CN114002119A - Particulate matter sensor and control method thereof - Google Patents
Particulate matter sensor and control method thereof Download PDFInfo
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- CN114002119A CN114002119A CN202111442936.6A CN202111442936A CN114002119A CN 114002119 A CN114002119 A CN 114002119A CN 202111442936 A CN202111442936 A CN 202111442936A CN 114002119 A CN114002119 A CN 114002119A
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- 239000013618 particulate matter Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 49
- 238000004891 communication Methods 0.000 claims abstract description 17
- 230000001960 triggered effect Effects 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims description 26
- 238000001914 filtration Methods 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000009323 psychological health Effects 0.000 description 1
- 208000023504 respiratory system disease Diseases 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 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
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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
- G01N15/075—Investigating concentration of particle suspensions by optical means
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Abstract
The invention discloses a particulate matter sensor and a control method thereof. The invention adopts the laser scattering principle and utilizes an algorithm based on the Mie's theory to obtain the equivalent particle size of the particles and the number of the particles with different particle sizes in unit volume; displaying the currently measured concentration of the particulate matters on a built-in screen of the device; in addition, the user can select to start the sound-light alarm function, and when the concentration of the particulate matters reaches a set threshold value, the alarm function is triggered; the device is internally integrated with wireless and wired communication modes to communicate with external equipment.
Description
Technical Field
The invention belongs to the technical field of particulate matter concentration detection, and particularly relates to a particulate matter sensor and a control method thereof.
Background
With the continuous improvement of the living standard of people, people pay more and more attention to physical and psychological health; dust particles in the air can affect the health of people and easily cause various respiratory diseases, so that the air quality condition needs to be known in real time to help people to make preventive measures in time. Most of prior art encapsulates into the module form with dust detection, can not directly show particulate matter concentration under the current environment, and the user uses more difficultly, and the module size differs, does not have the standard.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a particle sensor, which solves the problems in the prior art that dust detection is packaged into a module form, the particle concentration in the current environment cannot be directly displayed, the use by a user is difficult, and the module sizes are different.
The invention also aims to provide a control method of the particulate matter sensor.
In order to achieve the purpose, the technical scheme of the invention is realized as follows: a particle sensor comprises a box body, a particle concentration detection module and a control module, wherein the box body is internally provided with an air inlet; when the gas containing the particulate matters enters the box body through the gas inlet and contacts the particulate matter concentration detection module, when the particulate matter concentration detection module detects that the concentration content of the current gas particulate matters exceeds an alarm value, the alarm module integrated in the control module is triggered to alarm, and the gas containing the particulate matters is linked with external equipment through a wireless communication protocol and/or a wired communication interface which are arranged in the control module to ventilate.
Preferably, the box body is further provided with a display module, and the display module is connected with the control module and used for displaying the current particulate matter concentration content value detected by the particulate matter concentration detection module.
Preferably, particulate matter concentration detection module includes lid, air flue subassembly, signal processing circuit board, photodiode, laser module, miniature fan and lower lid, go up the lid and be connected with lid down, from last air flue subassembly and the signal processing circuit board of connecting gradually extremely down in it, a terminal surface of signal processing circuit board is provided with photodiode, another terminal surface of signal processing circuit board is provided with laser module, miniature fan.
Preferably, the air flue component comprises an air flue inlet, a laser module, a light trap, an air flue outlet and an air flue shell, wherein the air flue inlet is formed in one side of the air flue shell, the laser module is arranged on one side of the air flue inlet, the light outlet end of the laser module is provided with the light trap, the air flue outlet is formed in the lower portion of the laser module, and the upper portion of the air flue outlet corresponds to the position of the micro fan.
Preferably, the light-emitting end of laser module is provided with side hole and below hole, the side hole is used for the laser module to shine the air that awaits measuring, produces the scattered light when meetting the particulate matter in the air that awaits measuring, the below hole is located photodiode's top for the scattered light that sends when the particulate matter in the air is shone to laser module transmission laser reaches photodiode through the below hole.
Preferably, the laser module is a red laser module with a wavelength of 650nm, a green laser module with a wavelength of 520nm or a blue laser module with a wavelength of 450nm, and comprises a metal shell and a built-in laser collimating lens.
Preferably, the signal processing circuit board is integrated with a driving circuit for driving the micro fan and a signal filtering and amplifying circuit, the micro fan driving circuit provides a stable voltage for the micro fan through a voltage stabilizing chip, and the signal filtering and amplifying circuit comprises an operational amplifier which performs two-stage amplification on a weak electrical signal output by the photodiode, so as to facilitate subsequent signal processing.
Preferably, the box body is further provided with a touch key connected with the control module and used for setting a particulate matter concentration alarm value.
The other technical scheme of the invention is realized as follows: a control method of the above particulate matter sensor, the control method comprising the steps of:
s1, starting the particulate matter sensor, and detecting the content of the current particulate matter concentration in real time by a particulate matter concentration detection module;
s2, judging whether the content of the current particulate matter concentration is within a particulate matter concentration threshold value of a preset value, if not, executing S, and if so, continuing to execute the current process;
and S3, when the preset value is exceeded, the control module triggers an alarm module integrated in the control module to alarm, and the alarm signal is linked with external equipment through a wireless communication protocol and/or a wired communication interface built in the control module to ventilate and transmit the gas concentration signal to a display module to display.
Compared with the prior art, the method adopts the laser scattering principle and utilizes an algorithm based on the Mie's theory to obtain the equivalent particle size of the particles and the number of the particles with different particle sizes in unit volume; displaying the currently measured concentration of the particulate matters on a built-in screen of the device; in addition, the user can select to start the sound-light alarm function, and when the concentration of the particulate matters reaches a set threshold value, the alarm function is triggered; the device is internally integrated with wireless and wired communication modes to communicate with external equipment.
Drawings
Fig. 1 is a schematic perspective view of a particle sensor provided in embodiment 1 of the present invention;
fig. 2 is an exploded schematic view of a particulate matter sensor provided in embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a particulate matter concentration detection module in a particulate matter sensor according to embodiment 1 of the present invention;
fig. 4 is a schematic structural diagram of an air duct assembly in a particulate matter sensor provided in embodiment 1 of the present invention;
fig. 5 is a schematic structural diagram of a laser module in a particle sensor provided in embodiment 1 of the present invention;
fig. 6 is a schematic structural diagram of a signal filtering and amplifying circuit in a particle sensor provided in embodiment 1 of the present invention;
fig. 7 is a schematic structural diagram of a micro fan driving circuit in a particle sensor according to embodiment 1 of the present invention;
fig. 8 is a flowchart of a particulate matter concentration measurement process of a particulate matter sensor according to embodiment 1 of the invention;
fig. 9 is a flowchart of the operation of the particulate matter concentration detection module provided in embodiment 1 of the present invention;
fig. 10 is a block flow chart of a control method of a particulate matter sensor according to embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not mean that the device or member to which the present invention is directed must have a specific orientation or position, and thus, cannot be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The particulate matter sensor provided by the embodiment of the invention comprises a box body 1, a particulate matter concentration detection module 2 and a control module 3, wherein the box body 1 is internally provided with an air inlet 11, and the particulate matter concentration detection module 2 is respectively connected with the control module 3; when gas containing particulate matters enters the box body 1 through the gas inlet 11 and contacts the particulate matter concentration detection module 2, when the particulate matter concentration detection module 2 detects that the concentration content of the current gas particulate matters exceeds an alarm value, the alarm module integrated in the control module 3 is triggered to alarm, and the gas containing the particulate matters is linked with external equipment through a wireless communication protocol and/or a wired communication interface built in the control module 3 to ventilate.
After adopting above-mentioned scheme, through set up particulate matter concentration detection module 2, control module 3 in box body 1, realized measuring indoor particulate matter concentration.
As shown in fig. 1 and 2, the box body 1 is further provided with a display module 5, and the display module 5 is connected with the control module 3 and is used for displaying the current particulate matter concentration content value detected by the particulate matter concentration detection module 2.
Like this, through integrateing alarm module in control module 3 to couple together display module 5 and control module 3, effectual realized reminding whether normal and the purpose of real-time demonstration indoor particulate matter concentration of indoor particulate matter concentration, and then promoted whole device's market competitiveness and quality.
As shown in fig. 3, the particulate matter concentration detection module 2 includes an upper cover 21, an air duct assembly 22, a signal processing circuit board 23, a photodiode 24, a laser module 25, a micro fan 26 and a lower cover 27, the upper cover 21 is connected with the lower cover 27, the air duct assembly 22 and the signal processing circuit board 23 are sequentially connected from top to bottom, one end surface of the signal processing circuit board 23 is provided with the photodiode 24, and the other end surface of the signal processing circuit board 23 is provided with the laser module 25 and the micro fan 26.
As shown in fig. 4, the air duct assembly 22 includes an air duct inlet 221, a laser module 222, a light trap 225, an air duct outlet 227 and an air duct housing 228, the air duct inlet 221 is disposed at one side of the air duct housing 228, the laser module 222 is disposed at one side of the air duct inlet 221, the light outlet of the laser module 222 is disposed with the light trap 225, the air duct outlet 227 is disposed below the laser module 222, and the upper side of the air duct outlet 227 corresponds to the position of the micro fan 26.
As shown in fig. 4, a light-emitting end of the laser module 222 is provided with a lateral hole 223 and a lower hole 224, the lateral hole 223 is used for the laser module 222 to irradiate air to be measured and generate scattered light when encountering particles in the air to be measured, the lower hole 224 is located above the photodiode 24, and the scattered light emitted when the laser module 222 emits laser light to irradiate the particles in the air reaches the photodiode 24 through the lower hole 224;
as shown in fig. 5, the laser module 222 is a red laser module with a wavelength of 650nm, a green laser module with a wavelength of 520nm, or a blue laser module with a wavelength of 450nm, and includes a metal housing 2221 and a built-in laser collimating lens 2222.
As shown in fig. 6 and 7, the signal processing circuit board 23 integrates a driving circuit for driving the micro fan and a signal filtering and amplifying circuit, the driving circuit of the micro fan provides a stable voltage for the micro fan through a voltage stabilizing chip U5, and the signal filtering and amplifying circuit includes an operational amplifier U2, which performs two-stage amplification on the weak electrical signal output by the photodiode 24, so as to facilitate subsequent signal processing.
The measurement flow on the signal processing circuit board is as shown in fig. 8 and fig. 9, after the module is initialized, the laser module 222 enters a modulation state, i.e., on for 0.5s and off for 0.5 s; within 0.5s of laser lighting, the photodiode 24 continuously receives scattered light generated by laser irradiation on the particulate matters and generates an electric signal, and after the time of 0.5s is over, the microprocessor reads a pulse count value and sends out a calculated particulate matter concentration value; and when the 1s period timing is finished, the module repeats the measurement operation. It should be noted that the settling time of the micro fan 26 should not be less than 30s to avoid the inaccuracy of the measurement result due to the difference of the wind speeds of the micro fans.
Further, the box body 1 is also provided with a touch key 6 connected with the control module 3 for setting a particulate matter concentration alarm value.
The use principle of the particulate matter sensor provided by the embodiment 1 of the invention is as follows:
the device is mainly installed on an indoor wall, air is extracted and sent into a designed air channel component 2 through a built-in micro fan 26, light emitted by a laser module 222 irradiates air to be detected through a side square hole 223, when particles exist in the air, the laser module 222 irradiates the particles to generate scattering, a photodiode 223 is used for receiving scattered light, an output signal of the photodiode 223 is in direct proportion to the intensity of the scattered light, and the equivalent particle size of the particles and the number of the particles with different particle sizes in unit volume are obtained by utilizing a Mie theory algorithm; the measured data is sent to an embedded display module 5 of the device for real-time display, and a wireless communication protocol and a wired communication interface are integrated in the device and can be linked with external equipment to perform ventilation and other operations.
Example 2
As shown in fig. 10, a control method of a particulate matter sensor according to embodiment 2 of the present invention includes the following steps:
s1, starting the particulate matter sensor, and detecting the content of the current particulate matter concentration in real time by the particulate matter concentration detection module 2;
s2, judging whether the content of the current particulate matter concentration is within a particulate matter concentration threshold value of a preset value, if not, executing S3, and if so, continuing to execute the current process;
and S3, when the preset value is exceeded, the control module 3 triggers an alarm module integrated in the control module (3) to alarm, and links an alarm signal with external equipment through a wireless communication protocol and/or a wired communication interface built in the control module 3 to ventilate, and transmits a gas concentration signal to the display module 5 to display.
According to the laser scattering principle, the equivalent particle size of the particles and the number of the particles with different particle sizes in unit volume are obtained by utilizing an algorithm based on the Mie's theory; displaying the currently measured concentration of the particulate matters on a built-in screen of the device; in addition, the user can select to start the sound-light alarm function, and when the concentration of the particulate matters reaches a set threshold value, the alarm function is triggered; the device is internally integrated with wireless and wired communication modes to communicate with external equipment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The particle sensor is characterized by comprising a box body (1) which is internally provided with an air inlet (11), a particle concentration detection module (2) and a control module (3), wherein the particle concentration detection module (2) is connected with the control module (3); when gas containing particles enters the box body (1) through the gas inlet (11) and contacts the particle concentration detection module (2), when the particle concentration detection module (2) detects that the concentration content of the current gas particles exceeds an alarm value, the alarm module integrated in the control module (3) is triggered to alarm, and the gas is linked with external equipment through a wireless communication protocol and/or a wired communication interface built in the control module (3) to ventilate.
2. The particle sensor according to claim 1, wherein a display module (5) is further arranged on the box body (1), and the display module (5) is connected with the control module (3) and is used for displaying the current particle concentration content value detected by the particle concentration detection module (2).
3. The particle sensor according to claim 2, wherein the particle concentration detection module (2) comprises an upper cover body (21), an air passage component (22), a signal processing circuit board (23), a photodiode (24), a laser module (25), a micro fan (26) and a lower cover body (27), the upper cover body (21) is connected with the lower cover body (27), the air passage component (22) and the signal processing circuit board (23) are sequentially connected with each other from top to bottom, the photodiode (24) is arranged on one end face of the signal processing circuit board (23), and the laser module (25) and the micro fan (26) are arranged on the other end face of the signal processing circuit board (23).
4. The particle sensor according to claim 3, wherein the air channel assembly (22) comprises an air channel inlet (221), a laser module (222), a light trap (225), an air channel outlet (227) and an air channel shell (228), the air channel inlet (221) is arranged on one side of the air channel shell (228), the laser module (222) is arranged on one side of the air channel inlet (221), the light trap (225) is arranged at the light outlet end of the laser module (222), the air channel outlet (227) is arranged below the laser module (222), and the position of the air channel outlet (227) corresponds to the position of the micro fan (26).
5. The particle sensor according to claim 4, wherein a side hole (223) and a lower hole (224) are arranged at the light emitting end of the laser module (222), the side hole (223) is used for the laser module (222) to irradiate the air to be measured and generate scattered light when encountering the particles in the air to be measured, and the lower hole (224) is positioned above the photodiode (24) and is used for the scattered light emitted when the laser module (222) emits laser to irradiate the particles in the air to reach the photodiode (24) through the lower hole (224).
6. A particle sensor as claimed in claim 5, wherein said laser module (222) is a 650nm wavelength red laser module, a 520nm wavelength green laser module or a 450nm wavelength blue laser module, comprising a metal housing (2221) and a built-in laser collimating lens (2222).
7. The particle sensor according to claim 6, wherein the signal processing circuit board (23) integrates a driving circuit for driving the micro fan and a signal filtering and amplifying circuit, the micro fan driving circuit provides a stable voltage for the micro fan through a voltage stabilizing chip, and the signal filtering and amplifying circuit comprises an operational amplifier which performs two-stage amplification on the weak electrical signal output by the photodiode (24) for facilitating subsequent signal processing.
8. A particle sensor as claimed in claim 7, characterised in that the cartridge (1) is further provided with a touch button (6) connected to the control module (3) for setting a particle concentration alarm value.
9. A control method of the particulate matter sensor according to any one of claims 1 to 8, characterized by comprising the steps of:
s1, starting the particulate matter sensor, and detecting the content of the current particulate matter concentration in real time by the particulate matter concentration detection module (2);
s2, judging whether the content of the current particulate matter concentration is within a particulate matter concentration threshold value of a preset value, if not, executing S3, and if so, continuing to execute the current process;
and S3, when the preset value is exceeded, the control module (3) triggers an alarm module integrated in the control module (3) to alarm, and the alarm signal is linked with external equipment through a wireless communication protocol and/or a wired communication interface built in the control module (3) to ventilate, and the gas concentration signal is transmitted to the display module (5) to be displayed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111442936.6A CN114002119A (en) | 2021-11-30 | 2021-11-30 | Particulate matter sensor and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111442936.6A CN114002119A (en) | 2021-11-30 | 2021-11-30 | Particulate matter sensor and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114002119A true CN114002119A (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111442936.6A Pending CN114002119A (en) | 2021-11-30 | 2021-11-30 | Particulate matter sensor and control method thereof |
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| CN (1) | CN114002119A (en) |
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2021
- 2021-11-30 CN CN202111442936.6A patent/CN114002119A/en active Pending
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