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 technology]

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

[0003] [Patent Document 1] International Publication No. 2014 / 027172 Summary of the Invention [Problem 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 inlet channel to the cross-sectional area of ​​the container body is large, and when liquid flows from the inlet channel into the container body, the flow rate of the liquid changes significantly, causing turbulence inside the container body. Also, in the flow cell described in Patent Document 1, the cross-sectional areas of the inlet channel and the container body change, causing pressure fluctuations between the inlet channel and inside the container body.

[0005] As described above, in the flow cell described in Patent Document 1, turbulence occurs inside the container body, and pressure fluctuations occur between the inflow channel and the inside of the container body, causing bubbles to form 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 its object is to provide a flow cell that can suppress or avoid measurement problems caused by the passage of air bubbles or the like. [Means for solving the problem]

[0007] The flow cell according to the present invention comprises a container body having an inlet and outlet for liquid, and a flow rate control path provided in the region between the inlet and outlet, a light-emitting unit capable of irradiating light toward the liquid flowing through the flow rate control path, and a light-receiving unit that receives the light emitted from the light-emitting unit, wherein the flow rate control path has a control path inlet through which liquid flowing in from the inlet flows, and a control path outlet through which 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 of the flow velocity control path in the flow direction, and the light receiving unit is provided at the other end of the flow velocity control path in the flow direction.

[0009] In the flow cell according to the present invention, the flow rate control channel may have a cross-sectional area equal to the opening area of ​​the control channel inlet and the opening area of ​​the control channel outlet.

[0010] In the flow cell according to the present invention, the flow rate control path preferably has a flow path cross-sectional area equal to the opening area of ​​at least one of the inlet and the outlet.

[0011] In the flow cell of the present invention, either the light-emitting unit or the light-receiving unit provided downstream of the flow rate control path may be provided at a different position in the height direction from the other of the light-emitting unit or the light-receiving unit provided upstream of the flow rate control path.

[0012] In the flow cell of the present invention, it is preferable that 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, and that the light-emitting unit side attachment part has a through-hole that exposes the light-emitting unit within the flow rate control path, and that the light-receiving unit side attachment part has a through-hole that exposes the light-receiving unit within the flow rate control path.

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

[0014] The flow cell of the present invention makes it possible to suppress or avoid measurement problems caused by the passage of air bubbles or the like. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic diagram showing a flow cell according to the present embodiment. [Figure 2] FIG. 10 is a schematic diagram showing a flow cell according to a modified example. [Figure 3] FIG. 10 is a schematic diagram showing a flow cell according to another modified example. DETAILED DESCRIPTION OF THE INVENTION

[0016] Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention. Furthermore, in the present embodiments, the scale and dimensions of each component may be exaggerated, and some components may be omitted.

[0017] [Overall configuration of the flow cell] As shown in FIG. 1, a flow cell 1' according to this embodiment includes a container body 10', and a light-emitting section 30 and a light-receiving section 40 provided in the container body 10'.

[0018] [Container body configuration] 1, the container body 10' has a bottom plate portion 11 and a top plate portion 12 formed in an elongated 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 lateral ends of the bottom plate portion 11 to both lateral ends 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 showing the front wall portion in a see-through state.

[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, the direction in which the bottom plate portion 11 is located is defined as the "downward direction," and the direction in which the top plate portion 12 is located is defined as the "upward direction."

[0020] The container body 10' has an inflow channel 14 for liquid at the lower end of one of the side walls 13. The inflow channel 14 is formed in a cylindrical shape with an internal space that allows liquid to flow, and is formed to extend outward from the outer surface of one of the side walls 13. The tip and base ends of the inflow channel 14 are open. In this embodiment, the tip of the inflow channel 14 functions as an inflow port 14a for liquid. In other words, the inflow port 14a is an opening formed at the tip of the inflow channel 14.

[0021] Similarly, the container body 10' has a liquid outflow channel 15 at the upper end of the other side wall portion 13. The outflow channel 15 is formed in a cylindrical shape having an internal space that allows the liquid to flow, and is formed to extend outward from the outer surface of the other side wall portion 13. The tip and base ends of the outflow channel 15 are open. In this embodiment, the tip of the outflow channel 15 functions as an outflow port 15a for the liquid. In other words, the outflow port 15a is an opening formed at the tip of the outflow channel 15.

[0022] The container body 10′ also has a flow rate control path 16 provided in the region between the inlet 14a and the outlet 15a. Specifically, the flow rate control path 16 is provided in an internal space IS defined by the bottom plate 11, the top plate 12, the side wall 13, the front wall RW, and the rear wall RW.

[0023] The flow rate control path 16 is formed in a cylindrical shape having an internal space that allows the liquid to flow, and extends in the same direction as the opening direction (i.e., the left-right direction) of the inlet 14a and the outlet 15a. Specifically, the flow rate control path 16 extends from one side wall portion 13 to the other side wall portion 13.

[0024] In this embodiment, the flow path cross-sectional area of ​​the flow velocity control path 16 is constant in the flow path direction of the flow velocity control path 16. Furthermore, the flow path cross-sectional area of ​​the flow velocity control path 16 is preferably formed to be equal to the opening area of ​​at least one of the inlet 14a and the outlet 15a. In this embodiment, the flow path cross-sectional area of ​​the flow velocity control path 16 is formed to be equal to the opening area of ​​both the inlet 14a and the outlet 15a.

[0025] In this specification, the term "equal" means that the areas are within a range of ±5%.

[0026] The flow rate control channel 16 has a control channel inlet 16a through which the liquid flowing in from the inlet 14a flows in, and a control channel outlet 16b through which the liquid flowing in to the control channel inlet 16a flows out. The control channel inlet 16a is an opening formed at the lower end of the flow rate control channel 16, at one end of the flow rate control channel 16 in the flow direction. On the other hand, the control channel outlet 16b is an opening formed at the upper end of the flow rate control channel 16, at the other end of the flow rate control channel 16 in the flow direction.

[0027] The opening area of ​​the control path inlet 16a and the opening area of ​​the control path outlet 16b are made equal. The flow path cross-sectional area of ​​the flow velocity control path 16 is also made equal to the opening area of ​​the control path inlet 16a and the opening area of ​​the control path outlet 16b.

[0028] The container body 10′ also has a light-emitting unit-side mounting part 19 to which the light-emitting unit 30 can be attached, and a light-receiving unit-side mounting part 20 to which the light-receiving unit 40 can be attached. The light-emitting unit-side mounting part 19 is provided on one side wall part 13, and has a through-hole 19a that exposes the light-emitting unit 30 within the flow rate control path 16. Similarly, the light-receiving unit-side mounting part 20 is provided on the other side wall part 13, and has a through-hole 20a that exposes the light-receiving unit 40 within the flow rate control path 16. In other words, the light-emitting unit-side mounting part 19 and the light-receiving unit-side mounting part 20 each communicate with the flow rate control path 16.

[0029] The container body 10' can be made of, for example, a light-shielding metal or resinous plastic. As described below, in the flow cell 1' according to this embodiment, the light-emitting unit 30 is provided at one end of the flow rate control path 16 in the flow direction, and the light-receiving unit 40 is provided at the other end of the flow rate control path 16 in the flow direction. Therefore, unlike conventional flow cells in which the light-emitting unit and the light-receiving unit are attached to the outer surfaces of the container body, a non-light-transmitting material can be used. Furthermore, the container body 10' is preferably formed by integral molding using the above-mentioned materials. The molding material and molding method for the container body 10' are not limited thereto. For example, a light-shielding material may be used to improve the measurement accuracy of the light-receiving unit 40, or a material that is easy to mold or process may be used. Various other known molding materials and molding methods may also be used.

[0030] [Configuration of light-emitting unit and light-receiving unit] 1, the light-emitting unit 30 is provided at one end in the flow path direction of the flow velocity control path 16. Specifically, the light-emitting unit 30 is configured to be attachable to the light-emitting unit-side attachment part 19 of the container body 10'. Furthermore, when the light-emitting unit 30 is attached to the light-emitting unit-side attachment part 19, it is configured to seal off one end in the flow path direction of the flow velocity control path 16.

[0031] The light emitting section 30 having the above configuration has any light emitting element such as an LED, and is configured to be able to irradiate light toward the liquid flowing through the flow rate control path 16.

[0032] 1, the light-receiving unit 40 is provided at the other end in the flow direction of the flow velocity control path 16. Specifically, the light-receiving unit 40 is configured to be attachable to the light-receiving unit-side attachment part 20 of the container body 10'. Furthermore, when attached to the light-receiving unit-side attachment part 20, the light-receiving unit 40 is configured to seal the other end in the flow direction of the flow velocity control path 16.

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

[0034] [How to use the flow cell] The flow cell 1' according to this embodiment is used by connecting the inflow channel 14 to another upstream channel and connecting the outflow channel 15 to another downstream channel. Liquid flowing into the inflow channel 14 from another upstream channel flows through the internal space IS, the flow rate control channel 16, and the outflow channel 15, and then flows into the other downstream channel.

[0035] Furthermore, while the liquid is flowing through the flow rate control path 16, the light emitter 30 irradiates light onto the liquid flowing through the flow rate control path 16, and the light receiver 40 receives the light that has passed through the liquid flowing through the flow rate control path 16. The light quantity value (measured value) received by the light receiver 40 is transmitted to, for example, a control device (not shown), and the control device determines the water quality, such as turbidity and chromaticity, of the liquid that has flowed through the flow cell 1′.

[0036] [Advantages of the flow cell according to this embodiment] Thus, the flow cell 1' of this embodiment comprises a container body 10' having a liquid inlet 14a and outlet 15a, and a flow rate control path 16 provided in the region between the inlet 14a and outlet 15a, a light-emitting unit 30 capable of irradiating light toward the liquid flowing through the flow rate control path 16, and a light-receiving unit 40 that receives the light emitted from the light-emitting unit 30, and the flow rate control path 16 has a control path inlet 16a through which the liquid flowing in from the inlet 14a flows, and a control path outlet 16b through 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] In the flow cell 1' having such a configuration, the opening area of ​​the control path inlet 16a and the opening area of ​​the control path outlet 16b are equal, so the flow rate of the liquid does not change in the flow rate control path 16. This prevents turbulence and pressure fluctuations in the flow rate control path 16, which has the advantage of suppressing or avoiding measurement problems caused by the generation or passage of bubbles. The flow cell 1' according to this embodiment is also suitable for use in measuring liquids with relatively high flow rates (liquids with flow rates faster than 100 mL / min to 250 mL / min).

[0038] Furthermore, according to the flow cell 1' having the above-described configuration, since the container body 10' has the flow rate control path 16, there is no need to provide a separate pipe for measurement, and there is also the advantage that continuous measurement is possible. That is, in conventional flow cells, after liquid is allowed to flow into the container body and stored therein, measurement is performed by the light receiving unit (sensor) with the liquid flow rate stabilized, but in the flow cell 1' according to this embodiment, the steps of storing liquid and stabilizing the flow rate can be omitted, and continuous measurement is possible.

[0039] In the flow cell 1' according to this embodiment, the light-emitting unit 30 is provided at one end of the flow rate control path 16 in the flow direction, and the light-receiving unit 40 is provided at the other end of the flow rate control path 16 in the flow direction. In the flow cell 1' having such a configuration, the light-emitting unit 30 and the light-receiving unit 40 are provided in the flow rate control path 16, and light is directly irradiated onto and received by the liquid flowing through the flow rate control path 16 (i.e., light is not irradiated onto or received through the side wall 13 or the like), which has the advantage that, for example, it is possible to measure liquids with low turbidity or low chromaticity and to distinguish slight differences in turbidity or chromaticity, and thus measurement accuracy is significantly improved compared to conventional flow cells in which the light-emitting unit and the light-receiving unit are attached to the outer surfaces of the container body.

[0040] In the flow cell 1' according to this embodiment, the cross-sectional area of ​​the flow rate control channel 16 is equal to the opening area of ​​the control channel inlet 16a and the opening area of ​​the control channel outlet 16b. The flow cell 1' having such a configuration has the advantage of being able to suppress or avoid measurement problems caused by the generation of bubbles in the flow rate control channel 16 or the passage of bubbles.

[0041] In the flow cell 1' according to this embodiment, the cross-sectional area of ​​the flow rate control channel 16 is equal to the opening area of ​​at least one of the inlet 14a and the outlet 15a. The flow cell 1' having such a configuration has the advantage of further suppressing the generation and retention of bubbles in the flow rate control channel 16.

[0042] In the flow cell 1' according to this embodiment, the container body 10' includes a light-emitting unit-side mounting portion 19 to which the light-emitting unit 30 can be attached and a light-receiving unit-side mounting portion 20 to which the light-receiving unit 40 can be attached. The light-emitting unit-side mounting portion 19 has a through-hole 19a that exposes the light-emitting unit 30 within the flow rate control path 16, and the light-receiving unit-side mounting portion 20 has a through-hole 20a that exposes the light-receiving unit 40 within the flow rate control path 16. With this configuration, the light-emitting unit 30 and the light-receiving unit 40 are exposed within the flow rate control path 16, enabling measurement of, for example, low-turbidity or low-chromaticity liquids and discriminating between slight differences in turbidity or chromaticity. This significantly improves measurement accuracy compared to conventional flow cells in which the light-emitting unit and the light-receiving unit are attached to the outer surface of the container body. Furthermore, the light-emitting unit 30 and the light-receiving unit 40 are detachable from the container body 10', which also provides the advantage of easy replacement of the light-emitting unit 30 and the light-receiving unit 40 in the event of malfunction, etc.

[0043] [Variations] The flow cell according to the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the technical concept of the present invention.

[0044] For example, in the above-described embodiment, the light-emitting unit 30 is provided at one end of the flow velocity control path 16 in the flow direction, and the light-receiving unit 40 is provided at the other end of the flow velocity control path 16 in the flow direction, but this is not limited to this and the units may be provided at any position.

[0045] Furthermore, in the above-described embodiment, only one light-emitting unit 30 is provided, but 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 of the flow velocity control path 16 in the flow path direction, and the other light-emitting unit 30 (second light-emitting unit) may be provided on an inner surface of the flow velocity control path 16 that is perpendicular to the flow path direction. Providing two or more light-emitting units 30 (first light-emitting unit and second light-emitting unit) has the advantage of being able to identify not only the water quality, such as the turbidity and chromaticity, of the liquid that has flowed through the flow velocity control path 16, but also slight differences and changes in low turbidity to low chromaticity.

[0046] Furthermore, in the above-described embodiment, the flow path cross-sectional area of ​​the flow rate control path 16 is described as being equal to the opening area of ​​the control path inlet 16a and the opening area of ​​the control path outlet 16b, but this is not limited to this and may be configured as being unequal.

[0047] In addition, in the above-described embodiment, the flow path cross-sectional area of ​​the flow rate control path 16 is described as being equal to the opening area of ​​at least one of the inlet 14a and the outlet 15a, but this is not limited to this and may be configured as being unequal.

[0048] Furthermore, in the above-described embodiment, the light-emitting unit 30 and the light-receiving unit 40 are each described as being exposed within the flow velocity control path, but this is not limiting, and the light-emitting unit 30 and the light-receiving unit 40 may each not be exposed within the flow velocity control path 16. In other words, the light-emitting unit 30 and the light-receiving unit 40 may each be provided on the outer surface of the side wall portion 13.

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

[0050] Furthermore, in the above-described embodiment, the flow rate control path 16 is described as being formed in a cylindrical shape having an internal space that allows the liquid to flow, but this is not limited to this. For example, the flow rate control path 16 may have two plate-shaped partitions extending from the front wall portion of the container body 10' to the rear wall portion RW, and the two partitions may be arranged at different heights.

[0051] Furthermore, in the above-described embodiment, the container body 10' has been described as having the inflow channel 14 and the outflow channel 15, but this is not limited thereto. For example, as in 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 channel 14 and the outflow channel 15, but the inlet 14a may be formed directly in the bottom plate portion 11 and the outlet 15a may be formed directly 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 channel 14 and the outflow channel 15, similar to the flow cell 1' shown in FIG. 1.

[0052] The following describes the configurations of the flow cell 1'' shown in FIG. 2 and the flow cell 1''' shown in FIG. 3 that differ from the flow cell 1' shown in FIG.

[0053] The flow cell 1'' shown in Figure 2 and the flow cell 1''' shown in Figure 3 differ from the flow cell 1' shown in Figure 1 in that the inlet 14a is formed at one longitudinal end of the bottom plate portion 11 (the left end in Figures 2 and 3), the outlet 15a is formed at the end of the top plate portion 12 opposite the longitudinal end where the inlet 14a is located (the right end in Figures 2 and 3), and the flow rate control path 16 is formed extending from the bottom plate portion 11 toward the top plate portion 12. With this configuration, air bubbles generated when liquid flows into the internal space IS of the container body 10' from the inlet 14a and solid matter contained in the liquid are removed before the liquid flows into the control path inlet 16a of the flow rate control path 16 (i.e., the air bubbles and solid matter rise in the internal space IS of the container body 10', move toward the top plate portion 12, and are discharged to the outside of the flow cell 1" (or flow cell 1'") from the communicating outlet 15a), which has the advantage of suppressing or avoiding measurement problems due to the generation of air bubbles in the flow rate control path 16 or the passage of air bubbles, thereby reducing measurement errors in the light-receiving unit 40 (sensor). Note that, although the flow rate control path 16 is provided at an angle relative to the height direction in the flow cell 1" shown in FIG. 2 and the flow cell 1"' shown in FIG. 3, it may also be provided along the height direction.

[0054] In the flow cell 1'' shown in Figure 2 and the flow cell 1''' shown in Figure 3, air bubbles removed before liquid flows into the control path inlet 16a of the flow rate control path 16 are discharged from the outlet 15a. In addition to this, for example, the container body 10' may have a vent hole that can discharge air bubbles, and the discharge may be performed in addition to the discharge from the outlet 15a.

[0055] The flow cell 1" shown in FIG. 2 and the flow cell 1'" shown in FIG. 3 differ from the flow cell 1' shown in FIG. 1 in that one of the light-emitting unit 30 and the light-receiving unit 40 provided downstream of the flow rate control path 16 is provided at a different height from the other of the light-emitting unit 30 and the light-receiving unit 40 provided upstream of the flow rate control path 16. In the flow cell 1" shown in FIG. 2 and the flow cell 1'" shown in FIG. 3, the light-receiving unit 40 is provided at a higher position than the light-emitting unit 30. With this configuration, the flow rate control path 16 is formed from the bottom plate portion 11 toward the top plate portion 12, which has the advantage of allowing air bubbles and solid matter to be removed before the liquid flows into the control path inlet 16a of the flow rate control path 16, as described above.

[0056] The flow cell 1''' shown in FIG. 3 differs from the flow cell 1' shown in FIG. 1 in that it has multiple flow rate control paths 16, light emitters 30, and light receivers 40 (two in the example shown in FIG. 3). This configuration has the advantage of being able to more accurately identify the water quality, such as the turbidity and color of the liquid flowing through the flow rate control paths 16, as well as slight differences and changes in low turbidity to low color, by utilizing differences in measurement values ​​due to differences in optical path length and light source. In the flow cell 1''' shown in FIG. 3, the flow path lengths of the flow rate control paths 16 are different, but they may also be the same.

[0057] It is clear from the claims that the above-mentioned modifications are included within the scope of the present invention. [Explanation of symbols]

[0058] 1': Flow cell 1'': Flow cell 1'': Flow cell 10': Container body 11:Bottom plate part 12: Top plate 13: Side wall 14:Inflow channel 14a:Inlet 15:Outflow channel 15a: Outlet 16: Flow rate control path 16a: Control path inlet 16b: Control path outlet 17: First connecting road 18: Second connecting road 19: Light-emitting unit side attachment part 19a: Through hole 20: Light receiving part side attachment part 20a: Through hole 30: Light emitting part 40: Light receiving part IS: interior space RW: Rear wall

Claims

1. a container body having an inlet and an outlet for a liquid, an internal space communicating with the inlet and the outlet, and a flow rate control path provided in the internal space; 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 unit is provided at the other end of the flow velocity control path in the flow path direction. The flow cell of claim 1 .

3. The flow path cross-sectional area of ​​the flow velocity control path is equal to the opening area of ​​the control path inlet and the opening area of ​​the control path outlet. The flow cell according to claim 1 or 2.

4. The flow path 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. The 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 in height from the other of the light-emitting unit and the light-receiving unit provided on the upstream side of the flow velocity control path. The flow cell of claim 2 .

6. the container body has a light-emitting unit-side mounting part to which the light-emitting unit can be attached and a light-receiving unit-side mounting part to which the light-receiving unit can be attached, the light-emitting unit side attachment portion has a through hole that exposes the light-emitting unit within the flow velocity control path, The light receiving unit side mounting part has a through hole that exposes the light receiving unit in the flow rate control path. The flow cell according to claim 1 or 2.

7. The container body has a plurality of the flow rate control paths. The flow cell according to claim 1 or 2.

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