CN109655386B - Particulate matter concentration detection device - Google Patents
Particulate matter concentration detection device Download PDFInfo
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- CN109655386B CN109655386B CN201811420656.3A CN201811420656A CN109655386B CN 109655386 B CN109655386 B CN 109655386B CN 201811420656 A CN201811420656 A CN 201811420656A CN 109655386 B CN109655386 B CN 109655386B
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- 238000001514 detection method Methods 0.000 title claims abstract description 16
- 239000013618 particulate matter Substances 0.000 title claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims abstract description 63
- 239000000428 dust Substances 0.000 claims abstract description 56
- 239000000523 sample Substances 0.000 claims abstract description 56
- 238000005259 measurement Methods 0.000 claims abstract description 27
- 239000002245 particle Substances 0.000 claims abstract description 24
- 238000012937 correction Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 7
- 230000002999 depolarising effect Effects 0.000 claims 1
- 230000028161 membrane depolarization Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000007430 reference method Methods 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
-
- 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
- G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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- 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)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses a particulate matter concentration detection device and a detection method, wherein the detection device comprises a measurement unit, a reference correction unit and a controller which is respectively connected with the measurement unit and the reference correction unit; the measuring unit comprises a light source for emitting laser to the particles to be measured and a second optical probe for receiving scattered light signals emitted by the dust particles to be measured, and the scattered light signals are converted into dust concentration signals and then sent to the controller; the reference correction unit comprises a first optical probe and a beam splitter, wherein the beam splitter is used for dividing a light source into two light paths; one beam of light split by the beam splitter emits to dust particles to be detected, and the other beam of light is received by the first optical probe and then converted into a reference electric signal to be sent to the controller; the controller is connected with the first optical probe and the second optical probe respectively and is used for receiving the reference electric signal and the dust concentration signal and obtaining the dust particle concentration signal through the reference electric signal and the dust concentration signal.
Description
Technical Field
The present utility model relates to a particulate matter concentration detection device.
Background
With the rapid development of national economy, smoke dust is discharged into the atmosphere in the production process in many fields of industrial production, such as coal-fired power plants, cement and the like, so that environmental pollution is increasingly prominent, and adverse effects are caused to the life and physical health of people. Therefore, the emission of the smoke concentration is limited, and the real-time monitoring of the dust provides data support for limiting the emission. At present, the industrial measurement mainly adopts a laser scattering method, and the measurement is carried out on an industrial site in an in-situ installation mode, so that the dust equipment is influenced to a certain extent due to the severe site environment, and the measurement precision is influenced. Low concentration measurements are particularly evident and thus improving accuracy becomes more important.
Such as published patent application number: 201510053394.1 in the patent publication No. CN104596904A, the utility model relates to a dust concentration measuring method of a laser dust sensor, which comprises the steps of calibrating the laser dust sensor at normal temperature and recording three indexes influencing the dust concentration during calibration: the voltage value of the photoelectric sensor after passing through the primary amplifier, the comparison voltage value after passing through a blocking capacitor and a secondary amplifier and the fan rotating speed; correcting factors such as attenuation of the optical path device, temperature and humidity change and the like; correcting the rotation speed of a fan in the laser dust sensor; thereby obtaining the real-time dust measurement concentration of the laser dust sensor. According to the utility model, by sequentially correcting and compensating each factor influencing the dust measurement concentration of the sensor, the measurement accuracy of the sensor is greatly improved.
The measuring method needs to compare and correct the influence factors such as attenuation, temperature and humidity of the photoelectric sensor and the optical path device, and the complexity of the system is increased. Meanwhile, a large number of tests are needed to obtain the compensation result, so that the burden is increased on the maintenance and related inspection of the instrument, and the operation of the on-line instrument is inconvenient.
Disclosure of Invention
The utility model aims to provide a particulate matter concentration detection device, which is used for solving the problem that a laser scattering dust meter is easy to generate measurement errors due to interference of external factors such as ambient temperature, humidity and pressure on a measurement signal in the working process.
In order to solve the technical problems, the utility model provides a particulate matter concentration detection device, which comprises a measurement unit, a reference correction unit and a controller connected with the measurement unit and the reference correction unit respectively.
The measuring unit comprises a light source for emitting laser to the particles to be measured and a second optical probe for receiving scattered light signals emitted by the dust particles to be measured, and the scattered light signals are converted into dust concentration signals and then sent to the controller.
The reference correction unit comprises a first optical probe and a beam splitter, wherein the beam splitter is used for dividing the light source into two light paths; one beam of light split by the beam splitter is emitted to dust particles to be detected, and the other beam of light is received by the first optical probe, converted into a reference electric signal and sent to the controller.
The controller is respectively connected with the first optical probe and the second optical probe and is used for receiving the reference electric signal and the dust concentration signal and obtaining a dust particle concentration signal through the reference electric signal and the dust concentration signal.
Further, the beam splitter is a depolarization beam splitter prism, the separated polarized light P is emitted to dust particles to be detected, and the polarized light S is reflected to the first optical probe through a reflecting mirror.
Further, the beam splitter and the reflecting mirror are arranged in a transparent mirror box and on the same side wall of the mirror box, and the first optical probe and the light source are arranged on the other side wall of the mirror box opposite to the beam splitter and the reflecting mirror.
Further, the first optical probe is arranged at one end of the first receiving cylinder, and the other end of the first receiving cylinder faces to the optical path of the other beam of light split by the beam splitter.
Further, the second optical probe is arranged at one end of the second receiving cylinder, and the other end of the second receiving cylinder faces to the optical path of the scattered light signal scattered by the dust particles to be detected.
Further, the other end of the second receiving cylinder is disposed obliquely to the side on which the light source is disposed.
Further, the light source, the first receiving cylinder and the second receiving cylinder are all fixed on a base.
Further, the controller comprises a microcontroller, an AD sampler, a power supply and an output unit, wherein the AD sampler, the power supply and the output unit are respectively connected with the microcontroller, and the first optical probe and the second optical probe are connected with the AD sampler through input end members.
In addition, the application also discloses a method for detecting the concentration of the particulate matters, which comprises the following steps:
s1: acquiring a reference electric signal and a dust concentration signal under standard conditions, and calculating an interference coefficient through the reference electric signal and the dust concentration signal;
s2: and compensating the dust concentration signal in the working process according to the interference coefficient and the real-time reference electric signal obtained in the actual working process to obtain the actual dust concentration.
Further, the calculation formula of the interference coefficient K is:
wherein R is 0 S is the reference electric signal obtained by the first optical probe under the standard condition 0 Is the dust concentration signal obtained by the second optical probe under the standard condition.
Further, the calculation formula of the actual dust concentration S is:
S＝S 1 -K*R 1 。
wherein R is 1 S is a reference electric signal acquired by the first optical probe during working measurement 1 And the dust concentration signal is obtained by the second optical probe during working measurement.
The beneficial effects of the utility model are as follows: according to the utility model, interference of environmental factors on a system is eliminated by adopting a reference method, information such as power, wavelength and the like of a light source can be obtained through the prism and the reflecting mirror, and real-time compensation of external environmental factors is simply and efficiently realized through comparison calculation. In addition, in the scheme of the utility model, the modularized design is adopted, each module can work independently, the factory debugging is convenient, and the on-site maintenance is convenient.
Drawings
The accompanying drawings, where like reference numerals refer to identical or similar parts throughout the several views and which are included to provide a further understanding of the present application, are included to illustrate and explain illustrative examples of the present application and do not constitute a limitation on the present application. In the drawings:
fig. 1 is a schematic structural view of an embodiment of the present utility model.
Wherein: 1. a controller; 2. a first optical probe; 3. a first receiving cylinder; 4. a collimated light source; 5. a mirror box; 6. a beam splitter; 7. a reflecting mirror; 8. a base; 9. a second receiving cylinder; 10. and a second optical probe.
Detailed Description
The particulate matter concentration detection apparatus shown in fig. 1 includes a measurement unit, a reference correction unit, and a controller 1 connected to the measurement unit and the reference correction unit, respectively; the following describes each unit in detail:
the measuring unit comprises a light source for emitting laser to the particles to be measured and a second optical probe 10 for receiving scattered light signals scattered by the dust particles to be measured, and converts the scattered light signals into measurement electric signals and sends the measurement electric signals to the controller 1. The light source may be a direct light source, and the second optical probe 10 is disposed at one end of the second receiving cylinder 9, and the other end of the second receiving cylinder 9 faces to the optical path of the scattered light signal emitted by the dust particle to be measured. Further, the other end of the second receiving cylinder 9 may be inclined toward the side where the light source is located, so that the second optical probe 10 may accurately receive the dust particle scattering signal.
The reference correction unit comprises a first optical probe 2 and a beam splitter which is used for dividing the light source into two light paths; the first optical probe 2 is disposed at one end of the first receiving cylinder 3, and the other end of the first receiving cylinder 3 faces the optical path of the other beam of light split by the beam splitter. The beam splitter may adopt a depolarization beam splitter prism, one beam of light (P polarized light) split by the depolarization beam splitter prism is emitted to dust particles to be detected, and the other beam of light (S polarized light) is received by the first optical probe 2 and then converted into a reference electrical signal, and then sent to the controller 1.
The controller 1 is respectively connected with the first optical probe 2 and the second optical probe 10, and is used for receiving the reference electric signal and the measurement electric signal, and obtaining a dust particle concentration signal through the reference electric signal and the measurement electric signal. The controller 1 comprises a microcontroller 1, an AD sampler, a power supply and an output unit, wherein the AD sampler, the power supply and the output unit are respectively connected with the microcontroller 1, and the first optical probe 2 and the second optical probe 10 are connected with the AD sampler through input end members.
According to one embodiment of the present application, the beam splitter and the reflecting mirror 7 are disposed in a transparent mirror box 5, and are disposed on the same side wall of the mirror box 5, and the first optical probe 2 and the light source are disposed on the other side wall of the mirror box 5 opposite to the beam splitter and the reflecting mirror 7.
The light source, the first receiving cylinder 3 and the second receiving cylinder 9 are all fixed on a base 8. By fixing the light source, the first receiving cylinder 3 and the second receiving cylinder 9 to a base 8. The base 8 of the utility model has compact structure, so that all parts are arranged on one component, the relative positions of the receiving cylinders are ensured, and the stability of system measurement is improved.
The working principle of the application is as follows:
the collimating light source 4 emits a beam of laser, the laser is divided into two beams of light by the spectroscope 6 placed in the laser when passing through the mirror box 5, one beam (P polarized light) is emitted to dust particles to be detected along the original direction, and the first optical probe 2 is used for receiving scattered light signals emitted by the dust particles to be detected and sending the received signals to the controller 1; the other beam (S polarized light) is emitted in the vertical direction, enters the second receiving tube 9 after entering the reflecting mirror 7, is received by the second optical probe 10, and the second optical probe 10 transmits the received signal to the controller 1 for processing.
The controller 1 drives the collimation light source 4 in a constant power mode and is responsible for signal acquisition, quantification and calculation of the first optical probe 2 and the second probe. The calculation method is as follows:
a stable set of signals is acquired under standard conditions, wherein the reference electrical signal acquired by the first optical probe 2 is marked as R 0 The electrical signal quantity acquired by the second optical probe 10 is marked as S 0 . By calculating to obtain interference
Coefficients:
during working measurement, the reference electric signal acquired by the first optical probe 2 is marked as R 1 The electric signal quantity mark S acquired by the second optical probe 10 1 The compensated dust signal is
S＝S 1 -K*R 1 。
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model.
Claims (7)
1. The particulate matter concentration detection device is characterized by comprising a measurement unit, a reference correction unit and a controller connected with the measurement unit and the reference correction unit respectively;
the measuring unit comprises a light source for emitting laser to the particles to be measured and a second optical probe for receiving scattered light signals emitted by the dust particles to be measured, and the scattered light signals are converted into dust concentration signals and then sent to the controller;
the reference correction unit comprises a first optical probe and a beam splitter, wherein the beam splitter is used for dividing the light source into two light paths; one beam of light split by the beam splitter is emitted to dust particles to be detected, and the other beam of light is received by the first optical probe and then converted into a reference electric signal, and then the reference electric signal is sent to the controller;
the controller is respectively connected with the first optical probe and the second optical probe and is used for receiving the reference electric signal and the dust concentration signal and obtaining a dust particle concentration signal through the reference electric signal and the dust concentration signal;
the method for detecting the concentration of the particulate matters by adopting the device for detecting the concentration of the particulate matters comprises the following steps:
s1: acquiring a reference electric signal and a dust concentration signal under standard conditions, and calculating an interference coefficient through the reference electric signal and the dust concentration signal;
s2: compensating a dust concentration signal in the working process according to the interference coefficient and a real-time reference electric signal obtained in the actual working process to obtain the actual dust concentration;
the calculation formula of the interference coefficient K is as follows:
wherein R is 0 S is the reference electric signal obtained by the first optical probe under the standard condition 0 The dust concentration signal is obtained by the second optical probe under the standard condition;
the calculation formula of the actual dust concentration S is as follows:
S＝S 1 -K*R 1
wherein R is 1 S is a reference electric signal acquired by the first optical probe during working measurement 1 And the dust concentration signal is obtained by the second optical probe during working measurement.
2. The particulate matter concentration detection apparatus of claim 1, wherein the beam splitter is a depolarizing beam splitter prism, the split P polarized light is emitted to the dust particles to be detected, and the S polarized light is reflected to the first optical probe by a reflecting mirror.
3. The particulate matter concentration detection apparatus according to claim 1 or 2, wherein the beam splitter and the reflecting mirror are provided in a transparent mirror box and are provided on the same side wall of the mirror box, and the first optical probe and the light source are provided on the other side wall of the mirror box opposite to the beam splitter and the reflecting mirror.
4. The particulate matter concentration detection apparatus according to claim 3, wherein the first optical probe is provided at one end of a first receiving cylinder, and the other end of the first receiving cylinder faces the optical path of the other beam of light split by the beam splitter.
5. The particulate matter concentration detection apparatus of claim 4, wherein the second optical probe is disposed at one end of the second receiving cylinder, and the other end of the second receiving cylinder faces the optical path of the scattered light signal emitted from the dust particle to be detected.
6. The particulate matter concentration detection apparatus according to claim 5, wherein the other end of the second receiving cylinder is disposed obliquely to the side on which the light source is located.
7. The particulate matter concentration detection apparatus of claim 1, wherein the controller includes a microcontroller, an AD sampler, a power supply, and an output unit respectively connected to the microcontroller, and the first and second optical probes are connected to the AD sampler through input end members.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811420656.3A CN109655386B (en) | 2018-11-26 | 2018-11-26 | Particulate matter concentration detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811420656.3A CN109655386B (en) | 2018-11-26 | 2018-11-26 | Particulate matter concentration detection device |
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| CN109655386A CN109655386A (en) | 2019-04-19 |
| CN109655386B true CN109655386B (en) | 2024-04-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110146423A (en) * | 2019-06-13 | 2019-08-20 | 厦门华厦学院 | Fine particle concentration detection device |
| CN112326561B (en) * | 2020-10-28 | 2022-09-20 | 歌尔股份有限公司 | Ellipsometer, test method and device thereof, and computer storage medium |
| CN114324095B (en) * | 2021-12-30 | 2023-10-24 | 中国石油大学(北京) | Monitoring device for particle impurity concentration in gas pipeline |
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