Spectroscopic lens structure and imaging color brightness meter

Abstract

The application discloses a split light lens structure and an imaging color brightness meter, which are used for improving work efficiency and measurement accuracy. The application comprises a lens main body, a light splitting device, a fiber coupler and a fiber flange. The lens main body comprises a front lens group and a rear lens group, the front lens group is used for receiving incident light, the rear lens group is used for being connected with a camera, the light splitting device is arranged in a light path between the front lens group and the rear lens group, the light splitting device is used for splitting the incident light into an imaging light path and a sampling light path, the imaging light path enters the camera through the rear lens group, one end of the fiber coupler is connected with the light splitting device, the other end of the fiber coupler is connected with the fiber flange, the fiber flange is used for fixing a fiber, and the sampling light path enters the fiber through the fiber coupler.

Description

Technical Field

[0001] This application relates to the field of color brightness measurement equipment technology, and in particular to a beam splitter lens structure and an imaging color brightness meter. Background Technology

[0002] An imaging luminance meter is an optical analysis instrument used to measure and analyze the luminance and distribution of an object's surface. Its core functions include single-point luminance measurement, regional luminance statistics (average, maximum, and minimum values), and generation of isoluminance color maps.

[0003] To improve measurement accuracy, traditional imaging colorimeters place a reflector (plane or prism) between the lens and the camera CMOS, and use optical fiber to guide the incident light from the center of the image to a spectrometer. The spectrometer then analyzes and calculates the color coordinates of the center point and feeds the results back to correct the color coordinates of the entire image captured by the camera.

[0004] When placing a reflector inside a traditional imaging luminance meter, a filter wheel needs to be added in front of the camera. A 45-degree total reflection prism is placed in one of the holes of the filter wheel. When the hole is rotated to the position of the lens and the optical axis of the camera, spectral sampling is performed. After sampling is completed, the filter wheel is rotated to other positions, and the camera performs normal photography.

[0005] However, the filter wheel needs to be rotated repeatedly to switch between spectral sampling and photography functions. Repeated rotation takes time and affects work efficiency. Moreover, repeated rotation can easily cause the optical path to become non-coaxial with the fiber optic receiver. Non-coaxiality leads to inaccurate spectral sampling and affects measurement accuracy. Utility Model Content

[0006] To address the aforementioned technical problems, this application provides a beam-splitting lens structure and an imaging colorimeter, which can improve work efficiency and measurement accuracy.

[0007] The technical solution provided in this application is described below: The first aspect of this application provides a beam-splitting lens structure, including: Lens body, beam splitter, fiber optic coupler, and fiber optic flange; The lens body includes a front lens group and a rear lens group. The front lens group is used to receive incident light, and the rear lens group is used to connect to the camera. The beam splitter is disposed in the optical path between the front lens group and the rear lens group. The beam splitter is used to split the incident light into an imaging optical path and a sampling optical path. The imaging optical path enters the camera through the rear lens group. One end of the fiber optic coupler is connected to the beam splitter, and the other end is connected to the fiber optic flange. The fiber optic flange is used to fix the fiber optic cable, and the sampling optical path enters the fiber optic cable through the fiber optic coupler.

[0008] Optionally, the fiber optic coupler includes a coupling sleeve, a shaping lens group, and an aperture. The coupling sleeve is connected between the optical fiber flange and the beam splitter. The shaping lens group and the aperture are sequentially arranged in the coupling sleeve along the transmission direction of the sampling optical path, and the aperture is close to the optical fiber.

[0009] Optionally, the aperture and the coupling sleeve are detachably connected.

[0010] Optionally, the fiber optic flange includes a coupling flange, a ferrule sleeve, a lock nut, a fiber optic ferrule, and a fiber optic tail cap; The coupling flange has a groove at its end facing the fiber optic coupler. The ferrule sleeve is disposed between the coupling flange and the locking nut. The fiber optic ferrule is disposed inside the ferrule sleeve, with one end of the fiber optic ferrule for receiving the sampling optical path protruding from the interior of the coupling flange and located in the groove, while the other end protrudes through the locking nut. The optical fiber is disposed inside the fiber optic ferrule, with one end flush with the end of the fiber optic ferrule for receiving the sampling optical path. The fiber optic tail cap is located on the end of the locking nut away from the coupling flange and has a through hole. The fiber optic tail cap is used to fix the fiber optic ferrule, and the other end of the fiber in the fiber ferrule passes through the through hole.

[0011] Optionally, the coupling flange has a receiving groove on the side facing the locking nut, and the inner wall of the receiving groove has an internal thread that matches the external thread on the locking nut. The insert sleeve has an outer edge at the end facing the coupling flange, the outer edge abutting the bottom of the receiving groove in the direction of the coupling flange, and the locking nut abutting the outer edge in the direction of the coupling flange.

[0012] Optionally, the bottom of the receiving groove is provided with a positioning pin hole, and the end face of the insert sleeve facing the receiving groove is provided with a pin, which matches the positioning pin hole.

[0013] Optionally, the fiber optic flange further includes a set screw, which is respectively disposed on the coupling flange, the ferrule sleeve, and the fiber tail cap. The set screws located on the coupling flange and the ferrule sleeve are used to abut against the fiber optic ferrule, and the set screws located on the fiber tail cap are used to abut against the ferrule sleeve.

[0014] Optionally, the beam splitter includes a beam splitter sleeve and a semi-transparent mirror; the two opposite ends of the beam splitter sleeve are respectively connected to the front mirror group and the rear mirror group, the semi-transparent mirror is disposed inside the beam splitter sleeve, the incident light passes through the semi-transparent mirror to form the imaging optical path, and the incident light is reflected by the semi-transparent mirror to form the sampling optical path.

[0015] Optionally, the reflective surface of the semi-transparent mirror is set at a 45-degree angle to the principal optical axis of the incident light.

[0016] The second aspect of this application provides an imaging colorimeter, including a colorimeter body and a beam-splitting lens structure as described in any of the first aspects and any optional embodiments thereof, wherein the beam-splitting lens structure is connected to the colorimeter body.

[0017] As can be seen from the above technical solutions, this application has the following beneficial effects: This application places a beam splitter between the front and rear lens groups, and connects the fiber optic flange to the beam splitter via a fiber optic coupler. The beam splitter divides the incident light into an imaging path for the camera and a sampling path for the optical fiber. The sampling path passes through the fiber optic coupler and enters the optical fiber inside the fiber optic flange. The optical fiber then guides the sampling path to an external spectrometer for analysis. Thus, during use, part of the light is introduced into the camera for imaging, and the other part is introduced into the external spectrometer for analysis. Unlike traditional filter wheels, there is no need for repeated rotation, which reduces the time spent on repeated rotation and improves work efficiency. At the same time, it avoids to some extent the situation where the optical path and the optical fiber receiver are not aligned, which may occur with traditional filter wheels, thereby ensuring the accuracy of spectral sampling and improving measurement precision. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a beam-splitting lens structure fixed on the body of a colorimeter according to this application; Figure 2 This is a schematic diagram of a beam-splitting lens structure according to this application; Figure 3 This is a schematic diagram of an optical fiber coupler in a beam-splitting lens structure according to this application; Figure 4 This is a schematic diagram of an optical fiber flange in a beam-splitting lens structure according to this application; Figure 5 This is an exploded view of the fiber optic flange in a beam-splitting lens structure according to this application. Figure 6 This is another exploded view of the fiber optic flange in a beam-splitting lens structure according to this application; Figure 7This is another schematic diagram of the fiber optic flange in a beam-splitting lens structure according to this application; Figure 8 This is a schematic diagram of a coupling flange in a beam-splitting lens structure according to this application; Figure 9 This is a schematic diagram of the insert sleeve in a beam-splitting lens structure according to this application; Figure 10 This is a schematic diagram of an imaging colorimeter according to this application; In the figure, the components are: front mirror group 01, rear mirror group 02, beam splitter 03, beam splitter sleeve 04, semi-transparent and semi-reflective mirror 05, fiber optic coupler 06, coupling sleeve 07, shaping mirror group 08, aperture 09, fiber optic flange 10, coupling flange 11, ferrule sleeve 12, locking nut 13, fiber optic ferrule 14, fiber optic tail cap 15, positioning pin hole 16, colorimeter body 17, pin 18, and set screw 19. Detailed Implementation

[0019] In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and other terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.

[0020] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0021] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0022] Furthermore, the structures, proportions, sizes, etc., drawn in the accompanying drawings of this application are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0023] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] Traditional colorimeters require repeated rotation of the filter wheel to switch between spectral sampling and imaging functions, which is time-consuming and inefficient. Furthermore, repeated rotation can cause the optical path to become misaligned with the fiber optic receiver, leading to inaccurate spectral sampling and affecting measurement accuracy. This application proposes a spectroscopic lens structure and imaging colorimeter that pre-splitizes a portion of the incident light using a spectroscopic device, directly introducing it into the spectrometer for analysis. This eliminates the need for traditional filter wheel rotation, thus improving both efficiency and measurement accuracy. The specific implementation structure of this application is described below: See Figures 1 to 10 This application first provides an embodiment of a beam-splitting lens structure, which includes: The lens body comprises a beam splitter 03, an optical fiber coupler 06, and an optical fiber flange 10. The lens body includes a front lens group 01 and a rear lens group 02. The front lens group 01 is used to receive incident light, and the rear lens group 02 is used to connect to the camera. The beam splitter 03 is disposed in the optical path between the front lens group 01 and the rear lens group 02. The beam splitter 03 is used to split the incident light into an imaging optical path and a sampling optical path. The imaging optical path enters the camera through the rear lens group 02. One end of the optical fiber coupler 06 is connected to the beam splitter 03, and the other end is connected to the optical fiber flange 10. The optical fiber flange 10 is used to fix the optical fiber, and the sampling optical path enters the optical fiber through the optical fiber coupler 06.

[0025] The front lens group 01 is used to collect incident light and perform preliminary convergence and correction of the light. The rear lens group 02 is used to transmit the light in the imaging optical path to the camera, ensuring that the camera can receive a clear and accurate imaging optical path.

[0026] The incident light beam forms an imaging optical path and a sampling optical path after passing through the beam splitter 03. The imaging optical path continues along its original direction through the rear mirror group 02 into the camera for normal imaging and capturing to obtain complete image information; the sampling optical path is guided to the fiber optic coupler 06 to provide samples for subsequent spectral analysis.

[0027] After the sampling optical path enters the fiber coupler 06, the fiber coupler 06 will adjust and optimize the light in the sampling optical path (including light intensity, angle and energy distribution, etc.) to ensure that the light can enter the optical fiber efficiently and accurately, thereby improving the quality and accuracy of spectral sampling.

[0028] The fiber optic flange 10 is used to stably fix the fiber optic cable after the fiber optic coupler 06, preventing the fiber optic cable from loosening or shifting during transmission, thereby ensuring that the sampling optical path can be stably transmitted through the fiber optic cable to the subsequent spectrometer for analysis.

[0029] Compared to traditional imaging colorimeters, this embodiment eliminates the need for repeated rotation of the filter wheel to switch between spectral sampling and image capture functions. The spectrometer 03 splits the light into an imaging path and a sampling path in a single operation, allowing the camera to continuously capture images while the sampling path provides stable transmission for spectral analysis, saving time and improving overall efficiency.

[0030] In traditional methods, the repeated rotation of the filter wheel can easily lead to misalignment between the optical path and the fiber optic receiver, resulting in inaccurate spectral sampling. In this embodiment, however, the optical path is relatively fixed, and the connections between the beam splitter 03, fiber optic coupler 06, and fiber optic flange 10 are stable, reducing the possibility of optical path misalignment and ensuring that the sampling optical path can accurately enter the fiber optic cable. This improves the accuracy of spectral sampling and, consequently, guarantees measurement precision.

[0031] Please continue reading. Figure 3 In an optional embodiment, the fiber optic coupler 06 includes a coupling sleeve 07, a shaping lens group 08, and an aperture 09; the coupling sleeve 07 is connected between the fiber optic flange 10 and the beam splitter 03, and the shaping lens group 08 and the aperture 09 are sequentially arranged in the coupling sleeve 07 along the transmission direction of the sampling optical path, with the aperture close to the optical fiber.

[0032] One end of the coupling sleeve 07 is connected to the beam splitter 03, and the other end is connected to the fiber optic flange 10. The coupling sleeve 07 has a through channel inside, in which a shaping mirror group and an aperture 09 are installed. The shaping mirror group is close to the beam splitter 03, and the aperture 09 is close to the optical fiber.

[0033] In this embodiment, the shaping lens group (composed of one or more lenses) functions to refocus or collimate the diverging light beam (sampling optical path) to form a concentrated light spot with a size matching the fiber core diameter. The aperture 09 can restrict and filter the passing light, remove stray light, and accurately control the luminous flux.

[0034] The shaping lens assembly is movable within the coupling sleeve 07 and can be controlled to move along the main optical axis of the sampling optical path, either towards the beam splitter 03 or towards the aperture 09. The shaping lens assembly is used to adjust the optical path, primarily focusing the light from the beam splitter 03 onto the center of the aperture 09. Adjusting the distance between the shaping lens assembly and the beam splitter 03 and the aperture 09 changes the size of the focused light spot. Since the aperture of the aperture 09 remains constant, this alters the luminous flux (changing the intensity of light entering the optical fiber).

[0035] In an optional embodiment, the aperture 09 and the coupling sleeve 07 are detachably connected.

[0036] The aperture 09 is detachable, allowing for the replacement of different aperture 09s with different diameters or slit widths to meet varying light transmission requirements. Furthermore, the aperture 09 can also be an adjustable aperture 09, allowing for adjustment of its diameter as needed.

[0037] By replacing the small aperture stop 09 with different aperture sizes or the slit stop 09 with different slit widths, and adjusting the distance between the shaping lens group 08 and the stop 09, the light intensity entering the optical fiber can be adjusted.

[0038] Please continue reading. Figure 4-6 In one optional embodiment, the fiber optic flange 10 includes a coupling flange 11, a ferrule sleeve 12, a locking nut 13, a fiber optic ferrule 14, and a fiber optic tail cap 15. The coupling flange 11 has a groove at the end facing the fiber optic coupler. The ferrule sleeve 12 is disposed between the coupling flange 11 and the locking nut 13. The fiber optic ferrule 14 is disposed inside the ferrule sleeve 12, with one end of the fiber optic ferrule 14 for receiving the sampling optical path protruding from the interior of the coupling flange 11 and located in the groove, while the other end protrudes through the locking nut 13. The optical fiber is disposed inside the fiber optic ferrule 14, with one end flush with the end of the fiber optic ferrule 14 for receiving the sampling optical path. The fiber optic tail cap 15 is disposed on the end of the locking nut 13 away from the coupling flange 11 and has a through hole. The fiber optic tail cap 15 is used to fix the fiber optic ferrule 14, with the other end of the optical fiber in the fiber optic ferrule 14 protruding through the through hole.

[0039] The coupling flange 11 is detachably connected to the fiber optic coupler 06 (coupling sleeve 07). The coupling flange 11, in conjunction with the locking nut 13, secures the ferrule sleeve 12 within the coupling flange 11. The ferrule sleeve 12 is hollow, and the fiber optic ferrule 14 is located within this hollow area. The fiber optic ferrule 14 is secured by the fiber optic tail cap 15. The locking nut 13 has a knurled outer surface to enhance friction.

[0040] The fiber optic ferrule 14 is also hollow inside. It is used to fix the optical fiber, which is then fixed inside the ferrule 14. One end of the optical fiber is flush with the end of the ferrule 14 (the end closest to the aperture 09). The light from the sampling optical path, after passing through the shaping lens assembly and the aperture 09, illuminates the end face of the optical fiber and is then introduced into the external spectrometer. The fiber optic tail cap 15 is located on the end of the locking nut 13 away from the coupling flange 11 and has a through hole. The fiber optic tail cap 15 is used to fix the fiber optic ferrule 14, and the other end of the optical fiber in the ferrule 14 passes through the through hole.

[0041] In this optional embodiment, the end of the coupling flange 11 facing the fiber coupler is provided with a groove, and the end of the fiber optic ferrule 14 used to receive the sampling optical path protrudes from the interior of the coupling flange 11 and is located in the grooved end.

[0042] In this embodiment, the end of the fiber optic ferrule 14 is tapered, with one end passing through the coupling flange 11 and located within the groove of the coupling flange 11.

[0043] In this optional embodiment, the coupling flange 11 is provided with a receiving groove on the side facing the locking nut 13, and the inner wall of the receiving groove is provided with an internal thread that matches the external thread on the locking nut 13; the insert sleeve 12 is provided with an outer edge on the end facing the coupling flange 11, and the outer edge abuts against the bottom of the receiving groove in the direction of the coupling flange 11, and the locking nut 13 abuts against the outer edge in the direction of the coupling flange 11.

[0044] In this embodiment, the coupling flange 11 and the locking nut 13 are connected by threads. Specifically, an internal thread is provided on the inner wall of the receiving groove of the coupling flange 11, and a protrusion is provided on the locking nut 13. An external thread is provided on the protrusion. The protrusion is screwed into the receiving groove by the cooperation of the internal thread and the external thread.

[0045] The ferrule sleeve 12 has an outer edge located at the end of the ferrule sleeve 12 facing the coupling flange, and the outer diameter of the outer edge is larger than the outer diameter of the ferrule sleeve 12. This outer edge abuts against the bottom of the receiving groove in the direction of the coupling flange 11, and the end face of the protrusion of the locking nut 13 abuts against this outer edge in the direction of the coupling flange 11, thereby fixing the ferrule sleeve 12 and ensuring that the fiber insertion depth remains constant, preventing measurement errors caused by changes in the depth of the fiber optic ferrule 14.

[0046] Please continue reading. Figures 7-9 In this optional embodiment, the bottom of the receiving groove is provided with a positioning pin hole 16, and the end face of the insert sleeve 12 facing the receiving groove is provided with a pin 18, which matches the positioning pin hole 16.

[0047] The number of positioning pin holes 16 is at least one, and the number of positioning pin holes 16 is the same as the number of pins 18. After the ferrule sleeve 12 is inserted into the receiving groove, the pins 18 are aligned and embedded in the positioning pin holes 16, thereby limiting the rotation between the ferrule sleeve 12 and the coupling flange 11, and thus preventing measurement errors caused by the angular rotation of the fiber optic ferrule 14.

[0048] The fiber optic ferrule 14 is fixed inside the ferrule sleeve 12, and the fixing method is achieved by the set screw 19; the fiber optic flange of this application also includes a set screw 19, which is used to fix the fiber optic ferrule 14 and restrict the movement of the fiber optic ferrule 14 inside the ferrule sleeve 12 by setting the set screw 19. In this application, the set screw 19 is provided in three locations. Specifically, the set screw 19 is provided on the ferrule sleeve 12 to restrict the movement of the fiber optic ferrule 14 (the set screw 19 is screwed inward from the side of the ferrule sleeve 12 until it is tightly abutted against the outer wall of the fiber optic ferrule 14); the set screw 19 is also provided on the tail cap 15, and the set screw 19 on the tail cap 15 is used to restrict the movement of the tail cap 15 on the ferrule sleeve 12 (the set screw 19 is screwed inward from the side of the tail cap 15 until it is tightly abutted against the outer wall of the ferrule sleeve 12), thereby further fixing the fiber optic ferrule; the set screw 19 is also provided on the coupling flange 11 to restrict the position of the fiber optic ferrule 14 (the set screw 19 is screwed inward from the outer wall of the coupling flange 11 and directly abutted against the outer wall of the fiber optic ferrule 14), preventing the fiber optic ferrule 14 from exiting the coupling flange 11 during use.

[0049] In an optional embodiment, the beam splitter 03 includes a beam splitter sleeve 04 and a semi-transparent mirror 05; the two ends of the beam splitter sleeve 04 are respectively connected to the front mirror group 01 and the rear mirror group 02, and the semi-transparent mirror 05 is disposed inside the beam splitter sleeve 04. Figure 2 As shown, the front mirror group 01 and the rear mirror group 02 are positioned opposite each other at both ends of the beam splitter 04. The incident light passes through the semi-transparent mirror 05 to form an imaging optical path, and the incident light is reflected by the semi-transparent mirror 05 to form a sampling optical path. This application is not limited thereto.

[0050] Beam splitter 04 is connected between front lens group 01 and rear lens group 02. Inside beam splitter 04, there is a through channel connecting front lens group 01 and rear lens group 02. Semi-transparent mirror 05 is fixed in the through channel inside beam splitter 04.

[0051] The semi-transparent and semi-reflective mirror 05 has the characteristics of being semi-transparent and semi-reflective. When incident light enters the beam splitter 04 at a certain angle and shines on the semi-transparent and semi-reflective mirror 05, due to the semi-transparent and semi-reflective characteristics, the incident light will be split into two parts: one part of the light is reflected (as mentioned above in the sampling light path) and changes its propagation direction; the other part of the light continues to propagate along the original direction through the prism (as mentioned above in the imaging light path).

[0052] The semi-transparent and semi-reflective mirror 05 can be a flat beam splitter formed by coating a semi-transparent and semi-reflective film on an optical flat plate; or it can be a beam splitter prism (such as a right-angle prism or a cubic prism) with a semi-transparent and semi-reflective film layer.

[0053] In an optional embodiment, the reflective surface of the semi-transparent mirror 05 is set at a 45-degree angle to the principal optical axis of the incident light.

[0054] In this optional embodiment, the beam splitter 04 is connected to the front lens group 01 and the rear lens group 02 by means of threaded connection.

[0055] In this embodiment, the threaded connection allows for easy disassembly and replacement.

[0056] Please see Figure 1 and Figure 7 The present application further provides an embodiment of an imaging colorimeter, which includes: a colorimeter body and a beam-splitting lens structure of any of the foregoing embodiments, wherein the beam-splitting lens structure is connected to the colorimeter body.

[0057] In this embodiment, the rear lens group 02 in the beam splitter lens structure is detachably connected to the colorimeter body 17, which can be a snap-fit ​​connection, a threaded connection, etc.

Claims

1. A beam-splitting lens structure, characterized in that, include: Lens body, beam splitter, fiber optic coupler, and fiber optic flange; The lens body includes a front lens group and a rear lens group. The front lens group is used to receive incident light, and the rear lens group is used to connect to the camera. The beam splitter is disposed in the optical path between the front lens group and the rear lens group. The beam splitter is used to split the incident light into an imaging optical path and a sampling optical path. The imaging optical path enters the camera through the rear lens group. One end of the fiber optic coupler is connected to the beam splitter, and the other end is connected to the fiber optic flange. The fiber optic flange is used to fix the fiber optic cable, and the sampling optical path enters the fiber optic cable through the fiber optic coupler.

2. The beam-splitting lens structure according to claim 1, characterized in that, The fiber optic coupler includes a coupling sleeve, a shaping lens group, and an aperture; The coupling sleeve is connected between the optical fiber flange and the beam splitter. The shaping lens group and the aperture are sequentially arranged in the coupling sleeve along the transmission direction of the sampling optical path, and the aperture is close to the optical fiber.

3. The beam-splitting lens structure according to claim 2, characterized in that, The aperture and the coupling sleeve are connected in a detachable manner.

4. The beam-splitting lens structure according to claim 1, characterized in that, The fiber optic flange includes a coupling flange, a ferrule sleeve, a lock nut, a fiber optic ferrule, and a fiber optic tail cap; The coupling flange has a groove at the end facing the fiber coupler. The ferrule sleeve is disposed between the coupling flange and the locking nut. The fiber ferrule is disposed inside the ferrule sleeve. One end of the fiber ferrule, which is used to receive the sampling optical path, protrudes from the inside of the coupling flange and is located in the groove, while the other end protrudes from the locking nut. The optical fiber is disposed inside the optical fiber ferrule and one end of it is flush with the end of the optical fiber ferrule used to receive the sampling optical path. The fiber optic tail cap is located on the end of the locking nut away from the coupling flange and has a through hole. The fiber optic tail cap is used to fix the fiber optic ferrule, and the other end of the fiber in the fiber ferrule passes through the through hole.

5. The beam-splitting lens structure according to claim 4, characterized in that, The coupling flange has a receiving groove on the side facing the locking nut, and the inner wall of the receiving groove has an internal thread that matches the external thread on the locking nut. The insert sleeve has an outer edge at the end facing the coupling flange, the outer edge abutting the bottom of the receiving groove in the direction of the coupling flange, and the locking nut abutting the outer edge in the direction of the coupling flange.

6. The beam-splitting lens structure according to claim 5, characterized in that, The bottom of the receiving groove is provided with a positioning pin hole, and the end face of the insert sleeve facing the receiving groove is provided with a pin, which matches the positioning pin hole.

7. The beam-splitting lens structure according to claim 4, characterized in that, The fiber optic flange also includes a set screw, which is respectively disposed on the coupling flange, the ferrule sleeve and the fiber tail cap. The set screws located on the coupling flange and the ferrule sleeve are used to abut against the fiber optic ferrule, and the set screws located on the fiber tail cap are used to abut against the ferrule sleeve.

8. The beam-splitting lens structure according to any one of claims 1 to 7, characterized in that, The beam splitter includes a beam splitter sleeve and a semi-transparent mirror; the two opposite ends of the beam splitter sleeve are respectively connected to the front mirror group and the rear mirror group, the semi-transparent mirror is disposed inside the beam splitter sleeve, the incident light passes through the semi-transparent mirror to form the imaging light path, and the incident light is reflected by the semi-transparent mirror to form the sampling light path.

9. The beam-splitting lens structure according to claim 8, characterized in that, The reflective surface of the semi-transparent mirror is set at a 45-degree angle to the principal optical axis of the incident light.

10. An imaging colorimeter, characterized in that, The invention includes a colorimeter body and a beam-splitting lens structure as described in any one of claims 1 to 9, wherein the beam-splitting lens structure is connected to the colorimeter body.

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