Moisture Sensor

Abstract

The embodiment of the present invention discloses a moisture sensor, which comprises: a shell and a detection sheet arranged in the shell, and an eddy current detection probe located at one end of the shell; wherein the shell comprises an outer shell, an inner shell and a hydrophobic stone, the outer shell is sleeved on the outer side of the inner shell, a detection cavity is formed in the inner shell, the detection sheet is arranged in the detection cavity, the hydrophobic stone is filled between the outer shell and the inner shell, and a plurality of guide holes are opened on the outer shell and the inner shell. The moisture sensor is easy to use, has a wide range of applications and high measurement accuracy.

Description

Technical Field

[0001] The invention relates to the field of sensors, and in particular to a moisture sensor. Background Art

[0002] At present, soil moisture sensors mainly use two measurement principles, TDR and FDR. Both of these soil moisture sensors require the detection probe to be in direct contact with the soil during use. The type and density of the soil have a great impact on the accuracy of the data measured by the sensor. The sensor is calibrated in batches when it leaves the factory. If higher accuracy is required, the actual measured soil needs to be brought back to the laboratory and recalibrated using the drying method. The measurement personnel then convert it into soil moisture content according to the calibration formula. It is inconvenient to use and has a single scope of application.

[0003] Therefore, it is necessary to develop a moisture sensor that is easy to use, has a wide range of applications and high measurement accuracy.

[0004] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a moisture sensor which is easy to use, has a wide range of applications and has high measurement accuracy.

[0006] In order to achieve the above object, a moisture sensor is provided according to the present invention, the moisture sensor comprising: a housing and a detection sheet arranged in the housing, an eddy current detection probe located at one end of the housing;

[0007] Among them, the shell includes an outer shell, an inner shell and a hydrophobic stone. The outer shell is sleeved on the outside of the inner shell. A detection cavity is formed in the inner shell. The detection piece is arranged in the detection cavity. The hydrophobic stone is filled between the outer shell and the inner shell. A plurality of guide holes are opened on the outer shell and the inner shell.

[0008] Preferably, the detection sheet is a metal sheet.

[0009] Preferably, one end of the eddy current detection probe passes through the shell and is arranged in the detection cavity, and the arrangement direction of the eddy current detection probe is perpendicular to the metal sheet.

[0010] Preferably, the area ratio of the cross section of the metal sheet to that of the eddy current detection probe is greater than or equal to 3.

[0011] Preferably, it also includes an output wire, which is connected to the end of the eddy current detection probe that does not extend into the detection cavity.

[0012] Preferably, the outer shell and the inner shell are in the shape of a cuboid.

[0013] Beneficial effect: The moisture sensor of the present application can measure soil moisture content by non-contact measurement through the setting of eddy current detection probe and detection sheet, using the eddy current measurement principle. Since it is non-contact with the soil, the soil type and density have no effect on the measurement accuracy. The measurement personnel can directly use it to obtain the soil moisture content. The moisture sensor of the present application has a wide range of applications, which not only improves the measurement accuracy of the sensor, but also reduces the workload of the measurement personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the structure of the moisture sensor of the present invention.

[0015] Description of reference numerals:

[0016] 1 Shell; 2 Hydrophobic stone; 3 Eddy current detection probe; 4 Metal sheet; 5 Water; 6 Output wire. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is described in detail below with reference to the accompanying drawings.

[0018] According to one aspect of the present invention, a moisture sensor is provided, which comprises: a housing and a detection sheet arranged in the housing, an eddy current detection probe located at one end of the housing;

[0019] Among them, the shell includes an outer shell, an inner shell and a hydrophobic stone. The outer shell is sleeved on the outside of the inner shell. A detection cavity is formed in the inner shell. The detection piece is arranged in the detection cavity. The hydrophobic stone is filled between the outer shell and the inner shell. A plurality of guide holes are opened on the outer shell and the inner shell.

[0020] The moisture sensor provided by the present invention, during use, is buried in the soil to be detected, so that the eddy current detection probe is located above the moisture sensor, the moisture in the soil to be detected enters the detection cavity through the shell, and when the moisture in the detection cavity and the moisture in the soil reach equilibrium, the moisture in the soil will stop penetrating into the shell, and the moisture that penetrates into the shell is deposited below the detection sheet, the measurement value of the eddy current detection probe is related to the distance value between the eddy current detection probe and the detection sheet, the detection sheet is lifted by the water collected in the detection cavity, and the distance output between the detection sheet and the eddy current detection probe changes, and the moisture content in the soil can be known by the signal obtained by the eddy current detection probe. The moisture sensor detection component does not need to directly contact the object to be detected, and the type and density of the object to be detected have no effect on the measurement accuracy. The measurement personnel can directly use it to obtain the moisture content of the soil. The moisture sensor of the present application has a wide range of applications, which not only improves the measurement accuracy of the sensor, but also reduces the workload of the measurement personnel.

[0021] Specifically, after completing the soil moisture detection, the moisture sensor can be taken out, and the moisture in the moisture sensor will be conducted to the outside of the shell through the shell, and the moisture content in the moisture sensor will be balanced with the external environment.

[0022] Furthermore, the detection sheet is a metal sheet.

[0023] Specifically, a change in the distance between the metal sheet and the eddy current detection probe will cause a change in the measurement result of the eddy current detection probe. The moisture content of the object to be detected can be known based on the distance measurement result of the eddy current detection probe, which is easy to use.

[0024] Furthermore, one end of the eddy current detection probe passes through the shell and is arranged in the detection cavity, and the setting direction of the eddy current detection probe is perpendicular to the metal sheet.

[0025] Specifically, one end of the eddy current detection probe passes through the shell and is arranged in the detection cavity, which is convenient for the installation and disassembly of the eddy current detection probe. The setting direction of the eddy current detection probe is perpendicular to the metal sheet. When moisture enters the detection cavity to lift the metal sheet, the distance between the metal sheet and the eddy current detection probe can be directly changed, so that the detection result of the moisture sensor is more accurate.

[0026] Furthermore, the area ratio of the cross section of the metal sheet to that of the eddy current detection probe is greater than or equal to 3.

[0027] Specifically, by making the area of ​​the metal sheet larger than the cross-section of the eddy current detection probe and the area of ​​the metal sheet more than three times the cross-section of the eddy current detection probe, it is ensured that the eddy current detection probe can accurately detect the change in the distance between the metal sheet and the eddy current detection probe.

[0028] Furthermore, it also includes an output wire, which is connected to an end of the eddy current detection probe that does not extend into the detection cavity.

[0029] Specifically, the setting of the output wire facilitates the output of the measurement result of the eddy current detection probe.

[0030] Furthermore, the outer shell and the inner shell are in a rectangular shape.

[0031] Specifically, a rectangular parallelepiped design is adopted to facilitate the production and processing of the shell.

[0032] Example 1

[0033] Figure 1 Schematic diagram of the structure of the moisture sensor of the present invention.

[0034] like Figure 1As shown, the moisture sensor includes a housing 1 , a hydrophobic stone 2 , an eddy current detection probe 3 , a metal sheet 4 and an output wire 6 .

[0035] When in use, the moisture sensor is vertically buried in the soil to be measured. The soil moisture flows into the shell 1 through the hydrophobic stone 2 to form water 5. The metal sheet 4 is suspended on the water 5. When the height of the water 5 changes, the height of the metal sheet 4 also changes. The eddy current detection probe 3 and the metal sheet 4 are in a vertical state. After the eddy current detection probe 3 is energized, it generates eddy current with the metal sheet 4. The current intensity is related to the distance, and the signal is output through the output wire 6.

[0036] Furthermore, the area of ​​the metal sheet 4 is greater than three times the detection surface of the vertical eddy current detection probe 3 .

[0037] Furthermore, if the soil moisture outside the moisture sensor decreases, the water 5 inside the sensor is automatically discharged through the hydrophobic stone 2, and the water content of the water 5 is balanced with the soil moisture content. By measuring the height of the variable gap, the soil moisture content can be converted.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A moisture sensor, characterized in that: The moisture sensor comprises: a shell, a detection sheet arranged in the shell, and an eddy current detection probe located at one end of the shell; The shell comprises an outer shell, an inner shell and a hydrophobic stone, the outer shell is sleeved on the outer side of the inner shell, a detection cavity is formed in the inner shell, the detection sheet is arranged in the detection cavity, the hydrophobic stone is filled between the outer shell and the inner shell, and a plurality of guide holes are opened on the outer shell and the inner shell; The detection sheet is a metal sheet; The outer shell and the inner shell are in a rectangular shape.

2. The moisture sensor according to claim 1, characterized in that: One end of the eddy current detection probe passes through the shell and is arranged in the detection cavity. The arrangement direction of the eddy current detection probe is perpendicular to the metal sheet.

3. The moisture sensor according to claim 2, characterized in that: The area ratio of the cross section of the metal sheet to the cross section of the eddy current detection probe is greater than or equal to 3.

4. The moisture sensor according to claim 2, characterized in that: It also includes an output wire, which is connected to the end of the eddy current detection probe that does not extend into the detection cavity.

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