampled sample filter belt count value N2, calling the calibration data (namely an instrument correction coefficient k) to calculate a mass increment, and then carrying out error correction on the mass increment by using the correction value delta md from the correction value calculation module to obtain a unit area dust collection amount delta m;
g, outputting the concentration of particulate matters: and calculating the corrected inhalable particle concentration according to the unit area dust collection amount.
The measurement process is a work period and can be cycled according to the situation, see fig. 6, and the concentration of inhalable particles is obtained according to the dust collection amount per unit area and is transmitted to a display for display.
The method for determining the base point of the mass of the filter belt provided by the invention fully utilizes the β absorption principle and the radioactive fluctuation statistical data, and solves the difficult problem of output error of the β absorption dust meter caused by uneven mass of the filter belt from theory and practice.
Claims (7)
1. An error correction control system for an β dust measuring instrument is characterized by comprising a calibration module, a blank reference confirmation module, a correction value calculation module, a unit area dust collection amount calculation module and a particulate matter concentration output module,
the calibration module is used for processing the measured blank filter belt count value and the measured standard membrane count value to obtain a blank filter belt count value average value Nj1 and a standard membrane count value average value Nj2, and obtaining and storing an instrument correction coefficient K value and the unit area mass of the standard membrane;
the blank reference confirmation module sets the blank filter band count value average value Nj1 as a blank count reference value of the whole filter band, and sets the blank quality corresponding to the blank count reference value as the reference point;
the correction value calculation module sets the difference value delta md between the blank filter belt quality mi before sampling and the quality m of the reference point as a correction value, so that the filter belt arbitrary point quality mi is m +/-delta md; when the instrument counts at any point of the filter band N1, the mass difference can be calculated by the formula of Δ md ═ 1/kln (Nj 1/N1);
the unit area dust collection amount calculation module receives a sampled sample filter belt count value N2, calls an instrument correction coefficient to calculate a mass increment, then performs error correction by using delta md, and obtains the unit area dust collection amount according to a formula of delta m ═ 1/k ln (Nj1/N2) } - { +/-delta md;
and the particle concentration output module is used for solving the corrected inhalable particle concentration according to the unit area dust collection amount.
2. A dust meter comprising the error correction control system of claim 1, wherein the dust meter further comprises a pump controller, a sampling measurement device, a display; wherein,
the pump controller is used for receiving a switching command and sending a signal for starting or stopping measurement to the sampling measurement device;
the sampling measuring device receives a measuring starting signal, is used for measuring a blank filter band, an increment of the blank filter band and a standard diaphragm to obtain a blank filter band count value, a sampled filter band count value and a standard diaphragm count value, and transmits measured data to the error correction control system; receiving a measurement stopping signal and stopping measurement;
the error correction control system processes the data from the sampling measurement device to obtain the corrected inhalable particle concentration;
the display is operable to receive and display the value of the inhalable particulate concentration.
3. A dust meter according to claim 2,
the sampling and measuring device comprises an air path pipeline, an β radioactive source, a detector, an output pipeline, an air pump and a filter belt, wherein,
the gas path pipeline is provided with a sampling inlet and a sampling outlet, the sampling outlet is connected with the output pipeline, and the air pump is arranged at the outlet of the output pipeline;
the β radioactive source is further arranged inside the gas path pipeline, the filter belt is arranged below the β radioactive source, the detector is arranged below the filter belt, the detector and the β radioactive source are oppositely arranged and are respectively spaced from the filter belt at a certain distance, and a blank filter belt or a standard membrane can be placed at the position of the filter belt;
the air pump is connected with the error correction control system through the pump controller, and the error correction control system is connected with the detector and the display.
4. A method for eliminating band quality errors using the error correction control system of claim 1, comprising the steps of:
a, calibration: processing the measured blank filter belt count value and the measured standard membrane count value to obtain an average value Nj1 of the blank filter belt count value and an average value Nj2 of the standard membrane count value, and obtaining and storing an instrument correction coefficient K value and the unit area mass of the standard membrane;
b, blank reference confirmation: setting the average value Nj1 of the blank filter band count value as a blank count reference value of the whole filter band, and setting the blank quality corresponding to the blank count reference value as the reference point;
c, calculating a correction value: setting the difference value delta md of the blank filter belt quality mi before sampling and the quality m of the reference point as a correction value, so that the filter belt arbitrary point quality mi is m +/-delta md; when the instrument counts at any point of the filter band N1, the mass difference can be calculated by the formula of Δ md ═ 1/kln (Nj 1/N1);
d, calculating the dust collection amount of the unit area: receiving a sampled sample filter belt count value N2, calling an instrument correction coefficient to calculate a mass increment, then carrying out error correction by using delta md, and obtaining the unit area dust collection quantity according to a formula of delta m ═ {1/k ln (Nj1/N2) } - { +/-delta md };
e, outputting the concentration of the particulate matters: and calculating the corrected inhalable particle concentration according to the unit area dust collection amount.
5. The method according to claim 4, wherein the period of calibration in step A is not less than 10 times, and the counting time is 2-5 min.
6. The method of claim 5, wherein the standard film is a polyester film.
7. A dust measuring method using the dust meter according to claim 2 or 3, characterized in that the dust measuring method comprises the steps of:
a sends out a start or stop measurement signal: the pump controller receives a switching command and sends a signal for starting or stopping measurement to the sampling measurement device;
b, calibration measurement: after the sampling measuring device receives the signal for starting measurement, measuring a blank filter band count value and a standard diaphragm count value; stopping measurement after receiving the measurement stopping signal;
c, scaling: processing the measured blank filter belt count value and the measured standard membrane count value to obtain an average value Nj1 of the blank filter belt count value and an average value Nj2 of the standard membrane count value, and obtaining and storing an instrument correction coefficient K value and the unit area mass of the standard membrane;
and D, confirming blank reference: setting the average value Nj1 of the blank filter band count value as a blank count reference value of the whole filter band, and setting the blank quality corresponding to the blank count reference value as the reference point;
e, calculating a correction value: setting the difference value delta md of the blank filter belt quality mi before sampling and the quality m of the reference point as a correction value, so that the filter belt arbitrary point quality mi is m +/-delta md; when the instrument counts at any point of the filter band N1, the mass difference can be calculated by the formula of Δ md ═ 1/kln (Nj 1/N1);
f, calculating the dust collection amount of the unit area: receiving a sampled sample filter belt count value N2, calling an instrument correction coefficient to calculate a mass increment, then carrying out error correction by using delta md, and obtaining the unit area dust collection quantity according to a formula of delta m ═ {1/k ln (Nj1/N2) } - { +/-delta md };
g, outputting the concentration of particulate matters: and calculating the corrected inhalable particle concentration according to the unit area dust collection amount and transmitting the corrected inhalable particle concentration to a display for display.
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| CN111141769A (en) * | 2019-12-26 | 2020-05-12 | 北京雪迪龙科技股份有限公司 | Detection method of monitor utilizing β to absorb particulate matters and β monitor to absorb particulate matters |
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| CN107063954A (en) | 2017-08-18 |
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