Device and method for measuring sensitive area of ​​multi-section tubular moisture sensor

Abstract

The present invention relates to the field of water content detection technology, and discloses a device and method for measuring the sensitive area of ​​a multi-section tubular water content sensor. The device for measuring the sensitive area of ​​a multi-section tubular water content sensor comprises: a measuring barrel, a lifting mechanism and a data collector; the interior of the measuring barrel is divided into a first space for placing the soil to be tested, a second space for placing a material with a fixed dielectric constant, and a third space for the soil water content sensor to move up and down; the first space is located in the second space, and the third space is located in the first space; the lifting mechanism is used to drive the soil water content sensor to move up and down, and the data collector is connected to the soil water content sensor signal. The device for measuring the sensitive area of ​​a multi-section tubular water content sensor directly observes the sensitive area of ​​the section tubular soil water content sensor through an experimental method, realizes the automatic and intelligent detection of the soil water content sensor, improves the detection work efficiency, and ensures the sensor is tested in a real soil sample environment.

Description

Technical Field

[0001] The invention relates to the technical field of moisture detection, and in particular to a device and method for measuring a sensitive area of ​​a multi-section tubular moisture sensor. Background Art

[0002] Soil moisture content is an important indicator in soil. It is a basic factor that affects water circulation, nutrient migration and crop growth. At present, sensors for measuring soil moisture content can be divided into single-point and multi-profile sensors according to the number of measurement objects. The single-point measurement space is limited to the order of cubic decimeters, so in order to obtain the moisture distribution of the soil profile, multiple sensors need to be buried during the detection process, which not only increases the installation complexity and construction cost, but also destroys the original structure of the soil. For this reason, multi-profile soil moisture sensors can measure the humidity of multiple points in the vertical direction of the soil layer at one time, and the use of a tubular structure minimizes the damage to the soil structure, and its application range is becoming more and more extensive.

[0003] Accurately measuring the sensitive domain of soil moisture sensors is of great significance for optimizing soil moisture monitoring points, reducing invalid sampling points and sampling costs, and improving the accuracy of field information collection. However, the actual range of action of multi-profile soil moisture sensors in specific soils is still unclear in the prior art, and there is a lack of effective experimental detection devices and methods. Summary of the invention

[0004] The embodiment of the present invention provides a device and method for measuring the sensitive area of ​​a multi-section tubular moisture sensor, which is used to solve or partially solve the problem that the existing measurement method cannot accurately measure the sensitive area of ​​the soil moisture sensor.

[0005] In a first aspect, an embodiment of the present invention provides a device for measuring a sensitive area of ​​a multi-section tubular moisture sensor, comprising: a measuring barrel, a lifting mechanism, and a data collector;

[0006] The interior of the measuring barrel is divided into a first space for placing the soil to be tested, a second space for placing the material with a fixed dielectric constant, and a third space for the soil moisture sensor to move up and down; the first space is located in the second space, and the third space is located in the first space;

[0007] The lifting mechanism is used to drive the soil moisture sensor to reciprocate up and down, and the data collector is connected to the soil moisture sensor signal.

[0008] On the basis of the above technical solution, partitions made of PVC material are installed between the first space and the second space and between the first space and the third space.

[0009] Based on the above technical solution, the thickness of the partition is less than or equal to 3 mm.

[0010] On the basis of the above technical solution, the lifting mechanism includes a pulley, a stepper motor and a rope; the rope is wound around the pulley; one end of the rope is connected to the soil moisture sensor, and the other end is connected to the power output end of the stepper motor.

[0011] On the basis of the above technical solution, the shape of the first space is a cylinder that is larger at the top and smaller at the bottom, and one end of the first space is open.

[0012] Based on the above technical solution, the shapes of the measuring barrel and the third space are both cylindrical.

[0013] In a second aspect, an embodiment of the present invention provides a method for measuring the sensitive area of ​​a multi-section tubular moisture sensor of a measuring device for the sensitive area of ​​a multi-section tubular moisture sensor provided by the above-mentioned technical solutions, comprising:

[0014] S1, fill the first space with the soil to be tested, and fill the second space with the fluid material with a fixed dielectric constant;

[0015] S2, the soil moisture sensor moves in the vertical direction in the third space, and each movement interval of the soil moisture sensor is a fixed interval;

[0016] S3, when |AV i -AV i-1 |>V1, obtain the current vertical position h1 of the soil moisture sensor, calculate the horizontal distance d1 between the soil moisture sensor and the second space, when |AV i -AV i-1 |<V2, obtain the current vertical position h2 of the soil moisture sensor, and calculate the horizontal distance d2 between the soil moisture sensor and the second space;

[0017] Then the sensitive area of ​​the soil moisture sensor is d2~d1;

[0018] Among them, the sliding average is taken for every N collection points, AV i Refers to taking the i-th sliding average; AV i-1 It refers to the i-1th sliding average; V1 refers to the difference between the i-th and the previous sliding average when the soil moisture sensor moves from top to bottom, that is, the starting point of the sharp change of the collected signal; V2 refers to the difference between the i-th and the previous sliding average, that is, the end point of the sharp change of the collected signal.

[0019] On the basis of the above technical solutions, it also includes:

[0020] S4, adding water into the first space, and repeating steps S2 and S3 in sequence to obtain the domain relationship function of the soil moisture sensor at different water contents.

[0021] Based on the above technical solution, the fixed spacing is 1 mm, 5 mm or 10 mm.

[0022] The embodiment of the present invention provides a device and method for measuring the sensitive area of ​​a multi-section tubular moisture sensor. The device and method use a soil drill to obtain the original soil to be tested, fill the soil to be tested in the first space, and fill the second space with a fixed dielectric constant fluid material. The dielectric constant characteristic of the fixed dielectric constant material is that it is significantly different from the soil dielectric constant of dry soil and maximum water content, that is, it is significantly different from the soil dielectric constant of dry soil and wet soil. First, the position of the probe of the soil moisture sensor to be tested corresponds to the horizontal 0 scale, and the soil moisture sensor moves in the third space in the vertical direction, that is, the probe of the soil moisture sensor to be tested moves from the top of the third space to the bottom of the third space. Each movement interval of the soil moisture sensor is a fixed spacing, and the fixed spacing can be 1mm, 5mm or 10mm. The data collector can obtain a signal output curve based on the signal sent by the soil moisture sensor at each position. When |AV i -AV i-1 |>V1, the vertical position h1 of the current soil moisture sensor is obtained, and the horizontal distance d1 between the soil moisture sensor and the second space is calculated; that is, the horizontal distance d1 between the soil moisture sensor and the second space at this time is obtained from the vertical position h1 and the proportional relationship between the first space, the second space and the third space. The horizontal distance d1 is the horizontal distance from the soil moisture sensor to the junction of the first space and the second space; the soil moisture sensor continues to move downward; when |AV i -AV i-1 |<V2, obtain the vertical position h2 of the current soil moisture sensor, and calculate the horizontal distance d2 between the soil moisture sensor and the second space; that is, the horizontal distance d2 between the soil moisture sensor and the second space at this time is obtained by the vertical position h2 and the proportional relationship between the first space, the second space and the third space. The horizontal distance d2 is the horizontal distance from the soil moisture sensor to the junction of the first space and the second space; then the sensitive area of ​​the soil moisture sensor is d2~d1; among them, the sliding average is taken for every N acquisition points, AV i Refers to taking the i-th sliding average; AV i-1Refers to taking the i-1th sliding average; V1 refers to the difference between the i-th and last sliding averages when the soil moisture sensor moves from top to bottom, that is, the starting point of the sharp change of the collected signal; V2 refers to the difference between the i-th and last sliding averages, that is, the end point of the sharp change of the collected signal, from which the change begins to slowly approach a straight line; V1 and V2 are empirical values, they are inflection points, and can be selected according to actual conditions. The measuring device of the sensitive area of ​​the multi-section tubular moisture sensor provided by the embodiment of the present invention comprehensively utilizes the difference in dielectric constants between the standard and the dry and wet soil, and directly observes the sensitive area of ​​the multi-section tubular soil moisture sensor through experiments, thereby realizing the automatic and intelligent detection of the soil moisture sensor, improving the detection efficiency, and ensuring the sensor is tested in a real soil sample environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic structural diagram of a device for measuring the sensitive area of ​​a multi-section tubular moisture sensor according to an embodiment of the present invention;

[0025] Figure 2 Graph showing output signals of a sensitive area of ​​a multi-section tubular moisture sensor according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] 1. Stepper motor; 2. Pulley; 3. Measuring barrel; 4. Data collector; 5. First space; 6. Second space; 7. Third space; 8. Opening. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In terms of the sensitive field of soil moisture sensors, Zhao Yandong qualitatively explained that the effective measurement soil of the SWR soil moisture sensor is: a conical soil body with the middle probe as the center, a radius less than the distance between the inner and outer probes, and a depth equal to the length of the middle probe. Yan Hua and Gao Zhitao simulated the electric field distribution of the soil profile moisture sensor probe in the soil through maxwell and HFSS software respectively, and obtained the detection range around the probe. In fact, the effective action range of the soil moisture sensor in the soil to be tested is affected by many factors, such as measurement frequency, temperature, soil conductivity, sensor structure, etc. The software simulation method has a large error between the measurement detection range result and the actual situation. The dielectric model of the soil is often difficult to be the same. A single model has great limitations in guiding the action range of other types of soil moisture. Sun Yurui proposed a method to determine the spatial sensitivity of the dielectric soil moisture sensor based on the radial melting process of the frozen soil sample from the inside of the cylindrical side wall from the outside to the inside, but the experimental process is relatively complicated and cumbersome.

[0031] To this end, an embodiment of the present invention provides a device for measuring the sensitive area of ​​a multi-section tubular moisture sensor, such as Figure 1 As shown, the measuring device of the sensitive area of ​​the multi-section tubular moisture sensor according to the embodiment of the present invention comprises: a measuring barrel 3, a lifting mechanism and a data collector 4;

[0032] The interior of the measuring barrel 3 is divided into a first space 5 for placing the soil to be tested, a second space 6 for placing a material with a fixed dielectric constant, and a third space 7 for the soil moisture sensor to move up and down; the first space 5 is located in the second space 6, and the third space 7 is located in the first space 5; that is, the second space 6 and the third space 7 are both in contact with the first space 5, and there is no contact between the second space 6 and the third space 7;

[0033] The lifting mechanism is used to drive the soil moisture sensor to reciprocate up and down, and the data collector 4 is connected to the soil moisture sensor signal.

[0034] It should be noted that the shapes of the measuring barrel 3 and the third space 7 are both cylindrical. The interior of the measuring barrel 3 is divided into three areas, namely the first space 5, the second space 6 and the third space 7. The outer wall of the second space 6 is in contact with the inner wall of the measuring barrel 3, and the outer wall of the first space 5 is in contact with the inner wall of the second space 6. The shape of the first space 5 is a cylinder with a large top and a small bottom. The top of the first space 5 is open. A chamber is provided inside the first space 5. The third space 7 is located in the chamber, and the outer wall of the third space 7 is in contact with the inner wall of the first space 5.

[0035] In the embodiment of the present invention, a soil drill is used to obtain the original soil to be tested, the soil to be tested is filled in the first space 5, and the fixed dielectric constant fluid material is filled in the second space 6; wherein, the dielectric constant characteristic of the fixed dielectric constant material is that it is significantly different from the soil dielectric constant of dry soil and maximum water content, that is, it is significantly different from the soil dielectric constant of dry soil and wet soil; first, the position of the probe of the soil moisture sensor to be tested corresponds to the horizontal 0 scale, and the soil moisture sensor moves in the third space 7 along the vertical direction, that is, the probe of the soil moisture sensor to be tested moves from the top of the third space 7 to the bottom of the third space 7, and each movement interval of the soil moisture sensor is a fixed spacing, and the fixed spacing can be 1mm, 5mm or 10mm; the data collector 4 can obtain a signal output curve according to the signal sent by the soil moisture sensor at each position; when |AV i -AV i-1 |>V1, the vertical position h1 of the current soil moisture sensor is obtained, and the horizontal distance d1 between the soil moisture sensor and the second space is calculated; that is, the horizontal distance d1 between the soil moisture sensor and the second space 6 at this time is obtained from the vertical position h1 and the proportional relationship between the shapes of the first space 5, the second space 6 and the third space 7. The horizontal distance d1 is the horizontal distance from the soil moisture sensor to the junction of the first space 5 and the second space 6; the soil moisture sensor continues to move downward; when |AV i -AV i-1 |<V2, obtain the vertical position h2 of the current soil moisture sensor, and calculate the horizontal distance d2 between the soil moisture sensor and the second space; that is, the horizontal distance d2 between the soil moisture sensor and the second space 6 at this time is obtained from the vertical position h2 and the proportional relationship between the first space 5, the second space 6 and the third space 7. The horizontal distance d2 is the horizontal distance from the soil moisture sensor to the junction of the first space 5 and the second space 6; then the sensitive area of ​​the soil moisture sensor is d2~d1; wherein, the sliding average value is taken for every N acquisition points, AV i Refers to taking the i-th sliding average; AV i-1Refers to taking the i-1th sliding average; V1 refers to the difference between the i-th and last sliding averages when the soil moisture sensor moves from top to bottom, that is, the starting point of the sharp change of the collected signal; V2 refers to the difference between the i-th and last sliding averages, that is, the end point of the sharp change of the collected signal, from which the change begins to slowly approach a straight line; V1 and V2 are empirical values, they are inflection points, and can be selected according to actual conditions. The measuring device of the sensitive area of ​​the multi-section tubular moisture sensor provided by the embodiment of the present invention comprehensively utilizes the difference in dielectric constants between the standard and the dry and wet soil, and directly observes the sensitive area of ​​the multi-section tubular soil moisture sensor through experiments, thereby realizing the automatic and intelligent detection of the soil moisture sensor, improving the detection efficiency, and ensuring the sensor is tested in a real soil sample environment.

[0036] On the basis of the above embodiment, partitions made of PVC material are installed between the first space 5 and the second space 6 and between the first space 5 and the third space 7 .

[0037] It should be noted that the thickness of the partition is less than or equal to 3 mm. The inner diameter of the third space is matched with the outer diameter of the soil moisture sensor so that the two are closely combined.

[0038] On the basis of the above embodiment, the lifting mechanism includes a pulley 2, a stepper motor 1 and a rope; the rope is wound around the pulley 2; one end of the rope is connected to the soil moisture sensor, and the other end is connected to the power output end of the stepper motor 1.

[0039] It should be noted that the data collector 4 controls the action of the stepping motor 1 on the one hand, and collects the output signal of the multi-section tubular soil moisture sensor to be tested on the other hand.

[0040] Based on the above embodiments, the method for measuring the sensitive area of ​​a multi-section tubular moisture sensor provided by the embodiment of the present invention includes:

[0041] S1, fill the first space with the soil to be tested, and fill the second space with the fluid material with a fixed dielectric constant;

[0042] The second space is provided with an opening 8, and a fluid substance with a fixed dielectric constant is placed in the second space through the opening 8;

[0043] S2, the soil moisture sensor moves in the vertical direction in the third space, and each movement interval of the soil moisture sensor is a fixed interval;

[0044] S3, when |AV i -AV i-1 |>V1, obtain the vertical position h1 of the current soil moisture sensor, calculate the horizontal distance d1 between the soil moisture sensor and the second space, and when |AV i-AV i-1 |<V2, obtain the vertical position h2 of the current soil moisture sensor, and calculate the horizontal distance d2 between the soil moisture sensor and the second space;

[0045] Then the sensitive area of ​​the soil moisture sensor is d2~d1;

[0046] Among them, the sliding average is taken for every N collection points, AV i Refers to taking the i-th sliding average; AV i-1 It refers to taking the i-1th sliding average; V1 refers to the difference between the i-th and the previous sliding average when the soil moisture sensor moves from top to bottom, that is, the starting point of the sharp change of the collected signal; V2 refers to the difference between the i-th and the previous sliding average, that is, the end point of the sharp change of the collected signal, from this point on, the change begins to slowly approach a straight line; V1 and V2 are empirical values, they are inflection points, and can be selected according to actual conditions.

[0047] In the embodiment of the present invention, a soil drill is used to obtain the original soil to be tested, the soil to be tested is filled in the first space 5, and the fixed dielectric constant fluid material is filled in the second space 6; wherein, the dielectric constant characteristic of the fixed dielectric constant material is that it is significantly different from the soil dielectric constant of dry soil and maximum water content, that is, it is significantly different from the soil dielectric constant of dry soil and wet soil; first, the position of the probe of the soil moisture sensor to be tested corresponds to the horizontal 0 scale, and the soil moisture sensor moves in the third space 7 along the vertical direction, that is, the probe of the soil moisture sensor to be tested moves from the top of the third space 7 to the bottom of the third space 7, and each movement interval of the soil moisture sensor is a fixed spacing, and the fixed spacing can be 1mm, 5mm or 10mm; the data collector 4 can obtain a signal output curve according to the signal sent by the soil moisture sensor at each position; when |AV i -AV i-1 |>V1, the vertical position h1 of the current soil moisture sensor is obtained, and the horizontal distance d1 between the soil moisture sensor and the second space is calculated; that is, the horizontal distance d1 between the soil moisture sensor and the second space 6 at this time is obtained from the vertical position h1 and the proportional relationship between the shapes of the first space 5, the second space 6 and the third space 7. The horizontal distance d1 is the horizontal distance from the soil moisture sensor to the junction of the first space 5 and the second space 6; the soil moisture sensor continues to move downward; when |AV i -AV i-1|<V2, obtain the vertical position h2 of the current soil moisture sensor, and calculate the horizontal distance d2 between the soil moisture sensor and the second space; that is, the horizontal distance d2 between the soil moisture sensor and the second space 6 at this time is obtained from the vertical position h2 and the proportional relationship between the first space 5, the second space 6 and the third space 7. The horizontal distance d2 is the horizontal distance from the soil moisture sensor to the junction of the first space 5 and the second space 6; then the sensitive area of ​​the soil moisture sensor is d2~d1; wherein, the sliding average value is taken for every N acquisition points, AV i Refers to taking the i-th sliding average; AV i-1 Refers to taking the i-1th sliding average; V1 refers to the difference between the i-th and last sliding averages when the soil moisture sensor moves from top to bottom, that is, the starting point of the sharp change of the collected signal; V2 refers to the difference between the i-th and last sliding averages, that is, the end point of the sharp change of the collected signal, from which the change begins to slowly approach a straight line; V1 and V2 are empirical values, they are inflection points, and can be selected according to actual conditions. The method for measuring the sensitive area of ​​the multi-section tubular moisture sensor provided in the embodiment of the present invention comprehensively utilizes the difference in dielectric constants between the standard and the dry and wet soil, and directly observes the sensitive area of ​​the multi-section tubular soil moisture sensor through experiments, thereby realizing the automated and intelligent detection of the soil moisture sensor, improving the detection efficiency, and ensuring that the sensor is tested in a real soil sample environment.

[0048] Based on the above embodiment, it also includes:

[0049] S4, adding water into the first space, and repeating steps S2 and S3 in sequence to obtain the domain relationship function of the soil moisture sensor under different water contents.

[0050] It should be noted that a water injection port may be provided on the first space, and water is added into the first space through the water injection port.

[0051] In an embodiment of the present invention, the soil to be tested is first filled into the first space, and the sensitive area of ​​the soil moisture sensor is measured and obtained; then water is added into the first space in sequence, and after settling for a certain period of time, the domain relationship function of the soil moisture sensor at different water contents is obtained.

[0052] The following is an example of the soil moisture sensor moving from top to bottom. Figure 2 As shown in the figure, the soil moisture sensor is initially placed on the same level as the measuring bucket. Figure 2 At point a, as the soil moisture sensor gradually descends, the output signal slowly increases. This is because after the soil to be tested is collected and settled for a period of time, the soil moisture at the bottom is relatively high. The data collector obtains the sliding average of the output signal values ​​corresponding to each of the N collection points. In this embodiment, N is 4. When |AVi -AV i-1 |>V1 Figure 2 At point b, in this example, V1 is 0.5. At this time, the vertical position h1 of the current soil moisture sensor can be obtained, and the horizontal distance between the soil moisture sensor and the second space is d1 according to the fixed proportional relationship of the device shape. Continue to move downward. When |AV i -AV i-1 |<V2 Figure 2 At point c, in this embodiment, V2 is taken as 0.2. At this time, the current vertical position h2 of the soil moisture sensor can be obtained, and from the proportional relationship of the device shape, it can be obtained that the horizontal distance between the soil moisture sensor and the second space is d2. Then, the sensitive area of ​​the soil moisture sensor in the type of soil with this moisture content is d2~d1.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for measuring the sensitive area of ​​a multi-section tubular moisture sensor applied to a device for measuring the sensitive area of ​​a multi-section tubular moisture sensor, characterized in that: The measuring device of the sensitive area of ​​the multi-section tubular moisture sensor includes: a measuring barrel, a lifting mechanism and a data collector; The interior of the measuring barrel is divided into a first space for placing the soil to be tested, a second space for placing the material with a fixed dielectric constant, and a third space for the soil moisture sensor to move up and down; the first space is located in the second space, and the third space is located in the first space; The lifting mechanism is used to drive the soil moisture sensor to reciprocate up and down, and the data collector is connected to the soil moisture sensor signal; The measurement method of the sensitive area of ​​the multi-section tube moisture sensor includes: S1, fill the first space with the soil to be tested, and fill the second space with the fluid material with a fixed dielectric constant; S2, the soil moisture sensor moves in the vertical direction in the third space, and each movement interval of the soil moisture sensor is a fixed interval; S3, when |AV i -AV i-1 |>V1, obtain the current vertical position h1 of the soil moisture sensor, calculate the horizontal distance d1 between the soil moisture sensor and the second space, when |AV i -AV i-1 |<V2, obtain the current vertical position h2 of the soil moisture sensor, and calculate the horizontal distance d2 between the soil moisture sensor and the second space; Then the sensitive area of ​​the soil moisture sensor is d2~d1; Among them, the sliding average is taken for every N collection points, AV i Refers to taking the i-th sliding average; AV i-1 Refers to taking the i-1th sliding average; V1 refers to the difference between the i-th and the previous sliding average when the soil moisture sensor moves from top to bottom, that is, the starting point of the sharp change of the collected signal; V2 refers to the difference between the i-th and the previous sliding average, that is, the end point of the sharp change of the collected signal; S4, adding water into the first space, and repeating steps S2 and S3 in sequence to obtain the domain relationship function of the soil moisture sensor at different water contents.

2. The method for measuring the sensitive area of ​​a multi-section tubular moisture sensor according to claim 1, characterized in that: The fixed spacing is 1 mm, 5 mm or 10 mm.

3. The method for measuring the sensitive area of ​​a multi-section tubular moisture sensor according to claim 1, characterized in that: A partition made of PVC material is installed between the first space and the second space, and between the first space and the third space.

4. The method for measuring the sensitive area of ​​a multi-section tubular moisture sensor according to claim 3, characterized in that: The thickness of the partition is less than or equal to 3 mm.

5. The method for measuring the sensitive area of ​​a multi-section tubular moisture sensor according to claim 1, characterized in that: The lifting mechanism comprises a pulley, a stepping motor and a rope; the rope is wound around the pulley; one end of the rope is connected to the soil moisture sensor, and the other end of the rope is connected to the power output end of the stepping motor.

6. The method for measuring the sensitive area of ​​a multi-section tubular moisture sensor according to claim 1, characterized in that: The first space is in the shape of a cylinder that is larger at the top and smaller at the bottom, and one end of the first space is open.

7. The method for measuring the sensitive area of ​​a multi-section tubular moisture sensor according to claim 6, characterized in that: The measuring barrel and the third space are both cylindrical in shape.

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