1. A lunar soil reflection spectrum measuring device under a deep low temperature environment is simulated, which is characterized by comprising a deep low temperature vacuum container (100); the inside of the deep low-temperature vacuum container (100) is provided with a spectral measurement device (200) and an illumination light source (210), and the outside is provided with a receiving assembly; the spectral measurement equipment (200) is positioned in a heat-preserving and pressure-maintaining cabin (220); the cabin body (210) is provided with an observation window corresponding to the spectrum measuring equipment (200); the illumination light source (210) is installed outside the cabin (220) at the observation window.

2. The simulated lunar soil reflection spectrum measuring device in the cryogenic environment according to claim 1, wherein the receiving device comprises an upper computer (300) and a temperature collecting device (310); the upper computer (300) is electrically connected with the spectrum measuring equipment (200) and the illumination light source (210).

3. The simulated lunar soil reflection spectrum measuring device under cryogenic environment according to claim 2, wherein a tray (400) is further arranged in the cryogenic vacuum container (100); the tray (400) is positioned below the observation window and used for containing simulated lunar soil; and a temperature sensor (410) electrically connected with the temperature acquisition equipment (310) is arranged in the simulated lunar soil.

4. The simulated lunar soil reflectance spectrum measuring device under cryogenic environment according to claim 1, wherein the interior of the cryogenic vacuum vessel (100) is 10%^-3Vacuum environment of Pa magnitude, and temperature lower than-250 deg.C.

5. The simulated lunar soil reflection spectrum measuring device under cryogenic environment according to claim 1, wherein the wavelength measuring range of the spectrum measuring apparatus (200) is 380nm-780 nm.

6. The simulated lunar soil reflectance spectroscopy apparatus of claim 1, wherein the observation window has a spectral transmittance of greater than 0.9 at a wavelength range of 380nm to 780nm and is capable of withstanding a pressure differential of at least one atmosphere.

7. A measuring method comprising the simulated lunar soil reflection spectrum measuring device under the cryogenic environment of any one of claims 1 to 6, characterized by comprising the following steps:

a standard reflectivity white board is arranged corresponding to the spectrum measuring equipment (200), and the reflectivity spectrum curve is r₀(λ)；

Under normal temperature and pressure, the illumination light source is turned on to obtain the output signal V of the spectral measurement device (200)₀(λ)；

Placing the simulated lunar soil corresponding to the spectrum measuring equipment (200), wherein the reflectivity spectrum curve is r (lambda);

under the vacuum deep low temperature environment, the illumination light source is started to obtain the output signal V of the spectral measurement equipment (200)₁(λ)；

According to the formula:

V₀(λ)＝E(λ)*r₀(λ)*O(λ)*R(λ)；

V₁(λ)＝E(λ)*r(λ)*O(λ)*R(λ)；

wherein E (λ) is the radiance of the illumination source, O (λ) is the spectral response curve of the observation window and the optical system of the spectral measurement device, and R (λ) is the spectral response curve of the electronic system of the spectral measurement device (200);

therefore, the reflectance spectrum r (λ) of the simulated lunar soil in the deep low temperature environment is:

Background

The detection in the permanent shadow pit on the lunar surface is always a hot spot for lunar surface detection, and people hope to find water resources in the permanent shadow pit. The permanent shadow pit on the surface of the moon can not be illuminated by sunlight, when the shadow pit is detected in situ, a light source is needed to illuminate a detected area, but when an illumination light source and an image acquisition device are designed, the response spectrum of the image acquisition device is needed to be matched with the reflection spectrum of the lunar soil reflection illumination light source in the shadow pit. The temperature of lunar soil in the shadow pit is about-230 ℃ because the lunar soil is never illuminated, and the reflection characteristic of the lunar soil at the temperature is unknown and needs to be measured through a ground test.

At present, the lowest temperature which can be reached by a heat sink of a vacuum low-temperature container refrigerated by liquid nitrogen is-196 ℃, the requirement of reducing simulated lunar soil to-230 ℃ cannot be met, and meanwhile, in a deep low-temperature region, extremely small heat flow can also have great influence on the cooling of a product; the above problems are urgently to be solved.

Disclosure of Invention

In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a simulated lunar soil reflectance spectrum measurement device and method in a cryogenic environment.

In a first aspect, the present application provides a lunar soil reflection spectrum measuring device simulated in a cryogenic environment, comprising a cryogenic vacuum vessel; the inside of the deep low temperature vacuum container is provided with a spectrum measuring device and an illumination light source, and the outside is provided with a receiving assembly; the spectral measurement equipment is positioned in the heat-insulating and pressure-maintaining cabin body; the cabin body is provided with an observation window corresponding to the spectrum measuring equipment; the illumination light source is arranged outside the cabin body and is positioned at the observation window.

Further, the receiving device comprises an upper computer and a temperature acquisition device; the upper computer is electrically connected with the spectrum measuring equipment and the illumination light source.

Further, a tray is also arranged in the deep low-temperature vacuum container; the tray is positioned at the observation window and used for containing the simulated lunar soil; a temperature sensor electrically connected with the temperature acquisition equipment is arranged in the simulated lunar soil.

Further, the interior of the deep low temperature vacuum vessel is 10^-3Vacuum environment of Pa magnitude, and temperature lower than-250 deg.C.

Further, the wavelength measuring range of the spectral measuring device is 380nm-780 nm.

Further, the observation window has a spectral transmittance of greater than 0.9 over a wavelength range of 380nm to 780nm and is capable of withstanding a pressure differential of at least one atmosphere.

In a second aspect, the present application provides a method for measuring lunar soil reflection spectrum under a cryogenic environment, which is characterized by comprising the following steps:

a standard reflectivity white board is arranged corresponding to the spectrum measuring equipment, and the reflectivity spectrum curve is r₀(λ)；

Under normal temperature and pressure, the illumination light source is turned on to obtain the output signal V of the spectral measurement equipment₀(λ)；

Placing the simulated lunar soil corresponding to the spectrum measuring equipment, wherein the reflectivity spectrum curve is r (lambda);

under the vacuum deep low temperature environment, the illumination light source is started to obtain the output signal V of the spectral measurement equipment₁(λ)；

According to the formula:

V₀(λ)＝E(λ)*r₀(λ)*O(λ)*R(λ)；

V₁(λ)＝E(λ)*r(λ)*O(λ)*R(λ)；

wherein E (lambda) is the radiance of the illumination light source, O (lambda) is the spectral response curve of the observation window and the optical system of the spectral measurement equipment, and R (lambda) is the spectral response curve of the electronic system of the spectral measurement equipment;

therefore, the reflectance spectrum r (λ) of the simulated lunar soil in the cryogenic environment is represented as:

the application has the advantages and positive effects that:

this technical scheme is through installing spectral measurement equipment in the heat preservation and pressure maintenance cabin that has the heat protection, can provide normal atmospheric temperature normal pressure operational environment for spectral measurement equipment, and effectively shields the influence of the heat flow that heat preservation and pressure maintenance cabin produced to being surveyed depth low temperature simulation lunar soil, ensures the accuracy of measurement. Furthermore, the technical scheme uses the vacuum low-temperature container with the helium heat sink, and can provide a temperature boundary of-250 ℃, so that the temperature of the simulated lunar soil can be reduced to-230 ℃, the condition in a permanent shadow pit of the lunar surface can be truly simulated, and the reflection spectrum of the simulated lunar soil at the temperature can be effectively acquired.

Drawings

Fig. 1 is a schematic structural diagram of a lunar soil reflection spectrum measurement apparatus and method under a cryogenic environment according to an embodiment of the present disclosure.

The text labels in the figures are represented as: 100-deep low temperature vacuum vessel; 200-a spectroscopic measurement device; 210-an illumination source; 220-a cabin body; 300-an upper computer; 310-temperature acquisition equipment; 400-a tray; 410-temperature sensor.

Detailed Description

The following detailed description of the present application is given for the purpose of enabling those skilled in the art to better understand the technical solutions of the present application, and the description in this section is only exemplary and explanatory, and should not be taken as limiting the scope of the present application in any way.

In a first aspect, referring to fig. 1, the present embodiment provides a lunar soil reflection spectrum measuring apparatus under a cryogenic environment, including a cryogenic vacuum vessel 100; the inside of the vacuum container 100 is provided with a spectrum measuring device 200, an illumination light source 210 and a tray 400, and the outside is provided with an upper computer 300 and a temperature collecting device 310; the upper computer 300 is electrically connected with the spectral measurement device 200 and the illumination light source 210 respectively and is used for remotely controlling the spectral measurement device 200 and the illumination light source 210; the temperature collecting device 310 is electrically connected with a temperature sensor 410, and the temperature sensor 410 is installed in the tray 400.

Preferably, the cryogenic vacuum vessel 100 may provide 10^-3The vacuum environment of Pa magnitude, and the heat sink adopts helium cycle refrigeration, can provide the low temperature boundary below-250 ℃, simultaneously, heat sink surface spraying has the absorption rate to be superior to the thermal control black lacquer of 0.9.

In a preferred embodiment, the spectrum measuring apparatus 200 is located in the heat-preserving and pressure-maintaining cabin 220, and after the thermal protection is performed on the cabin 220, the spectrum measuring apparatus 200 can be ensured to be in a working environment at normal temperature and normal pressure, and can also be used for shielding the influence of heat flow generated by the cabin 220 on the measured depth low-temperature simulated lunar soil.

Preferably, the spectral measuring device 200 is a spectrometer with a measurable wavelength range covering 380nm to 780nm, and can be remotely controlled by the upper computer 300.

Preferably, the cabin 220 is provided with an observation window corresponding to the spectrum measuring device 200; the observation window is plated with an antireflection film, the spectral transmittance in the wavelength range of 380nm-780nm is more than 0.9, and the observation window can bear the pressure difference of 1 atmosphere.

Preferably, the cabin 220 is integrally covered with 10 units of multi-layer heat insulation assemblies except for the observation window, and an electric heater for controlling temperature is adhered to the outer wall; the control cables of the spectrum measuring apparatus 200 are led out to the outside of the cabin 220 through the flange of the cabin 220, the cables inside the cabin 220 use normal temperature cables, and the cables outside the cabin 220 use low temperature cables.

In a preferred embodiment, the illumination source 210 is mounted on the exterior of the cabin 220 on one side of the viewing window; an electric heater is pasted on the installation surface of the illumination light source 210, and a temperature measuring point is pasted on the light source surface and used for controlling the temperature of the illumination light source 210 so as to ensure that the illumination light source 210 can be normally turned on and off.

Preferably, the irradiation spectrum range of the illumination light source 210 covers the wavelength range of 380nm to 780nm, and the performance is stable.

In a preferred embodiment, the tray 400 is made of metal, and is used as a container for simulating lunar soil and is placed in contact with the heat sink of the cryogenic vacuum container 100; the temperature sensor 410 is disposed in the simulated lunar soil without being in direct contact with the tray 400, and is used to measure the temperature of the simulated lunar soil.

In a second aspect, the present application provides a measuring method of a lunar soil reflection spectrum measuring apparatus simulated under a low temperature environment, comprising the following steps:

placing a standard reflectivity white board at the simulated lunar soil, wherein the reflectivity spectrum curve is r₀(λ)；

Under normal temperature and pressure, the illumination light source is turned on to obtain the output signal V of the spectral measurement equipment₀(λ)；

Placing the simulated lunar soil corresponding to the spectrum measuring equipment 200, wherein the reflectivity spectrum curve is r (lambda);

under the vacuum deep low temperature environment, the illumination light source is started to obtain the output signal V of the spectral measurement equipment₁(λ)；

According to the formula:

V₀(λ)＝E(λ)*r₀(λ)*O(λ)*R(λ)；

V₁(λ)＝E(λ)*r(λ)*O(λ)*R(λ)；

wherein E (lambda) is the radiance of the illumination light source, O (lambda) is the spectral response curve of the observation window and the optical system of the spectral measurement equipment, and R (lambda) is the spectral response curve of the electronic system of the spectral measurement equipment;

therefore, the reflectance spectrum r (λ) of the simulated lunar soil in the cryogenic environment is represented as:

the principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention in other contexts without modification may be viewed as within the scope of the present application.