In-situ exploration-while-drilling device and method for lunar resources

Abstract

The invention discloses a lunar resource in-situ exploration-while-drilling device and method. The lunar resource in-situ exploration-while-drilling device is composed of a spiral drilling tool, an illumination light source module, a polarization spectrum detection module and a dual-channel spectrum measurement module. The drilling tool drill rod is of a hollow structure. Light emitted by the illumination light source module is collimated and depolarized to form unpolarized parallel light to irradiate lunar soil on the side wall of the drill hole, and the polarization spectrum measurement probe collects reflected light of the lunar soil; the reflected light is collimated by a front collimator objective of the probe and then sequentially passes through a spectrum modulation unit consisting of an achromatic 1 / 4 wave plate, a multi-stage wave plate, a beam splitter prism and two polaroids of which the light transmission directions are vertical to each other, and two orthogonal light beams are formed, so that polarization information of the reflected light is modulated in a spectrum dimension; demodulating the modulated spectrum to obtain the spectrum and polarization information of the lunar soil reflected light; and the resource distribution and content and the physical characteristics of the original lunar soil are inversed by using the polarization spectrum characteristics of the lunar soil. According to the invention, in-situ exploration of lunar subsurface depth profile mineral resources can be realized.

Description

Technical Field

[0001] The present invention belongs to the field of deep space resource exploration, and particularly relates to a device and method for in-situ exploration of lunar resources while drilling. The device and method are used for in-situ exploration of the distribution of resources in the depth of the lunar subsurface profile by using the polarization spectral characteristics of lunar soil. Background Art

[0002] The moon is the celestial body closest to the earth, and its surface contains rich mineral resources. The development of lunar resources will not only provide a material basis and supply base for lunar and deep space exploration, but also be one of the important means to solve the problem of depletion of earth's resources, supporting the sustainable development of mankind in the future. Lunar resource exploration is the first step in resource development. The types and abundances of mineral resources in lunar soil play a guiding role in studying the total amount of resources, resource extraction site selection and equipment development, and also provide important original data for mankind to understand lunar evolution and the mechanism of lunar resource occurrence; the physical properties such as particle size and density of lunar soil play an indicative role in deducing the spatial weathering process of lunar soil. Obtaining these information is also a prerequisite for subsequent large-scale lunar base construction.

[0003] At present, hyperspectral technology is mainly used for lunar resource exploration. Since the mineral lattice absorbs the energy of specific bands of incident light, the continuous spectral curve recorded by hyperspectral can reflect the absorption characteristics of the mineral reflection spectrum. Using this characteristic spectrum, the mineral composition of lunar soil can be identified. Currently, remote sensing detection and in-situ detection are two main lunar resource exploration methods. Lunar exploration missions at home and abroad have all carried spectral measurement equipment in the visible to near-infrared bands, such as the UVVIS / NIR multispectral camera of the US Clementine, the M 3 spectrometer of India's Chandrayaan-1, the interferometric imaging spectrometer of China's Chang'e-1, and the infrared imaging spectrometer on the Chang'e-4 / 5 rovers, etc.

[0004] Although remote sensing detection and in-situ detection have been widely used in lunar exploration, the existing technology focuses on the exploration of lunar surface resources and it is difficult to obtain the original distribution and state of resources in the measured depth profile. Therefore, the current lunar resource abundance is mostly estimated based on lunar surface detection data, which is relatively rough. Especially for some high-value resources, such as lunar helium-3, ilmenite and other resources, during the long geological evolution of the moon and the random impact of meteorites, the surface lunar soil will be stirred to a depth of several meters. However, the current information on the depth profile distribution of lunar resources is missing, resulting in difficulty in determining the tunneling depth of future resource extraction equipment.

[0005] At present, the detection of lunar profile information usually adopts the method of drilling and returning. The implementation of the entire mission project is complex, the number of sampling points is small, the cycle is long, and the drill does not have the function of analyzing the internal lunar soil composition during the drilling process. The in-situ particle layer sequence structure, void ratio and other characteristics of the returned earth soil are also damaged and it is difficult to restore the original physical characteristics on the ground. At the same time, it is also difficult to accurately invert the physical characteristics of lunar soil through single spectral measurement, such as parameters like particle size distribution and bulk density. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a device and method for in-situ exploration of lunar resources while drilling. The polarization spectral characteristics of lunar soil reflected light are sensitive to the chemical and physical characteristics of particles. Therefore, during the implementation of the traditional drilling process, if the polarization and spectral characteristics of the lunar soil in the profile can be scanned and detected in real time synchronously, the exploration of the depth distribution of lunar resources and the in-situ measurement of the physical characteristics of lunar soil can be realized. This will enable humans to more comprehensively understand the resource distribution gradient, accurately estimate the total amount of lunar resources, provide important guidance for the mining depth of lunar resource mining equipment, and at the same time obtain the internal geological information at the sampling point, providing reference data for the landing point and base construction site selection of future lunar missions. Therefore, the present invention can measure the polarization spectral characteristics of lunar soil reflected light at different depths during the drilling process of the drill, and then invert the profile resource distribution and content, and at the same time obtain the physical characteristic information of the lunar soil in the profile, providing necessary scientific data support for the implementation of future lunar resource development projects and lunar base construction.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A device for in-situ exploration of lunar resources while drilling includes a spiral drill, an illumination light source module, a polarization spectral detection module, and a dual-channel spectral measurement module; the internal optical fiber of the spiral drill is connected to the optical fibers of the external illumination light source module and the dual-channel spectral measurement module through an optical fiber rotary connector; the light emitted by the illumination light source module forms non-polarized parallel light after collimation and depolarization and irradiates the lunar soil on the side wall of the drill hole, and the polarization spectral measurement probe collects the reflected light of the lunar soil; the reflected light is collimated by the pre-collimation objective lens of the probe and then passes through a achromatic quarter-wave plate, a multi-stage wave plate, a beam splitting prism, and a polarization spectral modulation unit composed of a first polarizer and a second polarizer with mutually perpendicular transmission directions in sequence, and forms two orthogonal light beams, realizing the modulation of the polarization information of the reflected light in the spectral dimension; the two orthogonal light beams are coupled to the two slits of the dual-channel spectral measurement module through polarization-maintaining transmission optical fibers, and after being collimated by the internal mirror of the spectral measurement module, dispersed by a grating, and spectrally imaged, the two modulated spectra are recorded by a detector; then the modulated spectra are demodulated to obtain the spectral and polarization information of the lunar soil reflected light; the resource distribution and content, as well as the physical characteristics of the original lunar soil, are inverted by using the polarization spectral characteristics of the lunar soil.

[0009] The present invention also provides a method for demodulating detection data based on the in-situ exploration device for lunar resources while drilling. By demodulating the modulated spectrum received by the dual-spectral measurement module, the broadband polarization information and hyperspectral information of the lunar soil reflected light are obtained simultaneously, and then the profile resource distribution and lunar soil physical properties are inverted using this information.

[0010] Advantages:

[0011] 1. The present invention integrates an illumination optical path and a polarization spectrum measurement probe inside the drill tool, uses optical fibers to transmit the illumination light and the polarization modulated optical signal of the lunar soil reflected light, and connects the external illumination light source module and the dual-channel spectrum measurement module outside the drill pipe to the polarization spectrum measurement module inside the drill pipe through an optical fiber rotary connector, realizing a high degree of integration of the drill tool and the measurement system. Compared with the traditional drilling process, the measurement of the polarization spectrum characteristics of the lunar soil can be completed synchronously during the drilling process of the drill tool, and the profile resource distribution and lunar soil physical properties can be obtained in-situ.

[0012] 2. The polarization spectrum measurement probe of the present invention adopts a spectral modulation polarization measurement method. Compared with the traditional time-sharing polarization detection and amplitude division polarization detection, it can detect the continuous spectrum and polarization information of the incident light simultaneously in one exposure, is suitable for snapshot measurement during the movement of the drill pipe, and has a more compact structure, and can make full use of the internal space of the drill pipe for integration.

[0013] 3. The polarization spectrum measurement probe of the present invention uses a beam splitting prism and two orthogonal polarizers to obtain the modulated spectra of the orthogonal channels, and uses the two orthogonal modulated spectra to demodulate the continuous spectrum information and polarization information of the incident light. Compared with the traditional single-channel polarization spectrum modulation measurement method, it can overcome the problem of low resolution of the restored spectrum, and the resolution of the demodulated radiation spectrum is consistent with the original spectrum resolution of the spectrum measurement module; at the same time, multi-sampling point fitting is used for polarization demodulation, which is less affected by noise and has higher polarization demodulation accuracy. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the in-situ exploration device for lunar resources while drilling of the present invention.

[0015] Figure 2 It is a schematic structural diagram of the polarization spectrum measurement module.

[0016] Among them, the reference numerals are: auger 1, illumination light source module 2, polarization spectrum detection module 3, dual-channel spectrum measurement module 4, drill pipe 1-1, fiber optic rotary connector 1-2, polarization-maintaining transmission optical fiber 1-3, illumination optical fiber 1-4, sapphire transparent window 1-5, light source controller 2-1, broadband illumination light source 2-2, illumination light source head 3-1, polarization spectrum measurement probe 3-2, detection target 3-3, collimating lens 3-1-1, depolarizer 3-1-2, front collimating objective lens 3-2-1, achromatic quarter-wave plate 3-2-2, multi-stage wave plate 3-2-3, beam splitting prism 3-2-4, first polarizer 3-2-5, second polarizer 3-2-6, right-angle reflecting prism 3-2-7, imaging lens 3-2-8, spectrometer double slit 4-1, collimator 4-2, focusing lens 4-3, dispersion element 4-4, detector 4-5. Detailed implementation manners

[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0018] Based on the above, the existing exploration of lunar subsurface profile resources is mainly by drilling, without in-situ exploration function. Polarization spectrum detection is a non-destructive and effective resource exploration method. If the polarization spectrum characteristics of the lunar soil on the side wall of the borehole are synchronously scanned and observed during the drilling process, the in-situ acquisition of information such as the resource content at different depths and the original physical properties of the lunar soil can be realized.

[0019] Traditional polarization spectrum measurement methods are mainly time-division polarization measurement and amplitude-division polarization measurement. Time-division polarization measurement requires a rotatable polarizer and certain rotation control technology to determine the polarizer angle. The measurement device is large in volume and cannot perform real-time measurement on the target during the movement of the drill pipe; amplitude-division polarization measurement requires multiple channels to divide the light beam into three or four measurement channels, with a large structure and difficult to be highly integrated inside the drill pipe. The orthogonal dual-channel spectrum modulation polarization measurement method given by the present invention has the characteristics of polarization spectrum snapshot measurement, with a compact structure and high integration, and has better spectral restoration resolution and polarization demodulation accuracy compared with the single-channel measurement method. In the present invention, the polarization spectrum measurement technology and the drilling technology are integrated to realize the in-situ measurement of the polarization spectrum characteristics of the profile lunar soil during the boring process of the drill bit, and then the radiation spectrum and polarization spectrum are used to invert the material composition and physical characteristics of the lunar soil, so as to realize the exploration of the profile resources while drilling.

[0020] As Figure 1As shown in the figure, the in-situ lunar resource exploration device according to the embodiment of the present invention mainly includes a screw drill 1, an illumination light source module 2, a polarization spectroscopy detection module 3, and a dual-channel spectroscopy measurement module 4.

[0021] The screw drill 1 is used for lunar soil tunneling, including a drill pipe 1-1. The polarization spectroscopy detection module 3 is integrated inside the drill pipe. A sapphire transparent window 1-5 is provided on the side wall of the drill pipe for transmitting illumination light and target reflected light. An optical fiber rotary connector 1-2 is installed at the top of the drill pipe to connect the illumination optical fiber, the two-channel optical signal transmission optical fiber inside the drill pipe with the external optical fiber, so as to realize the continuous transmission of the illumination light source and the measurement optical signal.

[0022] The illumination light source module 2 is used to generate broadband illumination light, which is coupled to the illumination optical fiber 1-4 and then transmitted to the inside of the polarization spectroscopy detection module 3.

[0023] The polarization spectroscopy detection module 3 is used to generate unbiased parallel light to irradiate the target, receive the target reflected light, perform spectral modulation on the reflected light, modulate the polarization information in the spectral dimension, and generate two orthogonal modulated light beams, and transmit the optical signal to the dual-channel spectroscopy measurement module 4 through the polarization-maintaining transmission optical fiber 1-3.

[0024] The dual-channel spectroscopy measurement module 4 is used to complete the spectral imaging of the orthogonal light beams with spectral modulation and store the modulated spectral images.

[0025] Preferably, the drill pipe 1-1 of the screw drill 1 is a hollow structure, the outer layer of the drill pipe is a rigid protection surface, and the optical fibers inside the drill pipe are connected to the illumination light source module 2 and the optical fibers of the dual-channel spectroscopy measurement module 4 at the top by using the optical fiber rotary connector 1-2. There is a sapphire transparent window 1-5 near the bottom of the drill pipe. The light emitted by the illumination light source module 2 forms unbiased parallel light after collimation and depolarization and irradiates the lunar soil on the side wall of the drill hole. The polarization spectroscopy measurement probe 3-2 collects the reflected light of the lunar soil; the reflected light is collimated by the pre-collimation objective lens 3-2-1 in the polarization spectroscopy measurement probe 3-2 and then passes through the achromatic quarter-wave plate 3-2-2, the multi-stage wave plate 3-2-3, the beam splitting prism 3-2-4 and the spectral modulation unit composed of the first polarizer 3-2-5 and the second polarizer 3-2-6 with perpendicular transmission directions in sequence, and forms two orthogonal light beams, so as to realize the modulation of the polarization information of the reflected light in the spectral dimension; the two orthogonal light beams are coupled to the spectrometer double slit 4-1 of the dual-channel spectroscopy measurement module 4 through the polarization-maintaining transmission optical fiber 1-3. After being collimated by the collimating mirror 4-2 inside the dual-channel spectroscopy measurement module 4, dispersed by the dispersion element 4-4 and imaged by the focusing mirror 4-3, the two modulated spectra are recorded by the detector 4-5; then the modulated spectra are demodulated to obtain the spectrum and polarization information of the reflected light of the lunar soil; the resource distribution and content, as well as the physical characteristics of the original lunar soil, are inversed by using the polarization spectroscopy characteristics of the lunar soil. As the drill pipe tunnels, the in-situ exploration of the mineral resources in the deep profile of the lunar subsurface can be realized.

[0026] Preferably, in the present invention, the drill pipe 1-1 of the auger tool 1 facilitates the integration of the micro measurement device and the optical fiber inside. A sapphire transparent window 1-5 is installed on the side wall near the lower part of the screw. The top of the drill pipe is an optical fiber rotary connector 1-2, which realizes the connection of the optical fiber inside and outside the drill pipe.

[0027] The illumination light source module 2 includes a light source controller 2-1 and a broadband illumination light source 2-2. The light source controller 2-1 is used to supply power to the broadband illumination light source 2-2 and adjust the brightness. The two are integrated together. The broadband illumination light source generates visible-near infrared broadband light in the range of 400-2300nm and is coupled to the illumination optical fiber.

[0028] As Figure 2 shown, the polarization spectrum detection module 3 is composed of an illumination light source head 3-1 and a polarization spectrum measurement probe 3-2. The light emitted from the end of the illumination optical fiber becomes an unbiased parallel light beam after passing through the collimating lens 3-1-1 and the depolarizer 3-1-2 and irradiates the detection target 3-3. The target reflected light is first received by the pre-collimating objective lens 3-2-1 in the polarization spectrum measurement probe 3-2, and then successively enters the achromatic quarter-wave plate 3-2-2, the multi-stage wave plate 3-2-3, and the beam splitting prism 3-2-4 in parallel to form two light beams with perpendicular propagation directions. After the two light beams pass through the first polarizer 3-2-5 and the second polarizer 3-2-6 respectively, the polarization spectrum modulation of the incident light beam is completed. The light beam perpendicular to the original propagation direction is reflected by the right-angle reflection prism 3-2-7, and the two modulated light beams are respectively focused by the imaging lens 3-2-8 and coupled to the polarization-maintaining transmission optical fiber 1-3.

[0029] Let the optical axis of the polarization spectrum measurement probe 3-2 be the z-axis, and an xyz coordinate system is constructed. The coordinate system satisfies the right-hand rule. The fast axis direction of the achromatic quarter-wave plate 3-2-2 is parallel to the y-axis, the fast axis direction of the multi-stage wave plate 3-2-3 forms an angle of 45° with the positive x-axis, the light transmission axis direction of the first polarizer 3-2-5 forms an angle of 0° with the positive x-axis, and the light transmission axis direction of the second polarizer 3-2-6 forms an angle of 90° with the positive x-axis; in addition, in order to measure the polarization spectrum of the target reflected light at a large phase angle, the optical axis direction of the polarization spectrum measurement probe and the incident direction of the unbiased parallel light form an angle of 90°. In the present invention, since the lunar soil reflected light is mainly a linearly polarized component, the linearly polarized information is measured in this design.

[0030] The present invention also provides a method for demodulating detection data based on polarization spectrum modulation of a lunar resource in-situ exploration device while drilling. By demodulating the modulated spectrum received by the dual-spectrum measurement module, the broadband polarization information and hyperspectral information of the lunar soil reflected light are obtained simultaneously, and then the profile resource distribution and lunar soil physical properties are inverted by using this information, including the following steps:

[0031] Step 1. During the tunneling process of the auger drill pipe, the illumination light source generates broadband parallel light to irradiate the detection target, generating reflected light.

[0032] Step 2. After the reflected light passes through the polarization spectroscopy measurement probe, polarization spectroscopy modulation is completed, realizing the modulation of polarization information in the spectral dimension and generating two orthogonally modulated light beams; the dual-channel spectroscopy measurement module completes the reception of the orthogonally modulated light beams, performs spectral imaging, and obtains two orthogonally modulated spectra.

[0033] According to the knowledge of polarization optics, the Mueller matrix of the pre-collimating objective lens 3-2-1 in the polarization spectroscopy measurement probe 3-2 is:

[0034] (1)

[0035] where represents the bidirectional attenuation of the pre-collimating objective lens.

[0036] The Mueller matrix of the achromatic quarter-wave plate is:

[0037] (2)

[0038] The Mueller matrix of the multi-stage wave plate is:

[0039] (3)

[0040] where represents the delay of the multi-stage wave plate, , represents the crystal birefringence of the multi-stage wave plate, represents the thickness of the multi-stage wave plate; represents the wavelength.

[0041] The Mueller matrix of the two orthogonal polarizers is:

[0042] (4)

[0043] where, when the intermediate parameter represents the Mueller matrix of the 0° polarizer, and when the intermediate parameter represents the Mueller matrix of the 90° polarizer.

[0044] The Mueller matrix is used to substitute into formula (6) to solve the Stokes vector of the system output light.

[0045] According to the principle of polarization optics, the polarization Stokes vector of the incident light can be expressed as:

[0046] (5)

[0047] Among them, represents the spectral radiant intensity of the incident light, , represents the polarization parameter of the incident light ray.

[0048] The Stokes vector of the light emerging from the polarizer is related to the incident light and is expressed as:

[0049] (6)

[0050] The light beam that has completed polarization modulation is transmitted through the polarization-maintaining transmission fiber 1-3 to the dual-channel spectral measurement module 4. After the light emerging from the two fiber ends passes through two slits respectively, it successively passes through the collimating mirror 4-2, the dispersion element 4-4, and the focusing mirror 4-3, and then forms an image on the detector 4-5, forming two separate modulated spectra.

[0051] Since the detector 4-5 is only sensitive to the intensity information of the incident light, substituting the Mueller matrices of the above devices into Equation (6) and extracting the first row of the Stokes vector of the emerging light, the two modulated spectra obtained on the detector image plane can be obtained , as:

[0052] (7)

[0053] (8)

[0054] Among them, the intermediate parameter , the intermediate parameter , the intermediate parameter , the intermediate parameter , the intermediate parameter , are the modulation parameters of the two orthogonal modulated spectra. The intermediate parameter , the intermediate parameter , the intermediate parameter , the intermediate parameter can be obtained by the method of polarization calibration.

[0055] Step 3: Demodulate the polarization spectral information by using the two orthogonal modulated spectra.

[0056] First, normalize the two detected modulated spectra as follows:

[0057] (9)

[0058] Demodulate the normalized spectra within a modulation period:

[0059] (10)

[0060] Among them, represents the objective function, is the measured value, represents the sampling point count, and N is the number of sampling points within a modulation period; the modulation period is , is the demodulation center wavelength; the Levenberg - Marquardt (LM) least mean square algorithm is used for fitting to obtain the linear polarization parameter at the center wavelength with the maximum similarity between the measured value and the theoretical value;

[0061] After obtaining the polarization information of the incident light, the spectral radiation of the incident light is calculated as shown in the following formula:

[0062] (11)

[0063] During the tunneling process of the drilling tool, based on the polarization spectral information of lunar soil at different depths collected by the dual - channel spectral measurement module 4, this data can be used to invert the distribution of lunar resources in the profile and the original physical properties of lunar soil, thereby providing a reference for the mining depth of subsequent lunar resource extraction equipment and the selection of landing points and base construction sites for future lunar missions.

Claims

1. A lunar resource in-situ drilling exploration device, characterized in that: The invention comprises a spiral drilling tool, an illumination light source module, a polarization spectrum detection module and a dual-channel spectrum measurement module; the internal optical fiber of the spiral drilling tool is connected to the external illumination light source module and the optical fiber of the dual-channel spectrum measurement module through an optical fiber rotary connector; the light emitted by the illumination light source module is collimated and depolarized to form unbiased parallel light to illuminate the lunar soil on the side wall of the borehole, and the polarization spectrum measurement probe collects the reflected light from the lunar soil; the reflected light is collimated by the front collimating objective lens of the probe and then passes through a polarization spectrum modulation unit composed of an achromatic 1 / 4 wave plate, a multi-level wave plate, a beam splitting prism and a first polarizer and a second polarizer whose transmission directions are perpendicular to each other, and forms two orthogonal light beams, so as to realize the modulation of the polarization information of the reflected light in the spectral dimension; the two orthogonal light beams are coupled to the two slits of the dual-channel spectrum measurement module through a polarization-maintaining transmission optical fiber, and the two modulated spectra are recorded by a detector after being collimated by a collimator mirror inside the spectrum measurement module, grating dispersion and spectrum imaging; the modulated spectrum is then demodulated to obtain the spectrum and polarization information of the reflected light from the lunar soil; the polarization spectrum characteristics of the lunar soil are used to invert the resource distribution and content, as well as the physical characteristics of the original lunar soil.

2. The lunar resource in-situ drilling exploration device according to claim 1, characterized in that: As the drill rod is excavated, in-situ exploration of the mineral resources in the deep profile of the lunar subsurface is achieved; the spiral drilling tool includes a drill rod, which is a hollow structure, the outer layer of the drill rod is a rigid protective surface, and is equipped with spiral blades, and a fiber optic rotary connector is arranged on the top.

3. The lunar resource in-situ drilling exploration device according to claim 2, characterized in that: A sapphire transparent window is provided near the bottom of the drill rod for scanning and measuring the side wall of the borehole.

4. The lunar resource in-situ drilling exploration device according to claim 1, characterized in that: The polarization spectrum detection module includes an illumination light source head and a polarization spectrum measurement probe.

5. The lunar resource in-situ drilling exploration device according to claim 1, characterized in that: The illumination light source module comprises a light source controller, an illumination light source and an illumination optical fiber; the light source controller controls the illumination light source to emit light, and the emitted light is coupled to the illumination optical fiber; the illumination light is emitted at the far end of the optical fiber, the light first passes through a collimating lens to form a parallel light beam, and then is depolarized by a depolarizer to emit unbiased light to illuminate the target on the side wall of the borehole; the unbiased illumination light is reflected at the detection target on the side wall of the borehole to generate reflected light.

6. The lunar resource in-situ drilling exploration device according to claim 1, characterized in that: The polarization spectrum measurement probe comprises a front collimating objective lens, an achromatic 1 / 4 wave plate, a multi-stage wave plate, a beam splitting prism, a right-angle reflection prism, two polarizers whose transmission axes are perpendicular to each other, an imaging lens and a polarization-maintaining transmission optical fiber. The optical axis direction of the polarization spectrum measurement probe is 90° to the incident direction of unbiased parallel light, and is used to receive the reflected polarization spectrum at a large phase angle of 90°.

7. The lunar resource in-situ drilling exploration device according to claim 6, characterized in that: The fast axis direction of the achromatic quarter wave plate and the fast axis direction of the multi-stage wave plate form an angle of 45°, and the light transmission directions of the two polarizers form angles of 0° and 90° with the achromatic quarter wave plate respectively; After the reflected light enters the polarization spectrum measurement probe, the light is first converted into parallel light by the front collimating objective lens, and the parallel light is modulated by the achromatic 1 / 4 wave plate and the multi-level wave plate, and then split into two light beams by the beam splitting prism and respectively analyzed by two orthogonal polarizers, so as to realize the modulation of the incident light polarization information in the spectral dimension; The two orthogonal modulated light beams are focused by imaging lenses and then coupled to polarization-maintaining transmission optical fibers.

8. The lunar resource in-situ drilling exploration device according to claim 1, characterized in that: The dual-channel spectrum measurement module includes two slits, a collimator, a spectral dispersion element, a focusing lens, and a detector. The two orthogonal light beams that complete polarization spectrum modulation enter the dual-channel spectrum measurement module through the two slits respectively, and are received by the detector after passing through the collimator, the spectral dispersion element, and the focusing lens, forming two separate modulation spectra on the focal plane of the detector. The dual-channel spectrum measurement module completes signal acquisition and storage; The multi-channel optical fiber rotary connector connects the illumination optical fiber in the drill rod and the two-channel polarization-maintaining transmission optical fiber with the external optical fiber, thereby realizing the continuous transmission of the optical signals of the illumination light source module and the polarization spectrum measurement module.

9. The detection data demodulation method based on the lunar resource in-situ drilling exploration device according to any one of claims 1 to 8 is characterized in that: By demodulating the modulated spectrum received by the dual-spectrum measurement module, the wide-band polarization information and hyperspectral information of the lunar soil reflected light are obtained simultaneously, and then this information is used to invert the profile resource distribution and physical properties of the lunar soil.

10. The detection data demodulation method according to claim 9, characterized in that: The steps include: Step 1: During the excavation process of the auger rod, the illumination light source generates a wide-spectrum parallel light to illuminate the detection target and generate reflected light; Step 2: After the reflected light passes through the polarization spectrum measurement head, polarization spectrum modulation is completed to achieve modulation of polarization information in the spectrum dimension and generate two orthogonal modulated light beams; Step 3, the dual-channel spectrum measurement module completes the reception of the orthogonal modulated light beam, performs spectrum imaging, and obtains two orthogonal modulated spectra; The expressions of the two orthogonal modulation spectra collected by the dual-channel spectrometer are as follows: （7） （8） in, represents the spectral radiation intensity reflected by the lunar soil, , Indicates the polarization parameter of the reflected light; intermediate parameter , intermediate parameters , intermediate parameters , intermediate parameters , intermediate parameters , are the modulation parameters of the two orthogonal modulation spectra, where It represents the two-way attenuation of the front collimator group in the polarization spectrum measurement probe. represents the delay of the multi-stage wave plate, , represents the birefringence of the multi-stage wave plate crystal, Indicates the thickness of multi-level wave plates; intermediate parameters , intermediate parameters , intermediate parameters , intermediate parameters , obtained by polarization calibration method; In order to understand the spectrum and polarization information of the reflected light, the two detected modulation spectra are first normalized as follows: （9） in, is the normalized spectrum; In one modulation cycle, the normalized spectrum is demodulated: （10） in, represents the objective function, is the measured value, N is the number of sampling points in one modulation cycle; the modulation cycle is , To demodulate the central wavelength; the Levenberg-Marquardt least mean square algorithm is used for fitting so that the measured value and the theoretical value have the maximum similarity to obtain the linear polarization parameters at the central wavelength; After the reflected light polarization information is obtained, the reflected light spectral radiation is calculated as shown in the following formula: （11）。

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