JP7023498B2 - Inspection equipment for photovoltaic panels - Google Patents

Description

The present invention relates to an inspection device for a photovoltaic power generation panel, which can automatically detect damage to a photovoltaic power generation panel by an image captured from the sky.

In every country, electricity needs to be generated in order to shape a civilized life. Hydroelectric power generation, thermal power generation, nuclear power generation, etc. are carried out for this power generation, and these power plants are maintained. On the other hand, power generation using renewable energy is becoming widespread due to the recent increase in environmental protection awareness, reduction of carbon dioxide emissions for global warming, and reduction of fossil fuel usage.

Photovoltaic power generation has come to be performed as one of the power generation by this renewable energy, and it is beginning to spread in Japan and other countries. In countries and regions with high penetration rates, it has covered about several percent of the total amount of power generation. Solar power generation equipment is installed in various places to realize solar power generation.

In countries where such solar power generation is becoming more widespread, a large number of solar power generation panels are lined up in the same area, and mega-solars that generate large amounts of megawatt-class power are being installed. Large-scale photovoltaic power generation devices such as this mega-solar have been installed to generate electricity comparable to that of conventional power plants.

Large photovoltaics, such as mega-solar, have a large number of photovoltaic panels. Due to the recent decline in the price of photovoltaic power generation panels, it has become possible to realize large-scale photovoltaic power generation devices that combine a large number of photovoltaic power generation panels.

Such a large-scale photovoltaic power generation device is configured by combining several thousand or more photovoltaic power generation panels. A large number of PV panels are installed side by side and each is electrically connected. In addition, a power conditioner and a storage battery are provided in each required section so that the generated power can be efficiently taken out.

Large-scale photovoltaic power generation devices having such a configuration are often installed in vacant lots. However, in many countries and regions, including Japan, there are often not enough vast plains. For this reason, in the plains where there are buildings around, vacant lots in the surplus gaps are often utilized. Alternatively, depressions in the mountains may be utilized. Alternatively, a large site such as a factory site or a station site may be used.

Large-scale photovoltaic power generation devices tend to be installed in vacant lots in such gaps. As mentioned above, large photovoltaics such as megasolar use many photovoltaic panels. That is, the entire area is very large. As a result, large-scale photovoltaic power generation devices that occupy a very large area are installed in vacant lots such as gaps.

The photovoltaic power generation device can realize optimum power generation when each of the photovoltaic power generation panels constituting the photovoltaic power generation device operates normally and appropriately. If any of the photovoltaic panels deteriorates, fails, or malfunctions, the photovoltaic power generation device cannot achieve optimum power generation. For example, the amount of power generation may drop significantly or power generation may become difficult.

In particular, if any of the many photovoltaic power generation panels included in the large photovoltaic power generation device is damaged, the operation of the entire photovoltaic power generation device may malfunction. Alternatively, there arises a problem such as a decrease in the power generation capacity of the entire photovoltaic power generation device.

Here, as the damage of the photovoltaic power generation panel, there may be damage (cracking, scratches, etc.) of the glass member constituting the panel. If the photovoltaic power generation panel is damaged, the photovoltaic power generation panel cannot exert its power generation capacity. A photovoltaic power generation device including such a photovoltaic power generation panel reduces its power generation capacity.

In addition, damage to the glass member may cause rainwater to permeate, leading to electric leakage or failure of the photovoltaic power generation panel. If a photovoltaic power generation panel with a broken glass member fails, repair costs and labor may increase. In particular, in a photovoltaic power generation device provided with a large number of photovoltaic power generation panels, it is difficult to determine which photovoltaic power generation panel causes a failure due to damage. If left unattended due to this difficulty, there is a problem that it leads to a malfunction of the entire photovoltaic power generation device.

At present, workers are visually inspecting each of the photovoltaic power generation panels. However, as described above, a large number of photovoltaic power generation panels are installed in the photovoltaic power generation device, and it is difficult to visually inspect all of them. In addition, there is a problem that it is difficult to visually find cracks in the glass member.

In addition, the photovoltaic power generation panel is installed in a gap area such as a mountainous area or a lake surface, and it is difficult for an operator to visually check it at the site. This is because you have to climb the slopes of the mountains or walk through the vast grounds to check.

On the other hand, being able to detect damage to the glass member of the photovoltaic power generation panel at an early stage is preferable in the maintenance and management (maintenance) of the photovoltaic power generation device. This is to maintain continuous and optimal power generation throughout the photovoltaic power generation system.

As a technique related to a similar inspection, a technique for detecting a crack in a glass member of an electronic device has been proposed (see, for example, Patent Document 1 and Patent Document 2).

Japanese Unexamined Patent Publication No. 10-318722 Japanese Unexamined Patent Publication No. 2015-146371

Patent Document 1 irradiates light including red light from the back surface side of the semiconductor component 100 by the irradiating means 111, and the inspection means 103 to 105 are based on the image and the intensity of the light obtained by the red transmitted light acquired by the imaging means 113. The shape and thickness of the thin film processed portion are uniformly detected, and the defect or broken portion of the semiconductor component 100 is detected and checked for quality, and the shape of the portion that does not transmit light is detected based on the acquired image of transmitted light. Disclosed is a semiconductor component inspection device that inspects the quality of a semiconductor component and inspects the presence or absence of glass breakage based on the acquired image of white light.

Patent Document 1 irradiates one of the glass members with irradiation light, and detects cracks in the glass member based on a comparison between the transmitted light transmitted through the glass member and the irradiation light. Therefore, there is a problem that it cannot be applied when the glass member does not easily transmit the irradiation light. In this respect, the photovoltaic power generation panel contains a material that blocks the transmission of light on the back surface, and there is a problem that damage cannot be detected by using the technique of Patent Document 1 that uses transmitted light.

Further, Patent Document 1 is a technique for inspecting an inspection object in a factory or a laboratory, and is not suitable for inspection of a photovoltaic power generation panel included in a photovoltaic power generation device installed in a wide outdoor space. There is.

Patent Document 2 describes solar by mounting an infrared camera on a radiocon helicopter, remotely operating the radiocon helicopter and the infrared camera to shoot an infrared image of a solar panel, and outputting the shot infrared image to a video monitor. We disclose a solar panel failure diagnosis system that detects and identifies defective parts of the panel 50 and performs failure diagnosis.

The technology of Patent Document 2 aims to diagnose a failure of a solar panel and respond to repair or replacement by taking an image of the solar panel from the sky with a radio-controlled helicopter and analyzing the image.

However, the technique of Patent Document 2 only captures an image from the sky, and although it is possible to see the appearance of the entire photovoltaic power generation panel, it is not possible to detect damage such as cracks. This is because the damage may be so fine or thin that it is almost indistinguishable only from the appearance of the photograph taken from the sky. Another reason is that many cracks and the like do not reach the surface cleanly, and it is often not possible to tell from the surface photograph alone.

Further, it is difficult to find out the damage of the photovoltaic power generation panel only by manually viewing the image by the method disclosed in Patent Document 2. Or even if this is analyzed, it is not concrete and damage cannot be detected.

As described above, in the prior art, there is a problem that damage such as cracks of a large number of solar power generation panels installed in a solar power generation device cannot be detected with high accuracy and efficiency.

An object of the present invention is to provide an inspection device for a photovoltaic power generation panel, which can detect damage such as cracks in a photovoltaic power generation panel installed in a photovoltaic power generation device with high accuracy and efficiency.

In view of the above problems, the photovoltaic power generation panel inspection device of the present invention includes an irradiation unit that irradiates the photovoltaic power generation panel with inspection light from above the photovoltaic power generation panel.
An image pickup unit that captures an image captured by the photovoltaic power generation panel, including the reflected light of the inspection light, from the sky above the photovoltaic power generation panel.
A detection unit that detects abnormal image parts included in the captured image,
It is equipped with a determination unit that determines that the photovoltaic power generation panel contains damage based on the abnormal image portion.
The detection unit detects, in the captured image of the photovoltaic power generation panel, a part where at least one of the difference from the surroundings and the difference from the reference image occurs as an abnormal image part.
The irradiation unit can change at least one of the frequency and wavelength of the inspection light.

The inspection device for a photovoltaic power generation panel of the present invention can detect damage such as cracks based on an abnormal image included in an image captured from the sky. Therefore, it is possible to cope with the characteristics of the photovoltaic power generation panel, which is difficult for light to pass through. Further, the captured image is captured in a state of being irradiated with irradiation light from the sky. For this reason, an abnormal image that can be easily confirmed appears at a damaged part such as a crack. Together, these can easily and reliably detect damage such as cracks.

Further, when the irradiation light from the sky is output, the position information based on the GPS data is also taken into consideration, so that it is possible to identify which part of a large number of photovoltaic power generation panels is damaged.

In addition, by detecting damage in the captured image based on the irradiation light from the sky, it is possible to save labor and automate the work, and it is possible to efficiently inspect many photovoltaic power generation panels. In addition, the detection accuracy can be improved by various conversions of the captured image, which is a great merit.

It is a photograph showing an example of the installed solar power generation device. It is a photograph showing an example of the installed solar power generation device. It is a schematic diagram which shows the state of inspection of the photovoltaic power generation panel by the inspection apparatus of the photovoltaic power generation panel in Embodiment 1 of this invention. It is a block diagram of the inspection device of a photovoltaic power generation panel. FIG. 5 is a schematic diagram showing a captured image according to the first embodiment of the present invention and showing a captured image in a normal state. FIG. 3 is a schematic diagram showing a captured image according to the first embodiment of the present invention, including an abnormal image portion. It is a block diagram of the inspection apparatus of the photovoltaic power generation panel in Embodiment 2 of this invention. It is a block diagram of the inspection apparatus of the photovoltaic power generation panel in Embodiment 2 of this invention. It is a block diagram of the inspection apparatus provided with the attitude control part in Embodiment 2 of this invention. It is a block diagram of the inspection apparatus which includes the temperature distribution detection part in Embodiment 2 of this invention. It is a photograph of the photovoltaic power generation panel including the temperature distribution in the second embodiment of the present invention.

The inspection device for a photovoltaic power generation panel according to the first aspect of the present invention includes an irradiation unit that irradiates the photovoltaic power generation panel with inspection light from above the photovoltaic power generation panel.
An image pickup unit that captures an image captured by the photovoltaic power generation panel, including the reflected light of the inspection light, from the sky above the photovoltaic power generation panel.
A detection unit that detects abnormal image parts included in the captured image,
It is equipped with a determination unit that determines that the photovoltaic power generation panel contains damage based on the abnormal image portion.
The detection unit detects a portion of the captured image of the photovoltaic power generation panel in which at least one of the difference from the periphery and the difference from the reference image occurs as an abnormal image portion.

With this configuration, the photovoltaic power generation panel can be imaged from the sky and inspected for damage. Inspection efficiency and inspection accuracy can be improved while reducing the human burden. This inspection can solve the problem of the photovoltaic power generation panel at an early stage and maintain the power generation capacity of the entire photovoltaic power generation device.

In the photovoltaic power generation panel inspection device according to the second invention of the present invention, in addition to the first invention, the portion where the difference from the surroundings occurs is the photovoltaic power generation in the captured image of the photovoltaic power generation panel. Includes at least one difference in brightness, chromaticity, reflection and scattering conditions in contrast to the perimeter within the panel.

With this configuration, an image including a state in which the inspection light is reflected instead of the normal state due to damage or the like can be used as a predictor of damage. The inspection light often fluctuates due to breakage, and the breakage can be detected with high accuracy.

In the inspection device for the photovoltaic power generation panel according to the third aspect of the present invention, in addition to the first invention, the detection unit uses a reference image of an image taken in a normal state in which the photovoltaic power generation panel is not damaged. Remember as
The portion where the difference from the reference image occurs includes at least one difference in brightness, chromaticity, reflection state, and scattering state in the comparison between the captured image of the photovoltaic power generation panel and the reference image.

With this configuration, an abnormal state due to temporal changes can be detected as an abnormal image region caused by damage or the like. By making a judgment in response to a change over time, it is possible to inspect the damage due to the change over time.

In the inspection device for the photovoltaic power generation panel according to the fourth aspect of the present invention, in addition to the second or third invention, the determination unit is abnormal when the difference in brightness of the abnormal image portion is more than a predetermined value. It is determined that the photovoltaic power generation panel including the image part contains damage.

With this configuration, when the difference in luminance is large, it can be determined that the damage is included.

In the inspection device for the photovoltaic power generation panel according to the fifth aspect of the present invention, in addition to the second or fourth invention, the determination unit determines that the difference in chromaticity of the abnormal image portion is more than a predetermined value. It is determined that the photovoltaic power generation panel including the abnormal image part contains damage.

With this configuration, damage can be determined with high probability based on the degree of change in chromaticity caused by damage.

In the inspection device for the photovoltaic power generation panel according to the sixth aspect of the present invention, in addition to the second to fifth inventions, the detection unit detects a portion of the captured image including an abnormal reflection image or a scattered image as an abnormal image. Detected as a site,
When the abnormal image portion is detected by the reflected image or the scattered image, the determination unit determines that the photovoltaic power generation panel including the abnormal image portion contains damage.

With this configuration, if the degree of change in the reflected image caused by the damage is large, it can be determined that there is damage. As a result, damage can be detected from the captured image with high probability.

In the inspection device for the photovoltaic power generation panel according to the seventh aspect of the present invention, in addition to the second to sixth inventions, the detection unit includes a frequency conversion unit that converts the captured image into time and frequency to generate a frequency image. Have and
The detection unit detects the part where the frequency difference occurs in the frequency image as an abnormal image part, and detects it.
When the difference in frequency is equal to or greater than a predetermined value, the determination unit determines that the photovoltaic power generation panel including the abnormal image portion contains damage.
The difference in frequency is a difference from the periphery in the photovoltaic power generation panel or a difference from the reference image.

With this configuration, damage can be detected with higher accuracy based on the difference in frequency in the frequency image.

In the photovoltaic panel inspection device according to the eighth aspect of the present invention, in addition to any one of the second to seventh inventions, the image pickup unit captures the photovoltaic panel in the infrared frequency region and makes an infrared image. As an image taken,
The detection unit detects the part where the brightness difference occurs in the infrared image as an abnormal image part, and detects it.
When the difference in brightness is equal to or greater than a predetermined value, the determination unit determines that the photovoltaic power generation panel including the abnormal image portion is damaged.
The difference in brightness is the difference from the periphery in the photovoltaic power generation panel or the difference from the reference image.

With this configuration, damage can be detected with high accuracy while the change in brightness is emphasized.

In the solar power generation panel inspection device according to the ninth aspect of the present invention, in addition to any one of the first to eighth inventions, a positioning unit for positioning the position of the irradiation unit is further provided.
The position measuring unit can obtain the position information of the photovoltaic power generation panel that is the target of the captured image.

With this configuration, it is possible to identify the photovoltaic panel that is damaged.

In the photovoltaic power generation panel inspection device according to the tenth aspect of the present invention, in addition to the ninth invention, the determination unit can determine the damage of the photovoltaic power generation panel including the position information.

With this configuration, it is possible to identify the damaged photovoltaic power generation panel and connect it to repairs and the like.

In the photovoltaic power generation panel inspection device according to the eleventh invention of the present invention, in addition to any one of the first to tenth inventions, the irradiation unit can irradiate the photovoltaic power generation panel with the inspection light substantially vertically. Further, a posture control unit for controlling the posture of the irradiation unit is provided.

With this configuration, it is possible to reliably image an abnormal image portion.

In the inspection device for the photovoltaic power generation panel according to the twelfth invention of the present invention, in addition to the first to eleventh inventions, the irradiation unit has at least one of the frequency, wavelength and irradiation range of the inspection light. It can be changed.

With this configuration, it is possible to reliably capture an abnormal image portion.

In the inspection device for the photovoltaic power generation panel according to the thirteenth invention of the present invention, in addition to the twelfth invention, the detection unit has the frequency, wavelength and frequency of the inspection light from the irradiation unit when the abnormal image portion cannot be detected. Change at least one of the irradiation areas.

With this configuration, it is possible to reduce the possibility of overlooking an abnormal image region. As a result, it becomes easier to prevent the damage from being overlooked.
In addition to any one of the first to thirteenth inventions, the photovoltaic panel inspection device according to the fourteenth aspect of the present invention further includes a temperature distribution detection unit for detecting the temperature distribution of the photovoltaic panel.
When the temperature of the portion detected by the detection unit as the abnormal image portion is higher than the ambient temperature, the determination unit determines that the photovoltaic power generation panel including the abnormal image portion is not damaged.

With this configuration, it is possible to prevent erroneous recognition due to temperature changes.

In the inspection device for the photovoltaic power generation panel according to the fifteenth aspect of the present invention, the position measuring unit can measure the position in synchronization with the irradiation timing of the inspection light by the irradiation unit.

With this configuration, it is possible to align the irradiation timing with the imaging and the position.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Target solar power generation device)
The inspection device for the photovoltaic power generation panel of the present invention (hereinafter, abbreviated as "inspection device" if necessary) is the sun installed in various places such as the ground, the lake surface, the water surface, the top of a building, and the mountainous area. The inspection target is the photovoltaic power generation panel included in the photovoltaic power generation device. It may be a small-scale solar power generation device or a large-scale solar power generation device called a mega solar.

1 and 2 are photographs showing an example of an installed photovoltaic power generation device. Depending on the terrain, such an amorphous photovoltaic power generation device 100 can be obtained. Further, since the amount of power generated by the photovoltaic power generation device 100 is determined by the number of photovoltaic power generation panels 200 constituting the photovoltaic power generation device 100, it is desired to include a large number of photovoltaic power generation panels 200. For this reason, large-scale photovoltaic power generation devices 100 tend to be installed in complicated terrain.

It is difficult to visually inspect the photovoltaic power generation panel 200 in the photovoltaic power generation device 100 including many photovoltaic power generation panels 200 and the photovoltaic power generation device 100 installed in a complicated terrain. It is in a state of being.

The same applies to the photovoltaic power generation device 100 installed on the surface of a lake or water. It is also difficult to visually inspect the photovoltaic power generation device 100 installed in such a place. On the other hand, the photovoltaic power generation panel 200 included in the photovoltaic power generation device 100 installed on a large-scale or complicated terrain may be damaged due to various circumstances.

Due to the large number of photovoltaic panels, there is a high possibility of damage and it is difficult to detect damage. Alternatively, there is a high possibility that unexpected damage will occur due to the characteristics of the place where it is installed. For example, if it is installed in a mountainous area, it may be damaged by a small rockfall. Alternatively, if it is installed on the surface of the water, it may be damaged by the waves.

The inspection device of the present invention can cope with such a case.

(Embodiment 1)

(Overview)
FIG. 3 is a schematic diagram showing a state of inspection of a photovoltaic power generation panel by the photovoltaic power generation panel inspection device according to the first embodiment of the present invention. FIG. 4 is a block diagram of an inspection device for a photovoltaic power generation panel.

As shown in FIG. 3, the inspection device is used by being incorporated in the flying object 300. The flying object 300 may be, for example, an unmanned aerial vehicle called a drone. An air vehicle 300 capable of flying with a propeller flies over the photovoltaic power generation panel 200. While flying over this, the inspection device incorporated in the flying object 300 irradiates the photovoltaic power generation panel 200 with the inspection light, so that the inspection device executes the inspection.

Of course, the flying object 300 may be an flying object that flies by a jet engine instead of a propeller, or may fly by other power. It suffices as long as it is possible to irradiate and image from the sky above the photovoltaic power generation panel 200.

In this way, the inspection device can be incorporated into the flying object 300 (or integrated with the flying object 300, or has the function of the flying object 300) to fly over the photovoltaic power generation panel 200. You can inspect the damage while flying. It is possible to reliably inspect the photovoltaic power generation panel 200 installed in any place by avoiding visual inspection by human power, inspection from the ground on rugged terrain, inspection difficulty on the water surface, and the like.

Such an inspection device 1 includes the elements shown in FIG.

The inspection device 1 includes an irradiation unit 2, an image pickup unit 3, a detection unit 4, and a determination unit 5.

The irradiation unit 2 irradiates the photovoltaic power generation panel 200 with the inspection light A, which is the light for inspection, from the sky above the photovoltaic power generation panel 200. The light trail A indicated by the arrow in FIGS. 3 and 4 indicates the inspection light A. When the photovoltaic power generation device 100 includes a large number of photovoltaic power generation panels 200, the irradiation unit 2 irradiates the individual photovoltaic power generation panels 200 with the inspection light A.

At this time, the irradiation unit 2 evenly irradiates the photovoltaic power generation panel 200 with the inspection light A. The inspection light A takes an image of the photovoltaic power generation panel 200 irradiated with the inspection light A when the image pickup unit 3 takes an image. Therefore, the irradiation unit 2 irradiates the photovoltaic power generation panel 200 with the inspection light A in a state of being paired with the image pickup unit 3.

As described above, the inspection light A needs to irradiate the portion to be imaged by the image pickup unit 3. Therefore, the irradiation unit 2 irradiates the inspection light A in accordance with the image pickup of the image pickup unit 3. At this time, since the image pickup unit 3 images the solar power generation panel 200 evenly, it is preferable that the irradiation unit 2 also irradiates the inspection light A evenly.

For example, when the imaging unit 3 captures a large number of still images, the irradiation unit 2 may irradiate the inspection light A in accordance with the imaging timing. Alternatively, when the imaging unit 3 captures a moving image, the irradiation unit 2 may continue to irradiate the inspection light A while the imaging unit 3 is imaging.

As described above, it is preferable that the irradiation unit 2 irradiates the inspection light A in accordance with the image pickup of the image pickup unit 3. Therefore, it is also preferable that the irradiation unit 2 is incorporated in the image pickup unit 3. This is because the operation of the image pickup unit 3 and the operation of the irradiation unit 2 become the same by being incorporated. This is because the image pickup unit 3 may irradiate the inspection light A when the image pickup operation is started.

The image pickup unit 3 takes an image of the photovoltaic power generation panel 200. Since the image pickup unit 3 itself has an image pickup function, it is possible to take an image of various objects, not limited to the photovoltaic power generation panel 200. Further, the photovoltaic power generation panel 200 can be imaged while being mounted on the flying object 300, or the photovoltaic power generation panel 200 can be imaged in other states.

The image pickup unit 3 takes an image of the photovoltaic power generation panel 200 from the sky while being mounted on the flying object 300. At this time, the irradiation unit 2 irradiates the surface of the photovoltaic power generation panel 200 with the inspection light A. The image pickup unit 3 takes an image of the photovoltaic power generation panel 200 in the irradiated state.

Therefore, the photovoltaic power generation panel 200 irradiated with the inspection light A is captured in the captured image captured by the imaging unit 3. As a matter of course, the photovoltaic power generation panel 200 in a state of reflecting the irradiated inspection light A is captured in the captured image.

The image pickup unit 3 captures an image of the photovoltaic power generation panel 200 in a state of reflecting the inspection light A irradiated in this way as an image to be captured. In accordance with the flight of the flying object 300, the image pickup unit 3 interlocks with the irradiation unit 2 to take an image of the entire photovoltaic power generation panel 200 and obtain the image data of the image.

The image pickup unit 3 outputs the data of the captured image to the detection unit 4. The detection unit 4 can obtain the data of the captured image.

The detection unit 4 detects an abnormal image portion included in the captured image obtained from the image pickup unit 3. The abnormal image portion is a portion in the captured image of the photovoltaic power generation panel 200 that is an image in an abnormal state different from the normal state.

FIG. 5 is a captured image according to the first embodiment of the present invention, and is a schematic diagram showing a captured image in a normal state. The captured image 500 is an image of the photovoltaic power generation panel 200. FIG. 5 shows a captured image 500 captured in a normal state in which the photovoltaic power generation panel 200 is not damaged.

FIG. 6 is a captured image according to the first embodiment of the present invention, and is a schematic diagram showing a captured image including an abnormal image portion.

The captured image 500 is captured in a state of reflecting the inspection light A as described above. If the photovoltaic power generation panel 200 is not damaged, the captured image 500 obtained by irradiation with the inspection light A is visually recognized as a normal state as shown in FIG.

On the other hand, when the photovoltaic power generation panel 200 is damaged or has other abnormalities, an abnormal image portion 510 imaged as an abnormal state occurs in a part thereof. FIG. 6 is an image including the abnormal image portion 510. The abnormal image portion 510 causes reflection, scattering, diffuse reflection, and the like different from those in the periphery.

The detection unit 4 detects that the captured image 500 includes the abnormal image portion 510. As shown in FIG. 5, when there is no abnormal image part 510, it is detected as having no abnormal image part, and as shown in FIG. 6, when there is an abnormal image part 510, it is detected as having an abnormal image part 510. do.

The detection unit 4 outputs the detection result of the abnormal image portion 510 to the determination unit 5.

Based on the abnormal image portion 510, the determination unit 5 determines whether or not the photovoltaic power generation panel 200, which is the target of the captured image 500, contains damage. In the captured image 500 of FIG. 5, the abnormal image portion 510 is not included. Therefore, it is determined that the photovoltaic power generation panel 200, which is the target of the captured image of FIG. 5, is not damaged. On the other hand, the captured image 500 of FIG. 6 includes an abnormal image portion 510. Therefore, it is determined that the photovoltaic power generation panel 200A, which is the target of the captured image of FIG. 6, may be damaged.

Here, as will be described later, the determination unit 5 may determine the presence or absence of damage depending on the level and state of the abnormal image portion 510.

As described above, the detection unit 4 detects the abnormal image portion 510. At this time, in the captured image of the photovoltaic power generation panel 200, the portion where the difference from the periphery (periphery in the photovoltaic power generation panel 200) is generated is detected as the abnormal image portion 510. For example, in FIG. 6, the abnormal image portion 510 is an image different from the periphery of the photovoltaic power generation panel 200 included in the captured image 500.

Alternatively, an image taken during normal times in which the photovoltaic power generation panel 200 is not damaged is set as a reference image. For example, the captured image 500 in FIG. 5 is a reference image. The detection unit 4 detects a portion where a difference occurs in comparison with the reference image as an abnormal image portion 510.

That is, the detection unit 4 detects a portion inside the current captured image 500 that is different from the surroundings and a portion that is different from the past image as the abnormal image portion 510.

In this way, based on the result of detecting the abnormal image portion 510, the determination unit 5 determines that the photovoltaic power generation panel 200 contains damage. At this time, since the captured image 500, which is a prerequisite for detecting the abnormal image portion 510, is an image of the photovoltaic power generation panel 200, the photovoltaic power generation panel 200 can be inspected evenly. In particular, when the captured image 500 is a moving image, it can be inspected without exception.

Next, the details of each part will be described.

(Irradiated part)
The irradiation unit 2 irradiates the photovoltaic power generation panel 200 with the inspection light A in accordance with the image pickup of the image pickup unit 3. Therefore, the irradiation unit 2 may operate to irradiate the inspection light A while the image pickup unit 3 is in the imaging state. For example, the irradiation unit 2 may operate in conjunction with the image pickup unit 3. When the image pickup unit 3 starts imaging, the irradiation unit 2 may start operation to irradiate the inspection light A.

As the inspection light A, for example, a laser light may be used. This is because the laser beam has high straightness and facilitates image pickup by the image pickup unit 3. This is because the image pickup unit 3 needs to take an image of the photovoltaic power generation panel 200 in a state where the inspection light A is irradiated.

Further, it is also preferable that the irradiation unit 2 appropriately changes the irradiation width, irradiation brightness, irradiation chromaticity, irradiation time, etc. of the inspection light A to be irradiated. For example, if the irradiation width of the inspection light A to be irradiated is increased, the imaging time by the imaging unit 3 can be shortened. This is because it is necessary to irradiate the photovoltaic power generation panel 200 to be imaged with the inspection light A while the image pickup unit 3 is taking an image, and if the irradiation width is large, the irradiation time to the image pickup target range can be shortened. ..

Further, in order to make it easier to find the abnormal image portion 510, it is also preferable that the irradiation unit 3 changes the irradiation brightness and the irradiation chromaticity of the inspection light A. This is because it is preferable that the inspection light A has a brightness and chromaticity that make it easy to detect the abnormal image portion 510 according to the weather, the color of the photovoltaic power generation panel 200, and the like.

While the imaging unit 3 is imaging the imaging range, the flying object 300 may fly in the imaging range and continue to irradiate the inspection light A.

(Image pickup unit)
The image pickup unit 3 takes an image of the photovoltaic power generation panel 200 to be imaged. At this time, the imaging unit 3 may continuously open the optical mechanism for imaging to capture the captured image 500 as a moving image. Alternatively, the captured image 500 may be captured as a still image. Even when the captured image 500 as a moving image is captured, the detection unit 4 may cut and process the captured image 500 as a moving image as a plurality of still images.

The captured image 500 shown in FIGS. 5 and 6 is a still image for the sake of illustration, but may be a moving image.

The image pickup unit 3 takes an image of the photovoltaic power generation panel 200 in a state where the inspection light A is irradiated by the irradiation unit 2. The fact that the inspection light A is irradiated means that the inspection light A is reflected in the photovoltaic power generation panel 200. In this reflected state, the captured image 500 of the photovoltaic power generation panel 200 is imaged.

Therefore, as described above, the inspection light A from the irradiation unit 2 is irradiated to the range imaged by the image pickup unit 3.

As shown in FIGS. 5 and 6, the image pickup unit 3 may capture the captured image 500 as a visible image. Alternatively, it may be imaged as a luminance image or as an infrared image. It suffices if the detection unit 4 can create a state in which the abnormal image portion 510 can be easily detected.

Further, when the abnormal image portion 510 is included, the imaging unit 3 preferably captures the image so that it is clearly reflected in the captured image 500. Therefore, it is preferable that the irradiation axis of the inspection light A from the irradiation unit 2 and the image pickup axis of the image pickup unit 3 are substantially viewed. In this respect as well, it is preferable that the irradiation unit 2 and the image pickup unit 3 operate in conjunction with each other.

(Detection unit)
As described above, the detection unit 4 detects whether the captured image 500 includes the abnormal image portion 510. At this time, a portion having a difference from the periphery or the reference image is detected as an abnormal image portion 510.

The portion where this difference occurs includes at least one difference in brightness, chromaticity, reflection state, and scattering state in comparison with the periphery of the photovoltaic power generation panel 200 of the captured image 500. That is, in the photovoltaic power generation panel 200 shown in the captured image, a portion where at least one of the brightness, the chromaticity, the reflection state, and the scattering state is different from the surroundings is referred to as an abnormal image portion 510. To detect.

For example, a portion having high or low luminance and different chromaticity is detected as an abnormal image portion 510. Alternatively, a scattered portion or a portion that is reflected differently from the surroundings is detected as an abnormal image portion 510.

As described above, the detection unit 4 detects the portion of the photovoltaic power generation panel 200 in the captured image 500 where the relative difference from the surroundings occurs as the abnormal image portion 510.

Further, the detection unit 4 may detect a portion having a difference between the reference image and the captured image 500 as an abnormal image portion 510.

As described above, an image captured in a normal state in which the photovoltaic power generation panel 200 to be imaged is not damaged is defined as a reference image. For example, the captured image 500 shown in FIG. 5 may be defined as a reference image. The detection unit 4 includes a storage unit (such as an electronic memory or a semiconductor memory that can store the memory), and the reference image may be stored in this storage unit.

The detection unit 4 detects at least one different portion of the luminance, chromaticity, reflection state, and scattering state as the abnormal image portion 510 in the comparison between the captured image 500 and the reference image. If the captured image 500 contains a portion having a higher or lower luminance as compared with the reference image without damage, the detection unit 4 detects this portion as an abnormal image portion 510. Alternatively, if the captured image 500 includes a portion having a different chromaticity as compared with the reference image, the detection unit 4 detects this portion as the abnormal image portion 510.

Alternatively, if the captured image 500 includes a scattered image or a reflected image as compared with the reference image, the detection unit 4 detects this portion as the abnormal image portion 510.

In this way, the detection unit 4 detects that the captured image 500 includes the abnormal image portion 510. The detection unit 4 outputs this detection result to the determination unit 5.

(Judgment unit)
When the abnormal image portion 510 is included, the determination unit 5 determines whether or not the photovoltaic power generation panel 200 included in the captured image 500 is damaged based on the abnormal image portion 510. The detection of the abnormal image region 510 is as described in the above-mentioned detection unit 4.

Here, when the difference in brightness of the abnormal image portion 510 (in comparison with the surroundings or comparison with the reference image) is equal to or greater than a predetermined value, the determination unit 5 determines the solar power generation panel which is the target of the captured image 500. It is determined that the 200 contains damage.

When the photovoltaic power generation panel 200 has damage such as cracks, the reflected state of the damaged portion is different from that of the surroundings in the captured image reflecting the inspection light A. A part of the inspection light A is absorbed or reflected at a different angle due to the crack. As a result, the brightness of the reflected light of the inspection light A decreases or conversely increases in the damaged portion.

That is, the difference in the brightness of the abnormal image portion 510 in the captured image 500 is likely to indicate the damage of the photovoltaic power generation panel 200. Using this event, the determination unit 5 determines that the damage is included when the difference in luminance is equal to or greater than a predetermined value. This predetermined amount or more may be determined from an empirical or logical point of view.

Alternatively, when the difference in chromaticity of the abnormal image portion 510 is equal to or greater than a predetermined value, the determination unit 5 includes damage to the photovoltaic power generation panel 200 that is the target of the captured image 500 including the abnormal image portion 510. It is determined that there is. The captured image 500 includes the reflected light of the inspection light A. In other words, the image of the photovoltaic power generation panel 200 reflecting the inspection light A is the captured image 500.

If there is damage such as cracks, the reflected light of the inspection light A is refracted. Due to this refraction, the wavelength of the reflected light changes, and the chromaticity can change as compared to a place where the reflected light is reflected as it is without damage. The change in chromaticity is an appropriate index for estimating the presence or absence of damage.

Utilizing this event, the determination unit 5 determines that the photovoltaic power generation panel 200 including the abnormal image portion 510 is damaged when the difference in chromaticity is equal to or greater than a predetermined value. The predetermined amount as a judgment criterion may be determined from an empirical or logical viewpoint. As in the case of luminance, a predetermined amount may be determined from the actual results of the plurality of captured images 500 and the abnormal image portion 510.

As described above, when the captured image 500 includes an abnormal reflected image or a scattered image, the detection unit 4 detects the portion where the reflected image or the scattered image is generated as the abnormal image portion 510.

When the abnormal image portion 510 is detected by the reflected image or the scattered image, the determination unit 5 determines that the photovoltaic power generation panel 200 including the abnormal image portion 510 is damaged.

The captured image 500 is an image of the photovoltaic power generation panel 200 captured in a state of being irradiated with the inspection light A. Here, if there is damage or the like, the inspection light A may be diffusely reflected or refracted at the damaged place. As a result, anomalous reflected or scattered images may occur at the damaged location. The determination unit 5 determines the presence or absence of damage by utilizing such an event.

As described above, the determination unit 5 can determine the damage of the photovoltaic power generation panel 200 based on the existence of the abnormal image portion 510 and its level. The captured image 500 is an image of the photovoltaic power generation panel 200 irradiated with the inspection light A evenly. In addition, it was imaged from the sky by the flying object 300.

Therefore, if there is damage, various events such as brightness, chromaticity, and scattering occur. The determination unit 5 can determine the presence or absence of damage by using this.

With such a configuration, the inspection device 1 in the first embodiment can inspect the photovoltaic power generation panel 200 evenly. In addition, the inspection accuracy can be improved by utilizing the event generated by the inspection light A. Of course, even if there are a large number of photovoltaic power generation panels 200, inspection omissions can be reduced by capturing the entire image.

In addition, since the inspection can be performed based on the image captured from the sky, the human work load can be reduced and the work efficiency and safety can be improved. Only the captured image 500 may be imaged in advance, and then the abnormal image portion 510 may be detected and the damage may be determined, and the imaging work and the inspection work may be separated to improve efficiency.

(Embodiment 2)

Next, the second embodiment will be described. In the second embodiment, various variations will be described.

(Detection by frequency image)
FIG. 7 is a block diagram of the inspection device for the photovoltaic power generation panel according to the second embodiment of the present invention. The detection unit 4 includes a frequency conversion unit 41. The frequency conversion unit 41 performs time-frequency conversion of the captured image output from the image pickup unit 3 to generate a frequency image. For example, a Fast Fourier Transform (FFT) is used to generate a frequency image.

The frequency image generated by the frequency conversion unit 41 shows the captured image 500 with the frequency axis as a reference.

Based on this frequency image, the detection unit 4 detects a portion where a frequency difference occurs as an abnormal image portion 510. The photovoltaic power generation panel 200 is an array of panels having the same appearance and shape, and since the brightness and chromaticity of one photovoltaic power generation panel 200 are flat, there is a portion where a difference in frequency occurs even in a frequency image. not many. For example, the frame part.

The detection unit 4 detects the portion where the frequency difference occurs as the abnormal image portion 510 in consideration of the difference such as the frame portion.

When the difference in frequency is equal to or greater than a predetermined value, the determination unit 5 determines that the photovoltaic power generation panel 200 including the abnormal image portion 510 is damaged. As described in the first embodiment, changes in chromaticity and brightness occur in the abnormal image region 510. Therefore, there is a difference in frequency (or wavelength).

If this difference in frequency is equal to or greater than a predetermined value, it can be determined from empirical accumulation and a logical viewpoint that damage has occurred.

The difference in frequency is a difference from the periphery of the photovoltaic power generation panel 200 or a difference from the reference image. Any of these may be detected as having a difference in frequency.

As described in the first embodiment, by detecting the abnormal image portion 510 in the frequency image instead of the visible image and determining the damage, there is an advantage that the possibility of damage that is difficult to see in the visible image can be detected. Since the brightness and chromaticity change sharply in a narrow range, even if it is difficult to find in a visible image, if it is a frequency image, the abnormal image portion 510 can be detected as a numerical value. This is because when the detection unit 4 detects a frequency image, it is only necessary to find a numerical difference, so that the certainty is improved.

Further, even in the damage determination by the determination unit 5, if it is a frequency image, it is sufficient to compare the numerical value with the predetermined value, so that there is an advantage that the determination becomes easy.

(Infrared image)
It is also preferable that the imaging unit 3 captures the photovoltaic power generation panel 200 in the infrared frequency region and captures the infrared image as the captured image 500. The image pickup unit 3 can capture an infrared image by providing a filter matched to the infrared frequency region.

The image pickup unit 3 outputs this infrared image as an image pickup image 500 to the detection unit 3. The detection unit 3 detects a portion where the brightness difference occurs in the infrared image as an abnormal image portion 510. In the case of an infrared image, the brightness is emphasized. It becomes easy to find the difference in brightness in the image in the state where the brightness is emphasized (and the other information is reduced).

The detection unit 3 detects the difference in luminance in this easy state. This luminance difference portion is detected as an abnormal image portion 510, and the result is output to the determination unit 5.

When the difference in luminance is equal to or greater than a predetermined value, the determination unit 5 determines the abnormal image portion 510 as a damaged portion. That is, it is determined that the photovoltaic power generation panel 200 including the abnormal image portion 510 includes damage.

Here, the difference in luminance in the infrared image may be determined by the difference from the periphery or the difference from the reference image in the infrared image. By observing the difference in brightness in the infrared image, it is possible to determine with higher accuracy whether or not the image is damaged.

As described above, by using the captured image 500 other than the visible image, it is possible to facilitate the detection of the abnormal image portion 510 and improve the accuracy of the damage determination.

(Position measurement)
FIG. 8 is a block diagram of the inspection device for the photovoltaic power generation panel according to the second embodiment of the present invention. The inspection device 1 shown in FIG. 8 further includes a position measuring unit 6.

The position measurement unit 6 is provided with, for example, a position positioning function (GPS function). With this function, the position measuring unit 6 can obtain the position information of the photovoltaic power generation panel 200 to be captured by the captured image 500. By interlocking with the image pickup unit 3, the position information of the photovoltaic power generation panel 200 that is the target of the captured image 500 may be measured.

By the measurement by the position measuring unit 6, the determination unit 5 can determine the presence or absence of damage together with the position information. That is, the position of the damaged photovoltaic power generation panel 200 can be specified. By determining the presence or absence of damage after the position is specified, it becomes easier to take measures after the inspection of the photovoltaic power generation panel 200.

As the position measuring unit 6, the one provided in the flying object 300 may be used.

Further, the position measuring unit 6 may measure the position information in synchronization with the timing of the irradiation of the inspection light A by the irradiation unit 2. That is, the image pickup by the image pickup unit 3 is synchronized with the irradiation timing of the inspection light A by the irradiation unit 2. This is because measuring the position of the captured image is also synchronized with the irradiation timing, so that the irradiation of the inspection light A, the imaging, and the position measurement are all synchronized, and the position of the captured image 500 is accurately associated. ..

With such an accurate association of positions, the actual position of the damaged photovoltaic panel 200 can be easily grasped.

(Attitude control unit)
FIG. 9 is a block diagram of an inspection device including an attitude control unit according to the second embodiment of the present invention. The inspection device 1 shown in FIG. 9 further includes an attitude control unit 7.

The posture control unit 7 controls the posture of the irradiation unit 2 so that the irradiation unit 2 can irradiate the solar power generation panel 200 with the inspection light A substantially vertically. Alternatively, the attitude of the flying object 300 is controlled.

The inspection light A irradiates the surface of the photovoltaic power generation panel 200. The captured image 500 is imaged in this irradiated state. The irradiated state is a state of being reflected by the photovoltaic power generation panel 200, and the photovoltaic power generation panel 200 in this reflected state is imaged as an image.

At this time, it is preferable that the inspection light A uniformly irradiates the photovoltaic power generation panel 200. It is not preferable that the inspection light A to be irradiated becomes non-uniform. Therefore, it is appropriate that the inspection light A irradiates the photovoltaic power generation panel 200 substantially vertically.

The attitude control unit 7 controls the attitude of the irradiation unit 2 or the flying object 300 so that the inspection light A can be irradiated to the photovoltaic power generation panel 200 substantially vertically in this way.

At this time, the posture control unit 7 may control the posture of the irradiation unit 2 by irradiating the photovoltaic power generation panel 200 with test light for testing. For example, if the test light is irradiated and the reflected light can be received on the same optical axis, the posture is controlled as if it is in the correct state.

The attitude control unit 7 is provided in the flying object 300, and the attitude may be controlled while controlling the operating state of the flying object 300.

(Inspection light)
It is also preferable that the irradiation unit 2 can change at least one of the frequency, wavelength and irradiation range of the inspection light A to be irradiated. The inspection light A irradiates the surface of the photovoltaic power generation panel 200, and the imaging unit 3 images the photovoltaic power generation panel 200 in the irradiated state.

Therefore, the irradiation state of the inspection light A is important for detecting the abnormal image region 510. Depending on the frequency and wavelength, it may be easier to capture the abnormal image portion 510 in the captured image. The abnormal image portion 510 causes a change in brightness and chromaticity with the periphery due to damage. This is because the imaging of the abnormal image portion 510 can be reliably performed by irradiating the inspection light A having a frequency or wavelength that easily causes a change in the luminance or chromaticity.

For example, the inspection light A having a frequency or wavelength significantly different from the frequency or wavelength corresponding to the color of the photovoltaic power generation panel 200 is irradiated. As a result, if there is damage or the like, the brightness and chromaticity are likely to change, and the abnormal image portion 510 is likely to be detected.

Further, by increasing or decreasing the irradiation range, it is possible to shorten the imaging time of the captured image 500. In addition, the abnormal image portion 510 corresponding to the damage can be easily included in the captured image 500.

In this respect, it is also preferable to change the irradiation range.

It is also preferable to obtain the captured image 500 while changing the brightness and chromaticity of the inspection light A to be irradiated. This is because the abnormal image portion 510 due to damage or the like can be reliably imaged by the captured image while being changed.

By capturing the captured image 500 while changing or changing the inspection light A by the irradiation unit 2, it becomes possible to more reliably capture the abnormal image portion 510 due to damage or the like.

It is also preferable that the detection unit 3 controls the inspection light A from the irradiation unit 2 when the abnormal image portion 510 cannot be detected in the captured image 500. For example, at least one of the frequency, wavelength and irradiation range of the inspection light A from the irradiation unit 2 is changed. Alternatively, the brightness and chromaticity of the inspection light A are changed.

By making such a change, it becomes possible to make a difference in the captured image 500, whereas the captured image 500 is in a state where the difference in brightness and chromaticity does not occur in spite of the damage. As a result, the abnormal image portion 510 can be included in the captured image 500, and the detection omission of the abnormal image portion 510 can be prevented. That is, it becomes possible to prevent the detection omission of damage.

In FIGS. 8 and 9, the arrows regarding the instructional relationship between the elements are appropriately omitted from the viewpoint of easy viewing of the figure. There is an instruction system corresponding to the above description.

(Temperature distribution detection unit)
FIG. 10 is a block diagram of an inspection device including a temperature distribution detection unit according to the second embodiment of the present invention. FIG. 11 is a photograph of a photovoltaic power generation panel including a temperature distribution according to the second embodiment of the present invention.

The inspection device 1 of FIG. 10 further includes a temperature article detection unit 8 for detecting the temperature distribution of the photovoltaic power generation panel 200.

The temperature distribution detection unit 8 takes an image of the photovoltaic power generation panel 200. FIG. 10 schematically shows a state of imaging. The temperature distribution detection unit 8 takes an image of the entire photovoltaic power generation panel 200 to be inspected. At this time, the image is taken as an infrared image.

By taking an image as an infrared image in this way, the temperature distribution of the photovoltaic power generation panel 200 can be detected. An example taken so that the temperature distribution can be seen is the photograph of FIG.

As shown in FIG. 11, the photovoltaic power generation panel 200 has a temperature distribution. Places where the temperature is high and places where the temperature is relatively low appear.

The detection unit 4 detects the abnormal image portion 510, and the determination unit 5 determines the damage based on the detected abnormal image portion 510. At this time, because the temperature is higher than the surroundings due to hot spots or the like, an image similar to the abnormal image portion 510 may be generated. This is because the high temperature may result in an image as a portion having a different chromaticity, which may look similar to the abnormal image portion 510.

The determination unit 5 determines whether or not the abnormal image portion 510 is a damaged portion in consideration of this.

In the detection result of the temperature distribution detection unit 8, the temperature distribution of the photovoltaic power generation panel 200, which is the target of the captured image 500, can be grasped. When the temperature of the abnormal image portion 510 is higher than the ambient temperature, the determination unit 5 determines that the abnormal image portion 510 is caused by the high temperature. As a result, it can be determined that the damage is not caused.

At this time, the difference in temperature may be determined empirically, and the determination unit 5 may have the respective determination criteria that the temperature is high but there is damage, and the temperature is high so that there is no damage. ..

The temperature distribution detection unit 8 may operate in conjunction with the image pickup unit 3. Alternatively, it may be used in combination with the image pickup function of the image pickup unit 3 to detect the temperature distribution.

In this way, by considering the temperature distribution, it is possible to reduce the possibility that a portion that is not damaged is erroneously determined to be damaged.

As described above, the second embodiment can improve the accuracy of the damage determination in various variations. As a result, it is possible to improve the inspection accuracy of the damaged photovoltaic power generation panel and facilitate maintenance such as repair.

The photovoltaic power generation panel inspection device described in the first and second embodiments is an example for explaining the gist of the present invention, and includes deformation and modification within a range not deviating from the gist of the present invention.

1 Inspection device for photovoltaic power generation panel 2 Irradiation unit 3 Imaging unit 4 Detection unit 41 Frequency conversion unit 5 Judgment unit 6 Positioning unit 7 Attitude control unit 8 Temperature distribution detection unit

Claims (14)

An irradiation unit that irradiates the solar power generation panel with inspection light from the sky above the solar power generation panel,
An image pickup unit that captures an image captured by the photovoltaic power generation panel including the reflected light of the inspection light from the sky above the photovoltaic power generation panel.
A detection unit that detects an abnormal image portion included in the captured image, and a detection unit.
A determination unit for determining that the photovoltaic power generation panel contains damage based on the abnormal image portion is provided.
The detection unit detects a portion of the captured image of the photovoltaic power generation panel in which at least one of the difference from the periphery and the difference from the reference image occurs as the abnormal image portion.
The irradiation unit is an inspection device for a photovoltaic power generation panel capable of changing at least one of the frequency and wavelength of the inspection light. The portion where the difference from the periphery is generated is at least one of brightness, chromaticity, reflection state, and scattering state in the captured image of the photovoltaic power generation panel in comparison with the periphery in the photovoltaic power generation panel. The inspection device for a photovoltaic power generation panel according to claim 1, which includes different parts. The detection unit stores an image captured in a normal state in which the photovoltaic power generation panel is not damaged as the reference image.
The portion where the difference from the reference image occurs includes at least one difference in brightness, chromaticity, reflection state, and scattering state in the comparison between the captured image of the photovoltaic power generation panel and the reference image. , The inspection device for a photovoltaic power generation panel according to claim 1. The second or third aspect of the present invention, wherein the determination unit determines that the photovoltaic power generation panel including the abnormal image portion is damaged when the difference in brightness of the abnormal image portion is greater than or equal to a predetermined value. Solar power panel inspection equipment. Claims 2 to 4 determine that the photovoltaic power generation panel including the abnormal image portion is damaged when the difference in chromaticity of the abnormal image portion is equal to or greater than a predetermined value. The inspection device for the photovoltaic power generation panel described in any of the above. The detection unit detects a portion where the captured image contains an abnormal reflection image or a scattered image as the abnormal image portion.
The determination unit determines that, when the abnormal image portion is detected by the reflected image or the scattered image, the photovoltaic power generation panel including the abnormal image portion is damaged. The inspection device for the photovoltaic power generation panel according to any one of 2 to 5. The detection unit has a frequency conversion unit that generates a frequency image by time-frequency conversion of the captured image.
The detection unit detects a portion of the frequency image in which a frequency difference occurs as the abnormal image portion.
When the difference in frequency is equal to or greater than a predetermined value, the determination unit determines that the photovoltaic power generation panel including the abnormal image portion contains damage.
The inspection device for a photovoltaic power generation panel according to any one of claims 2 to 6, wherein the difference in frequency is a difference from the periphery in the photovoltaic power generation panel or a difference from the reference image. The imaging unit captures the photovoltaic power generation panel in the infrared frequency region and captures an infrared image as the captured image.
The detection unit detects a portion having a difference in brightness in the infrared image as the abnormal image portion.
When the difference in brightness is equal to or greater than a predetermined value, the determination unit determines that the photovoltaic power generation panel including the abnormal image portion is damaged.
The inspection device for a photovoltaic power generation panel according to any one of claims 2 to 7, wherein the difference in brightness is a difference from the periphery in the photovoltaic power generation panel or a difference from the reference image. A positioning unit for positioning the position of the irradiation unit is further provided.
The inspection device for a photovoltaic power generation panel according to any one of claims 1 to 8, wherein the position measuring unit can obtain position information of the photovoltaic power generation panel that is the target of the captured image. The solar power generation panel inspection device according to claim 9, wherein the determination unit can determine damage to the solar power generation panel including the position information. The sun according to any one of claims 1 to 10, further comprising an attitude control unit that controls the posture of the irradiation unit so that the irradiation unit can irradiate the solar power generation panel with the inspection light substantially vertically. Inspection device for photovoltaic panels. The inspection device for a photovoltaic power generation panel according to claim 1, wherein the detection unit changes at least one of the frequency, wavelength, and irradiation range of the inspection light from the irradiation unit when the abnormal image portion cannot be detected. .. Further equipped with a temperature distribution detection unit for detecting the temperature distribution of the photovoltaic power generation panel,
When the temperature of the portion detected by the detection unit as the abnormal image portion is higher than the ambient temperature, the determination unit determines that the photovoltaic power generation panel including the abnormal image portion is not damaged. , The inspection device for a photovoltaic power generation panel according to any one of claims 1 to 12. The inspection device for a photovoltaic power generation panel according to claim 9, wherein the position measuring unit can measure the position in synchronization with the irradiation timing of the inspection light by the irradiation unit.

Images