Heliott cell with function of adjusting mirror surface angle and optical path
By adjusting the mirror angle and optical path, the problem that traditional Heliot pool cannot adjust the lens angle is solved, achieving higher analytical sensitivity and experimental adaptability, and optimizing the spectral measurement effect.
Patent Information
- Application Number
- CN202421637451.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-07-11
AI Technical Summary
The concave lens angle and optical path of traditional Heliot pools cannot be adjusted freely, resulting in insufficient equipment flexibility and measurement accuracy, which cannot meet the experimental needs of different gases or concentrations.
A Heliot cell with the function of adjusting mirror angle and optical path is designed. Through the combination of X-axis, Y-axis, Z-axis adjustment knobs and adjustment springs, the angle deflection and distance adjustment of the concave lens are realized, and the number of reflections of the beam and the optical path length of the beam in the cell are accurately controlled.
It improves the interaction time and efficiency of light and sample, enhances the analysis sensitivity and accuracy, adapts to different experimental needs, reduces signal loss, and improves spectral resolution and sensitivity.
Smart Images
Figure CN223154839U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of Herriott cells, and particularly relates to a Herriott cell with the functions of adjusting the mirror angle and optical path. Background Art
[0002] A Herriott Cell, also known as a multi-pass optical cell, is a device used to increase the effective path length of light in a medium, thereby enhancing the interaction between light and the medium. This device is particularly useful in spectroscopic applications such as laser gas analysis and absorption spectroscopy because it can improve the measurement sensitivity. The traditional Herriott cell structure consists of windows, a base, two concave mirrors with metal coatings, concave mirror fixing devices, and gas channels, etc. Compared with other long-path absorption cells, the Herriott cell structure is more compact and stable, achieving multiple reflections in a smaller gas channel and providing a longer absorption path. For the current Herriott cell to meet the need for airtightness, its concave mirror lenses are mostly fixed at both ends of the gas channel, and the angle and optical path cannot be freely adjusted. Therefore, a single Herriott cell has only its fixed optical path, and different gases or different concentrations have different requirements for the optical path. To improve the flexibility of the device and the accuracy of measurement, and make the Herriott cell meet different types of experimental requirements and increase the versatility of the device, it is considered that designing a mechanical device capable of adjusting the angle of the concave mirror is a feasible and scientifically significant research work. Content of the Utility Model
[0003] The purpose of the utility model is to solve the above technical problems and provide a Herriott cell with the functions of adjusting the mirror angle and optical path.
[0004] A Herriott cell with the functions of adjusting the mirror angle and optical path, the Herriott cell is a hollow cylindrical structure, with a sealed chamber 12 inside. A gas inlet 15 and a gas outlet 16 are respectively arranged on the side wall of the Herriott cell and are sealed by seals; the Herriott cell includes two sets of symmetrically arranged end components, a laser incident hole 6, and a laser exit hole 14 arranged at both ends of the cylindrical structure;
[0005] Each set of end components consists of an X-axis adjustment knob 1, a Y-axis adjustment knob 2, a Z-axis adjustment knob 3, a cover body 5, a Z-axis adjustment spring 7, a Y-axis adjustment spring 8, a fixing device 9, and a concave mirror 11; the cover body 5 is arranged at the end of the Herriott cell, and the fixing device 9 and the concave mirror 11 are arranged inside the chamber 12;
[0006] The upper surface of the concave mirror 11 is fixedly connected to the lower surface of the fixing device 9. Two grooves are provided on the upper surface of the fixing device 9, and a universal shaft 13 is provided at the center of the upper surface of the fixing device 9. The universal shaft 13 is rotatably connected to the fixing device 9. Three threaded holes are provided on the cover body 5 of one set of end components. One threaded hole is provided at the center of the cover body 5, and the other two threaded holes are provided on both sides of this threaded hole. Threaded rods are provided at the tails of the X-axis adjustment knob 1, Y-axis adjustment knob 2, and Z-axis adjustment knob 3. The threaded rod of the X-axis adjustment knob 1 passes through the threaded hole at the center of the cover body 5 and is fixedly connected to the universal shaft 13. The threaded rods of the Y-axis adjustment knob 2 and Z-axis adjustment knob 3 respectively pass through the other two threaded holes and are respectively arranged in the two grooves of the fixing device 9.
[0007] Two grooves are provided on the lower surface of the cover body 5. The tops of the Z-axis adjustment spring 7 and Y-axis adjustment spring 8 are respectively arranged in the two grooves. The bottoms of the Z-axis adjustment spring 7 and Y-axis adjustment spring 8 are respectively fixedly connected to the upper surface of the fixing device 9. And the Z-axis adjustment spring 7, X-axis adjustment knob 1, and Z-axis adjustment knob 3 are in the same vertical plane, and the Y-axis adjustment spring 8, X-axis adjustment knob 1, and Y-axis adjustment knob 2 are in the same vertical plane.
[0008] A laser incident hole 6 is further provided on the surface of the cover body 5. The laser channel 10 axially penetrates the fixing device 9 and the concave mirror 11, and the laser incident hole 6 and the laser channel 10 are concentrically arranged. A laser emission hole 14 is further provided on the surface of the cover body 5 of the other set of end components. The laser channel 10 axially penetrates the fixing device 9 and the concave mirror 11, and the laser incident hole 6 and the laser channel 10 are concentrically arranged.
[0009] Advantages of the present utility model:
[0010] (1) Through the cooperation of the X-axis adjustment knob, Y-axis adjustment knob, Z-axis adjustment knob, Y-axis adjustment spring, and Z-axis adjustment spring of the present utility model, the deflection of the angle of the concave mirror lens is realized. By precisely adjusting the angle of the lens, the number of reflections of the light beam in the Herriott cell can be better controlled, which directly affects the interaction time and efficiency of light and the sample. The increased optical path allows more light to interact with the sample, thereby increasing the accumulation of signals and improving the sensitivity and accuracy of analysis. When different gases or different gas concentrations are introduced into the gas cell, by adjusting the angle of the lens and the distance between them, the maximum signal reception of different optical path lengths can be achieved.
[0011] If only the incident angle of the concave mirror is changed, the optical path will gradually shift during the reflection process of the lens; secondly, there will be a certain attenuation every time light is reflected on the mirror surface. However, the present utility model can change the angles and distances of two concave mirrors simultaneously, so that not only can the distance between the mirrors be adjusted to change the optical path, but also the number of reflections will not be changed, avoiding excessive attenuation.
[0012] (2) The present utility model can adjust the angle of the concave mirror, enabling the optical system to better adapt to different types of experimental requirements. For example, during gas analysis, different gases and concentrations may require different optical path lengths to maximize the signal reception. By adjusting the angle of the concave mirror, the propagation path of light in the cell can be precisely controlled, thereby optimizing the experimental setup.
[0013] (3) The adjustable mirror angle of the present utility model allows the same Herriott cell to be used in a variety of different experiments, without having to redesign or purchase new equipment for each application. This design flexibility enables the equipment to adapt to changing research needs and different experimental conditions.
[0014] (4) Adjusting the angle of the concave mirror of the present utility model can help better focus or disperse the light beams entering and leaving the cell, which is crucial for improving the resolution and sensitivity of the spectrum. The correct optical path setup can reduce signal loss and improve the ability of the detector to capture scattered or absorbed light.
[0015] The present utility model can obtain a Herriott cell with the functions of adjusting the mirror angle and optical path. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It shows a schematic structural diagram of a Herriott cell of the present utility model with the functions of adjusting the mirror angle and optical path. 1 represents the X-axis adjustment knob, 2 represents the Y-axis adjustment knob, 3 represents the Z-axis adjustment knob, 6 represents the laser incident hole, 7 represents the Z-axis adjustment spring, 8 represents the Y-axis adjustment spring, 12 represents the chamber, 15 represents the gas inlet, and 16 represents the gas outlet;
[0017] Figure 2 It shows a schematic structural diagram of a Herriott cell of the present utility model with the functions of adjusting the mirror angle and optical path. 1 represents the X-axis adjustment knob, 2 represents the Y-axis adjustment knob, 3 represents the Z-axis adjustment knob, 7 represents the Z-axis adjustment spring, 8 represents the Y-axis adjustment spring, 10 represents the laser channel, 14 represents the laser emission hole, 15 represents the gas inlet, and 16 represents the gas outlet;
[0018] Figure 3 Represents Figure 1Schematic diagram of the internal structure of the left end component. 1 represents the X-axis adjustment knob, 2 represents the Y-axis adjustment knob, 3 represents the Z-axis adjustment knob, 4 represents the screw, 5 represents the cover, 6 represents the laser incident hole, 7 represents the Z-axis adjustment spring, 8 represents the Y-axis adjustment spring, 9 represents the fixing device, 10 represents the laser channel, 11 represents the concave mirror, 12 represents the chamber, 13 represents the universal joint;
[0019] Figure 4 represents Figure 3 Front view of, 1 represents the X-axis adjustment knob, 2 represents the Y-axis adjustment knob, 3 represents the Z-axis adjustment knob, 4 represents the screw, 5 represents the cover, 7 represents the Z-axis adjustment spring, 8 represents the Y-axis adjustment spring, 9 represents the fixing device, 10 represents the laser channel, 11 represents the concave mirror, 12 represents the chamber, 13 represents the universal joint;
[0020] Figure 5 represents Figure 3 Top view of, 1 represents the X-axis adjustment knob, 2 represents the Y-axis adjustment knob, 3 represents the Z-axis adjustment knob, 7 represents the Z-axis adjustment spring, 8 represents the Y-axis adjustment spring. Detailed implementation method
[0021] Detailed implementation method one: In this implementation method, a Herriott cell with the functions of adjusting the mirror angle and optical path is provided. The Herriott cell is a hollow cylindrical structure with a sealed chamber 12 inside. A gas inlet 15 and a gas outlet 16 are respectively arranged on the side wall of the Herriott cell and are sealed by seals; the Herriott cell includes two sets of symmetrically arranged end components, a laser incident hole 6 and a laser exit hole 14 arranged at both ends of the cylindrical structure;
[0022] Each set of end components is composed of an X-axis adjustment knob 1, a Y-axis adjustment knob 2, a Z-axis adjustment knob 3, a cover 5, a Z-axis adjustment spring 7, a Y-axis adjustment spring 8, a fixing device 9 and a concave mirror 11; the cover 5 is arranged at the end of the Herriott cell, and the fixing device 9 and the concave mirror 11 are arranged inside the chamber 12;
[0023] The upper surface of the concave mirror 11 is fixedly connected to the lower surface of the fixing device 9. Two grooves are provided on the upper surface of the fixing device 9, and a universal shaft 13 is provided at the center of the upper surface of the fixing device 9. The universal shaft 13 is rotatably connected to the fixing device 9. Three threaded holes are provided on the cover body 5 of one set of end components. One threaded hole is provided at the center of the cover body 5, and the other two threaded holes are provided on both sides of this threaded hole. Threaded rods are provided at the tails of the X-axis adjustment knob 1, the Y-axis adjustment knob 2, and the Z-axis adjustment knob 3. The threaded rod of the X-axis adjustment knob 1 passes through the threaded hole at the center of the cover body 5 and is fixedly connected to the universal shaft 13. The threaded rods of the Y-axis adjustment knob 2 and the Z-axis adjustment knob 3 respectively pass through the other two threaded holes and are respectively arranged in the two grooves of the fixing device 9.
[0024] Two grooves are provided on the lower surface of the cover body 5. The tops of the Z-axis adjustment spring 7 and the Y-axis adjustment spring 8 are respectively arranged in the two grooves. The bottoms of the Z-axis adjustment spring 7 and the Y-axis adjustment spring 8 are respectively fixedly connected to the upper surface of the fixing device 9. And the Z-axis adjustment spring 7, the X-axis adjustment knob 1, and the Z-axis adjustment knob 3 are in the same vertical plane. The Y-axis adjustment spring 8, the X-axis adjustment knob 1, and the Y-axis adjustment knob 2 are in the same vertical plane.
[0025] A laser incident hole 6 is further provided on the surface of the cover body 5. The laser channel 10 axially penetrates the fixing device 9 and the concave mirror 11, and the laser incident hole 6 and the laser channel 10 are concentrically arranged. A laser emission hole 14 is further provided on the surface of the cover body 5 of the other set of end components. The laser channel 10 axially penetrates the fixing device 9 and the concave mirror 11, and the laser incident hole 6 and the laser channel 10 are concentrically arranged.
[0026] A certain gap is maintained between the concave mirror 11 and the end of the chamber 12 for angle adjustment.
[0027] Specific Embodiment 2: The difference between this embodiment and Specific Embodiment 1 is that the cover body 5 at the end of the Herriott cell is connected to the end of the Herriott cell by screws 4.
[0028] Other compositions and connection methods are the same as those in Specific Embodiment 1.
[0029] Specific Embodiment 3: The difference between this embodiment and Specific Embodiment 1 or 2 is that 4 threaded holes are evenly distributed on the cover body 5 and the upper edge of the end of the Herriott cell, and screws 4 are arranged in the threaded holes.
[0030] Other compositions and connection methods are the same as those in Specific Embodiment 1 or 2.
[0031] Embodiment 4: The difference between this embodiment and any one of Embodiments 1 to 3 is that the horizontal distance between the Z-axis adjustment spring 7 and the X-axis adjustment knob 1 is equal to the horizontal distance between the Z-axis adjustment knob 3 and the X-axis adjustment knob 1.
[0032] The other components and connection methods are the same as those in Embodiments 1 to 3.
[0033] Embodiment 5: The difference between this embodiment and any one of Embodiments 1 to 4 is that the horizontal distance between the Y-axis adjustment spring 8 and the X-axis adjustment knob 1 is equal to the horizontal distance between the Y-axis adjustment knob 2 and the X-axis adjustment knob 1.
[0034] The other components and connection methods are the same as those in Embodiments 1 to 4.
[0035] Embodiment 6: The difference between this embodiment and any one of Embodiments 1 to 5 is that the angles formed by the Y-axis adjustment knob 2, the X-axis adjustment knob 1, and the Z-axis adjustment knob 3, and the angles formed by the Z-axis adjustment spring 7, the X-axis adjustment knob 1, and the Y-axis adjustment spring 8 are both 90°.
[0036] The other components and connection methods are the same as those in Embodiments 1 to 5.
[0037] The following embodiments are used to verify the beneficial effects of the present utility model:
[0038] Embodiment 1: A Herriott cell with the functions of adjusting the mirror angle and optical path. The Herriott cell is a hollow cylindrical structure with a sealed chamber 12 inside. A gas inlet 15 and a gas outlet 16 are respectively arranged on the side wall of the Herriott cell and are sealed by seals. The gas in the chamber 12 is carbon dioxide, nitrogen, methane, ethane, propane, n-butane or isobutane. The Herriott cell includes two sets of symmetrically arranged end components, a laser incident hole 6, and a laser exit hole 14 arranged at both ends of the cylindrical structure.
[0039] Each set of end components is composed of an X-axis adjustment knob 1, a Y-axis adjustment knob 2, a Z-axis adjustment knob 3, a cover 5, a Z-axis adjustment spring 7, a Y-axis adjustment spring 8, a fixing device 9, and a concave mirror 11. The cover 5 is arranged at the end of the Herriott cell. Four threaded holes are evenly distributed on the upper edge of the cover 5 and the end of the Herriott cell. Screws 4 are arranged in the threaded holes, and the cover 5 is connected to the end of the Herriott cell through the screws 4.
[0040] The described fixing device 9 and the concave mirror 11 are arranged inside the chamber 12. The upper surface of the concave mirror 11 is fixedly connected to the lower surface of the fixing device 9. The upper surface of the fixing device 9 is provided with two grooves, and a universal shaft 13 is arranged at the center of the upper surface of the fixing device 9. The universal shaft 13 is rotationally connected to the fixing device 9. Three threaded holes are provided on the cover body 5 of one set of end components. One threaded hole is arranged at the center of the cover body 5, and the other two threaded holes are arranged on both sides of this threaded hole. Threaded rods are provided at the tails of the X-axis adjustment knob 1, the Y-axis adjustment knob 2, and the Z-axis adjustment knob 3. The threaded rod of the X-axis adjustment knob 1 passes through the threaded hole at the center of the cover body 5 and is fixedly connected to the universal shaft 13. The threaded rods of the Y-axis adjustment knob 2 and the Z-axis adjustment knob 3 respectively pass through the other two threaded holes and are respectively arranged in the two grooves of the fixing device 9.
[0041] Two grooves are provided on the lower surface of the cover body 5. The tops of the Z-axis adjustment spring 7 and the Y-axis adjustment spring 8 are respectively arranged in the two grooves. The bottoms of the Z-axis adjustment spring 7 and the Y-axis adjustment spring 8 are respectively fixedly connected to the upper surface of the fixing device 9. And the Z-axis adjustment spring 7, the X-axis adjustment knob 1, and the Z-axis adjustment knob 3 are in the same vertical plane. The Y-axis adjustment spring 8, the X-axis adjustment knob 1, and the Y-axis adjustment knob 2 are in the same vertical plane.
[0042] The horizontal distance between the Z-axis adjustment spring 7 and the X-axis adjustment knob 1 is equal to the horizontal distance between the Z-axis adjustment knob 3 and the X-axis adjustment knob 1. The horizontal distance between the Y-axis adjustment spring 8 and the X-axis adjustment knob 1 is equal to the horizontal distance between the Y-axis adjustment knob 2 and the X-axis adjustment knob 1.
[0043] The included angles formed by the Y-axis adjustment knob 2, the X-axis adjustment knob 1, and the Z-axis adjustment knob 3, and the included angles formed by the Z-axis adjustment spring 7, the X-axis adjustment knob 1, and the Y-axis adjustment spring 8 are both 90°.
[0044] A laser incident hole 6 is also provided on the surface of the cover body 5. The laser channel 10 axially penetrates the fixing device 9 and the concave mirror 11, and the laser incident hole 6 and the laser channel 10 are concentrically arranged. A laser emission hole 14 is also provided on the surface of the cover body 5 of the other set of end components. The laser channel 10 axially penetrates the fixing device 9 and the concave mirror 11, and the laser incident hole 6 and the laser channel 10 are concentrically arranged.
[0045] The principle of adjusting the angle of the concave mirror in this embodiment:
[0046] The laser enters the laser channel through the laser incident hole, reflects back and forth between the two concave mirrors. During each reflection process, the laser passes through the sample medium and finally exits through the laser emission hole. In this embodiment, according to the different optical paths and angles required by the gas, the adjustment knob is rotated forward or backward to deflect the concave mirror.
[0047] like Figure 3 As shown, when the distance between the two concave mirrors needs to be adjusted, just rotate the X-axis adjustment knob. If the X-axis adjustment knob is rotated clockwise, the distance between the two concave mirrors will decrease, and vice versa. When the Y-axis adjustment knob is rotated clockwise, the Y-axis adjustment knob pushes one side of the fixture forward. Since the X-axis adjustment knob is set at the center of the fixture and acts as a fulcrum, the other side of the fixture compresses the Y-axis adjustment spring, and the concave mirror achieves an angle deflection; if the Y-axis adjustment knob is rotated counterclockwise, the situation is exactly the opposite.
[0048] When the Z-axis adjustment knob is rotated clockwise, the Z-axis adjustment knob pushes one side of the fixture forward, and the other side of the fixture compresses the Z-axis adjustment spring, so that the concave mirror achieves angular deflection; if the Z-axis adjustment knob is rotated counterclockwise, the situation is just the opposite.
[0049] The signal collected in the Heliot cell is collected by a camera lens, which is placed outside the cell, close to the outer surface. The signal is collimated by the lens and enters the spectrometer, and a filter is used to cut the Rayleigh scattered light. The spectrometer transmits the signal to a cooled CCD camera for measurement with an exposure time of 30 seconds. Finally, the collected Raman spectral data are processed using a hybrid algorithm based on background correction and least squares error minimization to extract gas concentrations.
Claims
1. A Herriott cell with the functions of adjusting the mirror angle and optical path, characterized in that The described Herriott cell is a hollow cylindrical structure with a sealed chamber (12) inside. A gas inlet (15) and a gas outlet (16) are respectively arranged on the side wall of the Herriott cell and are sealed by seals; the Herriott cell includes two sets of symmetrically arranged end assemblies, a laser incident hole (6) and a laser exit hole (14) arranged at both ends of the cylindrical structure; Each set of end assemblies consists of an X-axis adjustment knob (1), a Y-axis adjustment knob (2), a Z-axis adjustment knob (3), a cover body (5), a Z-axis adjustment spring (7), a Y-axis adjustment spring (8), a fixing device (9) and a concave mirror (11); the cover body (5) is arranged at the end of the Herriott cell, and the fixing device (9) and the concave mirror (11) are arranged inside the chamber (12); The upper surface of the concave mirror (11) is fixedly connected to the lower surface of the fixing device (9). Two grooves are arranged on the upper surface of the fixing device (9), and a universal shaft (13) is arranged at the center of the upper surface of the fixing device (9). The universal shaft (13) is rotatably connected to the fixing device (9); three threaded holes are arranged on the cover body (5) of one set of end assemblies. One threaded hole is arranged at the center of the cover body (5), and the other two threaded holes are arranged on both sides of this threaded hole; threaded rods are arranged at the tails of the X-axis adjustment knob (1), the Y-axis adjustment knob (2) and the Z-axis adjustment knob (3). The threaded rod of the X-axis adjustment knob (1) passes through the threaded hole at the center of the cover body (5) and is fixedly connected to the universal shaft (13). The threaded rods of the Y-axis adjustment knob (2) and the Z-axis adjustment knob (3) respectively pass through the other two threaded holes and are respectively arranged in the two grooves of the fixing device (9); Two grooves are arranged on the lower surface of the cover body (5). The tops of the Z-axis adjustment spring (7) and the Y-axis adjustment spring (8) are respectively arranged in the two grooves. The bottoms of the Z-axis adjustment spring (7) and the Y-axis adjustment spring (8) are respectively fixedly connected to the upper surface of the fixing device (9); and the Z-axis adjustment spring (7), the X-axis adjustment knob (1) and the Z-axis adjustment knob (3) are in the same vertical plane, and the Y-axis adjustment spring (8), the X-axis adjustment knob (1) and the Y-axis adjustment knob (2) are in the same vertical plane; A laser incident hole (6) is also arranged on the surface of the cover body (5). The laser channel (10) axially penetrates through the fixing device (9) and the concave mirror (11), and the laser incident hole (6) and the laser channel (10) are concentrically arranged; a laser exit hole (14) is also arranged on the surface of the cover body (5) of the other set of end assemblies. The laser channel (10) axially penetrates through the fixing device (9) and the concave mirror (11), and the laser incident hole (6) and the laser channel (10) are concentrically arranged.
2. The Herriott cell with the functions of adjusting the mirror angle and optical path according to claim 1, characterized in that The cover body (5) at the end of the Herriott cell is connected to the end of the Herriott cell by screws (4).
3. A Herriott cell having the function of adjusting the mirror angle and optical path according to claim 2, characterized in that Four threaded holes are evenly distributed on the cover body (5) and the upper edge of the end of the Herriott cell, and screws (4) are arranged in the threaded holes.
4. A Herriott cell having the functions of adjusting the mirror angle and the optical path according to claim 1, characterized in that The horizontal distance between the Z-axis adjusting spring (7) and the X-axis adjusting knob (1) is equal to the horizontal distance between the Z-axis adjusting knob (3) and the X-axis adjusting knob (1).
5. A Herriott cell having the functions of adjusting the mirror angle and optical path according to claim 1, characterized in that The horizontal distance between the Y-axis adjusting spring (8) and the X-axis adjusting knob (1) is equal to the horizontal distance between the Y-axis adjusting knob (2) and the X-axis adjusting knob (1).
6. A Herriott cell having the function of adjusting the mirror angle and optical path according to claim 1, 4 or 5, characterized in that The angles formed by the Y-axis adjusting knob (2), the X-axis adjusting knob (1) and the Z-axis adjusting knob (3), and the angles formed by the Z-axis adjusting spring (7), the X-axis adjusting knob (1) and the Y-axis adjusting spring (8) are both 90°.