CN111157478A - Spectrum type infrared imaging monitoring device and method for SF6 gas leakage - Google Patents
Spectrum type infrared imaging monitoring device and method for SF6 gas leakage Download PDFInfo
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Abstract
The invention discloses a light-splitting infrared imaging monitoring device for SF6 gas leakage, which comprises: the infrared image processing device comprises an infrared lens, an infrared light splitting element, an infrared band elimination filter, a first infrared focal plane detector, a second infrared focal plane detector, an infrared image processing module and a display module; the infrared lens receives scene infrared radiation and outputs the scene infrared radiation to the infrared light splitting element, the infrared light splitting element outputs a first path of infrared radiation and a second path of infrared radiation, the first path of infrared radiation is output to a first infrared focal plane detector through the infrared band elimination filter, the second path of infrared radiation is output to a second infrared focal plane detector, and output ends of the first infrared focal plane detector and the second infrared focal plane detector are connected to the infrared image processing module; the center wavelength of the infrared band elimination filter is 10.5-10.6 μm. The invention also discloses a light-splitting infrared imaging monitoring method for SF6 gas leakage. The invention has high sensitivity for monitoring SF6 gas leakage and can quickly and accurately position the leakage position.
Description
Technical Field
The invention relates to the technical field of monitoring in the power industry, in particular to a light-splitting infrared imaging monitoring device and method for SF6 gas leakage.
Background
In high-voltage equipment in the power industry, SF6 gas is widely used because of its good chemical stability, thermal stability, insulation and arc extinguishing properties. The insulating medium is the first choice for equipment such as circuit breakers, high-voltage switches, high-voltage transformers, high-voltage transmission lines, high-power transformers and the like. Leakage of SF6 gas in high voltage equipment is a common phenomenon due to factors such as the manufacturing process, installation method, and equipment aging of the power equipment. The SF6 gas leakage can cause the internal pressure of the equipment to drop, resulting in the reduction of insulation and arc extinguishing performance, and can bring serious threats to the safe operation of power equipment and the life health of indoor workers. Therefore, the SF6 gas leakage monitoring technology has important significance for preventing SF6 gas leakage and timely early warning in the power equipment operation area.
The current common methods for monitoring SF6 gas leakage points on site mainly comprise ultraviolet ionization type monitoring, ultrasonic monitoring, laser imaging monitoring and infrared imaging monitoring technologies. The ultraviolet ionization type monitoring technology can be used for positioning which sealing surface is leaked; the ultrasonic monitoring technology realizes the remote detection of the leakage point of the live equipment; the laser monitoring technology detects by setting a background as a reflecting surface. The SF6 infrared imaging monitoring technology can realize noncontact type large-range monitoring and quick positioning of leakage points.
In the field monitoring technology, the ultraviolet ionization type monitoring technology has poor positioning performance, and can only determine which sealing surface leaks but cannot accurately find a leak point; the ultrasonic monitoring technology cannot detect the leakage point of the charged equipment in a short distance, so that the detection and positioning are not accurate; the laser monitoring technology needs a certain background as a reflecting surface, and the monitor has large volume, heavy mass and monitoring dead angles, so that the application and popularization of the monitor form certain limitations; the SF6 infrared imaging monitoring technology can realize non-contact and large-range monitoring, and is realized by adding a narrow-band filter matched with the infrared spectrum of SF6 gas in an infrared optical system of a single infrared camera. The technical scheme adopting the narrow-band filter can lead the infrared radiation to be seriously weakened and reduce the signal to noise ratio of the monitoring device, thereby reducing the sensitivity of the SF6 gas imaging monitoring device and leading the leakage position to be difficult to locate.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a light-splitting infrared imaging monitoring device and a light-splitting infrared imaging monitoring method for SF6 gas leakage, according to the strong absorption characteristic of SF6 gas at the infrared wavelength near 10.55 mu m, an infrared light-splitting element is utilized to split scene infrared radiation into two paths of transmission infrared radiation and reflection infrared radiation, and difference processing is carried out on the two paths of infrared images to detect SF6 gas leakage, so that the sensitivity of monitoring SF6 gas leakage is improved, and the leakage position is quickly and accurately positioned.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
towards infrared imaging monitoring devices of beam split type of SF6 gas leakage, include:
the infrared image processing device comprises an infrared lens, an infrared light splitting element, an infrared band elimination filter, a first infrared focal plane detector, a second infrared focal plane detector, an infrared image processing module and a display module;
the infrared lens receives scene infrared radiation and outputs the scene infrared radiation to the infrared light splitting element, the infrared light splitting element outputs a first path of infrared radiation and a second path of infrared radiation, the first path of infrared radiation is output to a first infrared focal plane detector through the infrared band elimination filter, the second path of infrared radiation is output to a second infrared focal plane detector, and output ends of the first infrared focal plane detector and the second infrared focal plane detector are connected to the infrared image processing module; the output end of the infrared image processing module is connected with the display module; the center wavelength of the infrared band elimination filter is 10.5-10.6 mu m.
As a preferred embodiment of the present invention: the first path of infrared image is transmission infrared radiation of the infrared light splitting element, and the second path of infrared image is reflection infrared radiation of the infrared light splitting element.
As a preferred embodiment of the present invention: the first path of infrared image is the reflected infrared radiation of the infrared light splitting element, and the second path of infrared image is the transmitted infrared radiation of the infrared light splitting element.
Preferably: the central wavelength of the infrared band elimination filter is 10.55 mu m.
As a preferred embodiment of the present invention: the infrared light splitting element is any one of an infrared light splitting sheet, an infrared beam splitter and an infrared light splitting prism.
As a preferred embodiment of the present invention: the first infrared focal plane detector and the second infrared focal plane detector adopt any one of a non-refrigeration type long-wave infrared focal plane detector, a non-refrigeration type broad spectrum infrared focal plane detector and a refrigeration type broad spectrum infrared focal plane detector.
A spectral infrared imaging monitoring method for SF6 gas leakage comprises the following steps:
the infrared lens receives scene infrared radiation and transmits the scene infrared radiation to the infrared light splitting element;
the infrared light splitting element divides the infrared radiation into two paths of transmission infrared radiation and reflection infrared radiation, wherein the first path is transmitted to a first infrared focal plane detector through an infrared band elimination filter, and the second path is transmitted to a second infrared focal plane detector;
the first infrared focal plane detector and the second infrared focal plane detector respectively acquire a first path of infrared image and a second path of infrared image and transmit the first path of infrared image and the second path of infrared image to the infrared image processing module;
the infrared image processing module processes the first path of infrared image and the second path of infrared image, determines the position of SF6 gas leakage, and displays the processed infrared images through the display module.
As a preferred embodiment of the present invention: the infrared light splitting element splits infrared radiation into two paths of transmission infrared radiation and reflection infrared radiation, and the infrared band elimination filter is arranged on an infrared radiation transmission light path.
Further, the infrared band elimination filter is arranged on a light path for reflecting infrared radiation.
The further technical scheme of the invention is as follows: the infrared image processing module is used for carrying out image processing on the first path of infrared image and the second path of infrared image and determining the position of SF6 leaked gas; the method specifically comprises the following steps:
respectively carrying out non-uniform correction processing on the first path of infrared image and the second path of infrared image;
registering the corrected first path of infrared image and the second path of infrared image to obtain a registered image;
carrying out difference processing on the registration image to obtain a difference image;
locating the position of the SF6 gas leak in the differential image;
the SF6 gas leakage area in the differential image is determined and labeled.
The invention has the beneficial effects that:
according to the invention, the SF6 gas has strong absorption characteristic at the infrared wavelength near 10.55 mu m, the infrared light splitting element is utilized to split scene infrared radiation into two paths of transmission infrared radiation and reflection infrared radiation, and the two paths of infrared images are subjected to differential processing to detect SF6 gas leakage, so that the SF6 gas leakage monitoring device has the advantages of high sensitivity and rapid and accurate positioning of leakage position.
Drawings
Fig. 1 is a structural diagram of an embodiment of a spectroscopic infrared imaging monitoring device for SF6 gas leakage according to the present invention;
fig. 2 is a structural diagram of an embodiment of the spectroscopic infrared imaging monitoring device for SF6 gas leakage according to the present invention;
FIG. 3 is a flowchart of a spectroscopic infrared imaging monitoring method for SF6 gas leakage according to the present invention;
FIG. 4 is a flow chart of an infrared image processing module according to the present invention;
fig. 5 is a schematic processing flow diagram of an infrared image processing module according to the present invention.
Description of reference numerals:
101-infrared radiation, 102-an infrared lens, 103-an infrared light splitting sheet, 104-an infrared band elimination filter, 105-a first infrared focal plane detector, 106-a second infrared focal plane detector, 107-an infrared image processing module and 108-a display module.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
The principle of the invention is as follows:
according to the invention, the SF6 gas has strong absorption characteristic at the infrared wavelength near 10.55 mu m, and SF6 gas leakage becomes visible through imaging of a light-splitting two-way infrared focal plane detector and an advanced infrared image processing technology. The invention utilizes an infrared light splitting element to divide the infrared radiation of a monitored scene into two paths, wherein one path is provided with an infrared band elimination filter with the central wavelength within the range of 10.5-10.6 mu m, and the other path is not provided with the infrared band elimination filter. The optical path without the infrared band-stop filter is affected by absorption of SF6 gas, and the infrared band-stop filter is arranged in the optical path to remove the effect of absorption of SF6 gas. When SF6 gas leakage occurs in the monitored scene, the two paths of infrared image difference processing highlight the SF6 gas leakage position, so that the SF6 gas leakage source position can be quickly and accurately positioned.
Example one
Referring to fig. 1, a structural diagram of an embodiment of the spectroscopic infrared imaging monitoring device for SF6 gas leakage according to the present invention is shown;
as shown in fig. 1, the spectroscopic infrared imaging monitoring device for SF6 gas leakage according to the present invention includes: the system comprises an infrared lens 102, an infrared light splitting element 103, an infrared band elimination filter 104, a first infrared focal plane detector 105, a second infrared focal plane detector 106, an infrared image processing module 107 and a display module 108;
the infrared lens 102 receives scene infrared radiation 101 and outputs the scene infrared radiation to the infrared light splitting element 103, the infrared light splitting element 103 outputs a first path of transmission infrared radiation and a second path of reflection infrared radiation, the first path of transmission infrared radiation is output to a first infrared focal plane detector 105 through the infrared band elimination filter 104, the second path of reflection infrared radiation is output to a second infrared focal plane detector 106, and output ends of the first infrared focal plane detector 105 and the second infrared focal plane detector 106 are connected to the infrared image processing module 107; the output end of the infrared image processing module 107 is connected with the display module 108; the center wavelength of the infrared band stop filter 104 is in the range of 10.5-10.6 μm.
In the embodiment of the invention, the center wavelength of the infrared band elimination filter 104 is 10.5-10.6 μm. Preferably, the center wavelength of the infrared band elimination filter 104 is 10.55 μm. Since the SF6 gas has strong absorption characteristics at the infrared wavelength of 10.55 μm, the light path without the addition of the infrared band-stop filter will be affected by the absorption of the SF6 gas, and the addition of the infrared band-stop filter in the light path is equivalent to removing the effect of the absorption of the SF6 gas. When SF6 gas leakage occurs in the monitored scene, the two paths of infrared image difference processing highlight the SF6 gas leakage position, so that the SF6 gas leakage source position can be quickly and accurately positioned.
The signal transmission process of the embodiment of the invention is as follows: firstly, an infrared light splitting element 103 is utilized to divide monitored scene infrared radiation 101 transmitted by an infrared lens 102 into two paths of transmission infrared radiation and reflection infrared radiation; secondly, after an infrared band elimination filter 104 with the central wavelength within the range of 10.5-10.6 mu m is arranged behind a transmission infrared radiation light path, two paths of infrared radiation respectively enter two infrared focal plane detectors; and finally, the infrared image processing module is used for correcting, registering and differentiating the two infrared images output by the two infrared focal plane detectors, carrying out gas positioning, detection and marking on the differential images, and transmitting the processed images to the display module 108 for display processing.
The infrared splitting element 103 is any one of an infrared splitter, an infrared beam splitter and an infrared splitting prism.
The first infrared focal plane detector 105 and the second infrared focal plane detector 106 adopt any one of a non-refrigeration type long-wave infrared focal plane detector, a non-refrigeration type broad spectrum infrared focal plane detector and a refrigeration type broad spectrum infrared focal plane detector.
In the embodiment of the invention, the infrared lens 102 can be a long-wave infrared lens; the infrared spectroscopic element 103 can select BSW series infrared spectroscopic sheet made of ZnSe base material by Thorlabs company, wherein the spectroscopic ratio is 50:50, and the working wavelength range is 7-14 μm; the first infrared focal plane detector 105 and the second infrared focal plane detector 106 both adopt non-refrigeration long-wave infrared focal plane detectors of amorphous silicon with pixel arrays of 384 multiplied by 288 and response wave bands of 8-14 mu m; the display module 108 may employ a liquid crystal display.
Example two
Referring to fig. 2, a structural diagram of an embodiment of the spectroscopic infrared imaging monitoring device for SF6 gas leakage according to the present invention is shown;
as shown in fig. 2, the spectroscopic infrared imaging monitoring device for SF6 gas leakage according to the present invention includes: the system comprises an infrared lens 102, an infrared light splitting element 103, an infrared band elimination filter 104, a first infrared focal plane detector 105, a second infrared focal plane detector 106, an infrared image processing module 107 and a display module 108;
the infrared lens 102 receives scene infrared radiation 101 and outputs the scene infrared radiation to the infrared light splitting element 103, the infrared light splitting element 103 outputs a first path of transmission infrared radiation and a second path of reflection infrared radiation, the first path of transmission infrared radiation is output to a first infrared focal plane detector 105, and the second path of reflection infrared radiation is output to a second infrared focal plane detector 106 through the infrared band elimination filter 104; the output ends of the first infrared focal plane detector 105 and the second infrared focal plane detector 106 are connected to an infrared image processing module 107; the output end of the infrared image processing module 107 is connected with the display module 108; the center wavelength of the infrared band stop filter 104 is in the range of 10.5-10.6 μm.
In the embodiment of the invention, the center wavelength of the infrared band elimination filter 104 is 10.5-10.6 μm. Preferably, the center wavelength of the infrared band elimination filter 104 is 10.55 μm. Since the SF6 gas has strong absorption characteristics at the infrared wavelength of 10.55 μm, the light path without the addition of the infrared band-stop filter will be affected by the absorption of the SF6 gas, and the addition of the infrared band-stop filter in the light path is equivalent to removing the effect of the absorption of the SF6 gas. When SF6 gas leakage occurs in the monitored scene, the two paths of infrared image difference processing highlight the SF6 gas leakage position, so that the SF6 gas leakage source position can be quickly and accurately positioned.
The signal transmission process of the embodiment of the invention is as follows: firstly, an infrared light splitting element 103 is utilized to divide monitored scene infrared radiation 101 transmitted by an infrared lens 102 into two paths of transmission infrared radiation and reflection infrared radiation; wherein, after an infrared band elimination filter 104 with the central wavelength within the range of 10.5-10.6 μm is arranged in the light path of the reflected infrared radiation, two paths of infrared radiation respectively enter two infrared focal plane detectors; and finally, the infrared image processing module is used for correcting, registering and differentiating the two infrared images output by the two infrared focal plane detectors, carrying out gas positioning, detection and marking on the differential images, and transmitting the processed images to the display module 108 for display processing.
The infrared splitting element 103 is any one of an infrared splitter, an infrared beam splitter and an infrared splitting prism.
The first infrared focal plane detector 105 and the second infrared focal plane detector 106 adopt any one of a non-refrigeration type long-wave infrared focal plane detector, a non-refrigeration type broad spectrum infrared focal plane detector and a refrigeration type broad spectrum infrared focal plane detector.
In the embodiment of the invention, the infrared lens 102 can be a long-wave infrared lens; the infrared light splitting element 103 adopts a zinc selenide substrate infrared light splitting sheet of Edmund Optics company, wherein the light splitting ratio is 50:50, and the working wavelength range is 2-20 mu m; the first infrared focal plane detector 105 and the second infrared focal plane detector 106 can adopt non-refrigeration long-wave infrared focal plane detectors made of vanadium oxide materials with 640 x 512 pixel arrays and 8-14 mu m response wave bands; the display module 108 may employ a liquid crystal display.
EXAMPLE III
Referring to fig. 3, it is a flowchart of a spectroscopic infrared imaging monitoring method for SF6 gas leakage according to the present invention. The spectral infrared imaging monitoring method for SF6 gas leakage comprises the following steps:
202, dividing the infrared radiation into two paths of transmitted infrared radiation and reflected infrared radiation by the infrared light splitting element 103, and after an infrared band elimination filter 104 is arranged in any one of the two paths of light paths, respectively transmitting the two paths of infrared radiation to the first infrared focal plane detector 105 and the second infrared focal plane detector 106;
in step 204, the infrared image processing module 107 processes the first path of infrared image and the second path of infrared image, determines the SF6 gas leakage position, and displays the processed images through the display module 108.
In the embodiment of the present invention, the infrared spectroscopic element 103 is intended to separate infrared radiation into transmitted infrared radiation and reflected infrared radiation, the infrared band elimination filter 104 is intended to generate background radiation that is not affected by the strong absorption characteristics of SF6, and the infrared band elimination filter 104 is disposed in the optical path of the transmitted infrared radiation.
As another embodiment of the invention, an infrared band stop filter 104 is disposed in the path of the reflected infrared radiation.
Referring to fig. 4 and 5, fig. 4 is a flowchart illustrating a processing of an infrared image processing module according to the present invention; fig. 5 is a schematic processing flow diagram of an infrared image processing module according to the present invention.
As shown in fig. 4 and 5, the infrared image processing module processes the first infrared image and the second infrared image to determine a position of the SF6 leaking gas; the method specifically comprises the following steps:
241, respectively carrying out non-uniform correction processing on the first path of infrared image and the second path of infrared image;
at step 245, SF6 gas leakage areas in the differential image are determined and labeled.
In the embodiment of the present invention, various modifications and specific examples of the spectroscopic infrared imaging monitoring apparatus for SF6 gas leakage are also applicable to the spectroscopic infrared imaging monitoring method for SF6 gas leakage in the embodiment, and through the foregoing detailed description of the spectroscopic infrared imaging monitoring apparatus for SF6 gas leakage, those skilled in the art can clearly know the spectroscopic infrared imaging monitoring method for SF6 gas leakage in the embodiment, so for the brevity of the description, detailed description is not repeated here.
While the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and various changes, which relate to the related art known to those skilled in the art and fall within the scope of the present invention, can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (10)
1. A spectral infrared imaging monitoring device facing SF6 gas leakage is characterized by comprising: the infrared image processing device comprises an infrared lens, an infrared light splitting element, an infrared band elimination filter, a first infrared focal plane detector, a second infrared focal plane detector, an infrared image processing module and a display module;
the infrared lens receives scene infrared radiation and outputs the scene infrared radiation to the infrared light splitting element, the infrared light splitting element outputs a first path of infrared radiation and a second path of infrared radiation, the first path of infrared radiation is output to a first infrared focal plane detector through the infrared band elimination filter, the second path of infrared radiation is output to a second infrared focal plane detector, and output ends of the first infrared focal plane detector and the second infrared focal plane detector are connected to the infrared image processing module; the output end of the infrared image processing module is connected with the display module; the center wavelength of the infrared band elimination filter is 10.5-10.6 mu m.
2. The SF6 gas leakage-oriented spectroscopic infrared imaging monitoring device as set forth in claim 1, wherein the first infrared image is transmitted infrared radiation of an infrared spectroscopic element, and the second infrared image is reflected infrared radiation of the infrared spectroscopic element.
3. The SF6 gas leakage-oriented spectroscopic infrared imaging monitoring device as set forth in claim 1, wherein the first infrared image is a reflected infrared radiation of an infrared spectroscopic element, and the second infrared image is a transmitted infrared radiation of the infrared spectroscopic element.
4. The spectroscopic infrared imaging monitoring device for SF6 gas leakage according to claim 1, wherein the infrared band-stop filter has a center wavelength of 10.55 μm.
5. A spectroscopic infrared imaging monitoring device for SF6 gas leakage according to claim 1, wherein the infrared spectroscopic element is any one of an infrared spectroscope, an infrared beam splitter and an infrared beam splitter prism.
6. The SF6 gas leakage-oriented beam splitting type infrared imaging monitoring device as claimed in claim 1, wherein the first infrared focal plane detector and the second infrared focal plane detector are any one of a non-refrigeration type long-wave infrared focal plane detector, a non-refrigeration type broad spectrum infrared focal plane detector and a refrigeration type broad spectrum infrared focal plane detector.
7. The spectroscopic infrared imaging monitoring device for SF6 gas leakage according to claim 1, which provides a spectroscopic infrared imaging monitoring method for SF6 gas leakage, comprising the following steps:
the infrared lens receives scene infrared radiation and transmits the scene infrared radiation to the infrared light splitting element;
the infrared light splitting element divides the infrared radiation into two paths of transmission infrared radiation and reflection infrared radiation, wherein the first path is transmitted to a first infrared focal plane detector through an infrared band elimination filter, and the second path is transmitted to a second infrared focal plane detector;
the first infrared focal plane detector and the second infrared focal plane detector respectively acquire a first path of infrared image and a second path of infrared image and transmit the first path of infrared image and the second path of infrared image to the infrared image processing module;
the infrared image processing module processes the first path of infrared image and the second path of infrared image, determines the position of SF6 gas leakage, and displays the processed infrared images through the display module.
8. A spectral infrared imaging monitoring device for SF6 gas leakage according to claim 7, wherein the infrared spectroscopic element divides infrared radiation into two paths of transmitted infrared radiation and reflected infrared radiation, and the infrared band elimination filter is disposed on the optical path of the transmitted infrared radiation.
9. The spectroscopic infrared imaging monitoring device for SF6 gas leakage according to claim 7, wherein the infrared band elimination filter is disposed on the path of the reflected infrared radiation.
10. The spectroscopic infrared imaging monitoring device for SF6 gas leakage according to claim 7, wherein the infrared image processing module performs image processing on the first infrared image and the second infrared image to determine a SF6 gas leakage position; the method specifically comprises the following steps:
respectively carrying out non-uniform correction processing on the first path of infrared image and the second path of infrared image;
registering the corrected first path of infrared image and the second path of infrared image to obtain a registered image;
carrying out difference processing on the registration image to obtain a difference image;
locating the position of the SF6 gas leak in the differential image;
the SF6 gas leakage area in the differential image is determined and labeled.
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