JP7360852B2 - Floating object photography device - Google Patents

Description

The present invention relates to a floating object photographing device for photographing suspended objects in a liquid, and is used, for example, to photograph aggregated flocs in treated water.

Conventionally, as a floating object photographing device of this type, there is a photographing device 101 that photographs flocs in raw water in a flocculation pond of a water purification plant, as shown in FIG. 11, for example. This photographing device 101 has an industrial television camera 102 (ITV) housed in an airtight container 103 and submerged below the water surface 109 of raw water 104 in a flocculation pond. A transparent observation window 105 is provided in the airtight container 103, and the flocs 106 in the raw water 104 are photographed with a TV camera 102 through the observation window 105, and the size distribution, number, etc. of the flocs 106 are observed based on the photographed images. are doing.

The airtight container 103 is provided with a wiper 107 for removing dirt from the surface of the observation window 105. Further, above the observation window 105, a lamp 108 that illuminates the flock 106 is arranged. This lamp 108 is submerged below the water surface 109 of raw water 104.

Incidentally, the floating object photographing device as described above is described in, for example, Patent Document 1 listed below.

Tokuho 6-40928

However, in the conventional method described above, since the floc 106 is photographed while the airtight container 103 containing the television camera 102 is submerged below the water surface 109 of the raw water 104, dirt tends to adhere to the surface of the observation window 105, making it difficult to take accurate photographs. There is a possibility that data cannot be obtained. Therefore, it is necessary to operate the wiper 107 to frequently clean the observation window 105. However, since a cleaning means such as the wiper 107 is required, the structure of the imaging device becomes complicated, and the wiper 107 and the observation window 105 need to be cleaned. Inconveniences such as the wiper 107 being damaged or the observation window 105 being scratched due to a foreign object getting caught between the wiper 107 and the window 105 are likely to occur.

Furthermore, since the lamp 108 is used submerged under water, the lamp 108 requires a waterproof function.

An object of the present invention is to provide a floating object photographing device that has a simple structure and can obtain stable images.

In order to achieve the above object, the first invention is a floating object photographing device for photographing floating objects in a liquid, comprising:
a cylindrical member whose upper end is closed and whose lower end is open;
a photographing means capable of photographing the liquid level within the cylindrical member;
and a lighting device;
The cylindrical member consists of a light shielding body,
By immersing the lower end of the cylindrical member in the liquid to be photographed, the liquid level inside the cylindrical member is located below the liquid level outside the cylindrical member,
The illumination device is provided in the cylindrical member and is capable of irradiating the liquid level in the cylindrical member from a position above the liquid level in the cylindrical member,
The photographing means is provided at the upper part of the cylindrical member and is located above the liquid level within the cylindrical member,
The photographing center axis of the photographing means is inclined diagonally downward with respect to the liquid level within the cylindrical member.

According to this, an image of floating objects in the liquid can be obtained by photographing the liquid surface inside the cylindrical member with the photographing means. At this time, since the lower end of the cylindrical member is immersed in the liquid, even if the liquid level around the cylindrical member is wavy, these waves are blocked by hitting the cylindrical member, and the liquid level inside the cylindrical member is It is maintained in a calm state with few waves. Thereby, a stable image can be obtained.

In addition, since the photographing means is not submerged under the liquid level but is located above the liquid level in the cylindrical member, dirt in the liquid will not adhere to the photographing means, and cleaning such as cleaning the observation window can be avoided. means are no longer needed. This simplifies the structure of the floating object photographing device and suppresses the occurrence of malfunctions.

In addition, since the photographing center axis of the photographing means is tilted diagonally downward with respect to the liquid level inside the cylinder member, the reflected light generated when the illumination light from the illumination device is reflected on the liquid surface inside the cylinder member is transmitted to the photographing means. The amount of light that enters the field of view can be reduced. As a result, it is possible to reduce reflected light from being reflected in the photographed image, so that the number and size of floating objects can be accurately observed from the obtained image.

Further, since light attempting to enter the cylindrical member from the outside is blocked, it is possible to prevent adverse effects such as reflection of light from the outside on the liquid surface within the cylindrical member. Furthermore, since the lighting device does not need a waterproof function, it is possible to reduce costs.

Further, the inside of the cylindrical member is sealed with water under a positive pressure higher than atmospheric pressure, and fluctuations and ripples in the liquid level within the cylindrical member are suppressed.

In the floating object photographing device according to the third aspect of the present invention, the illumination device is provided in a cylindrical member so as to surround the photographing means.

According to this, the entire liquid surface within the cylinder member can be brightly illuminated, and an image with uniform brightness can be obtained.

In the floating object photographing device according to the fourth aspect of the present invention, the axial direction of the cylindrical member and the direction of the central photographing axis of the photographing means are parallel to each other.

In the floating object photographing device according to the fifth aspect of the present invention, the inner surface of the cylindrical member is treated to be matte.

According to this, it is possible to suppress the irradiation light from the lighting device from hitting the inner surface of the cylinder member and being reflected.

The floating object photographing device according to the sixth aspect of the present invention is provided with an elevating device capable of elevating the cylindrical member between a lowered position where the lower end is immersed in the liquid and an elevated position where the lower end is spaced above the liquid surface. It is something that

According to this, when photographing floating objects, the cylindrical member is lowered to the lowered position and the lower end of the cylindrical member is immersed in the liquid. In addition, when not photographing floating objects, the cylinder member is raised to the raised position, and the lower end of the cylinder member is spaced above the liquid level. This makes it difficult for dirt in the liquid to adhere to and accumulate on the lower end of the cylindrical member.

The floating object photographing device according to the seventh aspect of the present invention is provided with a background plate for limiting the photographing depth at a predetermined depth position below the liquid level in the cylindrical member.

According to this, since the photographing depth is limited by the background plate, if multiple floating objects in the liquid overlap vertically when viewed from the direction of inclination of the central axis of the photograph, they will be photographed as one large floating object. The frequency of storage can be significantly reduced. This makes it possible to accurately observe the number and size of floating objects from the obtained image.
The eighth invention is a floating object photographing device for photographing floating objects in a liquid,
a cylindrical member whose lower end is open;
a photographing means capable of photographing the liquid level within the cylindrical member;
and a lighting device;
The cylindrical member consists of a light shielding body,
The lower end of the cylindrical member is immersed in the liquid to be photographed,
The illumination device is provided in the cylindrical member and is capable of irradiating the liquid level in the cylindrical member from a position above the liquid level in the cylindrical member,
The photographing means is located above the liquid level in the cylinder member,
The photographing center axis of the photographing means is tilted diagonally downward with respect to the liquid level within the cylinder member,
A background plate for limiting the photographing depth is provided at a predetermined depth position below the liquid level within the cylinder member.

As described above, according to the present invention, a stable image can be obtained, and the occurrence of defects can be suppressed with a simple structure. Furthermore, since it is possible to reduce reflected light from the lighting device and reflected on the liquid surface from being reflected in the captured image, it is possible to accurately observe the number and size of floating objects from the obtained image. can do.

FIG. 1 is a diagram of a processing tank equipped with a floating object photographing device according to a first embodiment of the present invention. It is a sectional view of the floating object photographing device in the same embodiment. 3 is a view taken along the line XX in FIG. 2. FIG. It is an enlarged cross-sectional view of the floating object photographing device in the same embodiment. FIG. 3 is a sectional view of a floating object photographing device according to a second embodiment of the present invention. 6 is a view along the line XX in FIG. 5, showing a state in which the second lighting device is turned on; FIG. FIG. 2 is an enlarged cross-sectional view of the lower end of the cylindrical member of the floating object photographing device according to the first embodiment. FIG. 7 is an enlarged cross-sectional view of the lower end of the cylindrical member of the floating object photographing device according to the second embodiment. 6 is a view along the line XX in FIG. 5, showing a state in which the second lighting device is not lit (extinguished). FIG. 7 is a sectional view of a floating object photographing device according to a third embodiment of the present invention. FIG. 2 is a cross-sectional view of a conventional floating object photographing device.

Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
In the first embodiment, as shown in FIGS. 1 to 3, 1 is a treatment tank that stores sludge 2 (an example of a liquid) mixed with a flocculant and stirred in a sludge flocculation treatment system. A large number of coagulated flocs 3 (an example of suspended matter) are present in the sludge 2.

10 is a photographing device (floating object photographing device) for photographing the flocs 3 in the sludge 2. This imaging device 10 includes a circular cylindrical member 11 whose upper end is closed and whose lower end is open, and a camera 13 (an example of a photographing means) that is provided at the upper end of the cylindrical member 11 and is capable of photographing a liquid level 12 inside the cylindrical member 11. ), a first lighting device 14 (an example of a lighting device), an air supply device 16 that supplies air 15 (an example of gas) into the cylindrical member 11 from above the liquid level 12 in the cylindrical member 11, It has a device 17.

The cylindrical member 11 is made of a light shield made of metal or resin, and has a cylindrical peripheral wall portion 20 and a ceiling portion 21 provided at the upper end of the peripheral wall portion 20. Note that the inner surface of the cylindrical member 11 is matted. Further, at one location in the circumferential direction of the lower part of the peripheral wall portion 20, a ventilation hole 22 that penetrates inside and outside is formed.

The camera 13 is attached to the ceiling part 21 of the cylindrical member 11 and is located above the liquid level 12 within the cylindrical member 11. Note that an image processing device 23 is connected to the camera 13 via a cable 24.

The first illumination device 14 is an annular illumination device, and is attached to the ceiling 21 of the cylindrical member 11 so as to surround the lens portion of the camera 13, and is located above the liquid level 12 in the cylindrical member 11. The liquid level 12 inside the cylindrical member 11 is irradiated from the position. For example, an LED or the like is used as a light source of the first lighting device 14.

The air supply device 16 includes an air pump 25 and a dehumidifier 26 that dehumidifies the air 15 sent into the cylinder member 11 from the air pump 25. The air pump 25, the dehumidifier 26, and the cylindrical member 11 are connected via a pipe 27 such as a flexible hose.

The lifting device 17 raises and lowers the cylindrical member 11 between the lowered position P1 and the raised position P2. It has a moving member 31 that is movable in the vertical direction, and a drive device 32 such as a cylinder that moves the moving member 31 up and down.

Note that the cylindrical member 11 is connected to the moving member 31 via a support arm 33. Further, as shown in the imaginary line in FIG. 1 and in FIG. 2, at the lowered position P1, the lower end portion of the cylindrical member 11 and the vent hole 22 are immersed in the sludge 2 and submerged below the liquid level 35. Further, as shown by the solid line in FIG. 1, at the raised position P2, the lower end portion of the cylindrical member 11 is spaced apart above the liquid level 35.

The cylindrical member 11 is inclined at a predetermined angle with respect to the liquid level 35 of the sludge 2, so that the imaging center axis 36 of the camera 13 is tilted diagonally downward at a predetermined angle with respect to the liquid level 12 in the cylindrical member 11. It is inclined at an angle A. In this case, the central axis 51 of the cylindrical member 11 and the photographing central axis 36 are aligned.

The operation of the above configuration will be explained below.

When photographing the coagulated flocs 3 in the sludge 2 in the treatment tank 1 using the photographing device 10, while operating the air pump 25 of the air supply device 16 and supplying the air 15 into the cylinder member 11 from the air pump 25, The drive device 32 of the lifting device 17 is driven to lower the movable member 31, and the cylindrical member 11 is lowered from the raised position P2 to the lowered position P1, as shown in the imaginary line in FIG. 1 and in FIG.

As a result, the lower end portion of the cylindrical member 11 and the vent hole 22 are immersed in the sludge 2 and submerged below the liquid level 35. In this state, air 15 is continuously supplied into the cylinder member 11 from the air pump 25 and discharged from the cylinder member 11 to the outside of the cylinder member 11 through the ventilation hole 22. By turning on the first illumination device 14 and photographing the liquid level 12 inside the cylindrical member 11 with the camera 13, an image of the coagulated flocs 3 in the sludge 2 can be obtained.
At this time, since the lower end of the cylindrical member 11 is immersed in the sludge 2, even if the liquid surface 35 around the cylindrical member 11 is wavy, these waves hit the cylindrical member 11 and are blocked. Furthermore, the liquid level 12 inside the cylindrical member 11 is maintained at the same height as the vent hole 22, and is therefore located below the liquid level 35 around the cylindrical member 11. In this way, a vertical level difference occurs between the liquid level 12 inside the cylinder member 11 and the liquid level 35 around (outside) the cylinder member 11, so that the inside of the cylinder member 11 has a positive pressure higher than atmospheric pressure. Even if the liquid surface 35 around the cylindrical member 11 is undulated, the energy of the waves is difficult to propagate to the liquid surface 12 inside the cylindrical member 11 due to the presence of the step. For this reason, the liquid level 12 inside the cylindrical member 11 is maintained in a flat state with few ripples, and as a result, a stable image can be obtained, and based on the image processed by the image processing device 23, The size distribution, number, etc. of the flocs 3 can be observed accurately.

Furthermore, since the camera 13 is not submerged below the liquid levels 12 and 35 but is located above the liquid levels 12 and 35, dirt in the sludge 2 does not adhere to the camera 13 and the observation window is cleaned. This eliminates the need for other cleaning methods. This simplifies the structure of the imaging device 10 and suppresses the occurrence of malfunctions.

Further, as shown in FIG. 4, since the photographing center axis 36 of the camera 13 is tilted diagonally downward at a predetermined angle A with respect to the liquid level 12 in the cylindrical member 11, the irradiation light of the first illumination device 14 The amount of reflected light 38 generated by the light 37 being reflected by the liquid surface 12 in the cylindrical member 11 entering the field of view of the camera 13 can be reduced. Thereby, it is possible to reduce the reflected light 38 from being reflected in the photographed image, so that the number and size of the aggregated flocs 3 can be accurately observed from the obtained image.

Further, since the tube member 11 is made of an opaque light shielding body, light attempting to enter the tube member 11 from the outside is blocked, and as a result, light from the outside is reflected on the liquid surface 12 inside the tube member 11. can prevent the negative effects of Furthermore, since the inner surface of the cylindrical member 11 is matted, it is possible to suppress the irradiation light from the first lighting device 14 from hitting the inner surface of the cylindrical member 11 and being reflected.

Further, since the first lighting device 14 is located above the liquid levels 12 and 35, the first lighting device 14 does not need a waterproof function, and costs can be reduced.

Furthermore, as shown in FIG. 2, the first illumination device 14 is attached to the ceiling 21 of the cylindrical member 11 so as to surround the lens portion of the camera 13, so that the liquid level 12 inside the cylindrical member 11 is The entire area can be illuminated brightly, and images with uniform brightness can be obtained.

Further, the liquid level 12 inside the cylinder member 11 is uniformly pressed downward by the pressure of the air 15 supplied into the cylinder member 11 from the air pump 25, and this also keeps the liquid level 12 inside the cylinder member 11 flat with few ripples. can be kept in good condition.

Moreover, since the air 15 supplied into the cylinder member 11 from the air pump 25 is dehumidified by the dehumidifier 26, it is possible to prevent dew condensation on the lens of the camera 13.

In addition, as shown in FIG. 2, since the vent hole 22 is formed in the peripheral wall 20 of the cylindrical member 11, the liquid level 12 inside the cylindrical member 11 is kept at the same height as the vent hole 22, and thereby the camera 13 and Since the distance to the liquid level 12 within the cylindrical member 11 is kept constant, a clear and focused image can be obtained.

Further, after photographing the coagulated flocs 3 in the sludge 2 as described above, if the photographing device 10 is not used, the drive device 32 of the lifting device 17 is driven to raise the moving member 31, and the 1, the cylindrical member 11 is raised from the lowered position P1 to the raised position P2.

As a result, the lower end of the cylindrical member 11 is spaced apart above the liquid level 35, making it difficult for dirt in the sludge 2 to adhere to and accumulate on the lower end of the cylindrical member 11.
(Second embodiment)
In the second embodiment, as shown in FIGS. 5 and 6, a background plate 41 for limiting the photographing depth is provided at a predetermined depth position below the liquid level 12 in the cylinder member 11. ing. The background plate 41 is a semi-transparent plastic (or resin or glass) circular plate through which light can easily pass (has translucency), and is transparent through support members 42 provided at multiple locations in the circumferential direction. It is attached to the lower part of the cylindrical member 11. Note that the background plate 41 is located below the ventilation holes 22 by a predetermined distance.

Further, below the background plate 41, a second illumination device 45 is provided for erasing the shadow of the aggregated flocs 3 reflected on the background plate 41. The second lighting device 45 is attached to the inner periphery of the lower part of the cylindrical member 11, and uses, for example, a waterproof LED or the like.

The operation of the above configuration will be explained below.

By providing the background plate 41, the photographing depth is limited, and the agglomerated flocs 3 at locations deeper than the background plate 41 are not photographed by the camera 13, and only the agglomerated flocs 3 at locations shallower than the background plate 41 are captured by the camera. Photographed at 13. In this way, the agglomerated flocs 3 at locations deeper than the background plate 41 can be thinned out and photographed, so that when a plurality of agglomerated flocs 3 in the sludge 2 overlap in the vertical direction, one large agglomerated floc 3 The frequency of being photographed as such can be significantly reduced. Thereby, the number and size of the aggregated flocs 3 can be accurately observed from the obtained image.

Furthermore, it is preferable to adopt a structure in which the mounting position of the background plate 41 can be adjusted in the vertical direction, since it is possible to photograph at an optimal depth depending on the object to be photographed or the photographing conditions.

In addition, by lighting the second lighting device 45, a part of the light irradiated by the second lighting device 45 passes through the background plate 41 from below to above, so that the shadow of the agglomerated flocs 3 reflected on the top surface of the background plate 41 is reduced. will be deleted. This makes it possible to prevent the shadows of the coagulated flocs 3 reflected on the top surface of the background plate 41 from being mistaken for actual coagulated flocs 3, and to accurately determine the number and size of the coagulated flocs 3 from the obtained image. It can be observed.

To explain the above-mentioned functions and effects in a little more detail, for example, in the first embodiment described above, as shown in FIG. If they overlap vertically when viewed from 39, there is a possibility that they will be photographed as one large aggregated floc 3. On the other hand, in the second embodiment, as shown in FIG. Since the aggregated flocs 3 at locations deeper than the plate 41 can be thinned out and photographed, the number and size of the aggregated flocs 3 can be accurately observed from the obtained image.

In addition, in the second embodiment, as shown in FIG. 9, when the second lighting device 45 is not turned on, the shadow 46 of the aggregated flocs 3 is cast on the upper surface of the background plate 41 by the irradiation light from the first lighting device 14. is reflected, and there is a possibility that this shadow 46 may be mistaken for the actual coagulated floc 3. On the other hand, as shown in FIG. 6, by turning on the second illumination device 45, this shadow 46 is erased from the upper surface of the background plate 41, and the number and size of the agglomerated flocs 3 can be determined from the obtained image. It can be observed accurately.

In the second embodiment, a translucent plate is used as the background plate 41, but an opaque plate may also be used. It may also be a plate with diffuse reflectance.

In the first and second embodiments described above, as shown in FIGS. 2, 3, and 5, the annular first illumination device 14 is used to illuminate the entire inside of the cylindrical member 11. The shape is not limited to an annular shape, and may be one that emits highly straight light to pinpoint only the photographing range.

In the first and second embodiments described above, as shown in FIG. 2, the central axis 51 of the cylinder member 11 and the photographing central axis 36 coincide, 36 may be shifted in the radial direction of the cylindrical member 11 and may be in parallel directions.

In the first and second embodiments described above, as shown in FIGS. 2 and 5, the ventilation holes 22 are formed on the inclined side of the peripheral wall portion 20 in the circumferential direction. You may. For example, it may be formed at a position B2 that is shifted 180° in the circumferential direction of the peripheral wall portion 20 from the position B1 of the ventilation hole 22 shown in FIGS. 2 and 5. Alternatively, the vent hole 22 may be formed at a position B3 shifted by 90 degrees in the circumferential direction of the peripheral wall portion 20 from the position B1 of the ventilation hole 22 shown in FIGS. 2 and 5. Note that it is preferable to form the vent hole 22 at the position B3 because the distance from the camera 13 to the liquid level 12 in the tube member 11 is kept constant regardless of the inclination angle of the tube member 11.
(Third embodiment)
In the first embodiment, as shown in FIG. 2, by tilting the cylindrical member 11 at a predetermined angle with respect to the liquid level 35, the imaging central axis 36 of the camera 13 is aligned with the liquid level 12 in the cylindrical member 11. However, in the third embodiment described below, as shown in FIG. It's standing vertically.

The camera 13 is attached to the ceiling part 21 of the cylindrical member 11 at an angle, so that the imaging center axis 36 of the camera 13 is directed diagonally downward at a predetermined angle A with respect to the liquid level 12 within the cylindrical member 11. It is sloping. In this case, the central axis 51 of the cylindrical member 11 is perpendicular to the liquid level 12 within the cylindrical member 11, and the direction of the central axis 51 of the cylindrical member 11 is different from the direction of the imaging central axis 36 of the camera 13. .

Further, the first illumination device 14 is attached to the peripheral wall portion 20 of the cylindrical member 11 at an angle, so that the optical axis 52 of the first illumination device 14 is inclined with respect to the liquid level 12 inside the cylindrical member 11. It is slanted downward.

According to this, the same operation and effect as the first embodiment can be obtained. Further, by providing the background plate 41 (see FIG. 5) and the second illumination device 45 (see FIG. 5) shown in the second embodiment to the cylindrical member 11 shown in FIG. It is also possible to obtain actions and effects similar to those of the form.

In the third embodiment, both the camera 13 and the first illumination device 14 are tilted, but only one of them may be tilted.

In each of the above embodiments, the cylindrical member 11 is made of an opaque light-shielding body, but if the influence of disturbance light is small, the cylindrical member 11 may be made of a transparent or translucent member.

In each of the embodiments described above, the tube member 11 is configured to have a cylindrical shape, but it may also be configured to have a polygonal tube shape such as a quadrangle or a hexagon, or an elliptical tube shape. Furthermore, the cylindrical member 11 is not limited to being made of metal, as long as it has light blocking properties, and may be made of resin, or may be made of transparent resin or glass coated.

In each of the embodiments described above, white light is emitted from the first lighting device 14, but the color of the irradiation light 37 from the first lighting device 14 may be adjusted depending on the color of the sludge 2. In this case, it is preferable that the color of the irradiated light 37 of the first illuminating device 14 is a complementary color to the color of the sludge 2. For example, for reddish sludge 2, the irradiated light 37 of the first illuminating device 14 is set to a blue color. Alternatively, the irradiation light 37 of the first lighting device 14 may be adjusted to yellow for bluish sludge 2.

Furthermore, the irradiation light of the first illumination device 14 does not have to be visible light, and may be irradiated with infrared rays, ultraviolet rays, etc. depending on the characteristics and type of the object to be photographed. In this case, a camera 13 having sensitivity adapted to irradiation light such as infrared rays and ultraviolet rays may be used.

In each of the embodiments described above, the ventilation hole 22 is formed at one location in the circumferential direction of the lower part of the peripheral wall portion 20 of the cylindrical member 11, but it may be formed at a plurality of locations at the same level.

In each of the above embodiments, as shown in FIGS. 2, 5, and 10, the upper end of the cylindrical member 11 is closed, but the upper end of the cylindrical member 11 may be open. In this case, the liquid level 12 inside the cylindrical member 11 and the liquid level 35 around (outside) the cylindrical member 11 are at the same height.

In each of the above embodiments, the photographing device 10 is used to photograph the coagulated flocs 3 in the sludge 2. However, the photographed object is not limited to the sludge 2 and the coagulated flocs 3, and liquids other than the sludge 2 can be photographed. It may also be a suspended matter other than the coagulated flocs 3, such as suspended solids. When the object to be photographed is suspended solids, it is difficult to observe individual suspended solids like the aggregated flocs 3. Therefore, the intensity of the scattered light that is reflected by the irradiated light from the first illumination device 14 on the suspended solid surface is Alternatively, instead of the background plate 41 in the second embodiment, a marker plate used for translucency measurement may be placed immersed in the liquid inside the cylinder member 11 to determine whether the marker plate is visible or not. The turbidity of the liquid may be measured or evaluated using known methods, such as determining the turbidity of the liquid.

2 Sludge (liquid)
3 Agglomerated floc (floating matter)
10 Photographing device 11 Cylindrical member 12 Liquid level in the cylinder member 13 Camera (photographing means)
14 First lighting device (lighting device)
17 Lifting device 35 Liquid level (liquid level outside the cylinder member)
36 Photographing central axis 41 Background plate 51 Central axis P1 of the cylinder member Lowering position P2 Raising position

Claims (8)

A floating object photographing device for photographing floating objects in a liquid,
a cylindrical member whose upper end is closed and whose lower end is open;
a photographing means capable of photographing the liquid level within the cylindrical member;
and a lighting device;
The cylindrical member consists of a light shielding body,
By immersing the lower end of the cylindrical member in the liquid to be photographed, the liquid level inside the cylindrical member is located below the liquid level outside the cylindrical member,
The illumination device is provided in the cylindrical member and is capable of irradiating the liquid level in the cylindrical member from a position above the liquid level in the cylindrical member,
The photographing means is provided at the upper part of the cylindrical member and is located above the liquid level within the cylindrical member,
A floating object photographing device characterized in that a photographing center axis of a photographing means is inclined diagonally downward with respect to a liquid level within a cylindrical member. A ventilation hole that penetrates inside and outside is formed in the cylindrical member,
2. The floating object photographing device according to claim 1 , wherein the liquid level within the cylindrical member is maintained at the same height as the ventilation hole . 3. The floating object photographing device according to claim 1, wherein the illumination device is provided in a cylindrical member so as to surround the photographing means. 4. The floating object photographing device according to claim 1, wherein the axial direction of the cylindrical member and the direction of the central photographing axis of the photographing means are parallel. The floating object photographing device according to any one of claims 1 to 4, wherein the inner surface of the cylindrical member is matted. From claim 1, further comprising a lifting device capable of raising and lowering the cylindrical member between a lowered position where the lower end is immersed in the liquid and an elevated position where the lower end is spaced above the liquid level. The floating object photographing device according to claim 5. 7. The floating device according to claim 1, further comprising a background plate provided at a predetermined depth position below the liquid level in the cylindrical member for limiting the photographing depth. Object photography device. A floating object photographing device for photographing floating objects in a liquid,
a cylindrical member whose lower end is open;
a photographing means capable of photographing the liquid level within the cylindrical member;
and a lighting device;
The cylindrical member consists of a light shielding body,
The lower end of the cylindrical member is immersed in the liquid to be photographed,
The illumination device is provided in the cylindrical member and is capable of irradiating the liquid level in the cylindrical member from a position above the liquid level in the cylindrical member,
The photographing means is located above the liquid level in the cylinder member,
The photographing center axis of the photographing means is tilted diagonally downward with respect to the liquid level within the cylinder member,
A floating object photographing device characterized in that a background plate for limiting the photographing depth is provided at a predetermined depth position below the liquid level in the cylindrical member.

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