CN115684504A - Miniature stem flow sensor for plant fine stems - Google Patents
Miniature stem flow sensor for plant fine stems Download PDFInfo
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- CN115684504A CN115684504A CN202211704985.7A CN202211704985A CN115684504A CN 115684504 A CN115684504 A CN 115684504A CN 202211704985 A CN202211704985 A CN 202211704985A CN 115684504 A CN115684504 A CN 115684504A
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Abstract
The invention discloses a miniature stem flow sensor for plant fine stems, which comprises a flexible measuring part and a control part, wherein the flexible measuring part is connected with the control part; the flexible measuring part comprises a flexible base material, and a heating module and a temperature measuring module which are arranged on the flexible base material, wherein the flexible base material is used for attaching the heating module and the temperature measuring module to the surface of the stem to be measured; the control part comprises a control communication module and a plurality of leads, and the control communication module is connected with the heating module and the temperature measuring module through the leads; according to the miniature stem flow sensor for the small plant stems, the flexible material can be attached to the surfaces of the plant stems in a self-adaptive manner, the miniature temperature measuring module and the heating module are arranged on two sides of the plant stems (in a nonlinear arrangement), so that the direct interference of the heating module on the temperature measuring module is avoided, the overall size of the sensor is reduced while the measurement accuracy is improved, and the nondestructive measurement of the stem flow rate of the plant with the fine plant stems and extremely short internodes can be realized.
Description
Technical Field
The invention relates to the field of sensors, in particular to a miniature stem flow sensor for small plant stems.
Background
Water is a core element of plant life activities, and after entering a plant root system from soil, the water reaches leaves, flowers, fruits and other organs through a xylem conduit of a plant stem and finally diffuses into the atmosphere through a leaf pore to form a physically uniform soil-plant-atmosphere continuum, wherein the plant stem flow is an important part of water transportation in a plant body, the plant stem flow is an ascending liquid flow generated by the plant in the stem under the action forces of transpiration, osmotic potential and the like, is a carrier of plant water, nutrients and signal molecules, probes the motion state and the time-space law of the plant, can better clarify the physiological information of the plant water, and has great significance for scientific research and guidance of agricultural production.
At present, there are many methods for detecting plant stem flow, and the detection methods are mainly divided into two categories: isotope labeling methods and in vivo imaging methods. The isotope tracing method is to add H and O isotopes as tracing agents to the stem flow in the stems, and reflect the stem flow rate through the displacement of the tracing agents. In-vivo imaging methods generally use medical imaging techniques, such as nuclear magnetic resonance, X-ray imaging, etc., to detect the moisture transport inside the plant in vivo. The method is not suitable for outdoor use in fields and is only limited to be carried out in laboratories.
The stem flow sensor is the most commonly used instrument for measuring plant stem flow at present, and the measurement of the stem flow is generally realized by a heat tracing method, and the detection methods of the heat tracing method are mainly divided into three types: thermal pulse methods, thermal diffusion methods, and thermal equilibrium methods. The basic principle is as follows: a heat source probe is arranged in the stalk and is used for heating the stalk. According to the principle of heat conduction, heat generated by heating is preferentially carried by the stem flow to be transmitted downstream. Thus, the stem flow velocity is calculated by measuring the upstream and downstream temperature differences due to stem flow with a stem temperature probe installed in the stem.
However, current stem flow sensors are unable to measure the stem flow rate of plants with fine stalks and short internodes. First, the heat pulse method and the heat diffusion method are invasive methods, and require inserting a probe into the plant stem, which easily damages the plant, especially for the plant with slender stem, the invasive method can cause the plant to die. Secondly, the conventional non-invasive or wrapped stem flow sensor has large physical sizes of a temperature sensor and a heater, and is generally arranged in a linear manner, so that the sensor is too large in overall size and cannot be installed on small plant stems with short internodes. Although the overall size of the sensor can be reduced by reducing the distance between the temperature sensor and the heater, the temperature sensor and the heater are too close to each other and are prone to interference.
Disclosure of Invention
In order to overcome the defects of the technology, the invention provides the miniature stalk flow sensor for the tiny plant stalks, which can be attached to the surfaces of the plant stalks to be detected in different diameters in a self-adaptive manner and can be used for carrying out nondestructive continuous measurement on the stalk flow rate of the plant with thin stalks and short internodes.
The technical scheme adopted by the invention for overcoming the technical problems is as follows:
the invention provides a miniature stalk flow sensor for plant fine stalks, which at least comprises a flexible measuring part and a control part; the flexible measuring part at least comprises a flexible base material, a heating module and a temperature measuring module, wherein the heating module and the temperature measuring module are arranged on the flexible base material; the control part at least comprises a control communication module and a plurality of leads, and the control communication module is connected with the heating module and the temperature measuring module through the leads;
further, when the flexible measuring part is attached to the surface of the stalk to be measured, the heating module and the temperature measuring module are arranged on two sides of the axial section of the stalk, wherein the axial section is parallel to a tangent plane where the central point of the heating position on the surface of the stalk is located.
In order to reduce the influence of the heating module on the temperature measurement of the temperature measurement module, a relative distance is required to be arranged between the heating module and the temperature measurement module.
Furthermore, the temperature measuring module at least comprises two temperature sensors which are arranged in the front and back direction of the stem flow in the stem, and the heating module at least comprises a heating element arranged between the temperature sensors.
Furthermore, the flexible base material is arranged to be of a Y-shaped structure, the heating module is arranged on a first branch of the Y-shaped structure, and the temperature measuring module is arranged on a second branch of the Y-shaped structure.
The heating module and the temperature measurement module are respectively located on different branches, so that the direct influence of the heating module on the temperature measurement of the temperature measurement module can be reduced, and the measurement accuracy of the stem flow rate is improved.
Furthermore, the flexible base material is provided with a plug connector for connecting the control communication module.
The plug is movably or fixedly connected with the control communication module.
Furthermore, the lead is prepared in a mode of laser etching of the metal film and is arranged on the flexible substrate.
Further, the control communication module is used for controlling the working state of the heating module, collecting temperature data detected by the temperature measurement module and calculating the stem flow rate.
The device comprises a micro stem flow sensor, a heating module and a temperature measuring module, wherein the micro stem flow sensor is attached to the surface of a plant stem to be measured, the heating module and the temperature measuring module are respectively positioned on two sides of an axial section of the stem, and the axial section is parallel to a tangent plane where the central point of the heating position on the surface of the stem is located.
Through fixing device, dress miniature stem flow sensor in plant stem stalk surface, reliably fix the sensor position.
Furthermore, the fixing device comprises a first fixing part, a second fixing part and a connecting piece which are oppositely arranged; the first fixing part and the second fixing part are fixedly connected with the outer surface of the micro stem flow sensor respectively; the connecting piece is used for regarding the one end swing joint of first fixed part and second fixed part as the expansion end, and other end fixed connection is as the stiff end, and miniature stem flow sensor passes through the expansion end and installs to the plant surface that awaits measuring.
Furthermore, the connecting piece comprises a plurality of rubber rings and a plurality of buckling strips; the surface of the fixing piece is provided with a clamping groove, and the rubber ring is correspondingly clamped into the fixing piece clamping groove in the first fixing part and the second fixing part; the buckle strip is clamped into the fixing piece clamping groove corresponding to the fixed end.
Furthermore, the fixing device comprises a shell, two clamping blocks arranged in the shell, pressing structural parts at two ends, a plurality of elastic parts arranged between the clamping blocks and the inner wall of the shell, and buttons arranged at two ends of the shell and connected with the pressing structural parts; two opposite side surfaces of the shell are correspondingly provided with slits; the clamping blocks are movably connected with the corresponding pressing structural parts; the pressing button drives the pressing structural part to separate the clamping blocks to form a gap, pressure is applied to the elastic part, the flexible base material of the micro stem flow sensor penetrates through the slit and the gap, and after the pressing button is released, the rebound force of the elastic part enables the clamping blocks to clamp and fix the flexible base material.
Furthermore, the upper side surface and the lower side surface of the shell are respectively provided with a first slit, the front side surface and the rear side surface are respectively provided with a second slit, and each clamping block is provided with a through slit corresponding to the first slit; the flexible base material is provided with a graduated scale, and the scales of the graduated scale can be observed through the first slit and the middle slit; the flexible base material penetrates through the crack and the second slit, and the position clamped by the scale is observed through the first slit and the middle slit, so that the positions of the heating module and the temperature measuring module are adjusted.
The invention has the beneficial effects that:
1. the miniature stem flow sensor provided by the invention adopts flexible materials which can be attached to the surface of the plant stem in a self-adaptive manner;
2. according to the invention, the temperature measuring module and the heating module are arranged on two sides of the stem (in a nonlinear arrangement), so that the direct interference of the heating module on the temperature measuring module is avoided, the measurement accuracy is improved, and the overall size of the sensor is reduced.
3. By adopting the micro-size temperature measurement module and the heating module and adopting a non-invasive measurement method, the nondestructive continuous measurement can be carried out on the stem flow rate of the plant with slender stems and extremely short internodes.
4. Through the small-size, light in weight's fixing device, wear in plant stem stalk surface with the stem flow sensor, the fixed sensor position for measure more accurately.
Drawings
Fig. 1 is a front view of a micro stem flow sensor shown according to a first embodiment;
FIG. 2 is a rear view of the micro stem flow sensor shown in accordance with the first embodiment;
FIG. 3 is an exploded view of the components of the micro stem flow sensor according to the first embodiment;
FIG. 4 is a schematic diagram showing a phase relationship between a heating module and a temperature measuring module according to the first embodiment;
FIG. 5 is a schematic view showing the structure of a first flexible substrate according to a first embodiment;
FIG. 6 is a schematic diagram showing a second flexible substrate structure according to the first embodiment;
FIG. 7 is a schematic view showing the structure of a third flexible substrate according to the first embodiment;
FIG. 8 is a schematic structural view showing a flexible substrate of a micro-stem flow sensor coupled to a communication module according to a first embodiment;
FIG. 9 is a schematic view showing the relative positions of a heating module and a temperature measuring module on the surface of a plant stalk to be measured when the micro stalk flow sensor according to the first embodiment is installed on the surface of the stalk;
FIG. 10 is a schematic view showing a micro stem flow sensor according to the first embodiment mounted on the surface of a plant stem to be measured through a hollow foam tube;
FIG. 11 is a schematic view of a first fixing device according to a second embodiment;
FIG. 12 is a schematic view showing an installation structure of the fixing member and the flexible sheet deformable according to the second embodiment;
FIG. 13 is a schematic view showing a first fixing means for fixing a micro stalk flow sensor to the surface of plant stalks of different diameters according to the second embodiment;
FIG. 14 is a schematic structural view showing a second fixing apparatus according to a third embodiment;
FIG. 15 is a schematic view showing the structure of a second fixing device according to the third embodiment when buttons on both sides are pressed;
FIG. 16 is a schematic view showing the structure of the third embodiment in which a micro stalk flow sensor is mounted on the surface of a plant stalk by means of a fixing means;
FIG. 17 is a graph showing the continuous monitoring of the stem flow rate of a live watermelon plant for one week using the apparatus of the present invention in accordance with the fourth embodiment;
in the figure, 1-micro stem flow sensor; 11-a flexible substrate; 110-flexible circuit board connector; 111-a first branch of the flexible substrate; 112-a second branch of the flexible substrate; 113-a fixed part; 114-a through hole; 12-a wire; 13-heating module; 131-heating position center point; 14-a temperature measuring module; 15-a temperature sensor; 16-holes; 17-flat cable; 18-a conductive substance; 19-control the communication module; 2-a first fixing means; 21-a cylinder; 22-rubber ring; 23-a snap strip; 24-a flexible sheet; 25-a card slot; 3-a second type of fixing means; 31-a housing; 32-a first slit; 33-a second slit; 34-a button; 35-a spring; 36-a through slot; 37-trapezoidal clamping blocks; 38-pressing the structure; 4-plant stalks; 41-a tangent plane of the central point of the heating position on the surface of the stalk; 42-axial section; 5-direction of stem flow; 6-hollow foam tubes; 7-adhesive tape; 8-bonding.
Detailed Description
In order that the invention may be better understood by those skilled in the art, further details of the invention are set forth in the following description and in the accompanying drawings, several embodiments of the application are described in the following description with reference to the drawings. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present application. The following detailed description should not be taken in a limiting sense, and the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Although the terms first, second, etc. may be used herein to describe various components or elements in some embodiments, these components or elements should not be limited by these terms, which are only used to distinguish one component or element from another.
Example 1
As shown in fig. 1 to fig. 3, the schematic structural diagram of the micro stalk flow sensor for plant fine stalks according to the present embodiment includes a flexible measuring portion and a control portion, wherein the flexible measuring portion includes a flexible substrate 11, a heating module 13 and a temperature measuring module 14 disposed on the flexible substrate, the heating module 13 and the temperature measuring module 14 are attached to the surface of the stalk to be measured through the flexible substrate 11, and the control portion includes a control communication module 19 and a plurality of wires 12 disposed on the flexible substrate 11.
When the heating module and the temperature measuring module are attached to the surface of the stalk to be measured by the flexible substrate, as shown in fig. 4, the heating module 13 and the temperature measuring module 14 are arranged on two sides of an axial section 42, wherein the axial section 42 is parallel to a tangent plane 41 where the central point of the heating position on the surface of the stalk is located.
In one embodiment of the invention, the temperature measuring module comprises at least two temperature sensors, when the heating module and the temperature measuring module are attached to the surface of the stem to be measured through the flexible substrate, the temperature sensors are arranged in the front and back direction of the stem flow direction of the plant stem, and the heating module is positioned between the temperature sensors.
The flexible base material comprises a plurality of branches, and the heating module and the temperature measuring module are respectively arranged on different branches.
As shown in FIG. 3, the flexible substrate includes two branches, the heating module 13 is disposed on a first branch 111 of the flexible substrate, and the thermometry module 14 is disposed on a second branch 112 of the flexible substrate. The control communication module 19 sends a heating control command to the heating module 13, heat generated by heating of the heating module 13 is transferred along with the direction of the stem flow, the control communication module 19 collects the temperature detected by the temperature measurement module 14 to obtain a temperature difference, and the stem flow speed is calculated according to the temperature difference, wherein the temperature difference is the temperature difference between the upstream and downstream of the heating module along the axial direction of the stems, which is caused by the stem flow.
In one embodiment of the present invention, the flexible substrate 11 has a Y-shaped structure, wherein two branches of the flexible substrate respectively correspond to two branches of the Y-shaped structure and are connected to the fixing portion 113 at the tail end of the Y-shape.
In some embodiments, the flexible substrate may also be an unbranched structure, as shown in fig. 5.
As shown in fig. 6 and 7, the flexible substrate may have a T-shaped structure, and the heating module and the thermometry module may be arranged as shown in fig. 6 or 7. Besides, the heating modules and the thermometric modules are not limited to the arrangement shown in FIGS. 5-7, and the arrangement shown in FIGS. 5-7 is merely schematic illustration of the location distribution of the heating modules and the thermometric modules, and the shape of the flexible substrate.
The heating module and the temperature measuring module can be arranged on the same branch of the flexible substrate, or on different branches, or on the same side or different sides, or in point contact or line contact with the surface of the plant stem to be measured, and both the heating and the temperature acquisition of the plant stem flow can be realized.
In one embodiment of the invention, the branches of the flexible substrate are integrally formed of a flexible material. The material used for the flexible substrate 11 is high molecular polymer Polydimethylsiloxane (PDMS) and is obtained by curing in a mold.
It should be noted that the flexible substrate 11 may be replaced by other materials, which are not limited to the above materials, and the above materials have high market share and mature process, so this embodiment is described based on this.
The outer surfaces of two sides of the flexible base material 11 are provided with the conducting wires 12 in a mode of etching the metal film by laser, and through holes 114 are drilled in the positions, corresponding to the heating module and the temperature measuring module, of the flexible base material 11, so that the heating module 13 and the temperature measuring module 14 are embedded into the through holes 114 for installation.
In one embodiment of the present invention, the heating module 13 and the thermometric module 14 are fixed in the through hole 114 by the conductive silver paste 18 and are electrically connected to the lead wires 12.
It should be noted that the conducting wire 12 may be a stretchable conducting wire, which can be better adapted to plant stalks of different thicknesses, and especially, in case of thick stalks, attaching the micro stalk flow sensor to the stalks will cause the substrate of the flexible substrate to deform, so that by using the stretchable conducting wire, a good circuit connection can be ensured even in case of being stretched.
In some embodiments, the wire is prepared by laser etching a metal film. Other processes such as photolithography, screen printing, chemical etching, etc. may also be used.
In some embodiments, the thicknesses of the heating module 13 and the thermometry module 14 are selected to correspond to the thicknesses of the first branch 111 and the second branch 112 of the flexible substrate, respectively. The heating module 13 is a micro heating module, and adopts a PTC thermistor, and the size is 1.6 mm in length, 0.8 mm in width and 0.7 mm in height.
The temperature measuring module 14 comprises at least two identical miniature temperature sensors 15, the model of which is TMP112, and the dimensions are 1.6 mm in length, 1.2 mm in width and 0.7 mm in height.
In some embodiments, the fixing portion 113 is provided with a flat cable 17 formed on the flexible substrate by laser etching a metal film at an end thereof away from the flexible heating module and the thermometric module.
As shown in fig. 3, two holes 16 are formed at specific positions on the fixing portion 113, and a conductive material 18, such as conductive silver paste, is injected into the holes to electrically connect the wires 12 on one side with the flat cables 17 on the other side.
In some embodiments, the flat cable 17 is integrally connected to the wires 12 on the same side, and is prepared by laser etching a conductive metal film.
As shown in fig. 8, the fixed end 113 is reinforced on a side different from the flat cable 17, and then electrically connected to the control communication module 19 through the flexible circuit board connector 110.
In some embodiments, the fixing portion 113 is reinforced on a side different from the flat cable 17 to form a plug for plugging to the flexible circuit board connector 110 disposed on the control communication module 19. The flexible substrate 11 and the control communication module 19 are movably or fixedly connected.
As shown in fig. 9, the micro stalk flow sensor 1 is installed on a plant stalk to be measured, the heating module 13 and the temperature measuring module 14 can be attached on the surface of the stalk to be measured through a flexible substrate, the heating module 13 and the temperature measuring module 14 are arranged on both sides of an axial cross section of the stalk, wherein the axial cross section is parallel to a tangent plane where a central point of a heating position on the surface of the stalk is located. And the temperature sensors are arranged in the front and back direction of the stem flow, and the heating module is arranged between the temperature sensors.
In some embodiments, the heating module 13 and the temperature measuring module 14 are attached to both sides of an axial cross section of the surface of the stalk to be measured, which is parallel to the tangential plane of the surface heating center point of the stalk, as shown in fig. 9, wherein the distance between the center of the heating module and the center of the temperature sensor along the axial direction of the plant stalk is L. In the embodiment of the present invention, the distance L between the two micro temperature sensors 15 in the thermometry module 14 is 1 cm, and when the first branch 111 of the flexible substrate and the second branch 112 of the flexible substrate are aligned and attached, the distance from the heating module 13 to the two micro temperature sensors 15 is equal.
It should be noted that the temperature measuring module and the heating module are arranged on two sides of the stem (in a nonlinear arrangement), and an appropriate distance is ensured, the distance can be from 5mm to 2cm, the direct interference of the heating module on the temperature measuring module is avoided, and the overall size of the sensor is reduced while the measurement accuracy is improved.
The invention also comprises a fixing device for fixing the miniature stem flow sensor 1.
In some embodiments, the micro stem flow sensor is mounted on the surface of the plant stem through a hollow foam tube, the hollow foam tube is cut into two parts, the flexible substrate 11 is attached to the inner surface of the hollow foam tube, the two parts of the hollow foam tube are used for wrapping the hollow foam tube on the surface of the plant stem to be measured, and the two parts of the hollow foam tube are attached to the opening of the two parts of the hollow foam tube through an adhesive tape, as shown in fig. 10. At this time, the heating module 13 and the temperature measuring module 14 are respectively positioned at two sides of the surface of the plant stem, and the relative positions of the heating module 13 and the temperature measuring module 14 on the surface of the plant stem 4 are shown in fig. 9. The heat generated by the heating module 13 during operation can be transmitted along with the direction of the stem flow in the stem in an anisotropic manner, the temperature change is respectively measured by two temperature sensors 15 which are arranged at equal intervals between the upstream and downstream of the heating module 13, the temperature difference is calculated, and the stem flow rate of the plant is calculated by the temperature difference.
The fixing device can fix and attach the miniature stalk flow sensor 1 on the surfaces of plant stalks with different diameters, so that the heating module 13 and the temperature measuring module 14 are respectively arranged on two sides of the axial section of the stalks, wherein the axial section is parallel to a tangent plane where the central point of the heating position on the surface of the stalks is located.
Example 2
In another embodiment of the fixing device of the present invention, a schematic structural diagram of the first fixing device 2 is shown in fig. 11, and includes a first fixing portion and a second fixing portion, which are oppositely disposed, and a connecting member.
Wherein, the first/second fixing part comprises a deformable soft sheet 24 and fixing parts 21 fixedly connected with two ends of the deformable soft sheet respectively. The connecting piece comprises a plurality of snap strips 23 and a plurality of rubber rings 22.
Two fixing parts are arranged at the left and right ends of the deformable soft sheet 24 and fixedly connected with the deformable soft sheet to form a fixing part, and two same fixing parts are arranged in an up-and-down symmetrical mode to form the first fixing device 2.
The inner surface of the flexible sheets 24 is attached to the flexible substrate of the micro-stem flow sensor 1, wherein one flexible sheet 24 is attached to a first branch of the flexible substrate and the other flexible sheet 24 is attached to a second branch of the flexible substrate.
The mounting surface is equipped with draw-in groove 25, and two parts about first fixed part and the second fixed part clamp through rubber circle 22 and adorn two link of laminating formation in the draw-in groove 25 of two mountings 21 about supreme, and wherein, a link is as the stiff end, and buckle strip 23 is gone into respectively in the draw-in groove 25 of card income cylinder, and fixed part 113 is worn out from stiff end one side, and another link is as the expansion end, installs to the vegetation stem stalk that awaits measuring through the expansion end.
In some embodiments, the fixing member is a cylinder, and as shown in fig. 12, two cylinders with wedge-shaped slots are connected with a flexible sheet 24 by gluing or nailing to form the upper and lower parts of the first fixing device 2.
In use, the first branch 111 of the flexible substrate and the second branch 112 of the flexible substrate are adhered to the inner sides of the flexible sheet 24 of the first fixing portion and the second fixing portion, respectively, with double-sided adhesive tape. During adhesion, the heating module 13 and the temperature measuring module 14 fixedly installed on the flexible substrate of the micro stem flow sensor 1 need to be attached to the midpoint line position of the deformable soft sheet 24, namely the dotted line position in fig. 11.
After adhering flexible substrate 1 and first kind of fixing device 2, as shown in fig. 11, the plant stem stalk that will await measuring is cliied with first fixing device 2's expansion end earlier, it is tight to provide shrink pulling force with rubber ring 22 card in draw-in groove 25 again, it is tight to block buckle strip 23 in wedge draw-in groove 25 again, prevent that rubber ring 22 roll-off from droing, the cylinder that the fixed part 113 of miniature stem flow sensor 1 set up from top to bottom through the thin slice mounting that lies in the right side in fig. 11 is tight, it is tight to provide shrink pulling force with rubber ring 22 card in draw-in groove 25 again. If the micro stalk flow sensor 1 is detached from the plant stalk to be measured, the rubber ring 22 at one side of the active end in the drawing is detached first, so that the upper and lower cylinders of the active end are separated, and the micro stalk flow sensor 1 is detached from the surface of the plant stalk to be measured.
It should be noted that the first fixing device 2 is connected with the micro stem flow sensor to form a whole, and the sensor can be mounted by directly mounting the first fixing device 2 on the plant stem to be measured in the next use.
Because the deformable soft thin sheet 24 can be adaptive to the surfaces of the stalks with different diameters to finish deformation attachment, and the rubber rings 22 on the two sides provide completely same pulling force, the miniature stalk flow sensor 1 is installed by utilizing the first fixing device 2, and the positions of the heating module 13 and the temperature measuring module 14 can be ensured to be respectively positioned on the two sides of the axial section of the tangent plane parallel to the surface heating central point of the plant stalk to be detected and the surface heating central point of the stalk. Fig. 13 is a schematic view showing the installation of the micro stem flow sensor 1 on the surface of plant stalks of different diameters using the first fixing means 2.
In some embodiments of the present invention, the locking groove disposed on the side of the cylinder 21 is wedge-shaped, the corresponding fastener is also wedge-shaped, and both the cylinder 21 and the fastener strip 23 are made of a polyvinyl chloride mold.
The first fixing device 2 of the miniature stem flow sensor 1 for the small plant stems provided by the embodiment can attach and install the miniature stem flow sensor 1 on the surface of the plant stems, and the miniature stem flow sensor 1 can perform nondestructive continuous measurement on the plant stem flow rate with thin stems and extremely short internodes. The first fixing device 2 is suitable for plant stalks with the diameter within the range of 2 mm-1 cm, and after the device is installed, the positions of the temperature measuring module 14 and the micro heating module 13 of the micro stalk flow sensor 1 can be respectively positioned at two sides of the axial section of the plant stalk to be measured, wherein the axial section is parallel to a tangent plane where the central point of the surface heating position of the stalk is positioned.
Example 3
In another embodiment of the present invention, another fixing device for a micro stalk flow sensor for plant fine stalks is further included, and a schematic structural diagram of the second fixing device 3 is shown in fig. 14, and includes a housing 31, two trapezoidal clamping blocks 37 disposed inside the housing 31, and springs 35 respectively disposed between the trapezoidal clamping blocks 37 and an inner wall of the housing 31, wherein the housing 31 is provided with first slits 32 on upper and lower sides, second slits 33 on front and rear sides, buttons 34 on left and right sides, each trapezoidal clamping block 37 is provided with a through slit 36 corresponding to the first slit, and a pressing structural member 38 is movably connected to the trapezoidal clamping blocks 37.
In some embodiments, four springs 35 are distributed inside the housing 31, each two springs 35 are respectively connected to two trapezoidal clamping blocks 37, and the button 34 is connected to the pressing structure 38. The press structure 38 is wedge shaped. When the buttons 34 on the left and right sides of the rectangular parallelepiped housing 31 are pressed, the pressing structures 38 connected to the buttons 34 are forced inward, and at the same time, the trapezoidal clamping blocks 37 are spread apart, and a gap is formed therebetween, and the spring 35 is in a compressed state, as shown in fig. 15. When the button 34 is released and the pressure applied to the button 34 is removed, the trapezoidal clamping blocks 37 are restored to the original positions under the repulsive force of the spring 35, i.e., the state shown in fig. 14.
In some embodiments, as shown in fig. 16, two second fixing means 3 are used to fix the micro stalk flow sensor 1 to the surface of the stem 4 of a plant to be measured. The first branch 111 of the flexible substrate and the second branch 112 of the flexible substrate of the micro stem flow sensor 1 are marked with scales, respectively. Pressing the buttons 34 on both sides of the second fixing device 3 opens the trapezoidal clamping blocks 37 to create a gap, passing the flexible substrate of the micro stem flow sensor 1 through the gap, and then releasing the buttons 34 to fix the fixing portions 113 of the micro stem flow sensor 1. Then the stalk flow sensor marked with scales is attached to the surface of the stalk to be detected, buttons 34 on two sides of another second fixing device 3 are pressed to enable the trapezoidal clamping block 36 to be opened to generate a gap, a first branch 111 of the flexible substrate and a second branch 112 of the flexible substrate penetrate through a second slit 33 on another second fixing device 3, the scales on the surface of the stalk flow sensor are observed through the first slit 32 to adjust the position of the second fixing device, and finally the distance from the two fixing devices to the position where the heating module 13 and the temperature measuring module 14 are located on the sensor is equal, so that the positions of the heating module 13 and the temperature measuring module 14 can be always located on two sides of the axial section of the stalk to be detected respectively, wherein the axial section is parallel to the stalk surface tangent plane where the central point of the heating module is located.
It should be noted that, several fixing devices mentioned in the present invention are made of materials with relatively low density, and have the weight of only a few grams, the length, width and height of less than 2cm, small size and light weight, and can be applied to the stems of the tiny plants of melon and vine, such as the vines of watermelon, melon, grape, etc.
The stem flow rate of living plants is continuously monitored by using the miniature stem flow sensor and the fixing device. Experimental data measured for one consecutive week are provided to confirm the effectiveness of the present invention.
Watermelon plants are planted in an artificial greenhouse, day and night switching is realized in the greenhouse by regularly controlling the light intensity of an irradiation lamp simulating a solar light source and the indoor temperature, the stem flow sensor is arranged on a watermelon stem to be measured through a fixing device, the diameter of the watermelon stem is 4 mm, the stem flow rate change condition of the watermelon plants in one week is continuously measured, and the stem flow rate change is shown in a graph 17. Experimental results show that the method can measure the stem flow rate change of the living plants for a long time.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The system and the system embodiments described above are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Claims (12)
1. A miniature stem flow sensor for plant fine stems is characterized by at least comprising a flexible measuring part and a control part;
the flexible measuring part at least comprises a flexible base material, a heating module and a temperature measuring module, wherein the heating module and the temperature measuring module are arranged on the flexible base material;
the control part at least comprises a control communication module and a plurality of leads, and the control communication module is connected with the heating module and the temperature measuring module through the leads.
2. The micro stem flow sensor for the small plant stems as claimed in claim 1, wherein the heating module and the temperature measuring module are arranged on two sides of an axial section of the stem when the flexible measuring part is attached to the surface of the stem to be measured, wherein the axial section is parallel to a tangent plane where a central point of a heating position on the surface of the stem is located.
3. The micro stem flow sensor for plant fine stalks of claim 1, wherein the temperature measuring module comprises at least two temperature sensors arranged back and forth in a stem flow direction in the stalks, and the heating module comprises at least one heating element arranged between the temperature sensors.
4. The micro stem flow sensor for plant fine stems as claimed in claim 1, wherein the flexible substrate is provided in a Y-shaped configuration, the heating module is provided at a first branch of the Y-shaped configuration, and the temperature measuring module is provided at a second branch of the Y-shaped configuration.
5. The miniature stalk flow sensor for plant fine stalks of claim 1 wherein said flexible substrate is provided with a connector for connecting to said control and communication module.
6. The micro stem flow sensor for the fine stems of plants according to claim 1, wherein the wire is prepared by laser etching a conductive metal thin film and is disposed on the flexible substrate.
7. The micro stem flow sensor for plant fine stems as claimed in claim 1, wherein: the control communication module is used for controlling the working state of the heating module, collecting temperature data detected by the temperature measurement module and calculating the stem flow rate.
8. The micro stalk flow sensor for plant fine stalks according to any one of claims 1 to 7 further comprising a fixing means for attaching the micro stalk flow sensor to a surface of a plant stalk to be measured such that the heating module and the temperature measuring module are respectively located on both sides of an axial section of the stalk, wherein the axial section is parallel to a tangential plane in which a center point of a heating position of the surface of the stalk is located.
9. The micro stem flow sensor for plant fine stems as claimed in claim 8, wherein:
the fixing device comprises a first fixing part, a second fixing part and a connecting piece which are oppositely arranged;
the first fixing part and the second fixing part are fixedly connected with the outer surface of the micro stem flow sensor respectively;
the connecting piece is used for regarding the one end swing joint of first fixed part and second fixed part as the expansion end, and other end fixed connection is as the stiff end, and miniature stem flows the sensor and passes through the expansion end and install to the plant surface that awaits measuring.
10. The micro stem flow sensor for plant fine stems as claimed in claim 9, wherein:
the connecting piece comprises a plurality of rubber rings and a plurality of buckling strips;
the surface of the fixing piece is provided with a clamping groove, and the rubber ring is correspondingly clamped into the fixing piece clamping grooves in the first fixing part and the second fixing part;
the buckle strip is clamped into the fixing piece clamping groove corresponding to the fixed end.
11. The miniature stalk flow sensor for plant fine stalks according to claim 9 wherein:
the fixing device comprises a shell, two clamping blocks arranged in the shell, pressing structural parts at two ends, a plurality of elastic parts arranged between the clamping blocks and the inner wall of the shell, and buttons arranged at two ends of the shell and connected with the pressing structural parts;
two opposite side surfaces of the shell are correspondingly provided with slits;
the clamping blocks are movably connected with the corresponding pressing structural parts;
the pressing button drives the pressing structural part to separate the clamping blocks to form a crack, pressure is applied to the elastic part, the flexible base material of the micro stem flow sensor penetrates through the slit and the crack, and after the button is loosened, the rebound force of the elastic part enables the clamping blocks to clamp and fix the flexible base material.
12. The miniature stalk flow sensor for plant fine stalks of claim 11 wherein:
the upper side surface and the lower side surface of the shell are both provided with first slits, the front side surface and the rear side surface are both provided with second slits, and each clamping block is provided with a through slit corresponding to the first slit;
the flexible base material is provided with a graduated scale, and the scales of the graduated scale can be observed through the first slit and the middle slit;
the flexible base material penetrates through the crack and the second slit, and the position clamped by the scale is observed through the first slit and the middle slit, so that the positions of the heating module and the temperature measuring module are adjusted.
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| CN202211704985.7A CN115684504A (en) | 2022-12-29 | 2022-12-29 | Miniature stem flow sensor for plant fine stems |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117429528A (en) * | 2023-12-06 | 2024-01-23 | 浙江大学 | Magnetic drive soft climbing robot and plant physiological information sensing method |
| CN117761346A (en) * | 2024-02-22 | 2024-03-26 | 浙江大学 | multimode bistable structure stem flow measuring device suitable for different plant stems |
Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5367905A (en) * | 1993-06-30 | 1994-11-29 | Kansas State University Research Foundation | Sap flow gauge |
| JP2008233047A (en) * | 2007-03-23 | 2008-10-02 | Hamamatsu Kagaku Gijutsu Kenkyu Shinkokai | Stalk liquid flow measuring sensor, stalk liquid flow measuring device, and stalk liquid flow measurement method |
| CN102590279A (en) * | 2012-02-27 | 2012-07-18 | 中国农业大学 | Dielectric type plant stem flow detecting device |
| BE1020368A3 (en) * | 2012-01-13 | 2013-08-06 | Univ Gent | A METHOD FOR MEASURING JUICE FLOW, WATER CONTENT AND THERMAL PROPERTIES IN PLANTS. |
| US8590373B1 (en) * | 2010-06-07 | 2013-11-26 | Michael Van Bavel | Sap flow sensor apparatus |
| CN206637118U (en) * | 2017-02-21 | 2017-11-14 | 扬中市华电电力设备有限公司 | A kind of high stability suspension and support |
| US20190187072A1 (en) * | 2017-12-18 | 2019-06-20 | United Arab Emirates University | Plant water sensor |
| CN210108314U (en) * | 2019-05-19 | 2020-02-21 | 山西农业大学 | Plant stem diameter wireless sensor network monitoring device |
| CN111964627A (en) * | 2019-05-19 | 2020-11-20 | 山西农业大学 | Plant stem diameter wireless sensor network monitoring device |
| CN212622490U (en) * | 2020-07-15 | 2021-02-26 | 南京易知源检测技术有限公司 | Plant liquid flow detection device |
| CN212845257U (en) * | 2020-07-16 | 2021-03-30 | 河南大学 | Parcel formula plant stem flow meter |
| CN113267643A (en) * | 2021-06-24 | 2021-08-17 | 西南大学 | Trunk liquid flow non-invasive measurement device and method suitable for plant thin stems |
| CN215179852U (en) * | 2021-06-03 | 2021-12-14 | 浙江灏东科技有限公司 | Plant stem flow detection device |
| CN113865475A (en) * | 2021-09-23 | 2021-12-31 | 浙江大学 | Preparation method and application of bionic self-adaptive winding wearable sensor for monitoring diameter micro-change of plant stem |
| CN215530398U (en) * | 2021-01-04 | 2022-01-18 | 中国十七冶集团有限公司 | Trunk protection device for landscaping |
| CN216078610U (en) * | 2021-11-02 | 2022-03-18 | 北京海淀中京工程设计软件技术有限公司 | Low-temperature pre-tightening cold insulation pipe hoop |
| CN216201343U (en) * | 2021-10-22 | 2022-04-05 | 天津精工石油专用管件股份有限公司 | Petroleum pipeline coupling with sealing groove |
| CN216447536U (en) * | 2021-11-22 | 2022-05-06 | 潍坊昌大建设集团有限公司 | High temperature water pipe prevents inflation elastic fixation device |
| CN114631024A (en) * | 2019-11-01 | 2022-06-14 | 欧姆龙株式会社 | Plant biological body sensor |
| US20220221348A1 (en) * | 2021-01-13 | 2022-07-14 | Calvert Ventures LLC | Sap Flow Sensors |
-
2022
- 2022-12-29 CN CN202211704985.7A patent/CN115684504A/en active Pending
Patent Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5367905A (en) * | 1993-06-30 | 1994-11-29 | Kansas State University Research Foundation | Sap flow gauge |
| JP2008233047A (en) * | 2007-03-23 | 2008-10-02 | Hamamatsu Kagaku Gijutsu Kenkyu Shinkokai | Stalk liquid flow measuring sensor, stalk liquid flow measuring device, and stalk liquid flow measurement method |
| US8590373B1 (en) * | 2010-06-07 | 2013-11-26 | Michael Van Bavel | Sap flow sensor apparatus |
| BE1020368A3 (en) * | 2012-01-13 | 2013-08-06 | Univ Gent | A METHOD FOR MEASURING JUICE FLOW, WATER CONTENT AND THERMAL PROPERTIES IN PLANTS. |
| CN102590279A (en) * | 2012-02-27 | 2012-07-18 | 中国农业大学 | Dielectric type plant stem flow detecting device |
| CN206637118U (en) * | 2017-02-21 | 2017-11-14 | 扬中市华电电力设备有限公司 | A kind of high stability suspension and support |
| US20190187072A1 (en) * | 2017-12-18 | 2019-06-20 | United Arab Emirates University | Plant water sensor |
| CN210108314U (en) * | 2019-05-19 | 2020-02-21 | 山西农业大学 | Plant stem diameter wireless sensor network monitoring device |
| CN111964627A (en) * | 2019-05-19 | 2020-11-20 | 山西农业大学 | Plant stem diameter wireless sensor network monitoring device |
| CN114631024A (en) * | 2019-11-01 | 2022-06-14 | 欧姆龙株式会社 | Plant biological body sensor |
| CN212622490U (en) * | 2020-07-15 | 2021-02-26 | 南京易知源检测技术有限公司 | Plant liquid flow detection device |
| CN212845257U (en) * | 2020-07-16 | 2021-03-30 | 河南大学 | Parcel formula plant stem flow meter |
| CN215530398U (en) * | 2021-01-04 | 2022-01-18 | 中国十七冶集团有限公司 | Trunk protection device for landscaping |
| US20220221348A1 (en) * | 2021-01-13 | 2022-07-14 | Calvert Ventures LLC | Sap Flow Sensors |
| CN215179852U (en) * | 2021-06-03 | 2021-12-14 | 浙江灏东科技有限公司 | Plant stem flow detection device |
| CN113267643A (en) * | 2021-06-24 | 2021-08-17 | 西南大学 | Trunk liquid flow non-invasive measurement device and method suitable for plant thin stems |
| CN113865475A (en) * | 2021-09-23 | 2021-12-31 | 浙江大学 | Preparation method and application of bionic self-adaptive winding wearable sensor for monitoring diameter micro-change of plant stem |
| CN216201343U (en) * | 2021-10-22 | 2022-04-05 | 天津精工石油专用管件股份有限公司 | Petroleum pipeline coupling with sealing groove |
| CN216078610U (en) * | 2021-11-02 | 2022-03-18 | 北京海淀中京工程设计软件技术有限公司 | Low-temperature pre-tightening cold insulation pipe hoop |
| CN216447536U (en) * | 2021-11-22 | 2022-05-06 | 潍坊昌大建设集团有限公司 | High temperature water pipe prevents inflation elastic fixation device |
Non-Patent Citations (3)
| Title |
|---|
| YANGFAN CHAI, ET AL: "Cohabiting Plant-Wearable Sensor In Situ Monitors Water Transport in Plant" * |
| 陈楚奕: "非侵入式植物可穿戴茎流传感器研究" * |
| 龙秋波;贾绍凤;: "茎流计发展及应用综述" * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117429528A (en) * | 2023-12-06 | 2024-01-23 | 浙江大学 | Magnetic drive soft climbing robot and plant physiological information sensing method |
| CN117429528B (en) * | 2023-12-06 | 2024-03-19 | 浙江大学 | Magnetic drive soft climbing robot and plant physiological information sensing method |
| CN117761346A (en) * | 2024-02-22 | 2024-03-26 | 浙江大学 | multimode bistable structure stem flow measuring device suitable for different plant stems |
| CN117761346B (en) * | 2024-02-22 | 2024-07-16 | 浙江大学 | Multimode bistable structure stem flow measuring device suitable for different plant stems |
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