WO2020119600A1

WO2020119600A1 - Image acquisition device and detection apparatus for particulate matter in liquid

Info

Publication number: WO2020119600A1
Application number: PCT/CN2019/123649
Authority: WO
Inventors: 李剑平; 陈涛
Original assignee: 中国科学院深圳先进技术研究院
Priority date: 2018-12-14
Filing date: 2019-12-06
Publication date: 2020-06-18
Also published as: CN111323360B; CN111323360A

Abstract

Provided are an image acquisition device and a detection apparatus for particulate matter in liquid. The image acquisition device comprises a detection liquid container (1), a light source (2), and a photographing device (3). The detection liquid container (1) is used for accommodating a liquid having particulate matter, and the liquid flows in a specific flow direction in the detection liquid container (1); the light source (2) is used for irradiating the liquid, so that light scatters on the particulate matter in the liquid; and the photographing device (3) is used for photographing image of the particulate matter, on which light scatters, in the liquid; the direction of the optical axis coincides with the specific flow direction, avoiding streaking and blurring of an image due to the speed of the the particulate matter in the flow direction being too high, reducing the influence of streaking and blurring on said acquisition device, thereby improving the flow speed of the particulate matter, improving the imaging flux, and improving the detection efficiency. The dark-field imaging manner can improve the contrast and signal-to-noise ratio of the image of the particulate matter, and performs imaging on the basis of particulate matter in a fluid, thus having the advantages of not being affected by the type of particulate matter and adapting to an external environment having a great disturbance.

Description

Image acquisition equipment and detection device for particles in liquid

Technical field

The present invention relates to the technical field of detection of particulate matter in liquid, and in particular to image acquisition equipment and detection device for particulate matter in liquid.

Background technique

The optical imaging method is characterized by its non-contact nature and the ability to quickly obtain high-resolution images of particulate matter. It has broad application prospects in the study of plankton, small aquatic organisms and microplastics in liquids.

In the prior art, an optical imaging system such as a flow microscopic imaging system is often used in the detection equipment for particles in a liquid, and a light-transmitting sample flow cell is provided for the liquid with particles to flow in the sample flow cell, and Set the light source to enter the light from the side that irradiates the sample flow cell, so that the light passing through the liquid in the sample flow cell enters the camera for imaging, and then use a computer or other image analysis equipment to analyze the image taken by the camera to obtain information on the corresponding particulate matter . Wherein, the liquid in the sample flow cell is located on the object-side focal plane of the camera, and the flow direction of the liquid is parallel to the object-side focal plane of the camera. Therefore, when the flow velocity of the liquid in the sample flow cell is too fast, the displacement speed of the particles on the focal plane of the object side of the camera is too fast, it is easy to cause the smearing of particles in the image acquired by the camera, which makes the image analysis equipment The information of the particulate matter cannot be correctly parsed. If the flow rate of the liquid is limited, the working efficiency of the detection device will be reduced due to the low flux, and it is difficult to analyze a large amount of liquid.

Summary of the invention

In view of this, the object of the present invention is to provide an image acquisition device and a detection device for particles in a liquid to solve the above-mentioned problems.

In order to achieve the above objectives, the present invention adopts the following technical solutions:

An image acquisition device for particles in a liquid, the image acquisition device includes: a liquid measurement container, a light source, and a shooting device, wherein the liquid measurement container is used to contain a liquid with particulate matter, and the liquid is in the liquid measurement container The light flows in a specific flow direction; the light source is used to irradiate the liquid to cause light scattering of the particles in the liquid; the shooting device, the direction of the optical axis of the shooting device coincides with the specific flow direction, so The photographing device is used to photograph an image of particulate matter where light scattering occurs in the liquid.

Preferably, the liquid measuring container includes a temporary storage tube and a sampling tube provided in the temporary storage tube, a predetermined distance between the bottom end of the sampling tube and the bottom end of the temporary storage tube, the The bottom end of the sampling tube is open to communicate with the temporary storage tube; wherein, the liquid flows into the temporary storage tube through the bottom end of the sampling tube.

Preferably, the light center plane of the light source coincides with the object-side focal plane of the shooting device.

Preferably, the plane of the bottom end of the light beam emitted by the light source coincides with the plane of the bottom end of the sampling tube.

Preferably, the image acquisition device further includes a liquid supply container in communication with the liquid measurement container, and the liquid supply container is used to supply the liquid with particulate matter to the liquid measurement container.

Preferably, the image acquisition device further includes a pressure pump in communication with the bottom end of the liquid supply container and a liquid augmentation container in communication with the pressure pump, the pressure pump is used to transfer the liquid in the liquid augmentation container Inject into the liquid supply container.

Preferably, the image acquisition device further includes: a negative pressure pump and a waste liquid container communicating with the bottom end of the liquid measuring container, the negative pressure pump communicating with the waste liquid container to adjust the waste liquid container The air pressure inside.

Preferably, the waste liquid container includes a plurality of child waste liquid containers, and the plurality of child waste liquid containers communicate with each other.

Preferably, the shooting device includes a telecentric lens, and the depth of field of the telecentric lens is within the illumination range of the light source in the specific flow direction.

The present invention also provides a device for detecting particulate matter in a liquid. The detection device includes an image analysis device and an image acquisition device as described above. The image analysis device is configured to receive an image of the particulate matter captured by the shooting device, and The analysis is based on the image of the particulate matter.

The image acquisition device and detection device for particulate matter in a liquid provided by the present invention, by setting a sample measuring container to make the liquid as a sample flow in a specific flow direction, and setting a light source to irradiate the particulate matter in the liquid to cause light scattering of the particulate matter, A photographing device whose optical axis direction coincides with the specific flow direction collects an image of the light-scattering particulate matter for analysis by the image analysis device. It effectively solves the problem that the speed of the particulate matter in the flow direction is too fast and the image of the particulate matter is smeared, which makes it possible to use the image acquisition device to collect the image of the particulate matter without lifting the conditions. Flow speed to improve imaging flux, improve detection efficiency, and save detection time. At the same time, the above scheme uses dark field imaging to improve the contrast and signal-to-noise ratio of the obtained particulate image, and based on imaging the particulate in the fluid, it has the advantages of not being affected by the type of particulate in the liquid and adapting to the environment with large external disturbances. .

BRIEF DESCRIPTION

1 is a schematic structural diagram of an image acquisition device for particulate matter in a liquid provided by an embodiment of the present invention;

2 is an exemplary optical path diagram of a light source on one side of the image acquisition device illuminating the liquid in the liquid measuring container;

3 is an exemplary layout diagram of the light source;

FIG. 4 is an exemplary connection diagram of sub-liquid waste containers in the waste liquid container.

detailed description

To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments of the present invention are described in detail below with reference to the drawings. Examples of these preferred embodiments are illustrated in the drawings. The embodiments of the present invention shown in the drawings and described according to the drawings are merely exemplary, and the present invention is not limited to these embodiments.

Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the structures and/or processing steps closely related to the solution according to the present invention are shown in the drawings, and the relationship is omitted. Not much other details.

Referring to FIG. 1 and FIG. 2, this embodiment provides an image acquisition device for particles in a liquid. The image acquisition device includes a liquid measuring container 1, a light source 2, and a shooting device 3.

Wherein, the liquid measuring container 1 is used for containing liquid with particulate matter, and the liquid flows in the liquid measuring container 1 along a specific flow direction;

The light source 2 is used to irradiate the liquid to cause light scattering of the particles in the liquid;

The direction of the optical axis of the photographing device 3 coincides with the specific flow direction, and the photographing device 3 is used for photographing an image of particulate matter in which light scattering occurs in the liquid.

An image acquisition device for particles in a liquid provided by an embodiment of the present invention uses the principle of dark field illumination imaging to make the liquid in the liquid measuring container 1 flow as a sample in a specific flow direction, and the particles in the liquid flow through Light scattering occurs in the light range of the light source 2, and the image of the light-scattered particles is collected by the shooting device 3, so that the image analysis equipment 7 such as a computer can analyze the image to obtain the shape, size, and Information such as concentration and particle size distribution. Compared with the bright field imaging scheme in the prior art, the image acquisition device is based on the principle of dark field imaging, which can not only obtain the detailed information of the texture of the particulate matter and flagella, but also have the advantages of improving the contrast and granularity of the acquired particulate image. Advantages of signal-to-noise ratio. And importantly, since the direction of the optical axis of the shooting device 3 of the image acquisition device coincides with the specific flow direction, that is, particles flow along the direction of the optical axis of the shooting device 3 with the liquid, it is possible to avoid the occurrence of particles in the captured image. Excessive speed results in smearing of particles, which can be used to increase the flow rate of particles without being restricted by this factor, which can greatly increase the imaging flux of the image acquisition device and quickly obtain high quality of all particles in large volumes of liquid Image.

The image acquisition device is suitable for particles with a size range of 500 μm to 20 mm. The image acquisition device is based on the principle of fluid imaging and has the advantage of not being affected by the type of particles in the liquid. It can not only perform suspended particles without swimming ability Imaging can also image living plankton with strong swimming ability. In addition, it does not need to wait for the particulate matter to settle to the bottom of the liquid measurement container to collect images. The external interference has little effect on the normal operation of the image collection device. The image acquisition device can be applied to on-site environments such as floating row and scientific research ship.

Specifically, the liquid measuring container 1 includes a temporary storage tube 12 and a sampling tube 11 disposed in the temporary storage tube 12, the bottom end of the sampling tube 11 and the bottom end of the temporary storage tube 12 There is a predetermined distance between them, and the bottom end of the sampling tube 11 is open to communicate with the temporary storage tube 12; wherein, the liquid flows into the temporary storage tube 12 via the bottom end of the sampling tube 11. With the structure that the temporary storage tube 12 in the liquid measuring container 1 is sleeved on the sampling tube 11, the liquid can flow out from the bottom end of the sampling tube 11 under the obstruction of the bottom end of the temporary storage tube 12 From the bottom end of the temporary storage tube 12 to the surroundings, the liquid that has undergone image acquisition quickly moves away from the field of view of the shooting device 3, avoiding it from affecting the captured image. The predetermined distance between the bottom end of the sampling tube 11 and the bottom end of the temporary storage tube 12 needs to be determined according to the maximum particle size of the captured particulate matter. If the predetermined distance is too large, the captured particulate matter passes through the sample After the tube 11, it is difficult to stay away from the field of view of the shooting device 3 in a short period of time, increasing the probability that the light emitted by the focal plane target is blocked by particles within a predetermined distance; if the predetermined distance is less than the particle size of the largest particle, the shot Particulate matter may not flow out from the bottom end of the sampling tube 11, causing blockage, blocking imaging, and also damaging the form of relatively weak particulate matter. Preferably, the predetermined distance is set equal to the particle size of the largest particulate matter. In addition, in order to allow the light source 2 to irradiate the liquid through the liquid measuring container 1, the sampling tube 11 and the temporary storage tube 12 are highly transparent containers.

As shown in FIG. 2, in this embodiment, the light source 2 uses a light source with a small divergence angle, and the light center plane 20 of the light source coincides with the object-side focal plane of the shooting device 3. For example, as shown in FIG. 2, the light center plane 20 is located at the center of the exemplary light paths a and b on both sides of the edge of the illumination range, and the object-side focal plane of the shooting device 3 coincides with the light center plane 20, The depth of field of the shooting device 3 is matched with the illumination range of the light source 2, which can ensure that the particles within the depth of field of the shooting device 3 are all within the illumination range of the light source 2, so that a clear image of particles can be captured. Further, by making the optical path of the light generated by the light source 2 perpendicular to the optical axis of the shooting device 3, the light generated by the light source 2 is prevented from entering the shooting device 3 and affecting the captured image.

Exemplarily, referring to FIG. 3, the light source 2 includes more than two illuminators 21 that are arranged around the liquid measuring container 1 at an equal angle with each other. In this embodiment, three strips are selected. The illuminator 21 is embedded in the light source bracket, so that the three illuminators 21 surround the liquid measuring container 1, so that the illumination range of the three illuminators 21 completely covers the liquid measuring container 1 The cross-section of the test area, for example, as shown in FIG. 3, if the sampling tube 11 of the liquid measuring container 1 selects a cylindrical tubular container, the three illuminators 21 produce overlapping areas of the illumination range The area is larger than the cross-sectional area of the sampling tube 11, and all positions on the edge of the sampling tube 11 are within the illumination range. In order to reduce the motion blur caused by the radial movement of the particles, the shooting device 3 needs to be exposed for a short time, so the illuminator 21 needs to use a high-intensity illuminator. In addition, the light source 2 may be a monochromatic light source or a color light source composed of at least three illuminators 21 corresponding to the three primary colors, which are respectively used to obtain a grayscale image or a color image of the particulate matter.

Further, the plane of the bottom end of the light beam emitted by the light source 2 coincides with the plane of the bottom end of the sampling tube 11. Prevent the phenomenon that unilluminated particles block the imaging, and improve the signal-to-noise ratio and contrast of the image.

Specifically, the shooting device 3 includes a telecentric lens 31 whose depth of field matches the illumination range of the light source 2 in the specific flow direction, preferably, the depth of field of the telecentric lens 31 It coincides with the light range of the light source 2 in the specific flow direction. The telecentric lens 31 can make the magnification of the image acquired in the depth of field range the same. When the depth of field matches the illumination range, even if the light scattering particles in the liquid are at different heights in the sampling tube 11, the shooting In the image taken by the device 3 through the telecentric lens 31, the imaging magnification of all particles is the same, and there will be no deviation due to the difference in distance from the telecentric lens 31, thereby avoiding the particles caused by the above reasons. Has an error in the size information. For example, when the light source 2 is configured as the above-mentioned light source composed of three strip-shaped illuminators, the two focusing planes used to define the depth of field range of the telecentric lens 31 are respectively The optical paths a and b coincide.

Further, the image acquisition device further includes a liquid supply container 4 communicating with the liquid measuring container 1, and the liquid supply container 4 is used to supply the liquid with particulate matter to the liquid measuring container 1. The liquid supply container 4 is in communication with the top of the sampling tube 11 of the liquid measuring container 1. Specifically, the liquid supply container 4 is a container whose volume is much larger than that of the sampling tube 11, so that a sufficient amount of Liquid for high-throughput imaging.

Furthermore, the image acquisition device further includes a pressure pump 51 communicating with the bottom end of the liquid supply container 4 and a liquid increasing container 5 communicating with the pressure pump 51, and the pressure pump 51 is used to The liquid in the liquid increasing container 5 is injected into the liquid supply container 4. The pressure pump 51 injects the liquid in the liquid supply container 4 from the bottom end of the liquid supply container 4, on the one hand, the liquid at the bottom of the liquid supply container 4 flows to prevent the liquid supply container 4 from The particulate matter settles on the bottom of it, avoiding the concentration of particulate matter entering the sample tube 11 and affecting the imaging, thereby avoiding affecting the accuracy of the detection results; on the other hand, by supplementing the liquid supply container 4 with liquid, it can be controlled The liquid level in the liquid supply container 4 further controls the speed of the liquid flowing in the sampling tube 11. The liquid can be selected from pure water, pure sea water, and liquid as a sample, which does not interfere with particulate matter. Of course, as another embodiment, if it is only considered to prevent the particulate matter in the liquid supply container 4 from sinking to the bottom, it may also be disturbed only by injecting gas into the bottom of the liquid supply container 4 through the pressure pump 51 The liquid at the bottom of the liquid supply container 4 serves to avoid the influence of imaging on the sample tube 11 due to the concentration of the particulate matter. As yet another embodiment, the image acquisition device further includes a rotary blade immersed in the bottom of the liquid supply container 4 and a motor electrically connected to the rotary blade, the motor is used to drive the rotary blade in The liquid supply container 4 rotates to disturb the liquid at the bottom of the liquid supply container 4.

Further, the image acquisition device further includes: a negative pressure pump 61 and a waste liquid container 6 communicating with the bottom end of the liquid measuring container 1. The waste liquid container 6 is a closed container, which has a good sealability, so The negative pressure pump 61 communicates with the waste liquid container 6 to adjust the air pressure in the waste liquid container 6, and the air pressure in the waste liquid container 6 can be used to indirectly regulate the flow of liquid in the liquid measurement container 1 Speed, to avoid damage to vulnerable particles in the liquid, such as sea snow and other samples. The liquid collected in the waste liquid container 6 can be used for recycling to avoid the waste of samples.

In order to ensure that the negative pressure pump 61 can be used to regulate the flow rate of the liquid in the liquid measuring container 1 during the same inspection, the volume of the waste liquid container 6 needs to be large enough. Exemplarily, as shown in FIG. 4, the waste liquid container 6 includes a plurality of sub-waste liquid containers 60, and the plurality of sub-waste liquid containers 60 are connected to each other according to a certain rule, for example, by serial connection in series or by one sub-waste The liquid container 60 is connected in parallel with a plurality of child waste liquid containers 60 and the like to increase the volume of the waste liquid container 6 by increasing the number of the connected child waste liquid containers 60.

The image acquisition device for the particulate matter in the liquid further includes a bracket 8 to fix the liquid measurement container 1, the light source 2, the photographing device 3, and the liquid supply container 4 at corresponding positions of the bracket 8 so that the liquid measurement container 1 The extension direction of is consistent with the direction of gravity, and the liquid can naturally flow along the specific flow direction under the action of gravity. The bracket 8 is selected from a light-weight and high-strength aluminum bracket, and each assembly position on the bracket 8 is adjustable. Of course, as other embodiments, the driving device may also drive the liquid to flow in the specific flow direction.

An exemplary use process of the image acquisition device based on the particulate matter in the liquid is as follows: First, pure sea water is injected into the sample container 1 through the liquid supply container 4 until the sea water does not pass through the sampling tube 11 of the sample container 1 Corresponds to the depth of field of the shooting device 3; then, the liquid supply container 4 injects the liquid as the sample to be tested into the sampling tube 11 of the sample container 1, so that the shooting device 3 performs shooting and passes the control The pump valve causes the liquid to flow. After the liquid as the sample to be tested completely flows out of the sample container 1, pure sea water is injected into the sample container 1 again until the image captured by the shooting device 3 No more particles appear, stop shooting and close the pump valve to complete the image acquisition.

The present invention also provides a device for detecting particulate matter in a liquid. The detection device includes an image analysis device 7 and an image acquisition device as described above. The image analysis device 7 is configured to receive particles captured by the shooting device 3. Image, and analyze based on the image of the particulate matter.

The components in the above-mentioned device for detecting particulate matter in a liquid can be divided into the following modules: an imaging unit, a sampling unit, a disturbance unit, a fluid control unit, and an image analysis unit, wherein the imaging unit is composed of the light source 2 and the shooting device 3, the sampling unit is composed of the liquid measuring container 1 and the liquid supply container 4, the disturbance unit is composed of the pressure pump 51 and the liquid increase container 5, the fluid control unit is composed of The negative pressure pump 61, the waste liquid container 6, the liquid supply container 4, the pressure pump 51, and the booster container 5 are configured, and the image analysis unit is configured by the image analysis device.

In the above device for detecting particulate matter in liquid, the frame rate of the shooting device 3 and the flow rate of the liquid in the sampling tube 11 follow the relationship between the following parameters:

f=v/(1*s)

Where f is the frame rate of the shooting device 3, v is the flow rate of the liquid in the sampling tube 11, 1 is the depth of field of the shooting device 3, and s is the cross-sectional area of the sampling tube 11, ie The frame rate of the shooting device 3 is equal to the flow rate of the liquid in the sampling tube 11 divided by the product of the depth of field of the shooting device 3 and the cross-sectional area of the sampling tube 11. Therefore, when the depth of field of the sampling tube 11 and the shooting device 3 is selected, the frame rate f of the shooting device 3 and the flow rate v of the liquid in the sampling tube 11 are adjusted to ensure the measurement data Accuracy, and according to this formula, after setting the parameters of one of the frame rate f of the shooting device 3 and the flow rate v of the liquid in the sampling tube 11, the other party can be fed back according to the above relationship Parameters.

In summary, the image acquisition device and detection device for particulate matter in liquid provided by the present invention, by providing a sample measuring container 1 to allow the liquid as a sample to flow in a specific flow direction, and a light source 2 to irradiate particulate matter in the liquid To cause light scattering of the particulate matter, the imaging device 3 whose optical axis direction coincides with the specific flow direction collects an image of the light scattering particulate matter for analysis by the image analysis device 7. It effectively solves the problem that the speed of the particulate matter in the flow direction is too fast and the image of the particulate matter is smeared, which makes it possible to use the image acquisition device to collect the image of the particulate matter without lifting the conditions. Flow speed to improve imaging flux, improve detection efficiency, and save detection time. At the same time, the above scheme uses dark field imaging to improve the contrast and signal-to-noise ratio of the obtained particulate image, and based on imaging the particulate in the fluid, it has the advantages of not being affected by the type of particulate in the liquid and adapting to the environment with large external disturbances. .

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations There is any such actual relationship or order. Moreover, the terms "include", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also those not explicitly listed Or other elements that are inherent to this process, method, article, or equipment. Without more restrictions, the element defined by the sentence "include one..." does not exclude that there are other identical elements in the process, method, article or equipment that includes the element.

The above is only the specific implementation of this application. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of this application, several improvements and retouches can be made. These improvements and retouches also It should be regarded as the scope of protection of this application.

Claims

An image acquisition device for particles in a liquid, wherein the image acquisition device includes:

A liquid measuring container (1) for containing liquid with particulate matter, and the liquid flows in a specific flow direction in the liquid measuring container (1);

The light source (2) is used to irradiate the liquid to cause light scattering of the particles in the liquid;

A photographing device (3), the direction of the optical axis of the photographing device (3) coincides with the specific flow direction, and the photographing device (3) is used to photograph an image of a particulate matter in which light scattering occurs in the liquid.
The image acquisition device according to claim 1, wherein the light center plane of the light source (2) coincides with the object-side focal plane of the shooting device (3).
The image acquisition device according to claim 2, wherein the plane of the bottom end of the light beam emitted by the light source (2) coincides with the plane of the bottom end of the sampling tube (11).
The image acquisition device according to claim 1, wherein the liquid measuring container (1) includes a temporary storage tube (12) and a sampling tube (11) provided in the temporary storage tube (12), the There is a predetermined distance between the bottom end of the sampling tube (11) and the bottom end of the temporary storage tube (12), and the bottom end of the sampling tube (11) is open to communicate with the temporary storage tube (12) Communication; wherein, the liquid flows into the temporary storage tube (12) via the bottom end of the sampling tube (11).
The image acquisition device according to claim 4, wherein the center plane of light rays of the light source (2) coincides with the object-side focal plane of the shooting device (3).
The image acquisition device according to claim 1, wherein the photographing device (3) includes a telecentric lens (31), the depth of field of the telecentric lens (31) and the light source (2) flow in the specific flow The light range in the direction coincides.
The image acquisition device according to claim 1, wherein the image acquisition device further comprises a liquid supply container (4) in communication with the liquid measurement container (1), the liquid supply container (4) is used to The liquid measuring container (1) provides liquid with particulate matter.
The image acquisition device according to claim 7, wherein the image acquisition device further includes a pressure pump (51) communicating with the bottom end of the liquid supply container (4) and a pressure pump (51) communicating with the pressure pump (51) A liquid increasing container (5), the pressure pump (51) is used to inject the liquid in the liquid increasing container (5) into the liquid supply container (4).
The image acquisition device according to claim 1, wherein the image acquisition device further comprises: a negative pressure pump (61) and a waste liquid container (6) communicating with the bottom end of the liquid measurement container (1), so The negative pressure pump (61) communicates with the waste liquid container (6) to adjust the air pressure in the waste liquid container (6).
The image acquisition device according to claim 9, wherein the waste liquid container (6) includes a plurality of sub waste liquid containers (60), and the plurality of sub waste liquid containers (60) communicate with each other.
A detection device for particulate matter in a liquid, wherein the detection device includes an image analysis device (7) and an image acquisition device, the image acquisition device includes a liquid measurement container (1), a light source (2), and a shooting device (3) ,

The liquid measuring container (1) is used for containing liquid with particulate matter, and the liquid flows in a specific flow direction in the liquid measuring container (1);

The light source (2) is used to irradiate the liquid to cause light scattering of the particles in the liquid;

The direction of the optical axis of the photographing device (3) coincides with the specific flow direction, and the photographing device (3) is used to photograph an image of particulate matter in which light scattering occurs in the liquid,

Wherein, the image analysis device (7) is used to receive the image of the particulate matter captured by the photographing device (3), and analyze based on the image of the particulate matter.
The detection device according to claim 11, wherein the light center plane of the light source (2) coincides with the object-side focal plane of the photographing device (3).
The detection device according to claim 12, wherein the plane of the bottom end of the light beam emitted by the light source (2) coincides with the plane of the bottom end of the sampling tube (11).
The detection device according to claim 11, wherein the liquid measuring container (1) includes a temporary storage tube (12) and a sampling tube (11) provided in the temporary storage tube (12), the There is a predetermined distance between the bottom end of the sample tube (11) and the bottom end of the temporary storage tube (12), and the bottom end of the sampling tube (11) is open to communicate with the temporary storage tube (12) ; Wherein, the liquid flows into the temporary storage tube (12) via the bottom end of the sampling tube (11).
The detection device according to claim 11, wherein the photographing device (3) includes a telecentric lens (31), the depth of field of the telecentric lens (31) and the light source (2) in the specific flow direction The light ranges on the above coincide.
The detection device according to claim 11, wherein the image acquisition device further comprises a liquid supply container (4) in communication with the liquid measurement container (1), the liquid supply container (4) is used to The liquid measuring container (1) provides liquid with particulate matter.
The detection device according to claim 16, wherein the image acquisition device further comprises a pressure pump (51) in communication with the bottom end of the liquid supply container (4) and an increasing pressure in communication with the pressure pump (51) A liquid container (5), and the pressure pump (51) is used to inject the liquid in the liquid increasing container (5) into the liquid supply container (4).
The detection device according to claim 11, wherein the image acquisition device further comprises: a negative pressure pump (61) and a waste liquid container (6) communicating with the bottom end of the liquid measurement container (1), the A negative pressure pump (61) communicates with the waste liquid container (6) to adjust the air pressure in the waste liquid container (6).
The detection device according to claim 18, wherein the waste liquid container (6) includes a plurality of sub waste liquid containers (60), and the plurality of sub waste liquid containers (60) communicate with each other.