Mode switching equipment for magneto-optical Kerr measurement and switching method thereof

Abstract

The invention belongs to the technical field of optical measurement, and discloses a mode switching device for magneto-optical Kerr measurement and a switching method thereof.The mode switching device comprises a base, a top opening formed in the top of the base and a permanent magnet arranged in the base, a fixed clamping frame is fixedly connected to the top of the base, a movable clamping frame is arranged above the fixed clamping frame, and the movable clamping frame is fixedly connected to the top of the base. A negative pressure linkage mechanism is fixedly arranged on the outer side of the movable clamping frame, and a negative pressure control mechanism is arranged on the front face of the base. Through cooperation of the driving rotation mechanism, the installation assembly and the switching assembly, when magneto-optical Kerr measurement is carried out, deflection control over the incident angle of emitted light is completed, rapid measurement after multi-angle switching is achieved, meanwhile, multiple sets of lasers on the outer side of the switching assembly are matched, switching processing of the lasers of different specifications is completed under rotation of the switching assembly, and the measurement precision is improved. Therefore, measurement processing of different emitted light is completed, double switching processing is rapidly achieved, the mode switching efficiency is greatly improved, and the use effect is good.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical measurement, and in particular relates to a mode switching device for magneto-optical Kerr measurement and a switching method thereof. Background Art

[0002] The mode switching device used in magneto-optical Kerr measurement refers to a device that can change the light irradiation mode or optical path of the sample. Its main purpose is to switch between different magnetization states or different optical modes during the measurement process in order to obtain accurate magneto-optical Kerr effect signals.

[0003] The mode switching device used for magneto-optical Kerr measurement in the prior art needs to switch the measurement mode during use, in order to achieve comprehensive measurement processing for the sample to be measured, reflect the true optical performance of the sample to be measured, and adapt to different experimental requirements. However, in the actual measurement process, the actual switching operation is inconvenient, the modes that can be switched are limited, it is difficult to achieve comprehensive multi-requirement switching measurement, and the use effect is poor. Summary of the Invention

[0004] The object of the present invention is to provide a mode switching device and a switching method thereof for magneto-optical Kerr measurement, so as to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mode switching device for magneto-optical Kerr measurement and a switching method thereof, comprising a base, a top opening opened at the top of the base, and a permanent magnet arranged inside the base, the top of the base is fixedly connected to a fixed clamping frame, a movable clamping frame is provided above the fixed clamping frame, a negative pressure linkage mechanism is fixedly provided on the outer side of the movable clamping frame, a negative pressure control mechanism is provided on the front side of the base, the negative pressure control mechanism controls the movable clamping frame to move downward through the negative pressure linkage mechanism, a driving rotation assembly is fixedly provided on the top of the base, a vertical plate is fixedly connected to the top of the base, the front side of the vertical plate is rotatably provided with an installation assembly, the internal rotation of the installation assembly is provided with a switching assembly, the outer side of the switching assembly is fixedly connected to a laser, and the driving rotation assembly controls the deflection of the installation assembly.

[0006] Preferably, the driving rotation mechanism includes a bracket, gear 1 and gear 2, the bracket is provided with a motor, the gear 1 is fixedly connected to the output shaft of the motor, the gear 2 is fixed to one end of the mounting assembly, and the gear 2 is meshed with the gear 1.

[0007] Preferably, the mounting assembly includes a rotating shaft, a mounting head and an adaptor slot, the rotating shaft is rotatably mounted on the vertical plate through a bearing, the mounting head is fixedly connected to the end of the rotating shaft, and the adaptor slot is provided at the bottom of the mounting head.

[0008] Preferably, the switching assembly includes a mounting block, a fixed shaft, gear three, a tooth plate and an electric push rod, the mounting block is movably arranged in an adapter groove, the fixed shaft is fixedly connected to the front side of the mounting block, and the fixed shaft is rotatably sleeved on the front side of the mounting head, the gear three is fixedly sleeved on the outer side of the fixed shaft, the electric push rod is fixed on the mounting head, the movable end of the electric push rod is fixedly connected to the tooth plate, and the tooth plate is meshed with gear three, and the laser is fixed on the outer side of the mounting block.

[0009] Preferably, a cleaning pad is fixedly provided above the interior of the adapting groove, and the cleaning pad is located on the rotation path of the laser.

[0010] Preferably, the negative pressure linkage mechanism includes a connecting rod, a spring 1, a connecting frame and a sleeve, the connecting rod is fixedly connected to the side of the movable clamping frame, the connecting frame is fixed inside the base, the sleeve is fixedly connected to the top of the connecting frame, the lower end of the connecting rod is movably sleeved in the sleeve, one end of the spring 1 is fixedly connected to the connecting rod, and the other end of the spring 1 is fixed in the connecting frame, and the connecting frame is connected to the negative pressure control mechanism.

[0011] Preferably, the negative pressure control mechanism includes a negative pressure pump, a control valve and a connecting pipe, the control valve is connected to the suction end of the negative pressure pump, one end of the connecting pipe is connected to the suction end of the control valve, and the other end of the connecting pipe is connected to the connecting frame.

[0012] Preferably, a suction pipe is fixedly provided on one side of the control valve, and the suction pipe is a hose.

[0013] Preferably, auxiliary switching parts are provided on both sides of the permanent magnet, and the auxiliary switching parts include a connecting shaft, a ring and a magnetic block. One end of the connecting shaft is fixedly connected to the permanent magnet, and the other end of the connecting shaft is movable through the base. The ring is fixedly sleeved on the outer end of the connecting shaft, and the magnetic block is symmetrically fixed and nested on the inner wall of the ring. A metal plate is fixedly connected to the side of the base, and the metal plate is located on the rotation path of the magnetic block.

[0014] A switching method for a mode switching device for magneto-optical Kerr measurement, comprising the following switching steps:

[0015] Step 1: When using, open the workpiece to be tested and place it on top of the fixed clamping frame. Start the negative pressure pump to suck air from the negative pressure linkage mechanism through the control valve and the connecting pipe, so that the negative pressure linkage mechanism forms a negative pressure. Under the negative pressure state, the movable clamping frame moves downward to clamp the workpiece to be tested.

[0016] Step 2: The permanent magnet at the bottom creates a magnetic field toward the DUT. The laser is then activated, emitting light toward the DUT, and optical measurement is performed in conjunction with the external measuring terminal.

[0017] Step 3: When adjusting the angle, start the motor in the driving rotation mechanism to deflect the mounting assembly, thereby driving the switching assembly and the laser on the switching assembly to deflect, changing the incident angle of the top of the test piece to achieve angle switching;

[0018] Step 4: When the emission light needs to be changed, start the switching component and rotate it to drive the lasers of different specifications to rotate downwards and switch the emission light;

[0019] Step 5: When the direction of the magnetic field needs to be changed, rotate the auxiliary switching part to flip the permanent magnet, change the top polarity, switch the direction of the magnetic field, and perform measurements after switching.

[0020] The beneficial effects of the present invention are as follows:

[0021] (1) The present invention utilizes the cooperation of a driving rotation mechanism, a mounting assembly, and a switching assembly to complete the deflection control of the incident angle of the emitted light during magneto-optical Kerr measurement, thereby realizing quick measurement after multi-angle switching. At the same time, the present invention cooperates with multiple groups of lasers on the outside of the switching assembly to complete the switching processing of lasers of different specifications under the rotation of the switching assembly, thereby completing the measurement processing of different emitted lights, quickly realizing dual switching processing, greatly improving the efficiency of mode switching, and having a good use effect.

[0022] (2) The present invention utilizes a switching component to drive the rotation control of multiple groups of lasers on the outside, and cooperates with a cleaning pad installed in the installation component. After various mode switching measurements, the rotation control of each group of lasers is controlled again, and during the rotation process, the lasers are squeezed and rubbed with the top cleaning pad, and the elastic cleaning pad is used to complete the cleaning process of the laser emission end, thereby avoiding contamination and causing the subsequent switching measurement effect to deteriorate, and the use effect is good.

[0023] (3) The present invention realizes the flipping control of the permanent magnet by utilizing the flipping and magnetic attraction control of the rotation auxiliary switching part. According to the actual measurement requirements, the permanent magnet is quickly flipped and fixed through the magnetic attraction positioning after rotation, and the direction of the magnetic field is changed, thereby completing further rapid measurement mode switching. The operation is simple and the use effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 is a schematic cross-sectional view of the base of the present invention;

[0026] Figure 3 A side view of the base of the present invention;

[0027] Figure 4 This is a schematic diagram of the installation of the installation component and the switching component of the present invention;

[0028] Figure 5 Schematic diagram of the explosion of the negative pressure linkage mechanism of the present invention;

[0029] Figure 6 Schematic diagram of the connection between the permanent magnet and the auxiliary switching component of the present invention.

[0030] In the figure: 1. base; 2. top opening; 3. movable clamping frame; 4. fixed clamping frame; 5. negative pressure linkage mechanism; 51. connecting rod; 52. spring 1; 53. connecting frame; 54. sleeve; 6. negative pressure pump; 7. control valve; 8. connecting pipe; 9. suction pipe; 10. bracket; 11. gear 1; 12. gear 2; 13. mounting assembly; 131. rotating shaft; 132. mounting head; 133. adapter slot; 14. switching assembly; 141. mounting block; 142. fixed shaft; 143. gear 3; 144. gear plate; 145. electric push rod; 15. laser; 16. permanent magnet; 17. auxiliary switching part; 171. connecting shaft; 172. collar; 173. magnetic block; 18. metal plate; 19. cleaning pad; 20. vertical plate. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] like Figures 1 to 6 As shown, an embodiment of the present invention provides a mode switching device for magneto-optical Kerr measurement and a switching method thereof, comprising a base 1, a top opening 2 opened on the top of the base 1, and a permanent magnet 16 arranged inside the base 1, a fixed clamping frame 4 is fixedly connected to the top of the base 1, a movable clamping frame 3 is provided above the fixed clamping frame 4, a negative pressure linkage mechanism 5 is fixedly provided on the outer side of the movable clamping frame 3, a negative pressure control mechanism is provided on the front side of the base 1, the negative pressure control mechanism controls the movable clamping frame 3 to move downward through the negative pressure linkage mechanism, a driving rotation assembly is fixedly provided on the top of the base 1, a vertical plate 20 is fixedly connected to the top of the base 1, a mounting assembly 13 is provided on the front side of the vertical plate 20, a switching assembly 14 is provided on the inner side of the mounting assembly 13, a laser 15 is fixedly connected to the outer side of the switching assembly 14, and the driving rotation assembly controls the deflection of the mounting assembly 13.

[0033] Example 1: When in use, the workpiece to be tested is opened and placed on the top of the fixed clamping frame 4, and the negative pressure pump 6 is started. The air in the connecting frame 53 of the negative pressure linkage mechanism 5 is sucked through the control valve 7 and the connecting pipe 8, so that a negative pressure is formed inside the connecting frame 53 of the negative pressure linkage mechanism 5. Under the negative pressure state, the connecting rod 51 is driven to move downward along the sleeve 54, and the spring 1 52 is compressed, and the movable clamping frame 3 is driven to move downward, and cooperate with the fixed clamping frame 4 to clamp the workpiece to be tested. The permanent magnet 16 below establishes a magnetic field toward the workpiece to be tested, and then the laser 15 is started so that the laser 15 emits light toward the workpiece to be tested, and cooperates with the external measuring end to perform optical measurement. When adjusting the angle, the motor in the driving rotation mechanism is started to rotate the gear 11 and drive the meshing gear 2 12 to rotate, thereby driving the rotating shaft 131 to rotate through the gear 2 12, so that the installation The mounting assembly 13 deflects, thereby driving the switching assembly 14 installed in the mounting head 132 and the laser 15 on the switching assembly 14 to deflect, and the inclination angle of the emission end of the laser 15 changes, changing the incident angle of the top of the workpiece to be measured, and realizing the measurement after the angle switching; when the emission light needs to be replaced, the electric push rod 145 in the switching assembly 14 is started to drive the gear plate 144 to move, and the gear plate 144 drives the gear three 143 to rotate, so that the fixed shaft 142 drives the mounting block 141 to rotate, thereby driving the lasers 15 of different specifications to rotate and switch to the bottom, and different measurement emission lights are switched by lasers 15 of different specifications; and after use, by repeatedly controlling the forward and reverse rotation of the mounting block 141, the different lasers 15 on the outside are driven to flip to the top, and rub against the cleaning pad 19 in the adapter groove 133 to complete the cleaning of the emission end of the laser 15.

[0034] First, by utilizing the cooperation of the driving rotation mechanism, the mounting component 13 and the switching component 14, the deflection control of the incident angle of the emitted light is completed when performing magneto-optical Kerr measurement, and quick measurement after multi-angle switching is achieved. At the same time, in conjunction with the multiple groups of lasers 15 outside the switching component 14, the switching processing of lasers 15 of different specifications is completed under the rotation of the switching component 14, and then the measurement processing of different emitted lights is completed, and the dual switching processing is quickly realized, which greatly improves the efficiency of mode switching and has a good use effect.

[0035] In addition, by utilizing the switching component 14 to drive the rotation control of multiple groups of lasers 15 on the outside, and cooperating with the cleaning pad 19 installed in the mounting component 13, after various mode switching measurements, the rotation control of each group of lasers 15 is controlled again, and during the rotation process, it is squeezed and rubbed with the top cleaning pad 19, and in conjunction with the elastic cleaning pad 19, the cleaning process of the emitting end of the laser 15 is completed, avoiding contamination and causing the subsequent switching measurement effect to deteriorate, and the use effect is good.

[0036] Example 2: When the direction of the magnetic field needs to be changed, the auxiliary switching part 17 is rotated to rotate the ring 172, thereby driving the two groups of magnetic blocks 173 on the inner side to flip, and driving the permanent magnet 16 to flip during the flipping, changing the top polarity, switching the direction of the magnetic field, and performing measurements after the switching. After the flipping, the magnetic blocks 173 distributed above and below are magnetically fixed to the metal plate 18 in the fixed position, completing the position fixation after the switching.

[0037] First, by utilizing the flipping and magnetic control of the rotation auxiliary switching part 17, the flipping control of the permanent magnet 16 is realized. According to the actual measurement requirements, the magnetic positioning after rotation is used to quickly realize the flipping and fixing of the permanent magnet, and the change of the magnetic field direction is completed, thereby completing further rapid measurement mode switching. The operation is simple and the use effect is good.

[0038] Among them, the driving rotation mechanism includes a bracket 10, gear 1 11 and gear 2 12. A motor is provided in the bracket 10, gear 1 11 is fixedly connected to the output shaft of the motor, gear 2 12 is fixed to one end of the mounting assembly 13, and gear 2 12 is meshed with gear 1 11.

[0039] The rotation of the mounting assembly 13 is controlled by driving the rotation mechanism to change the incident angle of the light.

[0040] Among them, the mounting assembly 13 includes a rotating shaft 131, a mounting head 132 and an adapting groove 133. The rotating shaft 131 is rotatably mounted on the vertical plate 20 through a bearing, the mounting head 132 is fixedly connected to the end of the rotating shaft 131, and the adapting groove 133 is opened at the bottom of the mounting head 132.

[0041] The mounting assembly 13 realizes the mounting support of the switching assembly 14 , and the adapting groove 133 adapts to the rotation of the laser 15 and provides an installation space for the cleaning pad 19 .

[0042] Among them, the switching component 14 includes a mounting block 141, a fixed shaft 142, a gear three 143, a tooth plate 144 and an electric push rod 145. The mounting block 141 is movably set in the adapter groove 133, the fixed shaft 142 is fixedly connected to the front of the mounting block 141, and the fixed shaft 142 is rotatably sleeved on the front of the mounting head 132, the gear three 143 is fixedly sleeved on the outer surface of the fixed shaft 142, the electric push rod 145 is fixed on the mounting head 132, the movable end of the electric push rod 145 is fixedly connected to the tooth plate 144, and the tooth plate 144 is meshed with the gear three 143, and the laser 15 is fixed on the outer surface of the mounting block 141.

[0043] The switching assembly 14 drives the gear 3 143 to rotate through the gear plate 144, and realizes the position switching of the multiple groups of lasers 15 under forward and reverse rotation, thereby realizing mode switching processing.

[0044] A cleaning pad 19 is fixedly provided above the interior of the adapting groove 133 , and the cleaning pad 19 is located on the rotation path of the laser 15 .

[0045] By utilizing the cleaning pad 19, the end portion of the laser 15 is automatically cleaned during its rotation, and the operation is simple.

[0046] Among them, the negative pressure linkage mechanism 5 includes a connecting rod 51, a spring 52, a connecting frame 53 and a sleeve 54. The connecting rod 51 is fixedly connected to the side of the movable clamping frame 3, the connecting frame 53 is fixed inside the base 1, and the sleeve 54 is fixedly connected to the top of the connecting frame 53. The lower end of the connecting rod 51 is movably sleeved in the sleeve 54. One end of the spring 52 is fixedly connected to the connecting rod 51, and the other end of the spring 52 is fixed in the connecting frame 53. The connecting frame 53 is connected to the negative pressure control mechanism. The negative pressure control mechanism includes a negative pressure pump 6, a control valve 7 and a connecting pipe 8. The control valve 7 is connected to the suction end of the negative pressure pump 6, one end of the connecting pipe 8 is connected to the suction end of the control valve 7, and the other end of the connecting pipe 8 is connected to the connecting frame 53.

[0047] The negative pressure linkage mechanism 5 cooperates with the negative pressure control mechanism to realize the movement control of the movable clamping frame 3 through negative pressure control, completes the rapid clamping and fixation of the test piece after it is laid flat, and maintains stability during the measurement process.

[0048] Among them, a suction pipe 9 is fixedly provided on one side of the control valve 7, and the suction pipe 9 is a hose.

[0049] By using the suction pipe 9, when the control valve 7 switches the suction direction, the top of the workpiece with the top fixed is sucked through the suction pipe 9 to remove particles attached to the top surface of the workpiece, ensuring stable measurement after subsequent laser injection.

[0050] Among them, auxiliary switching parts 17 are provided on both sides of the permanent magnet 16, and the auxiliary switching parts 17 include a connecting shaft 171, a ring 172 and a magnetic block 173. One end of the connecting shaft 171 is fixedly connected to the permanent magnet 16, and the other end of the connecting shaft 171 is movable through the base 1. The ring 172 is fixedly sleeved on the outer end of the connecting shaft 171, and the magnetic block 173 is symmetrically fixed and nested on the inner wall of the ring 172. The side of the base 1 is fixedly connected with a metal plate 18, and the metal plate 18 is located on the rotation path of the magnetic block 173.

[0051] The permanent magnet 16 generates a magnetic field and acts on the DUT area to perform magneto-optical Kerr measurement. The auxiliary switching unit 17 switches the direction of the permanent magnet 16, thereby completing the switching of the magnetic field direction and further completing the measurement mode switching.

[0052] A switching method for a mode switching device for magneto-optical Kerr measurement, comprising the following switching steps:

[0053] Step 1: When in use, the workpiece to be tested is opened and placed on top of the fixed clamping frame 4. The negative pressure pump 6 is started to suck air from the negative pressure linkage mechanism 5 through the control valve 7 and the connecting pipe 8, so that the negative pressure linkage mechanism 5 forms a negative pressure. Under the negative pressure, the movable clamping frame 3 moves downward to clamp the workpiece to be tested.

[0054] Step 2: The permanent magnet 16 at the bottom creates a magnetic field toward the DUT, and then the laser 15 is activated, causing the laser 15 to emit light toward the DUT, and optical measurement is performed in conjunction with the external measuring terminal.

[0055] Step 3: When adjusting the angle, the motor in the driving rotation mechanism is started to deflect the mounting assembly 13, thereby driving the switching assembly 14 and the laser 15 on the switching assembly 14 to deflect, changing the incident angle of the top of the test piece to achieve angle switching;

[0056] Step 4: When the emission light needs to be changed, the switching component 14 is started and rotated, driving the lasers 15 of different specifications to rotate downwards and switch the emission light;

[0057] Step 5: When the direction of the magnetic field needs to be changed, the auxiliary switching part 17 is rotated to flip the permanent magnet 16, change the top polarity, switch the direction of the magnetic field, and perform the measurement after the switch.

[0058] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A mode switching device for magneto-optical Kerr measurement, comprising a base (1), a top opening (2) provided on the top of the base (1), and a permanent magnet (16) disposed inside the base (1), characterized in that: The top of the base (1) is fixedly connected to a fixed clamping frame (4), a movable clamping frame (3) is provided above the fixed clamping frame (4), a negative pressure linkage mechanism (5) is fixedly provided on the outer side of the movable clamping frame (3), a negative pressure control mechanism is provided on the front side of the base (1), and the negative pressure control mechanism controls the movable clamping frame (3) to move downward through the negative pressure linkage mechanism, a driving rotation component is fixedly provided on the top of the base (1), a vertical plate (20) is fixedly connected to the top of the base (1), a mounting component (13) is provided on the front side of the vertical plate (20), a switching component (14) is provided on the inner side of the mounting component (13), a laser (15) is fixedly connected to the outer side of the switching component (14), and the driving rotation component controls the deflection of the mounting component (13).

2. A mode switching device for magneto-optical Kerr measurement according to claim 1, characterized in that: The driving rotation mechanism comprises a bracket (10), a gear 1 (11) and a gear 2 (12); a motor is provided in the bracket (10); the gear 1 (11) is fixedly connected to the output shaft of the motor; the gear 2 (12) is fixed to one end of the mounting assembly (13); and the gear 2 (12) is meshedly connected to the gear 1 (11).

3. The mode switching device for magneto-optical Kerr measurement according to claim 2, characterized in that: The mounting assembly (13) comprises a rotating shaft (131), a mounting head (132) and an adapting groove (133); the rotating shaft (131) is rotatably mounted on the vertical plate (20) via a bearing; the mounting head (132) is fixedly connected to the end of the rotating shaft (131); and the adapting groove (133) is provided at the bottom of the mounting head (132).

4. The mode switching device for magneto-optical Kerr measurement according to claim 3, characterized in that: The switching assembly (14) includes a mounting block (141), a fixed shaft (142), a gear three (143), a tooth plate (144) and an electric push rod (145); the mounting block (141) is movably arranged in the adapting groove (133); the fixed shaft (142) is fixedly connected to the front of the mounting block (141), and the fixed shaft (142) is rotatably sleeved on the front of the mounting head (132); the gear three (143) is fixedly sleeved on the outer surface of the fixed shaft (142); the electric push rod (145) is fixed on the mounting head (132); the movable end of the electric push rod (145) is fixedly connected to the tooth plate (144), and the tooth plate (144) is meshed with the gear three (143); the laser (15) is fixed on the outer surface of the mounting block (141).

5. The mode switching device for magneto-optical Kerr measurement according to claim 4, characterized in that: A cleaning pad (19) is fixedly provided above the interior of the adapting groove (133), and the cleaning pad (19) is located on the rotation path of the laser (15).

6. The mode switching device for magneto-optical Kerr measurement according to claim 5, characterized in that: The negative pressure linkage mechanism (5) comprises a connecting rod (51), a spring (52), a connecting frame (53) and a sleeve (54), wherein the connecting rod (51) is fixedly connected to the side of the movable clamping frame (3), the connecting frame (53) is fixed inside the base (1), the sleeve (54) is fixedly connected to the top of the connecting frame (53), the lower end of the connecting rod (51) is movably sleeved in the sleeve (54), one end of the spring (52) is fixedly connected to the connecting rod (51), and the other end of the spring (52) is fixed in the connecting frame (53), and the connecting frame (53) is connected to the negative pressure control mechanism.

7. The mode switching device for magneto-optical Kerr measurement according to claim 6, characterized in that: The negative pressure control mechanism comprises a negative pressure pump (6), a control valve (7) and a connecting pipe (8), wherein the control valve (7) is connected to the suction end of the negative pressure pump (6), one end of the connecting pipe (8) is connected to the suction end of the control valve (7), and the other end of the connecting pipe (8) is connected to the connecting frame (53).

8. The mode switching device for magneto-optical Kerr measurement according to claim 7, characterized in that: A suction pipe (9) is fixedly provided on one side of the control valve (7), and the suction pipe (9) is a hose.

9. The mode switching device for magneto-optical Kerr measurement according to claim 8, characterized in that: Auxiliary switching parts (17) are provided on both sides of the permanent magnet (16). The auxiliary switching parts (17) include a connecting shaft (171), a collar (172) and a magnetic block (173). One end of the connecting shaft (171) is fixedly connected to the permanent magnet (16), and the other end of the connecting shaft (171) is movable through the base (1). The collar (172) is fixedly sleeved on the outer end of the connecting shaft (171). The magnetic block (173) is symmetrically fixed and nested on the inner wall of the collar (172). A metal plate (18) is fixedly connected to the side of the base (1), and the metal plate (18) is located on the rotation path of the magnetic block (173).

10. The switching method of a mode switching device for magneto-optical Kerr measurement according to claim 9, characterized in that: The switching steps include the following: Step 1: When in use, the test piece is opened and placed on the top of the fixed clamping frame (4), and the negative pressure pump (6) is started to suck the air in the negative pressure linkage mechanism (5) through the control valve (7) and the connecting pipe (8), so that the negative pressure linkage mechanism (5) forms a negative pressure, and under the negative pressure state, the movable clamping frame (3) is driven downward to clamp the test piece; Step 2: The permanent magnet (16) below establishes a magnetic field toward the object to be measured, and then the laser (15) is started, so that the laser (15) emits light toward the object to be measured, and optical measurement is performed in conjunction with the external measuring end; Step 3: When adjusting the angle, the motor in the driving rotation mechanism is started to deflect the mounting assembly (13), thereby driving the switching assembly (14) and the laser (15) on the switching assembly (14) to deflect, thereby changing the incident angle of the top of the test piece and achieving angle switching; Step 4: When the emission light needs to be changed, the switching component (14) is started and rotated, driving the lasers (15) of different specifications to rotate downwards and switch the emission light; Step 5: When the direction of the magnetic field needs to be changed, the auxiliary switching part (17) is rotated to flip the permanent magnet (16), change the top polarity, switch the direction of the magnetic field, and perform the measurement after the switch.

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