Long-path optical absorption cell with low temperature drift and high stability

Abstract

The application discloses a long-range optical absorption cell with low temperature drift and high stability, which comprises a quartz glass cavity, a fixed frame fixedly connected to the quartz glass cavity, first sealing plates and second sealing plates arranged on left and right sides of the quartz glass cavity, the first sealing plates and the second sealing plates being connected to the fixed frame, a sealing mechanism arranged on the fixed frame, a multistage driving mechanism arranged in the quartz glass cavity, and an incident spherical mirror arranged at the top of the multistage driving mechanism; the first rack and the second rack impact the limiting block in a staggered mode by rotating the first rotating rod, so that the rotating column rotates, the rotating column drives the incident spherical mirror to rotate, the placing angle of the incident spherical mirror is changed, the optical path is indirectly changed, different gases can be used, and the rotating column rotates at the same time, the driving wheel drives the connecting pipe to move up and down, the connecting pipe moves up and down, the connecting pipe drives the incident spherical mirror to move up and down, the placing position of the incident spherical mirror is further changed, and the optical path is changed.

Description

Technical Field

[0001] This invention relates to the field of absorption cells, and more particularly to a long-range optical absorption cell with low temperature drift and high stability. Background Technology

[0002] An absorption cell is a special container used in the laboratory to hold samples for optical property analysis. Most of them are made of quartz, which has low ultraviolet absorption. Long-range optical absorption cells are a means of increasing the optical path of gas absorption in spectroscopy. Long-range optical absorption cells increase the optical path of gas absorption by making the light beam reflect back and forth multiple times in the absorption cell. They are often used in industrial measurement of effective gas detection methods.

[0003] However, once the existing long-range optical absorption cell is manufactured, its structure is fixed and the orientation of the incident spherical mirror cannot be changed, resulting in a fixed optical path. Due to the fixed optical path, the best analytical results cannot be obtained for the spectral analysis of gases with different absorption line intensities. Furthermore, due to the fixed structure, it is also very inconvenient to replace the incident spherical mirror. Summary of the Invention

[0004] The purpose of this invention is to provide a long-range optical absorption cell with low temperature drift and high stability to solve the above-mentioned technical problems.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A long-range optical absorption cell with low temperature drift and high stability includes a quartz glass cavity. Fixed frames are fixedly connected to both ends of the quartz glass cavity. A first sealing plate and a second sealing plate are provided on both sides of the quartz glass cavity. The first sealing plate and the second sealing plate are respectively connected to the two fixed frames by screws and nuts. A sealing mechanism is fixedly connected to the fixed frame. A multi-stage driving mechanism is provided inside the quartz glass cavity. An incident spherical mirror is provided on the top of the multi-stage driving mechanism.

[0007] The multi-stage drive mechanism is used to adjust the placement angle of the incident spherical mirror, thereby changing the optical path by changing the placement angle of the incident spherical mirror.

[0008] The sealing mechanism is used to seal the connection between the fixed frame and the first sealing plate and the second sealing plate.

[0009] Preferably, the multi-stage drive mechanism includes a fixed plate, which is fixedly connected to the quartz glass cavity. A first gear is rotatably connected to the fixed plate, and a first rack and a second rack are meshed on the first gear. Multiple sliding frames are provided on both the front and rear sides of the first gear, and the sliding frames are fixedly connected to the fixed plate. Multiple sliding wheels are rotatably connected to the bottom of the first rack and the second rack, and the sliding wheels are located inside the sliding frames and slidably connected to the sliding frames. A power component is provided through the fixed plate.

[0010] Preferably, the power assembly includes a first rotating rod that passes through a fixed plate and extends to the bottom of a quartz glass cavity. The first rotating rod is rotatably connected to the fixed plate and the quartz glass cavity. A plurality of fixed blocks are connected to a toggle frame on the first rack. A rotating wheel is slidably connected inside the toggle frame. A rotating plate is rotatably connected to the rotating wheel. The rotating plate is fixedly connected to the first rotating rod.

[0011] Preferably, a toggle assembly is fixedly connected to the fixing plate, and the toggle assembly is fixedly connected to the incident spherical mirror;

[0012] The actuation component is used to control the up-and-down movement of the incident spherical mirror.

[0013] Preferably, the first sealing plate is equipped with a quick-connect interface for an air inlet, and the second sealing plate is equipped with a quick-connect interface for an air outlet.

[0014] Preferably, a first optical window is fixedly connected to the first sealing plate, and a fixing tube is provided through the second sealing plate. A second optical window is fixedly connected to one end of the fixing tube, and an exiting spherical mirror is fixedly connected to the other end of the fixing tube.

[0015] The beneficial effects of this invention are:

[0016] 1. This invention rotates the first rotating rod, causing the first and second racks to strike the limiting block in a staggered manner, thereby rotating the rotating column. The rotation of the rotating column drives the incident spherical mirror to rotate, thus changing the placement angle of the incident spherical mirror and indirectly changing the optical path, allowing it to use different gases. At the same time, the rotation of the rotating column also causes the actuating wheel to move the connecting tube up and down, which in turn drives the incident spherical mirror up and down, further changing the placement position of the incident spherical mirror and changing the optical path.

[0017] 2. By setting a sealing element, a first sealing layer, and a second sealing layer, and by making the thin metal plate into a concentric corrugated shape to obtain high contact pressure, and by adding the spring effect of the metal to improve sealing performance, although it is made of metal, it can obtain sufficient sealing function under relatively low tightening pressure. Moreover, the first sealing layer and the second sealing layer made of graphite are set on the outside of the sealing element to further improve the sealing performance. Therefore, even under low torque tightening conditions achieved by fastening means such as bolts, the sealing element exhibits excellent sealing performance. In addition, the compression of the gasket can be set to be large during the tightening process, so the sealing element has good adaptability to the sealing surface.

[0018] 3. Since the first and second sealing plates are connected to the fixed frame by screws and nuts, they are easy to disassemble. The quartz glass cavity can be opened, and by pressing the pressure rod, the pressure rod drives the pressure plate to squeeze the spring, so that the limit block and the pressure plate can return to the inside of the rotating column. Since there is no limit block to limit the movement, the incident spherical mirror can be effectively removed for replacement. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram showing the connection between the second sealing plate and the fixing frame of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the quartz glass cavity of the present invention;

[0022] Figure 4 for Figure 3 Enlarged schematic diagram of part A;

[0023] Figure 5 This is a schematic diagram showing the connection between the fixing plate and the incident spherical mirror of the present invention;

[0024] Figure 6 for Figure 5 Enlarged schematic diagram of part B;

[0025] Figure 7 This is a schematic diagram showing the connection between the exiting spherical mirror and the second optical window of the present invention;

[0026] Figure 8 This is a schematic diagram of the sealing mechanism of the present invention;

[0027] Figure 9 for Figure 8 Enlarged schematic diagram of part C.

[0028] Reference numerals: 1. First sealing plate; 2. First optical window; 3. Screw; 4. Nut; 5. Fixing frame; 6. Quartz glass cavity; 7. Second sealing plate; 8. Quick-connect interface for vent; 9. Fixing tube; 10. Rotating plate; 11. Rotating column; 12. Incident spherical mirror; 13. First gear; 14. First rack; 15. Fixing block; 16. Sliding frame; 17. Sliding wheel; 18. Rotating wheel; 19. Actuating frame; 20. First rotating rod; 21. Rotating plate; 22. Second rack; 23. 24. Fixed plate; 25. Pressure plate; 26. First bevel gear; 27. Second bevel gear; 28. First rotating shaft; 29. ​​Second rotating shaft; 30. Second gear; 31. Inner gear sleeve; 32. Support plate; 33. Actuating wheel; 34. Slide groove; 35. Slider; 36. Spring; 37. Pressure rod; 38. Connecting pipe; 39. Second optical window; 40. Exit spherical mirror; 41. First sealing layer; 42. Second sealing layer; 43. Sealing element; 44. Air inlet quick-connect interface; 45. Limiting block. Detailed Implementation

[0029] To make the technical means, creative features, achieved objectives, and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention.

[0030] Specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0031] Example 1:

[0032] like Figure 1-7 As shown, a long-range optical absorption cell with low temperature drift and high stability includes a quartz glass cavity 6. Fixing frames 5 are fixedly connected to both ends of the quartz glass cavity 6. A first sealing plate 1 and a second sealing plate 7 are provided on both sides of the quartz glass cavity 6. The first sealing plate 1 and the second sealing plate 7 are respectively connected to the two fixing frames 5 by screws 3 and nuts 4. A sealing mechanism is fixedly connected to the fixing frame 5. A multi-stage driving mechanism is provided inside the quartz glass cavity 6. An incident spherical mirror 12 is provided on the top of the multi-stage driving mechanism.

[0033] The multi-stage drive mechanism is used to adjust the placement angle of the incident spherical mirror 12, thereby changing the optical path by changing the placement angle of the incident spherical mirror 12.

[0034] The sealing mechanism is used to seal the connection between the fixed frame 5 and the first sealing plate 1 and the second sealing plate 7;

[0035] The multi-stage drive mechanism includes a fixed plate 23, which is fixedly connected to the quartz glass cavity 6. A first gear 13 is rotatably connected to the fixed plate 23. A first rack 14 and a second rack 22 are meshed on the first gear 13. Multiple sliding frames 16 are provided on both the front and rear sides of the first gear 13. The sliding frames 16 are fixedly connected to the fixed plate 23. Multiple sliding wheels 17 are rotatably connected to the bottom of the first rack 14 and the second rack 22. The sliding wheels 17 are located inside the sliding frames 16 and are slidably connected to the sliding frames 16. A power component is provided through the fixed plate 23.

[0036] The power assembly includes a first rotating rod 20, which passes through a fixed plate 23 and extends to the bottom of a quartz glass cavity 6. The first rotating rod 20 is rotatably connected to the fixed plate 23 and the quartz glass cavity 6. The first rack 14 is connected to a toggle frame 19 via multiple fixed blocks 15. A rotating wheel 18 is slidably connected inside the toggle frame 19. A rotating plate 21 is rotatably connected to the rotating wheel 18. The rotating plate 21 is fixedly connected to the first rotating rod 20.

[0037] When it is necessary to change the position of the incident spherical mirror 12;

[0038] The first rotating rod 20 is rotatable. The first rotating rod 20 will drive the rotating plate 21 to rotate. The rotating plate 21 will drive the wheel to rotate. The rotating wheel 18 will drive the toggle frame 19 to move. The movement of the toggle frame 19 will drive the first rack 14 to move. The movement of the first rack 14 will drive the first gear 13 to rotate. The rotation of the first gear 13 will drive the second gear 29 to move in the opposite direction of the movement of the first rack 14. This will make the second rack 22 move away from the limiting block 44 on the rotating column 11 and make the first rack 14 move closer to the limiting block 44 on the rotating column 11.

[0039] Because a torsion spring is provided at the rotatable connection between the rotating column 11 and the fixed plate 23, the rotating column 11 can return to its original position after each rotation with the help of the torsion spring.

[0040] A toggle assembly is fixedly connected to the fixed plate 23, and the toggle assembly is fixedly connected to the incident spherical mirror 12;

[0041] The toggle assembly is used to control the up and down movement of the incident spherical mirror 12;

[0042] The first sealing plate 1 is equipped with an air inlet quick-connect interface 43, and the second sealing plate 7 is equipped with an air outlet quick-connect interface 8.

[0043] A first optical window 2 is fixedly connected to the first sealing plate 1, and a fixing tube 9 is provided through the second sealing plate 7. A second optical window 38 is fixedly connected to one end of the fixing tube 9, and an exiting spherical mirror 39 is fixedly connected to the other end of the fixing tube 9.

[0044] The actuating assembly includes a rotating column 11, which is rotatably connected to a fixed plate 23. Two limiting blocks 44 are fixedly connected to the rotating column 11. A connecting tube 37 is slidably connected inside the rotating column 11. A rotating plate 10 is fixedly connected to the top of the connecting tube 37. An incident spherical mirror 12 is fixedly connected to the top of the rotating plate 10.

[0045] An inner gear sleeve 30 is fixedly connected inside the rotating column 11. A second gear 29 meshes with the inner gear sleeve 30. A second rotating shaft 28 is provided through the second gear 29. The second rotating shaft 28 is fixedly connected to the second gear 29. The second rotating shaft 28 is rotatably connected to the fixed plate 23. A second bevel gear 26 is fixedly connected to the top of the second rotating shaft 28. A first bevel gear 25 meshes with the second bevel gear 26. A first rotating shaft 27 is fixedly connected to the first bevel gear 25. A turn wheel 32 is fixedly connected to the first rotating shaft 27. A support plate 31 is rotatably connected to the first rotating shaft 27. The support plate 31 is fixedly connected to the fixed plate 23.

[0046] Therefore, when the second rack 22 moves away from the limiting block 44, the rotating column 11 will return to its original state, while the first rack 14 will cause the rotating column 11 to rotate in the opposite direction. The rotation of the rotating column 11 will drive the incident light mirror to rotate, thereby achieving the effect of changing the optical path.

[0047] When the rotating column 11 rotates, it drives the inner gear sleeve 30 to rotate, which in turn drives the second gear 29 to rotate. The second gear 29 then drives the second rotating shaft 28 to rotate. The second rotating shaft 28, through the first bevel gear 25 and the second bevel gear 26, drives the first rotating shaft 27 to rotate. The first rotating shaft 27 then drives the actuating wheel 32 to rotate. The actuating wheel 32 lifts and lowers the connecting tube 37, causing it to move up and down. This up-and-down movement of the connecting tube 37 causes the incident spherical mirror 12 to move up and down, thereby further changing the placement of the incident spherical mirror 12 and altering the optical path.

[0048] Example 2:

[0049] like Figure 8-9 As shown, while all other parts are the same as in Embodiment 1, the difference between this embodiment and Embodiment 1 is that: the sealing mechanism includes a sealing element 42, which is made of a metal plate and forms a concentric or substantially concentric corrugated shape. A first sealing layer 40 is provided on the right side of the sealing element 42, and a second sealing layer 41 is provided on the left side of the sealing element 42. The first sealing layer 40 and the second sealing layer 41 are respectively attached to the sealing element 42, and the first sealing layer 40 and the second sealing layer 41 are made of graphite.

[0050] When the first sealing plate 1, the second sealing plate 7, and the fixing frame 5 are fixed together by the screw 3 and the nut 4, the peaks and troughs on the sealing element 42 will fit with the first sealing plate 1, the second sealing plate 7, and the fixing frame 5, achieving a multi-layer sealing effect.

[0051] By setting a seal 42, a first sealing layer 40, and a second sealing layer 41, and by forming a concentric corrugated shape on a thin metal plate to achieve high contact pressure, and by adding a metal spring effect 35 to improve sealing performance, sufficient sealing function can be achieved under relatively low tightening pressure, even though it is made of metal. Moreover, the first sealing layer 40 and the second sealing layer 41 made of graphite are set on the outside of the seal 42 to further improve sealing performance. Therefore, even under low torque tightening conditions achieved by bolts or other tightening methods, the seal 42 exhibits excellent sealing performance. In addition, the amount of gasket compression can be set to be large during tightening, so the seal 42 has good adaptability to sealing surfaces.

[0052] Example 3:

[0053] like Figure 1-7 As shown, while other parts are the same as in Embodiment 1, the difference between this embodiment and Embodiment 1 is that: a groove 33 is provided on the inner wall of the inner cavity of the rotating column 11, a connecting pipe 37 is slidably connected to the inner cavity of the rotating column 11, and grooves 33 are also provided on the left and right sides of the connecting pipe 37. Two pressure plates 24 are slidably connected inside the connecting pipe 37, and the two pressure plates 24 are connected by multiple springs 35. A pressure rod 36 is fixedly connected to the opposite side of the two pressure plates 24. The pressure rod 36 extends to the outside of the connecting pipe 37 and is slidably connected to the connecting pipe 37. A slider 34 is fixedly connected to the opposite side of the two pressure rods 36. The slider 34 is slidably connected to the groove 33 on the rotating column 11.

[0054] When it is necessary to replace the incident spherical mirror 12, the screw 3 and nut 4 can be disassembled and the first sealing plate 1 can be removed.

[0055] Subsequently, by pressing the pressure rod 36, the pressure rod 36 causes the two pressure plates 24 to move closer together and compress the spring 35. As the two pressure plates 24 move closer together, they will cause the two sliders 34 to return to the inside of the connecting tube 37. When the sliders 34 return to the inside of the connecting tube 37, the limiting between the connecting tube 37 and the rotating column 11 will be removed. In this way, the connecting tube 37 and the incident spherical mirror 12 can be directly removed and replaced.

[0056] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A long-range optical absorption cell with low temperature drift and high stability, comprising a quartz glass cavity (6), characterized in that: The quartz glass cavity (6) is fixedly connected to the left and right ends of the fixed frame (5). The left and right sides of the quartz glass cavity (6) are provided with a first sealing plate (1) and a second sealing plate (7). The first sealing plate (1) and the second sealing plate (7) are respectively connected to the two fixed frames (5) by screws (3) and nuts (4). The fixed frame (5) is fixedly connected with a sealing mechanism. The quartz glass cavity (6) is provided with a multi-stage driving mechanism. The top of the multi-stage driving mechanism is provided with an incident spherical mirror (12). The multi-stage drive mechanism is used to adjust the placement angle of the incident spherical mirror (12), and the optical path is changed by changing the placement angle of the incident spherical mirror (12). The sealing mechanism is used to seal the connection between the fixed frame (5) and the first sealing plate (1) and the second sealing plate (7); The multi-stage drive mechanism includes a fixed plate (23), which is fixedly connected to the quartz glass cavity (6). A first gear (13) is rotatably connected to the fixed plate (23). A first rack (14) and a second rack (22) mesh on the first gear (13). Multiple sliding frames (16) are provided on both the front and rear sides of the first gear (13). The sliding frames (16) are fixedly connected to the fixed plate (23). Multiple sliding wheels (17) are rotatably connected to the bottom of the first rack (14) and the second rack (22). The sliding wheels (17) are located inside the sliding frames (16) and are slidably connected to the sliding frames (16). A power component is provided through the fixed plate (23). The power assembly includes a first rotating rod (20), which passes through a fixed plate (23) and extends to the bottom of a quartz glass cavity (6). The first rotating rod (20) is rotatably connected to the fixed plate (23) and the quartz glass cavity (6). The first rack (14) is connected to a toggle frame (19) via multiple fixed blocks (15). A rotating wheel (18) is slidably connected inside the toggle frame (19). A rotating plate (21) is rotatably connected to the rotating wheel (18). The rotating plate (21) is fixedly connected to the first rotating rod (20). A toggle assembly is fixedly connected to the fixed plate (23), and the toggle assembly is fixedly connected to the incident spherical mirror (12); the toggle assembly is used to control the up and down movement of the incident spherical mirror (12); The actuation assembly includes a rotating column (11), which is rotatably connected to a fixed plate (23). Two limiting blocks (44) are fixedly connected to the rotating column (11). A connecting tube (37) is slidably connected inside the rotating column (11). A rotating plate (10) is fixedly connected to the top of the connecting tube (37). An incident spherical mirror (12) is fixedly connected to the top of the rotating plate (10). An internal gear sleeve (30) is fixedly connected inside the rotating column (11). A second gear (29) meshes on the internal gear sleeve (30). A second rotating shaft (28) is provided through the second gear (29). The second rotating shaft (28) is fixedly connected to the second gear (29). The second rotating shaft (28) is rotatably connected to the fixed plate (23). A second bevel gear (26) is fixedly connected to the top of the second rotating shaft (28). A first bevel gear (25) meshes on the second bevel gear (26). A first rotating shaft (27) is fixedly connected to the first bevel gear (25). A turn wheel (32) is fixedly connected to the first rotating shaft (27). A support plate (31) is rotatably connected to the first rotating shaft (27). The support plate (31) is fixedly connected to the fixed plate (23).

2. The long-range optical absorption cell with low temperature drift and high stability according to claim 1, characterized in that: The first sealing plate (1) is equipped with an air inlet quick-connect interface (43), and the second sealing plate (7) is equipped with an air outlet quick-connect interface (8).

3. The long-range optical absorption cell with low temperature drift and high stability according to claim 1, characterized in that: The first sealing plate (1) is fixedly connected to a first optical window (2), and the second sealing plate (7) is provided with a fixed tube (9) through it. One end of the fixed tube (9) is fixedly connected to a second optical window (38), and the other end of the fixed tube (9) is fixedly connected to an exiting spherical mirror (39).

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