An in-situ measurement test method for the sublimation loss rate of water in simulated lunar soil

Abstract

The present invention discloses an in-situ measurement test method for the sublimation loss rate of water in hydrous simulated lunar soil. The in-situ measurement test method mainly includes two parts: an environmental simulation method and a test method. The environmental simulation method is based on ground vacuum thermal test technology, and a test system construction scheme is designed, which mainly consists of a vacuum thermal simulation chamber, a low-temperature heat sink, a pressure control system, an electronic balance, an electronic balance extension load device, an electronic balance thermal control system, and a sample thermal control system. It can simultaneously realize the simulation of the in-situ measurement environment of the lunar surface where the sample is located and the simulation of the ground working environment of the measuring equipment. The test method is based on the weighing method, and a test step including a combination of test conditions, test process design, and test data processing is designed. Through this method, quantitative results of the influence of vacuum degree, temperature, water content and density on the sublimation rate of water in hydrous simulated lunar soil can be obtained, providing support for the in-situ sampling design of the lunar exploration project mission.

Description

Technical Field

[0001] The present invention relates to the technical field of in-situ testing technology and vacuum thermal testing methods, and in particular to an in-situ measurement test method for the sublimation loss rate of water-containing simulated lunar soil. Background Art

[0002] Over decades of exploration, scientists have discovered that the lunar regolith contains varying amounts of various compounds in its surface, subsurface, and profile layers, potentially even water ice, a possible source of life. Currently, detection of water ice in lunar regolith relies primarily on remote sensing, which has its limitations and cannot accurately determine the actual presence of water ice. Returning samples for measurement on Earth is highly likely to be contaminated by the Earth's environment, preventing accurate data from being obtained. Therefore, in-situ exploration and utilization technologies are crucial for scientific exploration of the Moon.

[0003] my country's lunar exploration program, Chang'e-7, is scheduled to launch in 2024, land at the lunar South Pole, and conduct a comprehensive survey of the lunar South Pole from lunar orbit. A key scientific objective of this Chang'e mission is to directly confirm the presence of water ice in the permanently shadowed region of the lunar South Pole and determine its source and distribution through in-situ exploration. To achieve this scientific goal, water-containing lunar soil will be collected in situ, heated to release its volatile components, and the H2O content and its isotope ratio (D / H) will be measured using spectroscopy and mass spectrometry. To minimize the sample's initial state, it is necessary to minimize the loss of water molecules and isotope ratio changes caused by temperature rise during sample collection and transfer. Related research has shown that isotope ratio changes are correlated with the amount of water molecule loss, and controlling the amount of water molecule loss can effectively control isotope ratio changes.

[0004] To reduce the loss of water molecules from lunar regolith during in-situ collection, accurately understanding the impact of lunar surface environmental factors and the regolith's own properties on the water sublimation rate is essential. Authentically simulating the lunar surface in-situ collection environment and accurately measuring the water loss sublimation rate of the simulated lunar regolith containing water are key to solving this problem. Therefore, this paper proposes an in-situ test method for measuring the water loss rate of simulated lunar regolith containing water. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems and to propose an in-situ measurement test method for the water sublimation loss rate of water-containing simulated lunar soil.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An in-situ measurement test method for the water sublimation loss rate of hydrated simulated lunar regolith is provided. A vacuum simulation device for recording real-time weight data of sample tests is provided in the test system to record the real-time weight data of samples with different characteristics under various test conditions. Simultaneously, the water sublimation loss rate of the hydrated lunar regolith is measured and calculated using a weighing method in a simulated lunar surface environment, and the effects of different low-temperature zones, vacuum levels, water contents, and compactness on the water sublimation rate of the hydrated lunar regolith are determined. The method specifically comprises the following steps:

[0008] (1) Prepare samples, including pure water ice and multiple groups of simulated lunar soils with different water contents and densities, and embed temperature sensors in each sample;

[0009] (2) Error calibration of the vacuum simulation device;

[0010] (3) Conduct experimental studies on the effect of vacuum on the sublimation loss rate of water in simulated lunar regolith;

[0011] (4) Conduct experimental research on the effect of low temperature on the sublimation rate of water in simulated lunar soil.

[0012] Preferably, the vacuum simulation device includes: a vacuum thermal simulation chamber, a low-temperature heat sink, a pressure control system, two electronic balances, an electronic balance extended loading device, an electronic balance thermal control system, and a sample thermal control system. The electronic balance thermal control system consists of a thermal control cabin, a film heater, a radiation shield, a temperature sensor, a programmable power supply group, and a temperature controller. The electronic balance extended loading device consists of an upper connecting flange, a lower connecting flange, two sets of thermal insulation rings, a thermal insulation sheet, a set of connecting bolts, and a tray. The sample thermal control system consists of an infrared heating cage, a temperature sensor, a programmable power supply group, and a temperature controller. The temperature sensor is embedded in the sample when the sample is made. The vacuum thermal simulation chamber is used to simulate the cold and dark environment of the lunar surface; the combined effect of the low-temperature heat sink and the infrared heating cage can adjust the temperature of the sample; the vacuum degree in the vacuum thermal simulation chamber can be adjusted by the pressure control system; the electronic balance is used to measure the weight data of the sample during each working condition test. The positions of the two electronic balances are relatively symmetrical in the vacuum thermal simulation chamber and the infrared heating cage to ensure that the radiation heat exchange environment received by the sample is consistent; the electronic balance extended loading device is mainly used to extend the tray of the electronic balance to the outside of the thermal control cabin. It is made of thermal insulation material polyimide, and the upper surface of the electronic balance extended loading device is covered with a multi-layer thermal insulation component to prevent mutual interference between the electronic balance temperature and the sample temperature;

[0013] The thermal control cabin is composed of a bottom frame and a cover plate. The bottom frame has ears on both sides, and a circular hole is opened in the middle of the cover plate. Through holes are opened at the corresponding positions of the bottom frame ears and the cover plate for installing screws to assemble the thermal control cabin. The thermal control cabin is made of a thermally conductive metal material, and the outer surface of the thermal control cabin is covered with a multi-layer thermal insulation component to reduce the impact of external ambient temperature changes on the temperature control stability of the thermal control cabin.

[0014] The film heater is attached to the six inner surfaces of the thermal control cabin to achieve active temperature control;

[0015] The radiation shield is made of thermal insulation material polytetrafluoroethylene, and its outer surface is covered with a multi-layer thermal insulation component to secondary reduce the impact of external environmental temperature changes on the temperature control stability of the thermal control cabin.

[0016] Preferably, the method for performing error calibration on the vacuum simulation device in step (2) specifically includes the following steps:

[0017] (2A) Two metal weights are used in place of the sample and placed on an electronic balance within the vacuum thermal simulation chamber. The pressure control system is activated to maximize the vacuum level, while the low-temperature heat sink establishes a low-temperature background. The electronic balance thermal control system is adjusted to stabilize the temperature of both thermal control chambers at a fixed temperature within the normal operating temperature range of the electronic balance. The changes in the balance readings over time are recorded over a period of time. The fluctuation rate of the readings of the two electronic balances at this temperature is then calculated using the formula:

[0018]

[0019] Where, l is the fluctuation rate of the electronic balance reading, m max 、m min They are the maximum and minimum values ​​of the electronic balance reading within the time period respectively;

[0020] (2B) When the water sublimation rate calculated by measurement in a formal test is less than the fluctuation value of the electronic balance reading, this value cannot be used as the test result.

[0021] Preferably, the experimental study method for the effect of vacuum degree on the water sublimation loss rate of water-containing simulated lunar soil in step (3) specifically includes the following steps:

[0022] (3A) First, conduct the test using pure water ice, start the pressure control system to make the vacuum degree reach the highest value, establish a low-temperature background using the low-temperature heat sink, adjust the electronic balance thermal control system to stabilize the temperature of the thermal control cabin at the same temperature corresponding to step (2), and then adjust the product thermal control system to keep the temperature of the pure water ice at a fixed temperature in the low-temperature zone;

[0023] (3B) After the temperature of the pure water ice stabilizes, adjust the pressure control system to gradually reduce the vacuum degree in the vacuum thermal simulation chamber until it reaches the target vacuum degree. Record the changes in the vacuum degree and the electronic balance reading over time.

[0024] (3C) Take the two electronic balance readings before and after each vacuum stability interval as the initial weight and the weight after the change, respectively, and calculate the water sublimation loss rate of the water-containing simulated lunar soil under different vacuum degrees according to formula (2).

[0025]

[0026] Where s is the water sublimation loss rate, m0, m t are the initial weight and weight after change of the sample in the time interval Δt, respectively, and V is the surface area of ​​the sample when it is made;

[0027] (3D) Analyze the calculation results of water sublimation loss rate and determine whether the effect of vacuum on water sublimation loss rate is obvious. If it is obvious, use simulated lunar soil with different water content and density as samples in turn, and conduct experiments according to step (3) to obtain the effect of vacuum change on water sublimation loss rate of simulated lunar soil with different water content and density. If it is not obvious, it can be directly concluded that vacuum has no obvious effect on water sublimation loss rate of simulated lunar soil.

[0028] Preferably, the method for conducting an experimental study on the effect of low temperature on the sublimation rate of simulated lunar soil water in step (4) specifically comprises the following steps:

[0029] (4A) First, conduct the test using pure water ice, start the pressure control system to make the vacuum degree reach the highest value, and the low-temperature heat sink to establish a low-temperature background. Adjust the electronic balance thermal control system to stabilize the temperature of the thermal control cabin at the same temperature corresponding to step (2). Then adjust the product thermal control system to reduce the temperature of the pure water ice to the initial low temperature.

[0030] (4B) After the pure water ice temperature stabilizes, set multiple nodes in the range from the initial low temperature to the target low temperature, adjust the product thermal control system, and make the pure water ice temperature reach a node, maintain it for a period of time, and then move to the next node, and record the temperature and electronic balance reading changes over time;

[0031] (4C) Take the two electronic balance readings before and after each temperature stabilization interval as the initial weight and the weight after the change, respectively, and calculate the water sublimation loss rate of the simulated lunar soil at different low temperatures according to formula (2);

[0032] (4D) Analyze the calculation results of the water sublimation loss rate to determine whether the low temperature has a significant effect on the water sublimation loss rate. If so, use simulated lunar soils with different water contents and densities as samples, and conduct experiments according to step (4) to obtain the effect of temperature changes in the low temperature zone on the water sublimation loss rate of simulated lunar soils with different water contents and densities. If not, it can be directly concluded that the low temperature in this area has no significant effect on the water sublimation loss rate of simulated lunar soils.

[0033] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0034] 1. In this application, a basic weighing measurement method is used. The principle is simple. By reasonably combining the environmental factors and the characteristics of the water-containing simulated lunar soil to carry out experiments and select the test data, the influence of changes in the two environmental factors of vacuum and temperature on the water sublimation loss rate of water-containing simulated lunar soils with different water contents and densities can be obtained, providing support for the in-situ sampling design of the lunar exploration project.

[0035] 2. In this application, the in-situ test method was used to achieve a realistic simulation of the in-situ sampling environment of the lunar surface of the sample. The designed and developed electronic balance thermal control system provided a normal working environment for the test equipment, ensuring the accuracy of the measurement data, and the measurement accuracy reached 10-6g / min. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Shown is a schematic diagram of a test system provided in an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of the explosion structure of an electronic balance expansion loading device according to an embodiment of the present invention is shown;

[0038] Figure 3 A test flow chart according to an embodiment of the present invention is shown.

[0039] Legend:

[0040] 1. Specimen; 2. Extended loading device for electronic balance; 3. Radiation shield; 4. Thermal control cabin; 5. Thin film heater; 6. Electronic balance; 7. Thermal insulation column; 8. Vibration isolation plate; 9. Infrared heating cage; 10. Mounting platform; 11. Low-temperature heat sink; 12. Vacuum thermal simulation chamber; 13. Second temperature controller; 14. Second programmable power supply; 15. Second temperature sensor; 16. First temperature controller; 17. First programmable power supply; 18. First temperature sensor; 19. DC power supply; 20. Electronic balance monitoring and control system; 21. Pressure control system; 22. Tray; 23. Connecting bolts; 24. Upper connecting flange; 25. Thermal insulation ring; 26. Thermal insulation sheet; 27. Lower connecting flange. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0042] See also Figure 1-3 , the present invention provides a technical solution:

[0043] An in-situ measurement test method for the water sublimation loss rate of hydrated simulated lunar soil is provided. A vacuum simulation device for recording real-time weight data of sample 1 in a test system is provided to record the real-time weight data of sample 1 with different characteristics under various test conditions. Simultaneously, the water sublimation loss rate of the hydrated lunar soil is measured and calculated using a weighing method in a simulated lunar surface environment, and the effects of different low-temperature zones, vacuum levels, water contents, and compactness on the water sublimation rate of the hydrated lunar soil are determined. The method specifically includes the following steps:

[0044] (1) Prepare sample 1, including pure water ice and multiple groups of simulated lunar soils with different water contents and densities, and embed a temperature sensor in each sample 1;

[0045] (2) Error calibration of the vacuum simulation device;

[0046] (3) Conduct experimental studies on the effect of vacuum on the sublimation loss rate of water in simulated lunar regolith;

[0047] (4) Conduct experimental research on the effect of low temperature on the sublimation rate of water in simulated lunar soil.

[0048] Specifically, such as Figure 1 As shown, the test system includes a vacuum thermal simulation chamber 12, a low-temperature heat sink 11, a mounting platform 10, a vibration isolation plate 8, a set of thermal insulation columns 7, an infrared heating cage 9, two electronic balances 6, two electronic balance extended loading devices 2, two thermal control cabins 4, a radiation shield 3, two sets of film heaters 5, two groups of temperature sensors (group A temperature sensor 18 and group B temperature sensor 2 15), two groups of temperature controllers (group A temperature controller 16 and group B temperature controller 2 13), two groups of programmable power supplies (group A programmable power supply 17 and group B programmable power supply 2 14), a pressure control system 21, an electronic balance monitoring and control system 20, and a DC power supply 19; the electronic balance extended loading device 2 consists of an upper connecting flange 24, a lower connecting flange 27, two groups of thermal insulation rings 25, a thermal insulation sheet 26, a group of connecting bolts 23, and a tray 22.

[0049] Before the test, thin film heaters 5 were attached to the five inner surfaces of the bottom frames and the lower surface of the cover of the two thermal control cabins 4. Group A temperature sensors 5 were attached to each inner surface of the thermal control cabins 4, with two attached to each surface and one as a backup. The six outer surfaces of the thermal control cabins 4 were covered with multi-layer thermal insulation components, and the five outer surfaces of the radiation shield 3 were covered with multi-layer thermal insulation components. The measurement and control data cable and power cable of the electronic balance 6 were replaced and extended with high and low temperature resistant polytetrafluoroethylene wires to adapt to the environment inside the vacuum thermal simulation chamber 12 and ensure the normal operation of the electronic balance 6. The cut parts were used for connections outside the vacuum thermal simulation chamber 12;

[0050] like Figure 1As shown, during the test preparation stage, the vibration isolation plate 8 is placed on the mounting platform 10 in the vacuum thermal simulation chamber 12, the bottom frame of the thermal control cabin 4 is fixedly mounted on the vibration isolation plate 8 via the thermal insulation column 7, the electronic balance 6 is horizontally placed in the bottom frame of the thermal control cabin 4, and the electronic balance 6 is started, the lower connecting flange 27 of the electronic balance extension loading device 2 is connected to the weight sensor interface of the electronic balance 6, and then a set of thermal insulation rings 25, thermal insulation sheets 26, another set of thermal insulation rings 25, and the upper connecting flange 24 are connected and fixed to the lower connecting flange 27 via a set of connecting bolts 23 in sequence, and the thermal control cabin 4 is buckled. After completing the installation of the two test devices in this manner, the radiation shield 3 covers the two thermal control cabins 4 and buckles them onto the vibration isolation plate 8. The tray 22 interface of the electronic balance extended loading device 2 is passed through the circular holes on the radiation shield 3 and the thermal control cabin 4 cover in sequence and docked with the upper connecting flange 24 interface of the electronic balance extended loading device 2. The measurement and control data line and power line of the electronic balance 6, the power line of the thin film heater 5, and the lead wires of the group A temperature sensor 18 are all passed through the circular holes of the thermal control cabin 4 and the circular holes of the radiation shield 3. In this way, the thermal control implementation of the working environment simulation of the electronic balance 6 is realized;

[0051] When conducting the test, follow Figure 3 The test flow chart shown in the figure includes the following steps:

[0052] (1) Prepare sample 1 according to the specific requirements of the experiment: mainly including pure water ice and multiple groups of water-containing simulated lunar soil with different water contents and densities, and pre-embed the temperature sensors 15 of group B in sample 1. Each sample 1 is pre-embedded with three sensors, one at the center of the sample, the inner wall and the outer wall of the sample box, and the prepared sample 1 is stored in a refrigerator; then take out the required sample 1 for storage and place it in the tray 22 of two electronic balance extension loading devices 2, cover it with an infrared heating cage 9 and adjust its position so that the two samples 1 are located at symmetrical positions of the infrared heating cage 9 to ensure that the thermal radiation environment of the sample 1 is consistent;

[0053] (2) Error calibration of the vacuum simulation device: two metal weights are used to replace the sample 1 and placed in the tray 22 of the electronic balance extension loading device 2 for testing. The door of the vacuum thermal simulation chamber 12 is closed and the pressure control system 21 is started to make the vacuum degree reach 1X10 -5 Pa, and at the same time, start the low-temperature heat sink 11 to establish a low-temperature background, set the target temperature of the temperature controller 16 of group A to 20°C, and make the temperature of the two thermal control cabins 4 stable at 20°C. After the temperature stabilizes, record the change of the reading of the balance over time within 5 hours, and calculate the fluctuation rate of the reading of the two electronic balances 6 according to formula (1);

[0054] (3) Conducting experimental studies on the effect of vacuum on the water sublimation loss rate of simulated lunar regolith containing water:

[0055] (3A) First, conduct the test with pure water ice, close the door of the vacuum thermal simulation chamber 12, start the pressure control system 21 and make the vacuum degree reach 1X10 -5 Pa, and simultaneously start the low-temperature heat sink 11 to establish a low-temperature background, set the target temperature of the temperature controller 16 of group A to 20°C, and stabilize the temperature of the two thermal control cabins 4 at 20°C, then adjust the product thermal control system to keep the pure water ice temperature at -100°C;

[0056] (3B) After the temperature of the pure water ice stabilizes, the pressure control system 21 is adjusted to gradually reduce the vacuum degree in the vacuum thermal simulation chamber 12 until it reaches 1×10 -2 Pa, record the changes of vacuum degree and electronic balance 6 reading over time;

[0057] (3C) respectively take the vacuum degree at 10 -5 , 10 -2 The readings of the two electronic balances 6 before and after the magnitude interval are respectively used as the initial weight and the weight after the change, and the water sublimation loss rate of the simulated lunar soil containing water under different vacuum degrees is calculated according to formula (2);

[0058]

[0059] Where s is the water sublimation loss rate, m0, m t are the initial weight and weight after change of sample 1 in the time interval Δt, respectively, and V is the surface area of ​​sample 1 when it was made;

[0060] (3D) Analyze the calculation results of the water sublimation loss rate to determine whether the effect of vacuum on the water sublimation loss rate is obvious. If it is obvious, use simulated lunar soils with different water contents and densities as sample 1, and conduct experiments according to step (3) to obtain the effect of vacuum on the water sublimation loss rate of simulated lunar soils with different water contents and densities. If it is not obvious, it can be directly concluded that vacuum has no obvious effect on the water sublimation loss rate of simulated lunar soils.

[0061] (4) Conducting experimental studies on the effects of low temperatures on the sublimation rate of simulated lunar soil water:

[0062] (4A) First, conduct the test with pure water ice, close the door of the vacuum thermal simulation chamber 12, start the pressure control system 21 and make the vacuum degree reach 1X10 -5 Pa, and at the same time, start the low-temperature heat sink 11 to establish a low-temperature background, adjust the electronic balance thermal control system, set the target temperature of the temperature controller of group A to 20°C, so that the temperature of the two thermal control cabins 4 are both stable at 20°C, and then set the target temperature of the temperature controller 13 of group B to -120°C, so that the temperature of the pure water ice drops to -120°C;

[0063] (4B) After the temperature of pure water ice stabilizes, maintain it for 2 hours, then increase the temperature in steps of 10°C to -70°C. After each temperature step stabilizes, maintain it for 2 hours, and record the changes in temperature and electronic balance reading over time.

[0064] (4C) Take the readings of two electronic balances 6 before and after each temperature is maintained for 2 hours as the initial weight and the weight after the change, and calculate the sublimation loss rate of pure water ice water at different low temperatures according to formula (2);

[0065] (4D) Analyze the calculation results of the water sublimation loss rate to determine whether the low temperature has a significant effect on the water sublimation loss rate. If so, use simulated lunar soils with different water contents and densities as sample 1, and conduct experiments according to step (4) to obtain the effect of temperature changes in the low temperature zone on the water sublimation loss rate of simulated lunar soils with different water contents and densities. If not, it can be directly concluded that the low temperature in this area has no significant effect on the water sublimation loss rate of simulated lunar soils.

[0066] The above description of the embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An in-situ measurement test method for the water sublimation loss rate of simulated lunar soil containing water, characterized by: A vacuum simulation device for recording real-time weight data of the sample (1) is provided in the test system, and is used to record the real-time weight data of the sample (1) with different characteristics in each test condition. At the same time, in a simulated lunar surface environment, the water sublimation loss rate of the hydrated lunar soil is measured and calculated using a weighing method, and the influence of different low temperature zones, vacuum degrees, water contents and density factors on the water sublimation rate of the hydrated lunar soil is obtained. Specifically, the following steps are included: (1) preparing samples (1), including pure water ice and multiple groups of water-containing simulated lunar soils with different water contents and densities, and pre-embedding temperature sensors in each sample (1); (2) Calibrate the error of the vacuum simulation device; (3) Conducting experimental studies on the effect of vacuum on the water sublimation loss rate of simulated lunar regolith containing water; (4) Conducting experimental studies on the effects of low temperatures on the sublimation rate of water in simulated lunar soil; The vacuum simulation device comprises: a vacuum thermal simulation chamber (12), a low-temperature heat sink (11), a pressure control system (21), an electronic balance (6), an electronic balance extended loading device (2), an electronic balance thermal control system, and a sample (1) thermal control system; The electronic balance thermal control system is composed of a thermal control cabin (4), a film heater (5), a radiation shield (3), a temperature sensor (18), a programmable power supply (17), and a temperature controller (16); the sample (1) thermal control system is composed of an infrared heating cage (9), a temperature sensor (15), a programmable power supply (14), and a temperature controller (13); and the electronic balance extended loading device (2) is composed of an upper connecting flange (24), a lower connecting flange (27), a thermal insulation ring (25), a thermal insulation sheet (26), connecting bolts (23), and a tray (22).

2. The in-situ measurement test method for the water sublimation loss rate of aqueous simulated lunar soil according to claim 1, characterized in that: The method for performing error calibration on the vacuum simulation device in step (2) specifically includes the following steps: (2A) Two metal weights are used to replace the sample (1) and placed on the electronic balance in the vacuum thermal simulation chamber. The pressure control system is started to make the vacuum degree reach the highest value. At the same time, the low-temperature heat sink establishes a low-temperature background. The electronic balance thermal control system is adjusted to make the temperature of the two thermal control cabins stable at a fixed temperature within the normal operating temperature range of the electronic balance. The change of the balance reading over time over a period of time is recorded. The fluctuation rate of the reading of the two electronic balances at this temperature is obtained according to the formula: Where l is the fluctuation rate of the electronic balance reading, 、 They are the maximum and minimum values ​​of the electronic balance reading within a certain time period respectively; (2B) When the water sublimation rate calculated by measurement in a formal test is less than the fluctuation value of the electronic balance indication, this value cannot be used as the test result.

3. The in-situ measurement test method for the water sublimation loss rate of aqueous simulated lunar soil according to claim 1, characterized in that: The experimental study method for the effect of vacuum degree on the water sublimation loss rate of water-containing simulated lunar soil in step (3) specifically includes the following steps: (3A) First, conduct the test with pure water ice, start the pressure control system to make the vacuum degree reach the highest value, and the low-temperature heat sink to establish a low-temperature background. Adjust the electronic balance thermal control system to stabilize the temperature of the thermal control cabin at the same temperature corresponding to step (2). Then adjust the product thermal control system to keep the temperature of the pure water ice at a fixed temperature in the low-temperature zone. (3B) After the temperature of the pure water ice stabilizes, adjust the pressure control system to gradually reduce the vacuum degree in the vacuum thermal simulation chamber until it reaches the target vacuum degree. Record the changes in the vacuum degree and the electronic balance reading over time. (3C) Take the two electronic balance readings before and after each vacuum stability interval as the initial weight and the weight after the change, respectively, and calculate the water sublimation loss rate of the water-containing simulated lunar soil under different vacuum degrees according to formula (2); Where, s is the water sublimation loss rate, 、 They are Initial weight and weight after change of sample (1) in the time interval, V is the surface area of ​​the specimen (1) when it was prepared; (3D) Analyze the calculation results of the water sublimation loss rate to determine whether the effect of vacuum on the water sublimation loss rate is obvious. If it is obvious, use simulated lunar soils with different water contents and densities as samples (1) in turn, and conduct experiments according to step (3) to obtain the effect of vacuum changes on the water sublimation loss rate of simulated lunar soils with different water contents and densities. If it is not obvious, it can be directly concluded that vacuum has no obvious effect on the water sublimation loss rate of simulated lunar soil.

4. The in-situ measurement test method for the water sublimation loss rate of aqueous simulated lunar soil according to claim 1, characterized in that: The method for conducting the experimental study on the effect of low temperature on the sublimation rate of simulated lunar soil water in step (4) specifically includes the following steps: (4A) First, conduct the test with pure water ice, start the pressure control system to make the vacuum degree reach the highest value, and the low-temperature heat sink to establish a low-temperature background. Adjust the electronic balance thermal control system to stabilize the temperature of the thermal control cabin at the same temperature corresponding to step (2). Then adjust the product thermal control system to make the pure water ice temperature drop to the initial low temperature. (4B) After the pure water ice temperature stabilizes, set multiple nodes in the range from the initial low temperature to the target low temperature, adjust the product thermal control system, make the pure water ice temperature reach a node, maintain it for a period of time, and then move to the next node, record the temperature and electronic balance reading changes over time; (4C) Take the two electronic balance readings before and after each temperature stability interval as the initial weight and the weight after the change, respectively, and calculate the water sublimation loss rate of the water-containing simulated lunar soil at different low temperatures according to formula (2); (4D) Analyze the calculation results of the water sublimation loss rate to determine whether the low temperature has a significant effect on the water sublimation loss rate. If so, use simulated lunar soils with different water contents and densities as samples (1) and conduct experiments according to step (4) to obtain the effect of temperature changes in the low temperature zone on the water sublimation loss rate of simulated lunar soils with different water contents and densities. If not, it can be directly concluded that the low temperature zone has no significant effect on the water sublimation loss rate of simulated lunar soils.

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