Floating object observation device

Abstract

To provide a floating matter observation device with which it is possible to both increase a restitutive force and lower the center of gravity.SOLUTION: Provided is a floating matter observation device 11 that observes a floating matter 4 in the liquid 2 being observed while floating on a liquid surface 5 of the liquid 2 being observed, said device comprising: a pair of floats 12, 13 facing each other in a second direction 6 that intersects the liquid 2 being observed that flows in a first direction; and an imaging device 14 that is supported to the floats 12, 13 and captures an image of the floating matter 4 beneath the liquid surface 5 from above the liquid surface. The floats 12, 13 include a first float part 21 that intersects the liquid surface 5 and a second float part 22 that extends downward from the first float part 21 and submerged below the liquid surface. The horizontal sectional area of the first float part 21 is set to be wider than the horizontal sectional area of the second float part 22, and the liquid 2 being observed flows in the first direction between the pair of floats 12, 13.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a suspended matter observation device that observes suspended matter in an observation target liquid while floating on the liquid surface of the observation target liquid.

Background Art

[0002] Conventionally, as a suspended matter observation device of this type, for example, as described in Patent Document 1 below, there is one that observes flocs in water while floating on the water surface in a treatment water tank of a water purification plant. This suspended matter observation device has a light-shielding hood with an open lower end, a camera provided in the light-shielding hood, a lighting provided in the light-shielding hood, and a floating body provided on the light-shielding hood. The floating body has a rectangular cross-sectional shape.

[0003] The light-shielding hood and the wall surface of the treatment water tank are connected via a link mechanism, and the suspended matter observation device can swing up and down following the vertical movement of the water surface while being connected to the wall surface of the treatment water tank via the link mechanism.

[0004] According to this, the suspended matter observation device floats on the water surface by the buoyancy of the floating body. In this state, the light of the lighting is irradiated onto the water surface in the light-shielding hood, and the water surface in the light-shielding hood is photographed by the camera to observe the flocs in the water.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the conventional design described above, when the floating object observation device moves up and down in response to fluctuations in the water level, the connection between the link mechanism and the light-shielding hood slides against each other. If the water level rises beyond expectations and the sliding part of the connection between the link mechanism and the light-shielding hood is submerged, flocks or other debris may get caught in the sliding part of the connection between the link mechanism and the light-shielding hood, causing the link mechanism to malfunction and potentially making it impossible to maintain a constant distance from the camera to the water surface. To prevent such malfunctions, the connection between the link mechanism and the light-shielding hood needs to be maintained periodically.

[0007] As described above, conventional floating object observation devices use a link mechanism to maintain their orientation. However, the present invention aims to provide a floating object observation device that can maintain its orientation without using a link mechanism, thereby achieving both increased restoring force and a lowered center of gravity. [Means for solving the problem]

[0008] To achieve the above objective, the present invention provides a floating object observation device that observes floating objects in a target liquid while floating on the surface of the target liquid, The system comprises a pair of floating bodies facing each other in a second direction intersecting the liquid being observed flowing in a first direction, and an imaging device supported by the floating bodies that images floating objects below the liquid surface from above the liquid surface. The floating body has a first floating body portion that intersects with the liquid surface, and a second floating body portion that extends downward from the first floating body portion and is submerged below the liquid surface. The horizontal cross-sectional area of ​​the first floating section is set to be wider than the horizontal cross-sectional area of ​​the second floating section. The first floating section has a height greater than the vertical fluctuation range of the waterline. The horizontal cross-sectional area of ​​the first floating section is constant at least over the range of vertical variation of the waterline. The vertical length of the second floating section is longer than the vertical length of the first floating section. The observed liquid flows in a first direction between a pair of floating bodies.

[0009] According to this, the first floating body intersects with the liquid surface, and since the horizontal cross-sectional area of ​​the first floating body is larger than the horizontal cross-sectional area of ​​the second floating body, the restoring force increases when the floating object observation device tilts.

[0010] Furthermore, the second floating body extends downward from the first floating body and is submerged below the liquid surface. Since the horizontal cross-sectional area of ​​the second floating body is smaller than that of the first floating body, the height (vertical length) of the second floating body needs to be increased (longer) in order to obtain sufficient buoyancy. This lowers the center of gravity of the floating object observation device, thereby suppressing the swaying of the floating object observation device and improving its stability.

[0012] Also, For example, when adjusting the waterline position by adding weights to a floating structure, the amount of sinking of the floating structure per unit weight is kept constant. Therefore, the required weight can be easily calculated, and the waterline position can be easily adjusted.

[0014] moreover, As the depth from the liquid surface to the lower end of the second floating body increases, the center of gravity of the floating object observation device is lowered, improving the stability of the floating object observation device.

[0017] The present invention is a floating object observation device that observes floating objects in a target liquid while floating on the surface of the target liquid, The system comprises a pair of floating bodies facing each other in a second direction intersecting the liquid being observed flowing in a first direction, and an imaging device supported by the floating bodies that images floating objects below the liquid surface from above the liquid surface. The floating body has a first floating body portion that intersects with the liquid surface, and a second floating body portion that extends downward from the first floating body portion and is submerged below the liquid surface. The horizontal cross-sectional area of ​​the first floating section is set to be wider than the horizontal cross-sectional area of ​​the second floating section. The first floating body has an overhang that extends in a second direction from the upper end of the second floating body toward the adjacent floating body. A ballast device for adjusting the buoyancy of the floating body is provided below the protruding section. 、 The observed liquid flows in the first direction between a pair of floating bodies. It is.

[0018] According to this, the position of the waterline of the first floating section of the floating body can be adjusted vertically by adjusting the buoyancy of the floating body using a ballast device.

[0019] Furthermore, since the space formed below the protruding section and inside the second floating section can be effectively utilized to install the ballast device, the floating object observation device can be miniaturized in the second direction.

[0020] The third invention is a floating object observation device that observes floating objects in a target liquid while floating on the surface of the target liquid, The system comprises a pair of floating bodies facing each other in a second direction intersecting the liquid being observed flowing in a first direction, and an imaging device supported by the floating bodies that images floating objects below the liquid surface from above the liquid surface. The floating body has a first floating body portion that intersects with the liquid surface, and a second floating body portion that extends downward from the first floating body portion and is submerged below the liquid surface. The horizontal cross-sectional area of ​​the first floating section is set to be wider than the horizontal cross-sectional area of ​​the second floating section. The observed liquid flows between a pair of floating bodies in the first direction. The imaging device has an imaging device that images floating substances in the imaging range below the liquid surface, and a wave blocking member that surrounds the periphery of the imaging range and blocks the waves on the liquid surface. The wave blocking member has an inlet opening on the upstream side of the observation target liquid flowing in the first direction and an outlet opening on the downstream side of the observation target liquid flowing in the first direction.

[0021] According to this, the observation target liquid flows between a pair of floating bodies in the first direction, flows into the inside of the wave blocking member from the inlet, flows in the first direction inside the wave blocking member, and flows out of the outside of the wave blocking member from the outlet.

[0022] By imaging the observation target liquid flowing inside the wave blocking member with the imaging device, floating substances in the observation target liquid can be observed. At this time, since the waves on the liquid surface are blocked by the wave blocking member, generation of waves around the imaging range can be suppressed, and floating substances can be imaged in a state where the influence of the waves is eliminated. Thereby, a clear image of the floating substances can be obtained.

[0023] [[ID=2×4]]This 4 In the floating substance observation device of the present invention, the imaging device has a light source that irradiates sheet laser light from above the liquid surface to floating substances below the liquid surface. The imaging device images the floating substances irradiated with the sheet laser light in the imaging range below the liquid surface from above the liquid surface. The imaging range is formed inside the wave blocking member.

[0024] According to this, even if external light (light other than the sheet laser light) is incident on the liquid surface from the outside of the wave blocking member and reflected by the floating substances in the observation target liquid, the reflected external light is blocked by the wave blocking member below the liquid surface and thus does not reach the imaging device. Thereby, the influence of the external light can be eliminated and the floating substances in the observation target liquid can be observed. In the fifth invention, the floating object observation device has a floating body with a pointed tip that faces upstream of the liquid being observed, which is flowing in the first direction. According to this, the resistance the floating object experiences from the observed liquid flowing in the first direction is reduced. As a result, the stability of the floating object observation device is improved. [Effects of the Invention]

[0025] As described above, according to the present invention, it is possible to increase the restoring force when the floating object observation device is tilted and to lower the center of gravity of the floating object observation device, thereby suppressing the shaking of the floating object observation device and improving its stability. [Brief explanation of the drawing]

[0026] [Figure 1] This is a schematic side view of a floating object observation device according to the first embodiment of the present invention, showing it moored in a waterway. [Figure 2] This is a plan view of the floating object observation device. [Figure 3] This is a front view of the floating object observation device. [Figure 4] This is a partially cutaway side view of the floating object observation device. [Figure 5] This is a bottom view of the floating object observation device. [Figure 6] This figure shows the horizontal cross-sectional area of ​​the first floating body and the horizontal cross-sectional area of ​​the second floating body of one of the floating objects observation devices. [Figure 7] This is a cross-sectional view of the imaging device of the floating matter observation device, as seen from the direction of the raw water flow. [Figure 8] This is a cross-sectional view of the wave-breaking member of the imaging device for the floating object observation device, as seen from the width direction of the waterway. [Figure 9] This is a front view of the floating object observation device, showing the device tilted to one side. [Figure 10] This is a front view of a floating object observation device in Comparative Example 1, which is an embodiment of the first embodiment of the present invention. [Figure 11] This is a front view of a floating object observation device in Comparative Example 2 to the first embodiment of the present invention. [Figure 12]This is a front view of a floating object observation device according to a second embodiment of the present invention. [Figure 13] This is a front view of the floating body of the floating object observation device according to the third embodiment of the present invention. [Figure 14] This is a front view of the floating body of the floating object observation device according to the fourth embodiment of the present invention. [Figure 15] This is a schematic plan view showing the arrangement of the floating body of the floating object observation device in the fifth embodiment of the present invention. [Figure 16] This is a schematic plan view showing the arrangement of the floating bodies of the floating object observation device in the sixth embodiment of the present invention. [Figure 17] This is a schematic plan view showing the arrangement of the floating bodies of the floating object observation device in the seventh embodiment of the present invention. [Figure 18] This is a schematic plan view showing the arrangement of the floating bodies of the floating object observation device in the eighth embodiment of the present invention. [Modes for carrying out the invention]

[0027] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0028] (First Embodiment) In the first embodiment, as shown in Figure 1, a water channel 1 is formed in a floc formation pond such as a water treatment plant, and raw water 2 (an example of the liquid to be observed) flows through the water channel 1 in a first direction 3 (hereinafter referred to as the flow direction 3 of raw water 2). The water channel 1 is located outdoors, and a large number of flocs 4 (an example of suspended matter) are formed in the raw water 2.

[0029] Within the waterway 1, a floating object observation device 11 is moored, floating on the surface 5 (an example of the liquid surface) of the raw water 2, to observe flocs 4 in the raw water 2. As shown in Figures 2 to 5, the floating object observation device 11 has a pair of floating bodies 12 and 13 facing each other in a second direction 6 (hereinafter referred to as the width direction 6 of the waterway 1) perpendicular to (an example of intersecting) the flow direction 3 of the raw water 2, and an imaging device 14 supported by both floating bodies 12 and 13 to image the flocs 4 below the water surface 5 from above the water surface 5.

[0030] As shown in Figures 1 and 2, a beam 7 spans the upper part of the waterway 1. A pair of opposing support columns 8 and 9 are provided on the beam 7, facing downwards in the width direction 6 of the waterway 1. One floating body 12 is moored to one support column 8 via one rope 16 (an example of a cable), and the other floating body 13 is moored to the other support column 9 via the other rope 17 (an example of a cable).

[0031] As shown in Figures 2 to 5, the floating bodies 12 and 13 are each box-shaped members made of metal (e.g., stainless steel) with a hollow interior, and each has a first floating body portion 21 that intersects (contacts) the water surface 5, and a second floating body portion 22 that extends downward from the first floating body portion 21 and is submerged below the water surface 5.

[0032] The raw water 2 flows between the pair of floating bodies 12 and 13 in the flow direction 3 (i.e., the first direction).

[0033] As shown in Figure 6, the length L1 of the first floating body 21 in the flow direction 3 is set to be the same as the length L2 of the second floating body 22. Also, the width W1 of the first floating body 21 is set to be larger than the width W2 of the second floating body 22. As a result, the horizontal cross-sectional area S1 of the first floating body 21, shown by the shaded area in Figure 6, is set to be wider than the horizontal cross-sectional area S2 of the second floating body 22.

[0034] As shown in Figures 2 and 6, the first floating body 21 has a pointed, mountain-shaped tip facing upstream in the flow direction 3, and a pointed, mountain-shaped tip facing downstream. Similarly, as shown in Figures 5 and 6, the second floating body 22 has a pointed, mountain-shaped tip facing upstream in the flow direction 3, and a pointed, downstream tip.

[0035] As shown in Figures 3, 4, and 6, the first floating body 21 has a height H1 (vertical length) that is greater than or equal to the vertical fluctuation range 24 of the waterline 23. The horizontal cross-sectional area S1 of the first floating body 21 is constant across the height H1 of the first floating body 21.

[0036] The height H2 (vertical length) of the second floating section 22 is set higher than the height H1 of the first floating section 21. The horizontal cross-sectional area S2 of the second floating section 22 is constant across the height H2 of the second floating section 22.

[0037] As shown in Figures 3 and 5, the first floating portion 21 of one floating body 12 has an overhang 21a that extends in the width direction 6 from the upper end of the second floating portion 22 toward the opposing floating body 13. Similarly, the first floating portion 21 of the other floating body 13 has an overhang 21a that extends in the width direction 6 from the upper end of the second floating portion 22 toward the opposing floating body 12.

[0038] A reinforcing member 27, such as a brace, is provided between the lower end of the second floating portion 22 of one floating body 12 and the lower end of the second floating portion 22 of the other floating body 13.

[0039] As shown in Figure 7, the imaging device 14 includes a light source 31 that irradiates sheet laser light 30 (an example of observation light) onto the floc 4 below the water surface 5 from above the water surface 5 between the two floating bodies 12 and 13, a camera 33 (an example of imaging equipment) that images the floc 4 irradiated by the sheet laser light 30 from above the water surface 5 in the imaging range 32 below the water surface 5, and a case 34 that houses the light source 31 and the camera 33.

[0040] In a plan view, the sheet laser beam 30 spreads out in a fan shape from the light source 31 in the flow direction 3 of the raw water 2, and as shown in Figure 7, it is almost linear when viewed from the flow direction 3.

[0041] Furthermore, the imaging range 32 is the range in which the camera 33 images the floc 4 irradiated with the sheet laser light 30, and the camera 33's focus is set to the imaging range 32.

[0042] Furthermore, due to errors during the manufacturing of the floating object observation device 11, there are slight variations in the weight of the floating bodies 12 and 13 and the imaging device 14. As a result, the waterline 23 may fluctuate up and down within a range of variation 24. When the waterline 23 fluctuates in this way, the distance from the camera 33 to the water surface 5 may differ from the design value, potentially causing the image captured by the camera 33 to become unclear. For this reason, the position of the waterline 23 is adjusted so that the distance from the camera 33 to the water surface 5 matches the design value.

[0043] Case 34 is supported by a support frame 35 spanning between the upper ends of both floating bodies 12 and 13, and has a case member 36 exposed above the water surface 5 and a wave-breaking member 37 provided at the lower part of the case member 36. The wave-breaking member 37 surrounds the imaging range 32 and blocks waves from the water surface 5, and has an inverted triangular shape in which the width decreases towards the bottom when viewed from the front. The imaging range 32 is formed inside the wave-breaking member 37.

[0044] As shown in Figures 3 to 5 and Figure 8, the wave-breaking member 37 has an inlet 38 that opens upstream in the flow direction 3 of the raw water 2, and an outlet 39 that opens downstream in the flow direction 3. The inlet 38 is submerged below the water surface 5. The outlet 39 is formed at a height through which the water surface 5 (i.e., the waterline 23) passes.

[0045] Furthermore, the position of the waterline 23 of the first floating body section 21 of the floating bodies 12 and 13 is adjusted so that the water surface 5 passes through the outlet 39.

[0046] Furthermore, a narrow, slit-shaped lower discharge port 40 is formed at the lower end of the wave-breaking member 37, which opens below the water surface 5.

[0047] The following explains the operation of the above configuration.

[0048] As shown in Figures 2, 4, and 8, the raw water 2 flowing in the waterway 1 flows in the flow direction 3 between the pair of floating bodies 12 and 13, flows into the inside of the wave-breaking member 37 from the inlet 38 of the imaging device 14, flows in the flow direction 3 inside the wave-breaking member 37, and flows out to the outside of the wave-breaking member 37 from the outlet 39.

[0049] In this state, as shown in Figure 7, sheet laser light 30 is irradiated from the light source 31 toward the water surface 5, and the camera 33 images the flocs 4 within the imaging range 32. At this time, the waves on the water surface 5 are blocked by the wave-breaking member 37, so the generation of waves inside the wave-breaking member 37 is suppressed, and the flocs 4 in the raw water 2 can be imaged while the influence of waves is eliminated. As a result, a clear image of the flocs 4 can be obtained.

[0050] Furthermore, even if scum floating on the water surface 5 flows into the inside of the wave-breaking member 37 from the inlet 38 along with the raw water 2, as shown in Figure 8, the outlet 39 is formed at the height through which the water surface 5 passes, so the scum is easily discharged from the inside of the wave-breaking member 37 through the outlet 39 to the outside of the wave-breaking member 37. This prevents scum from accumulating inside the wave-breaking member 37.

[0051] Furthermore, as shown in Figure 7, since the imaging range 32 is formed inside the wave-breaking member 37, even if ambient light 41 (external light other than the sheet laser light 30 emitted from the light source 31, such as sunlight) is incident on the water surface 5 from outside the wave-breaking member 37 and reflected by the flocs 4 in the raw water 2, the reflected ambient light 42 is blocked by the wave-breaking member 37 below the water surface 5 and does not reach the lens of the camera 33. As a result, the flocs 4 in the raw water 2 can be observed while eliminating the influence of ambient light 41 and 42.

[0052] Furthermore, if the floc 4 that flows into the inside of the wave-breaking member 37 from the inlet 38 along with the raw water 2 settles, the settled floc 4 is discharged from the inside of the wave-breaking member 37 through the lower discharge port 40 to the bottom of the wave-breaking member 37. This prevents the floc 4 from settling and accumulating inside the wave-breaking member 37.

[0053] Furthermore, as shown in Figure 7, since ambient light 41 such as sunlight is blocked by the case member 36, it is possible to prevent ambient light 41 from entering the lens of the camera 33. In this way, the flocs 4 in the raw water 2 can be observed while eliminating the influence of ambient light 41, so that even highly accurate observations can be made with raw water 2 (purified water, etc.) that has high transparency.

[0054] Furthermore, as shown in Figure 3, the first floating body portion 21 of the floating bodies 12 and 13 intersects (contacts) the water surface 5, and as shown in Figure 6, the horizontal cross-sectional area S1 of the first floating body portion 21 is wider than the horizontal cross-sectional area S2 of the second floating body portion 22, so the restoring force when the floating object observation device 11 tilts is increased.

[0055] For example, as shown in Figure 9, if the floating object observation device 11 tilts to one side due to the influence of waves formed on the water surface 5, and one of the floating bodies 12 sinks by ΔD, the buoyancy of the other floating body 12 increases by ΔF, which corresponds to the volume shown by "sinking amount ΔD × horizontal cross-sectional area S1 of the first floating body part 21". This increased buoyancy ΔF will be referred to as the increased buoyancy ΔF below.

[0056] If distance L is the horizontal distance from the center of gravity A of the floating object observation device 11 to the point of application of the increased buoyancy force ΔF, then a moment M is generated in the direction of restoring the floating object observation device 11 when it is tilted to one side. This moment M is expressed as "increased buoyancy force ΔF × distance L". Here, as shown in Figure 6, the horizontal cross-sectional area S1 of the first floating body part 21 is wider than the horizontal cross-sectional area S2 of the second floating body part 22, and as shown in Figure 9, the water surface 5 intersects with the first floating body part 21, so a larger increased buoyancy force ΔF is generated compared to when the water surface 5 intersects with the second floating body part 22. As a result, the moment M increases, and the restoring force when the floating object observation device 11 is tilted increases.

[0057] Furthermore, as shown in Figure 3, the second floating body section 22 extends downward from the first floating body section 21 and is submerged below the water surface 5. Since the horizontal cross-sectional area S2 of the second floating body section 22 is smaller than the horizontal cross-sectional area S1 of the first floating body section 21, the height H2 of the second floating body section 22 needs to be increased in order to obtain sufficient buoyancy. As a result, the depth from the water surface 5 to the lower end of the second floating body section 22 increases, which lowers the center of gravity A of the floating object observation device 11, suppresses the swaying of the floating object observation device 11, and improves the stability of the floating object observation device 11.

[0058] Furthermore, as shown in Figures 2 and 5, since the tips of the floating bodies 12 and 13 are pointed towards the upstream side in the flow direction 3, the resistance that the floating bodies 12 and 13 receive from the raw water 2 flowing in the channel 1 is reduced. As a result, the stability of the floating object observation device 11 is further improved.

[0059] As described above, it is possible to increase the restoring force when the floating object observation device 11 tilts and to lower the center of gravity A of the floating object observation device 11 at the same time. This suppresses the swaying of the floating object observation device 11 and improves its stability.

[0060] Furthermore, in order to adjust the distance from the camera 33 to the water surface 5 to the design value, weights may be placed on the floating bodies 12 and 13 to adjust the position of the waterline 23 of the first floating body section 21, as shown in Figure 3.

[0061] When adjusting the waterline 23 in this way, the horizontal cross-sectional area S1 of the first floating body 21 remains constant over the height H1 of the first floating body 21. Therefore, the amount of sinking A [mm / kg] of both floating bodies 12 and 13 per unit weight is kept constant. For this reason, the required weight can be easily determined, and the position of the waterline 23 can be easily adjusted.

[0062] For example, if the sinking amount A is 2 [mm / kg], in order to sink the floating bodies 12 and 13 floating on the water surface 5 by another 4 mm and raise the waterline 23 by 4 mm, a 2 kg weight should be placed on both floating bodies 12 and 13.

[0063] Alternatively, to raise the floats 12 and 13 by 2 mm and lower the waterline 23 by 2 mm from a state where a 2 kg weight is placed on them, one can remove 1 kg of the 2 kg weight placed on both floats 12 and 13 from both floats 12 and 13.

[0064] By adjusting the position of the waterline 23 of the first floating body 21 in this way, the distance from the camera 33 to the water surface 5 can be easily adjusted to the design value.

[0065] (Comparative Example 1) In the first embodiment described above, as shown in Figure 3, both floating bodies 12 and 13 each have a first floating body portion 21 and a second floating body portion 22. However, in Comparative Example 1, which will be described below, as shown in Figure 10, both floating bodies 12 and 13 each have a first floating body portion 21 but do not have a second floating body portion 22.

[0066] In the first embodiment described above, the horizontal cross-sectional area S1 of the first floating body 21 is set to be wider than the horizontal cross-sectional area S2 of the second floating body 22. Therefore, in Comparative Example 1, the depth D from the water surface 5 to the lower ends of the floating bodies 12 and 13 can be made shallower than in the first embodiment, while still ensuring the necessary buoyancy.

[0067] As a result, in Comparative Example 1, the restoring force when the floating object observation device 11 tilts increases, similar to that of the first embodiment, but the center of gravity A of the floating object observation device 11 is at a higher position than that of the first embodiment. Therefore, the floating object observation device 11 becomes more prone to swaying compared to that of the first embodiment, and the stability of the floating object observation device 11 is reduced compared to that of the first embodiment.

[0068] (Comparative Example 2) In the first embodiment described above, as shown in Figure 3, both floating bodies 12 and 13 each have a first floating body portion 21 and a second floating body portion 22. However, in Comparative Example 2, which will be described below, as shown in Figure 11, both floating bodies 12 and 13 each have a second floating body portion 22, but do not have a first floating body portion 21.

[0069] In the first embodiment described above, the horizontal cross-sectional area S2 of the second floating body 22 is set to be smaller than the horizontal cross-sectional area S1 of the first floating body 21. Therefore, in Comparative Example 2, in order to secure the required buoyancy, the depth D from the water surface 5 to the lower ends of the floating bodies 12 and 13 is deeper than that of the first embodiment.

[0070] As a result, in Comparative Example 2, the center of gravity A of the floating object observation device 11 is at a lower position than that of the first embodiment, and, similar to the first embodiment, the swaying of the floating object observation device 11 is suppressed, improving the stability of the floating object observation device 11.

[0071] However, as described above, since the horizontal cross-sectional area S2 is smaller than the horizontal cross-sectional area S1, in Comparative Example 2, the increased buoyancy ΔF when the floating object observation device 11 tilts in one direction is smaller than that of the first embodiment, and therefore the moment M in the restoring direction is also smaller than that of the first embodiment. Consequently, the restoring force when the floating object observation device 11 tilts is lower compared to that of the first embodiment.

[0072] As described above, in Comparative Example 1 and Comparative Example 2, it is difficult to simultaneously increase the restoring force when the floating object observation device 11 is tilted and to lower the center of gravity A of the floating object observation device 11.

[0073] (Second Embodiment) In the first embodiment described above, weights are placed on the floating bodies 12 and 13 to adjust the position of the waterline 23 of the first floating body section 21. However, in the second embodiment described below, as shown in Figure 12, instead of weights, ballast tanks 26 (an example of a ballast device) are provided below the overhang 21a of one floating body 12 and below the overhang 21a of the other floating body 13. Piping 43 for injecting and discharging ballast water into and out of the ballast tanks 26 is connected to the ballast tanks 26.

[0074] According to this, by injecting ballast water into the ballast tank 26 through the piping 43 or discharging it from the ballast tank 26 to adjust the amount of ballast water in the ballast tank 26, the overall weight of the floating object observation device 11 can be adjusted, thereby adjusting the position of the waterline 23 of the first floating body section 21 of the floating bodies 12 and 13 vertically.

[0075] Furthermore, since the ballast tank 26 can be installed by effectively utilizing the space 44 formed below the protruding portion 21a and inside the second floating portion 22, the floating object observation device 11 can be miniaturized in the width direction 6.

[0076] In the second embodiment described above, the ballast tank 26 is attached to the outside of the floating bodies 12 and 13, but it may also be attached to the inside of the floating bodies 12 and 13.

[0077] (Third and fourth embodiments) In the first embodiment described above, as shown in Figures 3 and 6, the second floating body portion 22 of the floating bodies 12 and 13 has a constant horizontal cross-sectional area S2. However, in the third embodiment, as shown in Figure 13, the second floating body portion 22 may be shaped such that its horizontal cross-sectional area S2 gradually decreases continuously downwards.

[0078] Furthermore, as a fourth embodiment, as shown in Figure 14, the second floating body portion 22 may be shaped such that its horizontal cross-sectional area S2 gradually decreases towards the bottom.

[0079] (Embodiments 5 to 8) In the first embodiment described above, as shown in Figure 2, the two floating bodies 12 and 13 are arranged in parallel. However, in the fifth embodiment, as shown in Figure 15, the two floating bodies 12 and 13 are arranged in a "V" shape, and the distance between the two floating bodies 12 and 13 is wider on the upstream side than on the downstream side in the flow direction 3 of the raw water 2.

[0080] Furthermore, in the sixth embodiment, as shown in Figure 16, the two floating bodies 12 and 13 are arranged in an inverted "V" shape, and the distance between the two floating bodies 12 and 13 is wider on the downstream side than on the upstream side in the flow direction 3 of the raw water 2.

[0081] Furthermore, in the seventh embodiment, as shown in Figure 17, one floating body 12 is divided into an upstream divided floating body 12a and a downstream divided floating body 12b in the flow direction 3 (forward-backward direction). Similarly, the other floating body 13 is also divided into an upstream divided floating body 13a and a downstream divided floating body 13b. The distance between the two upstream divided floating bodies 12a and 13a is wider on the downstream side than on the upstream side in the flow direction 3 of the raw water 2. Also, the distance between the two downstream divided floating bodies 12b and 13b is wider on the upstream side than on the downstream side in the flow direction 3 of the raw water 2.

[0082] Furthermore, in the eighth embodiment, as shown in Figure 18, the distance between the two split floating bodies 12a and 13a on the upstream side is wider on the upstream side than on the downstream side in the flow direction 3 of the raw water 2. Also, the distance between the two split floating bodies 12b and 13b on the downstream side is wider on the downstream side than on the upstream side in the flow direction 3 of the raw water 2.

[0083] In each of the embodiments described above, the suspended solids observation device 11 is moored to the water channel 1 of the floc formation pond, but it may also be installed in a place other than the floc formation pond, for example, a sedimentation pond. Furthermore, although the suspended solids observation device 11 observes floc 4, which is an example of suspended solids, it may also observe particles other than floc 4. [Explanation of Symbols]

[0084] 2. Raw water (liquid to be observed) 3. Flow direction (first direction) 4. Flocculation (floating matter) 5 Water surface (liquid surface) 6 Width direction (second direction) 11. Floating Object Observation Device 12,13 Floating bodies 14 Imaging device 21 First floating section 21a Overhang 22 Second floating section 23 Waterline 24 Fluctuation range 26. Ballast tank (ballast equipment) 30-sheet laser beam 31 Light source 32 Imaging range 33. Camera (imaging device) 37 Wave-breaking member 38 Inlet 39 Outlet H1 Height of the first floating section (vertical length) H2 Height of the second floating section (vertical length) S1 Horizontal cross-sectional area of ​​the first floating section S2 Horizontal cross-sectional area of ​​the second floating section

Claims

1. A floating object observation device that observes suspended matter in a target liquid while floating on the surface of the target liquid, The system comprises a pair of floating bodies facing each other in a second direction intersecting the liquid being observed flowing in a first direction, and an imaging device supported by the floating bodies that images suspended objects below the liquid surface from above the liquid surface. The floating body has a first floating body portion that intersects with the liquid surface, and a second floating body portion that extends downward from the first floating body portion and is submerged below the liquid surface. The horizontal cross-sectional area of ​​the first floating section is set to be wider than the horizontal cross-sectional area of ​​the second floating section. The first floating section has a height greater than the vertical fluctuation range of the waterline. The horizontal cross-sectional area of ​​the first floating section is constant at least over the range of vertical variation of the waterline. The vertical length of the second floating section is longer than the vertical length of the first floating section. A floating object observation device characterized in that the liquid to be observed flows in a first direction between a pair of floating bodies.

2. A floating object observation device for observing floating objects in a target liquid while floating on the surface of the target liquid, The system comprises a pair of floating bodies facing each other in a second direction intersecting the liquid being observed flowing in a first direction, and an imaging device supported by the floating bodies that images suspended objects below the liquid surface from above the liquid surface. The floating body has a first floating body portion that intersects with the liquid surface, and a second floating body portion that extends downward from the first floating body portion and is submerged below the liquid surface. The horizontal cross-sectional area of ​​the first floating section is set to be wider than the horizontal cross-sectional area of ​​the second floating section. The first floating body has an overhang that extends in a second direction from the upper end of the second floating body toward the adjacent floating body. A ballast device for adjusting the buoyancy of the floating body is provided below the protruding section. A floating object observation device characterized in that the liquid to be observed flows in a first direction between a pair of floating bodies.

3. A floating object observation device for observing floating objects in a target liquid while floating on the surface of the target liquid, The system comprises a pair of floating bodies facing each other in a second direction intersecting the liquid being observed flowing in a first direction, and an imaging device supported by the floating bodies that images suspended objects below the liquid surface from above the liquid surface. The floating body has a first floating body portion that intersects with the liquid surface, and a second floating body portion that extends downward from the first floating body portion and is submerged below the liquid surface. The horizontal cross-sectional area of ​​the first floating section is set to be wider than the horizontal cross-sectional area of ​​the second floating section. The observed liquid flows between a pair of floating bodies in the first direction. The imaging device comprises an imaging device that images floating objects in the imaging range below the liquid surface, and a wave-breaking member that surrounds the imaging range and blocks waves on the liquid surface. A floating object observation device characterized in that the wave-breaking member has an inlet that opens on the upstream side of the observation target liquid flowing in the first direction, and an outlet that opens on the downstream side of the observation target liquid flowing in the first direction.

4. The imaging device has a light source that irradiates sheet laser light from above the liquid surface onto floating matter below the liquid surface, The imaging device captures images of suspended objects irradiated with sheet laser light in the imaging range below the liquid surface, from above the liquid surface. The floating object observation device according to claim 3, characterized in that the imaging range is formed inside the wave-breaking member.

5. The floating object observation device according to any one of claims 1 to 4, characterized in that the floating body has a pointed tip facing upstream of the liquid to be observed flowing in the first direction.

Images