CN110763600A - Real-time online detection device for suspended particles - Google Patents
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- G01N15/02—Investigating particle size or size distribution
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Abstract
The invention provides a real-time online detection device for suspended particles, which comprises: a light source; the light source shaping component is used for adjusting light beams emitted by the light source to output linear parallel light, and the linear parallel light is used for illuminating an area to be detected; an optical trap for collecting linear parallel light to prevent light reflection; the camera comprises a detector, the lens is used for imaging an image of the area to be detected on the detector of the camera, and the camera is used for converting an optical signal of the image of the area to be detected into an electric signal; and the image acquisition and processing unit is connected with the camera and is used for calculating and acquiring the size and the number of the suspended particles according to the electric signals of the image of the area to be detected. By applying the technical scheme of the invention, the technical problem that the detection device in the prior art is difficult to detect suspended matters in the designated space in real time is solved.
Description
Technical Field
The invention relates to the technical field of optical system design and intelligent identification, in particular to a suspended particle real-time online detection device.
Background
In the production and assembly process of precision equipment, certain cleanliness is required to be achieved by the environment, and the names of ten thousands, hundreds and the like can quantitatively describe the space cleanliness and represent the number of suspended particles in a unit three-dimensional space. Although some devices are used for measuring the particle number of suspended matters in air, most devices adopt a sample measurement method, namely, gas sampling is carried out firstly and then measurement is carried out, and the current methods are feasible for sampling and checking the cleanliness in a closed space, but have certain limitation on real-time detection of suspended matters in an open designated space position.
At present, some enterprises develop a method for measuring suspended particles in air by using an optical detection technology, but the detection process still depends on air sampling, suspended particles are detected through a sample box or a sample circulation area, the sampling is difficult to accurately reflect the density of the suspended particles in a specified space in real time, and when the number of suspended particles in a static space needs to be detected in real time, the current detection method is difficult to meet the requirement. In addition, in some special areas, there is not enough space for placing the existing measuring equipment, so that the measurement of suspended matters in a narrow space cannot be directly measured by the existing equipment. In addition, for the production assembly environment of large-scale equipment, especially for the equipment assembly containing tiny liquid pipelines and gas pipelines, the influence of tiny particles in the local range of the inlet and the outlet of the pipeline needs to be particularly noticed, and the existing equipment is difficult to meet the requirements aiming at the measurement requirements.
Disclosure of Invention
The invention provides a real-time online detection device for suspended particles, which can solve the technical problem that the detection device in the prior art is difficult to detect suspended matters in a specified space in real time.
The invention provides a real-time online detection device for suspended particles, which comprises: a light source; the light source shaping component is used for adjusting light beams emitted by the light source to output linear parallel light, and the linear parallel light is used for illuminating an area to be detected; an optical trap for collecting linear parallel light to prevent light reflection; the camera comprises a detector, the lens is used for imaging an image of the area to be detected on the detector of the camera, and the camera is used for converting an optical signal of the image of the area to be detected into an electric signal; and the image acquisition and processing unit is connected with the camera and is used for calculating and acquiring the size and the number of the suspended particles according to the electric signals of the image of the area to be detected.
Further, the light source comprises a laser or a light emitting diode, and the suspended particle real-time online detection device can adjust the brightness of the light source according to the dynamic range of the camera to ensure that the gray value of an image formed by the suspended particles in the region to be detected in the camera is the median of the pixel saturation gray value.
Furthermore, the light source is a laser, the light source shaping assembly comprises a beam expanding lens and a slit diaphragm, the beam expanding lens is used for expanding the laser emitted by the laser, and the expanded laser forms linear parallel light with set length and width after passing through the slit diaphragm.
Furthermore, the light source is a light emitting diode, the light source shaping assembly comprises a cylindrical lens and a slit diaphragm, the light emitting diode is located on a focal plane of the cylindrical lens, light beams emitted by the light emitting diode form parallel light after passing through the cylindrical lens, and the parallel light forms linear parallel light with set length and width after passing through the slit diaphragm.
Further, the ratio of the light source length of the linear parallel light to the imaging length on the detector of the camera is equal to the magnification of the lens, and the light source width of the linear parallel light is equal to the depth of field of the camera.
Further, the light trap is arranged in parallel with the light source and the light source shaping assembly respectively, the center of the light trap is opposite to the center of the light source, the light trap comprises a metal matrix and black paint, the metal matrix is provided with a black cavity, the black paint is coated on the surface of the black cavity, and the emissivity of the black paint is larger than 0.95.
Further, the cross section of the blackbody cavity comprises a rectangle, the bottom of the blackbody cavity is in an inverted cone structure, and the tip of the inverted cone structure faces the direction of the light source.
Further, the length of the black body cavity is greater than 10% of the light source length of the linear parallel light, the width of the black body cavity is greater than 10% of the light source width of the linear parallel light, and the depth of the black body cavity is greater than six times the width of the black body cavity.
Further, the ratio of the distance between the light trap and the light source to the light source length of the linear parallel light is equal to the ratio of the length to the width of the detector of the camera.
Furthermore, the real-time online detection device also comprises a base, and the light source, the light source shaping assembly, the light trap, the lens and the camera are all arranged on the base.
The device adjusts light emitted by a light source into linear parallel light through a light source shaping component to illuminate an area to be detected, images of the area to be detected are imaged on a detector of a camera through a lens, optical signals of the images of the area to be detected are converted into electric signals through the camera, and finally the size and the number of the suspended particles in any area to be detected can be obtained in real time through image information calculation of the area to be detected through an image acquisition processing unit. Compared with the prior art, the real-time online detection device is simple in structure, can perform online real-time detection on suspended particles in an area to be detected by adjusting the position of the camera lens and the position of the light source irradiation area according to the area to be detected to obtain the size and the number of the suspended particles, and realizes air quality detection of a working area under a special working environment condition.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a block diagram illustrating a real-time online detection apparatus for suspended particles according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a real-time online detection device for suspended particles according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating dimensions of line-shaped parallel light provided in accordance with a specific embodiment of the present invention;
FIG. 4 illustrates a schematic structural diagram of an optical trap provided in accordance with a specific embodiment of the present invention;
FIG. 5 shows a front view of the optical trap provided in FIG. 4;
FIG. 6 shows a cross-sectional view of the optical trap provided in FIG. 4;
FIG. 7 is a schematic structural diagram of a real-time online detection device for suspended particles according to another embodiment of the present invention;
fig. 8 is a graph showing the result of the suspended particle detection performed by the suspended particle real-time on-line detection apparatus according to the present invention.
Wherein the figures include the following reference numerals:
10. a light source; 20. a light source shaping component; 30. a light trap; 30a, black body cavity; 40. a lens; 50. a camera; 60. and the image acquisition processing unit.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
As shown in fig. 1 to 7, according to an embodiment of the present invention, there is provided a real-time on-line detection apparatus for suspended particles, the device for real-time online detection of suspended particles comprises a light source 10, a light source shaping component 20, a light trap 30, a lens 40, a camera 50 and an image acquisition and processing unit 60, wherein the light source shaping component 20 is used for adjusting light beams emitted by the light source 10 to output linear parallel light, the linear parallel light is used for illuminating an area to be detected, the light trap 30 is used for collecting the linear parallel light to prevent light reflection, the lens 40 is arranged on the camera 50, the camera 50 comprises a detector, the lens 40 is used for imaging an image of the area to be detected on the detector of the camera 50, the camera 50 is used for converting optical signals of the image of the area to be detected into electric signals, the image acquisition processing unit 60 is connected to the camera 50, and the image acquisition processing unit 60 is configured to calculate and acquire the size and number of the suspended particles according to the electrical signal of the image of the region to be detected.
By applying the configuration mode, the device can adjust light emitted by the light source into linear parallel light through the light source shaping assembly to illuminate the area to be detected, the lens images the image of the area to be detected on the detector of the camera, the camera converts an optical signal of the image of the area to be detected into an electric signal, and finally the image acquisition processing unit calculates the electric signal of the image of the area to be detected to obtain the size and the number of the suspended particles in any area to be detected in real time. Compared with the prior art, the real-time online detection device is simple in structure, can perform online real-time detection on suspended particles in an area to be detected by adjusting the position of the camera lens and the position of the light source irradiation area according to the area to be detected to obtain the size and the number of the suspended particles, and realizes air quality detection of a working area under a special working environment condition.
In addition, the real-time online detection device can be scaled in the same proportion according to the space size of the real-time region to be detected, so that the device is suitable for air quality detection of various working regions with different sizes. For some tiny working areas in the prior art, as long as the fact that shielding between the area to be detected of the on-line detection device and a camera is avoided can be guaranteed, the area to be detected can be illuminated through a light source, the size and the number of suspended particles in the area to be detected can be captured in real time in an image sensing mode, air quality detection of the tiny working areas under special working environment conditions is achieved, the problem that tiny suspended particles in air cannot be detected in real time on site in the process of assembling of tiny liquid pipelines and gas pipelines in the production and assembly environment of large-scale equipment is solved, and effective guarantee is provided for assembling of precise equipment.
Further, in the present invention, in order to illuminate the area to be detected and improve the imaging quality, the light source 10 may be configured to include a laser or a light emitting diode, and the suspended particle real-time online detection apparatus may adjust the brightness of the light source 10 according to the dynamic range of the camera 50 to ensure that the gray value of the image of the suspended particles in the area to be detected imaged in the camera 50 is the median of the pixel saturation gray value. Other high brightness light sources may be used as the light source 10 in other embodiments of the present invention.
In the present invention, when the field environment is a dark environment, the brightness of the laser light may be adjusted to a small value, and when the field environment is a bright environment, the brightness of the laser light should be adjusted to a large value. In particular, the brightness of the light source 10 may be adjusted manually or automatically. When the brightness of the light source is manually adjusted, the gray value of the image imaged by the suspended particle in the camera is observed, and when the deviation between the gray value of the image imaged by the suspended particle in the camera and the median of the pixel saturation gray value is too large, the brightness of the light source is manually adjusted, so that the gray value of the image imaged by the suspended particle in the camera 50 is the median of the pixel saturation gray value.
When the brightness of the light source is adjusted in an automatic manner, the image acquisition processing unit 60 may acquire the gray value of the image formed by the suspended particles in the camera in real time, and compare the gray value of the image with the median of the saturated gray value of the pixel, and when the deviation value between the gray value of the image formed by the suspended particles in the camera and the median of the saturated gray value of the pixel exceeds the set threshold, the image acquisition processing unit 60 may control the controller of the light source 10 to modulate the brightness of the light source 10, so that the gray value of the image formed by the suspended particles in the camera is approximately equal to the median of the saturated gray value of the pixel, thereby improving the operation efficiency.
Further, as an embodiment of the present invention, when a laser is used as the light source 10, the light source shaping component 20 includes a beam expander and a slit diaphragm, because light emitted by the laser is parallel light, the beam expander is required to expand laser light emitted by the laser, and the expanded laser light passes through the slit diaphragm to form linear parallel light with a set length and width. Specifically, in this embodiment, the brightness adjustment principle of the laser may be determined such that when the laser output by the laser can illuminate the suspended particle with a diameter of 10 μm and the scattered light of the particle makes the detector of the camera detect the particle apparently, the brightness of the laser is the appropriate brightness. In addition, in the present invention, the power supply method of the light source 10 is not limited, and any one of the power supply methods in the related art, for example, a 220V ac power supply or a dc power supply, etc., may be used.
As another embodiment of the present invention, when a light emitting diode is used as the light source 10, the light source shaping component 20 includes a cylindrical lens and a slit diaphragm, and since the light emitted by the light emitting diode is visible light, in order to realize effective illumination of the region to be detected, the visible light needs to be converted into parallel light. The light emitting diode is arranged on the focal plane of the cylindrical lens, light beams emitted by the light emitting diode form parallel light after passing through the cylindrical lens, and the parallel light forms linear parallel light with set length and width after passing through the slit diaphragm. Specifically, in this embodiment, the brightness adjustment principle of the light emitting diode may be determined that when the laser output by the laser can illuminate the suspended particle with a diameter of 10 μm and the scattered light of the particle makes the detector of the camera detect the particle obviously, the brightness of the light emitting diode is the appropriate brightness. Further, in the present invention, the power supply method of the light source 10 is not limited, and any one of the power supply methods in the related art, such as a regulated dc power supply, etc., may be used.
Further, in the present invention, the light beam emitted from the light source 10 is shaped into the linear parallel light after passing through the light source shaping component 20, and in order to ensure effective shooting and clear imaging in the detector of the camera, as shown in fig. 3, the ratio of the light source length L1 of the linear parallel light to the imaging length on the detector of the camera 50 may be configured to be equal to the magnification of the lens 40, and the light source width W1 of the linear parallel light is equal to the depth of field of the camera 50.
With this arrangement, by configuring the ratio of the light source length L1 of the linear parallel light to the imaging length on the detector of the camera 50 to be equal to the magnification of the lens 40, that is, the light source length L1 of the linear parallel light corresponds to the length of the detector of the camera with respect to the lens 40, that is, the length of the light source length L1 of the linear parallel light imaged on the detector of the camera after passing through the lens 40 is equal to the length of the detector, it is possible to avoid shooting other objects into the image due to the light source length L1 of the linear parallel light being too large so that image processing fails and shooting is not performed completely due to the light source length L1 of the linear parallel light being too small so that the area to be detected is not shot completely. In addition, by setting the light source width W1 of the linear parallel light to be equal to the depth of field of the camera 50, the floating particulate matter within the thickness range of the illuminated area can be captured by the camera, and the illuminated object can be imaged clearly, improving the calculation accuracy of the floating particulate matter. As a specific embodiment of the present invention, the width of the slit diaphragm is 5 mm. The length is 30 mm.
Further, in the present invention, in order to effectively avoid light reflection and improve imaging definition, the light trap 30 may be configured to be disposed in parallel with the light source 10 and the light source shaping component 20, respectively, and a center of the light trap 30 is disposed opposite to a center of the light source 10, the light trap 30 includes a metal matrix and a black paint, the metal matrix has a black cavity 30a, the black paint is coated on a surface of the black cavity 30a, and an emissivity of the black paint is greater than 0.95. By applying the configuration mode, the light trap 30 is arranged right opposite to the light source 10, so that all output light of the light source 10 is incident into the light trap, and the influence of light beam reflection on imaging quality is prevented.
As an embodiment of the present invention, as shown in fig. 4 to 6, the cross-sectional shape of the black body cavity 30a includes a rectangle, the bottom of the black body cavity 30a has an inverse tapered structure, and the tip of the inverse tapered structure is disposed toward the light source 10. By applying the configuration mode, the bottom of the blackbody cavity 30a is set to be of the inverted cone-shaped structure, so that light beams entering the blackbody cavity can be effectively absorbed, and the light beam absorption efficiency is improved.
Further, in the present invention, in order to further improve the light beam absorption efficiency, the length L2 of the blackbody cavity 30a may be configured to be greater than 10% of the light source length L1 of the linear parallel light, the width W2 of the blackbody cavity 30a may be greater than 10% of the light source width W2 of the linear parallel light, and the depth H2 of the blackbody cavity 30a may be greater than six times the width W2 of the blackbody cavity 30 a. With this configuration, by setting both the length L2 and the width W2 of the blackbody cavity 30a to be larger than the length L1 and the width W1 of the linear parallel light, diffraction of the light beam during traveling can be effectively prevented to achieve effective absorption of the light beam. Wherein, in the present invention, the depth H2 of the optical trap 30 is not less than 10 mm.
Further, in the present invention, in order to ensure that imaging is effective, the ratio of the distance H1 between the optical trap 30 and the light source 10 to the light source length L1 of the linear parallel light may be set equal to the ratio of the length to the width of the detector of the camera 50. By adopting the configuration mode, the situation that the shot of the detected area is not complete or other objects are included due to the unreasonable setting of the ratio of the distance H1 between the light trap 30 and the light source 10 to the light source length L1 of the linear parallel light can be effectively avoided, and the accuracy of the calculation result is reduced. As an embodiment of the present invention, the optical trap 30 has a width W2 of 5.5mm, a length L2 of 31mm, and a depth H2 of 35 mm. The distance H1 from the light trap 30 to the light source 10 was chosen to be 40 mm.
Further, in the present invention, in order to improve the portability of the inspection apparatus, as shown in fig. 7, the real-time on-line inspection apparatus may be configured to further include a base 70, and the light source 10, the light source shaping assembly 20, the light trap 30, the lens 40, and the camera 50 are all disposed on the base 70. By applying the configuration mode, the light source shaping component 20 is mechanically connected with the light source 10, the light trap 30 and the light source 10 are connected with an instrument through the base 70 so as to be uniformly adjusted, when the air quality in a narrow space needs to be detected, the base 70 can be reduced in the same proportion according to actual needs, and the condition that no shielding exists between the area to be detected and a camera can be ensured.
In addition, in the present invention, the lens 40 is an imaging system, the lens 40 is matched with the camera 50, and the spatial resolution of the lens 40 is greater than that of the camera 50. The focal length of the lens 40 is typically, but not limited to, a variable focal length. The depth of field of the lens 40 corresponds to the width W1 of the light source 10, and the depth of field of the lens 40 is slightly larger than or equal to the width W1 of the light source 10, so as to ensure that the space illuminated by the light source can be clearly imaged on the detector of the camera 50, and the mechanical interface of the lens 10 is consistent with the mechanical interface of the camera 50. In the present invention, the field angle FOV of the lens 40 may be calculated according to a formula FOV ═ 2 × arctan (d/2L), where d is a diagonal length of the area to be detected, and L is a distance from the detector of the camera 50 to the area to be detected.
Further, in the present invention, the camera 50 is a digital camera, the detector of the camera 50 is a high-resolution area vibration detector, the number of detector pixels of the camera 50 is not less than 1024 × 768, the frame rate of the camera is not less than 30fps, and the distance from the camera detector to the area to be detected can be determined according to the requirement of the work site. The aspect ratio of the detector of the camera is 4:3, and the detector can clearly distinguish the object with the specified size on the detected plane. As an embodiment of the present invention, the detector type of the camera 50 is CMOS, the pixel resolution of the detector is 4096 × 3072, and the frame rate of the camera is 30 fps.
In addition, as an embodiment of the present invention, the lens 40 may select a fixed focal length, the focal length of the lens 40 is 10mm, the working distance is 100mm, and the mechanical interface of the lens 40 is a C-port. The working distance of the lens 40 is adjustable and the F-number of the lens 40 is adjustable. Optionally, as another embodiment of the present invention, the lens 40 selects an adjustable focal length, the working distance is 100mm, and the mechanical interface of the lens 40 is a C-port. The working distance of the lens 40 is adjustable and the F-number of the lens 40 is adjustable.
Further, in the present invention, after the image of the region to be detected is acquired, the number and size of the suspended particles need to be calculated. The present invention adopts a computer and application software as the image acquisition processing unit 60, and the computer and the application software are a computer with functions of data receiving, data calculating, data outputting and data storing. The controller realizes real-time data acquisition and processing of the camera 50 under the action of application software. The data acquisition rate of the controller is greater than the data output rate of the camera 50. The application software on the controller processes data, the processing process is an image identification and processing process, the image identification process is carried out according to a matching algorithm, firstly, statistical processing is carried out through an image histogram, an image segmentation threshold value is searched, then, a characteristic boundary in the image is extracted by adopting the threshold value, and finally, the area of a characteristic region is calculated to obtain the size and the number of suspended particles.
In the present invention, the product of the length L1, the width W1, and the depth H1 of the distance camera 50 of the region to be detected represents the volume of the region to be detected, and the number of suspended particles per unit volume can be obtained by comparing the total number of suspended particles with the volume of the region to be detected after the total number of suspended particles is obtained by the image acquisition processing unit 60.
Specifically, as an embodiment of the present invention, the computer in the computer and the application software is a general computer, the processor of the computer has a main frequency not less than 3GHz, the application software in the computer and the application software is a dedicated image processing software, and the key content of the image processing software is an image processing algorithm, whose main function is to capture image data and calculate the position and size of the illuminated scattering unit in the image. Fig. 8 shows the results of online detection of suspended particles using the apparatus for real-time online detection of suspended particles of the present invention, in which circles represent spherical suspended matter and thin lines represent linear suspended matter.
In summary, compared with the prior art, the device for real-time online detection of suspended particles provided by the invention can capture the size and the number of the suspended particles in a detected area in real time in an image sensing mode, realize air quality detection of a tiny working area under a special working environment condition, solve the problem that the tiny suspended particles in air cannot be detected in real time on site in the equipment assembly of tiny liquid pipelines and gas pipelines in the production and assembly environment of large-scale equipment, and provide effective guarantee for precision equipment assembly.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The real-time online detection device for suspended particles is characterized by comprising:
a light source (10);
the light source shaping component (20), the light source shaping component (20) is used for adjusting the light beam emitted by the light source (10) to output linear parallel light, and the linear parallel light is used for illuminating an area to be detected;
an optical trap (30), the optical trap (30) being configured to collect the line-shaped parallel light to prevent light reflection;
the device comprises a lens (40) and a camera (50), wherein the lens (40) is arranged on the camera (50), the camera (50) comprises a detector, the lens (40) is used for imaging an image of a region to be detected on the detector of the camera (50), and the camera (50) is used for converting an optical signal of the image of the region to be detected into an electric signal;
the image acquisition and processing unit (60) is connected with the camera (50), and the image acquisition and processing unit (60) is used for calculating and acquiring the size and the number of the suspended particles according to the electric signals of the image of the area to be detected.
2. The device for real-time online detection of suspended particles according to claim 1, wherein the light source (10) comprises a laser or a light emitting diode, and the device for real-time online detection of suspended particles can adjust the brightness of the light source (10) according to the dynamic range of the camera (50) to ensure that the gray value of the image of the suspended particles in the region to be detected in the camera (50) is the median of the pixel saturation gray value.
3. The device for real-time online detection of suspended particles according to claim 2, wherein the light source (10) is a laser, the light source shaping component (20) includes a beam expander and a slit diaphragm, the beam expander is configured to expand laser light emitted by the laser, and the expanded laser light passes through the slit diaphragm to form linear parallel light with a set length and width.
4. The device for real-time online detection of suspended particles according to claim 2, wherein the light source (10) is a light emitting diode, the light source shaping component (20) comprises a cylindrical lens and a slit diaphragm, the light emitting diode is located on a focal plane of the cylindrical lens, a light beam emitted by the light emitting diode forms parallel light after passing through the cylindrical lens, and the parallel light forms linear parallel light with a set length and width after passing through the slit diaphragm.
5. The device for real-time online detection of suspended particles according to any one of claims 1 to 4, wherein the ratio of the light source length of the linear parallel light to the imaging length on the detector of the camera (50) is equal to the magnification of the lens (40), and the light source width of the linear parallel light is equal to the depth of field of the camera (50).
6. The device for real-time online detection of suspended particles according to claim 1, wherein the light trap (30) is respectively arranged in parallel with the light source (10) and the light source shaping component (20) and the center of the light trap (30) is arranged opposite to the center of the light source (10), the light trap (30) comprises a metal matrix and a black paint, the metal matrix is provided with a black cavity (30a), the black paint is coated on the surface of the black cavity (30a), and the emissivity of the black paint is greater than 0.95.
7. The device for real-time online detection of suspended particles according to claim 6, wherein the cross-sectional shape of the black body cavity (30a) comprises a rectangle, the bottom of the black body cavity (30a) is in an inverted cone structure, and the tip of the inverted cone structure is arranged towards the light source (10).
8. The device for real-time online detection of suspended particles according to claim 6, wherein the length of the black body cavity (30a) is greater than 10% of the light source length of the linear parallel light, the width of the black body cavity (30a) is greater than 10% of the light source width of the linear parallel light, and the depth of the black body cavity (30a) is greater than six times the width of the black body cavity (30 a).
9. The device for real-time online detection of suspended particles according to any of claims 1 to 4, characterized in that the ratio of the distance between the optical trap (30) and the light source (10) to the light source length of the linear parallel light is equal to the ratio of the length to the width of the detector of the camera (50).
10. The device for real-time online detection of suspended particles according to any one of claims 1 to 4, further comprising a base (70), wherein the light source (10), the light source shaping component (20), the light trap (30), the lens (40) and the camera (50) are all disposed on the base (70).
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| CN201810839203.8A CN110763600A (en) | 2018-07-27 | 2018-07-27 | Real-time online detection device for suspended particles |
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| CN201810839203.8A CN110763600A (en) | 2018-07-27 | 2018-07-27 | Real-time online detection device for suspended particles |
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