CN210198432U

CN210198432U - Leaf chamber for measuring photosynthesis of plant leaves and teaching aid based on leaf chamber

Info

Publication number: CN210198432U
Application number: CN201921116331.6U
Authority: CN
Inventors: Yu Bai; 白瑜; Xibing Sun; 孙希炳
Original assignee: Beijing Yaxin Science Instrument Technology Co Ltd
Current assignee: Beijing Yaxin Science Instrument Technology Co Ltd
Priority date: 2019-07-16
Filing date: 2019-07-16
Publication date: 2020-03-27
Anticipated expiration: 2029-07-16

Abstract

The utility model provides a leaf chamber for measuring photosynthesis of plant leaves and a teaching aid based on the leaf chamber, wherein the teaching aid comprises a shell, the leaf chamber, a control mainboard, a battery and a display device; the leaf chamber and the display device are arranged on the outer surface of the shell; the control mainboard and the battery are arranged inside the shell; the leaf chamber comprises a light source component, a closed air passage, a photosynthetic chamber and a measuring component; the photosynthetic room is formed by mutually independent concave space A and concave space B in a butt joint way; the light source component is arranged outside the concave space A; the closed air passage is arranged outside the photosynthetic chamber, and a uniform flow device and a measuring assembly are arranged in the closed air passage. The utility model has the advantages of being simple in structure and convenient in operation, can accomplish the photosynthetic rate measurement of plant leaf fast, accurately, be particularly suitable for using as the teaching aid in the teaching of botany classroom.

Description

Leaf chamber for measuring photosynthesis of plant leaves and teaching aid based on leaf chamber

Technical Field

The utility model relates to a teaching aid is used in biology classroom, concretely relates to teaching aid of measurable quantity plant leaf photosynthesis.

Background

Photosynthesis is generally the process by which green plants absorb light energy, synthesize energy-rich organic matter with carbon dioxide and water, and release oxygen. The photosynthetic capacity of plant leaves is usually measured in terms of photosynthetic rate, which is usually the amount of carbon dioxide absorbed per unit time of leaf volume, and can also be expressed in terms of the amount of accumulated dry matter per unit time of leaf volume.

Photosynthesis measuring equipment in the prior art is mostly suitable for being used in outdoor light environment, and measuring equipment all has the limitations that the structure is complicated, the operation and maintenance requirements are high, and the like, and are not beneficial to classroom teaching situation application. Therefore, the structure improvement of the measuring equipment is needed to be made based on the existing measuring principle, and a photosynthesis measuring teaching aid with simple and exquisite structure and low operation difficulty is researched and developed, so that the photosynthesis measuring teaching aid can be widely applied to basic teaching of biological classrooms.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the utility model provides a be used for plant leaf photosynthesis measuring teaching aid, can accomplish quick, simple and convenient plant leaf photosynthesis survey under classroom light environment. Compared with the existing photosynthesis apparatus, the photosynthesis apparatus has simpler structure, but can reach the measurement accuracy of the existing equipment.

The above object of the utility model is realized through following technical scheme:

firstly, a leaf chamber for measuring photosynthesis of plant leaves is provided, and comprises a light source component, a closed air passage, a photosynthesis chamber and a measurement component;

the photosynthetic chamber is an openable space formed by butting mutually independent concave spaces A and B and is used for providing conditions for photosynthesis on the front surface and the back surface of a plant leaf placed in the photosynthetic chamber; the side wall of the concave space A is at least provided with an air hole A1 and an air hole A2, and the side wall of the concave space B is at least provided with an air hole B1 and an air hole B2;

the light source component at least comprises a plurality of LED lamp beads and a light source circuit board; the light source assembly is arranged outside the recessed space A, and a high-light-transmission sealing piece is arranged between the recessed space A and the light source assembly, so that the recessed space A and the light source assembly are hermetically isolated, and meanwhile, light of the LED lamp beads can be emitted into the recessed space A;

the closed air passage is arranged outside the photosynthetic chamber and comprises an air passage I and an air passage II; the air hole A1 is communicated with the air hole B1 through an air passage I; the air hole A2 is communicated with the air hole B2 through an air passage II; a uniform flow device is arranged in the air passage II at a position far away from the air holes A2 and B2; the flow homogenizing device is used for uniformly mixing air flow and keeping circulation between the concave space A and the concave space B through the closed air passage;

the measuring component is arranged in the closed air channel and at least comprises a measuring circuit board and a sensor for measuring photosynthesis arranged on the measuring circuit board; the measuring circuit board is sealed at the tail end of the closed air passage and is provided with an external connection port; the measuring circuit board is electrically connected with the light source circuit board and the flow equalizing device respectively in the leaf chamber and is used for controlling the light source and the flow equalizing device to operate and supplying power to the light source and the flow equalizing device.

When the leaf room use, will photosynthetic room opens, places the plant leaf between sunken space A and the sunken space B, treat sunken space A and sunken space B to closing the back, form two parts photosynthetic space promptly in the blade both sides. When the light source subassembly started the back, light through high printing opacity sealing member jet into sunken space A, light and the air that exists in sunken space A, B form the photosynthesis environment of plant leaf jointly, the plant leaf can carry out photosynthesis. When the flow uniformizing device is started, the airflow in the closed air passage flows along a certain direction under the action of the flow uniformizing device, the airflow can circularly flow on two sides of the blade, and the measurement component can obtain the photosynthetic rate of the plant blade in the leaf chamber by measuring the airflow parameters in the closed air passage.

In the scheme of the utility model, the shapes and specifications of the concave space A and the concave space B are not particularly limited, but the sizes of the areas of the blades for photosynthesis in the two parts of spaces are required to be ensured to be equal; usually, the recess spaces a and B are both square grooves or circular recesses of the same size and shape. In order to facilitate the calculation of the leaf area where photosynthesis takes place, the utility model discloses preferred sunken space A and B are the circular sunken equal the same with size of specification.

The utility model discloses in the preferred scheme, the surface of sunken space A and sunken space B butt joint further set up the elasticity sealing washer for seal the photosynthetic space of blade both sides behind the placing blade.

In the preferred scheme of the utility model, the leaf chamber is formed by an upper block and a lower block which are pivoted through one end; the sunken space A and the light source assembly are arranged at the non-pivoting end of the upper block, and the sunken space B is arranged at the non-pivoting end of the lower block; the air passage is divided into two parts and arranged inside the upper block and the lower block to form an air passage A1C1 and an air passage B1C1, the two parts and the two parts of the air passage are arranged inside the upper block and the lower block to form an air passage A2C2 and an air passage B2C2, and the upper block and the lower block are provided with a pair of air holes C1 which are opposite positively and a pair of air holes C2 which are opposite positively at the positions close to the pivot joint; the flow uniformizing device and the measuring assembly are both arranged in the air passage in the lower block. During measurement, the flow equalizing device is started to enable the air flow to flow in a certain direction, and the air flow which is in reciprocating circulation between the concave space A and the concave space B is formed. For example, the air flow can enter the air passage A1C1 from the concave space A through the air hole A1 to reach the air hole C1 of the upper block, then enter the air passage B1C1 through the air hole C1 of the lower block, and enter the concave space B through the air hole B1; the air flow entering the concave space B is subjected to photosynthesis through the blades, then enters the air passage B2C2 from the air hole B2 to reach the air hole C2 of the lower block, then enters the air passage A2C2 through the air hole C2 of the upper block, and enters the other side of the blade in the concave space A through the air hole A2 to be subjected to photosynthesis, so that circulation is formed, but the circulating flow direction of the air flow is not particularly limited and mainly depends on the structure of the air passage and the pushing action of the uniform flow device.

The utility model discloses in further preferred scheme, last piece do not in its middle part the position of closed circuit air flue vertically is equipped with the calabash hole, lower piece do not in its middle part the position of closed circuit air flue vertically is equipped with the screw, the calabash hole with the screw forward relative photosynthetic room dockable formation regulation hole after closed, the regulation downthehole nylon screw that is equipped with, nylon screw head be located in the calabash is downthehole and root spiro union in the screw, the nylon screw be used for connecting upper and lower piece and be in through nylon screw upper portion the inseparable degree between upper and lower piece is adjusted to the small amplitude removal in the calabash hole, still is used for preventing the blade excessively to deepen the locellus simultaneously. When the head of the nylon screw is positioned in the gourd hole, the nylon screw has elasticity, so that the tightness between the upper block and the lower block can be reduced and the distance between the upper block and the lower block can be increased by pushing the head of the nylon screw into the wider part of the gourd hole along the horizontal direction, and the two parts of the photosynthetic chamber can be opened in a small range; when the head of the nylon screw is pushed into the narrow part from the wide part of the gourd hole, the tightness between the upper block and the lower block is increased, and the two parts of the photosynthetic chamber can be tightly locked.

The utility model discloses in the more preferred scheme, near regulation hole further set up the spring, be used for the nylon screw head is overcome when transferring to the open mode from the lock dead state the pulling force of nylon screw makes the two parts of photosynthetic room are opened as early as possible.

In a further preferable scheme of the utility model, the lower block is further internally provided with an air passage branch which is communicated with the air holes C1 and C2; the airway branch is independent of the airways B1C1 and B2C2, and the measuring assembly is arranged in the airway branch; the uniform flow device is arranged in the air passage branch and is positioned at the air hole C1 or the air hole C2; when the flow uniformizing device is arranged at the air hole C1, the air flow can enter the air passage branch from the air hole C1 under the action of the flow uniformizing device, and then enter the air passage two from the air hole C2, namely enter the air passage A2C2 and the air passage B2C2 respectively, and further enter the concave space a and the concave space B through the air hole A2 and the air hole B2 respectively, namely enter the two parts of the photosynthetic chamber, after participating in photosynthesis, the air flow reaches the air hole C1 from the air hole A1 and the air hole B1 along the air passage one (namely the air passage A1C1 and the air passage B1C1), namely, the air flow circulation is completed; the same applies when the uniform flow device is arranged at the air hole C2.

In a more preferred embodiment of the present invention, the uniform flow device is preferably a centrifugal fan for drawing the air flow into the air passage branch from the air hole C1 or C2.

In order to make the air flow and air pressure in the photosynthetic chamber uniform, in a further preferable scheme of the utility model, air holes are arranged at different positions of the photosynthetic chamber at intervals, and the side wall of the depressed space A is sequentially provided with 4 air holes at intervals, namely an air hole A11, an air hole A21, an air hole A22 and an air hole A12; 4 air holes, namely an air hole B11, an air hole B21, an air hole B22 and an air hole B12, are formed in the side wall of the sunken space B at intervals in sequence; the upper block and the lower block are sequentially provided with a pair of air holes C11, a pair of air holes C2 and a pair of air holes C12 which are opposite to each other and are close to the pivoting position; the air passage A1C1 in the upper block is further divided into an air passage A11C11 and an air passage A12C12 which are independent from each other and are respectively connected with an air hole A11 and an air hole C11, and an air hole A12 and an air hole C12, and the air passage B1C1 in the lower block is further divided into an air passage B11C11 and an air hole B12C12 which are independent from each other and are respectively connected with an air hole B11, an air hole C11, and an air hole B12 and an air hole C12; the air passage A2C2 in the upper block is further divided into an air passage A21C2 and an air passage A22C2, one end of each air passage is intersected with the air hole A21 and the air hole C2, and the air hole A22 and the air hole C2 respectively, the air passage B2C2 in the lower block is further divided into an air passage B21C2 and an air passage B22C2, one end of each air passage is intersected with the air hole B21 and the air hole C2, and the air hole B22 and the air hole C2 respectively; the lower block is further internally provided with an air passage branch which is communicated with the air hole C2 of the lower block and the air holes C11 and C12 of the lower block; the air passage branch is independent of the air passages B11C11, B12C12, B21C2 and B22C2, and the measuring assembly is arranged in the air passage branch; the uniform flow device is arranged in the air passage branch and is positioned at the air hole C2. In use, the uniform flow device draws air flow from air passages B21C2 and B22C2 into the air passage branch through the air holes C2, the air flow exits the air passage branch from the air holes C11 and C12 after passing through the air passage branch and enters the air passages a11C11, a12C12, B11C11 and B12C12 respectively, enters the depression space a through the air holes a11 and a12, and simultaneously enters the depression space B through the air holes B11 and B12, the air flow in the depression space a exits from the air holes a21 and a22 after participating in blade photosynthesis in the depression space a and the depression space B, the air flow along the air passages a21C2 and a22C2 reaches the air holes C2 of the upper block, and the air flow in the depression space B exits from the air holes B21 and B22, the air holes B21C2 and B22C2 are drawn into the air holes C2 again, thereby completing the uniform flow circulation.

In the scheme of the utility model, the sensor for measuring photosynthesis can be a plurality of sensors for measuring parameters related to leaf photosynthesis; at least comprises a carbon dioxide concentration sensor and a temperature sensor; and may also include any one or combination of more of a humidity sensor, an air pressure sensor, or an illumination sensor.

The utility model discloses in the preferred scheme, the measuring circuit board further set up the calculation module, embedded photosynthetic rate calculation procedure, photosynthesis measure with sensor survey parameter after transmit extremely calculation module, utilize calculation procedure can calculate the photosynthetic rate that obtains the blade.

Based on the leaf chamber, the utility model also provides a teaching aid for measuring photosynthesis of plant leaves, which consists of a shell, the leaf chamber, a control mainboard, a battery and a display device; the leaf chamber and the display device are arranged on the outer surface of the shell; the control mainboard and the battery are arranged inside the shell; the battery is electrically connected with the control mainboard through a power line and used for supplying power to the control mainboard; the control main board is electrically connected with the measuring circuit board of the leaf chamber and the display device through flat cables respectively and is used for supplying power to the measuring circuit board and the display device and realizing data interaction.

The utility model discloses in the preferred scheme, the preferred touch liquid crystal display of display device, the accessible touch liquid crystal display to control mainboard input parameter or instruction, by control mainboard control the indoor light source of leaf receive simultaneously and come from the calculation data of leaf room measuring circuit board.

A teaching aid for plant leaf photosynthesis is measured uses indoor usually. When the device is used, the plant leaves are placed in the position of the photosynthetic chamber and the photosynthetic chamber is locked according to a conventional method, so that a closed air flow channel is formed in the leaf chamber. Can predetermine according to the needs of simulation natural light or sunlight the working parameter of light source subassembly, the utility model discloses in the preferred scheme, the accessible touch liquid crystal display input to the control mainboard predetermine the parameter, the control mainboard receive through its control circuit way behind the predetermined parameter light source circuit board send control signal, with the illumination parameter control of LED lamp pearl predetermine the within range. After power is supplied, the LED and the uniform current device are started, a closed cycle of air flow is formed between the two parts of the photosynthetic chamber of the leaf chamber, the sensor on the measuring circuit board of the leaf chamber measures the parameters of the air flow passing through at different time points, data are transmitted to the control circuit board through the data line, then the photosynthetic rate result can be calculated, and then the data are further transmitted to the touch type liquid crystal display screen through the data line to be displayed. When the parameters of the incident light need to be changed for a new measurement experiment, new light source control parameters can be input into the control circuit board, and then the above process is repeated.

In the prior art, a measuring device for plant photosynthesis generally comprises two independent devices for collecting and measuring, for example, collecting airflow for collecting photosynthesis on the surface of a leaf by clamping the leaf surface with a clamping handle or a leaf chamber, and measuring is completed outside a collecting device by using a box-type device with a built-in sensor and a computing module, wherein the collected airflow is guided out of the collecting device through an air pipe and is conveyed into the box-type measuring device. Besides the disadvantages of complex structure and high maintenance requirement, the conventional photosynthesis measuring device has the problem that the measurement result is influenced by time delay due to the structure that air flow is conveyed between the two devices through a certain length of air pipe, and large errors exist. The utility model discloses all be applicable to photosynthesis survey's sensor and all integrate in the air flue of leaf room, leaf indoor self forms closed air flue and is used for measuring, need not external connection trachea again, has not only simplified the structure, has reduced the requirement of maintaining and operating, and more importantly leaf indoor accomplishes the measurement on the spot, has avoided the error that measuring time delay brought. In a word, the utility model has the advantages of being simple in structure and convenient in operation, can accomplish the photosynthetic rate measurement of plant leaf fast, accurately, be particularly suitable for using as the teaching aid in the botany classroom teaching.

Drawings

FIG. 1 is a schematic view showing the overall structure of a leaf chamber described in example 1.

FIG. 2 is an exploded view of the leaf chamber described in example 1.

Fig. 3 is a schematic view of the structure of the lower surface of the airway plate 120 of the upper block of the vane chamber in embodiment 1.

Fig. 4 is a cross-sectional view of the lower surface of the air passage component 2A of the lower block of the vane chamber in example 1.

Fig. 5 shows the structure of the inside of the branch measuring unit 2B of the lower vane cell block described in embodiment 1, i.e., the inside view is partially cut away from the measuring circuit board on the lower surface.

Fig. 6 is a cross-sectional view of the teaching aid of example 2.

Detailed Description

The technical solution of the present invention will be described in detail below by way of examples. However, the present invention is not limited to the following examples.

Example 1

A leaf chamber for determining photosynthesis of plant leaves comprises a light source assembly, a closed air passage, a photosynthesis chamber and a measurement assembly;

as shown in fig. 1, the vane chamber is integrally formed by an upper block 100 and a lower block 200 which are pivoted at one end; wherein the lower block 200 is further comprised of an air passage assembly 2A and a bypass measuring assembly 2B.

As shown in fig. 2 and 3, the upper block 100 is further composed of a top cover 110 and an air duct plate 120; the airway plate 120 is embedded under the top cover 110; a light source cabin 111 is arranged at the non-pivoting end inside the top cover 110, and a light source assembly consisting of a plurality of LED lamp beads 102 and a light source circuit board 103 is arranged in the light source cabin 111; a plurality of heat dissipation through holes 1111 are formed around the light source cabin 111; the LED lamp beads 102 are electrically connected with the light source circuit board 103 inside the light source cabin 111, and a wire groove 1112 LED out of the light source cabin 111 is further arranged in the top cover 110. A circular through hole 121 is formed in the airway plate 120 at the non-pivoting end, opposite to the light source cabin 111, and a high-light-transmittance organic glass (not shown) is arranged between the light source cabin 111 and the circular through hole 121 for hermetically isolating the light source cabin 111 from the circular through hole 121, so that a circular concave space a is formed at the non-pivoting end of the upper block 100, and the light of the LED lamp bead 102 can be emitted into the concave space a while the concave space a and the light source cabin 111 are hermetically isolated; the side wall of the sunken space A is provided with 4 air holes at intervals, namely an air hole A11, an air hole A21, an air hole A22 and an air hole A12; the air duct plate 120 is provided with an air hole C11, an air hole C2 and an air hole C12 which are opened downwards in sequence near the pivoting end; the surface of the air channel plate 120 facing the top cover 110 is further provided with a shallow groove connecting the recessed space a and the three air holes as an air channel, the shallow groove comprises an air channel a11C11 and an air channel a12C12 which are independent of each other, the air channel a11 and the air hole C11 are respectively connected, the air hole a12 and the air hole C12 are respectively connected, and the air channel a21C2 and the air channel a22C2 of which one ends are intersected respectively connect the air hole a21 and the air hole a22 and the air hole C2. There is no intersection between the wire grooves 1112 on the top cover 110 and the shallow grooves on the airway plate to achieve the closure of the airway.

As shown in fig. 2 and 4, the lower block 200 is further composed of an air passage module 2A and a branch measurement module 2B. The air passage component 2A is provided with a round recess 212 with a closed lower part at the non-pivoting end opposite to the round through hole 121 to serve as a recess space B, and the side wall of the recess space B is sequentially provided with 4 air holes at intervals, namely an air hole B11, an air hole B21, an air hole B22 and an air hole B12; the air duct assembly 2A is provided with a through hole C11, a through hole C2 and a through hole C12 in parallel in sequence near the pivoting end, which are respectively opposite to the air hole C11, the air hole C2 and the air hole C12 of the air duct plate 120. An air passage B11C11 and an air passage B12C12 which are mutually independent are arranged in the air passage component 2A and are respectively connected with an air hole B11 and an air hole C11, an air hole B12 and an air hole C12; an air passage B21C2 and an air passage B22C2 with one end meeting are further arranged in the air passage component 2A to connect the air hole B21 and the air hole B22 with the air hole C2. The lower surface of the air channel assembly 2A is closed, and the air channel assembly is communicated with the outside only at the through hole C11, the through hole C2 and the through hole C12.

As shown in fig. 5, the branch measurement module 2B is stacked below the air passage module 2A; the upper surface of the non-pivoting end of the branch measuring component 2B is also provided with an air hole C2, an air hole C11 and an air hole C12 in parallel in sequence, and the air holes are respectively opposite to a through hole C2, a through hole C11 and a through hole C12 on the air passage component 2A; the other ends of the air hole C2, the air hole C11 and the air hole C12 of the branch measurement module 2B are opened inside the branch measurement module 2B; the branch measurement module 2B is hollow, and a centrifugal fan 2B1 is provided at an air hole C2 thereof, and is used for drawing air from the air hole C2 into the branch measurement module 2B and discharging the air from the air hole C11 and the air hole C12 in two paths. The branch path measurement unit 2B is provided with a measurement circuit board 2B2, and the measurement circuit board 2B2 is provided with a plurality of sensors related to photosynthesis measurement, such as a temperature sensor and a carbon dioxide concentration sensor. The measuring circuit board 2B2 is closed at the tail end of the cavity of the branch determining component 2B, and an external interface 2B21 is arranged on the back surface of the measuring circuit board; the measurement circuit board 2B2 is electrically connected with the light source circuit board 103 through an airtight joint and an electric wire up to the upper block 100 via the wire groove 1112, and the measurement circuit board 2B2 and the centrifugal fan 2B1 are electrically connected inside the branch determination module 2B to control and supply power to the LED lamp and the fan. The measurement circuit board 2B2 is further provided with a calculation module, a photosynthetic rate calculation program is embedded, the sensor related to photosynthesis measurement measures parameters and transmits the parameters to the calculation module, and the photosynthetic rate of the leaves can be calculated by using the calculation program.

The photosynthetic chamber is an openable and closable space formed by butting mutually independent concave spaces A and B and is used for providing photosynthesis conditions for plant leaves placed in the photosynthetic chamber; the surface of the concave space A and the concave space B which are butted is further provided with an elastic sealing ring 0 for placing the photosynthetic space at the two sides of the closed blade. Meanwhile, sealing rings are arranged on the lower surface of the air flue plate 120, the upper surface and the lower surface of the air flue assembly 2A and the upper surface of the branch measuring assembly 2B and around all the air holes C11, C12 and C2 so as to enhance the tightness of the whole air flue.

As shown in fig. 1-4, the upper block 100 is longitudinally provided with a gourd hole 105 at a position without an air passage in the middle thereof, the lower block 200 is longitudinally provided with a screw hole 205 with equal diameter at a position without an air passage in the middle thereof, the gourd hole 105 and the screw hole 205 are opposite in the positive direction, an adjusting hole can be formed by butt joint after the photosynthetic chamber is closed, a nylon screw 106 is arranged in the adjusting hole, the head of the nylon screw 106 is positioned in the gourd hole 105, the root of the nylon screw is screwed in the screw hole 205, the nylon screw 106 is used for connecting the upper block and the lower block, adjusting the tightness between the upper block and the lower block by small-amplitude movement of the upper part of the nylon screw in the gourd hole 105. When the head of the nylon screw 106 is positioned at the variable-diameter part of the gourd hole 105, the nylon screw has elasticity, so that the tightness between the upper block and the lower block can be reduced and the distance between the upper block and the lower block can be increased when the head of the nylon screw is pushed into the depth of the adjusting hole along the horizontal direction, and the two parts of the photosynthetic chamber can be opened slightly; when the head of the nylon screw is pushed into the equal-diameter part by the diameter-variable part, the tightness between the upper block and the lower block is increased, and the two parts of the photosynthetic chamber can be tightly locked. A spring 107 is further arranged near the adjusting hole and is used for overcoming the pulling force of the nylon screw when the head of the nylon screw 106 is adjusted from the locking state to the opening state, so that the two parts of the photosynthetic chamber are opened as soon as possible.

When the photosynthetic device is used, the photosynthetic chamber is opened firstly, the plant leaves are placed between the concave space A and the concave space B, and after the concave space A and the concave space B are closed, two parts of photosynthetic spaces are formed on two sides of the leaves. When the light source subassembly starts the back, light pass through high printing opacity organic glass inject into sunken space A, light and the air (mainly being carbon dioxide) that exists in sunken space A, B form the photosynthetic environment of plant leaf jointly, and the plant leaf can carry out photosynthesis. The centrifugal fan 2B1 in the bypass measurement module 2B is started, the air flow is drawn into the cavity of the bypass measurement module 2B from the air passages B21C2 and B22C2 through the air hole C2, the air flow exits the bypass measurement module 2B from the air holes C11 and C12 after passing through the bypass measurement module 2B and enters the air passage a11C11, the air passage a12C12 and the air passage B11C11 and the air passage B12C12 of the air passage module 2A, enters the concave space a from the air hole a11 and the air hole a12 and enters the concave space B from the air hole B11 and the air hole B12 respectively, after the air flow participates in the photosynthetic vane in the concave space a and the concave space B, the air flow in the concave space a exits from the air hole a21 and the air hole a22 and reaches the air hole C2 of the upper block 100 along with the air flow of the air hole B21C2 and the air hole B22C2 of the upper block 100 and simultaneously exits the air hole B21 and the air passage B82862C 862C 8653 and the air passage B82 2, again drawn into the branch circuit measuring assembly 2B by the centrifugal fan 2B1, thereby completing a closed cycle of airflow which can be cycled back and forth across the blades. Meanwhile, the measurement circuit board 2B2 installed inside the bypass measurement module 2B measures parameters of the closed-cycle airflow using a sensor, and calculates the photosynthetic rate of the plant leaves inside the leaf chamber.

Example 2

A teaching aid for measuring photosynthesis of plant leaves is shown in FIG. 6 and comprises a housing 300, a leaf chamber 400 of embodiment 1, a control main board 500, a battery 600 and a touch liquid crystal display screen 700; the leaf chamber 400 is arranged on the top of the shell 300 through a leaf chamber mounting seat 401, and the touch type liquid crystal display screen 700 is arranged on the outer surface of the shell 300; the control mainboard 500 and the battery 600 are arranged inside the shell 300; the battery 600 is electrically connected with the control mainboard 500 through a power line 3 and is used for supplying power to the control mainboard 500; the control main board 500 is electrically connected with the external interface 2B21 of the measurement circuit board of the leaf chamber 400 and the touch type liquid crystal display screen 700 through the flat cable 4, and is used for supplying power to the measurement circuit board 2B21 and the touch type liquid crystal display screen 700 and realizing data interaction.

Parameters or instructions can be input into the control main board 500 through the touch liquid crystal display screen 700, the control main board 500 controls the illumination parameters of the LEDs in the leaf chamber 300, and meanwhile, the calculation data from the leaf chamber measurement circuit board 2B2 is received.

A teaching aid for plant leaf photosynthesis is measured uses indoor usually. When the device is used, the plant leaves are placed in the position of the photosynthetic chamber and the photosynthetic chamber is locked according to a conventional method, so that a closed air flow channel is formed in the leaf chamber. The working parameters of the light source component can be preset according to the requirements of simulating natural light or sunlight, the preset parameters can be input into the control mainboard through the touch liquid crystal display screen, the control mainboard receives the preset parameters and then sends control signals to the light source circuit board through the control circuit of the control mainboard, and the illumination parameters of the LED lamp beads are controlled within a preset range. After power is supplied, the LED and the uniform current device are started, a closed cycle of air flow is formed between the two parts of the photosynthetic chamber of the leaf chamber, the sensor on the measuring circuit board of the leaf chamber measures the parameters of the air flow passing through at different time points, data are transmitted to the control circuit board through the data line, then the photosynthetic rate result can be calculated, and then the data are further transmitted to the touch type liquid crystal display screen through the data line to be displayed. When the parameters of the incident light need to be changed for a new measurement experiment, new light source control parameters can be input into the control circuit board, and then the above process is repeated.

Claims

1. A leaf chamber for measuring photosynthesis in plant leaves, comprising: the device comprises a light source component, a closed air passage, a photosynthetic chamber and a measuring component;

the photosynthetic chamber is an openable space formed by butting mutually independent concave spaces A and B and is used for providing conditions for photosynthesis on the front surface and the back surface of a plant leaf placed in the photosynthetic chamber; the side wall of the sunken space A is at least provided with an air hole A1 and an air hole A2, and the side wall of the sunken space B is at least provided with an air hole B1 and an air hole B2;

2. Leaf chamber according to claim 1, characterized in that: the leaf chamber is formed by an upper block and a lower block which are pivoted through one end; the sunken space A and the light source assembly are arranged at the non-pivoting end of the upper block, and the sunken space B is arranged at the non-pivoting end of the lower block; the air passage is divided into two parts and arranged inside the upper block and the lower block to form an air passage A1C1 and an air passage B1C1, the two parts and the two parts of the air passage are arranged inside the upper block and the lower block to form an air passage A2C2 and an air passage B2C2, and the upper block and the lower block are provided with a pair of air holes C1 which are opposite positively and a pair of air holes C2 which are opposite positively at the positions close to the pivot joint; the flow uniformizing device and the measuring assembly are both arranged in the air passage of the lower block.

3. Leaf chamber according to claim 2, characterized in that: the closed air passage is arranged in the middle of the upper block, a gourd hole is longitudinally formed in the position, without the closed air passage, of the middle of the lower block, a screw hole is longitudinally formed in the position, without the closed air passage, of the lower block, the gourd hole is opposite to the screw hole in the forward direction, an adjusting hole is formed after the photosynthetic chamber is closed in a butt joint mode, a nylon screw is arranged in the adjusting hole, the head portion of the nylon screw is located in the gourd hole, the root portion of the nylon screw is in threaded connection with the screw hole, the nylon screw is used for connecting the upper block and the lower block, the tightness between the upper block and the lower block is adjusted through small-amplitude movement of the upper portion of the nylon screw in the gourd hole.

4. Leaf chamber according to claim 3, characterized in that: and springs are further arranged near the adjusting holes on the opposite surfaces of the upper block and the lower block and used for overcoming the pulling force of the nylon screws when the heads of the nylon screws are adjusted from a locking state to an opening state, so that the two parts of the photosynthetic chamber are opened as soon as possible.

5. Leaf chamber according to claim 2, characterized in that: the lower block is further internally provided with an air passage branch which is communicated with the air holes C1 and C2; the airway branch is independent of the airways B1C1 and B2C2, and the measuring assembly is arranged in the airway branch; the uniform flow device is arranged in the air passage branch and is positioned at the air hole C1 or the air hole C2.

6. Leaf chamber according to claim 5, characterized in that: the uniform flow device is a centrifugal fan and is used for drawing airflow into the air channel branch from the air holes C1 or C2.

7. Leaf chamber according to claim 2, characterized in that: 4 air holes, namely an air hole A11, an air hole A21, an air hole A22 and an air hole A12, are formed in the side wall of the recessed space A at intervals in sequence; 4 air holes, namely an air hole B11, an air hole B21, an air hole B22 and an air hole B12, are formed in the side wall of the sunken space B at intervals in sequence; the upper block and the lower block are sequentially provided with a pair of air holes C11, a pair of air holes C2 and a pair of air holes C12 which are opposite to each other and are close to the pivoting position; the air passage A1C1 in the upper block is further divided into an air passage A11C11 and an air passage A12C12 which are independent from each other and are respectively connected with an air hole A11 and an air hole C11, and an air hole A12 and an air hole C12, and the air passage B1C1 in the lower block is further divided into an air passage B11C11 and an air hole B12C12 which are independent from each other and are respectively connected with an air hole B11, an air hole C11, and an air hole B12 and an air hole C12; the air passage A2C2 in the upper block is further divided into an air passage A21C2 and an air passage A22C2, one end of each air passage is intersected with the air hole A21 and the air hole C2, and the air hole A22 and the air hole C2 respectively, the air passage B2C2 in the lower block is further divided into an air passage B21C2 and an air passage B22C2, one end of each air passage is intersected with the air hole B21 and the air hole C2, and the air hole B22 and the air hole C2 respectively; the lower block is further internally provided with an air passage branch which is communicated with the air hole C2 of the lower block and the air holes C11 and C12 of the lower block; the air passage branch is independent of the air passages B11C11, B12C12, B21C2 and B22C2, and the measuring assembly is arranged in the air passage branch; the uniform flow device is arranged in the air passage branch and is positioned at the air hole C2.

8. Leaf chamber according to claim 1, characterized in that: the measuring circuit board is further provided with a calculating module, a photosynthetic rate calculating program is embedded in the calculating module, the sensor for measuring photosynthesis measures parameters and then transmits the parameters to the calculating module, and the photosynthetic rate of the leaves can be calculated by using the calculating program.

9. A teaching aid for plant leaf photosynthesis is measured which characterized in that: it is composed of a housing, a leaf chamber according to claim 1, a control mainboard, a battery and a display device; the leaf chamber and the display device are arranged on the outer surface of the shell; the control mainboard and the battery are arranged inside the shell; the battery is electrically connected with the control mainboard through a power line and used for supplying power to the control mainboard; the control main board is electrically connected with the measuring circuit board of the leaf chamber and the display device through flat cables respectively and is used for supplying power to the measuring circuit board and the display device and realizing data interaction.

10. A teaching aid as claimed in claim 9, wherein: the display device is a touch liquid crystal display screen.