Ground object spectrometer microscopic detection assembly for aerolite sample analysis and use method

Abstract

The invention relates to the technical field of planetary spectrums, and provides a ground object spectrometer microscopic detection assembly for aerolite sample analysis and a use method, the ground object spectrometer microscopic detection assembly comprises an optical fiber collimator used for converting light beams output by an optical fiber into parallel light, the optical fiber collimator is connected with a cage type system, and a plug-in reflector is arranged in the cage type system; a plano-convex lens for converging parallel light beams is connected below the cage type system, an objective table for placing a sample is arranged below the plano-convex lens, and the objective table performs height coarse adjustment and fine adjustment through a rotary handle sleeve and a rotary thread; a left-right adjusting table is arranged below the objective table; and the right side of the cage system is sequentially connected with a doublet lens, a field diaphragm, a rubber sleeve, an adjustable magnification objective lens, a microscope objective barrel and a CMOS camera. According to the invention, the micro-area of the visible near-infrared band of the meteorite spot crystal can be well detected, and the image of the acquisition area can be obtained.

Description

Technical Field

[0001] The present invention relates to the field of planetary spectroscopy technology, and in particular to a microscopic detection component of a ground object spectrometer for meteorite sample analysis and a method of using the component. Background Art

[0002] Visible near-infrared reflectance spectroscopy records information such as electronic transitions of transition elements in the detected samples, frequency doublings and combination frequencies of molecular vibrations. It is the main detection method for studying mineral types and mineral compositions. It is widely used in deep space exploration and related laboratory research, especially in the study of planetary samples such as meteorites. Visible near-infrared reflectance spectroscopy can achieve rapid and non-destructive detection of sample material composition and has outstanding advantages.

[0003] According to existing research, visible near-infrared reflectance spectroscopy plays an important role in the exploration of meteorites and asteroids. This technology can provide key information about the composition of the surface materials of small celestial bodies and meteorites, helping scientists understand the surface characteristics of asteroids and their mineral composition, and even identify different types of asteroids and their relationship with meteorites. In deep space exploration missions, such as the interferometric imaging spectrometer (IIM) carried by the Chang'e-1 lunar exploration mission, the Mars mineral spectrometer (MMS) carried by the Tianwen-1 first Mars exploration mission, and the Mars-specific small reconnaissance imaging spectrometer (CRISM) of the Mars Reconnaissance Orbiter (MRO), all use visible near-infrared reflectance spectroscopy technology. Based on the spectral characteristics of the lunar and Martian surfaces, information such as the types, mineral composition and spatial distribution of lunar and Martian minerals is obtained, and the geological causes and evolution history of the moon and Mars are understood, and fruitful scientific results have been achieved. For example, the research team of Shandong University, based on the Chang'e-1 IIM data, drew and published the world's first 1:2.5 million lunar rock type distribution map for the entire moon, providing basic data for understanding the geological evolution process of the moon.

[0004] There are many millimeter-scale phenocrysts in meteorite samples. Measuring phenocrysts helps us understand the origin and evolution history of meteorites, as well as the characteristics of the magmatic environment in their source areas. It can also help us better understand the planetary differentiation and material separation process in the early solar system, and thus reveal the formation and evolution of the solar system.

[0005] In response to the demand for micro-area testing of samples such as meteorites, there are currently microscopic systems for laser spectroscopy systems (LIBS spectrometers, micro-Raman spectrometers, etc.) and mid-infrared spectroscopy systems (FTIR spectrometers), but the existing microscopic systems are all dedicated microscopic equipment and cannot be directly migrated to the application of ASD spectrometers. Currently, there is still a lack of microscopic detection components adapted to ASD systems. With the advancement of deep space exploration technology, planetary science research, and the continuous advancement of space exploration missions, the demand for research on minerals from outside the earth has increased significantly, such as Chang'e 5 and Chang'e 6 samples, Martian meteorites, lunar meteorites, asteroid samples, and future Tianwen-3 Mars samples. The demand for micro-area spectroscopy research on these samples is becoming increasingly urgent. Summary of the invention

[0006] The present invention provides a microscopic detection component and a method of use of a ground object spectrometer for meteorite sample analysis, which can realize micro-area detection of meteorite phenocrysts in the visible and near-infrared bands and obtain images of the collection area.

[0007] According to the present invention, a microscopic detection assembly of a ground object spectrometer for meteorite sample analysis includes a fiber collimator for converting a light beam output by an optical fiber into parallel light, the fiber collimator is connected to a cage system, and a plug-in reflector is arranged in the cage system;

[0008] A plano-convex lens for converging parallel light beams is connected to the bottom of the cage system. A stage for placing samples is provided below the plano-convex lens. The stage can be coarsely and finely adjusted in height by rotating the handle and the thread. A left and right adjustment table is provided below the stage.

[0009] The right side of the cage system is connected in sequence with a double cemented lens, a field aperture, a rubber sleeve, an adjustable magnification objective lens, a microscope objective tube and a CMOS camera.

[0010] Preferably, the CMOS camera is connected to a computer for displaying the sample imaging situation and real-time calibration of the spot position.

[0011] Preferably, an LED light ring is provided around the plano-convex lens to provide additional lighting for the sample.

[0012] Preferably, the stage is a rotatable disc structure.

[0013] The present invention provides a method for using a microscopic detection assembly of a ground object spectrometer for meteorite sample analysis, which adopts the above-mentioned microscopic detection assembly of a ground object spectrometer for meteorite sample analysis and includes the following steps:

[0014] 1) Prepare samples: Prepare corresponding samples according to research requirements;

[0015] 2) Connect the equipment: Connect the optical fiber to the tungsten lamp and the spectrum analysis device ASD, and ensure that the connection is correct; connect the CMOS camera and LED light ring to the computer;

[0016] 3) Remove the plug-in reflector: Before performing spectral measurement, the plug-in reflector needs to be removed to avoid interference;

[0017] 4) Measure spectrum: Turn on the tungsten lamp and ASD to prepare for measurement. First, adjust the whiteboard to the optimal focusing height for calibration. Then adjust the sample to the same height for spectrum measurement and collect the sample's spectrum data.

[0018] 5) Place the plug-in reflector: After the spectrum measurement is completed, re-place the plug-in reflector;

[0019] 6) Observe the image: turn on the LED light ring, adjust the field diaphragm, observe and record the imaging results.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The first independent design and construction of a microscopic ground object spectrometer

[0022] The present invention can reduce the acquisition range of the ground object spectrometer from the original centimeter level to the millimeter level, which is more conducive to the detailed detection of smaller areas in samples such as meteorites.

[0023] (2) Microscopic ASD spectrometer achieves image-spectrum integration

[0024] The present invention not only realizes the micro-area spectrum collection, but also adds an imaging function, which can use the image to search for the focal position of the visible near-infrared spectrum, improve the experimental efficiency, quickly locate the spectrum collection area, and provide the micro-area morphology information of the detection object.

[0025] (3) Micro-ASD system realizes whole machine integration

[0026] To reduce stray light, the present invention integrates all experimental instruments into a complete closed system, reduces interference from external light, and ensures the reliability of data. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of a microscopic detection assembly of a ground object spectrometer used for meteorite sample analysis in an embodiment. DETAILED DESCRIPTION

[0028] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0029] Example

[0030] like Figure 1 As shown, this embodiment provides a microscopic detection component of a ground object spectrometer for meteorite sample analysis, which includes a fiber optic collimator 1, which is used to convert the light beam output by the optical fiber into parallel light to facilitate accurate spectral acquisition; the fiber optic collimator 1 is connected to a cage system, and a plug-in reflector 2 is provided in the cage system, so that rapid switching can be performed between the spectral acquisition light path and the imaging light path.

[0031] A plano-convex lens 3 is connected to the bottom of the cage system. The plano-convex lens 3 is used to converge parallel light beams to achieve micro-area spectrum collection of the sample; an LED light ring 7 is arranged around the plano-convex lens 3 to provide additional lighting for the sample and enhance the brightness; a stage 4 for placing the sample is arranged below the plano-convex lens 3. The stage 4 is a rotatable disc structure. The stage 4 can perform coarse and fine height adjustments by rotating the handle 6 and the rotating thread 5; a left and right adjustment stage 14 is arranged below the stage 4. The left and right adjustment stage 14 is used to fine-tune the distance between the cage system and the microscope objective tube 12 to ensure that the microscope objective tube can reach the optimal working distance, thereby obtaining a clear imaging effect.

[0032] The right side of the cage system is connected in sequence with a double cemented lens 8, a field aperture 9, a rubber sleeve 10, an adjustable magnification objective lens 11, a microscope objective lens tube 12 and a CMOS camera 13, so that micro-area imaging of the sample can be performed.

[0033] The field diaphragm 9 helps to reduce stray light and improve the image quality, and the rubber sleeve 10 is provided to facilitate the adjustment of the working distance of the microscope objective tube, further ensuring the clarity of the image. The design of the entire system takes into account flexibility and functionality to meet the needs of high-precision spectroscopy and imaging.

[0034] The CMOS camera 13 is connected to a computer for displaying the sample imaging situation and real-time calibration of the light spot position.

[0035] This embodiment provides a method for using a microscopic detection assembly of a ground object spectrometer for meteorite sample analysis, using the above-mentioned microscopic detection assembly of a ground object spectrometer for meteorite sample analysis, and comprising the following steps:

[0036] 1) Prepare samples: Prepare corresponding samples according to research requirements;

[0037] 2) Connect the equipment: Connect the optical fiber to the tungsten lamp and the spectrum analysis device ASD (surface spectrometer), and ensure that the connection is correct; connect the CMOS camera 13 and the LED light ring 7 to the computer;

[0038] 3) Remove the plug-in reflector 2: Before performing spectral measurement, the plug-in reflector 2 needs to be removed to avoid interference;

[0039] 4) Measure spectrum: Turn on the tungsten lamp and ASD to prepare for measurement. First, adjust the whiteboard to the optimal focusing height for calibration. Then adjust the sample to the same height for spectrum measurement and collect the sample's spectrum data.

[0040] 5) Place the plug-in reflector 2: After the spectrum measurement is completed, re-place the plug-in reflector 2;

[0041] 6) Observe the imaging: turn on the LED light ring 7, adjust the field aperture 9, and observe and record the imaging results.

[0042] Specifically, when collecting the visible near-infrared reflectance spectrum of a micro-area, the light emitted by the tungsten lamp passes through a beam in the Y-type optical fiber, is converted into parallel light by the optical fiber collimator 1, and then converges on the sample through the plano-convex lens 3 without an anti-reflection film; the reflected light on the sample returns to the beam combining end of the Y-type optical fiber through the original optical path, and is transmitted to the ground object spectrometer via the optical fiber.

[0043] Specifically, during imaging, the light reflected from the light spot convergence position on the sample is converted into parallel light by the fiber collimator 1, and then converged by the lens to the CMOS camera (with an adjustable focal length lens barrel in front) for imaging. The LED light ring 7 is added to fill the light, and the field of view diaphragm 9 is adjusted to remove stray light to achieve sample imaging.

[0044] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A ground object spectrometer microscopic detection assembly for meteorite sample analysis, characterized in that: It comprises a fiber collimator (1) for converting a light beam outputted by an optical fiber into parallel light, wherein the fiber collimator (1) is connected to a cage system, and a plug-in reflector (2) is arranged in the cage system; A plano-convex lens (3) for converging parallel light beams is connected below the cage system, a stage (4) for placing samples is provided below the plano-convex lens (3), and the stage (4) can be coarsely and finely adjusted in height by rotating a handle (6) and a rotating thread (5); a left and right adjustment platform (14) is provided below the stage (4); The right side of the cage system is connected in sequence with a double cemented lens (8), a field diaphragm (9), a rubber sleeve (10), an adjustable magnification objective lens (11), a microscope objective lens tube (12) and a CMOS camera (13).

2. The microscopic detection assembly of the ground object spectrometer for meteorite sample analysis according to claim 1, characterized in that: The CMOS camera (13) is connected to a computer for displaying the imaging status of the sample and real-time calibration of the light spot position.

3. The microscopic detection assembly of the ground object spectrometer for meteorite sample analysis according to claim 2 is characterized in that: An LED light ring (7) is arranged around the plano-convex lens (3) to provide additional lighting for the sample.

4. The microscopic detection assembly of the ground object spectrometer for meteorite sample analysis according to claim 3 is characterized in that: The object carrier (4) is a rotatable disc-shaped structure.

5. A method for using a microscopic detection assembly of a ground object spectrometer for meteorite sample analysis, characterized in that: It adopts the microscopic detection assembly of the ground object spectrometer for meteorite sample analysis as claimed in any one of claim 4, and includes the following steps: 1) Prepare samples: Prepare corresponding samples according to research requirements; 2) Connect the equipment: Connect the optical fiber to the tungsten lamp and the spectrum analysis device ASD, and ensure that the connection is correct; connect the CMOS camera (13) and the LED light ring (7) to the computer; 3) Remove the plug-in reflector (2): Before performing spectral measurement, the plug-in reflector (2) needs to be removed to avoid interference; 4) Measure spectrum: Turn on the tungsten lamp and ASD to prepare for measurement. First, adjust the whiteboard to the optimal focusing height for calibration. Then adjust the sample to the same height for spectrum measurement and collect the sample's spectrum data. 5) Placing the plug-in reflector (2): After the spectrum measurement is completed, re-place the plug-in reflector (2); 6) Observe the image: turn on the LED light ring (7), adjust the field aperture (9), and observe and record the image results.

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