Particulate matter detection device, air detection device and purification equipment

Abstract

The utility model relates to the field of particulate matter detection, and discloses a particulate matter detection device, an air detection device and purification equipment. A light splitting sheet; part of the light rays are reflected to particulate matters in the air by the beam splitter, are reflected by the particulate matters, and are partially transmitted by the beam splitter to form transmission light; and the image acquisition equipment is used for receiving the transmission light.

Description

TECHNICAL FIELD

[0001] The utility model relates to particulate matter detection field, in particular to a kind of particulate matter detection device, air detection device and purification equipment. BACKGROUND

[0002] Particulate matter detection mode is generally using carbon soot particle sensor (Particulate Matter, PM) to detect particulate matter in air, specifically after particulate matter in air is inhaled PM sensor detection chamber, scattering light is generated by laser irradiation particulate matter, scattering light is received using a photosensitive element, and particulate matter particle size is obtained according to scattering light intensity.The mode can only realize the approximate measurement of particulate matter particle size because the dynamic range of light source is limited, and mainly detects small particle size particles, cannot cover the range of larger particle size completely, and cannot meet the demand of air quality monitoring. SUMMARY

[0003] Therefore, the utility model provides a kind of particulate matter detection device, air detection device and purification equipment, can realize the accurate detection of various particle size particulate matter, meet the demand of air quality monitoring.The specific scheme is as follows:

[0004] A kind of particulate matter detection device, comprising:

[0005] Light source for generating light;

[0006] Light splitting sheet; part of the light is reflected to particulate matter in air by the light splitting sheet, reflected by the particulate matter, partially transmitted by the light splitting sheet, and forms transmitted light;

[0007] Image acquisition device for receiving the transmitted light.

[0008] The utility model also provides an air detection device, comprising: detection device shell and the above-mentioned particulate matter detection device on the inner side wall of the detection device shell;

[0009] Further comprising: air detection device air inlet, and air detection device air outlet;

[0010] The particulate matter detection device is located between the air detection device air inlet and the air detection device air outlet.

[0011] The utility model also provides a kind of purification equipment, comprising: purification equipment shell, the above-mentioned particulate matter detection device on the inner side wall of the purification equipment shell or upper surface opening;

[0012] Further comprising: purification equipment air inlet, and purification equipment air outlet;

[0013] The particle detection device comprises an independent air duct composed of a particle detection device air inlet and a particle detection device air outlet;

[0014] When the particle detection device is located on the inner side wall of the purification equipment, the particle detection device is located between the purification equipment air inlet and the purification equipment air outlet; the particle detection device air inlet is close to the purification equipment air inlet, and the particle detection device air outlet is close to the purification equipment air outlet.

[0015] When the particle detection device is located at the upper surface opening of the purification equipment, the particle detection device air inlet is in the same plane as the purification equipment air inlet.

[0016] From the above technical solution, it can be seen that the particle detection device provided by the utility model comprises: a light source for generating light; a light splitting sheet; part of the light is reflected by the light splitting sheet to particles in the air, is reflected by the particles, is partially transmitted through the light splitting sheet, and forms transmitted light; and an image acquisition device for receiving the transmitted light.

[0017] The particle detection device provided by the utility model has the beneficial effects that after the light source generates light, the light splitting sheet splits the light, part of the split light is reflected to particles in the air, the particles reflect part of the light back to the light splitting sheet, the light splitting sheet splits the light again, and part of the transmitted light is transmitted to the image acquisition device.

[0018] In addition, the utility model also provides corresponding air detection devices and purification equipment for the particle detection device, which have the same or corresponding technical features as the above-mentioned particle detection device and have the same effects. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings needed in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only embodiments of the utility model, and those skilled in the art can obtain other drawings according to the provided drawings without creative labor.

[0020] Figure 1 The structure diagram of the particle detection device provided by the embodiment of the utility model is shown in the figure.

[0021] Figure 2The structure schematic diagram of the air detection device is provided for the embodiment of the utility model.

[0022] Figure 3 The structure schematic diagram of the purification equipment is provided for the embodiment of the utility model.

[0023] Wherein, 1 is a light source, 2 is a light splitting sheet, 3 is a particulate matter, 4 is an image acquisition device, 5 is a detection device shell, 6 is an air detection device airflow inlet, 7 is an air detection device airflow outlet, 8 is a ventilation assembly, 9 is a purification equipment shell, 10 is a filter screen, 11 is a fan component, 12 is a particulate matter detection device airflow inlet, 13 is a particulate matter detection device airflow outlet, 14 is a purification equipment airflow inlet, and 15 is a purification equipment airflow outlet. DETAILED DESCRIPTION

[0024] In some embodiments, the particulate matter detection scheme such as a PM sensor detects particulate matter in the air in the following manner: a fan generates an airflow to suck particulate matter in the air into a sensor detection chamber, a laser irradiates the particulate matter to generate scattered light, a photosensitive element receives the scattered light, and the size of the particulate matter can be obtained according to the light intensity of the scattered light. The above-mentioned PM sensor can only achieve rough measurement of the size of the particulate matter. A single light source is difficult to work well in a very large particle size range due to the limited dynamic range, and cannot completely cover the particle size range of interest. The above-mentioned scheme can only obtain information in one dimension of the size of the particulate matter, and can only distinguish the particulate matter according to the size of the particulate matter, and cannot specifically identify the type of the particulate matter. Moreover, the PM sensor mainly detects small particle size particles, and can only detect particulate matter in the particle size range of 0.3 μm-10 μm. As the air environment becomes more complex, many pollutants in the air, such as pollen, dust mites, dander, and pet hair, have a particle size greater than 10 μm, and different use scenarios pay attention to different types of air pollutants. The PM sensor cannot meet the current air quality monitoring requirements.

[0025] To solve the above technical problems, the utility model provides a kind of particulate matter detection device, air detection device and purification equipment, can realize the accurate detection of various particle size particulate matter.

[0026] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0027] Figure 1 The structure schematic diagram of the particulate matter detection device is provided for the embodiment of the utility model. As shown inFigure 1 The particle detection device provided by the utility model has the advantages of simple structure, convenient use, high detection accuracy, and high detection efficiency.

[0028] A light source 1 for generating light rays;

[0029] A light splitting sheet 2; part of the light rays is reflected by the light splitting sheet 2 to the particles 3 in the air, is reflected by the particles 3, is partially transmitted through the light splitting sheet 2, and forms transmitted light;

[0030] An image acquisition device 4 for receiving the transmitted light.

[0031] In the particle detection device provided by the embodiment of the utility model, the light source 1 generates light rays, the light splitting sheet 2 splits the light rays, part of the split light rays is reflected to the particles 3 in the air, the particles 3 reflect part of the light rays back to the light splitting sheet 2, the light splitting sheet 2 splits the light rays again, and part of the transmitted light is transmitted to the image acquisition device 4. In this way, the combination of the light source 1, the light splitting sheet 2 and the image acquisition device 4 can realize accurate detection of particles of various particle sizes, and the problem that the traditional PM sensor cannot accurately detect large-particle-size particles is solved, thereby meeting the air quality monitoring demand.

[0032] It should be noted that, on the light path, the light splitting sheet 2 is arranged on the transmission light path of the light rays generated by the light source 1, and the image acquisition device 4 is arranged on the transmission light path of the transmitted light formed by the light splitting sheet 2. After the light source 1 emits light rays, the light splitting sheet 2 can split the light rays into first reflected light and first transmitted light, the first reflected light is transmitted to the particles 3 in the air, and the first transmitted light can be absorbed by the black velvet on the opposite inner wall or directly transmitted out without processing. After receiving the first reflected light, the particles 3 in the air reflect the first reflected light again to obtain second reflected light, the second reflected light is transmitted to the light splitting sheet 2, the light splitting sheet 2 splits the second reflected light into second reflected light and second transmitted light (i.e. the transmitted light), the second reflected light can be ignored, the second transmitted light is transmitted to the image acquisition device 4, and the image acquisition device 4 can acquire the particle image.

[0033] In actual application, the light splitting sheet 2 can adopt a substrate close to the refractive index of air, or can reduce the loss of refracted light energy through a surface coating. In addition, the position and orientation of the image acquisition device 4 can be adjusted to adapt to the refraction problem.

[0034] Further, in the specific implementation, in the particle detection device provided in the embodiment of the utility model, the transmission light and the optical axis of the image acquisition device can be coaxial. That is to say, the second transmission light and the first reflection light can be understood as coaxial, and they can be on the same line with the optical axis of the image acquisition device 4. On the light path of the coaxial light, after the first reflection light reaches the particle 3, the reflection light of the rough surface of the particle 3 is chaotic, and the light rays are weakened when passing through the light splitting sheet, that is, the second transmission light has less light energy than the first reflection light, so that only a small amount of light reaches the image acquisition device 4, and there is a obvious dark block in the imaging.

[0035] It should be pointed out that in the utility model, the light coaxial with the image acquisition device 4 is screened, which can screen the light towards the object side and the image side at the same time, and proper use can make the visual detection more convenient and clear. The help of the visual system to capture the characteristics can be realized by screening the light, and the characteristics of the measured object are highlighted through the contrast of light and shade.

[0036] Further, in the specific implementation, in the particle detection device provided in the embodiment of the utility model, the light splitting sheet 2 can be a half-transmission half-reflection mirror. The half-transmission half-reflection mirror can reflect half of the light and transmit the other half, that is, the energy of the first reflection light and the second transmission light is the same, and the energy of the second reflection light and the second transmission light is the same. The half-transmission half-reflection mirror is selected for the light splitting sheet 2, which has good optical performance, can balance the transmission and reflection of light, can adjust the transmittance and reflectance according to specific requirements, meets the requirements of different optical systems, and has strong compatibility.

[0037] The image acquisition device 4 can be an image sensor that can acquire images, which can be a complementary metal oxide semiconductor (CMOS) image sensor or a charge-coupled device (CCD) image sensor, etc., and the magnification can be set to about 60 times, which can realize the detection of particles with a size of 15 to 80 microns. The image acquisition device 4 can also directly select a camera, and the magnification can also be set to about 60 times. The camera is used to directly convert the optical signal into an electrical signal, real-time acquisition of the particle image is realized, accurate determination of the particle size is realized, the surface characteristics of the particle can also be acquired in detail, and the type of the particle can be identified.

[0038] The light source 1 can be a light-emitting diode (LED) or other light sources. The wavelength range of the visible light emitted by the light source 1 can be 400 to 760 nm.

[0039] Further, in specific implementation, the particle detection device provided in the embodiments of the present application can further comprise: a ventilation assembly for guiding the particles 3 to a detection area; the detection area is located on the side of the light splitting sheet 2 facing the light source 1.

[0040] In implementation, the ventilation assembly can be a fan. The ventilation assembly can suck the particles 3 in the air and guide them into the detection area, which contains the transmission path of the first reflected light, so that the first reflected light can be transmitted to the particles 3 in the air. It should be noted that the present application can set the speed of the ventilation assembly according to the application scenario, and provide corresponding wind speed values.

[0041] Further, in specific implementation, the particle detection device provided in the embodiments of the present application can further comprise: a processor connected with the image acquisition device 4, inputting the images collected by the image acquisition device 4, and outputting image analysis results; and / or a controller electrically connected with the ventilation assembly.

[0042] In implementation, the input of the processor is the particle image collected by the image acquisition device. The image collected by the image acquisition device 4 can realize the identification of the particles, and the image recognition algorithm can realize the classification of the particles.

[0043] The above processor can pre-train an image recognition model, which can be obtained by inputting different kinds of particle image data sets into a convolutional neural network (CNN) for training. The convolutional neural network can be a deep network, such as ResNet, U-Net, combined with texture analysis method, and fully utilize the complex features on the surface of the particles. If real-time monitoring is required, YOLO or Faster R-CNN can be considered for rapid detection. The specific image recognition algorithm depends on the size of the data set, the real-time requirement of the task, and the complexity of the surface morphology. If the surface texture of the particles is significantly different, deep learning combined with texture analysis can obtain more accurate image analysis results, and accurately identify and distinguish the types of particles.

[0044] The utility model discloses can pass through the controller with the processor is connected to the ventilation assembly. The processor can obtain the total quantity value of particulate matter through image recognition algorithm, and the measurement of particulate matter concentration is exported. The processor can detect the concentration of particulate matter by using the total quantity value of particulate matter obtained in unit time and the wind speed value of ventilation assembly. In practical application, unit time can be set to 1 second, 1 minute, 1 hour or other time period, which is not limited. The processor can calculate the concentration of particulate matter according to the total quantity value of particulate matter obtained divided by the product of the wind speed value of ventilation assembly and the size of air inlet. The product of the wind speed value of ventilation assembly and the size of air inlet can be understood as the air flow. Dividing the total quantity value of particulate matter obtained by the detector in unit time by the air flow in unit time can confirm the concentration of particulate matter of each particle size. Real-time monitoring and analysis of the concentration of particulate matter in the user environment can provide more accurate data support for air quality monitoring.

[0045] In addition, the controller can dynamically adjust the wind speed of the ventilation assembly according to the comparison result of the particulate matter concentration fed back by the processor and the concentration threshold value to adapt to different application scenarios. The concentration threshold value can include a maximum concentration threshold value and a minimum concentration threshold value. Different wind speeds can be used in different concentration environments. When the particulate matter concentration fed back by the processor is greater than the maximum concentration threshold value, the processor can send a decrease instruction to the controller, and the controller adjusts the wind speed of the ventilation assembly to decrease to between the maximum concentration threshold value and the minimum concentration threshold value. When the particulate matter concentration fed back by the processor is less than the minimum concentration threshold value, the processor can send a decrease instruction to the controller, and the controller adjusts the wind speed of the ventilation assembly to increase to between the maximum concentration threshold value and the minimum concentration threshold value. In this way, the wind speed of the ventilation assembly can be controlled to detect ultra-low concentration particulate matter or ultra-high concentration particulate matter, and the system can work well, ensuring that the response time of the image acquisition device 4 is fast enough.

[0046] Further, in the specific implementation, in the above-mentioned particulate matter detection device provided by the utility model embodiment, as shown in Figure 1 The image acquisition device 4 can be located on the side of the light splitting sheet 2 away from the light source 1.

[0047] In the implementation, the light source 1 and the particulate matter 2 can be arranged on one side of the light splitting sheet 2, and the image acquisition device 4 can be arranged on the other side, so that the particulate matter 2 can receive the first reflected light, and the image acquisition device 4 can receive the second transmitted light.

[0048] Further, in the specific implementation, in the above-mentioned particulate matter detection device provided by the utility model embodiment, as shown in Figure 1 The light splitting sheet 2 and the light generated by the light source 1 form a preset inclination angle.

[0049] In implementation, the present application can set the inclination angle between the light splitting sheet 2 and the light generated by the light source 1. When the preset inclination angle is 45 degrees, i.e. the light splitting sheet 2 is placed at a 45-degree angle with the light generated by the light source 1, the symmetry, simplicity and ease of use are provided in the optical path design, which can conveniently divide the light into the first reflected light and the first transmitted light perpendicular to each other. This perpendicular light splitting method makes it easy to distinguish and utilize the optical path in space, and can naturally guide the reflected light path and the transmitted light path to different directions, and helps to realize the light splitting function in a relatively compact space, and provides stable light splitting effect. In some applications, the inclination angle can be adjusted or replaced by other optical elements according to the requirements to realize a more compact or efficient optical path design; when changing the inclination angle or replacing the design, the effects of light reflection, transmission, deviation and polarization should be fully considered, and the corresponding compensation design should be done.

[0050] In actual application, the present application can clean the lens surface by high-speed airflow after a unit time or when the image acquisition device 4 is largely blocked to affect detection, so as to avoid affecting the accuracy of subsequent detection.

[0051] Based on the same utility model concept, the present application also provides a particulate matter detection method. Since the principle of solving problems of the particulate matter detection method is similar to that of the above-mentioned particulate matter detection device, the implementation of the particulate matter detection method can be referred to the implementation of the particulate matter detection device, and the repeated parts will not be described here.

[0052] The particulate matter detection method provided by the present application is applied to a particulate matter detection device, which comprises a light source, a light splitting sheet and an image acquisition device. The particulate matter detection method can comprise the following steps:

[0053] Step one, controlling the light splitting sheet to act on the light generated by the light source, and reflecting part of the light to the particulate matter in the air; after receiving part of the light, the particulate matter generates reflected light;

[0054] Step two, controlling the light splitting sheet to act on the reflected light generated by the particulate matter to form transmitted light;

[0055] Step three, the image acquisition device receives the transmitted light.

[0056] The detection method of the above-mentioned particulate matter detection device provided by the present application can realize accurate detection of various particle sizes of particulate matter by executing steps one to three, which overcomes the problem that the traditional PM sensor cannot accurately detect large particle size particles, and can further meet the air quality monitoring requirements.

[0057] In some particulate matter detection methods, the particulate matter detection method can comprise the following steps:

[0058] The light source generates light rays;

[0059] The optical assembly partially reflects the light rays to particulate matters in the air to form reflected light of the particulate matters;

[0060] The optical assembly partially transmits the reflected light of the particulate matters to an image acquisition device.

[0061] The optical assembly can include the light splitting sheet and the like in the above embodiments. The detection method of the particulate matter detection device can achieve accurate detection of particulate matters of various particle sizes, and can overcome the problem that the traditional PM sensor cannot accurately detect large particle size particles, thereby meeting the air quality monitoring requirements.

[0062] In some embodiments, the particulate matter detection method can include the following steps:

[0063] An image analysis result is output according to the light signal acquired by the image acquisition device.

[0064] The image analysis result can include the type of particulate matter, the concentration of different types of particulate matter, and the like. The step of outputting the image analysis result according to the light signal acquired by the image acquisition device can be performed by a processor, which can be a processor of the image acquisition device, a processor of the particulate matter detection device, or a processor of the purification device.

[0065] The image recognition method used by the processor to output the image analysis result is described above, and will not be described here.

[0066] In some embodiments, the particulate matter detection method can include the following steps: a ventilation assembly generates an air flow, and the air flow guides the particulate matters to a target area. It can be understood that the ventilation assembly can be a fan of the particulate matter detection device or a fan of the purification device, and the target area can be the detection area in the above embodiments.

[0067] Based on the same utility model concept, the embodiments of the present application also provide an air detection device. Since the principle of solving the problem of the air detection device is similar to that of the above-mentioned particulate matter detection device, the implementation of the air detection device can be referred to the implementation of the particulate matter detection device, and the repeated parts will not be described here.

[0068] Figure 2 The structure diagram of the air detection device provided by the embodiments of the present application is shown in the figure. Figure 2As shown, the air detection device provided by the embodiment of the utility model, specifically can include: detection device shell 5, and the above-mentioned particulate matter detection device on the inner side wall of detection device shell 5;It can also include: air detection device airflow inlet 6, and air detection device airflow outlet 7;The particulate matter detection device is located between the air detection device airflow inlet 6 and the air detection device airflow outlet 7.

[0069] In the above-mentioned air detection device provided by the embodiment of the utility model, the accurate detection of various particle size particulate matters can be realized, the problem that the traditional PM sensor cannot accurately detect large particle size particles is got rid of, and then the air quality monitoring demand can be met.

[0070] It should be pointed out that the above-mentioned particulate matter detection device can be used as a part of air detection device alone, is installed on the inner side wall of the detection device shell 5 of air detection device.The ventilation assembly of particulate matter detection device itself can be directly used as the fan 8 of air detection device.The air detection device airflow inlet 6 and the air detection device airflow outlet 7 can be used as the airflow inlet and the airflow outlet of particulate matter detection device.

[0071] Compared with the traditional PM sensor, the corresponding surface feature database can be established for different allergens such as pollen, pet hair, mold and the like, to realize the classification of particulate matter types.The air detection device can detect the above-mentioned allergic source particles to alert people.

[0072] Based on the same utility model concept, the embodiment of the utility model further provides a kind of purification equipment, since the principle of the problem solved by the purification equipment is similar to the above-mentioned one particulate matter detection device, therefore the implementation of the purification equipment can be referred to the implementation of particulate matter detection device, and the repeated place is not described repeatedly.

[0073] Figure 3 The structure diagram of the purification equipment provided by the embodiment of the utility model is shown in Figure 6. Figure 3As shown, the utility model embodiment provides the purification equipment, can specifically include: the purification equipment shell 9, the above -mentioned particulate matter detection device on the inner side wall or the upper surface opening of the purification equipment shell 9, the particulate matter detection device includes the independent air duct that is formed by particulate matter detection device airflow inlet 12 and particulate matter detection device airflow outlet 13, still include: purification equipment airflow inlet 14 and purification equipment airflow outlet 15, when the particulate matter detection device is located on the inner side wall of the purification equipment, the particulate matter detection device is located between the purification equipment airflow inlet 14 and the purification equipment airflow outlet 15, the particulate matter detection device airflow inlet 12 is close to the purification equipment airflow inlet 14, and the particulate matter detection device airflow outlet 13 is close to the purification equipment airflow outlet 15, when the particulate matter detection device is located at the upper surface opening of the purification equipment, the particulate matter detection device airflow inlet 12 is in the same plane with the purification equipment airflow inlet 14.

[0074] In the above-mentioned purification equipment provided by the utility model embodiment, the accurate detection of various particle size particulate matters can be realized, the problem that the traditional PM sensor cannot accurately detect large particle size particles is got rid of, and then the air quality monitoring demand can be met.

[0075] In the specific implementation, in the above-mentioned purification equipment provided by the utility model embodiment, as shown, Figure 3 Still can include: filter screen 10 and fan parts 11, the filter screen 10 is located on the side of the particulate matter detection device away from the purification equipment airflow inlet 14, the fan parts 11 are located on the side of the filter screen 10 away from the particulate matter detection device, and the fan parts 11 are close to the purification equipment airflow outlet 15.

[0076] It should be noted that, as shown, Figure 3 The particulate matter detection device of the utility model has an independent air duct, so that the image acquisition equipment 4 needs uniform illumination conditions for shooting, but the air duct of the purifier device is large and complex. The particulate matter detection device can be installed as an independent module inside the purification equipment, and can be installed on the inner side wall or the upper surface opening of the purification equipment, and the installation position is the same as the PM sensor, preferably avoiding the air inlet and outlet. The ventilation assembly of the particulate matter detection device can be directly replaced by the fan parts 11 in the purification equipment, that is, the particulate matter detection device can discard its own ventilation assembly, saving cost.

[0077] Finally, it needs to be pointed out that in this paper, such as the first and second relationship terms are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the term "includes", "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "includes a" does not exclude the presence of additional identical elements in the process, method, article or equipment including the element.

[0078] The particle detection device, the air detection device and the purification equipment provided by the present application are described in detail above, the principle and implementation mode of the present application are described by applying specific examples in this paper, the description of the above examples is only used to help understand the method and core idea of the present application; at the same time, for the general technical personnel in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above is described, the content of the specification should not be understood as the limitation of the present application.

Claims

1. A particulate matter detection device, characterized by, Comprising: a light source for generating light rays; a light splitting sheet; part of the light rays are reflected by the light splitting sheet to particulate matters in the air, reflected by the particulate matters, partially transmitted by the light splitting sheet, forming transmitted light; an image acquisition device for receiving the transmitted light.

2. The particulate matter detection apparatus of claim 1, wherein The transmitted light is coaxial with the optical axis of the image acquisition device.

3. The particulate matter detection apparatus of claim 2, wherein Further comprising: a ventilation assembly for guiding the particulate matters to a detection area; the detection area is located on the side of the light splitting sheet facing the light source.

4. The particulate matter detection apparatus of claim 3, wherein Further comprising: a processor connected with the image acquisition device, and inputting the image acquired by the image acquisition device, outputting image analysis results; and / or a controller electrically connected with the ventilation assembly.

5. The particulate matter detection apparatus of claim 1, wherein The image acquisition device is located on the side of the light splitting sheet away from the light source.

6. The particulate matter detection apparatus of claim 1, wherein The light splitting sheet and the light rays generated by the light source form a preset angle of inclination.

7. The particulate matter detection apparatus of claim 1, wherein The light splitting sheet is a semi-transparent half mirror; The light source is a light emitting diode.

8. An air detection device, characterized by, Comprising: a detection device housing, and a particulate matter detection device as claimed in any one of claims 1 to 7 located on the inner side wall of the detection device housing; Further comprising: an air detection device air inlet, and an air detection device air outlet; The particulate matter detection device is located between the air detection device air inlet and the air detection device air outlet.

9. A purification apparatus, characterized by Comprising: a purification device housing, and a particulate matter detection device as claimed in any one of claims 1 to 7 located on the inner side wall of the purification device housing or at the opening on the upper surface of the purification device housing; Further comprising: a purification device air inlet, and a purification device air outlet; The particulate matter detection device comprises an independent air duct composed of a particulate matter detection device air inlet and a particulate matter detection device air outlet; When the particulate matter detection device is located on the inner side wall of the purification device, the particulate matter detection device is located between the purification device air inlet and the purification device air outlet; the particulate matter detection device air inlet is close to the purification device air inlet, and the particulate matter detection device air outlet is close to the purification device air outlet; When the particulate matter detection device is located at the opening on the upper surface of the purification device, the particulate matter detection device air inlet is in the same plane as the purification device air inlet.

10. The purification apparatus of claim 9, wherein Further comprising: a filter screen and a fan component; The filter screen is located on the side of the particulate matter detection device away from the purification device air inlet; The fan component is located on the side of the filter screen away from the particulate matter detection device; the fan component is close to the purification device air outlet.

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