A high signal-to-noise ratio Fourier infrared spectrum measuring instrument

Abstract

This invention discloses a high signal-to-noise ratio Fourier transform infrared spectrometer, belonging to the technical field of infrared spectrometers. It includes a main body with an electrically operated telescopic rod on its upper surface, and a fixed plate and an indicator rod fixedly connected to the upper surface of the main body. The indicator rod is movably mounted on the upper surface of the connecting plate via a swing assembly. During the docking of the measurement probe, the positioning hole is inserted into the positioning rod, allowing the measurement probe to enter the inner rod. Finally, the top plate presses down on the circular plate, making installation quick and convenient. During disassembly, the lower connecting rod directly pushes the top plate, removing it from the circular plate, allowing the measurement probe to be removed. When the measurement probe is installed, the indicator rod rotates to the sides; when the measurement probe is disassembled, the indicator rod rotates upwards, serving as an action indicator. This action indicator directly verifies the physical positioning, avoiding misjudgments caused by circuit faults and is more reliable than an electrical indication.

Description

Technical Field

[0001] This invention relates to the field of infrared spectroscopy measurement technology, specifically to a high signal-to-noise ratio Fourier transform infrared spectroscopy measurement instrument. Background Technology

[0002] The core function of infrared spectroscopy is to identify the chemical composition and molecular structure of substances. It generates molecular spectra by analyzing the characteristic absorption of infrared light by a sample, thereby accurately identifying the material composition (such as plastics and pharmaceuticals) and detecting trace impurities or aging products. This technology is applicable to solid, liquid, and gas analysis, and features high signal-to-noise ratio, rapid scanning, and non-destructive detection. It is a key analytical tool in materials science, chemical quality inspection, and environmental monitoring. For example, Chinese utility model patent application number 202222298645.0, filed on August 31, 2022, describes an infrared spectroscopy instrument for pesticide residue detection. During use, rotating components bring fruits and vegetables into the detection range. The detector is positioned directly below the instrument for quick and easy alignment. The adjustable components ensure the detector is at a suitable height for detecting fruits and vegetables. Rotating the components allows the detector to rotate the fruits and vegetables, enabling comprehensive detection and avoiding the problem of inaccurate results caused by focusing on only one area. Furthermore, Chinese utility model patent application number 202120893727.2, filed on April 26, 2021, describes a near-infrared spectral measuring device for monitoring total phosphorus and total nitrogen content in sewage. This device effectively solves the problem of the monitoring lamp head becoming contaminated and difficult to clean after monitoring nitrogen and phosphorus content in sewage using current infrared spectroscopy instruments. The workflow for using a Fourier transform infrared spectroscopy (FTIR) instrument is as follows: probe installation - crystal cleaning - background acquisition - sample placement - sample measurement. Probe installation is the first physical prerequisite in the entire process. However, during use, due to the need to frequently switch between different sampling accessories or to prevent dust contamination and physical damage during long-term idle periods, the probe needs to be removed. If there is no efficient physical indication structure to promptly inform the operator of the probe installation status, it will lead to errors in the operator's workflow. Directly acquiring the background will result in completely incorrect spectral data, while cleaning the workpiece first can easily cause secondary contamination and waste time, making it impossible to obtain accurate detection results. Summary of the Invention

[0003] The purpose of this invention is to provide a high signal-to-noise ratio Fourier transform infrared spectroscopy measuring instrument to solve the problems mentioned in the background art, such as the lack of an efficient physical indication structure to promptly inform the probe installation status, which leads to errors in the operator's workflow, direct background acquisition resulting in completely erroneous spectral data, and the risk of secondary contamination and wasted time if the workpiece is cleaned first, all of which prevent the acquisition of accurate detection results.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high signal-to-noise ratio Fourier transform infrared spectroscopy measuring instrument, comprising a body, an electric telescopic rod disposed on the upper surface of the body, a fixed plate fixedly connected to the upper surface of the body, and a material plate for placing the workpiece to be measured fixedly connected to the upper surface of the body; a connecting plate fixedly connected to the output end of the electric telescopic rod, an inner rod fixedly connected to the inner wall of the connecting plate, and a measuring probe engaged with the lower surface of the inner rod, and a circular plate fixedly connected to the surface of the measuring probe; a top plate, which is movably connected to the inner rod through a reversing assembly, and presses down the circular plate when the top plate is working; an inner connecting plate, which is fixedly connected to the back of the inner rod, and an air bladder is bonded to the upper surface of the inner connecting plate, and the air bladder contains anhydrous ethanol, and a spray pipe is fixedly connected to the lower surface of the air bladder, which sprays anhydrous ethanol toward the measuring probe when working; and an indicator rod, which is movably disposed on the upper surface of the connecting plate through a swing assembly, and when working, the indicator rod serves as a position indicator, informing the installation status of the measuring probe.

[0005] Preferably, a positioning rod is fixedly connected to the lower surface of the inner rod, and the surface of the circular plate is provided with positioning holes corresponding to the positioning rods.

[0006] Preferably, the reversing assembly includes a crossbar fixedly connected to the surface of the inner rod, and the top plate is slidably disposed on the surface of the crossbar, and the front of the top plate is an inverted "L" structure. In addition, a limit plate is fixedly connected to the end of the crossbar, and the lower surface of the top plate is inclined.

[0007] Preferably, a limiting plate is fixedly connected to the surface of the crossbar, and a spring shock absorber is fixedly connected to the surface of the limiting plate. The other side of the spring shock absorber is fixedly connected to the surface of the inner rod. In addition, the middle part of the crossbar is convex.

[0008] Preferably, an auxiliary plate is fixedly connected to the upper surface of the top plate, and the upper surface of the auxiliary plate is inclined. The left side of the fixed plate is an inverted "L" structure, and a lower connecting rod is fixedly connected to the lower surface of the fixed plate. When the lower connecting rod is working, it pushes the inclined surface of the auxiliary plate.

[0009] Preferably, a feed tube is fixedly connected to both the left and right sides of the airbag, and a one-way valve is fixedly connected to both the surface of the feed tube and the surface of the spray tube.

[0010] Preferably, a push rod is slidably disposed inside the inner rod, and a force plate is fixedly connected to the lower surface of the push rod. Magnets are fixedly connected inside both the force plate and the measuring probe, and the magnetic poles of adjacent magnets are opposite.

[0011] Preferably, both sides of the push rod are fixedly connected to sliders, and the sliders are slidably disposed inside the inner rod. A return spring is fixedly connected to the upper surface of the slider, and the other side of the return spring is fixedly connected to the inner wall of the inner rod.

[0012] Preferably, the swing assembly includes a long pin fixedly connected to the upper surface of the push rod, and a guide rod is fixedly connected to the end of the long pin, and the guide rods are symmetrically distributed on both sides of the long pin.

[0013] Preferably, an upper connecting plate is fixedly connected to the upper surface of the connecting plate, and a rotating shaft is rotatably provided inside the upper connecting plate. The indicator rod is fixedly connected to the surface of the rotating shaft. In addition, an inner groove corresponding to the guide rod is opened on the surface of the indicator rod.

[0014] Compared with existing technologies, the advantages of this invention are as follows: Employing a novel structural design, during the docking of the measuring probe, the positioning hole is inserted into the positioning rod, allowing the measuring probe to enter the inner rod. Finally, the top plate presses down on the circular plate, making installation quick and convenient. During disassembly, the lower connecting rod directly pushes the top plate, removing it from the circular plate and allowing the measuring probe to be removed. When the measuring probe is installed, the indicator rod rotates to both sides; when the measuring probe is disassembled, the indicator rod rotates upwards, serving as an action indicator. This action indicator directly verifies physical positioning, avoiding misjudgments caused by circuit faults, and is more reliable than a live indicator. The specific details are as follows: (1) In the process of docking the measuring probe, the positioning hole is inserted into the positioning rod so that the measuring probe can enter the inner rod. Finally, the top plate will press against the circular plate. During this process, the push rod rises inside the inner rod, and the indicator rod rotates outward around the rotating shaft under its own gravity, which plays the role of indicating the installation of the measuring probe.

[0015] Furthermore, during disassembly, the electric telescopic rod drives the inner rod upward, bringing the auxiliary plate closer to the lower connecting rod. The lower connecting rod then directly pushes the top plate, preventing it from pressing against the circular plate. This allows the measuring probe to be removed for maintenance or replacement. During this process, the push rod descends under the action of the slider and the return spring. At this time, the indicator rod rotates upward under the action of the guide rod and the inner groove, indicating that the measuring probe has not been installed. This ensures that when operators perform subsequent operations, they strictly follow the installation procedure, installing the measuring probe first without performing other operations.

[0016] (2) During operation, when the electric telescopic rod drives the inner rod and the measuring probe to rise, the inner rod will drive the inner plate to rise synchronously. At this time, the inner plate will squeeze the air bag, and then the air bag will spray anhydrous ethanol through the spray pipe. Anhydrous ethanol is a highly volatile solvent. Its function is to dissolve and physically remove non-polar residues such as fingerprints and oil stains on the surface of the workpiece, ATR crystal and sample stage. By rapidly evaporating and carrying away pollutants, it ensures that the infrared light signal comes only from the sample body and avoids the additional absorption peaks generated by the molecular bond vibration of the residue, thereby ensuring the authenticity and accuracy of the spectral data.

[0017] Furthermore, when the airbag is initially compressed, the auxiliary plate and the lower connecting rod have not yet come into contact. Then, the electric telescopic rod with the inner rod is lowered, so that the airbag is not compressed. At this time, the airbag inflates by drawing air through the feeding pipe, which facilitates the next use of the airbag. During the operation of the airbag, the one-way valve ensures that the flow direction of anhydrous ethanol is from the feeding pipe to the spray pipe, and no backflow will occur.

[0018] (3) In the process of docking the measurement probe, the magnet and positioning rod of the high signal-to-noise ratio Fourier transform infrared spectrometer play an initial positioning role, which increases the stability of the docking measurement probe. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the connection structure between the body and the electric telescopic rod of the present invention; Figure 2 This is a schematic diagram of the connection structure between the electric telescopic rod and the connecting plate of the present invention; Figure 3 This is a schematic diagram of the connection structure between the inner rod and the cross rod of the present invention; Figure 4 This is a schematic diagram of the connection structure between the measuring probe and the circular plate of the present invention; Figure 5 This is a schematic diagram of the connection structure between the inner rod and the inner connecting plate of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 For the present invention Figure 2 Enlarged structural diagram at point B; Figure 8 This is a schematic diagram of the connection structure between the inner plate and the airbag in this invention; Figure 9 This is a schematic diagram of the internal rod in a cross-sectional state according to the present invention; Figure 10 This is a schematic diagram of the magnet distribution structure of the present invention; Figure 11 This is a schematic diagram of the working state structure of the indicator rod of the present invention; Figure 12 For the present invention Figure 11 Enlarged structural diagram at point C.

[0020] In the diagram: 1. Machine body; 2. Electric telescopic rod; 3. Fixed plate; 4. Material plate; 5. Connecting plate; 6. Inner rod; 7. Measuring probe; 8. Positioning rod; 9. Crossbar; 10. Top plate; 11. Limiting plate; 12. Push rod; 13. Circular plate; 14. Spring shock absorber; 15. Inner connecting plate; 16. Lower connecting rod; 17. Airbag; 18. Feeding pipe; 19. Spraying pipe; 20. Force plate; 21. Slider; 22. Return spring; 23. Upper connecting plate; 24. Long pin; 25. Magnet; 26. Indicator rod; 27. Guide rod; 28. Inner groove; 29. ​​Rotating shaft; 30. Auxiliary plate. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The present invention provides the following technical solution: a high signal-to-noise ratio Fourier transform infrared spectrometer.

[0023] Example 1: Please refer to Figures 1-12 The device includes a body 1, an electric telescopic rod 2 on the upper surface of the body 1, a fixed plate 3 fixedly connected to the upper surface of the body 1, and a material plate 4 for placing the workpiece to be measured fixedly connected to the upper surface of the body 1; a connecting plate 5 is fixedly connected to the output end of the electric telescopic rod 2, an inner rod 6 is fixedly connected to the inner wall of the connecting plate 5, and a measuring probe 7 is engaged with the lower surface of the inner rod 6.

[0024] Specifically, the instrument 1 achieves a high signal-to-noise ratio through a high-throughput interferometer design, a high-sensitivity detector, and multiple scan accumulation technology. At the same time, nitrogen purging removes water vapor and carbon dioxide interference, and high-precision analog-to-digital conversion and digital filtering algorithms effectively suppress electronic and optical noise, extract weak signals, and ensure a flat spectral baseline and clear peak shape, significantly improving the accuracy and repeatability of qualitative and quantitative analysis. During the detection process, the workpiece is placed on the material plate 4, and the electric telescopic rod 2 drives the measuring probe 7 to hold the workpiece in place, completing the infrared measurement.

[0025] The top plate 10 is movably connected to the inner rod 6 via a reversing assembly, and the top plate 10 presses against the circular plate 13 when it is working. The reversing assembly includes a crossbar 9 fixedly connected to the surface of the inner rod 6, and the top plate 10 is slidably disposed on the surface of the crossbar 9. The front of the top plate 10 is an inverted "L" structure. In addition, a limit plate 11 is fixedly connected to the end of the crossbar 9, and the lower surface of the top plate 10 is inclined. The circular plate 13 is fixedly connected to the surface of the measuring probe 7. A positioning rod 8 is fixedly connected to the lower surface of the inner rod 6. The circular plate 13 has positioning holes that correspond one-to-one with the positioning rod 8 on its surface.

[0026] Specifically, during the docking of the measuring probe 7, the positioning hole on the surface of the circular plate 13 is inserted into the positioning rod 8. During this process, the circular plate 13 pushes the top plate 10, causing the top plate 10 to slide on the surface of the crossbar 9.

[0027] A limiting plate 11 is fixedly connected to the surface of the crossbar 9, and a spring damper 14 is fixedly connected to the surface of the limiting plate 11. The other side of the spring damper 14 is fixedly connected to the surface of the inner rod 6. In addition, the middle part of the crossbar 9 is protruding.

[0028] Specifically, when the top plate 10 slides on the surface of the crossbar 9, it will cooperate with the limiting plate 11 to compress the spring damper 14. After the measuring probe 7 is connected to the inside of the inner rod 6, the circular plate 13 no longer pushes the top plate 10. At this time, the top plate 10 moves back under the action of the spring damper 14. The middle part of the crossbar 9 is convex, and the convex position of the crossbar 9 restricts the movement distance of the top plate 10, so that the top plate 10 can stably press the circular plate 13. At this time, the circular plate 13 and the measuring probe 7 are stably installed.

[0029] An auxiliary plate 30 is fixedly connected to the upper surface of the top plate 10, and the upper surface of the auxiliary plate 30 is inclined. The left side of the fixed plate 3 is an inverted "L" structure, and a lower connecting rod 16 is fixedly connected to the lower surface of the fixed plate 3. When the lower connecting rod 16 is working, it pushes the inclined surface of the auxiliary plate 30.

[0030] Specifically, when it is necessary to remove the measuring probe 7, the electric telescopic rod 2 drives the connecting plate 5 and the inner rod 6 to rise. At this time, the auxiliary plate 30 will approach the lower connecting rod 16, and then the lower connecting rod 16 will push the inclined surface of the auxiliary plate 30. At this time, the auxiliary plate 30 drives the top plate 10 to slide on the surface of the crossbar 9, so that the top plate 10 no longer presses against the circular plate 13, and then the measuring probe 7 can be removed.

[0031] An inner plate 15 is fixedly connected to the back of the inner rod 6, and an airbag 17 is bonded to the upper surface of the inner plate 15. The airbag 17 contains anhydrous ethanol. In addition, a spray pipe 19 is fixedly connected to the lower surface of the airbag 17. When the spray pipe 19 is working, it sprays anhydrous ethanol onto the measuring probe 7. A feed pipe 18 is fixedly connected to both the left and right sides of the airbag 17, and a one-way valve is fixedly connected to the surface of the feed pipe 18 and the surface of the spray pipe 19.

[0032] Specifically, when the inner rod 6 rises, it drives the inner connecting plate 15 to rise synchronously. At this time, the inner connecting plate 15 will compress the airbag 17. The airbag 17 sprays anhydrous ethanol through the spray pipe 19. Anhydrous ethanol, as a highly volatile solvent, dissolves and physically removes non-polar residues such as fingerprints and oil stains from the workpiece, ATR crystal, and sample stage surface. When the airbag 17 is not compressed, it inflates by drawing air through the replenishment pipe 18, facilitating its next use. During the operation of the airbag 17... The one-way valve directs the flow of anhydrous ethanol from the feed pipe 18 to the spray pipe 19, preventing backflow. Furthermore, when only the airbag 17 needs to operate and the measuring probe 7 does not need to be disassembled, the height of the inner rod 6 can be controlled so that when the airbag 17 is initially compressed, the auxiliary plate 30 does not contact the lower connecting rod 16. Then, the electric telescopic rod 2 lowers the inner rod 6 and the airbag 17. Only when the measuring probe 7 needs to be disassembled will the inner rod 6 rise to the position where the auxiliary plate 30 contacts the lower connecting rod 16.

[0033] The inner rod 6 has a push rod 12 that slides inside it, and a force plate 20 is fixedly connected to the lower surface of the push rod 12. Magnets 25 are fixedly connected to the inside of the force plate 20 and the inside of the measuring probe 7, and the magnetic poles of adjacent positions of the magnets 25 are opposite.

[0034] Specifically, during the docking of the measuring probe 7, the magnet 25 played an auxiliary positioning role, ensuring stability.

[0035] Both sides of the push rod 12 are fixedly connected to sliders 21, and the sliders 21 are slidably disposed inside the inner rod 6. A return spring 22 is fixedly connected to the upper surface of the slider 21. In addition, the other side of the return spring 22 is fixedly connected to the inner wall of the inner rod 6.

[0036] Specifically, when docking the measuring probe 7, the measuring probe 7 will push the force plate 20, causing the force plate 20 and the push rod 12 to rise inside the inner rod 6. At this time, the slider 21 will move in the direction of squeezing the return spring 22, that is, the return spring 22 stores force. When the measuring probe 7 is disassembled and the top plate 10 no longer presses against the circular plate 13, the push rod 12 and the force plate 20 move outward under the action of the return spring 22, and the push rod 12 and the force plate 20 push the measuring probe 7 out.

[0037] The indicator rod 26 is movably mounted on the upper surface of the connecting plate 5 via a swing assembly. When the indicator rod 26 is working, it serves as a position indicator, informing the installation status of the measuring probe 7. The swing assembly includes a long pin 24 fixedly connected to the upper surface of the push rod 12, and a guide rod 27 is fixedly connected to the end of the long pin 24. The guide rods 27 are symmetrically distributed on both sides of the long pin 24.

[0038] Specifically, during the rising and falling of push rod 12, the long pin 24 and guide rod 27 will move synchronously.

[0039] The upper surface of the connecting plate 5 is fixedly connected to the upper connecting plate 23, and the upper connecting plate 23 is rotatably provided with a rotating shaft 29. The surface of the rotating shaft 29 is fixedly connected to an indicator rod 26. In addition, the surface of the indicator rod 26 is provided with an inner groove 28 corresponding to the guide rod 27.

[0040] Specifically, when push rod 12 rises, it drives guide rod 27 to slide inside inner groove 28. At this time, indicator rod 26 rotates around pivot 29 and moves outward from connecting plate 5. When indicator rod 26 reaches its highest position, it descends, indicating that measuring probe 7 is installed. After measuring probe 7 is removed, when push rod 12 descends under the action of return spring 22, it drives guide rod 27 to descend synchronously. At this time, indicator rod 26 rotates upward under the action of guide rod 27 and inner groove 28, thus rising to its highest position. This serves to indicate that measuring probe 7 is not installed, allowing operators to pay attention to the operating procedures in subsequent operations.

[0041] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0042] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing 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 invention should be included within the protection scope of the present invention.

Claims

1. A high signal-to-noise ratio Fourier transform infrared spectroscopy measuring instrument, comprising a body (1), wherein an electric telescopic rod (2) is provided on the upper surface of the body (1), and a fixing plate (3) is fixedly connected to the upper surface of the body (1), and a material plate (4) for placing the workpiece to be measured is fixedly connected to the upper surface of the body (1). The output end of the electric telescopic rod (2) is fixedly connected to a connecting plate (5), and an inner rod (6) is fixedly connected to the inner wall of the connecting plate (5). A measuring probe (7) is engaged with the lower surface of the inner rod (6). In addition, a circular plate (13) is fixedly connected to the surface of the measuring probe (7). Its features are: The top plate (10) is movably connected to the inner rod (6) via a reversing assembly, and the top plate (10) presses down on the circular plate (13) when it is in operation. An inner plate (15) is fixedly connected to the back of the inner rod (6), and an air bag (17) is bonded to the upper surface of the inner plate (15). The air bag (17) contains anhydrous ethanol. In addition, a spray pipe (19) is fixedly connected to the lower surface of the air bag (17). When the spray pipe (19) is working, it sprays anhydrous ethanol onto the measuring probe (7). The indicator rod (26) is movably mounted on the upper surface of the connecting plate (5) via a swing assembly. When the indicator rod (26) is working, it serves as a position indicator, informing the installation status of the measuring probe (7).

2. The high signal-to-noise ratio Fourier transform infrared spectrometer according to claim 1, characterized in that: The lower surface of the inner rod (6) is fixedly connected to a positioning rod (8), and the surface of the circular plate (13) is provided with positioning holes corresponding to the positioning rods (8).

3. The high signal-to-noise ratio Fourier transform infrared spectrometer according to claim 1, characterized in that: The reversing assembly includes a crossbar (9) fixedly connected to the surface of the inner rod (6), and the top plate (10) is slidably disposed on the surface of the crossbar (9). The front of the top plate (10) is an inverted "L" structure. In addition, a limit plate (11) is fixedly connected to the end of the crossbar (9), and the lower surface of the top plate (10) is inclined.

4. The high signal-to-noise ratio Fourier transform infrared spectrometer according to claim 3, characterized in that: The surface of the crossbar (9) is fixedly connected to a limiting plate (11), and the surface of the limiting plate (11) is fixedly connected to a spring damper (14). The other side of the spring damper (14) is fixedly connected to the surface of the inner rod (6). In addition, the middle part of the crossbar (9) is protruding.

5. The high signal-to-noise ratio Fourier transform infrared spectrometer according to claim 1, characterized in that: An auxiliary plate (30) is fixedly connected to the upper surface of the top plate (10), and the upper surface of the auxiliary plate (30) is inclined. The left side of the fixed plate (3) is an inverted "L" structure, and a lower connecting rod (16) is fixedly connected to the lower surface of the fixed plate (3). When the lower connecting rod (16) is working, it pushes the inclined surface of the auxiliary plate (30).

6. The high signal-to-noise ratio Fourier transform infrared spectrometer according to claim 1, characterized in that: The airbag (17) is fixedly connected to the left and right sides with a feeding pipe (18), and the surface of the feeding pipe (18) and the surface of the spray pipe (19) are fixedly connected with a one-way valve.

7. A high signal-to-noise ratio Fourier transform infrared spectrometer according to claim 1, characterized in that: The inner rod (6) has a push rod (12) slidably disposed inside, and a force plate (20) is fixedly connected to the lower surface of the push rod (12). Magnets (25) are fixedly connected to the inside of the force plate (20) and the inside of the measuring probe (7), and the magnetic poles of adjacent positions of the magnets (25) are opposite.

8. A high signal-to-noise ratio Fourier transform infrared spectrometer according to claim 7, characterized in that: Both sides of the push rod (12) are fixedly connected to sliders (21), and the sliders (21) are slidably disposed inside the inner rod (6). A return spring (22) is fixedly connected to the upper surface of the slider (21). In addition, the other side of the return spring (22) is fixedly connected to the inner wall of the inner rod (6).

9. A high signal-to-noise ratio Fourier transform infrared spectrometer according to claim 7, characterized in that: The swing assembly includes a long pin (24) fixedly connected to the upper surface of the push rod (12), and a guide rod (27) is fixedly connected to the end of the long pin (24), and the guide rod (27) is symmetrically distributed on both sides of the long pin (24).

10. A high signal-to-noise ratio Fourier transform infrared spectrometer according to claim 9, characterized in that: The upper surface of the connecting plate (5) is fixedly connected to the upper connecting plate (23), and the upper connecting plate (23) is rotatably provided with a rotating shaft (29), and the surface of the rotating shaft (29) is fixedly connected to the indicator rod (26). In addition, the surface of the indicator rod (26) is provided with an inner groove (28) corresponding to the guide rod (27).

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