JP2004356020A - Interior illuminator or interior observation system of storage tank equipped with illuminator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small and lightweight interior illuminator of a storage tank and an interior observation system of the storage tank equipped with the illuminator relating to the interior illuminator of the storage tank which is used for observing the interior of the storage tank and the interior observation system of the storage tank equipped with the illuminator. <P>SOLUTION: The interior illuminator of the storage tank for illuminating the interior of the storage tank comprises an illuminating section 52 having an approximately cylindrical outer shape equipped bar-like lamps 36 for the side and reflecting plates 40 for reflecting light from the lamps 36 for the side in a prescribed direction, and a pan rotating mechanism 50 for rotating the illuminating section 52 using the cylinder axis of the illuminating section 52 as the axis of rotation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a storage tank interior illumination device used when observing the inside of a storage tank, and a storage tank interior observation system including the same.
[0002]
[Prior art]
Low-temperature storage tanks (LNG storage tanks) for storing liquefied natural gas (LNG: Liquid Natural Gas) include a ground-based storage tank (LNG ground storage tank) and an underground storage tank (LNG underground storage tank).
[0003]
Non-Patent Document 1 describes an LNG underground storage tank internal observation system for observing the inside of an LNG underground storage tank. FIG. 5 shows a configuration of a conventional LNG underground storage tank internal observation system described in Non-Patent Document 1. As shown in FIG. 5, a conventional LNG underground storage tank internal observation system 150 includes an illumination device 140 for illuminating the inside of the LNG underground storage tank 109, an imaging device 142 for imaging the inside of the LNG underground storage tank 109, and a lighting device 140. And a control device 102 for controlling the imaging device 142. The lighting device 140 and the imaging device 142 have different housings, respectively. The control device 102 includes a control unit that controls the lighting device 140 and the imaging device 142, and a display unit that displays information such as an image from the imaging device 142. In addition, the LNG underground storage tank internal observation system 150 has a cable storage table 148 a that stores the cable 144 connected to the lighting device 140 and a cable storage table 148 b that stores the cable 146 connected to the imaging device 142. ing. The control device 102 and the cable storage tables 148a and 148b are installed outside the LNG underground storage tank 109.
[0004]
The lighting device 140 is inserted into the LNG underground storage tank 109 from the nozzle 112a, and is suspended by the cable 144. The lighting device 140 has a side lamp and a lower lamp (both not shown). For each lamp, an omnidirectional irradiation type having a rod shape and capable of irradiating light in all directions around the lamp is used. Further, the imaging device 142 is inserted into the LNG underground storage tank 109 from another nozzle 112 b and is suspended by the cable 146.
[0005]
The imaging device 142 has an imaging unit that is rotated by a pan rotation mechanism (not shown) with a cylindrical axis as a rotation axis. The imaging unit includes a camera, a lens, and the like mounted downward. A side-view head having a tiltable side-view mirror and a tilt mechanism for tilting the side-view mirror is attached to the imaging unit. When observing the bottom inside the LNG underground storage tank 109, the side view head is removed, and when observing the side inside the LNG underground storage tank 109, the side view head is attached.
[0006]
In the LNG underground storage tank interior observation system 150, since the illumination device 140 and the imaging device 142 have separate housings, the devices 140 and 142 are relatively small and lightweight. Therefore, there is little restriction on the diameter of the nozzle, and the nozzle can be used for many underground storage tanks. Since only the illumination device 140 and the imaging device 142 are attached to the roof of the LNG underground storage tank 109, the installation and removal of the LNG underground storage tank internal observation system 150 can be performed manually.
[0007]
For such an LNG underground storage tank internal observation system 150, Non-Patent Document 2 describes an LNG ground-based storage tank internal observation system that observes the inside of an LNG ground storage tank. FIG. 6 shows a configuration of a conventional LNG ground-based storage tank internal observation system described in Non-Patent Document 2. As shown in FIG. 6, the conventional LNG ground-based storage tank internal observation system includes an observation device 104, a cable drum device 106, and a control device 102. The observation device 104 is inserted from the nozzle 112 into the LNG ground storage tank 110 during observation, and is suspended by the cable 108.
[0008]
FIG. 7 shows a schematic configuration of the observation device 104. As illustrated in FIG. 7, the observation device 104 includes an imaging unit 120 including a camera, a lens, and the like, and an illumination unit 124 including a plurality of lamps 122 that illuminate the vicinity of a region to be imaged by the imaging unit 120. I have. Each of the lamps 122 has a bombshell-shaped reflector, and irradiates light only in a predetermined direction.
[0009]
The observation device 104 has a substantially cylindrical outer shape. When observing the side surface of the LNG terrestrial storage tank 110, the imaging unit 120 at the tip of the observation device 104 is tilted (tilted) in the double arrow X direction by the tilt mechanism unit 130. The imaging unit 120 and the illumination unit 124 are rotatably attached to the housing upper part 126. A pan rotation mechanism unit 128 that rotates (pan rotation) the imaging unit 120 and the illumination unit 124 in a double-headed Y direction in a horizontal plane is provided on the housing upper part 126.
[0010]
The cable drum device 106 is mounted on a nozzle 112 provided on the roof of the LNG ground storage tank 110. The cable drum device 106 winds or sends out the cable 108 by rotating the cable drum 107 by a drum driving unit (not shown). Thus, the vertical position of the observation device 104 connected to the distal end of the cable 108 and suspended in the LNG ground-type storage tank 110 can be adjusted.
[0011]
The control device 102 includes a control unit that controls the cable drum device 106 and the observation device 104, and a display unit that displays information from the observation device 104. The control device 102 is installed outside the LNG ground storage tank 110.
[0012]
The observation device unit in which the observation device 104, the cable drum device 106, and a cover that covers them are integrated is attached to the nozzle 112 on the roof of the LNG ground storage tank 110. By controlling the pan rotation angle, the inclination angle of the imaging unit 120, the vertical position of the observation device 104, and the like from the control device 102, observation of each part in the LNG ground storage tank 110 is performed.
[0013]
[Non-patent document 1]
Hiroyuki Ishiyama and 2 others, "Practical use of small and light LNG tank submerged observation device", Piping Technology, Nippon Kogyo Shuppan, April 2001, Vol. 43, No. 5, p. 16-20
[Non-patent document 2]
Fumi Naganuma, "LNG storage tank interior observation device", Piping technology, Nippon Kogyo Shuppan, April 2001, Vol. 43, No. 5, p. 21-25
[0014]
[Problems to be solved by the invention]
By the way, the side surface and the bottom surface in the LNG underground storage tank 109 are made of stainless steel having high light reflectance, whereas the side surface and the bottom surface in the LNG ground storage tank 110 are generally made of 9% nickel (Ni) steel. , And rust-proof coating. Therefore, the side surface and the bottom surface in the LNG underground storage tank 110 have a lower light reflectance than the side surface and the bottom surface in the LNG underground storage tank 109. Therefore, in order to observe the inside of the LNG underground storage tank 110, it is necessary to illuminate with higher illuminance than to observe the inside of the LNG underground storage tank 109. However, since the illumination device 140 of the LNG underground storage tank internal observation system 150 of Non-Patent Document 1 shown in FIG. 5 cannot provide sufficient light emission luminance, the observation system 150 is used as it is to observe the inside of the LNG ground storage tank 110. It is extremely difficult to do. If the emission luminance of each lamp of the lighting device 140 is increased, the inside of the LNG ground-type storage tank 110 can be illuminated with higher illuminance, but a new problem that the lighting device 140 becomes large arises. This not only makes it difficult to install and remove the storage tank interior observation system 150, but also increases the diameter of the nozzle required to insert the illumination device 140.
[0015]
By using the observation device 104 of Non-Patent Document 2 shown in FIGS. 6 and 7, it is possible to illuminate the observation region in the LNG ground storage tank 110 with sufficient illuminance. However, the observation device 104 has a large housing size because the imaging unit 120 and the illumination unit 124 are stored in the same housing. In order to insert the observation device 104 into the LNG ground-type storage tank 110, the LNG ground-type storage tank 110 needs to have a large-diameter nozzle (8B (8 inches８203 mm) or more as a gate valve nozzle).
[0016]
In addition, since a complete observation device unit having a mass of about 1 t is installed on the roof of the LNG ground storage tank 110, it is necessary to check the strength of the roof in advance. Depending on the LNG terrestrial storage tank 110, it may not be possible to install the observation device unit and the interior may not be observed. Even if it can be installed, the work of attaching the heavy observation device unit to the nozzle 112 on the roof is a major work requiring a large-scale scaffold, a large crane, and the like. For this reason, high observation costs and long study periods are required. This is a high-risk operation that requires careful attention and sufficient safety measures.
[0017]
Further, when observing the side surface in the LNG terrestrial storage tank 110, the imaging unit 120 is tilted in the LNG terrestrial storage tank 110, and the observation device 104 is bent. Therefore, if the observation device 104 does not return to the cylindrical shape while being bent due to a failure or the like, there is a possibility that the observation device 104 may not be able to be taken out of the LNG ground storage tank 110.
[0018]
An object of the present invention is to provide a small and light storage tank interior illumination device and a storage tank interior observation system including the same.
[0019]
[Means for Solving the Problems]
The above object is a storage tank internal lighting device for illuminating the inside of a storage tank, which has a lighting unit including a rod-shaped light source and a reflector that reflects light from the light source in a predetermined direction. Achieved by internal lighting devices.
[0020]
In the storage tank interior lighting device according to the present invention, the lighting unit has a substantially cylindrical outer shape. The above-described storage tank interior lighting device of the present invention is characterized by further comprising a rotation mechanism for rotating the lighting unit.
[0021]
In the storage tank interior lighting device according to the present invention, the reflection plate extends substantially parallel to the central axis of the light source, and has a parabolic cross-sectional shape whose focal point is the central axis of the light source. In the above-described illumination device inside a storage tank of the present invention, the light source is arranged at a position shifted from a central axis of the illumination unit. Further, the storage tank is a ground-type low-temperature storage tank.
[0022]
Further, the object is to provide an imaging device for imaging a predetermined region inside a storage tank, an illumination device for illuminating the predetermined region, and a storage device inside observation system having a control device for controlling the imaging device and the illumination device. The present invention is attained by a storage tank interior observation system, wherein the storage device interior illumination device of the present invention is used for the illumination device.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
A storage tank interior illumination device and a storage tank interior observation system including the same according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a schematic configuration of a storage tank interior observation system according to the present embodiment. As shown in FIG. 1, the LNG storage tank internal observation system 30 includes an illumination device 22 that illuminates the inside of the LNG terrestrial storage tank 10, an imaging device 24 that captures an image of the inside of the LNG terrestrial storage tank 10, the illumination device 22 and the imaging device 24 And a control device 20 for controlling the The control device 20 includes a control unit that controls the lighting device 22 and the imaging device 24, and a display unit that displays information such as an image from the imaging device 24. Further, the LNG storage tank internal observation system 30 includes a cable storage table 26a that stores the cable 32 connected to the lighting device 22 and a cable storage table 26b that stores the cable 34 connected to the imaging device 24. . The control device 20 and the cable storage stands 26a and 26b are installed outside the LNG ground storage tank 10.
[0024]
The lighting device 22 is inserted into the LNG terrestrial storage tank 10 from a nozzle 12 a provided on the roof of the LNG terrestrial storage tank 10, and is suspended by a cable 32. The imaging device 24 is inserted into the LNG terrestrial storage tank 10 from another nozzle 12 b provided on the roof of the LNG terrestrial storage tank 10, and is suspended by the cable 34. The illumination device 22 and the imaging device 24 have, for example, a substantially cylindrical outer shape so that insertion and removal with the nozzles 12a and 12b are easy. The illumination device 22 and the imaging device 24 may be inserted into the LNG ground storage tank 10 from the same nozzle.
[0025]
The cables 32 and 34 include, for example, a suspending wire for suspending each of the devices 22 and 24, a power supply conductor for supplying power to each of the devices 22 and 24, and a cable between each of the devices 22 and 24 and the control device 20. This is a composite cable in which signal transmission conductors and the like for transmitting signals transmitted and received by the above are integrated.
[0026]
FIG. 2 shows a cross-sectional configuration of the storage tank internal lighting device according to the present embodiment, which is cut in a cylindrical axis direction. As shown in FIG. 2, the lighting device 22 has a lighting unit 52 having a substantially cylindrical outer shape on a distal end side. The lighting unit 52 has three side lamp units 36 and one lower lamp unit 38 arranged in the cylindrical axis direction of the lighting device 22. The adjacent side lamp unit 36 and lower lamp unit 38 are fixed to each other with bolts or the like.
[0027]
The side lamp units 36 are disposed to face each other, and have two disk-shaped base portions 80 and 81 that are substantially perpendicular to the cylindrical axis of the lighting device 22. The base portions 80 and 81 are fixed to each other by, for example, a plurality of linear frames (not shown). Each linear frame is arranged at a predetermined interval on the outer peripheral portion of the side lamp unit 36 and extends in the cylindrical axis direction of the lighting device 22. The outer periphery of the linear frame is further covered with a stainless steel mesh 76 for preventing debris, parts and the like when the lamps 84 and 86 are damaged from falling into the LNG ground storage tank 10.
[0028]
A socket portion 82 connected to the power supply conductor 90 is attached to one base portion 80. An omnidirectional irradiation type rod-shaped side lamp 84 is detachably connected to the socket portion 82. The central axis of the rod-shaped side lamp 84 is arranged substantially parallel to the cylindrical axis of the lighting device 22. As the side lamp 84, a small-sized, high-output halogen lamp for low temperature can be used even in very low temperature LNG. A reflector 40 extending substantially parallel to the central axis of the side lamp 84 is provided inside the outer peripheral portion of the side lamp unit 36 and near the side lamp 84. One end of the reflection plate 40 is fixed to the base 80, and the other end is fixed to the base 81.
[0029]
FIG. 3 is a cross-sectional view of the side lamp unit 36 cut perpendicularly to the cylindrical axis, and shows an arrangement of the side lamp 84 and the reflector 40. As shown in FIG. 3, the side lamp 84 is disposed at a position shifted rightward in the figure from a cylindrical axis (center axis) a of the lighting device 22. The reflection plate 40 is disposed on the left side of the side lamp 84 in the drawing. The reflector 40 has a parabolic cross-sectional shape whose focal point is the central axis of the side lamp 84. Thus, when viewed in the direction of the cylindrical axis of the illumination device 22, the light incident on the reflector 40 from the side lamp 84 is reflected as substantially parallel light to the right in the drawing. Therefore, the side surface in the LNG ground storage tank 10 in the illumination direction indicated by the thick arrow in the drawing is illuminated with high light intensity, and the illuminance required for observation is secured. When the light directly incident on the reflector 40 from the side lamp 84 and reflected directly returns to the side lamp 84, the side lamp 84 may be damaged or deteriorated due to overheating. To prevent this, a slit-shaped opening 42 (shown by a broken line in FIG. 3) extending in the cylindrical axis direction of the illumination device 22 is formed at the bottom of the parabolic section of the reflection plate 40.
[0030]
Returning to FIG. 2, the lower lamp unit 38 has a base portion 83 and a socket portion 82 attached to the base portion 83 and connected to the power supply conductor 90. An omnidirectional irradiation type rod-shaped lower lamp 86 is detachably connected to the socket portion 82. The rod-shaped lower lamp 86 is disposed, for example, on the cylindrical axis of the lighting device 22. As the lower lamp 86, a low-temperature halogen lamp is used as in the case of the side lamp 84.
[0031]
The illumination device 22 has a pan rotation mechanism 50 that rotates the illumination unit 52 in the direction of the double arrow A with the cylindrical axis of the illumination device 22 as a rotation axis. The pan rotation mechanism unit 50 includes a drive unit 46 having a motor and a speed reducer, and a bearing unit 44. The pan rotation mechanism unit 50 rotates the illumination unit 52 in a predetermined rotation direction based on a control signal from the control device 20 shown in FIG. Is rotated by a predetermined rotation angle. The rotation of the illumination unit 52 changes the illumination direction, so that all directions of the side surface in the LNG ground storage tank 10 can be illuminated. The vertical position of the lighting device 22 can be easily adjusted by human power.
[0032]
FIG. 4 shows a configuration of the imaging device 24 of the LNG storage tank internal observation system 30. As shown in FIG. 4, the imaging device 24 includes a pan rotation mechanism 60 similar to the pan rotation mechanism 50 of the lighting device 22, and a double arrow B using the pan rotation mechanism 60 with the cylindrical axis of the imaging device 24 as the rotation axis. And an imaging unit 62 that rotates in the direction. The imaging unit 62 has a CCD camera 66 and an optical zoom lens 68 stored in a vacuum insulated container 70. The CCD camera 66 and the optical zoom lens 68 are attached downward so as to capture an image of the bottom surface of the LNG ground storage tank 10 via the observation window 72. On the observation window 72 side of the imaging unit 62, a side-viewing head unit 64 for imaging the side surface of the LNG terrestrial storage tank 10 is detachably attached.
[0033]
The side-view head unit 64 includes a side-view mirror 74 that can be tilted in the double-headed arrow C direction, and a tilt mechanism (not shown). The tilt mechanism tilts the side-view mirror 74 by a predetermined tilt angle based on a control signal from the control device 20. The image pickup device 24 can pick up an image of each part on the side surface of the LNG terrestrial storage tank 10 by the pan rotation of the image pickup section 62 and the tilt operation of the side-view mirror 74. The vertical position of the imaging device 24 can be easily adjusted by, for example, human power.
[0034]
Next, a method of observing the inside of the LNG ground-based storage tank 10 using the storage tank interior lighting device 22 and the storage interior observation system 30 including the same according to the present embodiment will be described again with reference to FIG. 1. First, the control device 20 and the cable storage stands 26a and 26b are installed near the LNG ground storage tank 10 for observing the inside. Next, while pulling out the cables 32 and 34 stored in the cable storage stands 26a and 26b, respectively, the lighting device 22 and the imaging device 24 are lifted on the roof of the LNG terrestrial storage tank 10 by, for example, human power. Subsequently, the lighting device 22 is inserted from the nozzle 12a and suspended in the LNG terrestrial storage tank 10 by the cable 32, and the imaging device 24 is inserted from the nozzle 12b into the LNG terrestrial storage tank 10 and the LNG terrestrial storage tank is connected by the cable 34. Hang it in 10.
[0035]
Next, the illumination direction of the illumination device 22 and the imaging direction of the imaging device 24 are adjusted by the control device 20, and an image of the side surface (or the bottom surface or the upper surface) in the LNG terrestrial storage tank 10 is displayed on the display unit of the control device 20. . If necessary, the positions of the illumination device 22 and the imaging device 24 in the vertical direction are manually adjusted.
[0036]
When the observation is completed, the illumination device 22 and the imaging device 24 are manually pulled up and pulled out from the nozzles 12a and 12b. Thereafter, the lighting device 22 and the imaging device 24 are manually lowered from the roof of the LNG terrestrial storage tank 10, and the cables 32 and 34 are stored in the cable storage tables 26a and 26b, respectively.
[0037]
In the present embodiment, the lighting device 22 and the imaging device 24 have different housings. Further, by providing the reflecting plate 40 in the lighting device 22, the side surface in the LNG ground storage tank 10 can be illuminated with high illuminance without increasing the light emission luminance of the lamp. For this reason, the illumination device 22 and the imaging device 24 can be made relatively small and lightweight (both 20 kg or less). Further, the cable storage stands 26 a and 26 b and the control device 20 are installed on the ground outside the LNG ground storage tank 10. The lighting device 22, the imaging device 24, and the pulleys for suspending the devices 22, 24 are merely attached to the roof of the LNG ground storage tank 10. For this reason, a series of operations from setting of the LNG storage tank internal observation system 30 to observation and removal can be performed only by human power. Therefore, the cost required for observation can be significantly reduced, and the risk of work is low, so that the inside of the LNG ground-type storage tank 10 can be observed in a short time.
[0038]
In addition, in this embodiment, since the diameter of the nozzle required for insertion is small, for example, 5B (5 inchesｍｍ127 mm), and the device mounted on the roof is lightweight, almost all LNG ground storage tanks are used. You can observe inside. Furthermore, even when observing the side surface inside the LNG terrestrial storage tank 10, the imaging device 24 maintains the substantially cylindrical outer shape without bending, so that there is no possibility that the imaging device 24 cannot be removed from the LNG terrestrial storage tank 10.
[0039]
In the present embodiment, since the cable storage stands 26a and 26b are installed on the ground, the required length of the cables 32 and 34 is increased. However, the portion of the cables 32 and 34 used for routing outside the LNG ground storage tank 10 is kept at a relatively inexpensive room temperature specification to suppress an increase in cost.
[0040]
The present invention is not limited to the above embodiment, and various modifications are possible.
For example, in the above embodiment, the pan rotation mechanism unit 50 rotates the entire lighting unit 52, but the present invention is not limited to this. The side lamp 84 may be arranged on the cylindrical axis of the lighting device 22, and the pan rotation mechanism 50 may rotate only the reflection plate 40.
[0041]
In the above embodiment, the reflector 40 has a parabolic cross-sectional shape whose focal point is the center axis of the side lamp 84, but the present invention is not limited to this. The reflection plate 40 may have a cross-sectional shape such as a partial ellipse, a partial circle, a “C” shape, and a “C” shape.
[0042]
Furthermore, in the above embodiment, the lighting device 22 has a substantially cylindrical outer shape, but the present invention is not limited to this. The lighting device 22 may have a polygonal tubular shape such as a triangular tubular shape or a square tubular shape, or an external shape of another shape.
[0043]
In the above-described embodiment, an example in which the LNG storage tank internal observation system 30 is applied to the LNG terrestrial storage tank 10 has been described. However, the present invention is not limited to this, and the LNG underground storage tank or liquefied petroleum gas (LPG; The present invention can be applied to other storage tanks such as a gas storage tank.
[0044]
【The invention's effect】
As described above, according to the present invention, a compact and lightweight storage tank interior illumination device and a storage tank interior observation system including the same can be realized.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a storage tank interior observation system according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a configuration of a storage tank internal lighting device according to one embodiment of the present invention.
FIG. 3 is a cross-sectional view illustrating a configuration of a storage tank internal lighting device according to an embodiment of the present invention.
FIG. 4 is a diagram showing a configuration of an imaging device of the storage tank internal observation system according to one embodiment of the present invention.
FIG. 5 is a diagram showing a configuration of a conventional LNG underground storage tank internal observation system.
FIG. 6 is a diagram showing a configuration of a conventional LNG ground-based storage tank internal observation system.
FIG. 7 is a diagram showing the configuration of a conventional LNG ground-based storage tank interior observation device.
[Explanation of symbols]
10 LNG ground-type storage tanks 12a, 12b Nozzle 20 Control device 22 Illumination device 24 Imaging device 26a, 26b Cable storage base 30 LNG storage tank internal observation system 32, 34 Cable 36 Side lamp unit 38 Lower lamp unit 40 Reflector 42 Opening Unit 44 bearing unit 46 driving unit 50, 60 pan rotation mechanism unit 52 illumination unit 62 imaging unit 64 side-view head unit 66 CCD camera 68 optical zoom lens 70 vacuum insulation container 72 observation window 74 side-view mirror 76 mesh 80, 81 base unit 82 Socket part 84 Side lamp 86 Down lamp 90 Power supply conductor

Claims (7)

A storage tank interior lighting device for illuminating the inside of the storage tank,
An illumination device inside a storage tank, comprising: an illumination unit including a rod-shaped light source and a reflection plate that reflects light from the light source in a predetermined direction. The storage tank internal lighting device according to claim 1,
The illuminating unit has a substantially cylindrical outer shape. The storage tank internal lighting device according to claim 1 or 2,
A storage tank interior lighting device, further comprising a rotation mechanism for rotating the lighting unit. The storage tank interior lighting device according to any one of claims 1 to 3,
The internal reflector of the storage tank, wherein the reflector extends substantially parallel to a central axis of the light source and has a parabolic cross-sectional shape whose focal point is the central axis of the light source. The storage tank internal lighting device according to claim 4,
The lighting device inside a storage tank, wherein the light source is disposed at a position shifted from a central axis of the lighting unit. The storage tank interior lighting device according to any one of claims 1 to 5,
The storage tank internal lighting device, wherein the storage tank is a ground-type low-temperature storage tank. An imaging device for imaging a predetermined region inside the storage tank, an illumination device for illuminating the predetermined region, and a storage device inside observation system having a control device for controlling the imaging device and the illumination device,
A storage tank interior observation system, wherein the storage tank interior illumination device according to any one of claims 1 to 6 is used as the illumination device.

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