A modular tension sensor device for measuring multi-layer soil

Abstract

The present invention relates to a modular tension sensor device for measuring multi-layer soil, characterized in that the modular tension sensor device comprises: a fluid cavity, a multi-media measurement cavity module, a pressure sensor, a first fluid pipeline, a gas pipeline, a normally closed gas outlet valve, a normally closed liquid inlet valve, a connecting valve, a second fluid pipeline, a drive control unit, a data processing unit, a data storage unit, a data sending unit and a data receiving unit. The present invention provides a modular tension sensor device for measuring multi-layer soil, which solves the technical problems of cumbersome operation and complex configuration of a device for measuring multi-layer soil, realizes the measurement of multi-layer soil tension values ​​with a pressure sensor, shares a set of liquid replenishment and self-calibration external equipment, and greatly reduces the cost required for measuring multi-layer soil tension.

Description

Technical Field

[0001] The invention relates to the technical field of online soil moisture measurement, and in particular to a modular tension sensor device for measuring multi-layer soil. Background Art

[0002] Plant growth requires an optimal environment of water, fertilizer, air, and heat, with water being the most important regulatory factor. Water is one of the important raw materials for plant photosynthesis, and it also affects the opening and closing of plant leaf stomata, indirectly affecting the absorption of carbon dioxide. Water shortage will reduce the photosynthetic rate. Knowing the appropriate soil moisture conditions can achieve the effects of saving water and fertilizer and increasing production. Therefore, real-time and accurate monitoring of soil moisture has important guiding significance for agricultural production.

[0003] Soil moisture has the following functions in the growth process of plants:

[0004] 1. Soil moisture conditions directly affect crop nutrient absorption;

[0005] 2. The decomposition and mineralization of organic nutrients in the soil cannot be separated from water;

[0006] 3. Chemical fertilizers applied to the soil can only dissolve in water;

[0007] 4. The absorption of nutrients by crop roots must be achieved through water media.

[0008] Insufficient or excessive soil moisture will affect the normal growth of plants. The main manifestations are: Insufficient soil moisture will directly (reduced photosynthesis raw materials) or indirectly (stomatal closure, enzyme inactivation, etc.) affect photosynthesis, becoming the biggest limiting factor for photosynthesis. Lack of water can also cause the death of crops, because the total volume of soil gaps is certain, and this part of the volume is occupied by water and air. Then when there is too little water, the plant roots absorb insufficient water, and the transpiration of the plant causes the plant to lose a lot of water, which causes the plant to lose water and wither. When the soil lacks water, it will cause soil compaction and cracks. The resulting tension can break the plant roots, and in severe cases, it will cause plant death. When there is too much water, the proportion of air is small, resulting in the weakening of aerobic respiration of plant roots. The plant roots are forced to turn to anaerobic respiration. Anaerobic respiration produces alcohol that poisons the plant roots, causing root rot, and in severe cases, it also causes plant death.

[0009] Soil moisture measurement generally requires measuring multiple layers of data (such as 15, 30, 45, 60 cm underground, etc.) to comprehensively judge the moisture status of the soil.

[0010] Currently, the tension measurement method is mostly used to measure the moisture status of multiple layers of soil. Multiple tension sensor devices are set in different soil layers. After obtaining the moisture values ​​of multiple soil layers, the moisture status of the soil is comprehensively judged. The layout setting of multiple tension sensors also directly leads to an increase in the cost of soil moisture measurement.

[0011] Therefore, it is hoped that a modular tension sensor device for measuring multi-layer soil can solve the problems existing in the prior art. Summary of the invention

[0012] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a modular tension sensor device for measuring multi-layer soil, which solves the technical problems of cumbersome operation and complex configuration of the device for measuring multi-layer soil, and realizes the measurement of the tension value of multi-layer soil by using a pressure sensor. In addition, the modular tension sensor device shares a set of liquid replenishment and self-calibration external equipment, which greatly reduces the cost required for measuring multi-layer soil.

[0013] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0014] The present invention provides a modular tension sensor device for measuring multi-layer soil, characterized in that the modular tension sensor device comprises: a fluid cavity, a multi-media measurement cavity module, a pressure sensor, a first fluid pipeline, a gas pipeline, a normally closed gas outlet valve, a normally closed liquid inlet valve, a connecting valve, a second fluid pipeline, a drive control unit, a data processing unit, a data storage unit, a data sending unit and a data receiving unit;

[0015] A first fluid pipeline and a gas pipeline are respectively arranged on the top of the fluid cavity, wherein one end of the first fluid pipeline is connected to the fluid cavity through a normally closed liquid inlet valve, and the other end of the first fluid pipeline is connected to a liquid replenishing tank to replenish the liquid in the fluid cavity; one end of the gas pipeline is connected to the fluid cavity through a normally closed gas outlet valve, and the other end of the gas pipeline is connected to a vacuum pump to extract the gas in the fluid cavity;

[0016] A pressure sensor is arranged at the bottom of the fluid chamber, the pressure sensor is connected to a data processing unit through a circuit, and the data processing unit is electrically connected to a data storage unit;

[0017] The pressure sensor sends the tension value to the data processing unit, and the data processing unit stores the tension value in the data storage unit;

[0018] A plurality of normally closed connecting valves are also arranged at the bottom of the fluid cavity, and each connecting valve is connected to the multi-media measuring cavity module of the tension sensor through a second fluid pipeline;

[0019] The normally closed air outlet valve, the normally closed liquid inlet valve and the connecting valve are connected to the data processing unit through the driving control unit respectively, and the data processing unit sends opening and closing commands to the normally closed air outlet valve, the normally closed liquid inlet valve and the connecting valve respectively through the driving control unit;

[0020] The data sending unit and the data processing unit are respectively connected. The data processing unit receives the driving control command sent by the remote server through the data receiving unit. The data processing unit sends the data in the data storage unit to the remote server through the data sending unit.

[0021] Preferably, a porous ceramic medium is inserted under the multi-medium measurement cavity module, and the porous ceramic medium contacts the soil;

[0022] The liquid in the fluid cavity enters the multi-media measurement cavity module through the opened connecting valve, and then exchanges water with the soil through the porous ceramic medium to achieve water potential balance.

[0023] Preferably, a soil conductivity sensor, a temperature sensor and a pH sensor are arranged in the multi-media measurement cavity module to collect EC values, temperature values ​​and pH values ​​in the multi-media measurement cavity module respectively, and the soil conductivity sensor, the temperature sensor and the pH sensor are electrically connected to the data processing unit respectively.

[0024] Preferably, a liquid level sensor is provided in the multi-media measurement cavity module, and the liquid level sensor is connected to the data processing unit to send the liquid level value of the multi-media measurement cavity module to the data processing unit, and the data processing unit judges and calculates the liquid level value of the multi-media measurement cavity module.

[0025] Preferably, the modular tension sensor device further comprises a positioning unit, the data processing unit is connected to the positioning unit, and the data processing unit sends the positioning data to the remote server via the data sending unit.

[0026] Preferably, when the modular tension sensor device measures the moisture status of multiple layers of soil, the remote server sends a drive control command to open the Nth connecting valve to the drive control unit through the data receiving unit and the data processing unit in sequence, and the Nth connecting valve is connected to the corresponding multi-media measurement cavity module of the layer to be measured, and the liquid in the fluid cavity enters the multi-media measurement cavity module of the layer to be measured through the second fluid pipeline, and merges with the liquid in the multi-media measurement cavity module of the layer to be measured, and the pressure values ​​in the multi-media measurement cavity of the layer to be measured and the fluid cavity are balanced, and the pressure value measured by the pressure sensor is the tension value corresponding to the layer to be measured, and the pressure sensor sends the tension value to the data processing unit, and the data processing unit sends the tension value to the data sending unit and the data storage unit respectively.

[0027] Preferably, when the liquid level value of the Nth multi-media measurement cavity module is less than or equal to the preset lower limit liquid level threshold, first, the data processing unit sends a drive control command to the drive control unit to open the Nth connecting valve, the fluid cavity is connected to the Nth multi-media measurement cavity module through the Nth connecting valve, and the liquid in the fluid cavity enters the Nth multi-media measurement cavity module through the second fluid pipeline; then, the data processing unit sends a drive control command to the drive control unit to open the normally closed liquid inlet valve, and the liquid in the fluid replenishment tank enters the fluid cavity through the first fluid pipeline; thereafter, the data processing unit sends a drive control command to the drive control unit to open the normally closed air outlet valve, and the vacuum pump extracts the gas in the fluid cavity through the gas pipeline; when the pressure value measured by the pressure sensor is greater than or equal to the preset pressure threshold, the data processing unit sends a drive control command to the drive control unit to close the normally closed air outlet valve, the normally closed liquid inlet valve and the Nth connecting valve.

[0028] The beneficial effects of the present invention are as follows: a modular tension sensor device for measuring multi-layer soil of the present invention connects a modular multi-media measurement cavity to a composite functional fluid cavity according to the actual needs of measuring the number of soil layers, and by opening and closing the connecting valve on the composite functional fluid cavity, a pressure sensor can be used to measure the tension value of the multi-layer soil. The present invention innovatively combines the composite functional fluid cavity and the modular multi-media measurement cavity into a sensing device, sharing a set of liquid replenishment and self-calibration external equipment, thereby solving the problem of high cost of the multi-layer soil tension measurement device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of a modular tension sensor device for measuring multi-layer soil according to the present invention. DETAILED DESCRIPTION

[0030] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0031] Embodiment 1:

[0032] An embodiment of the present invention provides a modular tension sensor device for measuring multi-layer soil, the modular tension sensor device comprising: a fluid chamber, a multi-medium measurement chamber module, a pressure sensor, a first fluid pipeline, a gas pipeline, a normally closed gas outlet valve, a normally closed liquid inlet valve, a connecting valve, a second fluid pipeline, a drive control unit, a data processing unit, a data storage unit, a data sending unit and a data receiving unit;

[0033] A first fluid pipeline and a gas pipeline are respectively arranged on the top of the fluid cavity, wherein one end of the first fluid pipeline is connected to the fluid cavity through a normally closed liquid inlet valve, and the other end of the first fluid pipeline is connected to a liquid replenishing tank to replenish the liquid in the fluid cavity; one end of the gas pipeline is connected to the fluid cavity through a normally closed gas outlet valve, and the other end of the gas pipeline is connected to a vacuum pump to extract the gas in the fluid cavity;

[0034] A pressure sensor is arranged at the bottom of the fluid chamber, the pressure sensor is connected to a data processing unit through a circuit, and the data processing unit is electrically connected to a data storage unit;

[0035] The pressure sensor sends the pressure value to the data processing unit, and the data processing unit stores the pressure value in the data storage unit;

[0036] The pressure value measured by the pressure sensor is the tension value corresponding to the layer to be measured;

[0037] A plurality of connecting valves are also arranged at the bottom of the fluid cavity, and each connecting valve is connected to the multi-media measuring cavity module through a second fluid pipeline;

[0038] The normally closed air outlet valve, the normally closed liquid inlet valve and the connecting valve are connected to the data processing unit through the driving control unit respectively, and the data processing unit sends opening and closing commands to the normally closed air outlet valve, the normally closed liquid inlet valve and the connecting valve respectively through the driving control unit;

[0039] The data sending unit and the data processing unit are respectively connected. The data processing unit receives the driving control command sent by the remote server through the data receiving unit. The data processing unit sends the data in the data storage unit to the remote server through the data sending unit.

[0040] The fluid chamber of the present invention can be cylindrical or in any other shape, and can be made of corrosion-resistant PVC, PE, metal, etc.

[0041] Embodiment 2

[0042] like Figure 1As shown, this embodiment provides a modular tension sensor device for measuring multi-layer soil, and the modular tension sensor device includes: a fluid cavity 1, a pressure sensor 2, an equipment protection cover 4, a waterproof port 5, a first fluid pipeline 7, a gas pipeline 6, a normally closed air outlet valve 8, a normally closed liquid inlet valve 9, an a-th connecting valve 10, a multi-media measurement cavity module a, a second fluid pipeline 11 of the multi-media measurement cavity module a, an electrical connection port 12 of the multi-media measurement cavity module a, a medium sensor 14 of the multi-media measurement cavity module a, a liquid level sensor 15 of the multi-media measurement cavity module a, a porous ceramic medium 16 of the multi-media measurement cavity module a, a b-th connecting valve 17, a multi-media measurement cavity module b, and a multi-media measurement cavity module b. The second fluid pipeline 18 of block b, the electrical connection port 19 of the multi-media measurement chamber module b, the medium sensor 21 of the multi-media measurement chamber module b, the liquid level sensor 22 of the multi-media measurement chamber module b, the porous ceramic medium 23 of the multi-media measurement chamber module b, the nth connecting valve 24, the multi-media measurement chamber module n, the second fluid pipeline 25 of the multi-media measurement chamber module n, the electrical connection port 26 of the multi-media measurement chamber module n, the medium sensor 28 of the multi-media measurement chamber module n, the liquid level sensor 29 of the multi-media measurement chamber module n, the porous ceramic medium 30 of the multi-media measurement chamber module n, the drive control unit, the data processing unit, the data storage unit, the data sending unit and the data receiving unit;

[0043] A first fluid pipeline 7 and a gas pipeline 6 are respectively arranged on the top of the fluid cavity 1, wherein one end of the first fluid pipeline 7 is connected to the fluid cavity 1 through a normally closed liquid inlet valve 9, and the other end of the first fluid pipeline 7 is connected to a liquid replenishing tank to replenish the liquid in the fluid cavity 1; one end of the gas pipeline 6 is connected to the fluid cavity 1 through a normally closed gas outlet valve 8, and the other end of the gas pipeline 6 is connected to a vacuum pump to extract the gas in the fluid cavity 1;

[0044] A pressure sensor 2 is arranged at the bottom of the fluid chamber 1, the pressure sensor 2 is connected to a data processing unit through a circuit, and the data processing unit is electrically connected to a data storage unit;

[0045] The pressure sensor 2 sends the tension value to the data processing unit, and the data processing unit stores the tension value in the data storage unit;

[0046] The bottom of the fluid chamber 1 is also provided with an ath connecting valve 10, a bth connecting valve 17 and an nth connecting valve 24, the ath connecting valve 10 is connected to the multi-media measuring chamber module a through the second fluid pipeline 11 of the multi-media measuring chamber module a, the bth connecting valve 17 is connected to the multi-media measuring chamber module b through the second fluid pipeline 18 of the multi-media measuring chamber module b, and the nth connecting valve 24 is connected to the multi-media measuring chamber module n through the second fluid pipeline 25 of the multi-media measuring chamber module n;

[0047] The normally closed air outlet valve 8, the normally closed liquid inlet valve 9, the ath connecting valve 10, the bth connecting valve 17 and the nth connecting valve 24 are respectively connected to the data processing unit through the drive control unit, and the data processing unit sends opening and closing commands to the normally closed air outlet valve 8, the normally closed liquid inlet valve 9, the ath connecting valve 10, the bth connecting valve 17 and the nth connecting valve 24 respectively through the drive control unit;

[0048] The data sending unit and the data processing unit are respectively connected. The data processing unit receives the driving control command sent by the remote server through the data receiving unit. The data processing unit sends the data in the data storage unit to the remote server through the data sending unit.

[0049] A porous ceramic medium 16 of the multi-media measuring cavity module a is inserted under the multi-media measuring cavity module a. The porous ceramic medium 16 of the multi-media measuring cavity module a contacts the soil 15 cm deep from the ground surface. The liquid in the tension sensor a reaches water potential balance by exchanging water with the soil 15 cm deep from the ground surface.

[0050] A porous ceramic medium 23 of the multi-media measurement cavity module b is inserted under the multi-media measurement cavity module b. The porous ceramic medium 23 of the multi-media measurement cavity module b contacts the soil 30 cm deep from the ground surface. The liquid in the multi-media measurement cavity module b reaches water potential balance by exchanging water with the soil 30 cm deep from the ground surface.

[0051] A porous ceramic medium 30 of the multi-media measurement cavity module n is inserted under the multi-media measurement cavity module n. The porous ceramic medium 30 of the multi-media measurement cavity module n contacts the soil 45 cm deep from the ground surface. The liquid in the multi-media measurement cavity module n reaches water potential balance by exchanging water with the soil 45 cm deep from the ground surface.

[0052] The medium sensor 14 of the multi-media measurement cavity module a includes a soil conductivity sensor, a temperature sensor and a pH sensor, which respectively collect the EC value, temperature value and pH value of the multi-media measurement cavity module a. The soil conductivity sensor, temperature sensor and pH sensor are respectively electrically connected to the data processing unit.

[0053] The medium sensor 21 of the multi-media measurement cavity module b also includes a soil conductivity sensor, a temperature sensor and a pH sensor, which respectively collect the EC value, temperature value and pH value of the multi-media measurement cavity module b. The soil conductivity sensor, temperature sensor and pH sensor are respectively electrically connected to the data processing unit.

[0054] The medium sensor 28 of the multi-media measurement cavity module n also includes a soil conductivity sensor, a temperature sensor and a pH sensor, which respectively collect the EC value, temperature value and pH value of the multi-media measurement cavity module n. The soil conductivity sensor, temperature sensor and pH sensor are respectively electrically connected to the data processing unit.

[0055] The liquid level sensor 15 of the multi-media measurement cavity module a is connected to the data processing unit, and sends the liquid level value of the liquid level sensor 15 of the multi-media measurement cavity module a to the data processing unit, and the data processing unit judges and calculates the liquid level value of the multi-media measurement cavity module a.

[0056] The liquid level sensor 22 of the multi-media measurement cavity module b is connected to the data processing unit, and sends the liquid level value of the liquid level sensor 22 of the multi-media measurement cavity module b to the data processing unit, and the data processing unit judges and calculates the liquid level value of the multi-media measurement cavity module b.

[0057] The liquid level sensor 29 of the multi-media measurement cavity module n is connected to the data processing unit, and sends the liquid level value of the liquid level sensor 29 of the multi-media measurement cavity module n to the data processing unit, and the data processing unit judges and calculates the liquid level value of the multi-media measurement cavity module n.

[0058] The medium sensor 14 of the multi-media measurement cavity module a and the liquid level sensor 15 of the multi-media measurement cavity module a are both connected to the data processing unit via the electrical connection port 12 of the multi-media measurement cavity module a.

[0059] The medium sensor 21 of the multi-media measurement cavity module b and the liquid level sensor 22 of the multi-media measurement cavity module b are both connected to the data processing unit via the electrical connection port 19 of the multi-media measurement cavity module b.

[0060] The medium sensor 28 of the multi-media measurement cavity module n and the liquid level sensor 29 of the multi-media measurement cavity module n are both connected to the data processing unit via the electrical connection port 26 of the multi-media measurement cavity module n.

[0061] Embodiment 3

[0062] When the modular tension sensor device measures the moisture status of multiple layers of soil, the remote server sends a drive control command to open the Nth connecting valve to the drive control unit through the data receiving unit and the data processing unit in sequence, the Nth connecting valve is connected to the multi-media measurement cavity module corresponding to the layer to be measured, the liquid in the fluid cavity enters the multi-media measurement cavity module corresponding to the layer to be measured through the second fluid pipeline, the pressure value measured by the pressure sensor is the tension value in the multi-media measurement cavity module corresponding to the layer to be measured, the pressure sensor sends the tension value to the data processing unit, and the data processing unit sends the tension value to the data sending unit and the data storage unit respectively.

[0063] Embodiment 4

[0064] When the liquid level value or pressure value of the Nth tension sensor is less than or equal to the preset lower limit liquid level threshold, first, the data processing unit sends a driving control command to the driving control unit to open the Nth connecting valve, the Nth connecting valve is connected to the Nth multi-media measurement cavity module, and the liquid in the fluid cavity enters the Nth multi-media measurement cavity module through the second fluid pipeline; then, the data processing unit sends a driving control command to the driving control unit to open the normally closed liquid inlet valve, and the liquid in the fluid replenishing tank enters the fluid cavity through the fluid pipeline; thereafter, the data processing unit sends a driving control command to the driving control unit to open the normally closed air outlet valve, and the vacuum pump extracts the gas in the fluid cavity through the gas pipeline; when the pressure value measured by the pressure sensor is greater than or equal to the preset pressure threshold, the data processing unit sends a driving control command to the driving control unit to close the normally closed air outlet valve, the normally closed liquid inlet valve and the Nth connecting valve.

[0065] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments after knowing the basic creative concept. Therefore, the claims should be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0066] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention should also include these modifications and variations.

Claims

1. A modular tension sensor device for measuring multi-layer soil, characterized in that: The modular tension sensor device comprises: a fluid cavity, a multi-media measurement cavity module, a pressure sensor, a first fluid pipeline, a gas pipeline, a normally closed gas outlet valve, a normally closed liquid inlet valve, a connecting valve, a second fluid pipeline, a drive control unit, a data processing unit, a data storage unit, a data sending unit and a data receiving unit; A first fluid pipeline and a gas pipeline are respectively arranged on the top of the fluid cavity, wherein one end of the first fluid pipeline is connected to the fluid cavity through a normally closed liquid inlet valve, and the other end of the first fluid pipeline is connected to a liquid replenishing tank to replenish the liquid in the fluid cavity; one end of the gas pipeline is connected to the fluid cavity through a normally closed gas outlet valve, and the other end of the gas pipeline is connected to a vacuum pump to extract the gas mixed in the fluid cavity; A pressure sensor is arranged at the bottom of the fluid chamber, the pressure sensor is connected to a data processing unit through a circuit, and the data processing unit is electrically connected to a data storage unit; A plurality of normally closed connecting valves are also arranged at the bottom of the fluid cavity, and each connecting valve is connected to the multi-media measuring cavity module through a second fluid pipeline; The normally closed air outlet valve, the normally closed liquid inlet valve and the connecting valve are connected to the data processing unit through the driving control unit respectively, and the data processing unit sends opening and closing commands to the normally closed air outlet valve, the normally closed liquid inlet valve and the connecting valve respectively through the driving control unit; The data sending unit and the data processing unit are respectively connected, the data processing unit receives the driving control command sent by the remote server through the data receiving unit, and the data processing unit sends the data in the data storage unit to the remote server through the data sending unit; a porous ceramic medium is inserted under the multi-media measurement cavity module, and the porous ceramic medium contacts the soil; The liquid in the fluid cavity enters the multi-media measurement cavity module through the opened connecting valve, and then exchanges water with the soil through the porous ceramic medium to achieve water potential balance; a soil conductivity sensor, a temperature sensor and a pH sensor are arranged in the multi-media measurement cavity module to respectively collect the EC value, the temperature value and the pH value in the multi-media measurement cavity module, and the soil conductivity sensor, the temperature sensor and the pH sensor are respectively electrically connected to the data processing unit; a liquid level sensor is arranged in the multi-media measurement cavity module, and the liquid level sensor is connected to the data processing unit to send the liquid level value of the multi-media measurement cavity module to the data processing unit, and the data processing unit processes the multi-media measurement cavity module. The liquid level value of the measuring cavity module is judged and calculated; the modular tension sensor device also includes a positioning unit, the data processing unit is connected to the positioning unit, and the data processing unit sends the positioning data to the remote server through the data sending unit; when the modular tension sensor device measures the moisture state of multiple layers of soil, the remote server sends a driving control command to open the Nth connecting valve to the driving control unit through the data receiving unit and the data processing unit in sequence, and the Nth connecting valve is connected to the corresponding multi-media measuring cavity module of the layer to be measured, and the liquid in the fluid cavity enters the multi-media measuring cavity module of the layer to be measured through the second fluid pipeline, and is connected to the multi-media measuring cavity module of the layer to be measured. The liquid in the multi-media measurement cavity module of the measuring layer merges, and the pressure values ​​in the multi-media measurement cavity of the layer to be measured and the fluid cavity reach equilibrium. The pressure value measured by the pressure sensor is the tension value corresponding to the layer to be measured. The pressure sensor sends the tension value to the data processing unit, and the data processing unit sends the tension value to the data sending unit and the data storage unit respectively. When the liquid level value of the Nth multi-media measurement cavity module is less than or equal to the preset lower limit liquid level threshold, first, the data processing unit sends a drive control command to the drive control unit to open the Nth connecting valve. The fluid cavity is connected to the Nth multi-media measurement cavity module through the Nth connecting valve, and the fluid cavity is The liquid enters the Nth multi-media measuring cavity module through the second fluid pipeline; then, the data processing unit sends a driving control command to the driving control unit to open the normally closed liquid inlet valve, and the liquid in the liquid replenishing tank enters the fluid cavity through the first fluid pipeline; thereafter, the data processing unit sends a driving control command to the driving control unit to open the normally closed air outlet valve, and the vacuum pump extracts the gas in the fluid cavity through the gas pipeline; when the pressure value measured by the pressure sensor is greater than or equal to the preset pressure threshold, the data processing unit sends a driving control command to the driving control unit to close the normally closed air outlet valve, the normally closed liquid inlet valve and the Nth connecting valve.

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