CN115855729A - In-situ measurement test method for water sublimation loss rate of water-containing simulated lunar soil - Google Patents
In-situ measurement test method for water sublimation loss rate of water-containing simulated lunar soil Download PDFInfo
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Abstract
The invention discloses an in-situ measurement test method for water sublimation loss rate of water-containing simulated lunar soil. The in-situ measurement test method mainly comprises an environment simulation method and a test method. The environment simulation method is based on a ground vacuum thermal test technology, and a test system construction scheme mainly composed of a vacuum thermal simulation chamber, a low-temperature heat sink, a pressure control system, an electronic balance extended loading device, an electronic balance thermal control system and a sample thermal control system is designed, so that the simulation of the in-situ measurement environment of a lunar surface where a sample is located and the simulation of the ground working environment of measurement equipment can be realized at the same time. The test method is based on a weighing method, and comprises the test steps of test condition combination, test flow design and test data processing, and by the method, quantitative results of influences of vacuum degree, temperature, moisture content and compactness on the water sublimation rate of the water-containing simulated lunar soil can be obtained, so that support is provided for in-situ sampling design of a lunar exploration project task.
Description
Technical Field
The invention relates to the technical field of in-situ test technology and vacuum thermal test methods, in particular to an in-situ measurement test method for simulating the sublimation loss rate of lunar soil water by water content.
Background
During decades of exploration, scientists have discovered that varying amounts of various compounds, even water ice, can be the source of life, are present in lunar soil surfaces, subsurface, and boundary layers. At present, most of detection aiming at lunar soil water ice is remote sensing observation means, the means have limitations and cannot accurately know the actual existence condition of the water ice, and sampling is returned to the earth for measurement, so that the earth environment is very likely to be polluted, and real data cannot be obtained. Therefore, the in-situ exploration and utilization technology has important significance for scientific exploration of the moon.
In the moon exploration project task of China, chang' e seven is expected to be launched in 2024, land on the lunar Antarctic, and comprehensively investigate the lunar Antarctic on a lunar orbit. The important scientific detection target of Chang' e is to directly verify that water ice exists in the south pole permanent shadow area of the moon and determine the source and distribution of the water ice for the first time by means of in-situ detection. To achieve this scientific goal, the water-containing lunar soil is collected in situ, heated to release volatile components, and subjected to spectroscopy and mass spectrometry for H 2 Content of O andthe isotopic ratio (D/H) was measured. In order to ensure the initial state of the sample as much as possible, the water molecule loss and isotope ratio change caused by temperature rise in the sample collection and transfer processes need to be reduced. Relevant researches show that the change of the isotope ratio is related to the loss of water molecules, and the purpose of controlling the change of the isotope ratio can be achieved by controlling the loss of the water molecules.
In order to reduce the loss of water molecules in lunar soil in the in-situ collection process, the accurate acquisition of lunar surface environmental factors and the influence of lunar soil characteristics on the water sublimation rate is the basis, the real simulation of lunar surface in-situ collection environment, and the accurate measurement of the water loss sublimation rate of the water-containing simulated lunar soil is the key for solving the problem. Therefore, the invention provides an in-situ measurement test method for the sublimation loss rate of water in water-containing simulated lunar soil water.
Disclosure of Invention
The invention aims to: in order to solve the problems, an in-situ measurement test method for the sublimation loss rate of water containing simulated lunar soil water is provided.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a test method is measured to moisture simulation lunar soil water sublimation loss rate normal position, is provided with the vacuum analogue means of the real-time weight data of sample test in test system for the real-time weight data of the sample of record different characteristics in each experimental operating mode, simultaneously, in simulating the lunar surface environment, utilizes weighing method measurement to calculate the lunar soil water sublimation loss rate of moisture, and obtains the influence of different low temperature zone, vacuum, moisture content and closely knit degree factor to lunar soil water sublimation rate, specifically includes the following step:
(1) Preparing samples, including pure water ice and a plurality of groups of water-containing simulated lunar soils with different water contents and different compactness, and respectively embedding a temperature sensor in each sample;
(2) Calibrating errors of the vacuum simulation device;
(3) Carrying out experimental study on the influence of the vacuum degree on the sublimation loss rate of the water-containing simulated lunar soil water;
(4) And carrying out experimental study on the influence of low temperature on the simulated lunar soil water sublimation rate.
Preferably, the vacuum simulation apparatus includes: the device comprises 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, wherein the electronic balance thermal control system consists of a thermal control cabin, a film heater, a radiation-proof cover, a temperature sensor, a program-controlled power supply set and a temperature controller, the electronic balance extended loading device consists of 1 upper connecting flange, 1 lower connecting flange, 2 groups of heat insulation rings, 1 heat insulation sheet, 1 group of connecting bolts and 1 tray, the sample thermal control system consists of an infrared heating cage, a temperature sensor, a program-controlled power supply set and a temperature controller, and the temperature sensor is pre-embedded in the sample when the sample is manufactured; the vacuum thermal simulation chamber is used for simulating a cold and black environment of the lunar surface; the temperature of the sample can be adjusted through the comprehensive effect of the low-temperature heat sink and the infrared heating cage; the vacuum degree in the vacuum thermal simulation chamber can be adjusted through a pressure control system; the electronic balances are used for measuring weight data of the sample in the test process under each working condition, and the two electronic balances are positioned in the vacuum thermal simulation chamber and are relatively symmetrical with the infrared heating cage, so that the radiation heat exchange environment of the sample is consistent; the electronic balance extended loading device is mainly used for extending a tray of the electronic balance out of a thermal control cabin, is made of heat-insulating material polyimide, and is coated on the upper surface of the electronic balance extended loading device by a plurality of layers of heat-insulating assemblies, so that the mutual interference between the temperature of the electronic balance and the temperature of a sample is prevented;
the thermal control cabin is composed of a bottom frame and a cover plate, wherein the two sides of the bottom frame are provided with lugs, the middle of the cover plate is provided with a round hole, the lugs of the bottom frame and the corresponding positions of the cover plate are provided with through holes for mounting screws to assemble the thermal control cabin, the thermal control cabin is made of a metal material with thermal conductivity, the outer surface of the thermal control cabin is coated by a plurality of layers of heat insulation components, and the influence of the external environment temperature change on the temperature control stability of the thermal control cabin is reduced;
the film heater is attached to six inner surfaces of the thermal control cabin and used for realizing active temperature control;
the radiation protection cover is made of heat insulation materials, namely polytetrafluoroethylene, the outer surface of the radiation protection cover is coated with a plurality of layers of heat insulation assemblies, and the influence of the temperature change of the external environment on the temperature control stability of the thermal control cabin is reduced for the second time.
Preferably, the method for calibrating the error of the vacuum simulation apparatus in the step (2) specifically includes the following steps:
(2A) Two metal counterweights are used for replacing a sample, the sample is placed on an electronic balance in a vacuum thermal simulation chamber, a pressure control system is started to enable the vacuum degree to reach the highest value, and meanwhile, a low-temperature background is established by a low-temperature heat sink. Adjusting the thermal control system of the electronic balance to stabilize the temperature of the two thermal control cabins at a certain fixed temperature in the normal working temperature area of the electronic balance, recording the change condition of the readings of the balance in a period of time along with the time, and obtaining the fluctuation rate of the readings of the two electronic balances at the temperature according to a formula:
wherein l is the index fluctuation rate of the electronic balance, m max 、m min Respectively representing the maximum value and the minimum value of the readings of the electronic balance in time;
(2B) When the measured and calculated water sublimation rate is smaller than the indication fluctuation value of the electronic balance in the formal test, the value cannot be used as the test result.
Preferably, the experimental research method for the influence of the development vacuum degree on the sublimation loss rate of the water-containing simulated lunar soil water in the step (3) specifically comprises the following steps:
(3A) Firstly, testing with pure water ice, starting a pressure control system to enable the vacuum degree to reach the highest value, establishing a low-temperature background by a low-temperature heat sink, adjusting a thermal control system of the electronic balance to enable the temperature of the thermal control cabin to be stabilized at the same temperature corresponding to the step (2), and then adjusting a product thermal control system to enable the temperature of the pure water ice to be kept at a certain fixed temperature in a low-temperature area;
(3B) After the temperature of the pure water ice is stable, adjusting a pressure control system to gradually reduce the vacuum degree in the vacuum thermal simulation chamber until the target vacuum degree is reached, and recording the time-varying conditions of the vacuum degree and the readings of an electronic balance;
(3C) And taking readings of the front electronic balance and the rear electronic balance in each vacuum degree stable interval as initial weight and changed weight respectively, and calculating the water-containing simulated lunar soil water sublimation loss rate under different vacuum degrees according to a formula (2).
Wherein s is the sublimation loss rate of water, m 0 、m t Respectively the initial weight and the changed weight of the sample in a delta t time interval, and V is the surface area of the sample during the preparation;
(3D) Analyzing the calculation result of the water sublimation loss rate, judging whether the influence of the vacuum degree on the water sublimation loss rate is obvious, if so, sequentially using the water-containing simulated lunar soil with different water contents and different compactness as a sample, and carrying out a test according to the step (3) to obtain the influence of the change of the vacuum degree on the water sublimation loss rate of the water-containing simulated lunar soil with different water contents and different compactness; if not obvious, the conclusion can be directly drawn that the vacuum degree has no obvious influence on the sublimation loss rate of the simulated lunar soil water.
Preferably, the method for developing the experimental study of the influence of the low temperature on the simulated lunar soil water sublimation rate in the step (4) specifically comprises the following steps:
(4A) Firstly, testing with pure water ice, starting a pressure control system to enable the vacuum degree to reach the highest value, establishing a low-temperature background by a low-temperature heat sink, adjusting a thermal control system of the electronic balance to enable the temperature of the thermal control cabin to be stabilized at the same temperature corresponding to the step (2), and then adjusting a product thermal control system to enable the temperature of the pure water ice to be reduced to the initial low temperature;
(4B) After the temperature of the pure water ice is stable, arranging a plurality of nodes in a range from the initial low temperature to the target low temperature, adjusting a product thermal control system to enable the temperature of the pure water ice to reach one node, keeping for a period of time, transferring to the next node, and recording the time variation of the temperature and the indication number of the electronic balance;
(4C) Taking readings of a front electronic balance and a rear electronic balance in each temperature stable interval as an initial weight and a changed weight respectively, and calculating the sublimation loss rate of the water-containing simulated lunar soil water at different low temperature according to a formula (2);
(4D) Analyzing the calculation result of the water sublimation loss rate, judging whether the influence of the low-temperature on the water sublimation loss rate is obvious, if so, sequentially using the water-containing simulated lunar soil with different water contents and different densities as a sample, and carrying out a test according to the step (4) to obtain the influence of the temperature change of the low-temperature region on the water sublimation loss rate of the water-containing simulated lunar soil with different water contents and different densities; if not, it can be directly concluded that the low temperature of the region has no significant influence on the simulated lunar soil water sublimation loss rate.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. in the application, the basic weighing measurement method is used, the principle is simple, the influence of the change of two environmental factors of vacuum degree and temperature on the water content simulation lunar soil water sublimation loss rate with different water contents and different compactness can be obtained after the environmental factors and the self characteristic factors of the water content simulation lunar soil are changed reasonably to carry out test and select test data, and support is provided for the in-situ sampling design of the lunar exploration engineering task.
2. In the application, the in-situ test method is adopted to realize the real simulation of the in-situ sampling environment of the lunar surface of the sample, and the normal working environment is provided for the test equipment through the designed and developed electronic balance thermal control system, so that the accuracy of the measured data is ensured, and the measurement precision reaches 10-6 g/mi.
Drawings
FIG. 1 illustrates a schematic diagram of a testing system provided in accordance with an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating an explosive structure of an electronic balance spread loading device according to an embodiment of the invention;
fig. 3 shows a flow chart of an experiment provided according to an embodiment of the present invention.
Illustration of the drawings:
1. a sample; 2. an electronic balance extension carrying device; 3. a radiation shield; 4. a thermally controlled capsule; 5. a thin film heater; 6. an electronic balance; 7. a heat insulating column; 8. a vibration isolation plate; 9. an infrared heating cage; 10. mounting a platform; 11. low-temperature heat sink; 12. a vacuum thermal simulation chamber; 13. a second temperature controller; 14. a second program control power supply; 15. a second temperature sensor; 16. a first temperature controller; 17. a first program control power supply; 18. a first temperature sensor; 19. a direct current power supply; 20. an electronic balance monitoring control system; 21. a pressure control system; 22. a tray; 23. a connecting bolt; 24. an upper connecting flange; 25. a heat insulation ring; 26. a heat insulating sheet; 27. and a lower connecting flange.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution:
the utility model provides a test method is measured to moisture simulation lunar soil water sublimation loss rate normal position, is provided with the vacuum analogue means of sample 1 experiment real-time weight data in test system for the real-time weight data of sample 1 in each experimental operating mode of record different characteristics, simultaneously, in simulation lunar surface environment, utilizes weighing method measurement to calculate the moisture lunar soil water sublimation loss rate, and obtains the influence of different low temperature district, vacuum, moisture content and closely knit degree factor to moisture lunar soil water sublimation rate, specifically includes following steps:
(1) Preparing samples 1, including pure water ice and a plurality of groups of water-containing simulated lunar soil with different water contents and different compactness, and embedding a temperature sensor in each sample 1;
(2) Calibrating errors of the vacuum simulation device;
(3) Carrying out experimental study on the influence of the vacuum degree on the sublimation loss rate of the water-containing simulated lunar soil water;
(4) And carrying out experimental study on the influence of low temperature on the simulated lunar soil water sublimation rate.
Specifically, as shown in fig. 1, the test system includes 1 vacuum thermal simulation chamber 12, 1 low- temperature heat sink 11, 1 mounting platform 10, 1 vibration isolation plate 8, 1 set of heat isolation column 7, 1 infrared heating cage 9, 2 electronic balances 6, 2 electronic balance extension loading devices 2, 2 thermal control cabins 4, 1 radiation protection cover 3, 2 sets of thin film heaters 5, 2 sets of temperature sensors (a set of temperature sensors 18 and B set of temperature sensors 15), 2 sets of temperature controllers (a set of temperature controllers 16 and B set of temperature controllers 13), 2 sets of programmable power supplies (a set of programmable power supplies 17 and B set of temperature controllers 14), 1 set of pressure control system 21, 1 set of electronic balance monitoring control system 20,1 direct current power supply 19; the electronic balance extension loading device 2 consists of 1 upper connecting flange 24, 1 lower connecting flange 27, 2 groups of heat insulation rings 25, 1 heat insulation sheet 26, 1 group of connecting bolts 23 and 1 tray 22.
Before a test, adhering 5 inner surfaces of a bottom frame and a lower surface of a cover plate of 2 thermal control cabins 4 with a film heater 5, adhering an A group of temperature sensors 5 on each inner surface of the thermal control cabins 4, adhering 2 sensors on each surface, taking one sensor as a backup, coating 6 outer surfaces of the thermal control cabins 4 with a multilayer heat insulation assembly, coating 5 outer surfaces of a radiation shield 3 with the multilayer heat insulation assembly, respectively substituting and extending measurement and control data lines and power lines of an electronic balance 6 with high and low temperature resistant tetrafluoro electric wires to adapt to the environment in a vacuum thermal simulation chamber 12, ensuring the normal work of the electronic balance 6, and using a cut part for connection outside the vacuum thermal simulation chamber 12;
as shown in fig. 1, in the test preparation stage, a vibration isolation plate 8 is placed on an installation platform 10 in a vacuum thermal simulation chamber 12, a bottom frame of a thermal control cabin 4 is fixedly installed on the vibration isolation plate 8 through a thermal insulation column 7, an electronic balance 6 is horizontally placed in the bottom frame of the thermal control cabin 4, the electronic balance 6 is started, a lower connecting flange 27 of an electronic balance extension carrying device 2 is in butt joint with a weight sensor interface of the electronic balance 6, then a group of thermal insulation rings 25, a thermal insulation sheet 26, another group of thermal insulation rings 25 and an upper connecting flange 24 are in butt joint with the lower connecting flange 27 through a group of connecting bolts 23 and fixed, a cover plate of the thermal control cabin 4 is fastened, according to the mode, after the two sets of test devices are installed, the radiation protection cover 3 covers the two thermal control cabins 4 and is fastened on the vibration isolation plate 8, a tray 22 interface of the electronic balance extension carrying device 2 sequentially penetrates through circular holes in the thermal protection cover 3, circular holes in the cover plate of the thermal control cabin 4 and an upper connecting flange 24 interface of the electronic balance extension carrying device 2, a data line of the electronic balance 6, a power supply line and a power supply line of the thermal control cabin 4 and a thermal control heater, and a working environment simulation sensor are implemented, and a thermal control module 6 is implemented;
when the test is carried out, the test is carried out according to a test flow chart shown in fig. 3, and the method specifically comprises the following steps:
(1) Sample 1 was prepared according to the specific requirements of the test: the method mainly comprises pure water ice and a plurality of groups of water-containing simulated lunar soil with different water contents and different compactness, a group B of temperature sensors II 15 are pre-embedded in a sample 1, 3 sensors are pre-embedded in each sample 1, the sensors are respectively at the center position of the sample, and the inner wall and the outer wall of a sample box, and the prepared sample 1 is stored in a refrigerator; then taking out the required sample 1, storing the sample 1, placing the sample 1 in the tray 22 of the two electronic balance extension carrying devices 2, covering the infrared heating cage 9, and adjusting the position of the infrared heating cage 9 to enable the two samples 1 to be positioned at the symmetrical positions of the infrared heating cage 9 so as to ensure that the heat radiation environments of the samples 1 are consistent;
(2) Carrying out error calibration on the vacuum simulation device: replacing the sample 1 with two metal counterweights, placing the sample in a tray 22 of an electronic balance extended loading device 2 for testing, closing a door of a vacuum thermal simulation chamber 12, and starting a pressure control system 21 to enable the vacuum degree to reach 1X10 -5 Pa, simultaneously starting a low-temperature heat sink 11 to establish a low-temperature background, setting a target temperature of a first 16 group of temperature controllers to be 20 ℃, enabling the temperatures of the two thermal control cabins 4 to be stabilized at 20 ℃, recording the variation situation of readings in the balance 5h along with time after the temperatures are stabilized, and calculating the fluctuation rate of readings of the two electronic balances 6 according to a formula (1);
(3) Carrying out experimental study on influence of vacuum degree on water content simulation lunar soil water sublimation loss rate:
(3A) Firstly, pure water ice is used for testing, the door of the vacuum thermal simulation chamber 12 is closed, and the pressure control system 21 is started to enable the vacuum degree to reach 1X10 -5 Pa, simultaneously starting a low-temperature heat sink 11 to establish a low-temperature background, setting a first 16 target temperature of a group A of temperature controllers to be 20 ℃, enabling the temperatures of the two thermal control cabins 4 to be stable at 20 ℃, and then adjusting a product thermal control system to keep the temperature of pure water ice at-100 ℃;
(3B) After the temperature of pure water ice is stable, pressure control system is adjusted21, gradually reducing the vacuum degree in the vacuum thermal simulation chamber 12 until the vacuum degree is 1X10 -2 Pa, recording the change of the vacuum degree and the reading of the electronic balance 6 along with time;
(3C) Respectively taking the vacuum degree to be 10 -5 、10 -2 Readings of the front electronic balance 6 and the rear electronic balance 6 in the magnitude interval are respectively used as an initial weight and a changed weight, and the water-containing simulated lunar soil water sublimation loss rate under different vacuum degrees is calculated according to a formula (2);
wherein s is the sublimation loss rate of water, m 0 、m t Respectively the initial weight and the changed weight of the sample 1 in the delta t time interval, and V is the surface area of the sample 1 during manufacturing;
(3D) Analyzing the calculation result of the water sublimation loss rate, judging whether the influence of the vacuum degree on the water sublimation loss rate is obvious, if so, sequentially using the water-containing simulated lunar soil with different water contents and different compactness as a sample 1, and carrying out a test according to the step (3) to obtain the influence of the change of the vacuum degree on the water sublimation loss rate of the water-containing simulated lunar soil with different water contents and different compactness; if not, the conclusion can be directly drawn, and the vacuum degree has no obvious influence on the sublimation loss rate of the simulated lunar soil water;
(4) Carrying out a test study of the influence of low temperature on the simulated lunar soil water sublimation rate:
(4A) Firstly, pure water ice is used for testing, the door of the vacuum thermal simulation chamber 12 is closed, and the pressure control system 21 is started to enable the vacuum degree to reach 1X10 -5 Pa, simultaneously starting a low-temperature heat sink 11 to establish a low-temperature background, adjusting a thermal control system of the electronic balance, setting the target temperature of the group A of thermostats to be 20 ℃ so that the temperatures of the two thermal control cabins 4 are both stabilized at 20 ℃, then setting the target temperature of the group B of thermostats to be-120 ℃ so that the temperature of pure water ice is reduced to-120 ℃;
(4B) Keeping the pure water ice temperature for 2h after the pure water ice temperature is stable, then heating up to-70 ℃ by taking 10 ℃ as a temperature step, keeping for 2h after each temperature step is stable, and recording the temperature and the time change condition of the electronic balance indication;
(4C) Taking readings of the front electronic balance 6 and the rear electronic balance 6 which are kept at the respective temperatures for 2 hours as initial weights and changed weights respectively, and calculating the sublimation loss rate of the pure water and the ice water at different low temperature according to a formula (2);
(4D) Analyzing the calculation result of the water sublimation loss rate, judging whether the influence of the low-temperature on the water sublimation loss rate is obvious, if so, sequentially using the water-containing simulated lunar soil with different water contents and different densities as a sample 1, and carrying out a test according to the step (4) to obtain the influence of the temperature change of the low-temperature region on the water sublimation loss rate of the water-containing simulated lunar soil with different water contents and different densities; if not obvious, the conclusion can be directly drawn that the low temperature of the area has no obvious influence on the simulated lunar soil water sublimation loss rate.
The previous description of the embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The in-situ measurement test method for the water-containing simulated lunar soil water sublimation loss rate is characterized in that a vacuum simulation device for testing real-time weight data of a sample (1) is arranged in a test system and used for recording the real-time weight data of the sample (1) with different characteristics in each test working condition, meanwhile, in a simulated lunar surface environment, the water-containing lunar soil water sublimation loss rate is measured and calculated by using a weighing method, and the influence of different low-temperature regions, vacuum degrees, water contents and compactness factors on the water-containing lunar soil water sublimation rate is obtained, and the in-situ measurement test method specifically comprises the following steps:
(1) Preparing samples (1), including pure water ice and a plurality of groups of water-containing simulated lunar soils with different water contents and different compactness, and embedding temperature sensors in each sample (1) in advance respectively;
(2) Calibrating errors of the vacuum simulation device;
(3) Carrying out experimental study on the influence of the vacuum degree on the sublimation loss rate of the water-containing simulated lunar soil water;
(4) And carrying out experimental study on the influence of low temperature on the simulated lunar soil water sublimation rate.
2. The in-situ measurement test method for the sublimation loss rate of water containing simulated lunar soil water as claimed in claim 1, wherein the vacuum simulation device comprises: the 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.
3. The in-situ measurement test method for the sublimation loss rate of water-containing simulated lunar soil water according to claim 2, characterized in that an electronic balance thermal control system comprises a thermal control cabin (4), a film heater (5), a radiation shield (3), a first temperature sensor (18), a first program-controlled power supply (17) and a first temperature controller (16), the sample (1) thermal control system comprises an infrared heating cage (9), a second temperature sensor (15), a second program-controlled power supply (14) and a second temperature controller (13), and the electronic balance extended object carrying device (2) comprises an upper connecting flange (24), a lower connecting flange (27), a heat insulation ring (25), a heat insulation sheet (26), a connecting bolt (23) and a tray (22).
4. The in-situ measurement test method for the sublimation loss rate of the water-containing simulated lunar soil water as claimed in claim 1, wherein the method for calibrating the error of the vacuum simulation device in the step (2) specifically comprises the following steps:
(2A) Replace sample (1) with two metal counter weights, place on the electronic balance in the vacuum thermal simulation room, start pressure control system and make vacuum reach the highest value, low temperature heat sink establishes the low temperature background simultaneously, adjusts electronic balance thermal control system, makes two thermal control cabin temperature all stabilize at certain fixed temperature in electronic balance normal operating temperature region, records the registration of balance in a period and the condition of change along with time, obtains under this temperature according to the formula from this, two electronic balance registration fluctuation rates:
wherein l is the index fluctuation rate of the electronic balance, m max 、m min The maximum value and the minimum value of the readings of the electronic balance in time are respectively;
(2B) When the measured and calculated water sublimation rate is smaller than the indication fluctuation value of the electronic balance in the formal test, the value cannot be used as the test result.
5. The in-situ measurement test method for the sublimation loss rate of the water-containing simulated lunar soil water as claimed in claim 1, wherein the test research method for the influence of the vacuum degree on the sublimation loss rate of the water-containing simulated lunar soil water in the step (3) specifically comprises the following steps:
(3A) Firstly, testing with pure water ice, starting a pressure control system to enable the vacuum degree to reach a highest value, establishing a low-temperature background by a low-temperature heat sink, adjusting a thermal control system of an electronic balance to enable the temperature of a thermal control cabin to be stabilized at the same temperature corresponding to the step (2), and then adjusting a product thermal control system to enable the temperature of the pure water ice to be kept at a certain fixed temperature in a low-temperature area;
(3B) After the temperature of the pure water ice is stable, adjusting a pressure control system to gradually reduce the vacuum degree in the vacuum thermal simulation chamber until the target vacuum degree is reached, and recording the time-varying conditions of the vacuum degree and the readings of an electronic balance;
(3C) Taking readings of a front electronic balance and a rear electronic balance in each vacuum degree stable interval as an initial weight and a changed weight respectively, and calculating the water-containing simulated lunar soil water sublimation loss rate under different vacuum degrees according to a formula (2);
wherein s is the sublimation loss rate of water, m 0 、m t Respectively, the initial weight of the sample (1) in the time interval of delta tAnd the changed weight, V is the surface area of the sample (1) at the time of its preparation;
(3D) Analyzing the calculation result of the water sublimation loss rate, judging whether the influence of the vacuum degree on the water sublimation loss rate is obvious, if so, sequentially using the water-containing simulated lunar soil with different water contents and different compactness as a sample (1), and carrying out a test according to the step (3) to obtain the influence of the change of the vacuum degree on the water sublimation loss rate of the water-containing simulated lunar soil with different water contents and different compactness; if not obvious, the conclusion can be directly drawn that the vacuum degree has no obvious influence on the sublimation loss rate of the simulated lunar soil water.
6. The in-situ measurement test method for the sublimation loss rate of the water-containing simulated lunar soil water as claimed in claim 1, wherein the method for carrying out the test research on the influence of the low temperature on the sublimation rate of the simulated lunar soil water in the step (4) specifically comprises the following steps:
(4A) Firstly, testing with pure water ice, starting a pressure control system to enable the vacuum degree to reach the highest value, establishing a low-temperature background by a low-temperature heat sink, adjusting a thermal control system of the electronic balance to enable the temperature of the thermal control cabin to be stabilized at the same temperature corresponding to the step (2), and then adjusting a product thermal control system to enable the temperature of the pure water ice to be reduced to the initial low temperature;
(4B) After the temperature of the pure water ice is stable, arranging a plurality of nodes in a range from the initial low temperature to the target low temperature, adjusting a product thermal control system to enable the temperature of the pure water ice to reach one node, keeping for a period of time, transferring to the next node, and recording the time variation of the temperature and the indication number of the electronic balance;
(4C) Taking readings of a front electronic balance and a rear electronic balance in each temperature stable interval as an initial weight and a changed weight respectively, and calculating the sublimation loss rate of the water-containing simulated lunar soil water at different low temperature according to a formula (2);
(4D) Analyzing the calculation result of the water sublimation loss rate, judging whether the influence of the low-temperature on the water sublimation loss rate is obvious, if so, sequentially using simulated lunar soil containing water with different water contents and different compactness as a sample (1), and carrying out a test according to the step (4) to obtain the influence of the temperature change of a low-temperature region on the water sublimation loss rate of the simulated lunar soil containing water with different water contents and different compactness; if not obvious, the conclusion can be directly drawn that the low temperature of the area has no obvious influence on the simulated lunar soil water sublimation loss rate.
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