Flow cell

Abstract

To provide a flow cell with which it is possible to suppress or avoid a measurement failure due to the passage of air bubbles, etc.SOLUTION: The present invention comprises: a container body having fluid inflow and outflow openings and a flow velocity control path provided in a region between the inflow and the outflow openings; a light-emitting unit capable of emitting light toward a fluid circulating in the flow velocity control path; and a light-receiving unit for receiving the light emitted from the light-emitting unit. The flow velocity control path includes a control path inflow opening through which the fluid flowed in from the inflow opening flows in, and a control path outflow opening from which the fluid flowed in through the control path inflow opening flows out. The aperture area of the control path inflow opening and the aperture area of the control path outflow opening are equal.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a flow cell.

Background Art

[0002] Conventionally, when determining the water quality of a liquid using a light source and a sensor, a flow cell has been used. For example, Patent Document 1 describes a flow cell including an inflow path and an outflow path for a liquid, and a container body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the flow cell described in Patent Document 1, the ratio of the cross-sectional area of the inflow path to the cross-sectional area of the container body is large, and when the liquid flows from the inflow path into the container body, the flow velocity of the liquid changes significantly, so that turbulent flow occurs inside the container body. Further, in the flow cell described in Patent Document 1, since the cross-sectional area changes between the inflow path and the container body, pressure fluctuations occur between the inflow path and the inside of the container body.

[0005] As described above, in the flow cell described in Patent Document 1, turbulent flow occurs inside the container body, and pressure fluctuations occur between the inflow path and the inside of the container body, so that bubbles are generated inside the container body. The generation of such bubbles causes measurement errors in the sensor.

[0006] The present invention has been made in view of the above problems, and an object thereof is to provide a flow cell capable of suppressing or avoiding measurement failures due to the passage of bubbles or the like.

Means for Solving the Problems

[0007] The flow cell according to the present invention includes a container main body having a liquid inlet and outlet, and a flow velocity control path provided in a region between the inlet and the outlet, a light emitting unit capable of irradiating light toward the liquid flowing through the flow velocity control path, and a light receiving unit that receives the light emitted from the light emitting unit. The flow velocity control path has a control path inlet into which the liquid flowing in from the inlet flows, and a control path outlet from which the liquid flowing into the control path inlet flows out, and the opening area of the control path inlet and the opening area of the control path outlet are equal.

[0008] In the flow cell according to the present invention, it is preferable that the light emitting unit is provided at one end in the flow path direction of the flow velocity control path, and the light receiving unit is provided at the other end in the flow path direction of the flow velocity control path.

[0009] In the flow cell according to the present invention, the cross-sectional area of the flow velocity control path may be equal to the opening area of the control path inlet and the opening area of the control path outlet.

[0010] In the flow cell according to the present invention, it is preferable that the cross-sectional area of the flow velocity control path is equal to the opening area of at least one of the inlet and the outlet.

[0011] In the flow cell according to the present invention, either one of the light emitting unit and the light receiving unit provided on the downstream side of the flow velocity control path may be provided at a position different from that of the other one of the light emitting unit and the light receiving unit provided on the upstream side of the flow velocity control path in the height direction.

[0012] In the flow cell according to the present invention, the container main body has a light emitting unit side mounting portion on which the light emitting unit can be mounted and a light receiving unit side mounting portion on which the light receiving unit can be mounted. The light emitting unit side mounting portion preferably has a through hole for exposing the light emitting unit into the flow velocity control path, and the light receiving unit side mounting portion preferably has a through hole for exposing the light receiving unit into the flow velocity control path.

[0013] In the flow cell according to the present invention, the container body may have a plurality of the flow rate control paths.

Advantages of the Invention

[0014] According to the flow cell of the present invention, it is possible to suppress or avoid measurement problems due to the passage of bubbles or the like.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0016] Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. Note that the following embodiments do not limit the invention according to each claim, and not all combinations of the features described in the embodiments are essential for the solution means of the invention. Also, in the present embodiment, there are cases where the scales and dimensions of each component are exaggeratedly shown, and cases where some components are omitted.

[0017] [Overall Configuration of the Flow Cell] As shown in FIG. 1, the flow cell 1' according to the present embodiment includes a container body 10' and a light emitting unit 30 and a light receiving unit 40 provided on the container body 10'.

[0018] [Configuration of the Container Body] As shown in Fig. 1, the container body 10' has a bottom plate portion 11 and a top plate portion 12 formed in a long rectangular shape, a pair of side wall portions 13 formed from both longitudinal ends of the bottom plate portion 11 to both longitudinal ends of the top plate portion 12, and a front wall portion and a rear wall portion RW formed from both short sides of the bottom plate portion 11 to both short sides of the top plate portion 12, and is formed in a box shape having an internal space IS as a whole. Note that Fig. 1 is a schematic view in a state where the front wall portion is made transparent.

[0019] In this specification, the direction from the bottom plate portion 11 to the top plate portion 12 (or the direction from the top plate portion 12 to the bottom plate portion 11) is defined as the "height direction". Also, in this specification, in the height direction, the direction in which the bottom plate portion 11 is located is defined as "downward", and the direction in which the top plate portion 12 is located is defined as "upward".

[0020] The container body 10' has a liquid inflow passage 14 at the lower end of one of the side wall portions 13. The inflow passage 14 is formed in a cylindrical shape having an internal space through which liquid can flow, and extends outward from the outer surface of one of the side wall portions 13. Also, the tip and the base end of the inflow passage 14 are open. In the present embodiment, the tip of the inflow passage 14 functions as a liquid inlet 14a. In other words, the inlet 14a is an opening formed at the tip of the inflow passage 14.

[0021] Similarly, the container body 10' has a liquid outflow passage 15 at the upper end of the other side wall portion 13. The outflow passage 15 is formed in a cylindrical shape having an internal space through which liquid can flow, and extends outward from the outer surface of the other side wall portion 13. Also, the tip and the base end of the outflow passage 15 are open. In the present embodiment, the tip of the outflow passage 15 functions as a liquid outlet 15a. In other words, the outlet 15a is an opening formed at the tip of the outflow passage 15.

[0022] In addition, the container body 10’ has a flow velocity control path 16 provided in the region between the inflow port 14a and the outflow port 15a. Specifically, the flow velocity control path 16 is provided in the internal space IS defined by the bottom plate portion 11, the top plate portion 12, the side wall portion 13, the front wall portion, and the rear wall portion RW.

[0023] The flow velocity control path 16 is formed in a cylindrical shape having an internal space capable of flowing a liquid, and is formed to extend along the same direction as the opening directions (i.e., the left - right direction) of the inflow port 14a and the outflow port 15a. Specifically, the flow velocity control path 16 is formed to extend from one side wall portion 13 toward the other side wall portion 13.

[0024] In the present embodiment, the cross - sectional area of the flow path of the flow velocity control path 16 is constant in the flow path direction of the flow velocity control path 16. Further, it is preferable that the cross - sectional area of the flow path of the flow velocity control path 16 is formed to be equal to at least one of the opening areas of the inflow port 14a and the outflow port 15a. In the present embodiment, the cross - sectional area of the flow path of the flow velocity control path 16 is formed to be equal to the opening areas of both the inflow port 14a and the outflow port 15a.

[0025] In this specification, “equal” in terms of area means that the area is within the range of ±5%.

[0026] In addition, the flow velocity control path 16 has a control path inflow port 16a into which the liquid flowing in from the inflow port 14a flows, and a control path outflow port 16b through which the liquid flowing into the control path inflow port 16a flows out. The control path inflow port 16a is an opening formed at the lower end of the flow velocity control path 16 at one end in the flow path direction of the flow velocity control path 16. On the other hand, the control path outflow port 16b is an opening formed at the upper end of the flow velocity control path 16 at the other end in the flow path direction of the flow velocity control path 16.

[0027] Here, the opening area of the control path inflow port 16a and the opening area of the control path outflow port 16b are formed to be equal. Further, the cross - sectional area of the flow path of the flow velocity control path 16 is formed to be equal to the opening area of the control path inflow port 16a and the opening area of the control path outflow port 16b.

[0028] Further, the container body 10' has a light emitting part side mounting part 19 on which the light emitting part 30 can be mounted and a light receiving part side mounting part 20 on which the light receiving part 40 can be mounted. The light emitting part side mounting part 19 is provided on one side wall part 13 and has a through hole 19a for exposing the light emitting part 30 into the flow velocity control path 16. Similarly, the light receiving part side mounting part 20 is provided on the other side wall part 13 and has a through hole 20a for exposing the light receiving part 40 into the flow velocity control path 16. That is, the light emitting part side mounting part 19 and the light receiving part side mounting part 20 communicate with the flow velocity control path 16 respectively.

[0029] As the material of the container body 10', for example, a shielding metal, a resin plastic, or the like can be used. That is, as will be described later, in the flow cell 1' according to the present embodiment, since the light emitting part 30 is provided at one end in the flow path direction of the flow velocity control path 16 and the light receiving part 40 is provided at the other end in the flow path direction of the flow velocity control path 16, different from the conventional flow cell in which the light emitting part and the light receiving part are respectively attached to the outer surface of the container body, a non-translucent material can be used. Further, the container body 10' is preferably formed by integral molding using the above-described material. Note that the molding material and molding method of the container body 10' are not limited thereto. For example, in order to improve the measurement accuracy of the light receiving part 40, a light-shielding material may be used, a material that is easy to mold or process may be used, or various other known molding materials and molding methods may be used.

[0030] [Configuration of Light Emitting Part and Light Receiving Part] As shown in FIG. 1, the light emitting part 30 is provided at one end in the flow path direction of the flow velocity control path 16. Specifically, the light emitting part 30 is configured to be mountable to the light emitting part side mounting part 19 of the container body 10'. Further, the light emitting part 30 is configured to seal one end in the flow path direction of the flow velocity control path 16 when mounted to the light emitting part side mounting part 19.

[0031] The light emitting part 30 having the above configuration has, for example, an arbitrary light emitting element such as an LED, and is configured to irradiate light toward the liquid flowing through the flow velocity control path 16.

[0032] As shown in FIG. 1, the light receiving unit 40 is provided at the other end in the flow path direction of the flow rate control path 16. Specifically, the light receiving unit 40 is configured to be attachable to the light receiving unit side attachment portion 20 of the container body 10'. Further, the light receiving unit 40 is configured to seal the other end in the flow path direction of the flow rate control path 16 when attached to the light receiving unit side attachment portion 20.

[0033] The light receiving unit having the above configuration has an arbitrary light receiving element such as a photodiode, for example, and is configured to receive the light emitted from the light emitting unit 30. Specifically, the light receiving unit 40 is configured to receive the light emitted from the light emitting unit 30 and transmitted through the liquid flowing through the flow rate control path 16.

[0034] [Method of using the flow cell] The flow cell 1' according to the present embodiment is used by connecting the inflow path 14 to another flow path on the upstream side and connecting the outflow path 15 to another flow path on the downstream side. The liquid flowing into the inflow path 14 from another flow path on the upstream side flows through the internal space IS, the flow rate control path 16, and the outflow path 15, and flows into another flow path on the downstream side.

[0035] Further, in a state where the liquid is flowing through the flow rate control path 16, the light emitting unit 30 irradiates light toward the liquid flowing through the flow rate control path 16, and the light receiving unit 40 receives the light transmitted through the liquid flowing through the flow rate control path 16. The light quantity value (measurement value) received by the light receiving unit 40 is transmitted to, for example, a control device (not shown), and in the control device and the like, the water quality such as the turbidity and chromaticity of the liquid flowing through the flow cell 1' is determined.

[0036] [Advantages of the flow cell according to the present embodiment] Thus, the flow cell 1' according to this embodiment includes a container body 10' having a liquid inlet 14a and an outlet 15a, and a flow velocity control path 16 provided in a region between the inlet 14a and the outlet 15a, a light emitting unit 30 capable of irradiating light toward the liquid flowing through the flow velocity control path 16, and a light receiving unit 40 that receives the light emitted from the light emitting unit 30. The flow velocity control path 16 has a control path inlet 16a into which the liquid flowing in from the inlet 14a flows, and a control path outlet 16b from which the liquid flowing into the control path inlet 16a flows out, and the opening area of the control path inlet 16a and the opening area of the control path outlet 16b are equal.

[0037] According to the flow cell 1' having such a configuration, since the opening area of the control path inlet 16a and the opening area of the control path outlet 16b are equal, the flow velocity of the liquid does not change in the flow velocity control path 16. As a result, it is possible to prevent the generation of turbulent flow and pressure fluctuations in the flow velocity control path 16, and thus there is an advantage that measurement problems due to the generation and passage of bubbles can be suppressed or avoided. The flow cell 1' according to this embodiment is also suitably used for measuring a liquid having a relatively high flow velocity (a liquid having a flow velocity faster than 100 mL / min to 250 mL / min).

[0038] Further, according to the flow cell 1' having the above-described configuration, since the container body 10' has the flow velocity control path 16, there is an advantage that it is not necessary to separately provide piping for measurement, and continuous measurement is possible. That is, in a conventional flow cell, after the liquid is introduced into the container body and stored, the measurement by the light receiving unit (sensor) is performed in a state where the flow velocity of the liquid is stabilized. In the flow cell 1' according to this embodiment, the steps of storing the liquid and stabilizing the flow velocity can be omitted, and continuous measurement can be performed.

[0039] In the flow cell 1' according to this embodiment, the light emitting unit 30 is provided at one end in the flow path direction of the flow rate control path 16, and the light receiving unit 40 is provided at the other end in the flow path direction of the flow rate control path 16. According to the flow cell 1' having such a configuration, since the light emitting unit 30 and the light receiving unit 40 are provided in the flow rate control path 16 and directly irradiate and receive light with respect to the liquid flowing through the flow rate control path 16 (that is, do not irradiate and receive light through the side wall portion 13 or the like), for example, it is possible to measure a liquid with low turbidity or low chromaticity, or to discriminate a slight difference in turbidity or chromaticity. There is an advantage that the measurement accuracy is greatly improved as compared with a conventional flow cell in which the light emitting unit and the light receiving unit are respectively attached to the outer surface of the container body.

[0040] In the flow cell 1' according to this embodiment, the flow path cross-sectional area of the flow rate control path 16 is equal to the opening area of the control path inlet 16a and the opening area of the control path outlet 16b. According to the flow cell 1' having such a configuration, there is an advantage that it is possible to suppress or avoid measurement failures due to generation or passage of bubbles in the flow rate control path 16.

[0041] In the flow cell 1' according to this embodiment, the flow path cross-sectional area of the flow rate control path 16 is equal to the opening area of at least one of the inlet 14a and the outlet 15a. According to the flow cell 1' having such a configuration, there is an advantage that generation and retention of bubbles in the flow rate control path 16 can be further suppressed.

[0042] In the flow cell 1' according to this embodiment, the container body 10' has a light-emitting unit side mounting portion 19 on which the light-emitting unit 30 can be mounted and a light-receiving unit side mounting portion 20 on which the light-receiving unit 40 can be mounted. The light-emitting unit side mounting portion 19 has a through hole 19a that exposes the light-emitting unit 30 into the flow velocity control path 16, and the light-receiving unit side mounting portion 20 has a through hole 20a that exposes the light-receiving unit 40 into the flow velocity control path 16. According to the flow cell 1' having such a configuration, since the light-emitting unit 30 and the light-receiving unit 40 are respectively exposed in the flow velocity control path 16, for example, it is possible to measure a liquid with low turbidity or low chromaticity, or to discriminate a slight difference in turbidity or chromaticity. There is an advantage that the measurement accuracy is greatly improved as compared with a conventional flow cell in which the light-emitting unit and the light-receiving unit are respectively attached to the outer surface of the container body. Further, since the light-emitting unit 30 and the light-receiving unit 40 are detachable from the container body 10', there is also an advantage that replacement due to a failure of the light-emitting unit 30 and the light-receiving unit 40 is easy.

[0043] [Modification Example] The flow cell according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the technical idea of the present invention.

[0044] For example, in the above-described embodiment, the description has been made assuming that the light-emitting unit 30 is provided at one end in the flow path direction of the flow velocity control path 16 and the light-receiving unit 40 is provided at the other end in the flow path direction of the flow velocity control path 16. However, the present invention is not limited to this, and it may be provided at an arbitrary position.

[0045] Further, in the above-described embodiment, the description has been made assuming that only one light-emitting unit 30 is provided. However, the present invention is not limited to this, and two or more light-emitting units 30 may be provided. In this case, one light-emitting unit 30 (first light-emitting unit) may be provided at one end in the flow path direction of the flow velocity control path 16, and the other light-emitting unit 30 (second light-emitting unit) may be provided on the inner surface orthogonal to the flow path direction of the flow velocity control path 16. By providing two or more light-emitting units 30 (first light-emitting unit and second light-emitting unit), it is possible to specify not only the water quality such as the turbidity and chromaticity of the liquid flowing through the flow velocity control path 16, but also a slight difference or change in low turbidity or low chromaticity.

[0046] Furthermore, in the above-described embodiment, the flow path cross-sectional area of the flow velocity control path 16 has been described as being equal to the opening areas of the control path inlet 16a and the control path outlet 16b. However, the present invention is not limited to this, and a configuration in which they are not equal may also be acceptable.

[0047] Also, in the above-described embodiment, the flow path cross-sectional area of the flow velocity control path 16 has been described as being equal to the opening area of at least one of the inlet 14a and the outlet 15a. However, the present invention is not limited to this, and a configuration in which they are not equal may also be acceptable.

[0048] Furthermore, in the above-described embodiment, the light emitting unit 30 and the light receiving unit 40 have been described as being respectively exposed in the flow velocity control path. However, the present invention is not limited to this, and a configuration in which the light emitting unit 30 and the light receiving unit 40 are not respectively exposed in the flow velocity control path 16 may also be acceptable. That is, a configuration in which the light emitting unit 30 and the light receiving unit 40 are respectively provided on the outer surface of the side wall portion 13 may also be acceptable.

[0049] Also, for example, the light emitting unit 30 and the light receiving unit 40 may each constitute a part of the side wall portion 13.

[0050] Furthermore, in the above-described embodiment, the flow velocity control path 16 has been described as being formed in a cylindrical shape having an internal space capable of flowing a liquid. However, the present invention is not limited to this, and for example, the flow velocity control path 16 may have two plate-shaped partition portions extending from the front wall portion to the rear wall portion RW of the container body 10', and the two partition portions may be arranged at different heights.

[0051] In the above-described embodiment, the container body 10’ has been described as having the inflow passage 14 and the outflow passage 15. However, the present invention is not limited thereto. For example, like the flow cell 1’’ shown in FIG. 2 and the flow cell 1’’’ shown in FIG. 3, the container body 10’ may not have the inflow passage 14 and the outflow passage 15, and the inlet 14a may be directly formed in the bottom plate portion 11, and the outlet 15a may be directly formed in the top plate portion 12. Note that the flow cell 1’’ shown in FIG. 2 and the flow cell 1’’’ shown in FIG. 3 may have the inflow passage 14 and the outflow passage 15 in the same manner as the flow cell 1’ shown in FIG. 1.

[0052] Hereinafter, among the configurations of the flow cell 1’’ shown in FIG. 2 and the flow cell 1’’’ shown in FIG. 3, the configurations different from the flow cell 1’ shown in FIG. 1 will be described.

[0053] In the flow cell 1’’ shown in FIG. 2 and the flow cell 1’’’ shown in FIG. 3, the inlet 14a is formed at one longitudinal end of the bottom plate portion 11 (the left end in FIGS. 2 and 3), and the outlet 15a is formed at the end on the side opposite to the side where the inlet 14a is located in the longitudinal direction of the top plate portion 12 (the right end in FIGS. 2 and 3), and the flow velocity control passage 16 is formed to extend from the bottom plate portion 11 toward the top plate portion 12. In this regard, it is different from the flow cell 1’ shown in FIG. 1. By having such a configuration, before the liquid flows into the control passage inlet 16a of the flow velocity control passage 16, bubbles generated when the liquid flows into the internal space IS of the container body 10’ from the inlet 14a and solids contained in the liquid are removed (that is, the bubbles and solids rise in the internal space IS of the container body 10’ and move toward the top plate portion 12 side, and are discharged from the communicating outlet 15a to the outside of the flow cell 1’’ (or the flow cell 1’’’)). Therefore, it is possible to suppress or avoid measurement failures due to the generation and passage of bubbles in the flow velocity control passage 16, and there is an advantage that the measurement error in the light receiving portion 40 (sensor) can be reduced. Note that in the flow cell 1’’ shown in FIG. 2 and the flow cell 1’’’ shown in FIG. 3, the flow velocity control passage 16 is provided to be inclined with respect to the height direction, but it may be provided along the height direction.

[0054] In the flow cell 1'' shown in FIG. 2 and the flow cell 1''' shown in FIG. 3, the bubbles removed before the liquid flows into the control path inlet 16a of the flow velocity control path 16 are discharged from the outlet 15a. In addition to this, for example, the container body 10' may have a degassing hole capable of discharging bubbles, and may be configured to perform discharge in combination with the discharge by the outlet 15a.

[0055] In the flow cell 1'' shown in FIG. 2 and the flow cell 1''' shown in FIG. 3, either one of the light emitting part 30 and the light receiving part 40 provided on the downstream side of the flow velocity control path 16 is provided at a position different from the other one of the light emitting part 30 and the light receiving part 40 provided on the upstream side of the flow velocity control path 16 in the height direction, which is different from the flow cell 1' shown in FIG. 1. In the flow cell 1'' shown in FIG. 2 and the flow cell 1''' shown in FIG. 3, the light receiving part 40 is provided at a position higher than the light emitting part 30. By having such a configuration, since the flow velocity control path 16 is formed from the bottom plate part 11 toward the top plate part 12, as described above, there is an advantage that bubbles and solids can be removed before the liquid flows into the control path inlet 16a of the flow velocity control path 16.

[0056] The flow cell 1''' shown in FIG. 3 is different from the flow cell 1' shown in FIG. 1 in that it has a plurality (two in the example shown in FIG. 3) of the flow velocity control paths 16, the light emitting part 30, and the light receiving part 40 respectively. By having such a configuration, there is an advantage that the turbidity, chromaticity, etc. of the water quality of the liquid flowing through the flow velocity control path 16, a slight difference in low turbidity or low chromaticity, and its change can be more accurately specified by utilizing the difference in the measured values due to the optical path length difference and the light source difference. In the flow cell 1''' shown in FIG. 3, although the flow path lengths of the respective flow velocity control paths 16 are different, they may be the same.

[0057] It is clear from the description of the claims that such modifications are included in the scope of the present invention.

Explanation of Reference Numerals

[0058] 1': Flow cell 1'': Flow cell 1’’’ : Flow cell 10’ : Container body 11 : Bottom plate part 12 : Top plate part 13 : Side wall part 14 : Inflow path 14a : Inlet 15 : Outflow path 15a : Outlet 16 : Flow velocity control path 16a : Control path inlet 16b : Control path outlet 17 : First connection path 18 : Second connection path 19 : Light emitting part mounting part 19a : Through hole 20 : Light receiving part mounting part 20a : Through hole 30 : Light emitting part 40 : Light receiving part IS : Internal space RW : Rear wall part

Claims

1. A container body having an inlet and an outlet for a liquid, and a flow rate control path provided in a region between the inlet and the outlet; a light emitting unit capable of irradiating light toward the liquid flowing through the flow rate control path; a light receiving section that receives light emitted from the light emitting section; Equipped with The flow rate control path is a control path inlet into which the liquid flowing in from the inlet flows; a control path outlet through which the liquid flowing into the control path inlet flows out; It has The opening area of ​​the control path inlet and the opening area of ​​the control path outlet are equal Flow cell.

2. The light emitting unit is provided at one end of the flow velocity control path in a flow path direction, The light receiving portion is provided at the other end of the flow rate control path in the flow direction.

2. The flow cell of claim 1.

3. The flow passage cross-sectional area of ​​the flow velocity control passage is equal to the opening area of ​​the control passage inlet and the opening area of ​​the control passage outlet.

3. A flow cell according to claim 1 or 2.

4. The flow passage cross-sectional area of ​​the flow rate control passage is equal to the opening area of ​​at least one of the inlet and the outlet.

3. A flow cell according to claim 1 or 2.

5. One of the light-emitting unit and the light-receiving unit provided on the downstream side of the flow velocity control path is provided at a position different from the other of the light-emitting unit and the light-receiving unit provided on the upstream side of the flow velocity control path in the height direction. The flow cell of claim 2.

6. the container body has a light-emitting unit side attachment part to which the light-emitting unit can be attached and a light-receiving unit side attachment part to which the light-receiving unit can be attached, the light-emitting unit side attachment portion has a through hole through which the light-emitting unit is exposed within the flow rate control path, The light receiving unit side mounting portion has a through hole for exposing the light receiving unit in the flow rate control path.

3. A flow cell according to claim 1 or 2.

7. The container body has a plurality of the flow rate control paths.

3. A flow cell according to claim 1 or 2.

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