Lens switching mechanism of picosecond transient absorption spectrum system

Abstract

The invention discloses a lens switching mechanism of a picosecond transient absorption spectrum system, and belongs to the technical field of spectrometers. The mechanism comprises a driving assembly, a reflector assembly, a supporting assembly and a limiting assembly, the driving assembly comprises a driving motor, a sliding rail and a sliding block, the sliding block is installed on the sliding rail, a protruding part is arranged on the sliding block, and the driving motor drives the sliding block to longitudinally move along the sliding rail; the reflecting mirror assembly comprises a rotating arm and a reflecting mirror, the reflecting mirror is arranged at the first end of the rotating arm, and the protruding part is located over the second end of the rotating arm; the supporting assembly comprises a support and a rotating shaft, the rotating arm is connected with the supporting frame through the rotating shaft, and the two ends of the rotating arm rotate in the vertical plane with the rotating shaft on the supporting frame as the center. The limiting assembly comprises a limiting support and a limiting ball head and is fixed below the first end of the rotating arm, a limiting hole matched with the limiting ball head is formed in the limiting support, and the limiting ball head is fixed to the first end of the rotating arm. According to the mechanism, automatic switching of internal light paths is realized, and the measurement precision of the system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of spectrometers, and in particular to a lens switching mechanism for a picosecond transient absorption spectroscopy system. Background Art

[0002] In the picosecond transient absorption spectroscopy system, internal optical path switching refers to changing the direction of the optical path by changing the angle or position of the reflector located at the intersection of the two optical paths. The accuracy and convenience of internal optical path switching play a key role in the system performance and experimental operation efficiency of the picosecond transient absorption spectroscopy system.

[0003] In the prior art, internal optical path switching is usually achieved by manually switching the reflector. However, manual switching of the reflector requires opening the instrument housing, and the operation process is complicated, time-consuming and labor-intensive. In addition, it is difficult to ensure that the reflector can be accurately positioned after switching each time the reflector is manually switched. Positioning deviation may have a negative impact on the accuracy and stability of the optical path, thereby resulting in poor measurement accuracy of the picosecond transient absorption spectroscopy system. Summary of the invention

[0004] The embodiment of the present application provides a lens switching mechanism for a picosecond transient absorption spectroscopy system, which can solve the problems of complex operation process and poor measurement accuracy in related technologies. The technical solution is as follows: According to a first aspect of the present application, a lens switching mechanism for a picosecond transient absorption spectroscopy system is provided, the mechanism comprising: a driving component, a reflector component, a supporting component and a limiting component; The driving assembly includes a driving motor, a slide rail and a slider, the slider is mounted on the slide rail, and a protrusion is provided on the slider, and the driving motor drives the slider to move longitudinally along the slide rail; The reflector assembly comprises a rotating arm and a reflector, wherein the rotating arm has a first end and a second end opposite to each other, the reflector is arranged at the first end of the rotating arm, and the protrusion is located directly above the second end of the rotating arm; The support assembly includes a support frame and a rotating shaft, the rotating arm is connected to the support frame through the rotating shaft, and both ends of the rotating arm rotate in a vertical plane with the rotating shaft on the support frame as the center; The limit assembly includes a limit bracket and a limit ball head, the limit bracket is fixed below the first end of the rotating arm, the limit bracket is provided with a limit hole matching the limit ball head, the limit ball head is fixed to the first end of the rotating arm, and when the limit ball head is located in the limit hole, the reflector is located in the main light path.

[0005] Optionally, the lens switching mechanism of the picosecond transient absorption spectroscopy system further includes an elastic component, the elastic component includes a tension spring, one end of the tension spring is connected to the first end of the rotating arm, and the other end of the tension spring is connected to the support frame.

[0006] Optionally, the picosecond transient absorption spectroscopy system lens switching mechanism further comprises a bottom plate, and the driving component, the supporting component and the limiting component are arranged on the bottom plate; The bottom plate is provided with a first groove and a second groove, and one end of the support frame and the limiting bracket are respectively located in the first groove and the second groove and are bolted to the first groove and the second groove.

[0007] Optionally, a third groove is provided at one end of the support frame away from the bottom plate, a first through hole and a second through hole are provided on the side wall of the third groove opposite to each other, a third through hole is provided at a portion of the rotating arm located in the third groove, and the rotating shaft passes through the first through hole, the third through hole and the second through hole; The reflector assembly further comprises two bearings, the outer rings of the two bearings are interference fit with the third through hole of the rotating arm, and the inner rings of the bearings are sleeved on the rotating shaft. Optionally, the reflector assembly further includes two gaskets, and the two gaskets are respectively arranged between the two bearings and the inner wall of the third groove.

[0008] Optionally, the limiting ball head is a limiting ball head screw, which includes a ball head, a screw rod and a locking nut, one end of the screw rod is threadedly connected to the first end of the rotating arm, the other end of the screw rod is connected to the ball head, and the locking nut is configured to fix the screw rod.

[0009] Optionally, the drive assembly also includes a slide rail bracket and a lead screw, the slide rail bracket is bolted to the base plate, a mounting groove is formed inside the slide rail, the lead screw is arranged along an extension direction of the mounting groove and fixed to the slide rail, the slider is a hollow structure, the slider is sleeved on the lead screw and the slide rail, the inner hole of the slider cooperates with the nut on the lead screw, the outer surface of the slider contacts the groove wall of the slide rail, the slide rail is bolted to the slide rail bracket, and the drive motor is located at one end of the slide rail close to the base plate.

[0010] Optionally, the driving assembly further comprises a photoelectric switch and a photoelectric switch sensing sheet, wherein the photoelectric switch is arranged on the slide rail bracket, the photoelectric switch sensing sheet is bolted to the slider, and the photoelectric switch is configured to stop the driving motor from running when triggered by the photoelectric switch sensing sheet; Wherein, when the slide block moves along the length direction of the slide rail until the protrusion drives the rotating arm to move the reflector out of the main light path, the photoelectric switch sensor sheet triggers the photoelectric switch.

[0011] Optionally, the raised portion of the sliding block is a roller.

[0012] Optionally, the elastic component also includes a first fixing ring and a second fixing ring, the first fixing ring is bolted to the first end of the rotating arm, the second fixing ring is bolted to the end of the support frame close to the base plate, through holes are provided on the first fixing ring and the second fixing ring, and the two ends of the tension spring are respectively hooked in the through holes of the first fixing ring and the second fixing ring.

[0013] The beneficial effects of the technical solution provided by the embodiments of the present application include at least: The lens switching mechanism of the picosecond transient absorption spectroscopy system provided in the embodiment of the present application, when switching the internal optical path, the driving motor drives the slider to move longitudinally downward along the slide rail, the protrusion provided on the slider abuts against the top of the rotating arm, and in the process of the movement of the slider, the second end of the rotating arm is driven to move downward in the vertical plane, the rotating shaft drives the rotating arm to rotate, and the reflector located at the first end of the rotating arm moves upward in the vertical plane until the reflector moves out of the main optical path. When the reflector switches back to the main optical path, the driving motor drives the slider to move longitudinally upward along the slide rail, the second end of the rotating arm moves upward in the vertical plane, the rotating shaft drives the rotating arm to rotate, and the reflector located at the first end of the rotating arm moves downward in the vertical plane until the limiting ball head is seated in the limiting hole on the limiting bracket. It can be seen that the lens switching mechanism of the picosecond transient absorption spectroscopy system provided in the embodiment of the present application can realize the automatic switching of the internal optical path through the cooperation of the driving component, the reflector component, the support component and the limiting component, and realizes the effect of simple and fast switching of the reflector. When the reflector is moved back to the main optical path, the limiting ball head at one end of the reflector is seated in the limiting hole, which can accurately locate the position of the reflector, thereby improving the measurement accuracy of the picosecond transient absorption spectroscopy system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 A schematic diagram of the structure of a lens switching mechanism for a picosecond transient absorption spectroscopy system provided in an embodiment of the present application; Figure 2 for Figure 1A schematic structural diagram of the lens switching mechanism of the picosecond transient absorption spectroscopy system from another angle is shown; Figure 3 A schematic diagram of a structure in which a reflector of a lens switching mechanism of a picosecond transient absorption spectroscopy system provided in an embodiment of the present application is moved out of a main light path; Figure 4 for Figure 3 A schematic structural diagram of the lens switching mechanism of the picosecond transient absorption spectroscopy system from another angle is shown; Figure 5 A schematic structural diagram of another angle of the lens switching mechanism of the picosecond transient absorption spectroscopy system provided in an embodiment of the present application; Figure 6 for Figure 5 A cross-sectional schematic diagram of a lens switching mechanism of a picosecond transient absorption spectroscopy system is shown; Figure 7 for Figure 6 A schematic diagram of the partial structure of the lens switching mechanism of the picosecond transient absorption spectroscopy system is shown.

[0016] Description of reference numerals: 1-bottom plate, 11-first groove, 12-second groove; 2-driving assembly, 21-driving motor, 22-slide rail, 23-sliding block, 231-protruding portion, 2311-roller, 24-slide rail bracket, 25-lead screw, 26-photoelectric switch, 27-photoelectric switch sensor sheet; 3-reflector assembly, 31-rotating arm, 311-first end of the rotating arm, 312-second end of the rotating arm, 313-third through hole, 32-reflector, 33-bearing, 331-locking nut, 34-light baffle, 35-gasket; 4-support assembly, 41-support frame, 411-third groove, 4111-first through hole, 4112-second through hole, 42-rotating shaft; 5-limiting assembly, 51-limiting bracket, 52-limiting ball head, 53-limiting hole, 531-limiting ball head screw, 5311-ball head, 5312-screw, 5313-locking nut; 6-elastic component, 61-tension spring, 62-first fixing ring, 63-second fixing ring.

[0017] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] It should be noted that in the present application, the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element of the present application must have a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0020] In the present application, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0021] Figure 1 is a structural schematic diagram of a lens switching mechanism of a picosecond transient absorption spectroscopy system shown in an embodiment of the present application, Figure 2 for Figure 1 The schematic diagram of the structure of the lens switching mechanism of the picosecond transient absorption spectroscopy system from another angle is shown, combined with Figure 1 and Figure 2 As shown, the lens switching mechanism of the picosecond transient absorption spectroscopy system may include a driving component 2, a reflector component 3, a supporting component 4 and a limiting component 5.

[0022] The driving assembly 2 includes a driving motor 21 , a slide rail 22 and a slider 23 . The slider 23 is mounted on the slide rail 22 . A protrusion 231 is provided on the slider 23 . The slider 23 is configured to move longitudinally along the slide rail 22 under the drive of the driving motor 21 .

[0023] The reflector assembly 3 includes a rotating arm 31 and a reflector 32 . The rotating arm 31 has a first end 311 and a second end 312 opposite to each other. The reflector 32 is disposed at the first end 311 of the rotating arm, and the protrusion 231 is located directly above the second end 312 of the rotating arm.

[0024] The support assembly 4 includes a support frame 41 and a rotating shaft 42 . The rotating arm 31 is connected to the support frame 41 via the rotating shaft 42 . Both ends of the rotating arm 31 rotate in a vertical plane with the rotating shaft 42 on the support frame 41 as the center.

[0025] The limiting assembly 5 includes a limiting bracket 51 and a limiting ball head 52. The limiting bracket 51 is fixed below the first end 311 of the rotating arm. The limiting bracket 51 is provided with a limiting hole 53 matching the limiting ball head 52. The limiting ball head 52 is fixed to the lower side or side wall of the first end 311 of the rotating arm. When the limiting ball head 52 is located in the limiting hole 53, the reflector 32 is located in the main light path.

[0026] Figure 3 This is a schematic diagram of the structure in which the reflector of the lens switching mechanism of the picosecond transient absorption spectroscopy system provided in an embodiment of the present application is moved out of the main light path. Figure 4 for Figure 3 Another structural diagram from another angle, such as Figure 3 , 4 As shown, when the internal optical path is switched, the driving motor 21 drives the slider 23 to move longitudinally downward along the slide rail 22, and the protrusion 231 set on the slider 23 abuts against the second end 312 of the rotating arm, and in the process of the movement of the slider 23, the second end 312 of the rotating arm is driven to move downward in the vertical plane, and the rotating shaft 42 drives the rotating arm 31 to rotate, and the reflector 32 located at the first end 311 of the rotating arm moves upward in the vertical plane until the reflector 32 moves out of the main optical path.

[0027] like Figure 1 and 2 As shown, it is a schematic diagram of the structure of a mirror of a picosecond transient absorption spectroscopy system lens switching mechanism located in the main light path. Figure 3 , 4 The state not in the main optical path is switched to Figure 1 and 2 When the reflector is in the state of being in the main light path, the specific switching process is as follows: at this time, the slider 23 is located below the slide rail 22, and the driving motor 21 drives the slider 23 to move upward along the slide rail 22 longitudinally, and the protrusion 231 moves upward accordingly, and the pressure of the protrusion 231 abutting against the second end 312 of the rotating arm disappears, and the second end 312 of the rotating arm moves upward in the vertical plane. The rotating shaft 42 drives the rotating arm 31 to rotate, and the reflector 32 located at the first end 311 of the rotating arm moves downward in the vertical plane until the limiting ball head 52 is seated in the limiting hole 53 on the limiting bracket 51, and the reflector 32 switches back to the main light path.

[0028] In summary, the lens switching mechanism of the picosecond transient absorption spectroscopy system provided in the embodiment of the present application can realize the automatic switching of the internal optical path through the cooperation of the driving component, the reflector component, the support component and the limit component after receiving the light source change signal, making the switch of the reflector more convenient. When the reflector moves back to the main optical path, the limit ball head at one end of the reflector is seated in the limit hole, and the position of the reflector can be accurately positioned, thereby improving the measurement accuracy of the picosecond transient absorption spectroscopy system.

[0029] Alternatively, if Figure 2As shown, the lens switching mechanism of the picosecond transient absorption spectroscopy system also includes a base plate 1, a driving assembly 2, a supporting assembly 4 and a limiting assembly 5 are arranged on the base plate 1, and two first grooves 11 and a second groove 12 are arranged on the base plate 1. One end of the supporting frame 41 is located in the first groove 11 and is bolted to the first groove 11, and one end of the limiting bracket 51 is located in the second groove 12 and is bolted to the second groove 12. The supporting frame 41 and the limiting bracket 51 can also be connected to the base plate 1 by means of a snap connection, a slide groove connection, etc., which is not limited in the embodiment of the present application.

[0030] Figure 5 A schematic structural diagram of another angle of the lens switching mechanism of the picosecond transient absorption spectroscopy system provided in the embodiment of the present application, the lens switching mechanism of the picosecond transient absorption spectroscopy system also includes an elastic component 6, the elastic component 6 includes a tension spring 61, a first fixing ring 62 and a second fixing ring 63, the first fixing ring 62 is bolted to the first end 311 of the rotating arm, the second fixing ring 63 is bolted to the end of the support frame 41 close to the bottom plate 1, the first fixing ring 62 and the second fixing ring 63 are provided with through holes, and the two ends of the tension spring 61 are respectively hooked in the through holes of the first fixing ring 62 and the second fixing ring 63. In addition, the second fixing ring 63 can also be provided at one end of the limit bracket 51 close to the bottom plate 1, and is bolted to the limit bracket 51, which is not limited in the embodiment of the present application.

[0031] When the reflector 32 switches back to the main light path, the slider moves up and the second end of the rotating arm moves up accordingly. At this time, the first end 311 of the rotating arm moves in a direction close to the base plate 1, and the tension spring 61 applies a pulling force to the first end 311 of the rotating arm through the first fixing ring 62. The pulling force is converted into a rotational torque around the rotating shaft 42, driving the first end 311 of the rotating arm to move stably in a direction close to the base plate 1, and the tension of the tension spring 61 can make the limiting ball head 52 stably sit in the limiting hole, avoiding a hard collision between the limiting ball head and the limiting hole when it is seated, thereby generating a positioning deviation caused by vibration. Therefore, the elastic component provided in the embodiment of the present application can reduce the vibration during the switching process of the reflector. Through the cooperation of the elastic component and the limiting component, the position of the reflector can be further accurately positioned, thereby improving the measurement accuracy of the picosecond transient absorption spectroscopy system.

[0032] Figure 6 for Figure 5 A cross-sectional schematic diagram of the lens switching mechanism of the picosecond transient absorption spectroscopy system is shown. Figure 7 for Figure 6 The schematic diagram of the local structure of the lens switching mechanism of the picosecond transient absorption spectroscopy system is shown in FIG. Figure 6 and Figure 7As shown, a third groove 411 is provided at one end of the support frame 41 away from the base plate, and a first through hole 4111 and a second through hole 4112 are relatively provided on the side walls of the third groove 411, and a third through hole 313 is provided at the portion of the rotating arm 31 located in the third groove 411, and the rotating shaft 42 passes through the first through hole 4111, the third through hole 313 and the second through hole 4112. The reflector assembly also includes two bearings 33 and two gaskets 35, and the two bearings have a gap on one side away from the inner wall of the third groove (not shown in the figure), that is, there is a certain gap between the opposite outer ring end surfaces of the two bearings 33, and the gap facilitates the third through hole 313 to generate pressure and friction through elastic deformation, thereby achieving a tight connection. The outer rings of the two bearings 33 are interference fit with the third through hole 313 of the swing arm, the inner rings of the two bearings 33 are sleeved on the rotating shaft 42, and the two gaskets 35 are respectively arranged between the inner rings of the two bearings 33 and the inner walls of the third groove 411, wherein the interference fit refers to a method of achieving a fastening connection through the size difference of parts, that is, the outer ring size of the bearing 33 is slightly larger than the third through hole 313, and the outer ring of the bearing 33 is assembled in the third through hole 313 by pressurizing. After assembly, the bearing and the third through hole 313 generate pressure and friction through elastic deformation, thereby achieving a fastening connection. The two bearings 33 are sleeved back to back on the rotating shaft 42, and the anti-loosening nut 331 of the rotating shaft applies the preload force to the inner ring of the bearing through the gasket 35. The inner ring of the bearing transmits the force to the rotating shaft through the interference fit, and the outer ring of the bearing is fixed in the third through hole of the rotating arm due to the interference fit. Compared with the sliding bearing in the prior art, the above-mentioned bearing and gasket of the present application are combined to improve the rotation accuracy and axial clearance control ability of the rotating arm, thereby further improving the precise positioning of the position of the reflector, thereby improving the measurement accuracy of the picosecond transient absorption spectroscopy system. In addition, the bearing in the present application can adopt P5 grade precision bearings (corresponding to the national standard: GB / T 307.3-2017 "General Technical Rules for Rolling Bearings" Level 5). P5 grade precision bearings have higher rotation accuracy, more stable operation after assembly, better hardness and wear resistance, can greatly improve fatigue resistance, and have a long maintenance cycle.

[0033] like Figure 2As shown, the drive assembly also includes a rail bracket 24 and a lead screw 25. The rail bracket 24 is bolted to the bottom plate 1. A mounting groove (not shown in the figure) is formed inside the rail 22. The lead screw 25 is arranged along the extension direction of the mounting groove and fixed to the rail 22. The slider 23 is a hollow structure. The slider 23 is sleeved on the lead screw 25 and the rail 22. The inner hole of the slider 23 cooperates with the nut on the lead screw 25. The outer surface of the slider 23 contacts the groove wall of the rail 22. The rail 22 is bolted to the rail bracket 24. The drive motor 21 is located at one end of the rail 22 close to the bottom plate 1 and is connected to one end of the lead screw 25 through a coupling. When the drive motor 21 is started, it drives the lead screw 25 to rotate, and the nut on the lead screw 25 drives the slider 23 to make a linear motion in the rail 22 along the axis direction of the lead screw 25. In the embodiment of the present application, since the slider 23 cooperates with the lead screw 25 and the slide rail 22 at the same time, it can move accurately along the guide of the slide rail 22 under the drive of the lead screw 25, and multiple components are arranged on the slide rail bracket 24, making the overall structure more compact and saving installation space. At the same time, the slider 23 moves in the slide rail 22 and is constrained by the slide rail, which can effectively prevent the slider from deflecting or shaking during the movement, thereby improving the stability and accuracy of the movement. In addition, in the present application, the drive motor can also be located in the slider, or the lead screw can also be located outside the slide rail and arranged in parallel with the slide rail. The specific embodiment is not limited in the present application.

[0034] Alternatively, if Figure 2 As shown, the driving assembly further includes a photoelectric switch 26 and a photoelectric switch sensor sheet 27. The photoelectric switch 26 is disposed on the slide rail bracket 24. The photoelectric switch sensor sheet 27 is bolted to the slider 23. The photoelectric switch 26 is configured to stop the driving motor when triggered by the photoelectric switch sensor sheet 27. When the slider 23 moves along the length direction of the slide rail 22 until the protrusion 231 drives the rotating arm 31 to move the reflector 32 out of the main light path, the photoelectric switch sensor sheet 27 triggers the photoelectric switch 26, and the photoelectric switch 26 stops the driving motor 21.

[0035] Alternatively, if Figure 4As shown, the limiting ball head 53 is a limiting ball head screw 531, and the limiting ball head screw 531 includes a ball head 5311, a screw rod 5312 and a locking nut 5313. One end of the screw rod 5312 is threadedly connected to the first end 311 of the rotating arm, and the other end of the screw rod 5312 is connected to the ball head 5311. When in use, the locking nut 5313 is loosened, and the screw rod 5312 is rotated clockwise or counterclockwise to change the position of the ball head 5311. When the ball head 5311 is adjusted to a suitable position, the locking nut 5313 is tightened. In the present application, the height position of the rotating arm 31 from the base plate 1 can be adjusted by adjusting the limiting ball head screw 531, that is, the height position of the reflector 32 from the base plate 1 is fine-tuned. In addition, the ball head 5311 and the screw rod 5312 can be integrally formed or detachably connected, which is not limited in the present application embodiment.

[0036] Alternatively, if Figure 6 As shown, the raised portion 231 of the slider is a roller 2311, and the roller 2311 can rotate when abutting against the second end 312 of the rotating arm, and apply pressure to the second end 312 of the rotating arm during the rotation. At this time, due to the rotation of the roller 2311, there will be no serious wear and tear on the fixed position of the second end 312 of the rotating arm, so there is no need to replace the roller frequently, thereby reducing the number of maintenance times of the lens switching mechanism of the picosecond transient absorption spectroscopy system.

[0037] In addition, if Figure 6 As shown, when the reflector is located in the main light path, a gap is left between the roller 2311 and the second end 312 of the rotating arm. Since in the embodiment of the present application, the position of the reflector can be fine-tuned by the limiting ball screw, the gap leaves enough space for adjusting the position of the reflector, making the fine-tuning of the reflector more flexible.

[0038] Alternatively, if Figure 2 As shown, the reflector assembly also includes a light baffle 34, which is bolted to the first end 311 of the rotating arm. The light baffle 34 and the reflector 32 are arranged on both sides of the first end 311 of the rotating arm opposite to each other. The size of the light baffle 34 is larger than that of the reflector 32. The light baffle 34 is used to block stray light, optimize optical efficiency and ensure the stability of the optical path, thereby realizing the precise control and anti-interference ability of the lens switching mechanism of the picosecond transient absorption spectroscopy system.

[0039] The above is only an optional specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A lens switching mechanism for a picosecond transient absorption spectroscopy system, characterized in that: It comprises a driving component (2), a reflector component (3), a supporting component (4) and a limiting component (5); The driving assembly (2) comprises a driving motor (21), a slide rail (22) and a slider (23); the slider (23) is mounted on the slide rail (22), and a protrusion (231) is provided on the slider (23); the driving motor (21) drives the slider (23) to move longitudinally along the slide rail (22); The reflector assembly (3) comprises a rotating arm (31) and a reflector (32); the rotating arm (31) has a first end (311) and a second end (312) which are opposite to each other; the reflector (32) is arranged on the first end (311) of the rotating arm; and the protrusion (231) is located directly above the second end (312) of the rotating arm; The support assembly (4) comprises a support frame (41) and a rotating shaft (42); the rotating arm (31) is connected to the support frame (41) via the rotating shaft (42); and both ends of the rotating arm (31) rotate in a vertical plane with the rotating shaft (42) on the support frame (41) as the center; The limiting assembly (5) comprises a limiting bracket (51) and a limiting ball head (52); the limiting bracket (51) is fixed below the first end (311) of the rotating arm; a limiting hole (53) matching the limiting ball head (52) is provided on the limiting bracket (51); the limiting ball head (52) is fixed to the first end (311) of the rotating arm; when the limiting ball head (52) is located in the limiting hole (53), the reflector (32) is located in the main light path.

2. The lens switching mechanism of a picosecond transient absorption spectroscopy system as claimed in claim 1, characterized in that: The picosecond transient absorption spectroscopy system lens switching mechanism further comprises an elastic component (6), wherein the elastic component (6) comprises a tension spring (61), wherein one end of the tension spring (61) is connected to the first end (311) of the rotating arm, and the other end of the tension spring (61) is connected to the support frame (41).

3. The lens switching mechanism of a picosecond transient absorption spectroscopy system as claimed in claim 1, characterized in that: The picosecond transient absorption spectroscopy system lens switching mechanism further comprises a base plate (1), and the driving component (2), the supporting component (4) and the limiting component (5) are arranged on the base plate (1); The base plate (1) is provided with a first groove (11) and a second groove (12); one end of the support frame (41) and one end of the limit bracket (51) are respectively located in the first groove (11) and the second groove (12), and are bolted to the first groove (11) and the second groove (12).

4. A lens switching mechanism for a picosecond transient absorption spectroscopy system as claimed in claim 3, characterized in that: A third groove (411) is provided at one end of the support frame (41) away from the bottom plate (1); a first through hole (4111) and a second through hole (4112) are provided on the side wall of the third groove (411) in opposite relation; a third through hole (313) is provided at the portion of the rotating arm (31) located in the third groove (411); and the rotating shaft (42) passes through the first through hole (4111), the third through hole (313) and the second through hole (4112); The reflector assembly (3) further comprises two bearings (33), the outer rings of the two bearings (33) being interference fit with the third through hole (313) of the rotating arm, and the inner rings of the bearings (33) being sleeved on the rotating shaft (42).

5. The lens switching mechanism of a picosecond transient absorption spectroscopy system as claimed in claim 4, characterized in that: The reflector assembly (3) further comprises two gaskets (35), wherein the two gaskets (35) are respectively arranged between the two bearings (33) and the inner wall of the third groove (411).

6. The lens switching mechanism of a picosecond transient absorption spectroscopy system as claimed in claim 1, characterized in that: The limiting ball head (52) is a limiting ball head screw (531), and the limiting ball head screw (531) comprises a ball head (5311), a screw rod (5312) and a locking nut (5313), one end of the screw rod (5312) is threadedly connected to the first end (311) of the rotating arm, the other end of the screw rod (5312) is connected to the ball head (5311), and the locking nut (5313) is configured to fix the screw rod (5312).

7. The lens switching mechanism of a picosecond transient absorption spectroscopy system as claimed in claim 3, characterized in that: The drive assembly (2) further comprises a slide rail bracket (24) and a lead screw (25), wherein the slide rail bracket (24) is bolted to the base plate (1), a mounting groove is formed inside the slide rail (22), the lead screw (25) is arranged along the extension direction of the mounting groove and is fixed to the slide rail (22), the slider (23) is a hollow structure, the slider (23) is sleeved on the lead screw (25) and the slide rail (22), the inner hole of the slider (23) cooperates with the nut on the lead screw (25), the outer surface of the slider (23) contacts the groove wall of the slide rail (22), the slide rail (22) is bolted to the slide rail bracket (24), and the drive motor (21) is located at one end of the slide rail (22) close to the base plate (1).

8. The lens switching mechanism of a picosecond transient absorption spectroscopy system as claimed in claim 7, characterized in that: The driving assembly (2) further comprises a photoelectric switch (26) and a photoelectric switch sensing sheet (27), wherein the photoelectric switch (26) is arranged on the slide rail bracket (24), the photoelectric switch sensing sheet (27) is bolted to the slide block (23), and the photoelectric switch (26) is configured to stop the operation of the driving motor (21) when triggered by the photoelectric switch sensing sheet (27); Wherein, when the slide block (23) moves along the length direction of the slide rail (22) until the protrusion (231) drives the rotating arm (31) to move the reflector (32) out of the main light path, the photoelectric switch sensor sheet (27) triggers the photoelectric switch (26).

9. The lens switching mechanism of a picosecond transient absorption spectroscopy system as claimed in claim 1, characterized in that: The raised portion (231) of the sliding block (23) is a roller (2311).

10. The lens switching mechanism of a picosecond transient absorption spectroscopy system as claimed in claim 2, characterized in that: The elastic component (6) further comprises a first fixing ring (62) and a second fixing ring (63), wherein the first fixing ring (62) is bolted to the first end (311) of the rotating arm, and the second fixing ring (63) is bolted to an end of the support frame (41) away from the rotating arm (31), and through holes are provided on the first fixing ring (62) and the second fixing ring (63), and the two ends of the tension spring (61) are respectively hooked in the through holes of the first fixing ring (62) and the second fixing ring (63).

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