Spectrometer

Abstract

The utility model discloses a spectrometer, which relates to the field of optical teaching aids and comprises a base assembly and a rotating seat assembly which can rotate relatively. A dial and an alidade are arranged between the base assembly and the rotating seat assembly; the dial and the alidade are respectively in one-to-one correspondence with the base assembly and the rotating seat assembly and are fixed; the dial is provided with a first scale bar, and the first scale bar is arranged around the rotating center between the base assembly and the rotating seat assembly; a second scale bar is arranged on the alidade; the plurality of scale marks of the second scale bar can be overlapped with the plurality of scale marks of the first scale bar to form a plurality of corresponding overlapping areas; and the overlapping areas of the plurality of overlapping regions are different. According to the spectrometer, a user can read conveniently, the situation that the attention of the user is distracted is reduced, the user is helped to read rapidly, and the reading time is saved.

Description

Technical Field

[0001] The utility model relates to the field of optical teaching aids, in particular to a spectrometer. Background Art

[0002] The spectrometer is an indispensable precision instrument in optical experiments. It consists of a base, a swivel, a collimator and a telescope. Among these components, a stage for placing samples is installed on the base. The swivel is mounted on the base and can rotate around the stage. The collimator is firmly attached to the base through a bracket, while the telescope is mounted in another bracket on the swivel and can rotate synchronously with the swivel. This design allows the collimator and telescope to be arranged around the stage for easy optical measurement.

[0003] In order to achieve accurate measurement and reading of angular rotation, the spectrometer is equipped with a scale and a vernier between the base and the swivel. The scale and the vernier are arranged on the same horizontal plane, and the reading is performed by aligning the scale lines of the two. However, this process often requires the user to compare the scale lines one by one to find the best alignment line. Since the scale lines are usually small, this not only increases the difficulty of accurate reading, but also requires continuous comparison. Even if the position of the most aligned scale line is initially confirmed, all subsequent scale lines must be checked and finally returned to the initial position for reconfirmation, which prolongs the reading time and distracts the user's attention.

[0004] Therefore, it is necessary to develop a spectrometer that can facilitate users to read the data, reduce the situation of distracting users' attention, and help users to read the data quickly. Utility Model Content

[0005] The utility model aims to solve one of the technical problems in the related art to a certain extent. To this end, the utility model provides a spectrometer that can facilitate the user to read, reduce the situation of distracting the user's attention, help the user to read quickly, and save reading time.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a spectrometer, comprising a base assembly and a rotating seat assembly that can rotate relatively; a scale plate and a vernier plate are arranged between the base assembly and the rotating seat assembly; the scale plate and the vernier plate correspond to and are fixed to the base assembly and the rotating seat assembly respectively;

[0007] The scale plate is provided with a first scale bar, and the first scale bar is arranged around the rotation center between the base assembly and the rotating seat assembly; the cursor plate is provided with a second scale bar; it is characterized in that:

[0008] The multiple scale lines of the second scale bar can overlap with the multiple scale lines of the first scale bar to form a corresponding multiple overlapping areas, and the areas of the overlapping areas are different from each other.

[0009] This solution sets translucent (reflective) scale lines and forms multiple overlapping areas so that the overlapping area formed by the most aligned pair of scale lines has the largest area. On the one hand, because the scale lines are translucent (reflective), when light shines on the overlapping area and passes through the scale lines, the user can clearly observe. On the other hand, a larger overlapping area means more light passes through, resulting in higher brightness. The user can quickly and accurately locate the most aligned scale line by finding the brightest overlapping area to achieve reading. Compared with traditional methods, it reduces the possibility of distracting the user's attention, and there is no need to compare all scale lines in detail, which effectively saves reading time.

[0010] Optionally, the setting surface of the second scale bar is opposite to the setting surface of the first scale bar; at least one of the scale lines on the scale plate and the vernier plate is light-transmissive, so that each overlapping area can be observed through the corresponding scale line.

[0011] Optionally, the scale plate and the cursor plate both include transparent media;

[0012] The scale plate has a first surface and a second surface opposite to each other, the cursor plate has a third surface and a fourth surface opposite to each other, and the second surface and the third surface are opposite to each other; the first scale bar is arranged on the second surface, and the second scale bar is arranged on the third surface.

[0013] Optionally, the scale dial further includes a first side surface located between the first surface and the second surface, the first side surface being respectively connected to the first surface and the second surface; the cursor dial further includes a third side surface located between the third surface and the fourth surface, the third side surface being respectively connected to the third surface and the fourth surface; the spectrometer further includes a light source assembly arranged on the first side surface or the third side surface.

[0014] Optionally, the spectrometer further comprises a light source assembly arranged on one side of the first surface, and the first surface, the second surface, the third surface and the fourth surface are arranged in sequence on the optical path of the light source assembly;

[0015] The light transmittance of the cursor in the scale line area is greater than the light transmittance of the area outside the scale lines, and / or the light transmittance of the cursor in the scale line area is greater than the light transmittance of the area outside the scale lines.

[0016] Optionally, the light source assembly and the cursor disk are relatively fixed and can rotate synchronously.

[0017] Optionally, it also includes a shell for forming a darkroom and an observation port opened on the shell; the light source assembly, the dial and the vernier disk are arranged in the shell, the observation port is opposite to the second scale bar and the observation port can move synchronously with the second scale bar.

[0018] Optionally, a distance between a setting surface of the second scale bar and a setting surface of the first scale bar is less than or equal to 5 mm.

[0019] Optionally, the setting surface of the first scale bar is parallel to the setting surface of the second scale bar.

[0020] Optionally, the vertical distance from the second scale bar to the rotation center is equal to the vertical distance from the first scale bar to the rotation center.

[0021] These features and advantages of the utility model will be disclosed in detail in the following specific embodiments and drawings. The best implementation or means of the utility model will be fully presented in conjunction with the drawings, but it is not a limitation of the technical solution of the utility model. In addition, these features, elements and components appearing in each of the following texts and drawings are multiple, and are marked with different symbols or numbers for convenience, but all represent components with the same or similar structure or function. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described below in conjunction with the accompanying drawings:

[0023] Figure 1 FIG. 4 is a cross-sectional view of the spectrometer along the radial direction of the main axis in some embodiments.

[0024] Figure 2 Schematic diagram of the structure of the spectrometer in some embodiments.

[0025] Figure 3 Schematic diagram of the structure of the scale plate and the vernier plate on the base assembly in some embodiments.

[0026] Figure 4a , Figure 4b , Figure 4c , Figure 4d and Figure 4e Different settings of the scale plate and the vernier plate are shown respectively.

[0027] Figure 5a , Figure 5b and Figure 5c They are schematic diagrams of the structures of the first scale bar, the second scale bar and the overlapping area.

[0028] Among them, 100, base assembly; 200, swivel assembly; 300, dial; 310, first surface; 320, second surface; 330, first side; 340, first scale bar; 400, vernier disk; 410, third surface; 420, fourth surface; 430, third side; 440, second scale bar; 500, overlapping area; 600, housing; 610, observation port; 700, light source assembly. DETAILED DESCRIPTION

[0029] The following is a detailed description of embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments in the implementation manner are intended to be used to explain the present invention and should not be construed as limiting the present invention.

[0030] References to "one embodiment" or "an example" or "an example" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment disclosed in the present utility model. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0031] Example:

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, a spectrometer is shown, including a base assembly 100 and a swivel assembly 200 that can rotate relative to each other, as well as a collimator assembly, a telescope assembly, and a stage assembly. The swivel assembly 200 is mounted on the base assembly 100 and can rotate around the stage assembly. The collimator assembly is firmly attached to the base assembly 100 through a bracket, and the telescope assembly is mounted in another bracket on the swivel assembly 200 and can rotate synchronously with the swivel assembly 200. Such a design allows the collimator assembly and the telescope assembly to be arranged around the stage assembly to facilitate optical measurement.

[0033] A scale plate 300 and a vernier plate 400 are provided between the base assembly 100 and the swivel assembly 200. The scale plate 300 and the vernier plate 400 correspond to and are fixed to the base assembly 100 and the swivel assembly 200, respectively, that is, there are two connection modes, one is that the scale plate 300 is fixed to the base assembly 100, and the vernier plate 400 is fixed to the swivel assembly 200, and the other is that the scale plate 300 is fixed to the swivel assembly 200, and the vernier plate 400 is fixed to the base assembly 100. The technicians in this field can flexibly select which one to choose according to the situation, and there is no limitation here. In this embodiment, only the first connection mode is taken as an example for description.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, the base assembly 100 includes a base and a spindle. The base is used to be placed on any flat surface, such as the ground or a table, to provide a stable support for the entire device. The spindle is a component vertically standing on the base, and its lower end is fixedly connected to the base. A center hole is designed at the upper end of the spindle for positioning and rotating the stage assembly.

[0035] The stage assembly consists of a stage, a vertical shaft arranged below it, and a locking assembly mounted on the vertical shaft. The vertical shaft is inserted into the center hole of the spindle, and the degree of connection between the vertical shaft and the spindle is adjusted by the locking assembly. When the locking assembly is in the loose state, the stage can rotate freely around the center hole; when the locking assembly is in the locked state, the position of the stage and the spindle is relatively fixed. In order to achieve precise positioning, the stage is designed to be circular, and the adjustment assembly can be used to ensure that its center is concentric with the spindle.

[0036] like Figure 4a and Figure 4b As shown, the scale plate 300 and the cursor plate 400 are both annular structures, with a circular hole in the center so as to be sleeved outside the main shaft. The scale plate 300 is located directly below the cursor plate 400, and the inner diameter and outer diameter of the two are consistent. The scale plate 300 is fixed to the base assembly 100, and the main shaft passes through the turntable assembly 200, so that the turntable assembly 200 can rotate on the main shaft. The cursor plate 400 is fixed to the turntable assembly 200 and can rotate synchronously around the stage with the turntable assembly 200 and the telescope assembly connected to the turntable assembly 200.

[0037] On the one hand, the scale plate 300 has a first scale bar 340 (see Figure 5a and Figure 5c ), the first scale bar 340 surrounds the rotation center between the base assembly 100 and the swivel assembly 200. The first scale bar 340 is arranged on the rotation plane and covers a range of 360° with the rotation center as the base point. Specifically, the first scale bar 340 is composed of 720 scale lines, which means that there are two corresponding scale lines for every degree. The intervals between these scale lines are consistent, and the width of each scale line is also the same to ensure visual consistency and measurement accuracy.

[0038] On the other hand, Figure 3 and Figure 5bAs shown, the second scale bar 440 is provided on the cursor plate 400, and its extension direction coincides with the path of the first scale bar 340, that is, the distance from the second scale bar 440 to the rotation center is the same as the distance from the first scale bar 340 to the rotation center. The second scale bar 440 is also composed of a plurality of scale lines, and these scale lines are arranged equidistantly in the extension direction of the second scale bar 440. It is worth noting that although the scale line width of the second scale bar 440 is consistent with the scale line width of the first scale bar 340, the scale line interval of the second scale bar 440 is smaller than the scale line interval of the first scale bar 340. In addition, the length of the second scale bar 440 is also shorter, which is only equivalent to a section of the first scale bar 340.

[0039] Specifically, if the first scale bar 340 is understood as a complete circle, the second scale bar 440 corresponds to a segment of arc on the circle. On this segment of arc, the first scale bar 340 includes one more scale line than the second scale bar 440. This design enables the second scale bar 440 to read the relative position with the first scale bar 340 with finer resolution when aligned, thereby providing a more accurate angle measurement result.

[0040] like Figure 5a , Figure 5b and Figure 5c As shown, a section of the first scale bar 340 unfolded on a plane and the corresponding second scale bar 440 are shown. The solid line is the first scale bar 340, and the dotted line is the second scale bar 440. As can be seen from the figure, the spacing between the scale lines in the first scale bar 340 is greater than the spacing between the scale lines in the second scale bar 440, and the length (radian) corresponding to the 9 scale lines in the first scale bar 340 is equal to the length (radian) corresponding to the 10 scale lines in the second scale bar 440.

[0041] On the path of light passing through the scale plate 300 and the vernier plate 400, the multiple scale lines of the second scale bar 440 can overlap with the multiple scale lines of the first scale bar 340 and form corresponding multiple overlapping areas 500, and the overlapping areas of the multiple overlapping areas 500 are different. By setting the translucent (reflective) scale lines and forming multiple overlapping areas 500, the overlapping area 500 formed by the most aligned pair of scale lines has the largest area. On the one hand, since the scale lines are translucent (reflective), when the light shines on the overlapping area 500 and passes through the scale lines, the user can clearly observe it. On the other hand, a larger overlapping area 500 means that more light passes through, so the brightness is higher. The user can quickly and accurately locate the most aligned scale line by finding the brightest overlapping area 500 to achieve reading. Compared with the traditional method, this method reduces the requirements for user attention, does not need to compare all scale lines in detail, and effectively saves reading time.

[0042] Further, the second scale bar 440 is disposed on a surface opposite to the first scale bar 340. At least one of the scale lines on the scale plate 300 and the vernier plate 400 is light-transmissive, so that the plurality of overlapping areas 500 can be observed through the corresponding scale line.

[0043] The differences in materials and structures between the scale plate 300 and the vernier plate 400 result in significant differences in the propagation paths and modes of light passing through the first scale bar 340 and the second scale bar 440. These differences may be reflected in optical phenomena such as transmission and reflection. Figure 4a , Figure 4b , Figure 4c , Figure 4d and Figure 4e Examples are given to illustrate these differences.

[0044] In some embodiments, the vernier disc 400 and the scale disc 300 are arranged in order from top to bottom along the axis of the main shaft, and the two are arranged in parallel. The opposite surfaces of the vernier disc 400 and the scale disc 300 respectively carry the second scale bar 440 and the first scale bar 340. For the convenience of observation, the spacing between the bearing surface of the second scale bar 440 and the bearing surface of the first scale bar 340 is set to not more than 5mm. This close arrangement ensures that when the two scale bars form an overlapping area 500, the scale lines in the first scale bar 340 allow more light to pass through and correspond to the scale lines in the second scale bar 440.

[0045] The scale lines of the first scale bar 340 can emit light or allow external light to pass under certain conditions, so that when overlapping with the scale lines of the second scale bar 440, they can be observed through the overlapping area 500 of the second scale bar 440. For example, the scale lines of the first scale bar 340 are made of photoluminescent materials, which can emit light under light or specific excitation; the scale lines of the first scale bar 340 are made of electroluminescent materials, which can produce a luminous effect under the action of an electric field; the scale lines of the first scale bar 340 can also be hollow parts on the dial 300, which penetrate the two surfaces of the dial 300 and allow light from an external light source to pass directly to the second scale bar 440; or, if the dial 300 is made of a transparent material, a light-proof film is attached to the two side surfaces, and hollow parts are dug out on the film corresponding to the scale line positions of the first scale bar 340, so as to achieve a similar light-transmitting effect.

[0046] The scale lines of the second scale bar 440 on the cursor plate 400 also adopt a hollow structure similar to the first scale bar 340. Such a design allows light in the overlapping area 500 to pass through when the first scale bar 340 and the second scale bar 440 form an overlapping area, thereby facilitating observation by the user.

[0047] like Figure 4a In some embodiments, the scale plate 300 includes a first surface 310 and a second surface 320 that are opposite to each other, and the cursor plate 400 includes a third surface 410 and a fourth surface 420 that are opposite to each other, and the second surface 320 and the third surface 410 are opposite to each other. The first surface 310, the second surface 320, the third surface 410 and the fourth surface 420 are parallel to each other to facilitate the transmission of light and the observation of the scale lines. Specifically, the first scale bar 340 is disposed on the second surface 320 of the scale plate 300, and the second scale bar 440 is disposed on the third surface 410 of the cursor plate 400.

[0048] like Figure 4b In some embodiments, the cross-sectional shape of the dial 300 and the vernier plate 400 is a triangle, especially a right triangle, so that the first surface 310 and the fourth surface 420 of the dial 300 remain parallel, and the overall cross-sectional shape is a parallelogram. This structural design helps to stabilize the assembly and ensure that light can pass through the scale bar smoothly. The arrows in the figure show the transmission path of light through the first scale bar 340 and the second scale bar 440.

[0049] Similarly, in this embodiment, the scale plate 300 and the vernier plate 400 are both transparent media, and the scale lines of the first scale bar 340 and the scale lines of the second scale bar 440 are both hollow structures. The scale plate 300 and the vernier plate 400 are both made of transparent media, and the first scale bar 340 and the second scale bar 440 thereon are both hollow structures. This design ensures that even if there is a certain angle between the first surface 310 and the second surface 320, the light will not be refracted or reflected when passing through the overlapping area 500 of the first scale bar 340 and the second scale bar 440, thereby not interfering with the accuracy of the reading.

[0050] In addition, the spectrometer also includes a light source assembly 700 disposed on one side of the first surface 310. The first surface 310, the second surface 320, the third surface 410 and the fourth surface 420 are arranged in sequence on the light path of the light source assembly 700. Since the first scale bar 340 and the second scale bar 440 adopt a hollow structure consistent with the light transmission direction, the light emitted by the light source assembly 700 can pass through these structures in large quantities. When reading, the user can directly observe the light source assembly 700 through the overlapping area 500 of the two. In order to optimize the observation effect, the light source assembly 700 can use a surface light source or use a point light source with a soft light plate to achieve more uniform light passing through the second scale bar 440.

[0051] It should be noted that the light transmittance of the scale area of ​​the cursor plate 400 is better than that of the non-scale area. Similarly, the light transmittance of the scale area of ​​the dial 300 is also better than that of the non-scale area. Such a design can reduce the light leakage phenomenon in the non-overlapping area 500, ensure that the brightness of the overlapping area 500 is sufficient when reading, thereby improving the clarity and accuracy of the reading.

[0052] In the design of a spectrometer, the configuration of the light source assembly 700 is crucial to improving the visibility and accuracy of the scale reading. According to different embodiments, the light source assembly 700 can be configured in a variety of ways to meet observation requirements.

[0053] In some embodiments, the light source assembly 700 is designed to be arranged around the main shaft, that is, arranged within a 360-degree range around the main shaft, and illuminates the scale plate 300 upward. This configuration allows the light source assembly 700 to be fixed to the main shaft, so it does not need to rotate synchronously with the cursor plate 400. Such a design simplifies the structure of the light source assembly 700 and ensures comprehensive and uniform illumination of the scale plate 300.

[0054] As an alternative, the light source assembly 700 can be fixed relative to the cursor plate 400 through a connecting piece and can rotate synchronously therewith. This structure can reduce the required irradiation range because the light source only needs to cover the second scale bar 440 on the cursor plate 400, without irradiating in all directions. This helps to concentrate the light and improve the observation clarity of the second scale bar 440, and reduce the power consumption of the light source assembly 700.

[0055] In addition to illuminating the transparent hollow portion directly from the first surface 310, the light source assembly 700 in other embodiments can also be disposed on the first side surface 330 of the dial 300, which is located between the first surface 310 and the second surface 320. Similarly, the cursor plate 400 also has a corresponding third side surface 430.

[0056] In these embodiments, the dial 300 and the cursor plate 400 adopt the same shape as the above embodiments, for example, the cross section is a rectangle or a right triangle. The light from the light source assembly 700 enters the dial 300 through the first side surface 330, and then irradiates the diffuse reflection area of ​​the first scale bar 340 by total reflection or directly. These diffuse reflection areas are formed on the surface of the transparent medium by laser, chemical or physical treatment processes, similar to a frosted surface. When the first scale bar 340 overlaps with the second scale bar 440, since there is an angle of less than 30 degrees between the two, the light in the diffuse reflection area can be observed through the hollow part of the second scale bar 440.

[0057] In order to further improve the light utilization efficiency, a mirror surface can be added to the first surface 310 and the second surface 320, facing the inside of the scale plate 300, so as to reflect the light to the diffuse reflection area. Such a design can enhance the light intensity seen by the observer and improve the visibility of the scale reading.

[0058] It is worth noting that in the above embodiment, the observation process begins with the light passing through the first scale bar 340 and then the second scale bar 440. However, in other alternative embodiments, the order of the scale plate 300 and the cursor plate 400 can be interchanged, so that the light first passes through the second scale bar 440 and then the first scale bar 340. Accordingly, the light source assembly 700 will be disposed on the third side 430 of the cursor plate 400.

[0059] In the embodiment where the vernier plate 400 is sleeved outside the scale plate 300, the diameter of the third surface 410 of the vernier plate 400 is greater than the diameter of the second surface 320 of the scale plate 300. According to different design requirements, the cross-sectional shapes of the vernier plate 400 and the scale plate 300 can be various forms such as rectangle or triangle to adapt to different measurement scenarios. Those skilled in the art can flexibly select according to the situation, and no limitation is made here.

[0060] In addition, there is an embodiment showing that the cursor plate 400 is sleeved outside the scale plate 300, wherein the third surface 410 of the cursor plate 400 has a certain inclination angle relative to the second surface 320 of the scale plate 300. In this design, the first scale bar 340 on the scale plate 300 adopts a hollow structure along the radial direction of the scale plate 300, and the third surface 410 of the cursor plate 400 is painted black in the area other than the second scale bar 440, and only the scale lines of the second scale bar 440 as part of the mirror surface are exposed. When light passes through the hollow part of the first scale bar 340 and reaches the third surface 410, it will be reflected outward by the mirror scale lines of the second scale bar 440, so that the observer can clearly observe the light.

[0061] In general, the design of the spectrometer takes into account different configurations of the light source assembly 700, as well as the structural features of the dial 300 and the vernier plate 400, in order to provide accurate and reliable readings and operational flexibility.

[0062] In order to improve the accuracy of observing the brightness of the overlap region 500 and reduce the interference of ambient light, some embodiments include a housing 600 forming a darkroom and an observation port 610 provided on the housing 600. The housing 600 provides a closed space for the internal components, thereby reducing the influence of external light on the measurement results.

[0063] In this configuration, the light source assembly 700, the scale plate 300 and the cursor plate 400 are all disposed inside the housing 600. The position of the observation port 610 corresponds to the second scale bar 440 and can move synchronously with the movement of the second scale bar 440. Such a design enables the observer to directly observe the overlapping area 500 of the second scale bar 440 and the first scale bar 340 through the observation port 610 without being disturbed by the external environment.

[0064] The structure of the housing 600 includes an annular upper housing and a corresponding lower housing. The lower housing is fixed to the main shaft and remains stationary, while the upper housing can rotate synchronously with the cursor plate 400. This structure allows the upper housing to rotate together with the observation port 610, ensuring that the observation port 610 always keeps the same position with the second scale bar 440.

[0065] To further enhance the observation effect, the observation port 610 may be equipped with an optical element, such as a lens or a magnifying glass, to magnify the image of the observation area, thereby improving the accuracy of the reading. In addition, the design of the observation port 610 also takes into account the prevention of stray light from entering, and may include features such as a light shielding groove or a diaphragm to ensure that the observer only sees the light from the light source assembly 700 via the first scale bar 340 and the second scale bar 440.

[0066] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention shall be included in the scope of the claims.

Claims

1. A spectrometer, comprising a base assembly and a rotating seat assembly capable of relative rotation; a scale plate and a vernier plate are arranged between the base assembly and the rotating seat assembly; the scale plate and the vernier plate correspond to and are fixed to the base assembly and the rotating seat assembly respectively; The scale plate is provided with a first scale bar, and the first scale bar is arranged around the rotation center between the base assembly and the rotating seat assembly; the cursor plate is provided with a second scale bar; it is characterized in that: The multiple scale lines of the second scale bar can overlap with the multiple scale lines of the first scale bar to form a corresponding multiple overlapping areas, and the areas of the overlapping areas are different from each other.

2. The spectrometer according to claim 1, characterized in that The setting surface of the second scale bar is opposite to the setting surface of the first scale bar; at least one of the scale lines on the scale plate and the vernier plate is light-transmissive, so that each overlapping area can be observed through the corresponding scale line.

3. The spectrometer according to claim 2, characterized in that The scale plate and the vernier plate both include a transparent medium; The scale plate has a first surface and a second surface opposite to each other, the cursor plate has a third surface and a fourth surface opposite to each other, and the second surface and the third surface are opposite to each other; the first scale bar is arranged on the second surface, and the second scale bar is arranged on the third surface.

4. The spectrometer according to claim 3, characterized in that The scale dial also includes a first side surface located between the first surface and the second surface, and the first side surface is respectively connected to the first surface and the second surface; the cursor dial also includes a third side surface located between the third surface and the fourth surface, and the third side surface is respectively connected to the third surface and the fourth surface; the spectrometer also includes a light source assembly arranged on the first side surface or the third side surface.

5. The spectrometer according to claim 3, characterized in that The spectrometer further comprises a light source assembly arranged on one side of the first surface, and the first surface, the second surface, the third surface and the fourth surface are arranged in sequence on the optical path of the light source assembly; The light transmittance of the cursor in the scale line area is greater than the light transmittance of the area outside the scale lines, and / or the light transmittance of the cursor in the scale line area is greater than the light transmittance of the area outside the scale lines.

6. The spectrometer according to claim 4 or 5, characterized in that The light source assembly and the cursor disk are relatively fixed and can rotate synchronously.

7. The spectrometer according to claim 6, characterized in that It also includes a shell for forming a darkroom and an observation port opened on the shell; the light source assembly, the dial and the vernier disk are arranged in the shell, the observation port is opposite to the second scale bar and the observation port can move synchronously with the second scale bar.

8. The spectrometer according to claim 2, characterized in that The distance between the setting surface of the second scale bar and the setting surface of the first scale bar is less than or equal to 5 mm.

9. The spectrometer according to claim 2, characterized in that The setting surface of the first scale bar is parallel to the setting surface of the second scale bar.

10. The spectrometer according to claim 2, characterized in that The vertical distance from the second scale bar to the rotation center is equal to the vertical distance from the first scale bar to the rotation center.

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