Multi-grating spectrometer

Abstract

The invention discloses a multi-grating spectrometer, and belongs to the field of spectrum detection, a stop block is fixedly installed on a base, a grating assembly is rotatably installed on a rotary table, the rotation axis of the grating assembly does not coincide with the rotation axis of the rotary table, a limiting assembly is installed on the rotary table, and an installation frame of the grating assembly comprises a shifting rod. The driving structure drives the rotary table, the grating assembly and the limiting assembly to rotate relative to the base, in the process that the rotary table drives the grating assembly to rotate, when the rotary table rotates to a preset angle, the deflector rod abuts against the check block to enable the grating assembly to rotate relative to the rotary table, switching of the grating body is achieved, and the center line of the switched grating body coincides with the rotating axis of the rotary table. When the rotary table drives the grating assembly to rotate at the angle smaller than the preset angle, the grating body rotates around the rotating axis of the rotary table to conduct spectrum collection, through the design, when spectrum collection is conducted, the grating body only rotates and does not deflect, and the spectrum coverage range of the grating body is large.

Description

Technical Field

[0001] The invention relates to the field of spectrum detection, in particular to a multi-grating spectrometer. Background Art

[0002] The multi-grating spectrometer uses a motor to drive the grating device to rotate and realize the switching of different gratings. When collecting the spectrum after the grating is switched, it is sometimes necessary to rotate the corresponding grating by a certain angle to collect spectra in different bands. The existing spectrometer grating rotation center and the rotating platform center do not coincide, and the grating has both rotation and off-axis deflection. This will cause the grating size to not cover the spectral range, so the grating size needs to be increased. The grating is a high-precision optical part. As the size increases, its cost will increase greatly, and the accuracy will also decrease to a certain extent. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, one of the objectives of the present invention is to provide a multi-grating spectrometer in which the rotation center of a single grating coincides with the center of a rotating platform.

[0004] One of the purposes of the present invention is achieved by the following technical solution:

[0005] A multi-grating spectrometer comprises a base, a driving structure and a turntable drivingly connected to the driving structure, wherein the driving structure drives the turntable to rotate relative to the base, and the multi-grating spectrometer further comprises a stopper, a grating assembly and a limit assembly, wherein the stopper is fixedly mounted on the base, the grating assembly is rotatably mounted on the turntable, the rotation axis of the grating assembly does not coincide with the rotation axis of the turntable, the limit assembly is mounted on the turntable, the grating assembly comprises a mounting frame and a plurality of grating bodies located on the mounting frame, the mounting frame comprises a lever, the driving structure drives the turntable, the grating assembly and the limit assembly to rotate relative to the base, and during the process of the turntable driving the grating assembly to rotate, when the turntable rotates to a preset angle, the lever contacts the stopper to cause the grating assembly to rotate relative to the turntable, thereby realizing the switching of the grating body, at which time the center line of the grating body coincides with the rotation axis of the turntable, and when the turntable drives the grating assembly to rotate at an angle less than the preset angle, the grating body rotates around the rotation axis of the turntable to collect spectra.

[0006] Furthermore, the grating assembly also includes a bearing, which is connected to the mounting frame and rotates with the mounting frame. The bearing is provided with a plurality of limit grooves, and the limit assembly is snap-fitted with any of the limit grooves to position the switched grating body relative to the turntable.

[0007] Furthermore, the limiting component includes a slide rail, an elastic member and a limiting member, the slide rail is fixed to the turntable, the limiting member is slidably installed on the slide rail, two ends of the elastic member respectively contact the slide rail and the limiting member, and the elastic force of the elastic member causes the limiting member to extend into the limiting groove.

[0008] Furthermore, the limiting groove is V-shaped.

[0009] Furthermore, the mounting frame includes a first frame, a rotating shaft and a second frame, the first frame is fixed to the bottom end of the rotating shaft, the second frame is fixed to the top end of the rotating shaft, the lever is arranged on the first frame, and the grating body is installed between the first frame and the second frame.

[0010] Furthermore, the plurality of grating bodies are evenly distributed on the mounting frame, and the center lines of the plurality of grating bodies are located on a circumference.

[0011] Furthermore, the first frame and the second frame are both equilateral triangles.

[0012] Furthermore, the first frame also includes an extension portion, the extension portion is horizontally arranged, and the shifting rod extends from a terminal end of the extension portion and is perpendicular to the extension portion.

[0013] Furthermore, the number of the levers is equal to the number of the grating bodies, and the angle between two adjacent levers and the rotating shaft is greater than the rotation angle of the grating body when collecting the spectrum.

[0014] Furthermore, the driving structure is a worm gear.

[0015] Compared with the prior art, the multi-grating spectrometer of the present invention comprises a base, a driving structure and a turntable connected to the driving structure in a transmission manner, the driving structure drives the turntable to rotate relative to the base, the multi-grating spectrometer also comprises a stopper, a grating assembly and a limit assembly, the stopper is fixedly mounted on the base, the grating assembly is rotatably mounted on the turntable, the rotation axis of the grating assembly does not coincide with the rotation axis of the turntable, the limit assembly is mounted on the turntable, the grating assembly comprises a mounting frame and a plurality of grating bodies located on the mounting frame, the mounting frame comprises a lever, the driving structure drives the turntable, the grating assembly and the limit assembly to rotate relative to the base, the turntable During the process of the table driving the grating assembly to rotate, when the turntable rotates to a preset angle, the lever contacts the stopper to make the grating assembly rotate relative to the turntable, thereby realizing the switching of the grating body. At this time, the center line of the grating body coincides with the rotation axis of the turntable. When the turntable drives the grating assembly to rotate at an angle less than the preset angle, the grating body rotates around the rotation axis of the turntable to collect the spectrum. Through the above design, when collecting the spectrum, the center line of the grating body coincides with the rotation axis of the turntable, and the grating body rotates around the rotation axis of the turntable. The grating body only rotates without deflection, so that the grating body covers a large spectrum range. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a stereogram of the multi-grating spectrometer of the present invention;

[0017] Figure 2 for Figure 1 A stereogram of the multi-grating spectrometer from another perspective;

[0018] Figure 3 for Figure 2 A perspective view of the grating assembly of a multi-grating spectrometer;

[0019] Figure 4 for Figure 3 A three-dimensional diagram of the internal structure of the grating assembly;

[0020] Figure 5 for Figure 1 A stereoscopic diagram of the local structure of a multi-grating spectrometer.

[0021] In the figure: 10, base; 20, driving structure; 30, turntable; 40, stopper; 50, grating assembly; 51, bearing; 510, limit groove; 52, mounting frame; 520, first frame; 5201, extension portion; 5202, lever; 521, rotating shaft; 522, second frame; 53, grating body; 60, limit assembly; 61, slide rail; 62, elastic member; 63, limit member; 630, cam; 631, contact plate. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0023] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be another intermediate component through which it is fixed. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] See also Figure 1 as well as Figure 2 The multi-grating spectrometer includes a base 10, a driving structure 20, a turntable 30, a stopper 40, a grating assembly 50 and a limiting assembly 60.

[0026] The base 10 is used to install the driving structure 20 , the turntable 30 and the stopper 40 .

[0027] The driving structure 20 is fixedly installed inside the base 10, and the driving structure 20 is transmission-connected with the turntable 30, driving the turntable 30 to rotate relative to the base 10. Specifically, the driving structure 20 is a worm gear structure.

[0028] The turntable 30 is used to drive the grating assembly 50 to rotate, so as to realize spectrum collection and switching of the grating body 53 .

[0029] The stopper 40 is fixed to the base 10 . When the grating assembly 50 rotates to a preset angle, the stopper 40 contacts the grating assembly 50 , so that the grating assembly 50 rotates relative to the turntable 30 , thereby realizing the switching of the grating body 53 .

[0030] Please continue reading Figure 3 as well as Figure 4The grating assembly 50 is rotatably mounted on the turntable 30, and the rotation axis of the grating assembly 50 relative to the turntable 30 does not coincide with the rotation axis of the turntable 30 relative to the base 10. The grating assembly 50 includes a bearing 51, a mounting frame 52, and a plurality of grating bodies 53. The bearing 51 is connected to the mounting frame 52, and the bearing 51 rotates with the mounting frame 52, and the plurality of grating bodies 53 are mounted on the mounting frame 52.

[0031] The bearing 51 is provided with a plurality of limiting grooves 510, and the number of the limiting grooves 510 is the same as the number of the grating body 53. The limiting grooves 510 are buckled with the limiting assembly 60, so that the switched grating body 53 is limited to prevent the grating body 53 from rotating relative to the turntable 30 without the action of external force. Specifically, the bearing 51 is circular as a whole, and the plurality of limiting grooves 510 are provided on the outer edge of the bearing 51, and the limiting grooves 510 are V-shaped.

[0032] The mounting frame 52 includes a first frame 520, a rotating shaft 521 and a second frame 522. The first frame 520 is fixed to the bottom of the rotating shaft 521, and the second frame 522 is fixed to the top of the rotating shaft 521. The first frame 520 is provided with a plurality of extensions 5201 and a plurality of levers 5202. Each extension 5201 extends horizontally, and each lever 5202 extends from the end of the extension 5201 and is perpendicular to the extension 5201. The number of levers 5202 is equal to the number of grating bodies 53. The levers 5202 are used to contact with the stopper 40 when the grating assembly 50 rotates to a preset angle, so as to push the grating assembly 50 to rotate relative to the turntable 30 to realize the switching of the grating body 53. Specifically, in the present embodiment, the first frame 520 and the second frame 522 are both equilateral triangles.

[0033] The grating bodies 53 are installed between the first frame 520 and the second frame 522. The grating bodies 53 are evenly distributed, and the midlines of the grating bodies 53 are located on a circle with the rotating shaft 521 as the center. In this embodiment, the number of grating bodies 53 is 3. When the grating bodies 53 are switched, the grating assembly 50 rotates 120° relative to the turntable 30.

[0034] Please continue reading Figure 5 The limiting assembly 60 includes a slide rail 61, an elastic member 62 and a limiting member 63. The slide rail 61 is fixed to the turntable 30. The limiting member 63 is slidably installed on the slide rail 61. The two ends of the elastic member 62 are respectively in contact with the slide rail 61 and the limiting member 63. In this embodiment, the elastic member 62 is a spring. The limiting member 63 includes a cam 630 and a contact plate 631 fixedly connected to the cam 630. The elastic member 62 is in contact with the contact plate 631. Under the elastic force of the elastic member 62, the cam 630 extends into the limiting groove 510 of the bearing 51, so that the switched grating body 53 is circumferentially limited relative to the turntable 30 without being affected by external forces.

[0035] When the multi-grating spectrometer is used, the driving structure 20 drives the turntable 30 to rotate relative to the base 10. At this time, the grating assembly 50 and the limit assembly 60 rotate together with the turntable 30, and the grating assembly 50 remains stationary relative to the turntable 30. When the turntable 30 rotates to a preset angle, the lever 5202 of the grating assembly 50 contacts the stopper 40. Since the stopper 40 is fixed to the base 10, the force applied to the lever 5202 drives the grating assembly 50 to rotate relative to the turntable 30 around the rotation axis 521. At this time, the movement of the grating assembly 50 includes both the rotation of the turntable 30 around the axis of the turntable 30 and the self-rotation of the grating assembly 50 around the rotation axis 521. When the grating assembly 50 starts to rotate around the rotating shaft 521, the limiting member 63 is resisted by the edge of the limiting groove 510 of the bearing 51, and the limiting member 63 retracts, and the limiting member 63 resists the circumference of the bearing 51 until the grating body 53 is switched to a position, at which time the limiting member 63 extends into the next limiting groove 510, so that the grating body 53 switched to a position is locked relative to the turntable 30, and at this time the lever 5202 also passes over the stopper 40. The center line of the grating body 53 switched to a position coincides with the axis of the turntable 30. Then the driving structure 20 continues to drive the turntable 30 to rotate. When the rotation angle is less than the preset value, the lever 5202 will not contact the stopper 40. At this time, the grating body 53 rotates with the turntable 30 to collect the spectrum. The grating body 53 only rotates without deflection, so that the grating body 53 covers a large spectrum range.

[0036] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of them belong to the protection scope of the present invention.

Claims

1. A multi-grating spectrometer, comprising a base, a driving structure and a turntable drivingly connected to the driving structure, wherein the driving structure drives the turntable to rotate relative to the base, characterized in that: The multi-grating spectrometer also includes a block, a grating assembly and a limit assembly, wherein the block is fixedly mounted on the base, the grating assembly is rotatably mounted on the turntable, the rotation axis of the grating assembly does not coincide with the rotation axis of the turntable, the limit assembly is mounted on the turntable, the grating assembly includes a mounting frame and a plurality of grating bodies located on the mounting frame, the mounting frame includes a lever, the driving structure drives the turntable, the grating assembly and the limit assembly to rotate relative to the base, and during the process of the turntable driving the grating assembly to rotate, when the turntable rotates to a preset angle, the lever conflicts with the block to cause the grating assembly to rotate relative to the turntable, thereby realizing the switching of the grating body, after which the center line of the grating body coincides with the rotation axis of the turntable, and when the turntable drives the grating assembly to rotate at an angle less than the preset angle, the grating body rotates around the rotation axis of the turntable to collect spectra.

2. The multi-grating spectrometer according to claim 1, characterized in that: The grating assembly also includes a bearing, which is connected to the mounting frame and rotates with the mounting frame. The bearing is provided with a plurality of limit grooves. The limit assembly is buckled with any of the limit grooves to position the switched grating body relative to the turntable.

3. The multi-grating spectrometer according to claim 2, characterized in that: The limiting assembly includes a slide rail, an elastic member and a limiting member, the slide rail is fixed to the turntable, the limiting member is slidably installed on the slide rail, two ends of the elastic member respectively contact the slide rail and the limiting member, and the elastic force of the elastic member causes the limiting member to extend into the limiting groove.

4. The multi-grating spectrometer according to claim 2, characterized in that: The limiting groove is V-shaped.

5. The multi-grating spectrometer according to claim 1, characterized in that: The mounting frame includes a first frame, a rotating shaft and a second frame, the first frame is fixed to the bottom end of the rotating shaft, the second frame is fixed to the top end of the rotating shaft, the shift rod is arranged on the first frame, and the grating body is installed between the first frame and the second frame.

6. The multi-grating spectrometer according to claim 5, characterized in that: The plurality of grating bodies are evenly distributed on the mounting frame, and the center lines of the plurality of grating bodies are located on a circumference.

7. The multi-grating spectrometer according to claim 6, characterized in that: The first frame and the second frame are both equilateral triangles.

8. The multi-grating spectrometer according to claim 5, characterized in that: The first frame further includes an extension portion, which is horizontally arranged. The lever extends from a distal end of the extension portion and is perpendicular to the extension portion.

9. The multi-grating spectrometer according to claim 8, characterized in that: The number of the levers is equal to the number of the grating bodies, and the angle between two adjacent levers and the rotating shaft is greater than the rotation angle of the grating body when collecting the spectrum.

10. The multi-grating spectrometer according to claim 1, characterized in that: The driving structure is a worm gear.

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