Photosynthetic rate detection device

Abstract

The utility model relates to a photosynthetic rate detection device relates to photosynthetic rate detection technical field, the device includes gas transmission unit, first concentration detection unit, second concentration detection unit, detection chamber and control unit, gas transmission unit is communicated with detection chamber through first concentration detection unit, and detection chamber is communicated with gas transmission unit through second concentration detection unit, gas transmission unit, first concentration detection unit, second concentration detection unit and detection chamber form gas passage between, gas transmission unit, first concentration detection unit and second concentration detection unit are connected with control unit respectively. The photosynthetic rate detection device in the utility model can send air to the gas passage in through gas transmission unit, to supplement the carbon dioxide consumed in the detection chamber, to reduce the influence of the carbon dioxide concentration reduction in the detection chamber to the photosynthetic rate of plant, to improve the accuracy of the photosynthetic rate of detection.

Description

Technical Field

[0001] This utility model relates to the field of photosynthetic rate detection technology, specifically, to a photosynthetic rate detection device. Background Technology

[0002] Photosynthesis is one of the most important chemical reactions on Earth, and the energy converted through photosynthesis is fundamental to life on Earth. Currently, photosynthetic rate detection devices are mainly used to measure the photosynthetic rate of plants, and the detected photosynthetic rate is used to study plant photosynthesis.

[0003] Existing photosynthetic rate detection devices place plants in a closed detection chamber and calculate the photosynthetic rate by measuring the plant's consumption of carbon dioxide. However, in reality, due to the plant's photosynthesis, the carbon dioxide concentration in the detection chamber gradually decreases, reducing the plant's photosynthetic rate and thus leading to low accuracy in the measured photosynthetic rate. Summary of the Invention

[0004] The purpose of this invention is to provide a photosynthetic rate detection device to solve the problem of low accuracy in detecting photosynthetic rate in existing photosynthetic rate detection devices.

[0005] According to a first aspect of the present invention, a photosynthetic rate detection device is provided, the photosynthetic rate detection device comprising a gas transmission unit, a first concentration detection unit, a second concentration detection unit, a detection chamber, and a control unit; The target plant is placed inside the detection chamber; the gas transmission unit is connected to the detection chamber through the first concentration detection unit, and the detection chamber is connected to the gas transmission unit through the second concentration detection unit; A gas passage is formed between the gas transmission unit, the first concentration detection unit, the second concentration detection unit, and the detection chamber; the gas transmission unit, the first concentration detection unit, and the second concentration detection unit are respectively connected to the control unit; The gas transmission unit is used to circulate the gas in the gas passage and to deliver air into the gas passage. The first concentration detection unit is used to detect the gas concentration of the gas entering the detection chamber, obtain the first gas concentration corresponding to each detection time, and send the first gas concentration to the control unit; The second concentration detection unit is used to detect the gas concentration of the gas discharged from the detection chamber, obtain the second gas concentration corresponding to each detection time, and send the second gas concentration to the control unit; The control unit is used to determine the photosynthetic rate of the target plant.

[0006] Optionally, the photosynthetic rate detection device further includes a flow rate detection unit; the gas transmission unit is connected to the first concentration detection unit through the flow rate detection unit, and the flow rate detection unit is connected to the control unit; The flow rate detection unit is used to detect the gas flow rate in the gas passage at each detection time and send the gas flow rate to the control unit.

[0007] Optionally, the gas transmission unit includes a gas pump and a control valve; the gas pump is connected to the control unit. The first air inlet of the air pump is connected to the second concentration detection unit, the second air inlet of the air pump is connected to the control valve, and the exhaust port of the air pump is connected to the flow rate detection unit. When the control valve is open, the air pump is connected to the atmosphere.

[0008] Optionally, the air pump is configured to start pumping air after receiving a detection command sent by the control unit, so that the gas in the gas passage circulates within the gas passage; The control valve is used to open according to a preset cycle after the air pump starts pumping air; When the air pump is pumping air and the control valve is open, the air pump delivers air into the gas passage.

[0009] Optionally, the control valve is connected to the control unit; The air pump is used to start pumping air after receiving a detection command sent by the control unit, so that the gas in the gas passage circulates in the gas passage. The control valve is used to open for a preset time after receiving a gas replenishment command sent by the control unit; When the air pump is pumping air and the control valve is open, the air pump delivers air into the gas passage.

[0010] Optionally, the control unit is configured to send the air replenishment command to the control valve at the target detection time; The target detection time is the detection time when the difference between the corresponding first gas concentration and the corresponding second gas concentration is less than or equal to a preset concentration threshold.

[0011] Optionally, the photosynthetic rate detection device further includes a plant identification unit; the plant identification unit is disposed inside the detection chamber and is connected to the control unit; The plant identification unit is used to identify the plant type information of the target plant and send the plant type information to the control unit so that the control unit can determine the preset concentration threshold based on the plant type information.

[0012] Optionally, the testing chamber includes a main body and a roof; The main body of the detection chamber is inserted into the soil where the target plant is located; both the main body of the detection chamber and the roof are made of light-transmitting material. With the top of the chamber fastened to the top of the main body of the testing chamber, the top of the chamber and the main body of the testing chamber form a sealed space.

[0013] The photosynthetic rate detection device provided by this utility model, through the above technical solution, includes a gas transmission unit, a first concentration detection unit, a second concentration detection unit, a detection chamber, and a control unit. The gas transmission unit is connected to the detection chamber through the first concentration detection unit, and the detection chamber is connected to the gas transmission unit through the second concentration detection unit. A gas passage is formed between the gas transmission unit, the first concentration detection unit, the second concentration detection unit, and the detection chamber. The gas transmission unit, the first concentration detection unit, and the second concentration detection unit are respectively connected to the control unit. The photosynthetic rate detection device of this utility model can use the gas transmission unit to deliver air into the gas passage to replenish the carbon dioxide consumed in the detection chamber, thereby reducing the impact of the decrease in carbon dioxide concentration in the detection chamber on the photosynthetic rate of the plant and improving the accuracy of the detected photosynthetic rate.

[0014] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a photosynthetic rate detection device according to an exemplary embodiment; Figure 2 This is a schematic diagram of another photosynthetic rate detection device according to an exemplary embodiment; Figure 3 This is a schematic diagram of the structure of another photosynthetic rate detection device according to an exemplary embodiment; Figure 4 It is based on Figure 1 A schematic diagram of the structure of a testing chamber is shown. Detailed Implementation

[0016] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0017] Figure 1 This is a schematic diagram illustrating the structure of a photosynthetic rate detection device according to an exemplary embodiment. Figure 1 As shown, the photosynthetic rate detection device 10 includes a gas transmission unit 11, a first concentration detection unit 12, a second concentration detection unit 13, a detection chamber 14, and a control unit 15.

[0018] The target plant is placed inside the detection chamber 14. The gas transmission unit 11 is connected to the detection chamber 14 through the first concentration detection unit 12, and the detection chamber 14 is connected to the gas transmission unit 11 through the second concentration detection unit 13.

[0019] A gas passage is formed between the gas transmission unit 11, the first concentration detection unit 12, the second concentration detection unit 13, and the detection chamber 14. The gas transmission unit 11, the first concentration detection unit 12, and the second concentration detection unit 13 are respectively connected to the control unit 15.

[0020] The gas transmission unit 11 is used to circulate the gas in the gas passage and to deliver air into the gas passage.

[0021] The first concentration detection unit 12 is used to detect the gas concentration of the gas entering the detection chamber 14, obtain the first gas concentration corresponding to each detection time, and send the first gas concentration to the control unit 15.

[0022] The second concentration detection unit 13 is used to detect the gas concentration of the gas discharged from the detection chamber 14, obtain the second gas concentration corresponding to each detection time, and send the second gas concentration to the control unit 15.

[0023] Control unit 15 is used to determine the photosynthetic rate of the target plant.

[0024] For example, when it is necessary to detect the photosynthetic rate of a target plant, the target plant can be placed inside the detection chamber 14, where the gas composition is the same as that of air (this is to make the environment of the target plant closer to the natural environment, thus ensuring the accuracy of the photosynthetic rate detection). In the initial stage of photosynthetic rate detection by the photosynthetic rate detection device 10, the carbon dioxide concentration in the detection chamber 14 does not decrease significantly. The gas transmission unit 11 performs gas transmission to circulate the gas within the gas passage. As the detection time progresses, the carbon dioxide concentration in the detection chamber 14 gradually decreases. The gas transmission unit 11 can then perform gas transmission, circulating the gas within the gas passage while simultaneously introducing air from the atmosphere to replenish the carbon dioxide consumed in the detection chamber 14 (this can be understood as refreshing the gas in the detection chamber 14 with newly introduced air, making the gas inside the detection chamber 14 closer to its initial state). This reduces the impact of the decrease in carbon dioxide concentration in the detection chamber 14 on the photosynthetic rate of the target plant, thereby improving the accuracy of the detected photosynthetic rate.

[0025] During the gas circulation process, the first concentration detection unit 12 detects the gas concentration entering the detection chamber 14 and sends the first gas concentration corresponding to each detection moment to the control unit 15. The second concentration detection unit 13 detects the gas concentration exiting the detection chamber 14 and sends the second gas concentration corresponding to each detection moment to the control unit 15. After receiving the first and second gas concentrations, the control unit 15 can calculate the carbon dioxide consumption of the target plant at each detection moment based on the first and second gas concentrations, and calculate the total carbon dioxide consumption for the entire detection cycle based on the carbon dioxide consumption at each detection moment. Then, using the total carbon dioxide consumption for the entire detection cycle, the photosynthetic rate of the target plant is determined. The first and second concentration detection units 12 and 13 can be gas analyzers, and the first and second gas concentrations are carbon dioxide concentrations.

[0026] In summary, the photosynthetic rate detection device provided in this embodiment includes a gas transmission unit, a first concentration detection unit, a second concentration detection unit, a detection chamber, and a control unit. The gas transmission unit is connected to the detection chamber via the first concentration detection unit, and the detection chamber is connected to the gas transmission unit via the second concentration detection unit. A gas passage is formed between the gas transmission unit, the first concentration detection unit, the second concentration detection unit, and the detection chamber. The gas transmission unit, the first concentration detection unit, and the second concentration detection unit are respectively connected to the control unit. The photosynthetic rate detection device of this invention can use the gas transmission unit to deliver air into the gas passage to replenish the carbon dioxide consumed in the detection chamber, thereby reducing the impact of decreased carbon dioxide concentration in the detection chamber on the photosynthetic rate of the plant and improving the accuracy of the detected photosynthetic rate.

[0027] Figure 2 This is a schematic diagram illustrating the structure of another photosynthetic rate detection device according to an exemplary embodiment. For example... Figure 2 As shown, the photosynthetic rate detection device 10 also includes a flow rate detection unit 16. The gas transmission unit 11 is connected to the first concentration detection unit 12 through the flow rate detection unit 16, and the flow rate detection unit 16 is connected to the control unit 15.

[0028] The flow rate detection unit 16 is used to detect the gas flow rate in the gas passage at each detection time and send the gas flow rate to the control unit 15.

[0029] For example, after receiving the first gas concentration and the second gas concentration, the control unit 15 can, for each detection time, calculate the carbon dioxide consumption of the target plant at that detection time based on the first gas concentration, the second gas concentration, and the gas flow rate at that detection time, using a first preset formula. The first preset formula can be expressed as: A i = F i ·(C 1i -C 2i A i Let C be the carbon dioxide consumption at the i-th detection time. 1i Let C be the concentration of the first gas at the i-th detection time. 2i Let F be the concentration of the second gas at the i-th detection time. i Let V be the gas flow rate at the i-th detection time, where i = 1, 2, 3, ... Then, the control unit 15 can calculate the total carbon dioxide consumption for the entire detection cycle based on the carbon dioxide consumption at each detection time. Using this total carbon dioxide consumption for the entire detection cycle, and employing the second preset formula, the photosynthetic rate of the target plant can be determined. The second preset formula can be expressed as: V = ∑F i / s, V is the photosynthetic rate of the target plant, ∑Fi s represents the total carbon dioxide consumption during the entire detection period, and s represents the total leaf area of ​​the target plant.

[0030] Optionally, the gas transmission unit 11 may include an air pump 111 and a control valve 112. The air pump 111 is connected to the control unit 15.

[0031] The first air inlet 1111 of the air pump 111 is connected to the second concentration detection unit 13, the second air inlet 1112 of the air pump 111 is connected to the control valve 112, and the exhaust port 1113 of the air pump 111 is connected to the flow rate detection unit 16. When the control valve 112 is open, the air pump 111 is connected to the atmosphere.

[0032] The air pump 111 is used to start pumping air after receiving a detection command sent by the control unit 15, so that the gas in the gas passage circulates in the gas passage.

[0033] The control valve 112 is used to open according to a preset cycle after the air pump 111 starts pumping air.

[0034] When the air pump 111 pumps air and the control valve 112 is open, the air pump 111 delivers air into the gas passage.

[0035] In one scenario, the gas transfer unit 11 may include an air pump 111 and a control valve 112 connected to the control unit 15. Initially, during the photosynthetic rate detection of the target plant by the photosynthetic rate detection device 10, the control unit 15 may send a detection command to the air pump 111 to start pumping air. At this time, the control valve 112 is closed, and the air pump 111 does not deliver air into the gas passage; it only circulates the gas within the gas passage. After the air pump 111 starts pumping air, the control valve 112 may open according to a preset cycle (for example, after the air pump 111 starts pumping air, the control valve 112 may open once every ten minutes, for one minute each time). When the air pump 111 is pumping air and the control valve 112 is open, the air pump 111 is connected to the atmosphere. The air pump 111 not only circulates the gas within the gas passage but also delivers air from the atmosphere into the gas passage for circulation.

[0036] Optionally, the control valve 112 can be connected to the control unit 15.

[0037] The air pump 111 is used to start pumping air after receiving a detection command sent by the control unit 15, so that the gas in the gas passage circulates in the gas passage.

[0038] The control valve 112 is used to open for a preset time after receiving a gas replenishment command sent by the control unit 15.

[0039] When the air pump 111 pumps air and the control valve 112 is open, the air pump 111 delivers air into the gas passage.

[0040] In another scenario, the control unit 15 can determine the photosynthetic capacity of the target plant by comparing the concentrations of a first gas and a second gas. When a significant decrease in the target plant's photosynthetic capacity is detected, the control unit 15 can actively send a gas replenishment command to the control valve 112, causing the control valve 112 to open for a preset duration. Specifically, the control unit 15 can send the gas replenishment command to the control valve 112 at a target detection time. The target detection time is defined as the detection time when the difference between the corresponding first gas concentration and the corresponding second gas concentration is less than or equal to a preset concentration threshold. If the difference between the first gas concentration and the corresponding second gas concentration at a certain time is less than or equal to the preset concentration threshold, it indicates that the amount of carbon dioxide consumed by the target plant through photosynthesis has decreased significantly at that time. In other words, the photosynthetic capacity of the target plant has decreased significantly due to the reduced carbon dioxide concentration in the detection chamber 14, requiring replenishment of the carbon dioxide consumed in the detection chamber 14.

[0041] It should be noted that, to avoid excessive air supply causing a significant increase in air pressure within the gas passage, the opening time of control valve 112 should not be too long, and the air pump speed should not be too high. Alternatively, the air pressure within the gas passage can be regulated by stopping the air pump and opening control valve 112.

[0042] Figure 3 This is a schematic diagram illustrating the structure of yet another photosynthetic rate detection device according to an exemplary embodiment. For example... Figure 3 As shown, the photosynthetic rate detection device 10 also includes a plant identification unit 17. The plant identification unit 17 is located inside the detection chamber 14 and is connected to the control unit 15.

[0043] The plant identification unit 17 is used to identify the plant type information of the target plant and send the plant type information to the control unit 15 so that the control unit 15 can determine the preset concentration threshold based on the plant type information.

[0044] For example, in practice, different types of plants have varying photosynthetic capacities. To further improve the accuracy of photosynthetic rate detection, it is necessary to more accurately determine whether the photosynthetic capacity of the target plant has significantly decreased. Therefore, a plant identification unit 17 can be installed inside the detection chamber 14. The plant identification unit 17 identifies the target plant and sends the identified plant type information to the control unit 15, so that the control unit 15 can determine a preset concentration threshold based on the plant type information. For example, the control unit 15 can have a pre-set relationship table between plant types and preset concentration thresholds. When the control unit 15 obtains the plant type information, it can determine the preset concentration threshold based on the plant type of the target plant indicated by the plant type information and according to the relationship table.

[0045] Figure 4 It is based on Figure 1 A schematic diagram of a testing chamber is shown. Figure 4 As shown, the testing chamber 14 includes a main body 141 and a roof 142.

[0046] The main body 141 of the testing chamber is inserted into the soil where the target plant is located. Both the main body 141 and the roof 142 of the testing chamber are made of light-transmitting material.

[0047] With the top of the chamber 142 fastened to the top of the main body 141 of the testing chamber, the top of the chamber 142 and the main body 141 of the testing chamber form a sealed space.

[0048] For example, in practice, photosynthetic rate measurements of the target plant are often required multiple times to ensure accuracy. However, if the target plant is kept in a closed space for a long period, its photosynthetic capacity will be affected, leading to inaccurate test results. To avoid this, a retractable testing chamber 14 can be used. When photosynthetic rate measurements are not required, the testing chamber 14 can be opened, placing the target plant in an open space to avoid affecting the accuracy of the photosynthetic rate measurements.

[0049] Specifically, the testing chamber 14 includes a main body 141 and a roof 142. To make the environment of the target plant closer to its natural state, the main body 141 can be inserted into the soil where the target plant is located, allowing the photosynthetic rate to be measured under natural growth conditions. Both the main body 141 and the roof 142 can be made of light-transmitting material, allowing the target plant to be directly exposed to natural light. Before measuring the photosynthetic rate of the target plant, the roof 141 can be fastened to the top of the main body 141, creating a sealed space. After the photosynthetic rate measurement is completed, the roof 141 can be removed from the main body 141.

[0050] In summary, the photosynthetic rate detection device provided in this embodiment includes a gas transmission unit, a first concentration detection unit, a second concentration detection unit, a detection chamber, and a control unit. The gas transmission unit is connected to the detection chamber via the first concentration detection unit, and the detection chamber is connected to the gas transmission unit via the second concentration detection unit. A gas passage is formed between the gas transmission unit, the first concentration detection unit, the second concentration detection unit, and the detection chamber. The gas transmission unit, the first concentration detection unit, and the second concentration detection unit are respectively connected to the control unit. The photosynthetic rate detection device of this invention can use the gas transmission unit to deliver air into the gas passage to replenish the carbon dioxide consumed in the detection chamber, thereby reducing the impact of decreased carbon dioxide concentration in the detection chamber on the photosynthetic rate of the plant and improving the accuracy of the detected photosynthetic rate.

[0051] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0052] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0053] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A photosynthetic rate detection device, characterized in that, The photosynthetic rate detection device includes a gas transmission unit, a first concentration detection unit, a second concentration detection unit, a detection chamber, and a control unit; The target plant is placed inside the detection chamber; the gas transmission unit is connected to the detection chamber through the first concentration detection unit, and the detection chamber is connected to the gas transmission unit through the second concentration detection unit; A gas passage is formed between the gas transmission unit, the first concentration detection unit, the second concentration detection unit, and the detection chamber; the gas transmission unit, the first concentration detection unit, and the second concentration detection unit are respectively connected to the control unit; The gas transmission unit is used to circulate the gas in the gas passage and to deliver air into the gas passage. The first concentration detection unit is used to detect the gas concentration of the gas entering the detection chamber, obtain the first gas concentration corresponding to each detection time, and send the first gas concentration to the control unit; The second concentration detection unit is used to detect the gas concentration of the gas discharged from the detection chamber, obtain the second gas concentration corresponding to each detection time, and send the second gas concentration to the control unit; The control unit is used to determine the photosynthetic rate of the target plant.

2. The photosynthetic rate detection device according to claim 1, characterized in that, The photosynthetic rate detection device further includes a flow rate detection unit; the gas transmission unit is connected to the first concentration detection unit through the flow rate detection unit, and the flow rate detection unit is connected to the control unit; The flow rate detection unit is used to detect the gas flow rate in the gas passage at each detection time and send the gas flow rate to the control unit.

3. The photosynthetic rate detection device according to claim 2, characterized in that, The gas transmission unit includes a gas pump and a control valve; the gas pump is connected to the control unit. The first air inlet of the air pump is connected to the second concentration detection unit, the second air inlet of the air pump is connected to the control valve, and the exhaust port of the air pump is connected to the flow rate detection unit. When the control valve is open, the air pump is connected to the atmosphere.

4. The photosynthetic rate detection device according to claim 3, characterized in that, The air pump is used to start pumping air after receiving a detection command sent by the control unit, so that the gas in the gas passage circulates in the gas passage. The control valve is used to open according to a preset cycle after the air pump starts pumping air; When the air pump is pumping air and the control valve is open, the air pump delivers air into the gas passage.

5. The photosynthetic rate detection device according to claim 3, characterized in that, The control valve is connected to the control unit; The air pump is used to start pumping air after receiving a detection command sent by the control unit, so that the gas in the gas passage circulates in the gas passage. The control valve is used to open for a preset time after receiving a gas replenishment command sent by the control unit; When the air pump is pumping air and the control valve is open, the air pump delivers air into the gas passage.

6. The photosynthetic rate detection device according to claim 5, characterized in that, The control unit is used to send the air replenishment command to the control valve at the time of target detection; The target detection time is the detection time when the difference between the corresponding first gas concentration and the corresponding second gas concentration is less than or equal to a preset concentration threshold.

7. The photosynthetic rate detection device according to claim 6, characterized in that, The photosynthetic rate detection device further includes a plant identification unit; the plant identification unit is disposed inside the detection chamber and is connected to the control unit. The plant identification unit is used to identify the plant type information of the target plant and send the plant type information to the control unit so that the control unit can determine the preset concentration threshold based on the plant type information.

8. The photosynthetic rate detection device according to any one of claims 1-7, characterized in that, The testing chamber includes a main body and a ceiling; The main body of the detection chamber is inserted into the soil where the target plant is located; both the main body of the detection chamber and the roof are made of light-transmitting material. With the top of the chamber fastened to the top of the main body of the testing chamber, the top of the chamber and the main body of the testing chamber form a sealed space.

Images