Portable handheld analysis device for measuring photosynthesis of plants

Abstract

The utility model discloses a portable handheld analysis device for measuring plant photosynthesis, which comprises an upper leaf chamber component, a lower leaf chamber component, an air valve component, a handle component, an optical component and an upper cavity component, and the upper leaf chamber component is connected with the lower leaf chamber component in an openable manner; the handle assembly is arranged on one side of the upper leaf chamber assembly and one side of the lower leaf chamber assembly and provided with a handle fixing base fixed to a lower box body of the lower leaf chamber assembly and a pressing handle, the pressing handle is hinged to one end of the handle fixing base, a reset device is arranged in the middle of the pressing handle, and the other end of the pressing handle is hinged to an upper box body of the upper leaf chamber assembly. The top of the upper cavity assembly is connected with the lower box body heat dissipation outer cover. An air valve assembly is arranged at the bottom of the upper cavity assembly; the rear side of the upper cavity assembly is connected with an optical assembly, and two groups of light sources and two groups of detectors are arranged in the optical assembly. The device is convenient to use, reliable in measurement result, free of sunlight and capable of achieving dual-channel measurement.

Description

Technical Field

[0001] The utility model relates to the technical field of plant photosynthesis analysis equipment, in particular to a portable handheld analysis device for measuring plant photosynthesis. Background Art

[0002] Plant photosynthesis is affected by external conditions such as photosynthetically active radiation (light intensity, light time, light quality), environmental temperature and humidity, CO2 concentration, and internal factors such as plant variety, leaf age, and growth period. The photosynthetic rate is closely related to plant yield and has become an important physiological indicator for screening high-yield varieties.

[0003] CO2 concentration, air temperature, humidity, etc. are directly related to the growth, development, and energy exchange of crops in agricultural planting. By analyzing the detected data and combining the growth and development laws of crops, we can control and adjust the environmental conditions to achieve the goal of efficient cultivation, high quality and high yield of crops.

[0004] At present, the photosynthesis measuring instruments in my country usually use the static leaf photosynthetic rate determination method. Its basic measurement principle is to measure the gas exchange in the leaves to evaluate the photosynthesis rate. The most important measurement mode is single-channel and no CO2 concentration change. The measuring device of the existing photosynthetic instrument is mainly concentrated inside the main unit, far away from the leaf surface, which makes the experimental data error large, the experimental data unstable, and the experimental medium loss and other related problems. At present, the existing photosynthetic instrument needs to use natural light (sunlight) to measure photosynthesis, which is greatly affected by natural environmental factors. Utility Model Content

[0005] The utility model aims to provide a portable handheld analysis device for measuring plant photosynthesis which is easy to use, has reliable measurement results, does not rely on sunlight, and performs dual-channel measurement.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A portable handheld analysis device for measuring plant photosynthesis, comprising an upper leaf chamber assembly, a lower leaf chamber assembly, an air valve assembly, a handle assembly, an optical assembly, and an upper cavity assembly, wherein the upper leaf chamber assembly and the lower leaf chamber assembly can be connected in an openable and closable manner; the upper leaf chamber assembly comprises an upper box body, a cooling fan, and a connecting piece, wherein the cooling fan and the connecting piece are arranged on one side of the upper box body, and an upper leaf chamber recessed upwardly toward the box body is arranged on the other side of the upper box body, the cooling fan and the upper leaf chamber are located at one end of the upper box body, and three upper box body air inlets are arranged at the other end of the upper box body, and a first air duct, a second air duct, and a third air duct are arranged in the upper box body to respectively connect the upper leaf chamber and the three upper box body air inlets, and a There is a PCB control board, and the upper leaf chamber is provided with a light source and an illumination sensor; the lower leaf chamber assembly includes a lower box body, a temperature probe, and a pagoda joint. One side surface of one end of the lower box body is provided with three lower box body air inlets respectively connected with the upper box body air inlets, and the other side surface is provided with a heat dissipation cover connected with the lower box body air inlet. The other end of the lower box body is provided with a lower leaf chamber, and the lower leaf chamber is provided with a temperature probe, and the pagoda joint is connected with the lower leaf chamber. The lower box body is provided with a fourth air duct, a fifth air duct, and a sixth air duct respectively connecting the lower leaf chamber and the three lower box body air inlets; the upper leaf chamber of the upper box body and the lower leaf chamber of the lower box body are arranged in cooperation with each other, and the corresponding sides of the upper box body and the lower box body The surfaces are respectively provided with annular sealing rings that can be tightly sealed, and the three upper box body air inlets are provided with annular sealing rings that cooperate with the three lower box body air inlets; the handle assembly is arranged on one side of the upper blade chamber assembly and the lower blade chamber assembly, and the handle assembly is provided with a handle fixing seat fixed with the lower box body of the lower blade chamber assembly, and the handle assembly is provided with a pressing handle, and the pressing handle is hinged to one end of the handle fixing seat, and a reset device is provided in the middle, and the other end of the pressing handle is hinged to the upper box body of the upper blade chamber assembly; the top of the upper cavity assembly is connected to the heat dissipation cover of the lower box body, and the upper cavity assembly includes an upper cavity, and a fan, a fan motor, a reflective copper sheet, and a temperature and humidity sensor are arranged in the upper cavity. The left and right sides are respectively provided with heat sinks, cooling fins and heat dissipation fans; the front side of the upper cavity is a trapezoidal dome, and the inner sides of the trapezoidal dome are respectively provided with reflective copper sheets; the upper cavity is provided with a sample chamber and a reference chamber which are arranged in cooperation with the reflective copper sheets, and the sample chamber is connected with the upper leaf chamber; an air valve assembly is provided at the bottom of the upper cavity assembly, and the air valve assembly is respectively connected with the lower leaf chamber pagoda joint, the upper cavity sample chamber and the upper cavity reference chamber, and the air valve assembly is also connected with an external air source; the rear side of the upper cavity assembly is connected with the optical assembly, and the optical assembly is provided with two groups of light sources and two groups of detectors, and the light beams generated by the light sources respectively enter the sample chamber and the reference chamber of the upper cavity assembly and are reflected back to the detectors.

[0008] As a preferred solution of the utility model, the upper chamber assembly includes a chamber clamp, a chamber clamp air duct, an upper cover, a heat sink, a cooling fan, a connector, an illumination sensor, a quartz glass, a light source, a temperature sensor, a sealing ring, a foam sponge, and a PCB control board. In this solution, the chamber clamp is connected to the chamber clamp air duct by screws, the heat sink is connected to the chamber clamp by screws, the cooling fan is connected to the heat sink by screws, the quartz glass is glued to the inside of the chamber clamp by glue, the light source and the illumination sensor are stuck in the corresponding slots of the chamber clamp, the foam sponge is covered with 3M glue on one side and is glued to the corresponding positions of the chamber clamp air duct and the chamber clamp, the upper cover is connected to the chamber clamp air duct by screws, the connector is connected to the upper cover by screws, the PCB control board is fixed to the chamber clamp air duct by screws, the sealing ring is embedded in the groove of the chamber clamp, and a temperature sensor is installed inside the heat sink. After the temperature sensor reaches a preset temperature, the cooling fan starts to dissipate heat.

[0009] As a preferred embodiment of the utility model, the lower leaf chamber assembly includes a leaf chamber clamp, a leaf chamber clamp cover, a temperature probe cover, a foam sponge, a temperature probe, a spring, a temperature probe seat, a sealing pad, a sealing ring, a pagoda joint, a heat dissipation cover, and heat dissipation cover accessories. In this embodiment, the leaf chamber clamp is connected to the heat dissipation cover by screws, the leaf chamber clamp cover is connected to the leaf chamber clamp by screws, the temperature probe cover, the temperature probe seat and the leaf chamber clamp cover are connected by screws, a temperature probe and a spring are embedded inside, the heat dissipation cover accessories are connected to the heat dissipation cover by screws, the foam sponge is coated with 3M glue on one side and is glued to the corresponding position of the leaf chamber clamp, the pagoda joint is connected to the leaf chamber clamp cover by threads, and the sealing ring is embedded in the groove of the leaf chamber clamp.

[0010] As a preferred embodiment of the utility model, the upper cavity assembly includes an upper cavity, a heat dissipation fan, a heat sink, a cooling sheet, a reflective copper sheet, a sealing gasket, a fan, a motor, an insulating gasket, a decorative cover, a motor end cover, a sealing ring, and a temperature and humidity sensor. In this embodiment, the upper cavity is connected to the reflective copper block by screws, and a sealing gasket is arranged in the middle to maintain the sealing performance. The motor is connected to the upper cavity by screws, and the fan is glued to the motor shaft. The temperature and humidity sensor is connected to the upper cavity by screws, and a sealing ring is installed inside. The heat sink is connected to the upper cavity by screws, and a cooling sheet and a temperature sensor are arranged in the middle. The fan is connected to the heat sink by screws. After the temperature sensor reaches the preset temperature, the heat dissipation fan starts to dissipate heat.

[0011] As a preferred embodiment of the present invention, the handle assembly includes a shaft, a handle fixing seat, a reset wire, a spring sheet, a pressing handle, a handle silicone, a plug screw, a first pressing connector, a second pressing connector, a third pressing connector, a handle pressing connector, a pressing handle silicone, and a spring. In this embodiment, the pressing handle is connected to the handle fixing seat by screws, the handle pressing connector is connected to the handle by plug screws, the pressing connector 1 is connected to the handle by screws, the spring sheet is fixed to the first pressing connector by screws, the second pressing connector is connected to the handle pressing connector by screws, the third pressing connector is connected to the second pressing connector by pins, and the spring is embedded in the groove corresponding to the handle pressing connector.

[0012] As a preferred solution of the utility model, a return torsion spring is provided on the upper box body of the upper blade chamber assembly and the lower box body of the lower blade chamber assembly on the side close to the handle assembly.

[0013] As a preferred embodiment of the utility model, the optical assembly includes an upper shell, a lower shell, a light source, a copper column, a desiccant bottle, a plane mirror, a convex lens, a sealing ring, an encoder assembly, a motor, a PCB control board, an aviation plug, a circuit board decorative cover, and a desiccant end cap. In this embodiment, the plane mirror and the convex lens are embedded in the corresponding holes of the upper shell through an O-ring, the convex lens is at the bottom, and the plane mirror is at the top, the encoder assembly is connected to the upper shell by screws, the light source is connected to the upper shell by screws, the PCB control board is fixed to the light source seat by a copper column, the lower shell is connected to the upper shell by screws, the circuit board decorative cover is connected to the upper shell and the lower shell by screws, and the PCB control board is fixed to the circuit board decorative cover by screws.

[0014] As a preferred solution of the utility model, the air valve assembly includes a decorative cover, an air pipe, a solenoid valve, a solenoid valve fixing seat, a valve body lower pad, a sealing ring, a pagoda joint, and a three-way air pipe joint. In this solution, the decorative cover is connected to the valve body lower pad by screws, the solenoid valve fixing seat fixes the solenoid valve to the valve body lower pad by screws, the pagoda joint is screwed into the valve body lower pad by threads, and the sealing ring is embedded in the corresponding groove of the valve body lower pad.

[0015] The working principle of this scheme is to put plant leaves into the leaf chamber, and photosynthesis will consume CO2. By measuring the CO2 concentration difference between the inlet and outlet of the leaf chamber under light conditions, the net photosynthetic rate (Pn, Pn = △CO2 / ST) and transpiration rate (Tr) and other photosynthetic parameters can be calculated according to the leaf area; therefore, during the photosynthesis process, the concentration of CO2 and H2O molecules will change; in general, CO2 and H2O gases have the strongest absorption of infrared light, and the amount of infrared light energy absorbed is related to the absorption coefficient (K) of the gas, the gas concentration (C) and the thickness of the gas layer (L), and obeys the Lambert-Beer law. The net photosynthetic rate calculation formula is as follows:

[0016] A=F[Cr-Cs(1000-Wr / 1000-Ws)] / 100s

[0017] A=F×△CO2 water vapor correction / S

[0018] A: Net photosynthetic rate (μmol / m2 / s)

[0019] F: Flow rate (mol / s)

[0020] Cr: CO2 concentration in reference chamber (μmol / mol)

[0021] Cs: CO2 concentration in the sample chamber (μmol / mol)

[0022] Wr: H2O concentration in reference chamber (μmol / mol)

[0023] Ws: H2O concentration in the sample chamber (μmol / mol)

[0024] S: leaf area (m2).

[0025] The optical path principle of this scheme is based on the biconvex lens principle. The biconvex lens is a biconvex lens sheet, which includes an incident surface and an exit surface, and is characterized in that the focal length of the middle part of the lens surface is longer, and the focal length of the ends of each lens surface is shorter. The biconvex lens is mainly used to converge light from a point light source. The biconvex lens material is calcium fluoride (CaF2), D = 12.70mm, F = 20.00mm, the design wavelength is 587.6nm, and the working wavelength is 200nm-8μm. Calcium fluoride has a very high transmittance in the ultraviolet and infrared spectral ranges and has an extremely high damage threshold; the optical absorption equation describes the absorption process of light by a substance, which can be used to calculate the intensity or absorption coefficient of light absorbed by a substance. The optical absorption equation can be expressed as:

[0026] I = I0*e^(-α*d);

[0027] Among them, I is the intensity of light after passing through the material, I0 is the intensity of the incident light, α is the absorption coefficient, and d is the thickness of the material through which the light passes. This equation is based on the assumption that the intensity of light is exponentially related to the absorption coefficient of the material. The absorption coefficient α is usually related to the properties of the material, such as the concentration of the material, the wavelength of the light, etc. By measuring the intensity of the incident light and the transmitted light, the absorption coefficient α can be calculated.

[0028] This solution uses non-destructive or non-invasive methods to measure. The measurement process is simple and quick. You only need to gently clamp the leaf in the middle of the leaf chamber to complete the measurement. It uses advanced optical technology, has high measurement precision and accuracy, and reduces measurement time, and obtains experimental data more efficiently in real time. It has built-in multiple light sources and sensors, so that users can measure directly on site without measuring in outdoor lighting environments, and is not affected by environmental factors. At the same time, it can accurately control the parameters required for photosynthetic rate, such as light, temperature, etc., to ensure the stability and consistency of the measurement process to achieve precise control of environmental conditions such as light, temperature, humidity, CO2 concentration, etc.

[0029] Compared with the prior art, the utility model has the following beneficial effects: easy use, reliable measurement results, no need for sunlight, and dual-channel measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the closed state structure of the utility model.

[0031] Figure 2 This is a schematic diagram of the structure of the utility model in an open state.

[0032] Figure 3 It is a vertical sectional structural schematic diagram of the utility model.

[0033] Figure 4 It is a schematic diagram of a transverse sectional structure of the utility model.

[0034] Figure 5 It is a structural schematic diagram of the upper blade chamber component of the utility model.

[0035] Figure 6 The utility model is a schematic cross-sectional structure diagram of the upper blade chamber component.

[0036] Figure 7 It is a structural schematic diagram of the lower blade chamber component of the utility model.

[0037] Figure 8 The utility model is a schematic cross-sectional structure diagram of the lower blade chamber component.

[0038] Fig. 9 The utility model is a structural schematic diagram of a handle assembly.

[0039] Fig.10 The utility model is a schematic cross-sectional structure diagram of the handle assembly.

[0040] Fig.11 It is a structural schematic diagram of the upper cavity assembly of the utility model.

[0041] Fig.12It is a schematic cross-sectional structure diagram of the upper cavity assembly of the utility model.

[0042] Fig.13 The utility model is a cross-sectional structural schematic diagram of the gas valve assembly.

[0043] Fig.14 The utility model is a structural schematic diagram of an optical component.

[0044] Fig.15 The utility model is a schematic diagram of a cross-sectional structure of an optical component.

[0045] Fig.16 It is a schematic diagram of the gas circuit structure of the utility model.

[0046] Fig.17 It is a schematic diagram of the optical path structure of the utility model.

[0047] Fig.18 This is a schematic diagram of the optical path structure of the sample chamber of the utility model.

[0048] Fig.19 It is a schematic diagram of the optical path structure of the reference chamber of the utility model.

[0049] In the figure: 1. Upper blade chamber assembly 2. Lower blade chamber assembly 3. Air valve assembly

[0050] 4. Handle assembly 5. Optical assembly 6. Upper cavity assembly

[0051] 7. Reset torsion spring 101, upper blade chamber clamp 102, blade chamber clamp airway

[0052] 103, upper cover plate 104, heat sink 105, first cooling fan

[0053] 106. Connector 107. Illuminance sensor 108. Quartz glass

[0054] 109, first light source 111, upper leaf chamber sealing ring 112, upper foam sponge

[0055] 113, first PCB control board 201, lower blade chamber clamp

[0056] 202, leaf chamber clamp cover 203, temperature probe cover 204, lower foam sponge 205, temperature probe 206, spring 207, temperature probe seat

[0057] 208, first sealing pad 209, lower blade chamber sealing ring 210, pagoda joint

[0058] 211, heat dissipation cover 212, heat dissipation cover accessories 213, lower blade chamber air duct

[0059] 301, decorative cover 302, air pipe 303, solenoid valve 304, solenoid valve fixing seat 305, valve body bottom plate 306, air valve sealing ring 307, air valve pagoda joint

[0060] 308, three-way air pipe joint 309, air inlet pipe 310, air pipe fixing clamp 401, shaft 402, handle fixing seat 403, reset wire 404, spring sheet 405, pressing handle 406, handle silicone 407, plug screw 408, first pressing connector

[0061] 409, second pressing connector 410, third pressing connector 411, handle pressing member 412, handle pressing silicone 413, handle spring 414, first locking connector 415, second locking connector 501, upper shell 502, lower shell

[0062] 503, second light source 504, copper column 505, desiccant bottle 506, plane mirror 507, convex lens 508, light source sealing ring 509, encoder assembly 510, motor 511, second PCB control board 512, aviation plug 513, circuit board decorative cover 514, desiccant end cover 516, detector 601, upper cavity

[0063] 602, second cooling fan 603, heat sink 604, cooling sheet

[0064] 605, reflective copper sheet 606, second sealing gasket 607, fan 608, fan motor 609, insulating gasket 610, decorative cover 611, motor end cover

[0065] 612, upper cavity sealing ring 613, temperature and humidity sensor 614, sample chamber

[0066] 615. Reference room. DETAILED DESCRIPTION

[0067] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings, and several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0068] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this article includes any and all combinations of one or more related listed items.

[0070] See also Figure 1-Figure 19 , the utility model provides a technical solution:

[0071] A portable handheld analysis device for measuring plant photosynthesis comprises an upper leaf chamber assembly 1, a lower leaf chamber assembly 2, an air valve assembly 3, a handle assembly 4, an optical assembly 5, and an upper cavity assembly 6. The upper leaf chamber assembly 1 and the lower leaf chamber assembly 2 can be opened and closed and connected; the upper leaf chamber assembly 1 comprises an upper box body, a heat dissipation fan, and a connecting piece. The heat dissipation fan and the connecting piece are arranged on one side of the upper box body, and an upper leaf chamber recessed upwardly toward the box body is arranged on the other side of the upper box body. The heat dissipation fan and the upper leaf chamber are located at one end of the upper box body, and three upper box body air inlets are arranged at the other end of the upper box body. The upper box body is provided with a first air duct, a second air duct, and a third air duct, which are respectively connected to the upper leaf chamber and the three upper box body air inlets. A PCB control board is also provided in the upper box body, and a light source and an illumination sensor are provided in the upper leaf chamber; the lower leaf chamber assembly 2 includes a lower box body, a temperature probe, and a pagoda joint. Three lower box body air inlets that are respectively connected to the upper box body air inlets are provided on one side of one end of the lower box body, and a heat dissipation cover that is connected to the lower box body air inlet is provided on the other side. A lower leaf chamber is provided at the other end of the lower box body, and a temperature probe is provided in the lower leaf chamber. The pagoda joint is connected to the lower leaf chamber, and the fourth air duct, the fifth air duct, and the sixth air duct that are respectively connected to the lower leaf chamber and the three lower box body air inlets are provided in the lower box body; the upper leaf chamber of the upper box body and the lower leaf chamber of the lower box body are arranged in coordination with each other, and the upper box body and the lower box body correspond to each other. The sides are respectively provided with annular sealing rings that can be tightly sealed, and the three upper box air inlets are provided with annular sealing rings that match the three lower box air inlets; the handle assembly 4 is arranged on one side of the upper blade chamber assembly 1 and the lower blade chamber assembly 2, and the handle assembly 4 is provided with a handle fixing seat and fixed to the lower box body of the lower blade chamber assembly 2, and the handle assembly 4 is provided with a pressing handle, and the pressing handle is hinged to one end of the handle fixing seat, and a reset device is provided in the middle, and the other end of the pressing handle is hinged to the upper box body of the upper blade chamber assembly 1; the top of the upper cavity assembly 6 is connected to the heat dissipation cover of the lower box body, and the upper cavity assembly 6 includes an upper cavity, and a fan, a fan motor, a reflective copper sheet, and a temperature and humidity sensor are arranged in the upper cavity. Heat sinks, refrigeration fins and cooling fans are respectively provided on the left and right sides outside the body. The front side of the upper cavity is a trapezoidal arch, and reflective copper sheets are respectively provided on the inner sides of the trapezoidal arch. The upper cavity is provided with a sample chamber and a reference chamber which are arranged in conjunction with the reflective copper sheets, and the sample chamber is connected with the upper leaf chamber; an air valve assembly 3 is provided at the bottom of the upper cavity assembly 6, and the air valve assembly 3 is respectively connected with the lower leaf chamber pagoda joint, the upper cavity sample chamber, and the upper cavity reference chamber, and the air valve assembly 3 is also connected with an external air source; the rear side of the upper cavity assembly 6 is connected with the optical assembly 5, and two groups of light sources and two groups of detectors are arranged in the optical assembly 5. The light beams generated by the light sources respectively enter the sample chamber and the reference chamber of the upper cavity assembly and are reflected back to the detectors.

[0072] The upper blade chamber assembly 1 includes an upper blade chamber clamp 101, a blade chamber clamp air duct 102, an upper cover plate 103, a heat sink 104, a first cooling fan 105, a connector 106, an illumination sensor 107, a quartz glass 108, a first light source 109, an upper blade chamber sealing ring 111, an upper foam sponge 112, and a first PCB control board 113. The first cooling fan 105 is provided with a temperature sensor.

[0073] The lower chamber assembly 2 includes a lower chamber clamp 201, a chamber clamp cover 202, a temperature probe cover 203, a lower foam sponge 204, a temperature probe 205, a spring 206, a temperature probe seat 207, a first sealing gasket 208, a lower chamber sealing ring 209, a pagoda joint 210, a heat dissipation cover 211, a heat dissipation cover accessory 212, and a lower chamber air duct 213.

[0074] The upper cavity assembly 6 includes an upper cavity 601, a second cooling fan 602, a heat sink 603, a cooling sheet 604, a reflective copper sheet 605, a second sealing gasket 606, a fan 607, a fan motor 608, an insulating gasket 609, a decorative cover 610, a motor end cover 611, an upper cavity sealing ring 612, and a temperature and humidity sensor 613. The upper cavity 601 is provided with a sample chamber 614 and a reference chamber 615 which are arranged in conjunction with the reflective copper sheet.

[0075] The handle assembly 4 includes an axis 401, a handle fixing seat 402, a reset wire 403, a spring sheet 404, a pressing handle 405, a handle silicone 406, a plug screw 407, a first pressing connector 408, a second pressing connector 409, a third pressing connector 410, a handle pressing connector 411, a pressing handle silicone 412, a handle spring 413, a first locking connector 414, and a second locking connector 415.

[0076] A return torsion spring 7 is provided on one side of the upper box body of the upper leaf chamber assembly 1 and the lower box body of the lower leaf chamber assembly 2 close to the handle assembly 4 .

[0077] The optical component 5 includes an upper shell 501, a lower shell 502, a second light source 503, a copper column 504, a desiccant bottle 505, a plane mirror 506, a convex lens 507, a light source sealing ring 508, an encoder assembly 509, a motor 510, a second PCB control board 511, an aviation plug 512, a circuit board decorative cover 513, a desiccant end cover 514, and a detector 516.

[0078] The air valve assembly 7 includes a decorative cover 301, an air pipe 302, a solenoid valve 303, a solenoid valve fixing seat 304, a valve body bottom plate 305, an air valve sealing ring 306, an air valve pagoda connector 307, a three-way air pipe connector 308, an air inlet pipe 309, and an air pipe fixing clamp 310.

[0079] The working process of the utility model: The working principle of the scheme is to put plant leaves into the leaf chamber between the upper leaf chamber component 1 and the lower leaf chamber component 2. Photosynthesis will consume CO2. By measuring the CO2 concentration difference between the inlet and outlet of the leaf chamber under light conditions, the net photosynthetic rate (Pn, Pn = △CO2 / ST) and transpiration rate (Tr) and other photosynthetic parameters can be calculated according to the leaf area;

[0080] At the same time, two channels of light are provided to the sample chamber and the reference chamber through the optical component 5. After the light is refracted back, the intensity of the incident light and the transmitted light is measured by the detector 516, and the absorption coefficient can be calculated.

[0081] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A portable handheld analytical device for measuring plant photosynthesis, characterized in that: It includes an upper leaf chamber assembly, a lower leaf chamber assembly, an air valve assembly, a handle assembly, an optical assembly, and an upper cavity assembly, wherein the upper leaf chamber assembly and the lower leaf chamber assembly can be connected in an openable and closable manner; The upper blade chamber assembly comprises an upper box body, a cooling fan, and a connecting piece. The cooling fan and the connecting piece are arranged on one side of the upper box body. The other side of the upper box body is provided with an upper blade chamber recessed toward the upper box body. The cooling fan and the upper blade chamber are located at one end of the upper box body. The other end of the upper box body is provided with three upper box body air inlets. The upper box body is provided with a first air duct, a second air duct, and a third air duct respectively connecting the upper blade chamber and the three upper box body air inlets. The upper box body is also provided with a PCB control board. The upper blade chamber is provided with a light source and an illumination sensor. The lower leaf chamber assembly comprises a lower box body, a temperature probe, and a pagoda joint. Three lower box body air inlets respectively connected to the upper box body air inlets are provided on one side of one end of the lower box body, and a heat dissipation cover connected to the lower box body air inlets is provided on the other side. A lower leaf chamber is provided at the other end of the lower box body, a temperature probe is provided in the lower leaf chamber, the pagoda joint is connected to the lower leaf chamber, and a fourth air duct, a fifth air duct, and a sixth air duct respectively connected to the lower leaf chamber and the three lower box body air inlets are provided in the lower box body. The upper leaf chamber of the upper box body and the lower leaf chamber of the lower box body are arranged in cooperation with each other, and the corresponding sides of the upper box body and the lower box body are respectively provided with annular sealing rings that can be tightly sealed, and the three air inlets of the upper box body are provided with annular sealing rings that cooperate with the three air inlets of the lower box body; The handle assembly is arranged on one side of the upper blade chamber assembly and the lower blade chamber assembly. The handle assembly is provided with a handle fixing seat fixed to the lower box body of the lower blade chamber assembly. The handle assembly is provided with a pressing handle. The pressing handle is hinged to one end of the handle fixing seat and a reset device is provided in the middle. The other end of the pressing handle is hinged to the upper box body of the upper blade chamber assembly. The top of the upper cavity assembly is connected to the heat dissipation outer cover of the lower box body, and the upper cavity assembly includes an upper cavity, and a fan, a fan motor, a reflective copper sheet, and a temperature and humidity sensor are arranged in the upper cavity. The left and right sides of the upper cavity are respectively provided with a heat sink, a cooling sheet, and a heat dissipation fan. The front side of the upper cavity is a trapezoidal vault, and the inner sides of the trapezoidal vault are respectively provided with reflective copper sheets. The upper cavity is provided with a sample chamber and a reference chamber that are arranged in cooperation with the reflective copper sheets, and the sample chamber is connected to the upper leaf chamber; An air valve assembly is provided at the bottom of the upper cavity assembly, and the air valve assembly is respectively connected to the lower leaf chamber pagoda joint, the upper cavity sample chamber, and the upper cavity reference chamber, and the air valve assembly is also connected to an external air source; The rear side of the upper cavity assembly is connected to the optical assembly, and two groups of light sources and two groups of detectors are arranged in the optical assembly. The light sources generate light beams that enter the sample chamber and the reference chamber of the upper cavity assembly respectively and are reflected back to the detectors.

2. A portable handheld analysis device for measuring plant photosynthesis according to claim 1, characterized in that: The upper blade chamber assembly comprises a blade chamber clamp, a blade chamber clamp airway, an upper cover plate, a heat sink, a cooling fan, a connector, an illumination sensor, quartz glass, a light source, a temperature sensor, a sealing ring, a foam sponge, and a PCB control board.

3. A portable handheld analysis device for measuring plant photosynthesis according to claim 1, characterized in that: The lower blade chamber assembly comprises a blade chamber clamp, a blade chamber clamp cover, a temperature probe cover, a foam sponge, a temperature probe, a spring, a temperature probe seat, a sealing pad, a sealing ring, a pagoda joint, a heat dissipation cover, and heat dissipation cover accessories.

4. A portable handheld analysis device for measuring plant photosynthesis according to claim 1, characterized in that: The upper cavity assembly comprises an upper cavity, a cooling fan, a heat sink, a cooling sheet, a reflective copper sheet, a sealing gasket, a fan, a motor, an insulating gasket, a decorative cover, a motor end cover, a sealing ring, and a temperature and humidity sensor.

5. A portable handheld analysis device for measuring plant photosynthesis according to claim 1, characterized in that: The handle assembly includes a shaft, a handle fixing seat, a reset wire, a spring sheet, a handle, a handle silicone, a plug screw, a first pressing connector, a second pressing connector, a third pressing connector, a handle pressing connector, a handle pressing silicone, and a spring.

6. A portable handheld analysis device for measuring plant photosynthesis according to claim 1, characterized in that: A reset torsion spring is arranged on the upper box body of the upper blade chamber assembly and the lower box body of the lower blade chamber assembly on one side close to the handle assembly.

7. A portable handheld analysis device for measuring plant photosynthesis according to claim 1, characterized in that: The optical assembly comprises an upper shell, a lower shell, a light source, a copper column, a desiccant bottle, a plane mirror, a convex lens, a sealing ring, an encoder assembly, a motor, a PCB control board, an aviation plug, a circuit board decorative cover, and a desiccant end cap.

8. A portable handheld analysis device for measuring plant photosynthesis according to claim 1, characterized in that: The air valve assembly comprises a decorative cover, an air pipe, a solenoid valve, a solenoid valve fixing seat, a valve body lower pad, a sealing ring, a pagoda joint, and a three-way air pipe joint.

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