Grating Monochromator

Abstract

The present invention belongs to the technical field of optical instruments, and particularly relates to a grating monochromator, comprising a plane mirror and a grating arranged with their working surfaces facing each other, and a spacing maintaining unit for limiting the spacing between the working surfaces of the plane mirror and the grating is provided between the plane mirror and the grating. In the present invention, the spacing maintaining unit ensures that there is always a gap between the plane mirror and the grating, thereby protecting the working surfaces of the two from collision damage.

Description

Technical Field

[0001] The invention belongs to the technical field of optical instruments, and in particular relates to a grating monochromator. Background Art

[0002] The monochromator is used to decompose the incident light into monochromatic light and accurately "extract" the required wavelength of light. As the name suggests, the variable inclusion angle grating monochromator is a grating monochromator with a variable inclusion angle during operation. Its principle is shown in the attached figure. Figure 1 As shown, the light emitted by the light source is collimated and then incident on the plane mirror 1 in parallel, and the plane mirror 1 reflects the light to the grating 2 to obtain diffracted light. Among them, the incident angle of the grating 2 is α, the diffraction angle is β, and the included angle of the grating 2 is φ=α+β.

[0003] During operation, the directions of the incident light of plane mirror 1 and the outgoing light of grating 2 remain unchanged. Grating 2 is a variable line spacing grating, and its focusing position on the light remains unchanged. During operation, plane mirror 1 and grating 2 need to rotate at corresponding angles to obtain monochromatic light of different energies. According to optical design calculations, grating 2 can only rotate around the center of its surface, and plane mirror 1 rotates off-axis to ensure that the center of the light spot of its reflected light beam is always located at the center of grating 2, that is, grating 2 rotates around point O, and plane mirror 1 rotates around point M. Optical design calculations determine the rotation center positions of grating 2 and plane mirror 1, as well as the lengths of grating 2 and plane mirror 1. Under normal working conditions, grating 2 and plane mirror 1 will not collide, but if human operating errors or driving mechanical failures occur, plane mirror 1 and grating 2 may collide, resulting in damage to expensive optical components and causing serious economic losses. Summary of the invention

[0004] The object of the present invention is to provide a grating monochromator which can avoid collision between a plane mirror and a grating during adjustment.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a grating monochromator, comprising a plane mirror and a grating arranged with their active surfaces facing each other, and a spacing maintaining unit is provided between the plane mirror and the grating to limit the spacing between their active surfaces.

[0006] Compared with the prior art, the present invention has the following technical effects: the spacing maintaining unit ensures that there is always a gap between the plane mirror and the grating, thereby protecting the working surfaces of the two from collision damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The following is a brief description of the contents and symbols in the drawings of this specification:

[0008] Figure 1 is the schematic diagram of the grating monochromator;

[0009] Figure 2 is a schematic diagram of the present invention;

[0010] Figure 3 yes Figure 2 A partial enlarged schematic diagram of

[0011] Figure 4 is a front view of the present invention;

[0012] Figure 5 yes Figure 4 BB cross-sectional view.

[0013] In the figure: 10. plane mirror, 11. base one, 111. connecting plate, 112. mounting plate, 20. grating, 21. base two, 211. bottom plate, 212. connecting arm, 30. grating limit plate, 31. grating limit part, 32. grating connecting part, 40. plane mirror limit plate, 41. plane mirror limit part, 42. plane mirror connecting part, 50. insulating pad, 60. base, 61. mounting arm, 62. mounting plate. DETAILED DESCRIPTION

[0014] The specific implementation of the present invention is further described in detail below through description of embodiments in conjunction with the accompanying drawings.

[0015] A grating monochromator comprises a plane mirror 10 and a grating 20 whose active surfaces are arranged facing each other, and a spacing maintaining unit for limiting the spacing between the active surfaces of the plane mirror 10 and the grating 20 is arranged between the plane mirror 10 and the grating 20.

[0016] The spacing maintaining unit includes a grating stopper 30 arranged at intervals from the active surface of the grating 20, and the grating stopper 30 includes a grating stopper 31 arranged adjacent to the active surface of the plane mirror 10 and having an outer surface parallel to the active surface of the grating 20. That is, the outer surface of the grating stopper 31 is parallel to the active surface of the grating 20 and is arranged at intervals on the side of the active surface of the grating 20 adjacent to the plane mirror 10, so that the grating stopper 31 always cooperates with the plane mirror 10 or its accessories before the active surface of the grating 20.

[0017] In actual application, when the grating limiter 31 contacts the plane mirror 10 or its accessories and forms an abutment fit, the grating 20 and the plane mirror 10 can be limited to move toward each other, and the distance between the two is prevented from further decreasing, thereby protecting the active surface of the grating 20. In this embodiment, the plane mirror 10 and the grating 20 are driven by motors respectively. Therefore, a further preferred solution is that the grating limiter 31 is a sensing element. When the grating limiter 31 senses that the distance between it and the plane mirror 10 or the marker on the side of the plane mirror 10 exceeds the limit, a sensing signal is sent. After the sensing signal is transmitted to the control center, the control center issues a command to stop the corresponding drive motor. In this way, only the grating limiter 30 is set, which can effectively avoid damage to the active surface of the grating 20 caused by collision.

[0018] The spacing maintaining unit includes a plane mirror stopper 40 arranged at intervals from the active surface of the plane mirror 10, and the plane mirror stopper 40 includes a plane mirror stopper 41 arranged adjacent to the active surface of the grating 20 and having an outer surface parallel to the active surface of the plane mirror 10. That is, the outer surface of the plane mirror stopper 41 is parallel to the active surface of the plane mirror 10 and is arranged at intervals on the side of the active surface of the plane mirror 10 adjacent to the grating 20. The plane mirror stopper 41 always cooperates with the grating 20 or its accessories before the active surface of the plane mirror 10. When the plane mirror stopper 41 contacts and abuts against the accessories of the grating 20, the grating 20 and the plane mirror 10 can be restricted from moving toward each other, and the distance between the two is prevented from being further reduced, thereby protecting the active surfaces of the plane mirror 10 and the grating 20. A further preferred solution is that the plane mirror stopper 41 is a sensing element. When the plane mirror stopper 41 senses that the distance between it and the grating 20 or the marker beside the grating 20 exceeds the limit, a sensing signal is sent. After the sensing signal is transmitted to the control center, the control center issues a command to stop the corresponding drive motor. In this way, only the plane mirror stopper 40 is provided, which can effectively avoid damage to the working surface of the plane mirror 10 and the grating 20 caused by collision.

[0019] In other words, the action surface of the limiter should be parallel to the action surface of the corresponding optical element, and the distance between the action surface of the limiter and the other optical element is smaller than the distance between the two optical elements. That is, the action surface of the grating limiter 31 is parallel to the grating 20, and the distance between its action surface and the plane mirror 10 is smaller than the distance between the grating 20 and the plane mirror 10; the action surface of the plane mirror limiter 41 is parallel to the plane mirror 10, and the distance between its action surface and the grating 20 is smaller than the distance between the plane mirror 10 and the grating 20.

[0020] When the grating stopper 30 and the plane mirror stopper 40 are provided at the same time, the action surface of the plane mirror stopper 41 is parallel to the action surface of the plane mirror 10, the action surface of the grating stopper 31 is parallel to the action surface of the grating 20, and the spacing between the action surfaces of the grating stopper 31 and the plane mirror 41 is smaller than the spacing between the plane mirror 10 and the grating 20. In this way, it can be ensured that the plane mirror stopper 41 and the grating stopper 31 are in abutment or inductive fit before the plane mirror 10 and the grating 20 contact, thereby preventing the plane mirror 10 and the grating 20 from continuing to move and causing the two to collide.

[0021] Specifically, the plane mirror limiter 41 and the grating limiter 31 are both sensing elements, and no sensing signal is generated when the plane mirror limiter 41 and the grating limiter 31 are separated, and a sensing signal is generated when they are in contact. After the sensing signal is transmitted to the control center, the control center issues a command to stop the corresponding drive motor.

[0022] This embodiment is shown in the attached Figure 5As shown, there is an interference region in the displacement paths of the plane mirror 10 and the grating 20, and the grating stopper 31 and the plane mirror stopper 41 are both located within the range between the plane mirror action surface and the plane where the grating action surface is located. To ensure the anti-collision effect, the grating stopper 31 extends from the end of the grating 20 adjacent to the plane mirror 10 to the center of the grating 20, and its extension length is greater than the length of the interference section between the plane mirror 10 and the grating 20. In other embodiments, the following scheme can also be adopted, the plane mirror stopper 41 extends from the end of the plane mirror 10 adjacent to the grating 20 to the center of the plane mirror 10, and its extension length is greater than the length of the interference section between the plane mirror 10 and the grating 20. In order to further prevent the grating stopper 31 and the plane mirror stopper 41 from deforming after contact and causing damage to the plane mirror 10 or the grating 20, in this embodiment, the grating stopper 31 and the plane mirror stopper 41 are arranged to avoid the action surface of the plane mirror 10 and the grating 10, and are arranged beside the plane mirror 10 and the grating 20.

[0023] In this embodiment, Figure 2-5 As shown, the plane mirror 10 is connected to the base 11, the plane mirror stopper 40 is fixedly connected to the base 11, the grating 20 is connected to the base 21, and the grating stopper 30 is fixedly connected to the base 21. The base 11 and the base 21 are driven by different motors. The base 11 and the base 21 are respectively hingedly connected to the base 60 and the hinge axes of the two are arranged in parallel and spaced apart. The rotation center a of the base 21 coincides with the surface center line of the grating 20, and the rotation center b of the base 11 is arranged separately from the mirror surface of the plane mirror 10.

[0024] The base 21 includes a bottom plate 211, both ends of which extend upward to form connecting arms 212, the grating 20 and the bottom plate 211 form a linear displacement fit, and the connecting arms 212 are hinged to the base 60; the base 60 includes mounting arms 61 arranged on both sides of the base 21 and hinged to the connecting arms 212, and a mounting plate 62 is arranged spaced apart from one of the mounting arms 61; the base 11 includes an L-shaped connecting plate 111 as a whole, the vertical plate of the connecting plate 111 is inserted between the connecting arm 212 and the mounting plate 62 and is hingedly connected to the mounting plate 62, and the horizontal plate extends to the side where the grating 20 is located and is connected to the plane mirror 10 through the plane mirror mounting plate 112.

[0025] In this embodiment, the plane mirror stopper 40 is mounted on the base 11, and the grating stopper 30 is mounted on the base 21. When the base 60 is placed horizontally, there is an overlap area between the grating stopper 30 and the plane mirror stopper 40 in the plumb direction. To ensure the accuracy of the sensing signal, the plane mirror stopper 40 is insulated from the base 11, and the grating stopper 30 is insulated from the base 21.

[0026] Specific as Figure 3As shown, one end of the plane mirror limiting portion 41 extends toward the side of the plane mirror 10 or the base 11 to form a plane mirror connecting portion 42, and an insulating pad 50 is provided at the connection between the plane mirror connecting portion 42 and the plane mirror 10 or the base 11; one end of the grating limiting portion 31 extends toward the side of the grating 20 or the base 21 to form a grating connecting portion 32, and an insulating pad 50 is provided at the connection between the grating connecting portion 32 and the grating 20 or the base 21.

[0027] In other embodiments, when the plane mirror limiting plate 40 is installed on the plane mirror 10 or other components, and the grating limiting plate 30 is installed on the grating 20 or other components, the connection should also be insulated.

Claims

1. A grating monochromator, comprising a plane mirror (10) and a grating (20) arranged with their active surfaces facing each other, characterized in that: A spacing maintaining unit for limiting the spacing between the active surfaces of the plane mirror (10) and the grating (20) is provided between the plane mirror (10) and the grating (20); The spacing maintaining unit comprises a grating limiting piece (30) and a plane mirror limiting piece (40); the grating limiting piece (30) comprises a grating limiting portion (31); an action surface of the grating limiting portion (31) adjacent to the plane mirror limiting piece (40) is parallel to an action surface of the grating (20); the plane mirror limiting piece (40) comprises a plane mirror limiting portion (41); an action surface of the plane mirror limiting portion (41) adjacent to the grating limiting piece (30) is parallel to an action surface of the plane mirror (10); and a spacing between the action surfaces of the grating limiting portion (31) and the plane mirror limiting portion (41) is smaller than a spacing between the plane mirror (10) and the grating (20); At least one of the plane mirror limiting portion (41) and the grating limiting portion (31) is a sensing element; when the plane mirror limiting portion (41) is far away from the grating (20) or the grating limiting portion (31), no sensing signal is generated, but when the two are close to each other, a sensing signal is generated; when the grating limiting portion (31) is far away from the plane mirror (10) or the plane mirror limiting portion (41), no sensing signal is generated, but when the two are close to each other, a sensing signal is generated.

2. The grating monochromator according to claim 1, characterized in that: The grating stop portion (31) extends from the end of the grating (20) adjacent to the plane mirror (10) to the center of the grating (20), and its extension length is greater than the length of the interference section between the plane mirror (10) and the grating (20), or the plane mirror stop portion (41) extends from the end of the plane mirror (10) adjacent to the grating (20) to the center of the plane mirror (10), and its extension length is also greater than the length of the interference section between the plane mirror (10) and the grating (20).

3. The grating monochromator according to claim 2, characterized in that: The plane mirror (10) is connected to the first base (11), the plane mirror limiting plate (40) is fixedly connected to the first base (11), the grating (20) is connected to the second base (21), and the grating limiting plate (30) is fixedly connected to the second base (21).

4. The grating monochromator according to claim 3, characterized in that: The plane mirror limiting piece (40) is insulated and connected to the plane mirror (10) or the first base (11), and the grating limiting piece (30) is insulated and connected to the grating (20) or the second base (21); one end of the plane mirror limiting portion (41) extends toward the side of the plane mirror (10) or the first base (11) to form a plane mirror connecting portion (42), and an insulating pad (50) is provided at the connection between the plane mirror connecting portion (42) and the plane mirror (10) or the first base (11); one end of the grating limiting portion (31) extends toward the side of the grating (20) or the second base (21) to form a grating connecting portion (32), and an insulating pad (50) is provided at the connection between the grating connecting portion (32) and the grating (20) or the second base (21).

5. The grating monochromator according to claim 4, characterized in that: The base one (11) and the base two (21) are respectively hingedly connected to the base (60) and the hinge axes of the two are arranged in parallel and spaced apart. The rotation center of the base two (21) coincides with the surface center line of the grating (20), and the rotation center of the base one (11) is arranged separately from the mirror surface of the plane mirror (10).

6. The grating monochromator according to claim 5, characterized in that: The second base (21) comprises a bottom plate (211), two ends of the bottom plate (211) extend upward to form a connecting arm (212), the grating (20) and the bottom plate (211) form a linear displacement fit, and the connecting arm (212) is hinged to the base (60); The base (60) comprises mounting arms (61) arranged on both sides of the second base (21) and hingedly connected to the connecting arms (212), wherein a mounting plate (62) is arranged spaced apart from the mounting arms (61) on the side thereof; The base 1 (11) comprises an L-shaped connecting plate (111), the vertical plate of the connecting plate (111) being inserted between the connecting arm (212) and the mounting plate (62) and being hingedly connected to the mounting plate (62), and the horizontal plate extending toward the side where the grating (20) is located and being connected to the plane mirror (10) through the plane mirror mounting plate (112).

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