CN210037540U - Particulate matter concentration detection device - Google Patents
Particulate matter concentration detection device Download PDFInfo
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- CN210037540U CN210037540U CN201821962406.8U CN201821962406U CN210037540U CN 210037540 U CN210037540 U CN 210037540U CN 201821962406 U CN201821962406 U CN 201821962406U CN 210037540 U CN210037540 U CN 210037540U
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- optical probe
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- particulate matter
- receiving cylinder
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Abstract
The utility model discloses a particulate matter concentration detection device, which comprises a measuring unit, a reference correcting unit and a controller connected with the measuring unit and the reference correcting unit respectively; the measurement unit comprises a light source for emitting laser to the particles to be measured and a second optical probe for receiving scattered light signals scattered by the dust particles to be measured, and the scattered light signals are converted into measurement electric signals and then sent to the controller; the reference correction unit comprises a first optical probe and a spectroscope which is used for dividing the light source into two light paths; one beam of light split by the spectroscope is emitted to the dust particles to be detected, and the other beam of light is received by the first optical probe, converted into a reference electrical 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 measurement electric signal and obtaining a dust particle concentration signal through the reference electric signal and the measurement electric signal.
Description
Technical Field
The utility model relates to a particulate matter concentration detection device.
Background
With the rapid development of national economy, smoke and dust are discharged into the atmosphere in many fields of industrial production, such as coal-fired power plants, cement and the like, in the production process, so that the environmental pollution is increasingly prominent, and the harmful effects are caused to the life and the body health of people. Therefore, the emission of the smoke concentration is limited, and 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 in an in-situ installation mode on an industrial field, and the in-situ installation mode can bring certain influence to dust equipment and influence the measurement precision due to the severe field environment. Low concentration measurements are particularly evident and thus increasing accuracy becomes more important.
As disclosed in published patent application nos.: 201510053394.1, publication No. CN104596904A describes a dust concentration measuring method of a laser dust sensor, which calibrates the laser dust sensor at normal temperature and records three indexes influencing the dust concentration measurement during calibration: the voltage value of the photoelectric sensor after passing through the first-stage amplifier, the comparison voltage value after passing through a blocking capacitor and a second-stage amplifier and the fan rotating speed; correcting factors such as attenuation of optical path devices, change of temperature and humidity and the like; correcting the rotating speed of a fan in the laser dust sensor; thereby obtaining the real-time dust measurement concentration of the laser dust sensor. The invention can greatly improve the measuring accuracy of the sensor by correcting and compensating each factor influencing the dust measuring concentration of the sensor in sequence.
According to the measuring method, influence factors such as attenuation, temperature and humidity of a photoelectric sensor and a light path device need to be contrasted and corrected, and complexity of the system is increased. Meanwhile, a large number of tests are needed to obtain a compensation result, so that the maintenance and related inspection of the instrument are burdened, and the operation of the online instrument is inconvenient.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a particulate matter concentration detection device to solve laser scattering dust meter in the course of the work, easily receive external factors such as ambient temperature, humidity, pressure to measuring signal's interference and lead to the problem that measuring error easily appears.
In order to solve the technical problem, the utility model provides a particulate matter concentration detection device, which comprises a measuring unit, a reference correcting unit and a controller connected with the measuring unit and the reference correcting unit respectively;
the measurement unit comprises a light source for emitting laser to the particles to be measured and a second optical probe for receiving scattered light signals scattered by the dust particles to be measured, and the scattered light signals are converted into measurement electric signals and then sent to the controller;
the reference correction unit comprises a first optical probe and a spectroscope which is used for dividing the light source into two light paths; one beam of light split by the spectroscope is emitted to the dust particles to be detected, and the other beam of light is received by the first optical probe, converted into a reference electrical 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 measurement electric signal and obtaining a dust particle concentration signal through the reference electric signal and the measurement electric signal.
Furthermore, the spectroscope is a depolarization beam splitter prism, the separated P polarized light is emitted to the dust particles to be detected, and the S polarized light is reflected to the first optical probe through a reflector.
Furthermore, the spectroscope and the reflector are arranged in a transparent mirror box and arranged on the same side wall of the mirror box, and the first optical probe and the light source are arranged on the other side of the mirror box opposite to the spectroscope and the reflector.
Furthermore, 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 light path of the other beam of light split by the beam splitter.
Furthermore, 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 light 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 of the light source.
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 which 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 elements.
The utility model has the advantages that: the invention eliminates the interference of environmental factors on the system by adopting a reference method, can acquire the information of power, wavelength and the like of the light source through the prism and the reflector, and simply and efficiently realizes the real-time compensation of the external environmental factors through the comparison calculation. In addition, in the scheme of the invention, the modular design is adopted, and each module can work independently, thereby being convenient for factory debugging and having the characteristic of convenient field maintenance.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
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 mirror; 8. a base; 9. a second receiving cylinder; 10. 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 measurement 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 the scattered light signals are converted into measurement electric signals and then sent to the controller 1. The light source can be a collimated 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 scattered from the dust particles to be measured. In addition, the other end of the second receiving cylinder 9 may be disposed to be inclined toward the side of the light source, so that the second optical probe 10 can accurately receive the scattering signal of the dust particles.
The reference correction unit comprises a first optical probe 2 and a spectroscope 6 which is used for dividing the light source into two light paths; the first optical probe 2 is arranged at one end of the first receiving cylinder 3, and the other end of the first receiving cylinder 3 faces to the light path of the other beam of light split by the beam splitter 6. The spectroscope 6 can be a depolarizing beam splitter prism, one beam of light (P polarized light) split by the depolarizing beam splitter prism is emitted to the dust particles to be measured, and the other beam of light (S polarized light) is received by the first optical probe 2, converted into a reference electrical signal and 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 configured to receive the reference electrical signal and the measurement electrical signal, and obtain a dust particle concentration signal through the reference electrical signal and the measurement electrical signal. The controller 1 comprises a microcontroller 1, an AD sampler, a power supply and an output unit which 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 elements.
According to an embodiment of the present application, the beam splitter 6 and the reflecting mirror 7 are disposed in a transparent mirror box 5, and 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 of the mirror box 5 opposite to the beam splitter 6 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 invention has compact structure, all parts are arranged on one component, the relative position of each receiving cylinder is ensured, and the stability of system measurement is improved.
The working principle of this application does:
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 box 5 when passing through the box, one beam (P polarized light) of the laser is emitted to the dust particles to be detected along the original direction, and the first optical probe 2 is used for receiving scattered light signals scattered 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 by adopting 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 denoted R0The quantity electrical signal acquired by the first optical probe 2 is marked S0. And calculating to obtain an interference coefficient:
in the working measurement, the reference electric signal acquired by the first optical probe 2 is marked as R1The quantity electric signal mark S acquired by the first optical probe 21Then the compensated dust signal is
S＝S1-K*R1。
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (6)
1. The particulate matter concentration detection device is characterized by comprising a measurement unit, a reference correction unit and a controller, wherein the controller is connected with the measurement unit and the reference correction unit respectively;
the measurement unit comprises a light source for emitting laser to the particles to be measured and a second optical probe for receiving scattered light signals scattered by the dust particles to be measured, and the scattered light signals are converted into measurement electric signals and then sent to the controller;
the reference correction unit comprises a first optical probe and a spectroscope which is arranged in a transparent mirror box and used for dividing the light source into two light paths; one beam of light split by the spectroscope is emitted to the dust particles to be detected, and the other beam of light is received by the first optical probe, converted into a reference electrical signal and sent to the controller;
the spectroscope is a depolarization beam splitter prism, the separated P polarized light is emitted to dust particles to be detected, and S polarized light is reflected to the first optical probe through a reflector; the reflecting mirror and the spectroscope are arranged in the same mirror box and arranged on the same side wall of the mirror box, and the first optical probe and the light source are arranged on the other side of the mirror box opposite to the spectroscope and the reflecting mirror;
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 measurement electric signal and obtaining a dust particle concentration signal through the reference electric signal and the measurement electric signal.
2. The particulate matter concentration detecting apparatus according to claim 1, wherein the first light probe is provided at one end of a first receiving cylinder, and the other end of the first receiving cylinder faces an optical path of the other light split by the beam splitter.
3. The particulate matter concentration detection apparatus according to claim 2, wherein the second optical probe is provided at one end of the second receiving cylinder, and the other end of the second receiving cylinder faces an optical path of a scattered light signal scattered from the dust particles to be measured.
4. The particulate matter concentration detection apparatus according to claim 3, wherein the other end of the second receiving cylinder is disposed obliquely to the side of the light source.
5. The particulate matter concentration detecting apparatus according to claim 4, wherein the light source, the first receiving cylinder, and the second receiving cylinder are fixed to a base.
6. The particulate matter concentration detection apparatus according to claim 1, wherein the controller includes a microcontroller, an AD sampler, a power supply, and an output unit, which are connected to the microcontroller, respectively, and the first and second optical probes are connected to the AD sampler through an input terminal member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821962406.8U CN210037540U (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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| CN201821962406.8U CN210037540U (en) | 2018-11-26 | 2018-11-26 | Particulate matter concentration detection device |
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| CN210037540U true CN210037540U (en) | 2020-02-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655386A (en) * | 2018-11-26 | 2019-04-19 | 重庆川仪分析仪器有限公司 | Particle concentration detection device and detection method |
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2018
- 2018-11-26 CN CN201821962406.8U patent/CN210037540U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655386A (en) * | 2018-11-26 | 2019-04-19 | 重庆川仪分析仪器有限公司 | Particle concentration detection device and detection method |
| CN109655386B (en) * | 2018-11-26 | 2024-04-02 | 重庆川仪分析仪器有限公司 | Particulate matter concentration detection device |
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