Photosynthetic rate detector

Abstract

The utility model relates to a photosynthetic rate detector, which relates to the technical field of photosynthesis detection, and comprises an air conveying assembly, a flow meter, a leaf chamber, a pipeline switching assembly, a first detection assembly, a second detection assembly and a controller, the air conveying assembly is connected with the flow meter through a first gas pipeline, and the flow meter is connected with the first detection assembly through the leaf chamber; the air conveying assembly is connected with the pipeline switching assembly through the second gas pipeline, and the first detection assembly and the second detection assembly are connected with the pipeline switching assembly. According to the photosynthetic rate detector disclosed by the utility model, air path switching can be performed through the air conveying assembly and the pipeline switching assembly, so that the first detection assembly detects air which does not pass through a target plant and air which passes through the target plant respectively, the second detection assembly detects the air which does not pass through the target plant, and the photosynthetic rate is detected according to a detection result. And the photosynthetic rate of the target plant considering the detection deviation is obtained, so that the accuracy of detecting the photosynthetic rate is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of photosynthesis detection, and particularly to a photosynthetic rate detector. Background Art

[0002] Photosynthesis provides energy and oxygen for life, maintains the balance of the ecosystem, and is one of the most important chemical reactions on earth. Currently, a photosynthetic rate detector is usually used to detect the photosynthetic rate of plants, and then the photosynthesis of plants is studied based on the detected photosynthetic rate.

[0003] The photosynthetic rate detectors in the prior art mainly adopt an open-circuit detection principle. Two detection components are used to detect the CO2 concentration at the inlet of the leaf chamber and the CO2 concentration at the outlet of the leaf chamber respectively, and the photosynthetic rate of the plant is calculated according to the change amount of the CO2 concentration at the outlet of the leaf chamber compared with that at the inlet of the leaf chamber. However, in actual situations, there will be detection deviations when the two detection components detect the gas concentration (for example, the detection deviation caused by the inconsistent drift directions of the two detection components), which will result in a low accuracy of the photosynthetic rate detector in detecting the photosynthetic rate. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a photosynthetic rate detector, which is used to solve the problem of low accuracy of the current photosynthetic rate detector in detecting the photosynthetic rate.

[0005] According to the first aspect of the embodiment of the utility model, a photosynthetic rate detector is provided. The photosynthetic rate detector includes an air delivery component, a flow meter, a leaf chamber, a pipeline switching component, a first detection component, a second detection component and a controller; the target plant is located inside the leaf chamber;

[0006] The air delivery component is connected to the flow meter through a first gas pipeline, and the flow meter is connected to the first detection component through the leaf chamber; the air delivery component is connected to the pipeline switching component through a second gas pipeline, and the first detection component and the second detection component are respectively connected to the pipeline switching component; the air delivery component, the flow meter, the pipeline switching component, the first detection component and the second detection component are respectively connected to the controller.

[0007] Optionally, the controller is configured to control the pipeline switching component to connect the air delivery component and the first detection component, and the air delivery component and the second detection component after receiving a detection instruction;

[0008] The controller is further configured to control the air delivery component to deliver air to the second gas pipeline, and obtain the first gas concentration detected by the first detection component and the second gas concentration detected by the second detection component;

[0009] The controller is further configured to control the pipeline switching component to stop connecting the air delivery component and the first detection component, control the air delivery component to deliver air to the first gas pipeline and the second gas pipeline, and obtain the third gas concentration detected by the first detection component, the fourth gas concentration detected by the second detection component, and the gas flow rate detected by the flow meter, so as to determine the photosynthetic rate of the target plant according to the first gas concentration, the second gas concentration, the third gas concentration, the fourth gas concentration, and the gas flow rate.

[0010] Optionally, the leaf chamber includes a leaf chamber body, a chamber top, and a driving component;

[0011] The leaf chamber body is inserted into the soil where the target plant is located; a driving component is arranged on the outer wall of the leaf chamber body, the driving component is mechanically connected to the chamber top; the driving component is connected to the controller.

[0012] Optionally, the controller is configured to control the driving component to drive the chamber top to buckle at the top of the leaf chamber body before receiving the detection instruction, so that the chamber top and the leaf chamber body form a sealed space.

[0013] Optionally, the leaf chamber body is of a cylindrical structure; the leaf chamber body is formed by connecting a plurality of cylinders.

[0014] Optionally, the air delivery component includes an air pump and a shunt; the air pump and the shunt are respectively connected to the controller;

[0015] The air pump is communicated with the shunt; the shunt is connected to the flow meter through the first gas pipeline, and the shunt is connected to the pipeline switching component through the second gas pipeline.

[0016] Optionally, the controller is configured to control the air pump to pump air, and control the shunt to deliver the air pumped by the air pump to the first gas pipeline and / or the second gas pipeline.

[0017] Optionally, both the first detection component and the second detection component are gas analyzers; the pipeline switching component is a three-way valve.

[0018] Through the above technical solution, the photosynthetic rate detector provided by the embodiment of the present utility model includes an air delivery component, a flow meter, a leaf chamber, a pipeline switching component, a first detection component, a second detection component, and a controller. The air delivery component is connected to the flow meter through a first gas pipeline, the flow meter is connected to the first detection component through the leaf chamber, the air delivery component is connected to the pipeline switching component through a second gas pipeline, the first detection component and the second detection component are respectively connected to the pipeline switching component, and the air delivery component, the flow meter, the pipeline switching component, the first detection component, and the second detection component are respectively connected to the controller. The photosynthetic rate detector of the present utility model can perform gas path switching through the air delivery component and the pipeline switching component, so that the first detection component respectively detects the air that has not passed through the target plant and the air that has passed through the target plant, the second detection component detects the air that has not passed through the target plant, and according to the detection results, the photosynthetic rate of the target plant considering the detection deviation is obtained, thereby ensuring the accuracy of detecting the photosynthetic rate.

[0019] Other features and advantages of the present utility model will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present utility model, but do not constitute a limitation to the present utility model. In the drawings:

[0021] Figure 1 is a block diagram of a photosynthetic rate detector shown according to an exemplary embodiment;

[0022] Figure 2 is a schematic structural diagram of a leaf chamber shown according to an exemplary embodiment;

[0023] Figure 3 is according to Figure 1 shown in another block diagram of a photosynthetic rate detector. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will describe in detail the specific implementation of the present utility model with reference to the drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present utility model, and is not used to limit the present utility model.

[0025] Figure 1 is a block diagram of a photosynthetic rate detector shown according to an exemplary embodiment. As Figure 1 shown, the photosynthetic rate detector 10 includes an air delivery component 11, a flow meter 12, a leaf chamber 13, a pipeline switching component 14, a first detection component 15, a second detection component 16, and a controller 17. The target plant is located inside the leaf chamber 13.

[0026] The air delivery assembly 11 is connected to the flowmeter 12 through the first gas pipeline 18, and the flowmeter 12 is connected to the first detection assembly 15 through the leaf chamber 13. The air delivery assembly 11 is connected to the pipeline switching assembly 14 through the second gas pipeline 19, and the first detection assembly 15 and the second detection assembly 16 are respectively connected to the pipeline switching assembly 14. The air delivery assembly 11, the flowmeter 12, the pipeline switching assembly 14, the first detection assembly 15 and the second detection assembly 16 are respectively connected to the controller 17.

[0027] Exemplarily, the photosynthetic rate detector 10 may include three gas paths, namely: a calibration gas path, a reference gas path, and a detection gas path. The calibration gas path is a gas path successively composed of the air delivery assembly 11, the pipeline switching assembly 14 and the first detection assembly 15. The reference gas path is a gas path composed of the air delivery assembly 11, the pipeline switching assembly 14 and the second detection assembly 16. The detection gas path is a gas path successively composed of the air delivery assembly 11, the flowmeter 12, the leaf chamber 13 and the first detection assembly 15.

[0028] Among them, both the first detection assembly 15 and the second detection assembly 16 are gas analyzers (for example, gas analyzers based on the principle of infrared gas analysis), and the pipeline switching assembly 14 is a three-way valve. The target plant is placed inside the leaf chamber 13, and the leaf chamber 13 can adopt a transparent structure so that ambient light can directly irradiate the target plant, enabling the target plant to perform photosynthetic rate detection under conditions closer to the natural environment, thereby further improving the accuracy of detecting the photosynthetic rate.

[0029] Optionally, the controller 17 is configured to control the pipeline switching assembly 14 to connect the air delivery assembly 11 to the first detection assembly 15 and the air delivery assembly 11 to the second detection assembly 16 after receiving a detection instruction.

[0030] The controller 17 is further configured to control the air delivery assembly 11 to deliver air to the second gas pipeline 19, and obtain the first gas concentration detected by the first detection assembly 15 and the second gas concentration detected by the second detection assembly 16.

[0031] The controller 17 is further configured to control the pipeline switching assembly 14 to stop connecting the air delivery assembly 11 to the first detection assembly 15, control the air delivery assembly 11 to deliver air to the first gas pipeline 18 and the second gas pipeline 19, and obtain the third gas concentration detected by the first detection assembly 15, the fourth gas concentration detected by the second detection assembly 16 and the gas flow rate detected by the flowmeter 12, so as to determine the photosynthetic rate of the target plant according to the first gas concentration, the second gas concentration, the third gas concentration, the fourth gas concentration and the gas flow rate.

[0032] For example, when it is necessary to detect the photosynthetic rate of a target plant, the user can send a detection instruction to the controller 17. After receiving the detection instruction, the controller 17 can first control the pipeline switching component 14 to connect the air delivery component 11 with the first detection component 15, and at the same time connect the air delivery component 11 with the second detection component 16. Then, it controls the air delivery component 11 to deliver air to the second gas pipeline 19. The pipeline switching component 14 can deliver the air delivered by the second gas pipeline 19 to the first detection component 15 and the second detection component 16 respectively for concentration detection. That is, the air delivered by the air delivery component 11 is divided into two paths. One path of air is discharged along the calibration gas path, and the other path of air is discharged along the reference gas path. During the process of the two paths of air being discharged along the calibration gas path and the reference gas path, the controller 17 can obtain the first gas concentration detected by the first detection component 15 and the second gas concentration detected by the second detection component 16. Among them, the first gas concentration can be understood as the gas concentration obtained by the first detection component 15 detecting the air that has not passed through the target plant (at this time, there is no gas exchange between the air and the target plant), and the second gas concentration can be understood as the gas concentration obtained by the second detection component 16 detecting the air that has not passed through the target plant.

[0033] After obtaining the first gas concentration and the second gas concentration, the controller 17 can control the pipeline switching component 14 to stop connecting the air delivery component 11 with the first detection component 15 (at this time, the air delivery component 11 and the second detection component 16 still remain connected), and then control the air delivery component 11 to deliver air to the first gas pipeline 18 and the second gas pipeline 19 at the same time. At this time, the air delivered by the air delivery component 11 is still divided into two paths. One path of air is discharged along the detection gas path, and the other path of air is discharged along the reference gas path. During the process of the two paths of air being discharged along the detection gas path and the reference gas path, the controller 17 can obtain the third gas concentration detected by the first detection component 15, the fourth gas concentration detected by the second detection component 16, and the gas flow rate detected by the flow meter 12. Among them, the third gas concentration can be understood as the gas concentration obtained by the first detection component 15 detecting the air that has passed through the target plant (at this time, due to the photosynthesis and respiration of the target plant, there will be gas exchange between the air and the target plant), and the fourth gas concentration can be understood as the gas concentration obtained by the second detection component 16 detecting the air that has not passed through the target plant.

[0034] Then, the controller 17 can determine the offset parameter between the first detection component 15 and the second detection component 16 according to the first gas concentration and the second gas concentration. The offset parameter is used to reflect the detection deviation existing between the first detection component 15 and the second detection component 16 when detecting the gas concentration. The offset parameter can be a single concentration offset or a concentration offset curve, and the present invention does not make specific limitations thereto. Then, the controller 17 can correct the fourth gas concentration according to the offset parameter to obtain the fifth gas concentration. Among them, the fifth gas concentration can be understood as: the gas concentration detected by the second detection component 16 for the air that has not passed through the target plant when there is no detection deviation between the first detection component 15 and the second detection component 16.

[0035] Finally, the controller 17 can determine the photosynthetic rate of the target plant according to the third gas concentration, the fifth gas concentration and the gas flow rate. Specifically, the controller 17 can calculate the change amount of the CO2 concentration at the outlet of the leaf chamber 13 compared with the inlet of the leaf chamber 13 (the calculated change amount of the CO2 concentration at this time takes into account the detection deviation) according to the third gas concentration and the fifth gas concentration, and determine the photosynthetic rate of the target plant in combination with the gas flow rate based on the accurate change amount of the CO2 concentration. The photosynthetic rate calculated in this way takes into account the influence of the detection deviation on the detection of the photosynthetic rate and can improve the accuracy of detecting the photosynthetic rate. For example, when the third gas concentration and the fifth gas concentration only include the CO2 concentration in the air, the controller 17 can determine the photosynthetic rate of the target plant according to the third gas concentration, the fifth gas concentration and the gas flow rate by using a preset formula. Among them, the preset formula can be expressed as: , where c1 is the fifth gas concentration, c2 is the third gas concentration, F is the gas flow rate, s is the total leaf area of the target plant, V is the photosynthetic rate of the target plant, and (c1 - c2) is the change amount of the CO2 concentration at the outlet of the leaf chamber 13 compared with the inlet of the leaf chamber 13.

[0036] It should be noted that the first gas concentration, the second gas concentration, the third gas concentration and the fourth gas concentration can only include the CO2 concentration in the air, or can include the concentrations of other gases in the air except CO2, and the present invention does not make specific limitations thereto.

[0037] In summary, the photosynthetic rate detector provided by the embodiment of the present utility model includes an air delivery component, a flow meter, a leaf chamber, a pipeline switching component, a first detection component, a second detection component, and a controller. The air delivery component is connected to the flow meter through a first gas pipeline, the flow meter is connected to the first detection component through the leaf chamber, the air delivery component is connected to the pipeline switching component through a second gas pipeline, the first detection component and the second detection component are respectively connected to the pipeline switching component, and the air delivery component, the flow meter, the pipeline switching component, the first detection component, and the second detection component are respectively connected to the controller. The photosynthetic rate detector of the present utility model can perform gas path switching through the air delivery component and the pipeline switching component, so that the first detection component can respectively detect the air that has not passed through the target plant and the air that has passed through the target plant, the second detection component can detect the air that has not passed through the target plant, and based on the detection results, the photosynthetic rate of the target plant considering the detection deviation can be obtained, thereby ensuring the accuracy of detecting the photosynthetic rate.

[0038] Figure 2 is a schematic structural diagram of a leaf chamber shown according to an exemplary embodiment. As Figure 2 shown, the leaf chamber 13 includes a leaf chamber main body 131, a chamber top 132, and a driving component 133.

[0039] The leaf chamber main body 131 is inserted into the soil where the target plant is located. A driving component 133 is provided on the outer wall of the leaf chamber main body 131, and the driving component 133 is mechanically connected to the chamber top 132. The driving component 133 is connected to the controller 17.

[0040] For example, in actual situations, in order to ensure the accuracy of detection, the photosynthetic rate detector 10 may need to perform photosynthetic rate detection on plants multiple times. If the plants are in a closed space for a long time, it will affect the photosynthesis of the plants and make the detection results inaccurate. To avoid this situation, a leaf chamber with an opening and closing structure can be used to place the plants. When the photosynthetic rate of the plants does not need to be detected, the leaf chamber is opened to make the plants in an open space, so as to avoid affecting the detection results of the photosynthetic rate detector 10.

[0041] Specifically, the leaf chamber 13 may include a leaf chamber main body 131, a chamber top 132, and a driving component 133 mechanically connected to the chamber top 132. The leaf chamber main body 131 is inserted into the soil where the target plant is located, and the driving component 133 may be provided on the outer wall of the leaf chamber main body 131. Before receiving the detection instruction, the controller 17 may control the driving component 133 to drive the chamber top 132 to buckle on the top of the leaf chamber main body 131, so that the chamber top 132 and the leaf chamber main body 131 form a closed space. And after detecting the photosynthetic rate of the target plant, the controller 17 may control the driving component 133 to drive the chamber top 132 to move away from the leaf chamber main body 131.

[0042] Optionally, the leaf chamber body 131 is a cylindrical structure. The leaf chamber body 131 is formed by connecting a plurality of cylinders 1311.

[0043] Specifically, the leaf chamber body 131 may include a plurality of cylinders 1311, and every two adjacent cylinders 1311 are detachably connected (such as threaded connection, snap connection or tape connection, etc.). By adopting the detachable connection mode of a plurality of cylinders 1311, the volume of the leaf chamber 13 can be variable, so that the height of the leaf chamber 13 can be adjusted according to the height of the target plant, so that the photosynthetic rate detector 10 can be applied to more types of plants and has a wider application range.

[0044] Furthermore, at least one ventilation component (the ventilation component may be a fan, for example) may be arranged in the leaf chamber body 131, and each ventilation component is connected to the controller 17. When the chamber top 132 and the leaf chamber body 131 form a sealed space, the controller 17 can control each ventilation component to drive the gas in the leaf chamber body 131 to flow in the leaf chamber body 131, so that the gas in the leaf chamber body 131 is evenly distributed, so that the target plant can be closer to the state under natural conditions, thereby improving the accuracy of detecting the photosynthetic rate. When there are multiple ventilation components, the multiple ventilation components can be evenly spaced at the bottom of the leaf chamber body 131, and each ventilation component forms a preset angle with the inner wall of the leaf chamber body 131. Among them, the preset angle can be 30°-60°.

[0045] Figure 3 is based on Figure 1 Another block diagram of a photosynthetic rate detector is shown. As Figure 3 shown, the air delivery component 11 includes an air pump 111 and a diverter 112. The air pump 111 and the diverter 112 are respectively connected to the controller 17.

[0046] The air pump 111 is communicated with the diverter 112. The diverter 112 is connected to the flow meter 12 through a first gas pipeline 18, and the diverter 112 is connected to the pipeline switching component 14 through a second gas pipeline 19.

[0047] The controller 17 is used to control the air pump 111 to pump air and control the diverter 112 to deliver the air pumped by the air pump 111 to the first gas pipeline 18 and / or the second gas pipeline 19.

[0048] In a scenario, the air delivery assembly 11 may include an air pump 111 and a diverter 112 communicating with the air pump 111. The diverter 112 is connected to the flow meter 12 through a first gas pipeline 18, and the diverter 112 is connected to the pipeline switching assembly 14 through a second gas pipeline 19. The air pump 111 is configured to pump air to the diverter 112 under the control of the controller 17. The diverter 112 is configured to deliver the air pumped by the air pump 111 to the first gas pipeline 18 and / or the second gas pipeline 19 under the control of the controller 17. Additionally, the diverter 112 can also control the flow rate of the air delivered to the first gas pipeline 18 and the second gas pipeline 19. For example, the ratio of the flow rate of the air delivered to the first gas pipeline 18 to the flow rate of the air delivered to the second gas pipeline 19 can be 3:1.

[0049] In summary, the photosynthetic rate detector provided by the embodiment of the present utility model includes an air delivery assembly, a flow meter, a leaf chamber, a pipeline switching assembly, a first detection assembly, a second detection assembly, and a controller. The air delivery assembly is connected to the flow meter through a first gas pipeline, the flow meter is connected to the first detection assembly through the leaf chamber, the air delivery assembly is connected to the pipeline switching assembly through a second gas pipeline, the first detection assembly and the second detection assembly are respectively connected to the pipeline switching assembly, and the air delivery assembly, the flow meter, the pipeline switching assembly, the first detection assembly, and the second detection assembly are respectively connected to the controller. The photosynthetic rate detector of the present utility model can perform air path switching through the air delivery assembly and the pipeline switching assembly, enabling the first detection assembly to detect the air that has not passed through the target plant and the air that has passed through the target plant respectively, enabling the second detection assembly to detect the air that has not passed through the target plant, and obtaining the photosynthetic rate of the target plant considering the detection deviation according to the detection results, thereby ensuring the accuracy of detecting the photosynthetic rate.

[0050] The preferred embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present utility model, various simple modifications can be made to the technical solutions of the present utility model, and these simple modifications all fall within the protection scope of the present utility model.

[0051] In addition, it should be noted that, in the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present utility model will not separately describe various possible combination methods.

[0052] Furthermore, any combination can be made between different embodiments of the present utility model as long as it does not violate the idea of the present utility model, and it should also be regarded as the content disclosed by the present utility model.

Claims

1. A photosynthetic rate detector, characterized in that: The photosynthetic rate detector comprises an air delivery component, a flow meter, a leaf chamber, a pipeline switching component, a first detection component, a second detection component and a controller; the target plant is located inside the leaf chamber; The air delivery component is connected to the flow meter through a first gas pipeline, and the flow meter is connected to the first detection component through the leaf chamber; the air delivery component is connected to the pipeline switching component through a second gas pipeline, and the first detection component and the second detection component are respectively connected to the pipeline switching component; the air delivery component, the flow meter, the pipeline switching component, the first detection component and the second detection component are respectively connected to the controller.

2. The photosynthetic rate detector according to claim 1, characterized in that: The controller is used to control the pipeline switching component to connect the air delivery component with the first detection component, and the air delivery component with the second detection component after receiving the detection instruction; The controller is further used to control the air delivery component to deliver air to the second gas pipeline, and obtain the first gas concentration detected by the first detection component and the second gas concentration detected by the second detection component; The controller is also used to control the pipeline switching component to stop connecting the air delivery component and the first detection component, control the air delivery component to deliver air to the first gas pipeline and the second gas pipeline, and obtain the third gas concentration detected by the first detection component, the fourth gas concentration detected by the second detection component and the gas flow rate detected by the flowmeter, so as to determine the photosynthetic rate of the target plant according to the first gas concentration, the second gas concentration, the third gas concentration, the fourth gas concentration and the gas flow rate.

3. The photosynthetic rate detector according to claim 2, characterized in that: The blade chamber comprises a blade chamber body, a chamber top and a driving assembly; The leaf chamber body is inserted into the soil where the target plant is located; the driving component is arranged on the outer wall of the leaf chamber body, and the driving component is mechanically connected to the chamber top; the driving component is connected to the controller.

4. The photosynthetic rate detector according to claim 3, characterized in that: The controller is used to control the driving component to drive the chamber top to buckle onto the top of the leaf chamber body before receiving the detection instruction, so that the chamber top and the leaf chamber body form a closed space.

5. The photosynthetic rate detector according to claim 3, characterized in that: The leaf chamber body is a cylindrical structure; the leaf chamber body is composed of a plurality of cylinders connected together.

6. The photosynthetic rate detector according to claim 1, characterized in that: The air delivery assembly includes an air pump and a flow divider; the air pump and the flow divider are respectively connected to the controller; The air pump is communicated with the diverter; the diverter is connected to the flow meter through the first gas pipeline, and the diverter is connected to the pipeline switching assembly through the second gas pipeline.

7. The photosynthetic rate detector according to claim 6, characterized in that: The controller is used to control the air pump to pump air, and control the diverter to deliver the air pumped by the air pump to the first gas pipeline and / or the second gas pipeline.

8. The photosynthetic rate detector according to any one of claims 1 to 7, characterized in that: The first detection component and the second detection component are both gas analyzers; the pipeline switching component is a three-way valve.

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