Corona detection ultraviolet imager

Abstract

The invention discloses a corona detection ultraviolet imager, which relates to the technical field of ultraviolet imaging and comprises an image processing module, a controller, a visible light image acquisition module, an ultraviolet image acquisition module, a thermal infrared image acquisition module and an image display module. The corona discharge position is determined through ultraviolet imaging, so that a discharge target related to a discharge area can be determined in a visible light image, the target range where the discharge target is located is determined, and the recognition range of a heating abnormal area in a thermal infrared image is limited to the target range; therefore, messy thermal infrared parameters, except the target range, in the finally presented three-light fusion image are effectively screened out, a user can judge the fault more quickly in combination with the abnormal heating area in the target range corresponding to the corona discharge position, and the judgment of the user on the fault is more facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of ultraviolet imaging, and in particular to a corona detection ultraviolet imager. Background Art

[0002] At present, ultraviolet imaging technology has been widely used in corona detection of power grids. Corona discharge is a localized discharge phenomenon. When the local voltage stress of the charged body exceeds the critical value, the air will be ionized and corona discharge will occur. During the discharge process, the electrons in the air continuously gain and release energy. When the electrons release energy (i.e. discharge), they emit ultraviolet rays. Ultraviolet imaging technology locates the position of corona discharge by capturing these ultraviolet rays. Ultraviolet imaging technology uses an optical system to split visible light and ultraviolet light. The background image is obtained through the visible light channel, and the ultraviolet detector detects the ultraviolet photons generated during the corona discharge process and converts them into electrical signals. These electrical signals are then processed and converted into optical images that can be seen by the human eye, and finally a visible light-ultraviolet combined image is generated on the display. This combined image can clearly show the location and intensity of the corona discharge.

[0003] Since the occurrence of corona discharge in the power grid is sometimes accompanied by heat generation, in order to obtain more fault parameters and quickly determine the cause of the fault by combining the hot spot and the corona discharge position, the three-light fusion imaging technology combining visible light imaging technology, ultraviolet imaging technology and infrared thermal imaging technology has gradually been promoted and continuously developed, such as the "real-time analysis and fusion system of ultraviolet light, infrared light and visible light three-spectrum imaging" proposed in the Chinese invention application with publication number CN115790846A.

[0004] However, since the fused image contains, in addition to the visible light image, more thermal infrared images of heating locations and more ultraviolet images of corona discharge locations, there is a lot of invalid data in the fused image, which can easily affect the user's judgment of the cause of the fault. Summary of the invention

[0005] In order to overcome the above-mentioned shortcomings, the present invention aims to provide a solution that can solve the above-mentioned technical problems.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a corona detection ultraviolet imager, comprising an image processing module, a controller, a visible light image acquisition module, an ultraviolet image acquisition module, a thermal infrared image acquisition module, and an image display module; the visible light image acquisition module is used to acquire a visible light image of an observation area, the ultraviolet image acquisition module is used to acquire an ultraviolet image of the observation area, and the thermal infrared image acquisition module is used to acquire a thermal infrared image of the observation area; the controller performs edge detection on the corona spot in the ultraviolet image through the image processing module to obtain a corona discharge area containing edge point coordinate information, and obtains an ultraviolet spot image corresponding to the corona discharge area through threshold segmentation; extracts a discharge target related to the corona discharge area in the visible light image, and performs edge detection on the discharge target to obtain a target range containing edge point coordinate information; reads thermal infrared parameters of a target range where the discharge target is located in the thermal infrared image, determines an abnormal heating area within the target range, and obtains a thermal infrared image corresponding to the abnormal heating area through threshold segmentation; fuses the visible light image, the ultraviolet spot image, and the thermal infrared image of the abnormal heating area to form a three-light fusion image; the controller outputs and displays the three-light fusion image through the image display module.

[0007] As a further solution of the present invention: when the corona discharge area and the abnormal heating area overlap, an alarm is displayed for the overlapped portion in the fused image.

[0008] As a further solution of the present invention: the alarm is displayed in a manner that makes the display brightness corresponding to the overlap in the fused image different from the brightness of the corresponding area in the visible light image, different from the brightness of the corresponding area in the ultraviolet image, and different from the brightness of the corresponding area in the thermal infrared image.

[0009] As a further solution of the present invention: the alarm is displayed in such a way that the display color corresponding to the overlap in the fused image is different from the color of the corresponding area in the visible light image, different from the color of the corresponding area in the ultraviolet image, and different from the color of the corresponding area in the thermal infrared image.

[0010] As a further solution of the present invention: temperature value information corresponding to the abnormal heating area is generated in the three-light fusion image.

[0011] As a further solution of the present invention: it also includes performing infrared distance measurement on the abnormal heating area in the thermal infrared image to generate distance value information.

[0012] As a further solution of the present invention: the distance value information is the farthest point distance of the abnormal heating area and / or the nearest point distance of the abnormal heating area and / or the distance based on the center point of the abnormal heating area.

[0013] As a further solution of the present invention: a method for determining the center point of the abnormal heating area is to perform a geometric feature analysis on the abnormal heating area to obtain the center position of the abnormal heating area.

[0014] As a further solution of the present invention: contour information of the discharge target is obtained in the visible light image, and the characteristics of the discharge target are calculated; the obtained discharge target characteristics are compared with the target characteristics in the typical power grid equipment database to determine the type of structural parts of the extracted discharge target; after determining the type of the discharge target, the size of the structural parts of this type in the typical power grid equipment database is obtained, and the simulated overall contour of the discharge target is determined based on the obtained contour information to obtain the simulated overall area of ​​the discharge target.

[0015] As a further solution of the present invention: the target range includes the visible area range of the discharge target defined by the visible contour obtained in the visible light image of the discharge target, and the simulated area range overflowing the visible area of ​​the discharge target in the simulated overall contour.

[0016] Compared with the prior art, the beneficial effects of the present technical solution are as follows: by determining the position of the corona discharge through ultraviolet imaging, the discharge target involved in the discharge area can be determined in the visible light image, as well as the target range where the discharge target is located, thereby limiting the recognition range of the abnormal heating area in the thermal infrared image to the target range, so that the messy thermal infrared parameters other than the target range in the final three-light fusion image are effectively screened out, and the user can more quickly combine the abnormal heating area from the target range corresponding to the corona discharge position to make a fault judgment, which is more conducive to the user's fault judgment.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 is a circuit block diagram of the present invention; Figure 2 It is a processing flow chart of the three-light fusion image in the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-2 A corona detection ultraviolet imager includes an image processing module 1, a controller 2, a visible light image acquisition module 3, an ultraviolet image acquisition module 4, a thermal infrared image acquisition module 5, and an image display module 6.

[0022] The visible light image acquisition module 3 is used to acquire a visible light image of the observation area, the ultraviolet image acquisition module 4 is used to acquire an ultraviolet image of the observation area, and the thermal infrared image acquisition module 5 is used to acquire a thermal infrared image of the observation area.

[0023] The controller 2 performs edge detection on the corona spot in the ultraviolet image through the image processing module 1 to obtain the corona discharge area containing the edge point coordinate information, and obtains the ultraviolet spot image corresponding to the corona discharge area through threshold segmentation; extracts the discharge target involved in the corona discharge area in the visible light image, and performs edge detection on the discharge target to obtain the target range containing the edge point coordinate information; reads the thermal infrared parameters of the target range where the discharge target is located in the thermal infrared image, determines the abnormal heating area within the target range, and obtains the thermal infrared image corresponding to the abnormal heating area through threshold segmentation; fuses the visible light image, the ultraviolet spot image, and the thermal infrared image of the abnormal heating area to form a three-light fusion image. The controller 2 outputs and displays the three-light fusion image through the image display module 6.

[0024] By determining the position of the corona discharge by ultraviolet imaging, the discharge target involved in the discharge area can be determined in the visible light image, as well as the target range where the discharge target is located, thereby limiting the recognition range of the abnormal heating area in the thermal infrared image to the target range, so that the messy thermal infrared parameters other than the target range in the final three-light fusion image are effectively screened out, and the user can more quickly judge the fault in combination with the abnormal heating area from the target range corresponding to the corona discharge position, which is more conducive to the user's judgment of the fault.

[0025] In some embodiments, the image display module may be a display device having an image display function, such as an LCD display or an OLED display.

[0026] In some embodiments, the target range where the discharge target is located can be determined by: acquiring contour information of the discharge target in a visible light image, and calculating features of the discharge target; comparing the obtained discharge target features with target features in a typical power grid equipment database, and determining the type of structural parts of the extracted discharge target; after determining the type of the discharge target, acquiring the size of the structural parts of this type in the typical power grid equipment database, and determining a simulated overall contour of the discharge target based on the obtained contour information, and obtaining a simulated overall area of ​​the discharge target.

[0027] The target range includes the visible area range of the discharge target defined by the visible contour obtained in the visible light image of the discharge target and the simulated area range overflowing the visible area of ​​the discharge target in the simulated overall contour.

[0028] Taking insulators and grading rings as examples, by simulating the overall outline, the target range can include the connection parts that are blocked by the discharge structure. When determining the abnormal heating area within the target range, the connection parts that are easily overlooked can be included and determined, which makes it easier for users to judge abnormal situations.

[0029] In some embodiments, when the corona discharge area overlaps with the abnormal heating area, an alarm is displayed for the overlap in the fused image.

[0030] In some embodiments, the alarm is displayed in such a way that the display brightness corresponding to the overlap in the fused image is different from the brightness of the corresponding area in the visible light image, different from the brightness of the corresponding area in the ultraviolet image, and different from the brightness of the corresponding area in the thermal infrared image.

[0031] In some embodiments, the alarm is displayed in such a way that the display color corresponding to the overlap in the fused image is different from the color of the corresponding area in the visible light image, different from the color of the corresponding area in the ultraviolet image, and different from the color of the corresponding area in the thermal infrared image.

[0032] In some embodiments, temperature value information corresponding to the abnormal heating area is generated in the three-light fusion image.

[0033] In some embodiments, it also includes performing infrared ranging on the abnormal heating area in the thermal infrared image to generate distance value information.

[0034] Preferably, the distance value information is the distance to the farthest point of the abnormal heating area and / or the distance to the nearest point of the abnormal heating area and / or the distance based on the center point of the abnormal heating area.

[0035] The method for determining the center point of the abnormal heating area is to perform geometric feature analysis on the abnormal heating area to obtain the center position of the abnormal heating area.

[0036] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A corona detection ultraviolet imager, characterized in that: It includes an image processing module, a controller, a visible light image acquisition module, an ultraviolet image acquisition module, a thermal infrared image acquisition module, and an image display module; The visible light image acquisition module is used to acquire a visible light image of the observation area, the ultraviolet image acquisition module is used to acquire an ultraviolet image of the observation area, and the thermal infrared image acquisition module is used to acquire a thermal infrared image of the observation area; The controller performs edge detection on the corona spot in the ultraviolet image through the image processing module to obtain the corona discharge area containing the edge point coordinate information, and obtains the ultraviolet spot image corresponding to the corona discharge area through threshold segmentation; extracts the discharge target involved in the corona discharge area in the visible light image, and performs edge detection on the discharge target to obtain the target range containing the edge point coordinate information; reads the thermal infrared parameters of the target range where the discharge target is located in the thermal infrared image, determines the abnormal heating area within the target range, and obtains the thermal infrared image corresponding to the abnormal heating area through threshold segmentation; fuses the visible light image, the ultraviolet spot image, and the thermal infrared image of the abnormal heating area to form a three-light fusion image; The controller outputs and displays the three-light fusion image through the image display module.

2. A corona detection ultraviolet imager according to claim 1, characterized in that: When the corona discharge area overlaps with the abnormal heating area, an alarm is displayed on the overlapped portion in the fused image.

3. A corona detection ultraviolet imager according to claim 2, characterized in that: The alarm is displayed in such a way that the display brightness of the overlapped portion in the fused image is different from the brightness of the corresponding area in the visible light image, the brightness of the corresponding area in the ultraviolet image, and the brightness of the corresponding area in the thermal infrared image.

4. A corona detection ultraviolet imager according to claim 2 or 3, characterized in that: The alarm is displayed in such a way that the display color corresponding to the overlap in the fused image is different from the color of the corresponding area in the visible light image, the color of the corresponding area in the ultraviolet image, and the color of the corresponding area in the thermal infrared image.

5. A corona detection ultraviolet imager according to claim 1, characterized in that: The temperature value information corresponding to the abnormal heating area is generated in the three-light fusion image.

6. A corona detection ultraviolet imager according to claim 1 or 5, characterized in that: It also includes performing infrared ranging on abnormal heating areas in thermal infrared images to generate distance value information.

7. A corona detection ultraviolet imager according to claim 6, characterized in that: The distance value information is the farthest point distance of the abnormal heating area and / or the closest point distance of the abnormal heating area and / or the distance based on the center point of the abnormal heating area.

8. A corona detection ultraviolet imager according to claim 7, characterized in that: The method for determining the center point of the abnormal heating area is to perform geometric feature analysis on the abnormal heating area to obtain the center position of the abnormal heating area.

9. A corona detection ultraviolet imager according to claim 1 or 2 or 3 or 5 or 7 or 8, characterized in that: Obtain the contour information of the discharge target in the visible light image and calculate the characteristics of the discharge target; The obtained discharge target features are compared with the target features in the typical power grid equipment database to determine the type of structural parts of the extracted discharge target. After determining the type of the discharge target, the size of this type of structural parts in the typical power grid equipment database is obtained, and the simulated overall contour of the discharge target is determined based on the obtained contour information to obtain the simulated overall area of ​​the discharge target.

10. A corona detection ultraviolet imager according to claim 9, characterized in that: The target range includes the visible area range of the discharge target defined by the visible contour obtained in the visible light image of the discharge target and the simulated area range overflowing the visible area of ​​the discharge target in the simulated overall contour.

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