Optical device for detection

Abstract

The utility model discloses an optical device for detection, and the device comprises a first prism which comprises a first light incident surface and a first light emergent surface, and light enters the first prism from the first light incident surface and is emitted out of the first prism from the first light emergent surface; the second prism comprises a second light incident surface and a second light emergent surface, and the light emitted from the first light emergent surface enters the second prism from the second light incident surface and is emitted from the second light emergent surface to be emitted to an object to be detected; wherein the first light-emitting surface and the second light-emitting surface are oppositely and parallelly arranged, the connecting line of the center of the first light-emitting surface and the center of the second light-emitting surface is perpendicular to the first light-emitting surface, and the first prism can rotate clockwise or anticlockwise around a rotating shaft by taking the connecting line of the center of the first light-emitting surface and the center of the second light-emitting surface as the rotating shaft. According to the optical device of the utility model, the optical device can adapt to detection of multiple angles, and the universality and flexibility of the optical device during detection are improved.

Description

Technical Field

[0001] This utility model relates to the field of optical instruments, and in particular to an optical device for detection. Background Technology

[0002] In the field of optical manufacturing and testing, standard angle blocks are frequently used to match a certain segment of the optical path with a specific angle. For example, when testing the transmittance of a coated glass substrate, different angle matching blocks need to be fabricated according to the setting of sampling points at the incident angle to measure the transmittance under different incident angles.

[0003] However, ordinary angle blocks are for a single angle, and a matching block is required for each sampling angle, which is costly and not very flexible. Utility Model Content

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides an optical device for detection, which can adapt to detection from multiple angles, thereby reducing the cost of the optical device and improving its versatility and flexibility in detection.

[0005] According to the present invention, an optical device for detection includes:

[0006] A first prism, comprising a first light-incident surface and a first light-outcrying surface, wherein light enters the first prism from the first light-incident surface and exits the first prism from the first light-outcrying surface;

[0007] The second prism includes a second light-incident surface and a second light-outcrystal surface. Light rays emitted from the first light-outcrystal surface enter the second prism from the second light-incident surface and exit from the second light-outcrystal surface to be directed toward the object to be detected.

[0008] The first light-emitting surface and the second light-incident surface are arranged opposite to each other and parallel to each other. The line connecting the center of the first light-emitting surface and the center of the second light-incident surface is perpendicular to the first light-emitting surface. The first prism can rotate clockwise or counterclockwise around the line connecting the center of the first light-emitting surface and the center of the second light-incident surface as the rotation axis.

[0009] In some embodiments, a first refractive index matching liquid is disposed between the first light-emitting surface and the second light-incident surface to expel the air between the first light-emitting surface and the second light-incident surface.

[0010] In some optional embodiments, the first prism and the second prism are isosceles right-angled triangular prisms with the same structure and refractive index.

[0011] In some optional embodiments, one isosceles surface of the first prism is the first light-incident surface, the bottom surface of the first prism is the first light-outceasing surface, the bottom surface of the second prism is the second light-incident surface, and one isosceles surface of the second prism is the second light-outceasing surface.

[0012] In some embodiments, the object to be tested is disposed at the second light-emitting surface, and a second refractive index matching liquid is disposed between the object to be tested and the second light-emitting surface to expel the air between the object to be tested and the second light-emitting surface.

[0013] In some embodiments, the first prism and the second prism are triangular prisms with different structures and different refractive indices.

[0014] In some embodiments, a connecting mechanism is further included, wherein the second prism is fixedly connected to the connecting mechanism, and the first prism is rotatably connected to the connecting mechanism so that the first prism can rotate clockwise or counterclockwise around the rotation axis.

[0015] In some embodiments, the first prism is provided with a reference line, and the second prism is provided with a scale, thereby displaying the angle of rotation of the first prism relative to the second prism.

[0016] In some embodiments, a light emitter and a light receiver are further included, wherein the light emitter is disposed opposite to the first light incident surface so that the emitted light rays enter the first light incident surface perpendicularly;

[0017] The light receiver is used to receive light emitted from the object to be detected for detection and analysis.

[0018] In some alternative embodiments, the light emitter is disposed on the first light incident surface.

[0019] According to the optical device of this invention, by setting a first prism and a second prism, and taking the line connecting the center of the first light-emitting surface and the center of the second light-incident surface as the rotation axis, the first prism can rotate clockwise or counterclockwise around the rotation axis. That is, the first prism can rotate clockwise or counterclockwise on the second prism, thereby adjusting the angle between the first light-incident surface and the second light-emitting surface, so that light rays incident perpendicular to the first light-incident surface can exit from the second light-emitting surface at different angles. When the object to be detected is placed on the second light-emitting surface, the angle at which the light rays emitted from the second light-emitting surface are incident on the object to be detected varies depending on the angle of rotation of the first prism relative to the second prism. This allows the optical device of this invention to adapt to detection at multiple angles, thereby reducing the cost of the optical device and improving its versatility and flexibility in detection.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an optical device for detection according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of an optical device for detection according to another embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of an optical device for detection according to another embodiment of the present invention.

[0024] Figure label:

[0025] 100: Optical device; 10: First prism; 11: First light-incident surface; 12: First light-outcrystal surface; 20: Second prism; 21: Second light-incident surface; 22: Second light-outcrystal surface; 30: Rotation axis. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0027] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0028] The following is for reference. Figures 1-3The present invention describes an optical device 100 for detection according to an embodiment of the present invention. The optical device 100 includes a first prism 10 and a second prism 20. Specifically, for example, the optical device 100 for detection can be an optical device 100 for detecting transmittance. When it is necessary to detect the transmittance of a coated glass substrate, it may be necessary to set the positional relationship between the light source and the glass substrate according to different light incident angles. Therefore, an optical device 100 is needed to match multiple different light incident angles.

[0029] Furthermore, the first prism 10 includes a first incident surface 11 and a first exiting surface 12. Light enters the first prism 10 from the first incident surface 11 and exits the first prism 10 from the first exiting surface 12. It should be noted that during the transmission of light in the first prism 10, it can also be reflected by other surfaces of the first prism 10 and finally strike the first exiting surface 12 to exit from the first prism 10. Of course, during the transmission of light in the first prism 10, it can also directly strike the first exiting surface 12 from the first incident surface 11 and then exit from the first prism 10. The first prism 10 can be a triangular prism, a quadrangular prism, or other multi-prisms, and this embodiment of the present invention does not limit this.

[0030] Furthermore, the second prism 20 includes a second incident surface 21 and a second exiting surface 22. Light rays emitted from the first exiting surface 12 enter the second prism 20 through the second incident surface 21 and exit through the second exiting surface 22 to direct towards the object to be detected. It is understood that the specifications of the second prism 20 are basically the same as those of the first prism 10, and will not be described in detail here. The first prism 10 and the second prism 20 may be the same or different; this embodiment of the present invention does not impose any limitations on this.

[0031] Furthermore, the first light-emitting surface 12 and the second light-incident surface 21 are arranged opposite to each other and parallel to each other, and the line connecting the center of the first light-emitting surface 12 and the center of the second light-incident surface 21 is perpendicular to the first light-emitting surface 12. The first prism 10 can rotate clockwise or counterclockwise around the line connecting the center of the first light-emitting surface 12 and the center of the second light-incident surface 21 as the rotation axis 30.

[0032] It should be noted that the first light-emitting surface 12 and the second light-incident surface 21 are arranged opposite to each other and parallel to each other, so that the light emitted from the first light-emitting surface 12 can directly enter the second prism 20 from the second light-incident surface 21. Here, the center of the first light-emitting surface 12 and the center of the second light-incident surface 21 both refer to the geometric center. Specifically, for example, when the first light-emitting surface 12 and the second light-emitting surface 22 are rectangular surfaces, the first light-emitting surface 12 and the second light-emitting surface 22 refer to the intersection of the two diagonals of the rectangle. Therefore, when the line connecting the center of the first light-emitting surface 12 and the center of the second light-incident surface 21 is perpendicular to the first light-emitting surface 12, the line connecting the center of the first light-emitting surface 12 and the center of the second light-incident surface 21 is also perpendicular to the second light-incident surface 21. With the line connecting the center of the first light-emitting surface 12 and the center of the second light-incident surface 21 as the rotation axis 30, the first prism 10 can rotate clockwise or counterclockwise around the rotation axis 30. That is, the first prism 10 can rotate clockwise or counterclockwise on the second light-incident surface 21 of the second prism 20, thereby adjusting the angle between the first light-incident surface 11 and the second light-emitting surface 22, so that light rays incident perpendicular to the first light-incident surface 11 can be emitted from the second light-emitting surface 22 at different angles.

[0033] Understandably, the rotation axis 30 can be a rotating column that actually exists in the first prism 10 and the second prism 20. Specifically, for example, a rotating column connecting the first prism 10 and the second prism 20 can be provided on the line connecting the center of the first light-emitting surface 12 and the center of the second light-incident surface 21, wherein the second prism 20 is fixedly disposed with the rotating column, and the first prism 10 can rotate clockwise or counterclockwise around the rotating column. Of course, this embodiment of the present invention does not limit this. The rotation axis 30 may not be an actual existing structure. That is, the rotating column may not be provided between the first prism 10 and the second prism 20. The first prism 10 may be directly disposed on the second prism 20, or the first prism 10 and the second prism 20 may be connected by other mechanisms, as long as the first prism 10 can rotate clockwise or counterclockwise around the rotation axis 30.

[0034] The inventors discovered in their actual research that when performing optical detection, the standard angle block used to match a certain optical path with a certain angle is single. Usually, one sampling angle needs to correspond to a specific standard angle block, which is costly and not very flexible.

[0035] In view of this, the optical device 100 for detection according to the present invention, by setting a first prism 10 and a second prism 20, and taking the line connecting the center of the first light-emitting surface 12 and the center of the second light-incident surface 21 as the rotation axis 30, the first prism 10 can rotate clockwise or counterclockwise around the rotation axis 30. That is, the first prism 10 can rotate clockwise or counterclockwise on the second prism 20, thereby adjusting the angle between the first light-incident surface 11 and the second light-emitting surface 22, so that the light rays incident perpendicular to the first light-incident surface 11 can be emitted from the second light-emitting surface 22 at different angles. When the object to be detected is placed on the second light-emitting surface 22, the angle at which the light rays emitted from the second light-emitting surface 22 are incident on the object to be detected varies depending on the angle of rotation of the first prism 10 relative to the second prism 20. This allows the optical device 100 of the present invention to adapt to detection at multiple angles, thereby reducing the cost of the optical device 100 and improving the versatility and flexibility of the optical device 100 in detection.

[0036] Please continue to refer to Figures 1-3 In some embodiments, a first refractive index matching liquid is disposed between the first light-emitting surface 12 and the second light-incident surface 21 to expel the air between the first light-emitting surface 12 and the second light-incident surface 21.

[0037] It should be noted that the first light-emitting surface 12 and the second light-incident surface 21 are arranged opposite to and parallel to each other. There may be an air gap between the first light-emitting surface 12 and the second light-incident surface 21. When light enters the first prism 10 from the first light-incident surface 11 and is incident on the first light-emitting surface 12, the angle at which it is incident on the first light-emitting surface 12 may exceed the total internal reflection angle of the first prism 10. At this time, the light will undergo total internal reflection on the first light-emitting surface 12 and cannot be emitted from the first light-emitting surface 12. Therefore, by placing a first refractive index matching liquid between the first light-emitting surface 12 and the second light-incident surface 21, the air between the first light-emitting surface 12 and the second light-incident surface 21 is discharged, the total internal reflection condition of the first prism 10 is changed, so that the light will not undergo total internal reflection on the first light-emitting surface 12, so that it can be emitted from the first prism 10 and enter the second prism 20 through the second light-incident surface 21.

[0038] Understandably, the first prism 10 can be rotated first to a suitable angle before adding the first refractive index matching liquid between the first light-emitting surface 12 and the second light-incident surface 21. Of course, this embodiment of the present invention does not limit this; the first refractive index matching liquid can also be added between the first light-emitting surface 12 and the second light-incident surface 21 before rotating the first prism 10.

[0039] Please continue to refer to Figures 1-3In some optional embodiments, the first prism 10 and the second prism 20 are isosceles right-angled triangular prisms with the same structure and refractive index. It can be understood that setting the first prism 10 and the second prism 20 to the same specifications can simplify the manufacturing process of the optical device 100 and make the structure of the optical device 100 more regular.

[0040] Please continue to refer to Figures 1-3 In some optional embodiments, one isosceles surface of the first prism 10 is the first incident light surface 11, the bottom surface of the first prism 10 is the first emitting light surface 12, the bottom surface of the second prism 20 is the second incident light surface 21, and one isosceles surface of the second prism 20 is the second emitting light surface 22. Thus, the first emitting light surface 12 and the second incident light surface 21 have the same shape and size. When the first emitting light surface 12 and the second incident light surface 21 are arranged opposite each other and parallel to each other, the structure of the optical device 100 is more regular, and the optical device 100 is more stable when the first prism 10 rotates clockwise or counterclockwise around the rotation axis 30.

[0041] Please continue to refer to Figures 1-3 In some embodiments, the object to be tested is disposed at the second light-emitting surface 22, and a second refractive index matching liquid is disposed between the object to be tested and the second light-emitting surface 22 to expel the air between the object to be tested and the second light-emitting surface 22.

[0042] Understandably, there may be an air gap between the second light-emitting surface 22 and the object to be tested. When light enters the second prism 20 from the second light-incident surface 21 and strikes the second light-emitting surface 22, the angle at which it strikes the second light-emitting surface 22 may exceed the total internal reflection angle of the second prism 20. At this time, the light will undergo total internal reflection at the second light-emitting surface 22 and cannot exit from the second light-emitting surface 22. Therefore, by setting a second refractive index matching liquid between the second light-emitting surface 22 and the object to be tested, the air between the second light-emitting surface 22 and the object to be tested is discharged, the total internal reflection condition of the second prism 20 is changed, so that the light will not undergo total internal reflection at the second light-emitting surface 22 and can exit from the second prism 20 to strike the object to be tested.

[0043] It should be noted that the first refractive index matching liquid and the second refractive index matching liquid can be the same or different, as long as the total internal reflection conditions of the first prism 10 or the second prism 20 can be changed so that total internal reflection does not occur when light is incident on the first light-emitting surface 12 or the second light-emitting surface 22.

[0044] Please continue to refer to Figures 1-3In some other embodiments, a matching block may be provided on the side of the object to be tested away from the second light-emitting surface 22, and a third refractive index matching liquid may be provided between the matching block and the object to be tested. Therefore, when testing the transmittance of the object to be tested, total internal reflection of light within the object to be tested can be avoided, which would prevent the transmittance from being measured.

[0045] Please continue to refer to Figures 1-3 In some embodiments, the first prism 10 and the second prism 20 are triangular prisms with different structures and refractive indices. Therefore, the shape and material of the first prism 10 and the second prism 20 can be flexibly set according to different objects to be detected, thereby improving the versatility of the optical device 100.

[0046] Understandably, the first prism 10 and the second prism 20 can also be triangular prisms, quadrangular prisms, or pentaangular prisms, etc., and this embodiment of the present invention does not limit them in this way.

[0047] Please continue to refer to Figures 1-3 In some embodiments, a connecting mechanism is also included. The second prism 20 is fixedly connected to the connecting mechanism, and the first prism 10 is rotatably connected to the connecting mechanism, so that the first prism 10 can rotate clockwise or counterclockwise around the rotation axis 30. Specifically, for example, the connecting mechanism can be a rotating column with a fixed structure, so that the second prism 20 is fixedly set to the rotating column, and the first prism 10 is rotatably connected to the rotating column, so that the first prism 10 can rotate clockwise or counterclockwise around the rotating column. Understandably, in this case, the rotating column is located on the line connecting the center of the first light-emitting surface 12 and the center of the second light-incident surface 21.

[0048] Please continue to refer to Figures 1-3 In some other embodiments, the connecting mechanism can also be other structures, and the connecting mechanism can also be set in other positions, as long as the rotation axis 30 is the line connecting the center of the first light-emitting surface 12 and the center of the second light-incident surface 21, and the first prism 10 can rotate clockwise or counterclockwise around the rotation axis 30. Thus, by setting the connecting mechanism, the stability of the optical device 100 can be further improved, thereby improving the detection accuracy of the optical device 100.

[0049] Please continue to refer to Figures 1-3 In some embodiments, a reference line is provided on the first prism 10, and a scale is provided on the second prism 20, thereby displaying the angle of rotation of the first prism 10 relative to the second prism 20. Alternatively, in some other embodiments, the scale of the second prism 20 can also be used to display the angle of light emitted from the second light-emitting surface 22. Therefore, adjusting the first prism 10 makes it easier for the operator to adjust the angle, thereby simplifying the detection process of the optical device 100 on the object to be detected and improving detection efficiency.

[0050] Please continue to refer to Figures 1-3 In some embodiments, a light emitter and a light receiver are also included. The light emitter is disposed opposite to the first light-incident surface 11 so that the emitted light rays enter the first light-incident surface 11 perpendicularly. The light receiver is used to receive the light rays emitted from the object to be detected for detection and analysis.

[0051] It should be noted that the light emitter is used to emit a light beam. A collimation mechanism can also be provided between the light emitter and the first prism 10. The collimation mechanism is used to collimate the light beam emitted by the light emitter and make the light beam perpendicular to the first light-incident surface 11. The light beam that enters the first prism 10 through the first light-incident surface 11 is transmitted in the first prism 10 and then exits from the first light-exit surface 12. It then passes through the second light-incident surface 21 and is transmitted to the second prism 20. After being transmitted in the second prism 20, it is emitted from the second light-exit surface 22 and is directed towards the object to be detected. After the light beam passes through the object to be detected, it is directed to the light receiver. The light receiver receives the light beam that has passed through the object to be detected and processes and analyzes the received light beam to finally obtain the detection result of the object to be detected.

[0052] Please continue to refer to Figures 1-3 In some optional embodiments, the light emitter is disposed on the first light-incident surface 11. Understandably, since the first prism 10 needs to rotate around the rotation axis 30, and the light emitted by the light emitter needs to be incident perpendicularly from the first light-incident surface 11, the position of the light emitter also needs to be adjusted accordingly when the first prism 10 rotates. In this embodiment of the invention, by directly fixing the light emitter to the first light-incident surface 11, the light emitter will move along with the first prism 10 when it rotates, thus eliminating the need for separate adjustment of the light emitter's position. This further simplifies the detection process of the optical device 100 on the object to be detected, improves detection efficiency, and enhances the stability of the optical device 100.

[0053] Other configurations and operations of the optical device 100 for detection according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0054] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0056] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0057] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An optical device for detection, characterized in that, The optical device includes: A first prism, comprising a first light-incident surface and a first light-outcrying surface, wherein light enters the first prism from the first light-incident surface and exits the first prism from the first light-outcrying surface; The second prism includes a second light-incident surface and a second light-outcrystal surface. Light rays emitted from the first light-outcrystal surface enter the second prism from the second light-incident surface and exit from the second light-outcrystal surface to be directed toward the object to be detected. The first light-emitting surface and the second light-incident surface are arranged opposite to each other and parallel to each other. The line connecting the center of the first light-emitting surface and the center of the second light-incident surface is perpendicular to the first light-emitting surface. The first prism can rotate clockwise or counterclockwise around the line connecting the center of the first light-emitting surface and the center of the second light-incident surface as the rotation axis.

2. The optical device according to claim 1, characterized in that, A first refractive index matching liquid is provided between the first light-emitting surface and the second light-incident surface to expel the air between the first light-emitting surface and the second light-incident surface.

3. The optical device according to claim 2, characterized in that, The first prism and the second prism are isosceles right-angled triangular prisms with the same structure and refractive index.

4. The optical device according to claim 3, characterized in that, One isosceles surface of the first prism is the first incident light surface, the bottom surface of the first prism is the first exiting light surface, the bottom surface of the second prism is the second incident light surface, and one isosceles surface of the second prism is the second exiting light surface.

5. The optical device according to claim 1, characterized in that, The object to be tested is placed at the second light-emitting surface, and a second refractive index matching liquid is placed between the object to be tested and the second light-emitting surface to expel the air between the object to be tested and the second light-emitting surface.

6. The optical device according to claim 1, characterized in that, The first prism and the second prism are triangular prisms with different structures and different refractive indices.

7. The optical device according to claim 1, characterized in that, It also includes a connecting mechanism, wherein the second prism is fixedly connected to the connecting mechanism, and the first prism is rotatably connected to the connecting mechanism, so that the first prism can rotate clockwise or counterclockwise around the rotation axis.

8. The optical device according to claim 1, characterized in that, The first prism has a baseline, and the second prism has a scale, thereby displaying the angle of rotation of the first prism relative to the second prism.

9. The optical device according to claim 1, characterized in that, It also includes a light emitter and a light receiver, wherein the light emitter is disposed opposite to the first light incident surface so that the emitted light rays enter the first light incident surface perpendicularly; The light receiver is used to receive light emitted from the object to be detected for detection and analysis.

10. The optical device according to claim 9, characterized in that, The light emitter is disposed on the first light incident surface.

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