Dynamic plant stalk monitoring device and system

Abstract

The invention provides a dynamic plant stalk monitoring device and system. The device comprises a sensor mechanism and a self-adaptive fixing mechanism, the self-adaptive fixing mechanism is connected with the sensor mechanism; the sensor mechanism comprises a sensor group and a sensor original length automatic regulator; the sensor group comprises a flexible elastic resistance sensor and a flexible inelastic resistance sensor; the two sensors penetrate through the sensor original length automatic regulator; the sensor original length automatic regulator is used for moving under the pushing of the increase of the diameter of the plant stalk so as to synchronously increase the length of the sensing section of the flexible elastic resistance sensor and the length of the sensing section of the flexible non-elastic resistance sensor; the self-adaptive fixing mechanism is used for being matched with the sensing section of the sensor set in a self-adaptive mode so that the sensing section of the sensor set can be wound around and attached to plant stalks, and therefore the long-term accumulative error of the flexible sensor is reduced, and meanwhile the long-term and short-term monitoring precision from the seedling stage to the harvesting stage is improved.

Description

Technical Field

[0001] This application relates to the field of plant stem measurement technology, and more specifically, to a dynamic plant stem monitoring device and system. Background Technology

[0002] As plant stems grow, their diameter (circumference) gradually increases (ranging from 2 to 30 times, depending on the plant). Currently, flexible sensors are used to measure plant diameter (circumference). To achieve full-process monitoring of plants from seedling to harvest, the original length of the flexible sensor needs to be adjusted (i.e., after the plant stem has grown to a certain size, the clamping length of the flexible sensor is loosened, thus increasing the original length of the sensor). This increases the measurement range with the same stretching factor of the flexible sensor. However, this requires manual adjustment, which is extremely labor-intensive for large-scale dynamic monitoring of plant stems.

[0003] Furthermore, while manually adjusting and increasing the original length of the flexible sensor can address short-term (daily) changes, it also presents a problem: it is difficult to measure long-term changes in plant stems because it is hard to determine how much the original length has been increased.

[0004] Manual adjustments are not feasible due to high labor costs. Therefore, different flexible sensors are stretched at different ratios during the overall measurement process. The linearity of the flexible sensor is not an ideal value; the linearity varies at different stretching ratios, thus affecting the measurement accuracy.

[0005] If the original length is not adjusted and the stretching ratio of the flexible sensor is used to monitor plants from seedling stage to harvest, it is easy to exceed the range determined by the stretching range of the flexible sensor. This will also cause the stretching ratio range to be too large, resulting in the linearity of the sensor being in different stages. The linearity of different stages is different, which seriously affects the measurement accuracy. Summary of the Invention

[0006] In view of this, the purpose of this application is to provide a dynamic plant stem monitoring device and system that can reduce the long-term cumulative error of flexible sensors and improve the long-term and short-term monitoring accuracy from the seedling stage to the harvest stage.

[0007] This application provides a dynamic plant stem monitoring device, the device comprising: a sensor mechanism and an adaptive fixing mechanism; the adaptive fixing mechanism and the sensor mechanism are connected. The sensor mechanism includes a sensor group and an automatic sensor length adjuster; the sensor group includes a flexible elastic resistor sensor and a flexible non-elastic resistor sensor; the flexible elastic resistor sensor and the flexible non-elastic resistor sensor are arranged side by side and both pass through the automatic sensor length adjuster; the sensing segments of the flexible elastic resistor sensor and the flexible non-elastic resistor sensor are used to wrap around and conform to the plant stem; The sensor original length automatic adjuster is used to move under the impetus of the increase in the diameter of the plant stem, so as to synchronously increase the length of the sensing segment of the flexible elastic resistor sensor and the flexible inelastic resistor sensor. The adaptive fixing mechanism is used to adaptively match the sensing segments of the sensor group so that the sensing segments of the sensor group are wound around and attached to the plant stem.

[0008] In some embodiments, in the dynamic plant stem monitoring device, the adaptive fixing mechanism includes a state control base and two support belts, the state control base being connected to the fixed ends of the two support belts respectively; the number of sensor groups is two, which are respectively fixed on the two support belts. The free ends of the two support belts are provided with mutually cooperating closing buckles, and the belt bodies of the two support belts are respectively provided with multiple pairs of mutually cooperating fixing buckles. The two support straps form a fixed loop that adaptively matches the sensing segment of the sensor group based on the closing buckle and the fixing buckle, so that the sensing segment of the sensor group is wrapped around and attached to the plant stem through the fixed loop.

[0009] In some embodiments, in the dynamic plant stem monitoring device, both the closing latch and the fixing latch include a pair of magnets that attract each other, and multiple pairs of fixing latches are evenly arranged on the two support belts.

[0010] In some embodiments, in the dynamic plant stem monitoring device, the magnet includes two magnetic poles, adjacent magnetic poles on a single support strip have the same polarity to repel each other, and the magnetic poles of magnets at different positions on different support strips have opposite polarities to attract each other.

[0011] In some embodiments, in the dynamic plant stem monitoring device, the adaptive fixing mechanism is used to control the two support belts to switch between a straight state, an outward-opening state, and an inward-wrapping state through the state control base; In the outward-opening state, the magnets of the closing latches of the two support straps of the adaptive fixing mechanism attract each other, and the first part of the magnets of the fixing latch attract each other, forming a fixing ring in combination with the blocking effect of the outer diameter of the plant stem. The sensor segment of the sensor group is wound around and attached to the plant stem through the fixing ring, switching to the inward-wrapping state; the second part of the magnets of the fixing latch attract each other to adaptively adjust the circumference of the fixing ring.

[0012] In some embodiments, in the dynamic plant stem monitoring device, the support belt includes a magnet fixing belt and a pull rope; The magnet fixing band and the closing buckle and fixing buckle are fixedly connected to the magnet; The pull rope is connected to the state control base. The pull rope is movably inserted through the magnets of the closing lock and the fixing lock, so that the pull rope can be adjusted by the state control base to control the two support belts to switch between a straight state, an outward opening state and an inward wrapping state.

[0013] In some embodiments, the dynamic plant stem monitoring device includes a fixed block and a control block; The pull cord passes through the control block and is fixedly connected to the fixing block; the end of the magnet fixing strap is fixedly connected to the control block; The control block is used to adjust the length of the pull rope between the control block and the closing latch.

[0014] In some embodiments, in the dynamic plant stem monitoring device, the sensor original length automatic adjuster has a first channel and a second channel arranged side by side, the flexible elastic resistor sensor passes through the first channel, and the flexible inelastic resistor sensor passes through the second channel.

[0015] In some embodiments, in the dynamic plant stem monitoring device, the thickness of the flexible elastic resistor sensor is greater than the thickness of the flexible inelastic resistor sensor, and the thickness of the first channel is greater than the thickness of the second channel.

[0016] In some embodiments, a dynamic plant stem monitoring system is also provided, the system including the aforementioned dynamic plant stem monitoring device and monitoring platform; The monitoring platform is used to receive a first sensor signal from the flexible elastic resistor sensor and a second sensor signal from the flexible inelastic resistor sensor, and to determine first data of the plant stem at a first monitoring scale based on the first sensor signal, and to determine second data at a second monitoring scale based on the second sensor signal; the sampling time interval at the first monitoring scale is less than the sampling time interval at the second monitoring scale.

[0017] This application provides a dynamic plant stem monitoring device and system. The device includes a sensor mechanism and an adaptive fixing mechanism. The adaptive fixing mechanism is connected to the sensor mechanism. The sensor mechanism includes a sensor group and an automatic sensor length adjuster. The sensor group includes a flexible elastic resistor sensor and a flexible inelastic resistor sensor. The flexible elastic resistor sensor and the flexible inelastic resistor sensor are arranged side by side and both pass through the automatic sensor length adjuster. The sensing segments of the flexible elastic resistor sensor and the flexible inelastic resistor sensor are used to wrap around and conform to the plant stem. The automatic sensor length adjuster is used to move under the push of the increasing diameter of the plant stem to synchronously increase the length of the sensing segments of the flexible elastic resistor sensor and the flexible inelastic resistor sensor. The adaptive fixing mechanism is used to adaptively match the sensing segments of the sensor group so that the sensing segments of the sensor group wrap around and conform to the plant stem. In this invention, the flexible elastic sensor offers high short-term accuracy, sensitively capturing diurnal micro-changes in stems caused by water stress; the inelastic sensor exhibits good long-term stability, recording long-term stem growth and thickening without cumulative error. The fusion of the flexible elastic and inelastic resistive sensors overcomes the inherent limitation of a single sensor in achieving both long-term and short-term monitoring accuracy, while simultaneously improving measurement accuracy across both scales. The sensor's original length automatic adjuster passively moves under the influence of stem thickening, automatically and synchronously increasing the effective sensing segment length of both sensors without manual adjustment. This is not only convenient but also ensures that the flexible elastic sensor remains within its optimal linearity and highest sensitivity operating range throughout the growing season, while the flexible inelastic sensor accurately collects long-term growth data. This solves the problem of decreased measurement accuracy caused by insufficient range or deteriorated linearity in existing technologies, further improving the accuracy of plant stem circumference (diameter) monitoring. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This paper shows a top view of the dynamic plant stem monitoring device in its initial state as described in the embodiments of this application. Figure 2 A schematic diagram of the dynamic plant stem monitoring device in its installed state, as described in the embodiments of this application, is shown. Figure 3This shows a side view of the dynamic plant stem monitoring device in its initial state as described in an embodiment of this application. Figure 4 A schematic diagram of the structure of the sensor original length automatic adjuster described in an embodiment of this application is shown.

[0020] Explanation of reference numerals in the attached figures: 1. Flexible elastic resistor sensor; 2. Flexible inelastic resistor sensor; 3. Automatic sensor length adjuster; 301. First channel; 302. Second channel; 303. First main body; 304. Second main body; 4. Status control base; 401. Fixing block; 402. Control block; 5. Support belt; 501. Magnet fixing belt; 502. Pull rope; 6. Closing lock; 7. Fixing lock. Detailed Implementation To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the accompanying drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0021] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] It should be noted that the term "comprising" will be used in the embodiments of this application to indicate the presence of the features declared thereafter, but does not exclude the addition of other features.

[0023] The principle of stem diameter measurement is that when the rate of water loss through transpiration is greater than the rate of water absorption by the roots, the plant loses water, and the stem, as an organ for storing water, also loses water, resulting in a shrinkage in diameter. When the rate of water loss through transpiration reaches equilibrium with the rate of water absorption by the roots (or the rate of water absorption is greater than the rate of water loss), the water lost by the plant cells is replenished, the cells recover their expansion, and the stem diameter returns to its normal value. The expansion and contraction of plant stems are very sensitive to water deficit, so the slight changes in stem diameter can be used to detect the water status of plants.

[0024] Stem diameter changes are a more sensitive and effective indicator of water deficit stress in plants than stem flow, water potential, and transpiration rate. Different fruit tree species respond to water stress in two ways with subtle changes in stem diameter: in peach, plum, cherry, citrus, hawthorn, and jujube trees, the maximum daily stem shrinkage increases with increasing water stress, while in apple and grapevines it decreases. The correlation between stem diameter changes in grapevines and water status is highly dependent on changes during the growth stage.

[0025] Therefore, high-precision long-term and short-term measurements of stem diameter (circumference) changes are particularly important for monitoring plant growth, and have a greater ability to make judgments earlier than 2D observations of color and spectrum.

[0026] Existing technology uses flexible (elastic) sensors to monitor changes in plant stems. Flexible (elastic) sensors, without manual adjustment of the original length, exhibit high-magnification elongation monitoring, and the linear coefficient varies with different elongation ratios, leading to inaccurate long-term monitoring of plant stem diameter (circumference).

[0027] Moreover, manual adjustment is not suitable for large-scale long-term monitoring of plant stem dynamics; although the original length can be manually adjusted, the stem development of different plants cannot be completely consistent (even within the same batch), so it is difficult to ensure that the original length of the sensor is consistent by manually adjusting the original length.

[0028] Based on this, this application provides a dynamic plant stem monitoring device and system. The device includes a sensor mechanism and an adaptive fixing mechanism; the adaptive fixing mechanism is connected to the sensor mechanism; the sensor mechanism includes a sensor group and an automatic sensor length adjuster; the sensor group includes a flexible elastic resistor sensor and a flexible inelastic resistor sensor; the flexible elastic resistor sensor and the flexible inelastic resistor sensor are arranged side by side and both pass through the automatic sensor length adjuster; the sensing segments of the flexible elastic resistor sensor and the flexible inelastic resistor sensor are used to wrap around and conform to the plant stem; the automatic sensor length adjuster is used to move under the push of the increasing diameter of the plant stem to synchronously increase the length of the sensing segments of the flexible elastic resistor sensor and the flexible inelastic resistor sensor; the adaptive fixing mechanism is used to adaptively match the sensing segments of the sensor group so that the sensing segments of the sensor group wrap around and conform to the plant stem. The stem is characterized by its elasticity and inelasticity. The elastic sensor offers high short-term accuracy, sensitively capturing diurnal micro-changes in stems caused by water stress. The inelastic sensor provides long-term stability, recording long-term stem growth and thickening without cumulative error. By integrating the flexible elastic and inelastic sensors, the inherent limitations of a single sensor in achieving both long-term and short-term monitoring accuracy are overcome, while simultaneously improving measurement accuracy across both scales. The sensor's original length automatic adjuster moves passively under the influence of stem thickening, automatically and synchronously increasing the effective sensing segment length of both sensors without manual adjustment. This is not only convenient but also ensures that the flexible elastic sensor remains within its optimal linearity and highest sensitivity range throughout the growing season. The flexible inelastic sensor can also accurately collect long-term growth data, solving the problem of decreased measurement accuracy caused by insufficient range or deteriorated linearity in existing technologies, further improving the accuracy of plant stem circumference (diameter) monitoring.

[0029] Please refer to Figure 1 , Figure 1 This diagram shows a top view of the dynamic plant stem monitoring device in its initial state as described in the embodiments of this application; please refer to... Figure 2 , Figure 2 This diagram illustrates the structure of the dynamic plant stem monitoring device in its installed state according to an embodiment of this application; please refer to... Figure 3 , Figure 3 This illustration shows a side view of the dynamic plant stem monitoring device in its initial state as described in an embodiment of this application; Figure 1 , Figure 2 and Figure 3 As shown, the device includes: a sensor mechanism and an adaptive fixing mechanism; the adaptive fixing mechanism and the sensor mechanism are connected. The sensor mechanism includes a sensor group and an automatic sensor length adjuster 3; the sensor group includes a flexible elastic resistor sensor 1 and a flexible non-elastic resistor sensor 2; the flexible elastic resistor sensor 1 and the flexible non-elastic resistor sensor 2 are arranged side by side and both pass through the automatic sensor length adjuster 3; the sensing segments of the flexible elastic resistor sensor 1 and the flexible non-elastic resistor sensor 2 are used to wrap around and fit the plant stem. The sensor original length automatic adjuster 3 is used to move under the push of the increase in the diameter of the plant stem, so as to synchronously increase the length of the sensing segment of the flexible elastic resistor sensor 1 and the flexible inelastic resistor sensor 2. The adaptive fixing mechanism is used to adaptively match the sensing segments of the sensor group so that the sensing segments of the sensor group are wound around and attached to the plant stem.

[0030] The sensing segments of the flexible elastic resistor sensor 1 and the flexible inelastic resistor sensor 2 are the effective lengths that directly participate in measuring the change in circumference.

[0031] When the plant stem grows thicker, a thrust is applied to the sensor original length automatic adjuster 3, which moves the adjuster. When the sensor original length automatic adjuster 3 moves, it releases more length of the two sensors (flexible elastic resistor sensor 1 and flexible non-elastic resistor sensor 2) in a synchronous and equal manner, making them new "sensing segments". This enables the sensor group to achieve adaptive dynamic length adjustment without the need for manual length release.

[0032] The adaptive fixing mechanism can automatically adapt to the diameter change of the plant stem from thin to thick without the need for external manual adjustment, and always maintain a stable and gentle clamping, fixing the sensing segment of the sensor group to the plant stem.

[0033] The resistance value of the flexible elastic resistor sensor 1 changes with its own stretching degree; in this embodiment, it is used to detect the small diameter or circumference changes of the stem due to water balance in a short period of time (one day).

[0034] The flexible inelastic resistive sensor 2 has a resistance change that depends on the length change of the sensing segment, and is used to measure the long-term diameter or circumference change of the stem throughout the growing season.

[0035] In some embodiments, please refer to Figure 2 The number of flexible elastic resistor sensors 1 is two, and the number of flexible inelastic resistor sensors 2 is one. The flexible inelastic resistor sensor 2 is disposed between the two flexible elastic resistor sensors 1.

[0036] As the plant stem grows significantly over the months (while the daily diameter increase is small), a driving force is generated. Because the upper and lower flexible inelastic resistor sensors 2 are inelastic or have very little elasticity, the cumulative diameter increase (e.g., monthly accumulation) causes the portion of the stem covered by the flexible inelastic resistor sensors 2 to increase. This pushes the sensor original length automatic adjuster 3 to move outward, thus automatically reducing the length of the resistor not covering the stem. At the same time, since the flexible elastic resistor sensor 1 is located between the two flexible inelastic resistor sensors 2, the length of the resistor not covering the stem is reduced synchronously, while the original length of the flexible elastic resistor sensor 1 covering the stem is increased.

[0037] This achieves the goal of automatically changing the original length of the flexible elastic resistor sensor 1, enabling it to measure the circumference of the stem with high precision within a relatively fixed linearity range.

[0038] The changes in the plant's circumference mainly manifest in two parts. One is the cumulative change in circumference over a long period, such as weeks or months, which is relatively macroscopic. The other is the daily cyclical change in the stem caused by transpiration due to weather, sunlight, and other factors within 24 hours. This change is relatively small and more microscopic.

[0039] Therefore, in this embodiment, two types of sensors are used to address measurements at two different scales. One is a flexible, inelastic resistive sensor 2, which, in conjunction with the automatic stem length adjuster 3, can only measure the circumferential and monthly stem thickening of the plant stem. A significant force is required to move the automatic stem length adjuster 3 and change the value of the flexible, inelastic resistive sensor 2. Because it lacks elasticity, it can accurately measure large-scale changes in stem circumference. The other is a flexible, elastic sensor. Due to transpiration, plant stems exhibit periodic changes, which are relatively subtle. While the flexible, elastic sensor can measure these subtle changes, it struggles to accurately measure large-scale changes. The dynamic plant stem monitoring device described in this embodiment combines the advantages of both sensors, enabling simultaneous measurement of weekly, monthly, and daily stem circumference changes. Furthermore, under the action of the automatic stem length adjuster 3, as the plant stem diameter increases, long-term measurement accuracy is ensured.

[0040] Please refer to Figure 4 , Figure 4 A schematic diagram of the structure of the sensor original length automatic adjuster 3 according to an embodiment of this application is shown; as follows: Figure 4 As shown, in some embodiments, the sensor original length automatic adjuster 3 has a first channel 301 and a second channel 302 side by side, the flexible elastic resistor sensor 1 passes through the first channel 301, and the flexible non-elastic resistor sensor 2 passes through the second channel 302.

[0041] In some embodiments, in the dynamic plant stem monitoring device, the thickness of the flexible elastic resistor sensor 1 is greater than the thickness of the flexible inelastic resistor sensor 2, and the thickness of the first channel 301 is greater than the thickness of the second channel 302.

[0042] Please refer to Figure 4 In some embodiments, the sensor original length automatic adjuster 3 includes a first body 303 and a second body 304. The first body 303 and the second body 304 are made of magnetic material, and their opposite surfaces are designed with a matching structure.

[0043] After the first body 303 and the second body 304 are attracted together, they together form the first channel 301 and the second channel 302 side by side.

[0044] In some embodiments, iron baffles are provided at both ends of the sensor original length automatic adjuster 3 to better fix the first body 303 and the second body 304 that are attracted together.

[0045] The opposing surfaces of the first body 303 and the second body 304 are designed with matching shapes. For example, they can be mutually mating stepped structures or mutually mating groove-protrusion structures.

[0046] Please refer to Figure 2 The adaptive fixing mechanism includes a state control base 4 and two support belts 5. The state control base 4 is connected to the fixed ends of the two support belts 5 respectively. The number of sensor groups is two, which are fixed on the two support belts 5 respectively. The free ends of the two support belts 5 are provided with mutually cooperating closing buckles 6, and the belt bodies of the two support belts 5 are provided with multiple pairs of mutually cooperating fixing buckles 7. The two support straps 5 form a fixed ring that adaptively matches the sensing segment of the sensor group based on the closing buckle 6 and the fixing buckle 7, so that the sensing segment of the sensor group is wrapped around and attached to the plant stem through the fixed ring.

[0047] The state control base 4 has two functions: first, to fix the two support belts 5; and second, to control the state of the two support belts 5, specifically, to control the two support belts 5 in a straight state. Figure 1 (as shown), opening outwards, wrapping inwards ( Figure 2 Switch between the states shown.

[0048] The two support straps 5 form a fixed ring that adaptively matches the sensing segment of the sensor group based on the closing buckle 6 and the fixed buckle 7. Specifically, the closing buckle 6 is folded down to connect the free ends of the two support straps 5, and the fixed buckle 7 at the end away from the closing buckle 6 is selectively locked to form a fixed ring extending from the free end of the support straps 5.

[0049] Based on the initial diameter of the plant stem, a suitable locking buckle 7 is selected for locking, forming a fixed ring with an initial circumference. At this time, the sensing segment of the sensor group is constrained and pressed tightly against the stem surface, and is in a measuring state. As the plant stem continues to grow, its diameter continues to increase, expanding the fixed ring and automatically opening a set of closing locking buckles 6. The size of the fixed ring is adaptively adjusted, which also matches the length of the sensor group released by the sensor original length automatic adjuster 3 as the plant stem continues to grow.

[0050] For example, the fixing buckle 7 can be a snap-fit ​​buckle, which can be opened and released when the plant stem expands the fixing ring.

[0051] In the embodiments of this application, please refer to Figure 1 and Figure 2 The closing latch 6 and the fixing latch 7 each include a pair of magnets that attract each other, and multiple pairs of fixing latches 7 are evenly arranged on the two support belts 5.

[0052] In some embodiments, the magnet includes two magnetic poles, adjacent magnetic poles on a single support strip 5 have the same polarity to repel each other, and the magnetic poles of magnets at different positions on different support strips 5 have opposite polarities to attract each other.

[0053] Please refer to Figure 1 and Figure 2 Both the fixed latch 7 and the closing latch 6 include a magnet S pole (light-colored magnet) and a magnet N pole (dark-colored magnet).

[0054] Thus, the initial state of the dynamic plant stem monitoring device is a straight state.

[0055] In its straight state, the dynamic plant stem monitoring device is a long strip, which is convenient for storage, transportation, and for being grasped and installed.

[0056] In some embodiments, in the dynamic plant stem monitoring device, the adaptive fixing mechanism is used to control the two support belts 5 to switch between a straight state, an outward opening state, and an inward wrapping state through the state control base 4; In the outward-opening state, the magnets of the closing latches 6 of the two support straps 5 of the adaptive fixing mechanism attract each other, and the first part of the magnets of the fixing latch 7 attract each other, forming a fixing ring in combination with the blocking effect of the outer diameter of the plant stem. The sensing segment of the sensor group is wound around and attached to the plant stem through the fixing ring, switching to the inward-wrapping state; the second part of the magnets of the fixing latch 7 attract each other to adaptively adjust the circumference of the fixing ring.

[0057] In some embodiments, the dynamic plant stem monitoring device can be broken from its initial state by external force and enter an outward opening state, such as by being opened manually.

[0058] Once the dynamic plant stem monitoring device is in place and covers the plant stem, under the guidance of magnetism, the closing latches 6 at the free ends of the two support straps 5 first find and attract each other, completing the initial encirclement of the stem. The obstruction around the stem prevents the support straps 5 from returning to straight, and the support straps 5 will bend along the surface of the stem. Starting from the closing latches 6, extending to the other end of the support straps 5, the corresponding fixed latches 7 magnet pairs will find and attract each other in sequence. This process will proceed automatically until all magnet pairs that can be attracted are locked, thus forming a fixed ring that tightly wraps around the stem. Although the corresponding fixed latches 7 on this fixed ring are not attracted, there is still an attractive force, thus making it fit the plant stem more closely.

[0059] As the plant stem grows thicker, it internally pushes the sensor's original length automatic adjuster 3. The movement of the adjuster simultaneously increases the effective original length of the sensing segment and also pushes the fixing ring outwards. This causes the magnet pairs of some of the originally engaged fixing latches 7 to separate, thus increasing the circumference of the fixing ring. Furthermore, due to the attraction between the corresponding fixing latches 7 on the fixing ring, they remain in contact with the plant stem, automatically matching the size of the grown stem, unlike purely mechanical latches which are tighter before release and looser after release.

[0060] In some embodiments, in the dynamic plant stem monitoring device, the support belt 5 includes a magnet fixing belt 501 and a pull rope 502; The magnet fixing band 501 and the closing latch 6 and fixing latch 7 are fixedly connected to the magnet; The pull rope 502 is connected to the state control base 4. The pull rope 502 is movably inserted through the magnets of the closing lock 6 and the fixing lock 7, so that the pull rope 502 can be adjusted by the state control base 4 to control the two support belts 5 to switch between a straight state, an outward opening state and an inward wrapping state.

[0061] In some embodiments, in the dynamic plant stem monitoring device, the state control base 4 includes a fixing block 401 and a control block 402; The pull rope 502 passes through the control block 402 and the fixing block 401 and is fixedly connected; the end of the magnet fixing strap 501 is fixedly connected to the control block 402; The control block 402 is used to adjust the length of the pull rope 502 between the control block 402 and the closing latch 6.

[0062] In other words, the magnet fixing strap 501 is used to fix several magnets that are equally spaced and repel each other. Each magnet has a through hole through which the pull rope 502 passes. One side is fixed to the attracting magnet, and the other side passes through the corresponding through hole of the control block 402. The end is fixed to the fixing block 401.

[0063] like Figure 1 As shown, the magnet fixing straps 501 are symmetrically arranged, which achieves mutual repulsion between magnet blocks on the same magnet support strap 5. The magnet fixing straps 501 can be controlled to be straight, open outward, or wrap inward by the pull rope 502. Figure 2 (The state shown).

[0064] Since the magnet blocks of the magnet fixing belt 501 are symmetrically arranged, the corresponding magnet blocks of different magnet fixing belts 501 are in an attractive state, so the initial state of the plant stem adaptive dynamic monitoring device is a straight state.

[0065] This forms a set of plant stem adaptive monitoring devices. The device is arranged in an upper and lower position, with a flexible sensor placed in the middle to protect the flexible sensor from interference such as tensile force.

[0066] The fixing block 401 remains stationary, while the control block 402 is pushed toward the snap-lock direction, which changes the mechanical balance between the tension of the fixing band and the magnetic force between the magnets. Under the action of the inherent repulsive force between the magnets on the support band, the tension of the pull rope 502, and the fixing effect of the magnet fixing band 501, the ends of the two support bands are forced to expand outward, forming an outward bending (i.e., outward opening) state, which is similar to a trumpet-shaped structure, making it easier to wrap the plant stem.

[0067] After the outward-opening dynamic plant stem monitoring device clamps the plant stem, the fixing block 401 is released. Driven by the inherent repulsive force between adjacent magnets on the two support belts, and combined with the blocking effect of the outer diameter of the plant stem, they automatically rearrange along the outer diameter circumference of the stem. The sensor original length automatic adjuster 3 is automatically pushed to the position closest to the plant stem according to the size of the outer diameter. The excess magnet blocks will attract each other due to the symmetrical attraction, and the end latches will also be attracted. In this way, the flexible elastic resistor sensor 1 and the flexible non-elastic resistor sensor 2 automatically form a position that fits the plant stem circumference measurement position (original length).

[0068] In this adaptive process, in some embodiments, the fixed block 401 and the control block 402 are magnetic and move closer to each other under the influence of the interaction force between the magnets. The dynamic plant stem monitoring device described in this application automatically adjusts the original length of the flexible sensor group to perform high-precision measurements within an ideal linearity; combining the advantages of two types of sensors, it achieves a method for high-precision measurement of the circumference of plant stems at the daily, weekly, and monthly levels; the installation device enables continuous and rapid installation of the monitoring device; finally, because the monitoring device has multiple magnets, after the plants are harvested, the sensors arranged in the field can be automatically retrieved using a single magnet. With the same inventive concept, this application also provides a dynamic plant stem monitoring system corresponding to the dynamic plant stem monitoring device. Since the principle of the device in this application is similar to that of the dynamic plant stem monitoring device described above in this application, the implementation of the system can refer to the implementation of the device, and the repeated parts will not be described again.

[0069] In this embodiment of the application, a dynamic plant stem monitoring system is also provided, the system including the aforementioned dynamic plant stem monitoring device and monitoring platform; The monitoring platform is used to receive a first sensor signal from the flexible elastic resistor sensor and a second sensor signal from the flexible inelastic resistor sensor, and to determine first data of the plant stem at a first monitoring scale based on the first sensor signal, and to determine second data at a second monitoring scale based on the second sensor signal; the sampling time interval at the first monitoring scale is less than the sampling time interval at the second monitoring scale.

[0070] The monitoring platform can be a cloud server or a local server, responsible for receiving, storing, and analyzing the data transmitted back from the monitoring device.

[0071] The first sensor signal of the flexible elastic resistor sensor is the resistance change data of the flexible elastic resistor sensor; the second sensor signal of the flexible inelastic resistor sensor is the resistance change data of the flexible inelastic resistor sensor.

[0072] The first monitoring scale is a short-term scale, which involves high-frequency sampling, such as once per minute or every few minutes, to capture the slight swelling and shrinkage of the stems of plants during the day (within 24 hours) due to transpiration (water balance).

[0073] The second monitoring scale is a long-term scale, corresponding to low-frequency sampling, such as once per hour or once per day, with the aim of capturing the stem thickening trend of plants over a growing season of several weeks or months.

[0074] The first data is the plant stem circumference or diameter data obtained based on the first sensor signal; the second data is the plant stem circumference or diameter data obtained based on the second sensor signal.

[0075] In some embodiments, the monitoring platform may further process the first data and the second data, perform multi-scale data analysis, and generate analysis results, such as presenting the first data and the second data to the user in the form of charts, reports, or early warning information.

[0076] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and devices described above can be referred to the corresponding processes in the method embodiments, and will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection can be through some communication interfaces; the indirect coupling or communication connection of devices or modules can be electrical, mechanical, or other forms.

[0077] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0078] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0079] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, a platform server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0080] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dynamic plant stem monitoring device, characterized in that, The device includes: a sensor mechanism and an adaptive fixing mechanism; the adaptive fixing mechanism and the sensor mechanism are connected. The sensor mechanism includes a sensor group and an automatic sensor length adjuster; the sensor group includes a flexible elastic resistor sensor and a flexible non-elastic resistor sensor; the flexible elastic resistor sensor and the flexible non-elastic resistor sensor are arranged side by side and both pass through the automatic sensor length adjuster; the sensing segments of the flexible elastic resistor sensor and the flexible non-elastic resistor sensor are used to wrap around and conform to the plant stem; The sensor original length automatic adjuster is used to move under the impetus of the increase in the diameter of the plant stem, so as to synchronously increase the length of the sensing segment of the flexible elastic resistor sensor and the flexible inelastic resistor sensor. The adaptive fixing mechanism is used to adaptively match the sensing segments of the sensor group so that the sensing segments of the sensor group are wound around and attached to the plant stem.

2. The dynamic plant stem monitoring device according to claim 1, characterized in that, The adaptive fixing mechanism includes a state control base and two support belts, with the state control base connected to the fixed ends of the two support belts respectively; the number of sensor groups is two, which are fixed on the two support belts respectively. The free ends of the two support belts are provided with mutually cooperating closing buckles, and the belt bodies of the two support belts are respectively provided with multiple pairs of mutually cooperating fixing buckles. The two support straps form a fixed loop that adaptively matches the sensing segment of the sensor group based on the closing and fixing buckles, so that the sensing segment of the sensor group is wound around and attached to the plant stem through the fixed loop.

3. The dynamic plant stem monitoring device according to claim 2, characterized in that, Both the closing latch and the fixing latch include a pair of magnets that attract each other, and multiple pairs of fixing latches are evenly arranged on the two support strips.

4. The dynamic plant stem monitoring device according to claim 3, characterized in that, The magnet includes two magnetic poles. Adjacent magnetic poles on a single support strip have the same polarity and repel each other, while the magnetic poles of magnets at different positions on different support strips have opposite polarities and attract each other.

5. The dynamic plant stem monitoring device according to claim 4, characterized in that, The adaptive fixing mechanism is used to control the two support belts to switch between a straight state, an outward opening state, and an inward wrapping state via the state control base; In the outward-opening state, the magnets of the closing latches of the two support straps of the adaptive fixing mechanism attract each other, and the first part of the magnets of the fixing latch attract each other, forming a fixing ring in combination with the blocking effect of the outer diameter of the plant stem. The sensor segment of the sensor group is wound around and attached to the plant stem through the fixing ring, switching to the inward-wrapping state; the second part of the magnets of the fixing latch attract each other to adaptively adjust the circumference of the fixing ring.

6. The dynamic plant stem monitoring device according to claim 5, characterized in that, The support belt includes a magnet fixing belt and a pull rope; The magnet fixing band and the closing buckle and fixing buckle are fixedly connected to the magnet; The pull rope is connected to the state control base. The pull rope is movably inserted through the magnets of the closing lock and the fixing lock, so that the pull rope can be adjusted by the state control base to control the two support belts to switch between a straight state, an outward opening state and an inward wrapping state.

7. The dynamic plant stem monitoring device according to claim 6, characterized in that, The state control base includes a fixed block and a control block; The pull cord passes through the control block and is fixedly connected to the fixing block; the end of the magnet fixing strap is fixedly connected to the control block; The control block is used to adjust the length of the pull rope between the control block and the closing latch.

8. The dynamic plant stem monitoring device according to claim 1, characterized in that: The sensor original length automatic adjuster has a first channel and a second channel side by side. The flexible elastic resistor sensor passes through the first channel, and the flexible non-elastic resistor sensor passes through the second channel.

9. The dynamic plant stem monitoring device according to claim 8, characterized in that, The thickness of the flexible elastic resistor sensor is greater than the thickness of the flexible inelastic resistor sensor, and the thickness of the first channel is greater than the thickness of the second channel.

10. A dynamic plant stem monitoring system, characterized in that, The system includes the dynamic plant stem monitoring device and monitoring platform as described in any one of claims 1-9; The monitoring platform is used to receive a first sensor signal from the flexible elastic resistor sensor and a second sensor signal from the flexible inelastic resistor sensor, and to determine first data of the plant stem at a first monitoring scale based on the first sensor signal, and to determine second data at a second monitoring scale based on the second sensor signal; the sampling time interval at the first monitoring scale is less than the sampling time interval at the second monitoring scale.

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