Disclosure of Invention
The invention provides a testing device for extreme low-temperature physical properties of lunar soil water ice, aiming at solving the technical problem that no experimental device capable of realizing an extreme low-temperature vacuum environment of a moon exists in the prior art.
The invention provides a testing device for extreme low-temperature physical properties of lunar soil water ice, which comprises a refrigerating system, a vacuum system and a vacuum low-temperature experiment chamber, wherein the vacuum low-temperature experiment chamber is positioned in the vacuum system, and the refrigerating system is connected with the vacuum low-temperature experiment chamber and used for refrigerating the vacuum low-temperature experiment chamber;
the refrigeration system mainly comprises a low-temperature refrigerator and a multi-stage cold head, wherein the low-temperature refrigerator is connected with the vacuum low-temperature experiment chamber through the multi-stage cold head;
the vacuum low-temperature experiment cabin comprises an experiment cabin body, a cold guide sample table, a sealed sample box and a temperature control heating sheet, wherein the cold guide sample table is placed in the experiment cabin body, the cold guide sample table is connected with a multi-stage cold head, the sealed sample box and the temperature control heating sheet are placed on the cold guide sample table, a sensor to be tested is arranged on the temperature control heating sheet, the sealed sample box is divided into a plurality of independent units, and a water ice sample and a sensor to be tested are placed in each independent unit;
the vacuum system comprises a vacuum cover and a cold screen, wherein the cold screen is arranged in the vacuum cover, an experiment cabin body is arranged in the cold screen, and a sensor measuring interface is arranged on the vacuum cover.
Preferably, a base is connected below the vacuum cover through a vacuum cover flange.
Preferably, the outer surfaces of the cold screen and the vacuum low-temperature experiment cabin are subjected to gold plating treatment, and the inner surfaces of the cold screen and the vacuum low-temperature experiment cabin are coated with heat sink black paint.
Preferably, the multistage cold head cools down step by step, finally transmits extreme low temperature to the vacuum low temperature experiment cabin.
Preferably, a cold conducting copper block is arranged below the cold conducting sample table and connected with the multistage cold head.
The testing device for extreme low-temperature physical properties of the lunar soil water ice has the beneficial effects that:
1. the sealed sample box comprises five layers of independent units, so that position decoupling and distribution decoupling are facilitated.
2. The invention can simulate the harsh lunar environment, is a first time of testing the sensing device for water ice detection in China, fills the blank of water ice detection in China, and has great significance for pursuing the international space exploration level in China.
Detailed Description
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:
the first embodiment is as follows: the present embodiment is explained with reference to fig. 1-2. The testing device for extreme low-temperature physical properties of lunar soil water ice in the embodiment comprises a refrigerating system, a vacuum system and a vacuum low-temperature experiment chamber, wherein the vacuum low-temperature experiment chamber is positioned in the vacuum system, the refrigerating system is connected with the vacuum low-temperature experiment chamber and used for refrigerating the vacuum low-temperature experiment chamber, and a thermal control system is positioned outside the vacuum low-temperature experiment chamber;
the refrigerating system mainly comprises a low-temperature refrigerator 6 and a multi-stage cold head 7, wherein the low-temperature refrigerator 6 is connected with the vacuum low-temperature experiment chamber through the multi-stage cold head 7;
the vacuum low-temperature experiment chamber comprises an experiment chamber body, a cold guide sample table, a sealed sample box 3 and a temperature control heating sheet 10, wherein the cold guide sample table is placed in the experiment chamber body, the cold guide sample table is connected with a multistage cold head 7, the sealed sample box 3 and the temperature control heating sheet 10 are placed on the cold guide sample table, a sensor 11 to be tested is arranged on the temperature control heating sheet 10, the sealed sample box 3 is divided into a plurality of independent units, and a water ice sample and the sensor 11 to be tested are placed in each independent unit;
the vacuum system comprises a vacuum cover 12 and a cold screen 1, wherein the cold screen 1 is arranged in the vacuum cover 12, an experimental cabin body is arranged in the cold screen 1, and a sensor measuring interface is arranged on the vacuum cover 12.
A base 5 is connected below the vacuum cover 12 through a vacuum cover flange 8.
The measured sensor 11 can be replaced by different sensors according to different experiments.
The multistage cold head 7 cools down step by step, and finally extremely low temperature is transmitted to the vacuum low temperature experiment cabin.
And a cold guide copper block 4 is arranged below the cold guide sample table, and the cold guide copper block 4 is connected with a multistage cold head 7.
The outer surfaces of the cold screen 1 and the vacuum low-temperature experiment chamber are plated with gold to reduce heat leakage, the inner surfaces of the cold screen 1 are coated with heat sink black paint, and the cold screen 1 is used for keeping vacuum and low temperature.
Wherein, the inside of the upper vacuum hood 2 is a cold shield 1, and the inner side of the cold shield 1 is an experiment chamber 10. The inner and outer layer mechanisms are adopted to simulate an extremely low temperature environment as much as possible, wherein the thermodynamic temperature in the cold shield 1 can reach 40K, and the thermodynamic temperature in the hot vacuum chamber can reach 50K. The junction of vacuum cup 2 is provided with the sealing ring, and the effect of vacuum cup 2 and sealing ring is for keeping the condition of vacuum, and vacuum cup 2 links to each other with the molecular pump, can be with the air in the extraction vacuum cup 2 when the experiment begins, and vacuum cup 2 inside can reach certain vacuum degree when the guarantee experiment.
The sample and the detected sensing device required by the experiment are placed on the cold guide sample table, the cold guide sample table is characterized in that the cold guide sample table is connected with a cold guide copper block 9, the cold guide copper block 9 is connected with a multistage cold head 7, in order to ensure the working efficiency, each device is tightly attached to the cold guide sample table, and meanwhile, the instrument is connected with the experimental device through a sensor measurer interface 4, so that the temperature of each cabin can be monitored in real time.
In order to verify the performance of the measured sensor 11, two types of experiments need to be completed, namely the experiment for directly verifying the tolerance of the sensor in a vacuum, low-temperature and anhydrous environment, and the experiment for verifying the tolerance of an instrument in lunar soil with different water contents.
In order to verify the performance of the sensor 11 under different conditions, a sample library is established, lunar soil water ice samples with different water contents and mean values of compactness are configured, low-temperature freezing treatment is performed, then a calibrated sensor device is used for performing comprehensive physical property test, and the water contents, the freezing temperature and the compactness are continuously changed for performing the test, so that the mapping relation between the temperature, the water contents, the compactness and the comprehensive physical property can be obtained.
The sealed sample box 3 is divided into five independent units, and a water ice sample with known comprehensive physical properties and a calibrated sensing device are placed on each layer so as to carry out position decoupling and distribution decoupling. The tested sensor 11 is kept in full contact with the water ice sample during the experiment, and the performance of the sensing device in the extreme environment can be judged whether to meet the index or not by comparing and analyzing the measured data and the known physical property parameters of the sample after the experiment is finished.
The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail. It should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the present invention, and that the reasonable combination of the features described in the above-mentioned embodiments can be made, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.