A coaxial registration structure and registration method for SF6 gas remote sensing field of view

Abstract

A SF6 gas telemetry field of view coaxial registration structure and registration method, belonging to the technical field of SF6 leakage detection in confined spaces, solves the problem of how to design a SF6 gas telemetry field of view coaxial registration structure and registration method, provides support for telemetry imaging positioning of SF6 gas leakage in confined spaces and image stitching of large-scale scanning scenes, the coaxial registration structure realizes optical axis registration of a night vision camera and an infrared focal plane detector base through a field of view adjustment structure, provides hardware support for telemetry imaging positioning of SF6 gas leakage in confined spaces and image stitching of large-scale scanning scenes, the coaxial registration structure of the invention is small in size, light in weight, and low in cost, greatly improving the cost performance of SF6 gas leakage detection; the coaxial registration method provides image scaling factor calibration, coaxial adjustment registration, and pixel translation to complete field of view coaxial registration, the registration process is simple to operate, and has strong practicality.

Description

Technical Field

[0001] The present invention belongs to the confined space SF 6 The technical field of leakage detection relates to a SF 6 Gas telemetry field of view coaxial registration structure and registration method. Background Art

[0002] The confined spaces in the power industry mainly include transmission corridors, underground substations, indoor substations, etc. These confined scenes have a small footprint and strong environmental adaptability, and are widely used in areas with dense populations and buildings and complex geographical environments.

[0003] According to statistics, as of now, State Grid Corporation has more than 8,000 indoor substations and more than 50 underground substations in operation. Comprehensive pipeline corridor projects represented by Sutong GIL (Gas Insulated Line) are also emerging in various places. 6 Gas-insulated electrical equipment has the characteristics of compact structure, small size, electromagnetic environment friendly, and high safety. It is widely used in electric confined spaces. Among them, only SF6 in Sutong GIL 6 The amount of gas used is as high as more than 800 tons. 6 As the insulating and arc-extinguishing medium in the equipment, once a large amount of gas leaks, it will inevitably cause the insulation performance of the equipment to deteriorate and cause equipment operation failure; and SF 6 The greenhouse effect of gas is CO 2 It is 23,900 times more than the atmosphere, can exist in the air for more than 3,200 years, and is one of the six gases that are prohibited from being emitted under the Kyoto Protocol to the United Nations Framework Convention on Climate Change. 6 Yes, the density is 5 times that of air, and it tends to gather in low-lying areas of space. Pure SF 6 The gas is asphyxiating. After operation, the SF 6 The gas may contain highly toxic decomposition products, so if a large amount of SF 6 Gas leakage can easily cause collective casualties and bring serious social impact. Therefore, it is urgent to carry out SF 6 Gas leak detection research: Currently, the most advanced on-site detection method is a long-distance, non-contact, spectral technology represented by Fourier infrared spectroscopy telemetry. It not only uses spectral analysis to improve accuracy and detection sensitivity, but also passive telemetry is conducive to realizing large-scale autonomous inspections in the scene, which greatly meets the needs of SF in power scenes. 6 Actual requirements for gas leak detection.

[0004] Image registration technology is a basic task in the field of image processing and is also an extremely important part. 6Gas leak remote sensing imaging cannot be separated from image registration. Many image processing tasks are very dependent on image registration. Image registration is a necessary pre-processing for these image processing tasks, and the quality of its results also has a huge impact on the entire image processing. Even some image processing tasks, such as image stitching, are completely inseparable from the support of image registration. If the image is not properly registered, it will affect SF 6 Gas leak telemetry imaging positioning accuracy. In the prior art, the Chinese invention patent application with application publication number CN105929382A and application publication date September 7, 2016, "A coaxial auxiliary optical calibration device and method for transmitting and receiving of an active optoelectronic system", discloses a coaxial auxiliary optical calibration device and method for transmitting and receiving of an active optoelectronic system, which is particularly suitable for the auxiliary optical calibration process of transmitting and receiving optical systems at the same time, and is also suitable for other optical calibration fields such as calibration of normal lines of plane reflectors and auxiliary optical axis alignment. The invention is based on the self-collimation function of a corner cube prism, and uses the beam splitting function of a beam splitter to adjust the two laser beams to 180 degrees from each other. Using the characteristic that the two beams are 180 degrees from each other, one beam of light simulates the received echo and performs optical axis alignment with the receiving optical path, and the other beam of light simulates the transmitted light and performs optical axis alignment with the actual transmitted light, thereby achieving coaxial alignment of the transmitting and receiving optical paths. However, the document does not address how to design a SF 6 Gas telemetry field of view coaxial registration structure and registration method for confined space SF 6 Provides support for gas leak remote sensing imaging positioning and large-scale scanning scene image stitching. Summary of the invention

[0005] The technical problem to be solved by the present invention is how to design a SF 6 Gas telemetry field of view coaxial registration structure and registration method for confined space SF 6 Provides support for gas leak remote sensing imaging positioning and large-scale scanning scene image stitching.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] A kind of SF 6A gas telemetry field of view coaxial alignment structure comprises: a coaxial alignment bracket (1), a night vision camera (2), an infrared focal plane detector (3), an infrared focal plane detector base (4), a set screw (5), and a top screw (6); the coaxial alignment bracket (1) and the infrared focal plane detector base (4) are fixed on the same horizontal plane, the night vision camera (2) is installed inside the coaxial alignment bracket (1), a hole identical to the lens of the night vision camera (2) is opened on the front panel of the coaxial alignment bracket (1), the lens of the night vision camera (2) is installed in the hole, two set screws (5) are arranged at the upper left corner and the lower right corner of the hole, two top screws (6) are arranged at the lower left corner and the upper right corner of the hole, the two set screws (5) and the two top screws (6) are distributed at the four vertices of a square, the center of the square coincides with the center of the lens of the night vision camera (2). The two set screws (5) and the two top screws (6) are used to adjust the field of view of the night vision camera (2); the infrared focal plane detector (3) is fixed on the infrared focal plane detector base (4); the lens of the night vision camera (2) and the lens of the infrared focal plane detector (3) are arranged coaxially at the same height, and the distance between the lens of the night vision camera (2) and the lens of the infrared focal plane detector (3) is d; if the field of view of the night vision camera (2) deviates to the left, the upper left set screw (5) and the lower left top screw (6) are screwed out; if the field of view of the night vision camera (2) deviates to the right, the lower right set screw (5) and the upper right top screw (6) are screwed out; if the field of view of the night vision camera (2) deviates upward, the upper left set screw (5) and the upper right top screw (6) are screwed out; if the field of view of the night vision camera (2) deviates downward, the lower right set screw (5) and the lower left top screw (6) are screwed out.

[0008] A SF designed by the present invention 6 The gas telemetry field of view coaxial alignment structure realizes the optical axis alignment of the night vision camera and the infrared focal plane detector base through the field of view adjustment structure, which is a confined space SF 6 The coaxial registration structure of the present invention is small in size, light in weight, and low in cost, which greatly improves SF 6 Cost-effective gas leak detection.

[0009] A method for applying the SF 6 A registration method for a gas telemetry field of view coaxial registration structure comprises the following steps:

[0010] S1. Image scaling factor calibration: With the chessboard pattern target board as the background, the night vision camera (2) and the infrared focal plane detector (3) respectively obtain the chessboard image, select a chessboard grid, and calculate the total number of pixels of the two images in the grid, which are recorded as NP visible and NP infrared , calculate the infrared image scaling factor Q = NP visible / NPinfrared , after obtaining the scaling factor, scale the entire infrared image by Q;

[0011] S2, coaxial adjustment and alignment: select the sun as the infinitely far alignment target, move the entire coaxial alignment structure, first adjust the field of view center axis of the infrared focal plane detector (3) to align with the sun, then adjust the set screw (5) and the top screw (6) to align the field of view center axis of the night vision camera (2) with the sun. When the field of view center axes of the night vision camera (2) and the infrared focal plane detector (3) are both aligned with the infinitely far target, it is considered that the field of view of the night vision camera (2) and the infrared focal plane detector (3) are coaxial. Since there is a distance d between the optical axes of the night vision camera (2) and the infrared focal plane detector (3), the pixels are translated to make the target graphics on the two images overlap, and the field of view coaxial alignment is completed.

[0012] As a further improvement of the technical solution of the present invention, the method for adjusting the set screw (5) and the top screw (6) so that the central axis of the field of view of the night vision camera (2) is aligned with the sun is specifically as follows: if the field of view of the night vision camera (2) is deflected to the left, the set screw (5) at the upper left corner and the top screw (6) at the lower left corner are screwed out; if the field of view of the night vision camera (2) is deflected to the right, the set screw (5) at the lower right corner and the top screw (6) at the upper right corner are screwed out; if the field of view of the night vision camera (2) is deflected to the upper part, the set screw (5) at the upper left corner and the top screw (6) at the upper right corner are screwed out; if the field of view of the night vision camera (2) is deflected to the lower part, the set screw (5) at the lower right corner and the top screw (6) at the lower left corner are screwed out.

[0013] The advantages of the present invention are:

[0014] A SF designed by the present invention 6 The gas telemetry field of view coaxial alignment structure realizes the optical axis alignment of the night vision camera and the infrared focal plane detector base through the field of view adjustment structure, which is a confined space SF 6 The coaxial registration structure of the present invention is small in size, light in weight, and low in cost, which greatly improves SF 6 Cost-effectiveness of gas leak detection; the coaxial registration method provides image scaling factor calibration, coaxial adjustment registration, and pixel translation to complete field of view coaxial registration. The registration process is simple to operate and highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a SF of the embodiment of the present invention. 6 Front view of the coaxial registration structure of the gas telemetry field of view;

[0016] Figure 2 It is a SF of the embodiment of the present invention. 6 Front view of the coaxial registration structure of the gas telemetry field of view;

[0017] Figure 3It is a SF of the embodiment of the present invention. 6 A top view of the coaxial registration structure of the gas telemetry field of view;

[0018] Figure 4 It is a SF of the embodiment of the present invention. 6 Schematic diagram of image scaling factor calibration for gas telemetry field of view coaxial registration method;

[0019] Figure 5 It is a SF of the embodiment of the present invention. 6 Schematic diagram of the coaxial adjustment registration method for the gas telemetry field of view. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are 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] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0022] Embodiment 1

[0023] like Figure 1-3 As shown, a SF 6 The gas telemetry field of view coaxial registration structure comprises: a coaxial registration bracket 1, a night vision camera 2, an infrared focal plane detector 3, an infrared focal plane detector base 4, a set screw 5, and a top screw 6; the coaxial registration bracket 1 and the infrared focal plane detector base 4 are fixed on the same horizontal plane, the night vision camera 2 is installed inside the coaxial registration bracket 1, a hole identical to the lens of the night vision camera 2 is opened on the front panel of the coaxial registration bracket 1, the lens of the night vision camera 2 is installed in the hole, and two set screws are arranged at the upper left corner and the lower right corner of the hole 5. Two top screws 6 are arranged at the lower left corner and the upper right corner of the hole. The two set screws 5 and the two top screws 6 are distributed at the four vertices of the square. The center of the square coincides with the center of the lens of the night vision camera 2. The two set screws 5 and the two top screws 6 are used to adjust the field of view of the night vision camera 2. The infrared focal plane detector 3 is fixed on the infrared focal plane detector base 4. The lens of the night vision camera 2 and the lens of the infrared focal plane detector 3 are arranged coaxially at the same height. The distance between the lens of the night vision camera 2 and the lens of the infrared focal plane detector 3 is d.

[0024] The method of adjusting the field of view of the night vision camera 2 by tightening the set screw 5 and the top screw 6 is as follows:

[0025] 1) If the field of view of the night vision camera 2 is biased to the left, unscrew the upper left set screw 5 and the lower left top screw 6;

[0026] 2) If the field of view of the night vision camera 2 is biased to the right, unscrew the set screw 5 at the lower right corner and the top screw 6 at the upper right corner;

[0027] 3) If the field of view of the night vision camera 2 is tilted upward, unscrew the upper left set screw 5 and the upper right top screw 6;

[0028] 4) If the field of view of the night vision camera 2 is tilted downward, unscrew the set screw 5 at the lower right corner and the top screw 6 at the lower left corner.

[0029] The SF 6 The registration method of the coaxial registration structure of the gas telemetry field of view is as follows:

[0030] a. Image scaling factor calibration

[0031] Since the single pixel field of view of the night vision camera 2 and the infrared focal plane detector 3 are different, the image scaling factors of the two need to be calibrated before field of view registration so that the size of the same target in the image remains consistent. Figure 4 As shown in the figure, with the chessboard pattern target board as the background, the night vision camera 2 and the infrared focal plane detector 3 respectively obtain the chessboard image, select a chessboard grid, and calculate the total number of pixels of the two images in the grid, which are recorded as NP visible and NP infrared , calculate the infrared image scaling factor Q = NP visible / NP infrared , after obtaining the scaling factor, scale the entire infrared image by Q.

[0032] b. Coaxial adjustment and registration

[0033] like Figure 5 As shown, the sun is selected as the infinitely far target, and the entire coaxial registration structure is moved. First, the field of view center axis of the infrared focal plane detector 3 is adjusted to align with the sun, and then the set screw 5 and the top screw 6 are adjusted to align the field of view center axis of the night vision camera 2 with the sun. When the field of view center axes of the night vision camera 2 and the infrared focal plane detector 3 are both aligned with the infinitely far target, it is considered that the field of view of the night vision camera 2 and the infrared focal plane detector 3 are coaxial. Since there is a distance d between the optical axes of the night vision camera 2 and the infrared focal plane detector 3, it is necessary to translate the pixels to make the target graphics on the two images coincide, and the field of view coaxial registration is completed.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A SF6 gas telemetry field of view coaxial registration structure, characterized in that: include: A coaxial registration bracket (1), a night vision camera (2), an infrared focal plane detector (3), an infrared focal plane detector base (4), a set screw (5), and a top screw (6); the coaxial registration bracket (1) and the infrared focal plane detector base (4) are fixed on the same horizontal plane, the night vision camera (2) is installed inside the coaxial registration bracket (1), a hole identical to the lens of the night vision camera (2) is opened on the front panel of the coaxial registration bracket (1), the lens of the night vision camera (2) is installed in the hole, two set screws (5) are arranged at the upper left corner and the lower right corner of the hole, two top screws (6) are arranged at the lower left corner and the upper right corner of the hole, the two set screws (5) and the two top screws (6) are distributed at the four vertices of a square, the center of the square coincides with the center of the lens of the night vision camera (2), the two set screws (5) and two top screws (6) are used to adjust the field of view of the night vision camera (2); the infrared focal plane detector (3) is fixed on the infrared focal plane detector base (4); the lens of the night vision camera (2) and the lens of the infrared focal plane detector (3) are coaxially arranged at the same height, and the distance between the lens of the night vision camera (2) and the lens of the infrared focal plane detector (3) is d; if the field of view of the night vision camera (2) deviates to the left, the upper left set screw (5) and the lower left top screw (6) are screwed out; if the field of view of the night vision camera (2) deviates to the right, the lower right set screw (5) and the upper right top screw (6) are screwed out; if the field of view of the night vision camera (2) deviates upward, the upper left set screw (5) and the upper right top screw (6) are screwed out; if the field of view of the night vision camera (2) deviates downward, the lower right set screw (5) and the lower left top screw (6) are screwed out.

2. A registration method for the SF6 gas telemetry field of view coaxial registration structure according to claim 1, characterized in that: The following steps are involved: S1. Image scaling factor calibration: With the chessboard pattern target board as the background, the night vision camera (2) and the infrared focal plane detector (3) respectively obtain the chessboard image, select a chessboard grid, and calculate the total number of pixels of the two images in the grid, which are recorded as NP visible and NP infrared , calculate the infrared image scaling factor Q = NP visible / NP infrared , after obtaining the scaling factor, scale the entire infrared image by Q; S2, coaxial adjustment and alignment: select the sun as the infinitely far alignment target, move the entire coaxial alignment structure, first adjust the field of view center axis of the infrared focal plane detector (3) to align with the sun, then adjust the set screw (5) and the top screw (6) to align the field of view center axis of the night vision camera (2) with the sun. When the field of view center axes of the night vision camera (2) and the infrared focal plane detector (3) are both aligned with the infinitely far target, it is considered that the field of view of the night vision camera (2) and the infrared focal plane detector (3) are coaxial. Since there is a distance d between the optical axes of the night vision camera (2) and the infrared focal plane detector (3), the pixels are translated to make the target graphics on the two images overlap, and the field of view coaxial alignment is completed.

3. The registration method according to claim 2, characterized in that: The method for adjusting the set screw (5) and the top screw (6) so that the central axis of the field of view of the night vision camera (2) is aligned with the sun is specifically as follows: if the field of view of the night vision camera (2) deviates to the left, the set screw (5) at the upper left corner and the top screw (6) at the lower left corner are screwed out; if the field of view of the night vision camera (2) deviates to the right, the set screw (5) at the lower right corner and the top screw (6) at the upper right corner are screwed out; if the field of view of the night vision camera (2) deviates to the upper part, the set screw (5) at the upper left corner and the top screw (6) at the upper right corner are screwed out; if the field of view of the night vision camera (2) deviates to the lower part, the set screw (5) at the lower right corner and the top screw (6) at the lower left corner are screwed out.

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