Multi-dimensional spectrum detection device based on combination of transmission surface and scattering surface

Abstract

The invention discloses a multi-dimensional spectrum detection device based on combination of a transmission surface and a scattering surface, and belongs to the technical field of spectrum detection.The device comprises a camera obscura, a light source part, a detection part and a sample pool, the detection part and the sample pool are arranged in the camera obscura, the light source part comprises a light source and an angle fixing base, and the light source is connected to the angle fixing base through an optical fiber; an achromatic collimator is arranged on the end surface of the angle fixing seat and is arranged below the sample pool; the detection part comprises an emergent light detector arranged right above the midpoint of the sample cell and a plurality of scattered light detectors arranged on the side surface of the sample cell, and the emergent light detector collects transmission light spots generated after the sample is irradiated and obtains transmission information; the scattered light detector collects scattered light spots generated after the sample is irradiated and obtains a scattered spectrum image. According to the invention, the limitation of a single detection mode is effectively reduced, the distribution characteristics of scattered light at different angles and background information of transmission light are utilized to form complementary calibration, and the spectral quantitative analysis precision of the substance component content is improved.

Description

Technical Field

[0001] This invention belongs to the field of spectral detection technology, specifically relating to a multidimensional spectral detection device based on the combination of a transmission surface and a scattering surface. Background Technology

[0002] Spectroscopic analysis is a measurement and analysis method based on the principles of spectroscopy and analytical chemistry. It features low detection costs and short testing times. Furthermore, in the process of detecting and analyzing substances using spectroscopic analysis technology, no solvents need to be added, reducing the degree of contamination or damage to the sample. It is widely used in industries such as biopharmaceuticals, medicine, and petrochemicals.

[0003] Currently, near-infrared spectroscopy has become the most commonly used spectral analysis method, offering high sensitivity, fast detection speed, and stable performance. Among these methods, transmission spectroscopy, with its advantages of being non-contact and having a fast response, is widely used in liquid analysis. This method measures the intensity of transmitted light after incident light passes through a medium and establishes a quantitative relationship between light intensity attenuation and substance concentration based on the Lambert-Beer law. However, with increasing requirements for detection accuracy, especially when dealing with complex media with multiple optical properties, the limitations of traditional detection methods are becoming increasingly apparent. When detecting complex media such as dye solutions, the following defects exist: 1) A single transmission light path cannot distinguish between absorption and scattering effects, leading to concentration inversion errors; 2) The lack of scattering information makes it impossible to characterize the physical properties of the medium, such as particle size and distribution; 3) High-turbidity samples are prone to light saturation, and the light signal is severely attenuated in the sample, leading to transmission surface failure.

[0004] Therefore, there is an urgent need for a multidimensional spectral detection system that supports the simultaneous acquisition of transmission and scattering information to achieve high-precision quantitative analysis of material composition. Summary of the Invention

[0005] To address the problems in the prior art, this invention provides a multidimensional spectral detection device based on the combination of a transmission surface and a scattering surface.

[0006] The technical solution of the present invention is as follows:

[0007] In a first aspect, the present invention discloses a multidimensional spectral detection device based on the combination of a transmission surface and a scattering surface, comprising a dark chamber and a light source, as well as a detection unit and a sample cell disposed within the dark chamber, wherein the sample cell is used to hold the sample to be detected; the light source includes a light source and an angle fixing base, the light source being connected to the angle fixing base via an optical fiber, and an achromatic collimator being provided on the upper surface of the angle fixing base, the achromatic collimator being disposed below the sample cell; the light output from the light source, after passing through the achromatic collimator, uniformly illuminates the sample in the sample cell as vertically upward light.

[0008] The detection unit includes an outgoing light detector positioned directly above the center of the sample cell and multiple scattering light detectors positioned on the side of the sample cell. The outgoing light detector collects the transmitted light spot generated after the sample is irradiated and obtains transmission information. The scattering light detector collects the scattered light spot generated after the sample is irradiated and obtains a scattering spectrum image. The angle fixing seat and achromatic collimator are located inside the dark chamber, and the light source is located inside or outside the dark chamber.

[0009] Furthermore, the detection unit also includes multiple controllers and multiple precision displacement platforms for moving the scattered light detector. The moving scattered light detector is mounted on the precision displacement platform, and each precision displacement platform is connected to a controller. The controller controls the corresponding precision displacement platform to perform linear motion in the horizontal and vertical directions according to a preset program or instructions received from the outside in real time. The precision displacement platform drives the scattered light detector to scan the spatial area on the side of the sample cell point by point to obtain the spectral information at each scanning position. Then, combined with the spatial coordinates at the scanning position, a scattered spectral image containing spectral information is generated.

[0010] Secondly, the present invention discloses a multidimensional spectral detection method using the aforementioned device, comprising the following steps:

[0011] The sample to be tested is injected into the sample cell, the light source is turned on, and the light emitted by the light source enters the angle fixing seat through the optical fiber, and then is irradiated into the sample cell by the achromatic collimator. At this time, the outgoing light detector collects the transmitted light spot generated after the sample is irradiated and obtains the transmission information. At the same time, the controller controls the precision displacement platform to perform linear motion in the horizontal and vertical directions according to the preset program or the instructions received from the outside in real time. The scattered light detector on the precision displacement platform scans the spatial area on the side of the sample cell point by point. The scattered light detector collects the spectral information at each scanning position, and then combines it with the spatial coordinates of the scanning position to generate a scattered spectral image containing spectral information.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] This device includes an outgoing light detector positioned directly above the center of the sample cell, used to acquire the transmitted light spot generated after the sample is irradiated to obtain transmission information; and a scattering light detector positioned around the sample cell, used to acquire the scattered light spot generated after the sample is irradiated to obtain a scattering spectrum image. The scattering light detectors are mounted on precision displacement platforms. Each precision displacement platform, under the coordinated control of a controller, achieves high spatial resolution scattering spectrum detection. By precisely moving the precision displacement platform along a preset trajectory in three-dimensional space, the scattering light detectors sequentially cover the detection planes at various angles in the front, sides, and peripheral extension directions of the sample cell. Combined with the transmission information acquired by the outgoing light detector above, a comprehensive three-dimensional detection system for the distribution of scattered light in three-dimensional space is constructed in a multi-point scanning and multi-surface coverage manner. At the same time, the direct path information of the transmitted light is completely preserved. By fusing the multi-dimensional spectral data of transmitted and scattered light, comprehensive light signal acquisition from the direct path to the multi-angle scattering path is achieved, effectively reducing the limitations of a single detection mode. The distribution characteristics of scattered light at different angles and the background information of transmitted light form complementary calibration, thereby improving the accuracy of spectral analysis of the content of the measured substance.

[0014] Compared to traditional single-mode detection methods, this approach offers several advantages: A precision moving platform drives the scattered light detector along the sample cell, dynamically acquiring continuous forward-to-backward scattering angle signals. Simultaneously, a detector positioned above the sample cell captures the transmitted light at a fixed point, enabling simultaneous acquisition of both transmission and scattering modal information. This design captures key scattering features such as particle size distribution and aggregation state through spatial scanning, while accurately quantifying the overall transmission attenuation characteristics of the sample. This avoids systematic errors and data fragmentation introduced by multiple measurements and significantly improves the detection accuracy of complex turbid systems. Furthermore, the active scanning capability of the moving platform effectively locates and eliminates local interference such as bubbles and container defects, ultimately outputting more comprehensive and reliable optical property analysis results. When high-turbidity samples exhibit light saturation, the transmission surface fails. Scattered light detectors placed in front of and to the side of the sample cell detect the intensity of scattered light at a 90° angle to the incident light direction, acquiring scattering spectral images from which the content of the analyte can be calculated. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the working state of the present invention;

[0017] Figure 3 For the present invention Figure 1 Enlarged view of the structure at point A in the middle;

[0018] Figure 4 For the present invention Figure 1 Enlarged view of the structure at point B in the middle.

[0019] In the diagram: 1. Detection unit base; 2. Detection frame base; 3. Detection frame; 4. Detector base; 5. Detector extension rod; 6. Emitting light detector; 7. Angle fixing seat; 8. Achromatic collimator; 9. Sample cell support; 10. Sample cell; 11. Dark box; 12. Optical fiber; 13. Light source; 14. Straight connection line; 15. First controller; 16. First scattered light detector; 17. First precision displacement platform; 18. Second scattered light detector; 19. Second precision displacement platform; 20. Second controller. Detailed Implementation

[0020] The present invention will be further described and illustrated below with reference to specific embodiments. The embodiments described are merely examples of the content of this disclosure and do not limit the scope of the invention. The technical features of each embodiment in the present invention can be combined accordingly, provided that there is no mutual conflict.

[0021] To address the shortcomings of existing technologies, this invention designs a multidimensional spectral detection device based on the combination of transmission and scattering surfaces. By fusing multidimensional spectral data of transmitted and scattered light, it achieves omnidirectional optical signal acquisition from direct paths to multi-angle scattering paths, effectively reducing the limitations of single detection modes. It also utilizes the distribution characteristics of scattered light at different angles to form complementary calibration with the background information of transmitted light.

[0022] The apparatus of the present invention will now be described in further detail with reference to the accompanying drawings:

[0023] like Figures 1-4 As shown, this embodiment of the invention provides a multidimensional spectral detection device based on a combination of a transmission surface and a scattering surface. The device includes a dark chamber, a detection unit, a sample unit, and a light source unit.

[0024] The sample section includes a sample cell 10 and a sample cell support 9. The sample cell 10 is a rectangular transparent groove used to hold the sample to be tested. The sample cell support 9 is located below the sample cell 10 and is used to support the sample cell 10.

[0025] The light source unit includes a light source 13, an angle fixing base 7, and an achromatic collimator 8. The light source 13 is connected to the angle fixing base 7 via an optical fiber 12. The achromatic collimator 8 is located on the upper surface of the angle fixing base 7. The angle fixing base 7 and the achromatic collimator 8 are located below the sample unit. The angle fixing base 7 is used to ensure that light of different wavelengths propagates in parallel with high precision. The light output from the light source 13, after passing through the achromatic collimator 8, uniformly illuminates the sample in the sample cell 10 as vertically upward light. The rectangular transparent groove-shaped sample cell 10 ensures that the light emitted from the achromatic collimator 8 is always perpendicularly incident on the sample cell 10, eliminating refraction offset, improving the accuracy of scattering angle positioning, suppressing multiple reflections of stray light, and reducing background noise.

[0026] The detection unit includes a detection unit base 1, a detection frame base 2, a detection frame 3, a detector base 4, a detector extension rod 5, an emitted light detector 6, two scattered light detectors, two precision displacement platforms, and two controllers. The detection frame base 2 is located above the detection unit base 1, the detection frame 3 is located above the detection frame base 2, and the detector base 4 is located around the outside of the detection frame 3 and near the top of the detection frame 3. One end of the detector base 4 is fixedly connected to the detector extension rod 5, and the bottom surface of the detector extension rod 5 away from the detector base 4 is fixedly connected to the emitted light detector 6. By adjusting the length of the detector extension rod 5, the emitted light detector 6 is extended to directly above the midpoint of the sample cell 10. The emitted light detector 6 collects the transmitted light spot generated after the sample is irradiated and obtains transmission information.

[0027] A first scattered light detector 16 is mounted on a first precision moving platform 17, which is positioned in front of the sample cell 10 and opposite the detection frame 3 on both sides of the sample cell 10. The first scattered light detector 16 is used to collect the scattered light spot in front of the sample cell 10 to obtain the scattered light signal. The first precision moving platform 17 is connected to the first controller 15 via a direct connection cable 14. A second scattered light detector 18 is mounted on a second precision moving platform 19, which is positioned to the side of the sample cell 10. The second scattered light detector 18 is used to collect the scattered light spot to the side of the sample cell 10 to obtain the scattered light signal. The second precision moving platform 19 is connected to the second controller 20 via another direct connection cable. The scattered light detectors collect the scattered light spot generated after the sample is irradiated and obtain a scattering spectrum image.

[0028] Each controller, based on a preset program or real-time external commands, transmits control instructions to the precision displacement platform via a direct connection. This controls the connected precision displacement platform to perform linear motion in both horizontal and vertical directions; specifically, it controls the first precision moving platform 17 to move horizontally along the x and z axes, and the second precision moving platform 19 to move horizontally along the y and z axes. The precision displacement platform drives the scattered light detector to scan the spatial region on the side of the sample cell point by point, obtaining spectral information at each scanning position. The scattered light detector also combines the spectral information of each scanning position with its spatial coordinates to generate a scattered light spectrum image containing the spectral information, achieving high spatial resolution spectral information acquisition.

[0029] Among them, the parallel edges of the rectangular transparent groove-shaped sample cell 10 ensure that the linear scanning path of each precision displacement platform is free of redundancy, maximizing the spatial resolution.

[0030] like Figures 1-4As shown, in this embodiment, both the detection unit and the sample unit are located inside the dark box, the angle fixing seat 7 and the achromatic collimator 8 of the light source unit are located inside the dark box, and the light source 13 of the light source unit is located outside the dark box.

[0031] In another embodiment of the present invention, the light source 13 of the light source unit is disposed inside the dark box.

[0032] In a preferred embodiment of the invention, the light source 13 is a laser light source. The sample cell 10 is made of quartz.

[0033] The emitted light detector 6 is a hyperspectrometer or hyperspectral imaging device, and the wavelength band that the emitted light detector 6 responds to is one or more of ultraviolet light, visible light or infrared light.

[0034] The first scattered light detector 16 and the second scattered light detector 18 are spectrometer devices, and the wavelength bands responded by the first scattered light detector 16 and the second scattered light detector 18 are one or more of ultraviolet light, visible light or infrared light.

[0035] This embodiment also provides a multidimensional spectral detection method using the aforementioned device, comprising the following steps:

[0036] The sample cell 10 is placed directly below the emitted light detector 6, and the sample to be tested is placed in the sample cell 10, so that there are no other ambient light sources in the dark box 11. The dark box 11 is a standard dark box, which can eliminate the influence of ambient light on the test results.

[0037] The laser source 13 is activated and begins emitting laser light. Ideally, the laser source 13 should also be placed inside the dark box 11 to avoid interference from other ambient light sources. The laser light passes through the optical fiber 12 and enters the angle fixing seat 7, then is irradiated into the sample cell 10 by the achromatic collimator 8. The achromatic collimator 8 consists of a set of large numerical aperture lens systems, which can be used with multimode optical fibers with large numerical apertures. It can shape the beam emitted from the multimode fiber and couple the spatial beam into the multimode fiber to achieve good collimation and spot shape over long distances. At this time, the output photodetector 6 collects the transmitted light spot generated after the sample is irradiated and obtains transmission information.

[0038] The first scattered light detector 16 is placed on the first precision displacement platform 17 in front of the sample cell 10 and connected to the first controller 15 via a straight-through cable 14. The first controller 15 receives external commands to precisely displace the first precision displacement platform 17, causing the first scattered light detector 16 to scan point by point in the x-axis and z-axis directions, acquiring spectral information at each scanning position, and combining the spectral information at each scanning position with the spatial coordinates of that scanning position to generate a first scattered light spectrum image containing spectral information. Similarly, the second scattered light detector 18 is placed on the second precision displacement platform 19 to the side of the sample cell 10 and connected to the second controller 20 via another straight-through cable. The second controller 20 receives external commands to precisely displace the second precision displacement platform 19, causing the second scattered light detector 18 to scan point by point in the y-axis and z-axis directions, acquiring spectral information at each scanning position, and combining the spectral information at each scanning position with the spatial coordinates of that scanning position to generate a second scattered light spectrum image containing spectral information.

[0039] By combining the scattering spectrum images of the first scattered light detector 16 in front of the sample cell 10 and the second scattered light detector 18 on the side with the transmission information collected by the emitted light detector above, a comprehensive three-dimensional detection system for the distribution of scattered light in three-dimensional space is constructed in a multi-point scanning and multi-surface coverage manner. At the same time, the direct path information of the transmitted light is completely preserved. By fusing the multi-dimensional spectral data of transmitted light and scattered light, comprehensive light signal acquisition from the direct path to the multi-angle scattering path is achieved, effectively reducing the limitations of a single detection mode. The distribution characteristics of scattered light at different angles and the background information of transmitted light are used to form complementary calibration, thereby improving the accuracy of spectral quantitative analysis of the content of material components.

[0040] The same technical effect can also be achieved by replacing the light source with other wavelength ranges and similar light intensities, and by replacing the support while maintaining the relative positions of the collimator and the sample cell.

[0041] This invention combines the transmission information collected by the upper emitted light detector to construct a comprehensive three-dimensional scattered light detection system that detects the distribution of scattered light in three-dimensional space through multi-point scanning and multi-faceted coverage. At the same time, it completely preserves the direct path information of the transmitted light. By fusing the multi-dimensional spectral data of transmitted and scattered light, it achieves comprehensive light signal acquisition from the direct path to the multi-angle scattering path, effectively reducing the limitations of a single detection mode. It utilizes the distribution characteristics of scattered light at different angles and the background information of transmitted light to form complementary calibration, thereby improving the accuracy of spectral quantitative analysis of the content of material components.

[0042] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. Those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A multidimensional spectral detection device based on a combination of a transmission surface and a scattering surface, characterized in that, The device includes a dark box and a light source, as well as a detection unit and a sample cell (10) set inside the dark box. The sample cell (10) is used to hold the sample to be tested. The light source includes a light source (13) and an angle fixing seat (7). The light source (13) is connected to the angle fixing seat (7) through an optical fiber (12). An achromatic collimator (8) is provided on the upper surface of the angle fixing seat (7). The achromatic collimator (8) is located below the sample cell (10). The light output from the light source (13) is uniformly irradiated in the sample cell (10) with vertical upward light after passing through the achromatic collimator (8). The detection unit includes an outgoing light detector (6) positioned directly above the center of the sample cell (10) and multiple scattering light detectors positioned on the side of the sample cell (10). The outgoing light detector (6) collects the transmitted light spot generated after the sample is irradiated and obtains transmission information. The scattering light detectors collect the scattered light spot generated after the sample is irradiated and obtain a scattering spectrum image. The angle fixing seat (7) and the achromatic collimator (8) are located inside the dark box, and the light source (13) is located inside or outside the dark box.

2. The multidimensional spectral detection device based on the combination of transmission and scattering surfaces according to claim 1, characterized in that, The sample cell (10) is a rectangular transparent trough and is made of quartz.

3. The multidimensional spectral detection device based on the combination of transmission and scattering surfaces according to claim 1, characterized in that, The multidimensional spectral detection device also includes a sample cell support (9) for supporting the sample cell (10).

4. The multidimensional spectral detection device based on the combination of transmission and scattering surfaces according to claim 1, characterized in that, The detection unit also includes a detection unit base (1), a detection frame base (2), a detection frame (3), and a detector base (4). The detection frame base (2) is located above the detection unit base (1), the detection frame (3) is located above the detection frame base (2), and the detector base (4) is located around the outside of the detection frame (3) and near the top of the detection frame (3). A detector extension rod (5) is fixedly connected to the upper part of the detector base (4). The bottom surface of the detector extension rod (5) away from the detector base (4) is fixedly connected to the emitted light detector (6). By adjusting the length of the detector extension rod (5), the emitted light detector (6) is extended to directly above the midpoint of the sample cell (10).

5. The multidimensional spectral detection device based on the combination of transmission and scattering surfaces according to claim 1, characterized in that, The detection unit also includes multiple controllers and multiple precision displacement platforms for moving the scattered light detector. The moving scattered light detector is mounted on the precision displacement platform, and each precision displacement platform is connected to a controller. The controller controls the corresponding precision displacement platform to perform linear motion in the horizontal and vertical directions according to a preset program or instructions received from the outside in real time. The precision displacement platform drives the scattered light detector to scan the spatial area on the side of the sample cell point by point to obtain the spectral information at each scanning position. Then, combined with the spatial coordinates at the scanning position, a scattered spectral image containing spectral information is generated.

6. The multidimensional spectral detection device based on the combination of transmission and scattering surfaces according to claim 1, characterized in that, The emitted light detector (6) is a hyperspectrometer or a hyperspectral imaging device, and the emitted light detector (6) responds to one or more of ultraviolet light, visible light or infrared light. The scattered light detector is a spectrometer device, and the wavelength band responded by the scattered light detector is one or more of ultraviolet light, visible light, or infrared light.

7. The multidimensional spectral detection device based on the combination of transmission and scattering surfaces according to claim 1, characterized in that, The light source (13) is a laser light source.

8. A multidimensional spectral detection method using the device described in claim 5, characterized in that, Includes the following steps: The sample to be tested is injected into the sample cell (10), and the light source (13) is turned on. The light emitted by the light source (13) enters the angle fixing seat (7) through the optical fiber (12), and then is irradiated by the achromatic collimator (8) onto the sample cell (10). At this time, the outgoing light detector (6) collects the transmitted light spot generated after the sample is irradiated and obtains the transmission information. At the same time, the controller controls the precision displacement platform to perform linear motion in the horizontal and vertical directions according to the preset program or the instructions received from the outside in real time. The scattering light detector on the precision displacement platform scans the spatial area on the side of the sample cell point by point. The scattering light detector collects the spectral information at each scanning position and then combines it with the spatial coordinates at the scanning position to generate a scattering spectrum image containing spectral information.

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