JP2020098323A - Floating material imaging device - Google Patents

Abstract

To provide a floating material imaging device which can obtain a stable image by a simple structure.SOLUTION: There is provided a floating material imaging device 10 for taking an image of a floating material 3 in a liquid 2, and the floating material imaging device includes: a cylindrical member 11 with an open lower end; imaging means 13 for imaging a liquid surface 12 in the cylindrical member 11; and an illumination device 14. The cylindrical member 11 is made of a light shielding body and the lower end of the cylindrical member 11 is immersed in the liquid 12 to be imaged. The illumination device 14 is in the cylindrical member 11 and can irradiate the liquid surface 12 in the cylindrical member 11 with light from above the liquid surface 12 in the cylindrical member 11. The imaging means 13 is located above the liquid surface 12 in the cylindrical member 11, and the axis 36 of imaging by the imaging means 13 is inclined in an obliquely downward direction with respect to the liquid surface 12 in the cylindrical member 11.SELECTED DRAWING: Figure 2

Description

The present invention relates to a floating substance photographing device for photographing a suspended substance in a liquid, and is used for photographing, for example, coagulated flocs in treated water.

Conventionally, as this type of floating object imaging apparatus, for example, as illustrated in FIG. 11, there is an imaging apparatus 101 for imaging flocs in raw water in a floc formation pond of a water purification plant. The image capturing device 101 is a device in which an industrial television camera 102 (ITV) is housed in an airtight container 103 and submerged under the water surface 109 of raw water 104 in a flock formation pond. The airtight container 103 is provided with a transparent observation window 105, and the TV camera 102 photographs the flock 106 in the raw water 104 through the observation window 105 and observes the size distribution and the number of the flock 106 based on the photographed image. doing.

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

The floating object imaging device as described above is described in, for example, Patent Document 1 below.

Japanese Patent Examination 6-40928

However, in the above-described conventional format, the flock 106 is photographed in a state in which the airtight container 103 incorporating the television camera 102 is submerged below the water surface 109 of the raw water 104, so that the surface of the observation window 105 is likely to be soiled and accurate photography is performed. There is a risk that it will not be possible to obtain data. For this reason, it is necessary to operate the wiper 107 to frequently clean the observation window 105. However, since a cleaning unit such as the wiper 107 is required, the structure of the photographing apparatus becomes complicated, and the observation with the wiper 107 is performed. Problems such as a foreign matter being caught between the window 105 and the wiper 107 being damaged or the observation window 105 being scratched are likely to occur.

Further, since the lamp 108 is used in a state of being submerged under the water surface, the lamp 108 needs a waterproof function.

It is an object of the present invention to provide a floating object photographing device that can obtain a stable image with a simple structure.

In order to achieve the above object, the first aspect of the present invention is a floating object imaging apparatus for imaging a floating object in a liquid,
A tubular member having an open lower end,
A photographing means capable of photographing the liquid level in the cylindrical member,
With a lighting device,
The tubular member consists of a light shield,
The lower end of the tubular member is immersed in the liquid to be photographed,
The illuminating device is provided in the tubular member, and is capable of irradiating the liquid surface in the tubular member from a position above the liquid surface in the tubular member,
The photographing means is located above the liquid level in the tubular member,
The photographing central axis of the photographing means is inclined obliquely downward with respect to the liquid surface in the tubular member.

According to this, the image of the floating material in the liquid can be obtained by photographing the liquid surface in the cylindrical member by the photographing means. At this time, since the lower end portion of the tubular member is immersed in the liquid, even if the liquid surface around the tubular member is wavy, this wave hits the tubular member and is blocked, and the liquid level in the tubular member is It is kept in a calm state with less ripples. Thereby, a stable image can be obtained.

Further, since the photographing means is not submerged below the liquid level and is located above the liquid level in the tubular member, dirt in the liquid does not adhere to the photographing means, and the observation window is cleaned. No means required. This simplifies the structure of the floating object imaging device and suppresses the occurrence of defects.

Further, since the center axis of photographing of the photographing means is inclined obliquely downward with respect to the liquid surface in the tubular member, the reflected light generated by the irradiation light of the illumination device being reflected on the liquid surface in the tubular member is taken by the photographing means. It is possible to reduce the amount of penetration into the field of view. As a result, it is possible to reduce reflection of reflected light on a captured image, and thus it is possible to accurately observe the number and size of floating objects from the obtained image.

Further, since the light that is about to enter the tubular member from the outside is blocked, it is possible to prevent the adverse effects such as the reflection of the external light on the liquid surface in the tubular member. Further, since the lighting device does not need a waterproof function, cost reduction can be achieved.

In the floating object photographing device according to the second aspect of the present invention, the upper end of the tubular member is closed,
The photographing means is provided on the upper part of the tubular member,
The liquid level inside the tubular member is located below the liquid level outside the tubular member.

According to this, the inside of the cylindrical member is sealed with water at a positive pressure higher than the atmospheric pressure, and fluctuations and ripples of the liquid level in the cylindrical member are suppressed.

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

According to this, the liquid surface in the tubular member can be illuminated as a whole with high brightness, and an image with uniform brightness can be obtained.

In the floating object photographing apparatus according to the fourth aspect of the present invention, the axial direction of the tubular member and the direction of the photographing central axis of the photographing means are parallel.

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

According to this, it is possible to suppress the irradiation light of the illumination device from hitting and reflecting on the inner surface of the cylindrical member.

The floating object photographing apparatus according to the sixth aspect of the present invention includes an elevating device that can elevate and lower the tubular member between a lower position where the lower end is immersed in the liquid and an upper position where the lower end is separated above the liquid surface. Is what

According to this, when photographing a floating substance, the tubular member is lowered to the lowered position, and the lower end portion of the tubular member is immersed in the liquid. Further, when the floating object is not imaged, the tubular member is raised to the raised position, and the lower end portion of the tubular member is spaced above the liquid surface. This makes it difficult for dirt in the liquid to adhere to and accumulate on the lower end of the tubular member.

The floating object photographing apparatus 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 surface in the tubular member.

According to this, since the background plate limits the imaging depth, when a plurality of floating objects in the liquid are vertically stacked when viewed from the tilt direction of the imaging center axis, they are taken as one large floating object. It is possible to significantly reduce the frequency of this. Thereby, the number and size of floating substances can be accurately observed from the obtained image.

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. In addition, it is possible to reduce the reflected light reflected from the liquid surface that is emitted from the illumination device in the captured image, so you can accurately observe the number and size of floating objects from the obtained image. can do.

It is a figure of a processing tank provided with a floating substance photography device in a 1st embodiment of the present invention. FIG. 3 is a sectional view of the floating object photographing device. It is a XX arrow line view in FIG. FIG. 3 is an enlarged cross-sectional view of the floating object photographing device. It is sectional drawing of the floating body imaging device in the 2nd Embodiment of this invention. It is a XX arrow line view in FIG. 5, and shows the state which turned on the 2nd illuminating device. It is an expanded sectional view of the lower end part of the cylinder member of the floating substance imaging device in a 1st embodiment. It is an expanded sectional view of the lower end part of the cylinder member of the floating substance imaging device in a 2nd embodiment. It is a XX arrow line view in FIG. 5, and shows the state which does not light the 2nd illuminating device (it light-extinguished). It is sectional drawing of the floating body imaging device in the 3rd Embodiment of this invention. It is sectional drawing of the conventional floating object imaging device.

Hereinafter, embodiments of the present invention will be described 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) in which a flocculant is mixed and stirred in a sludge flocculation system. A large number of flocs 3 (one example of suspended matter) are present in the sludge 2.

Reference numeral 10 denotes a photographing device (floating object photographing device) for photographing the floc 3 in the sludge 2. The photographing apparatus 10 includes a circular cylindrical member 11 having a closed upper end and an opened lower end, and a camera 13 (an example of a photographing unit) provided at the upper end of the cylindrical member 11 and capable of photographing the liquid surface 12 in 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 a gas) into the tubular member 11 from above the liquid surface 12 in the tubular member 11, And device 17.

The tubular member 11 is made of a light-shielding body made of metal or resin, and has a cylindrical peripheral wall portion 20 and a ceiling portion 21 provided at an upper end of the peripheral wall portion 20. The inner surface of the tubular member 11 is matt processed. Further, a vent hole 22 penetrating inward and outward is formed at one position in the lower portion of the peripheral wall portion 20 in the circumferential direction.

The camera 13 is attached to the ceiling portion 21 of the tubular member 11 and is located above the liquid surface 12 in the tubular member 11. An image processing device 23 is connected to the camera 13 via a cable 24.

The first illumination device 14 is an annular illumination and is attached to the ceiling portion 21 of the tubular member 11 so as to surround the lens portion of the camera 13 and is located above the liquid surface 12 in the tubular member 11. The liquid surface 12 in the tubular member 11 is irradiated from the position. An LED or the like is used as the 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 from the air pump 25 into the tubular member 11. The air pump 25, the dehumidifier 26, and the tubular member 11 are connected via a pipe 27 such as a bendable hose.

The elevating device 17 elevates and lowers the tubular member 11 between a descending position P1 and an ascending position P2, and is guided by a guide rail 30 standing on the outer surface of the processing tank 1 and supported by the guide rail 30. It has a moving member 31 that can move in the vertical direction and a drive device 32 such as a cylinder that moves the moving member 31 up and down.

The tubular member 11 is connected to the moving member 31 via a support arm 33. Further, as shown in the phantom line in FIG. 1 and in FIG. 2, at the lowered position P1, the lower end portion of the tubular member 11 and the vent hole 22 are immersed in the sludge 2 and submerged below the liquid surface 35. Further, as shown by the solid line in FIG. 1, at the raised position P2, the lower end portion of the tubular member 11 is separated above the liquid surface 35.

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

The operation of the above configuration will be described below.

When the coagulation flocs 3 in the sludge 2 in the treatment tank 1 are photographed using the photographing device 10, the air pump 25 of the air supply device 16 is operated to supply the air 15 from the air pump 25 into the tubular member 11, The driving device 32 of the elevating device 17 is driven to lower the moving member 31 and lower the tubular member 11 from the raised position P2 to the lowered position P1 as shown in the phantom line in FIG. 1 and in FIG.

As a result, the lower end portion of the tubular member 11 and the ventilation hole 22 are immersed in the sludge 2 and submerged below the liquid surface 35. In this state, the air 15 is continuously supplied from the air pump 25 into the tubular member 11 and discharged from the tubular member 11 to the outside of the tubular member 11 through the ventilation hole 22. By turning on the first illuminating device 14 and photographing the liquid surface 12 in the cylindrical member 11 with the camera 13, an image of the floc 3 in the sludge 2 can be obtained.
At this time, since the lower end of the tubular member 11 is immersed in the sludge 2, even if the liquid surface 35 around the tubular member 11 is wavy, this wave hits the tubular member 11 and is blocked. Further, since the liquid surface 12 in the tubular member 11 is kept at the same height as the vent hole 22, it is located below the liquid surface 35 around the tubular member 11. In this way, since a step in the vertical direction is generated between the liquid surface 12 inside the tubular member 11 and the liquid surface 35 around (outside) the tubular member 11, the inside of the tubular member 11 becomes a positive pressure higher than the atmospheric pressure. Even if the liquid surface 35 around the cylindrical member 11 is kept waved, the energy of this wave is less likely to propagate to the liquid surface 12 in the cylindrical member 11 due to the presence of the step. For this reason, the liquid surface 12 in the tubular member 11 is kept in a calm state with less waviness, whereby a stable image can be obtained, and aggregation is performed based on the image processed by the image processing device 23. It is possible to accurately observe the size distribution and the number of the flocs 3.

Further, since the camera 13 does not sink below the liquid surfaces 12 and 35 and is located above the liquid surfaces 12 and 35, dirt in the sludge 2 does not adhere to the camera 13 and the observation window is cleaned. No need for cleaning means. This simplifies the structure of the imaging device 10 and suppresses the occurrence of defects.

Further, as shown in FIG. 4, since the imaging center axis 36 of the camera 13 is inclined obliquely downward at a predetermined angle A with respect to the liquid surface 12 in the tubular member 11, the irradiation light of the first lighting device 14 is irradiated. It is possible to reduce the amount of reflected light 38 generated when 37 reflects off the liquid surface 12 in the tubular member 11 and enters the visual field of the camera 13. As a result, it is possible to reduce reflection of the reflected light 38 on the captured image, and thus it is possible to accurately observe the number and size of the aggregation flocs 3 from the obtained image.

Further, since the tubular member 11 is made of an opaque light-shielding body, the light that is about to enter the tubular member 11 from the outside is blocked, so that the light from the outside is reflected by the liquid surface 12 in the tubular member 11, etc. The adverse effect of can be prevented. Furthermore, since the inner surface of the tubular member 11 is matt-processed, it is possible to prevent the irradiation light of the first lighting device 14 from hitting the inner surface of the tubular member 11 and being reflected.

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

In addition, as shown in FIG. 2, since the first lighting device 14 is attached to the ceiling portion 21 of the tubular member 11 so as to surround the lens portion of the camera 13, the liquid surface 12 in the tubular member 11 is fixed. It can be illuminated brightly as a whole, and an image with uniform brightness can be obtained.

Further, the liquid surface 12 in the tubular member 11 is uniformly pressed downward by the pressure of the air 15 supplied into the tubular member 11 from the air pump 25, which also causes the liquid surface 12 in the tubular member 11 to be calm and smooth. Can be kept in good condition.

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

Further, as shown in FIG. 2, since the vent hole 22 is formed in the peripheral wall portion 20 of the tubular member 11, the liquid surface 12 in the tubular 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 surface 12 in the tubular member 11 is kept constant, a clear image in focus can be obtained.

In addition, after the coagulation flocs 3 in the sludge 2 are photographed as described above, when the photographing device 10 is not used, the driving device 32 of the lifting device 17 is driven to raise the moving member 31, As indicated by the solid line 1 in FIG. 1, the tubular member 11 is raised from the lowered position P1 to the raised position P2.

As a result, the lower end of the tubular member 11 separates above the liquid surface 35, and the dirt in the sludge 2 is unlikely to adhere to and accumulate on the lower end of the tubular 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 surface 12 in the tubular member 11. ing. The background plate 41 is a semi-transparent plastic (or resin or glass) disc through which light is easily transmitted (has a light-transmitting property), and is provided with support members 42 provided at a plurality of circumferential positions. And is attached to the lower part of the tubular member 11. The background plate 41 is located below the ventilation hole 22 by a predetermined distance.

Further, below the background plate 41, there is provided a second lighting device 45 for eliminating the shadow of the aggregation floc 3 reflected on the background plate 41. The second lighting device 45 is attached to the inner periphery of the lower portion of the tubular member 11, and uses, for example, an LED having a waterproof function.

The operation of the above configuration will be described below.

By providing the background plate 41, the photographing depth is limited so that the flocculated flocs 3 at a position deeper than the background plate 41 are not photographed by the camera 13, and only the flocculated flocs 3 at a position shallower than the background plate 41 are taken by the camera. Taken at 13. In this way, since it is possible to thin out the agglomerate flocs 3 in a portion deeper than the background plate 41 and take an image, when one or more agglomerate flocs 3 in the sludge 2 overlap in the vertical direction, one large agglomerate floc 3 is formed. It is possible to greatly reduce the frequency of being photographed as. As a result, the number and size of the aggregation flocs 3 can be accurately observed from the obtained image.

Further, if the mounting position of the background plate 41 is vertically adjustable, it is preferable because the image can be taken at an optimum depth according to the object to be imaged or the image capturing conditions.

Further, by turning on the second illuminating device 45, a part of the irradiation light of the second illuminating device 45 is transmitted through the background plate 41 from the lower side to the upper side, so that the shadow of the aggregated floc 3 reflected on the upper surface of the background plate 41 is reduced. Erased. As a result, it is possible to prevent the shadow of the agglomerate floc 3 reflected on the upper surface of the background plate 41 from being erroneously recognized as an actual agglomerate floc 3, and the number and size of the agglomerate flocs 3 can be accurately determined from the obtained image. It can be observed.

Explaining the operation and effect as described above in a little more detail, for example, in the above-described first embodiment, as shown in FIG. 7, a plurality of flocculation flocs 3 in the sludge 2 are formed in the inclination direction of the photographing central axis 36. When they are vertically overlapped with each other when viewed from 39, they may be photographed as one large aggregated floc 3. On the other hand, in the second embodiment, as shown in FIG. 8, even when a plurality of floc flocs 3 in the sludge 2 are vertically stacked when viewed from the tilt direction 39 of the photographing central axis 36, the background Since it is possible to thin out the agglomerate flocs 3 at a position deeper than the plate 41 and photograph them, the number and size of the agglomerate 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 floc 3 is condensed on the upper surface of the background plate 41 by the irradiation light from the first lighting device 14. May be mistaken for the agglomerated flocs 3 that actually exist. On the other hand, as shown in FIG. 6, by turning on the second illumination device 45, the shadow 46 is erased from the upper surface of the background plate 41, and the number and size of the aggregation flocs 3 are determined from the obtained image. It can be observed accurately.

In the second embodiment described above, a semi-transparent plate is used as the background plate 41, but an opaque plate may be used, and a low reflectance or a high reflectance may be used to reduce the influence of the irradiation light from above. It may be a plate having a diffuse reflectance.

In the first and second embodiments described above, as shown in FIGS. 2, 3 and 5, the inside of the tubular member 11 is wholly illuminated by using the annular first illuminating device 14. The present invention is not limited to the annular shape, and may be one that illuminates only the shooting range by pinpointing by irradiating light that has a strong straight-line property.

In the first and second embodiments described above, as shown in FIG. 2, the central axis 51 of the tubular member 11 and the shooting central axis 36 coincide, but the central axis 51 of the tubular member 11 and the shooting central axis 36. 36 and 36 may be offset in the radial direction of the tubular member 11 and parallel to each other.

In the first and second embodiments, as shown in FIGS. 2 and 5, the ventilation hole 22 is formed on the inclined side in the circumferential direction of the peripheral wall portion 20, but at any position in the circumferential direction. You may. For example, it may be formed at a position B2 which is shifted 180° to the opposite side in the circumferential direction of the peripheral wall portion 20 from the position B1 of the ventilation hole 22 shown in FIGS. Alternatively, it may be formed at a position B3 which is deviated from the position B1 of the vent hole 22 shown in FIGS. 2 and 5 by 90° in the circumferential direction of the peripheral wall portion 20. In addition, when the vent hole 22 is formed at the position B3, the distance from the camera 13 to the liquid surface 12 in the tubular member 11 is kept constant regardless of the inclination angle of the tubular member 11, which is preferable.
(Third Embodiment)
In the first embodiment, as shown in FIG. 2, by tilting the tubular member 11 at a predetermined angle with respect to the liquid surface 35, the photographing central axis 36 of the camera 13 is aligned with the liquid surface 12 in the tubular member 11. On the other hand, although it is inclined obliquely downward at a predetermined angle A, in the third embodiment described below, as shown in FIG. 10, the cylindrical member 11 is inclined with respect to the liquid surface 35. Instead, it stands vertically.

The camera 13 is attached to the ceiling portion 21 of the tubular member 11 so as to be inclined, whereby the photographing center axis 36 of the camera 13 is inclined obliquely downward with respect to the liquid surface 12 in the tubular member 11 at a predetermined angle A. Is inclined at. In this case, the central axis 51 of the tubular member 11 is perpendicular to the liquid surface 12 in the tubular member 11, and the direction of the central axis 51 of the tubular member 11 and the direction of the photographing central axis 36 of the camera 13 are different. ..

Further, the first lighting device 14 is attached to the peripheral wall portion 20 of the tubular member 11 in an inclined manner, whereby the optical axis 52 of the first lighting device 14 is oblique to the liquid surface 12 in the tubular member 11. Inclined downward.

According to this, the same operation and effect as those of the first embodiment can be obtained. Further, by providing the tubular member 11 shown in FIG. 10 with the background plate 41 (see FIG. 5) and the second illumination device 45 (see FIG. 5) shown in the second embodiment, the second embodiment can be realized. It is also possible to obtain the same action and effect as the form.

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

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

In each of the above-mentioned embodiments, the tubular member 11 is formed in a cylindrical shape, but it may be formed in a polygonal tubular shape such as a quadrangle or a hexagon, or an elliptic tubular shape. Further, the cylindrical member 11 is not limited to a metal as long as it has a light-shielding property, and may be a resin, or a resin or a transparent resin coated with glass.

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

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

In each of the above-described embodiments, the ventilation hole 22 is formed at one location in the lower portion of the peripheral wall portion 20 of the tubular member 11 in the circumferential direction, 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 tubular member 11 is closed, but the upper end of the tubular member 11 may be open. In this case, the liquid level 12 inside the tubular member 11 and the liquid level 35 around (outside) the tubular member 11 have the same height.

In each of the above-described embodiments, the flocculation floc 3 in the sludge 2 is photographed using the photographing device 10, but the photographing target is not limited to the sludge 2 and the flocculation floc 3, and liquids other than the sludge 2 may be photographed. Alternatively, it may be a suspended matter other than the flocculating flocs 3, such as suspended matter. When the object to be imaged is turbid, it is difficult to individually observe the floating substances like the flocculation flocs 3, so the intensity of the scattered light reflected from the turbid surface by the irradiation light from the first lighting device 14 Is measured, or instead of the background plate 41 in the second embodiment, a marker plate used in the measurement of the transparency is immersed in the liquid in the tubular member 11 and disposed, so that the marker plate can be visually recognized. For example, the turbidity of the liquid may be measured or evaluated by a known method such as determining.

2 Sludge (liquid)
3 floc flocs (floating matter)
10 Imaging Device 11 Cylindrical Member 12 Liquid Level in Cylindrical Member 13 Camera (imaging means)
14 First lighting device (lighting device)
17 Lifting device 35 Liquid level (liquid level outside the tubular member)
36 Shooting central axis 41 Background plate 51 Central axis P1 of cylinder member Lower position P2 Upper position

Claims (7)

A floating object photographing device for photographing a floating object in a liquid,
A tubular member having an open lower end,
A photographing means capable of photographing the liquid level in the cylindrical member,
With a lighting device,
The tubular member consists of a light shield,
The lower end of the tubular member is immersed in the liquid to be photographed,
The illuminating device is provided in the tubular member, and is capable of irradiating the liquid surface in the tubular member from a position above the liquid surface in the tubular member,
The photographing means is located above the liquid level in the tubular member,
A floating object photographing apparatus, wherein a photographing central axis of the photographing means is inclined obliquely downward with respect to the liquid surface in the cylindrical member. The upper end of the tubular member is closed,
The photographing means is provided on the upper part of the tubular member,
The floating object imaging apparatus according to claim 1, wherein the liquid level inside the tubular member is located below the liquid level outside the tubular member. The floating object photographing device according to claim 1 or 2, wherein the illuminating device is provided in the cylindrical member so as to surround the photographing means. The floating object photographing device according to any one of claims 1 to 3, wherein the axial direction of the cylindrical member and the direction of the photographing central axis of the photographing means are parallel to each other. The floating object photographing device according to any one of claims 1 to 4, wherein an inner surface of the cylindrical member is matt processed. 2. An elevating device capable of elevating and lowering a tubular member between a lowered position in which the lower end is immersed in the liquid and an elevated position in which the lower end is separated above the liquid surface. The floating object imaging device according to claim 5. The background plate for limiting the imaging depth is provided at a predetermined depth position below the liquid surface in the tubular member, and the floating according to any one of claims 1 to 6. Object photography device.

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