A near infrared spectrometer

Abstract

The utility model belongs to the field of analytical instrument technology discloses a kind of near infrared spectrum analyzers, including analyzer body, the analyzer body includes the shell with detection window and is located at the sample stage of the detection window position;The sample stage has the sample cup bracket of cover buckle at the detection window;The outer edge of the sample cup bracket has downward first flanging, the detection window of the shell has upward second flanging, the first flanging and the second flanging are locked to form labyrinth dustproof structure.The utility model fundamentally blocks the dust of outside into optical path and adheres to optical element surface by designing labyrinth dustproof structure, ensure the cleanness of detection optical path.This makes the near infrared spectrum signal collected avoid the baseline drift and signal-to-noise ratio drop problem caused by dust shielding, scattering, significantly improve the accuracy of component qualitative identification and quantitative analysis.

Description

Technical Field

[0001] This utility model belongs to the field of analytical instrument technology, and relates to an optical analytical instrument for qualitative and quantitative analysis of material composition, specifically a near-infrared spectroscopy analyzer. Background Technology

[0002] Near-infrared spectroscopy is an analytical method based on the selective absorption of electromagnetic radiation in the near-infrared region (wavelengths typically between 780 nm and 2500 nm) by molecules. As a highly efficient, convenient, and non-destructive testing method, it has been widely applied in numerous industrial fields, including food, agriculture, chemicals, pharmaceuticals, and textiles. This technique leverages the characteristic absorption peaks of different organic components in a sample (such as moisture, fats, proteins, amino acids, and textile fiber blends) in the near-infrared band. By analyzing the position and intensity of the absorption spectra, qualitative and quantitative identification of sample components can be achieved.

[0003] In the field of textile testing, near-infrared spectroscopy analyzers can quickly determine important parameters such as fiber type, blending ratio, and content of various chemical auxiliaries by collecting the diffuse reflectance spectrum of the sample surface, providing key data support for product quality control and process optimization.

[0004] However, existing near-infrared spectroscopy analysis equipment still has certain problems in practical use: during instrument operation, static electricity easily accumulates in the electronic circuits, causing dust particles floating in the environment to adsorb onto the surface of optical components. After contaminants adhere to the surface of optical components (such as optical windows, lenses, or mirrors), they will cause scattering, obstruction, or attenuation of the incident light path, resulting in spectral baseline drift, decreased signal-to-noise ratio, and increased detection deviation, seriously affecting the accuracy and stability of the detection results.

[0005] Therefore, there is an urgent need for a dustproof structure that can effectively block dust from entering the optical path and improve the working environment of optical components, so as to enhance the reliability and detection accuracy of near-infrared spectrometers in complex industrial environments. Utility Model Content

[0006] To address the aforementioned shortcomings in existing technologies, this utility model aims to provide a near-infrared spectroscopy analyzer that effectively blocks dust from entering the optical path, improves the working environment of optical components, and thereby enhances the reliability and detection accuracy of the near-infrared spectroscopy analyzer in complex industrial environments.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a near-infrared spectroscopy analyzer, comprising an analyzer body, the analyzer body comprising a housing with a detection window and a sample stage disposed at the position of the detection window; the sample stage having a sample cup holder with a cover fastened to the detection window; the outer edge of the sample cup holder having a downward first flange, and the detection window of the housing having an upward second flange, the first flange and the second flange interlocking to form a labyrinth-type dustproof structure.

[0008] As a limitation of this utility model, the sample cup holder has a groove for placing a standard-sized sample cup.

[0009] As another limitation of this utility model, the sample stage is rotatably mounted on the integrating sphere support frame of the analyzer body; it also includes a motor disposed in the housing, the motor being drivenly connected to the sample stage to drive the sample stage to rotate.

[0010] As a further limitation of this utility model, the sample stage also includes a bearing and a chopper; the inner ring of the bearing is connected to the integrating sphere support frame, and the outer ring of the bearing is connected to the chopper; The chopper has a light-transmitting window. When the light-transmitting window coincides with the emission port of the integrating sphere support, a light path is formed so that the light source illuminates the sample on the detection window.

[0011] As a further limitation of this utility model, the gap between the inner ring of the bearing and the integrating ball support frame is filled with a dustproof block.

[0012] As a further definition of this utility model, the light-transmitting window is a semi-circular through hole opened on the light chopper, and the semi-circular through hole is covered with a quartz plate.

[0013] As a further limitation of this utility model, the light chopper includes an upper ring structure, a lower ring structure, and a light chopper blade. The upper ring structure and the lower ring structure are assembled and fixed on the bearing by axially clamping the outer ring of the bearing. The light chopper blade is fixed on the upper ring structure.

[0014] As a further limitation of this utility model, a dustproof ring is provided at the joint between the upper ring structure and the lower ring structure.

[0015] As a further limitation of this utility model, a Hall sensor is provided on the integrating sphere support frame, and the Hall sensor faces the lower ring structure; a sensing post is embedded in the lower ring structure, and the sensing post corresponds to the Hall sensor.

[0016] By adopting the above-mentioned technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows: (1) By designing a labyrinthine dustproof structure, this utility model fundamentally blocks external dust from entering the optical path and adhering to the surface of the optical elements, ensuring the cleanliness of the detection optical path. This avoids baseline drift and signal-to-noise ratio reduction caused by dust obstruction and scattering in the acquired near-infrared spectral signals, significantly improving the accuracy of qualitative identification and quantitative analysis of components.

[0017] (2) By setting sealing elements such as dustproof blocks and dustproof rings in key parts, this utility model effectively blocks the migration and diffusion of internal dust that has been electrostatically adsorbed to the core optical element area, thus cutting off the transmission path of pollution from a physical structure perspective.

[0018] (3) The dustproof solution adopted in this utility model is mainly based on mechanical structure innovation. It does not require changes to the core design of the existing optical system, nor does it require the addition of a complex electrical dust removal system. It is simple to implement and highly reliable. At the same time, the instrument performance degradation caused by dust intrusion and the need for cleaning optical components are greatly reduced, thus reducing the long-term maintenance costs for users.

[0019] In summary, this utility model, through a series of innovative physical dustproof designs, works synergistically to provide a highly clean and stable working environment for the optical system of the near-infrared spectroscopy analyzer, fundamentally solving the industry pain point of decreased measurement accuracy due to dust contamination. It is particularly suitable for industrial field applications with stringent requirements for detection reliability. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the sample cup holder after disassembly according to an embodiment of the present invention; Figure 3 This is a cross-sectional structural diagram of an embodiment of the present utility model; Figure 4 This is a schematic diagram of the outer shell in an embodiment of the present utility model; Figure 5 This is a schematic diagram of the structure after removing the outer shell in an embodiment of this utility model; Figure 6 This is a structural schematic diagram of an embodiment of the present invention from another angle after the outer shell has been removed; Figure 7 This is a schematic diagram of the installation structure of the sample stage on the integrating sphere support frame in an embodiment of this utility model; Figure 8 This is a schematic diagram of the disassembled structure of the sample stage in an embodiment of the present invention; Figure 9This is a schematic diagram of the bearing mounting structure on the integrating ball support frame in an embodiment of this utility model; Figure 10 This is a schematic diagram of the disassembled structure of the chopper in an embodiment of the present invention; In the diagram: 1. Housing; 2. Detection window; 3. Sample stage; 4. Integrating sphere support frame; 5. Motor; 6. Hall sensor; 101. Second flip; 201. Sample cup holder; 202. Bearing; 203. Cutter; 204. First flange; 205. Dustproof block; 206. Upper ring structure; 207. Lower ring structure; 208. Cutter blade; 209. Raised edge; 210. Dustproof ring; 211. Light transmission window; 301. Ejection port. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0023] This embodiment is an improvement on the existing near-infrared spectrometer. Specifically, the dustproof structure of the sample stage 3 has been improved, which can effectively block dust from entering the optical path, thereby improving the reliability and detection accuracy of the near-infrared spectrometer in complex industrial environments.

[0024] This embodiment includes an analyzer body. The structure of the analyzer body is basically the same as that of the near-infrared spectroscopy analyzer in the prior art. The only difference is the sample stage 3 and the dustproof structure of the sample stage 3. Therefore, apart from the sample stage 3 and the dustproof structure of the sample stage 3, the other components of the analyzer body will not be described in detail in this embodiment.

[0025] The analyzer body includes a housing 1 with a detection window 2, a sample stage 3 located at the position of the detection window 2, and an integrating sphere support 4 located inside the housing 1 and below the detection window 2. Figure 4 As shown, the detection window 2 of the outer casing 1 has a circular hole structure, and the edge of the circular hole forms an upward-facing second flange 101. Figures 5 to 7 As shown, the sample stage 3 is rotatably mounted on the integrating sphere support frame 4, and the sample stage 3 has a channel communicating with the emission port 301 of the integrating sphere support frame 4 to form an optical path for the analyzer body. The light source can irradiate the sample on the sample stage 3 through this optical path. To drive the sample stage 3 to rotate at a uniform speed, a motor 5 that is driven and connected to the sample stage 3 is also provided inside the outer casing 1 in this embodiment. Depending on the actual situation, the motor 5 can be driven and connected to the sample stage 3 through a synchronous belt, belt, or gear.

[0026] Furthermore, the sample stage 3 includes a sample cup holder 201, a bearing 202, and a chopper 203. The sample cup holder 201 has a precisely machined groove for placing standard-sized sample cups (commonly 30mm in diameter and 10mm in height). Figures 1 to 3 As shown, the sample cup holder 201 is fastened to the detection window 2 of the outer casing 1, and the outer edge of the sample cup holder 201 has a downward-facing first flange 204, which interlocks with the second flange 101 at the detection window 2 to form a labyrinth-style dustproof structure. This labyrinth-style dustproof structure can block external dust from entering the light path without affecting the rotation of the sample cup holder 201 relative to the outer casing 1 (i.e., the detection window 2).

[0027] Bearing 202 is the core component used to achieve the rotation of sample stage 3, such as Figure 8 and Figure 9 As shown, the inner ring of the bearing 202 is fitted onto the emission port 301 of the integrating sphere support frame 4 and is fixedly connected to the integrating sphere support frame 4. In this embodiment, to prevent dust inside the housing 1 from migrating and spreading into the light path area, a dustproof block 205 is filled in the gap between the inner ring of the bearing 202 and the integrating sphere support frame 4.

[0028] The chopper 203 is mounted on the outer ring of the bearing 202 and rotates under the drive of the motor 5. It converts a stable DC optical signal into a specific frequency AC optical signal, similar to a high-speed, precision rotary shutter. Figure 8 and Figure 10 As shown, the chopper 203 includes an upper ring structure 206, a lower ring structure 207, and a chopper blade 208. The inner diameters of both the upper ring structure 206 and the lower ring structure 207 are larger than the outer ring of the bearing 202. Both the top inner edge of the upper ring structure 206 and the bottom inner edge of the lower ring structure 207 are provided with a raised edge 209. When the upper ring structure 206 and the lower ring structure 207 axially clamp the outer ring of the bearing 202, and are connected by screws, the raised edge 209 of the upper ring structure 206 abuts against the upper surface of the bearing 202, and the raised edge 209 of the lower ring structure 207 abuts against the lower surface of the bearing 202, so that the upper ring structure 206 and the lower ring structure 207 can be clamped onto the outer ring of the bearing 202. Figure 7 and Figure 8 As shown, to prevent dust inside the outer casing 1 from migrating and spreading into the light path area, a dustproof ring 210 is provided at the seam between the upper ring structure 206 and the lower ring structure 207. The light-cutter 208 is made of a lightweight and hard metal (such as anodized aluminum) or a black-coated composite material to ensure maximum light absorption rather than reflection. Figure 10 As shown, the light-cutter 208 is fixed on the upper ring structure 206. A semi-circular through hole is opened on the light-cutter 208, and a quartz plate is covered at the semi-circular through hole. The semi-circular through hole forms the light-transmitting window 211 of the light-cutter 203.

[0029] It should be noted that in this embodiment, the motor 5 is connected to the chopper 203 via a belt, and the sample cup holder 201 is fixedly connected to the upper ring structure 206 by screws so as to rotate synchronously with the chopper 203. During operation, the motor 5 drives the chopper 203 to rotate, so that the light transmission window 211 of the chopper 203 coincides with or separates from the emission port 301 of the integrating sphere support frame 4 at a fixed frequency. When the light transmission window 211 coincides with the emission port 301 of the integrating sphere support frame 4, the light source emitted from the emission port 301 of the integrating sphere support frame 4 will illuminate the sample on the sample cup holder 201.

[0030] Furthermore, such as Figure 6 As shown, in this embodiment, a Hall sensor 6 is also installed on the integrating sphere support frame 4, with the Hall sensor 6 facing the bottom surface of the lower ring structure 207. Correspondingly, a sensing post is embedded at a certain point on the bottom surface of the lower ring structure 207. During operation, for each rotation of the chopper 203, the sensing post passes the Hall sensor 6 once, and the Hall sensor 6 generates an electrical pulse signal. This electrical pulse signal marks the starting phase of the rotation of the chopper 203.

[0031] It should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A near-infrared spectroscopy analyzer, comprising an analyzer body, the analyzer body including a housing having a detection window and a sample stage disposed at the location of the detection window; characterized in that: The sample stage has a sample cup holder that is covered by the detection window; the outer edge of the sample cup holder has a downward first flange, and the detection window of the outer shell has an upward second flange, the first flange and the second flange interlock to form a labyrinth-style dustproof structure.

2. The near-infrared spectrometer according to claim 1, characterized in that: The sample cup holder has a groove for placing standard-sized sample cups.

3. The near-infrared spectrometer according to claim 1 or 2, characterized in that: The sample stage is rotatably mounted on the integrating sphere support frame of the analyzer body; it also includes a motor located in the housing, which is connected to the sample stage to drive the sample stage to rotate.

4. The near-infrared spectrometer according to claim 3, characterized in that: The sample stage also includes a bearing and a chopper; the inner ring of the bearing is connected to the integrating sphere support frame, and the outer ring of the bearing is connected to the chopper; The chopper has a light-transmitting window. When the light-transmitting window coincides with the emission port of the integrating sphere support, a light path is formed so that the light source illuminates the sample on the detection window.

5. The near-infrared spectrometer according to claim 4, characterized in that: The gap between the inner ring of the bearing and the integrating ball support frame is filled with dustproof blocks.

6. The near-infrared spectroscopy analyzer according to claim 4 or 5, characterized in that: The light-transmitting window is a semi-circular through-hole opened on the light chopper, and a quartz plate is covered at the semi-circular through-hole.

7. The near-infrared spectroscopy analyzer according to claim 6, characterized in that: The light chopper includes an upper ring structure, a lower ring structure, and a light chopper blade. The upper ring structure and the lower ring structure are assembled and fixed on the bearing by axially clamping the outer ring of the bearing. The light chopper blade is fixed on the upper ring structure.

8. The near-infrared spectrometer according to claim 7, characterized in that: A dustproof ring is provided at the seam between the upper ring structure and the lower ring structure.

9. The near-infrared spectrometer according to claim 8, characterized in that: A Hall sensor is provided on the integrating sphere support frame, and the Hall sensor faces the lower ring structure; a sensing post is embedded in the lower ring structure, and the sensing post corresponds to the Hall sensor.

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