CN219574486U - Visual microscopic lens of optic fibre core - Google Patents

Abstract

The utility model discloses a microscopic lens with a visual fiber core, and belongs to the technical field of optical imaging. Comprises an optical microscope lens and an imaging device; the optical microscope lens comprises a first lens, a second lens and a third lens; the center of the left side of the second lens is provided with a bulge. The convex design of the center part of the second lens is used for realizing the respective imaging of the fiber core and the cladding, so that the imaging depth of field of the focusing distance between the fiber core and the cladding is adjusted, the fiber core and the cladding are focused on a unified imaging plane, and finally, the fiber stress clear imaging with self-adaption of the fiber core and the cladding imaging is formed; through the special design of three lenses, the device and processing cost of the system are also greatly reduced, the system structure is simple, and the assembly and the debugging are more convenient.

Description

Visual microscopic lens of optic fibre core

Technical Field

The utility model relates to the technical field of optical imaging, in particular to a microscopic lens with a visible optical fiber core.

Background

Optical fibers have been used in a very wide variety of applications as a basic communication and information transfer medium. In some applications it is desirable to be able to observe the core of an optical fiber, or to distinguish between the refractive indices of the core and cladding. For example, in fusion splicing and cold splicing of optical fibers, if the cores of the optical fibers can be observed and matched and aligned with respect to the cores, fusion splicing loss can be reduced to the greatest extent, and especially in polarization-maintaining optical fibers, photonic crystal fibers and other non-circularly symmetric optical fibers, not only the distribution of the cores, but also the distribution of refractive indexes, stresses and the like of the whole optical fibers need to be seen, and the optical axes need to be adjusted for matching. In the measurement of refractive index of some optical fibers or prefabricated bars, the qualification rate of the optical fibers is measured, the difference of refractive index of the fiber core and the cladding of the optical fibers is required to be clearly observed for some specially treated optical fibers, and meanwhile, the distribution of light fields and stress is required to be seen, so that the microscopic imaging technology of the optical fibers is widely demanded.

The refractive indexes of the fiber core and the cladding of the optical fiber are different, so that the focusing distance of light passing through the optical fiber is different, and the propagation directions of transmitted light are also different, wherein the transmitted light of the fiber core is only positioned in the middle part, the transmitted light of the cladding is positioned on two sides, and no overlapping part exists between the two. That is, the focusing distance of the transmitted light after passing through the core and the cladding of the optical fiber is different from front to back, after being imaged by the same objective lens, the image surface is provided with a large field area, scattering spots can appear in the middle or two sides of the imaging device, and the refractive index difference and the light field and stress distribution of the optical fiber are difficult to be clearly observed.

In a process of observing the optical fiber from the side of a common optical microscope, since the optical fiber is cylindrical, the fiber core and the cladding are not in the same focal plane, and it is difficult to show the difference between the fiber cladding and the fiber core. The adjustable-focus optical microscope lens mainly utilizes a lens in a common optical microscope, an axial focusing device is added, clear imaging and defocusing imaging of an optical fiber can be realized, light distribution after refraction caused by different refractive indexes of a fiber core and a cladding of the optical fiber can be obtained during defocusing, and the defects are that the focusing device and a motor are structurally added, and the complexity of a system is increased.

A polarized light microscope is adopted, a polarizer is placed in front of a light source and used for changing light emitted by the light source into linearly polarized light, meanwhile, a polaroid is added in front of the microscope, the included angle of optical axes of the two polaroids is 90 degrees, light emitted by the light source is guaranteed, and the light cannot be incident into an optical microscope lens for imaging under the general extinction effect of the polaroids. When the optical fiber is used for observing the side face of the optical fiber, the optical fiber is placed between the polarizer and the polaroid, and due to different refractive index distribution, stress change and the like of the optical fiber, part of light rays penetrate the polaroid to be imaged, and the imaging effect is related to the internal refractive index and stress distribution of the optical fiber. This method is generally used for side viewing and centering of polarization maintaining fibers. The defects are high cost, complex structure and difficult assembly and adjustment.

In order to solve the technical problems, the utility model respectively designs the fiber core and the cladding for imaging, and modifies the curvature radius of the central part of a certain lens to form an objective imaging system which is respectively adaptive and can carry out clear imaging on the same surface; the middle part of the biconvex lens is convexly designed to realize the respective imaging of the fiber core and the cladding, so that the imaging depth of field of the focusing distance between the fiber core and the cladding is changed, and the fiber stress clear imaging with self-adaption of the imaging of the fiber core and the cladding is formed.

Disclosure of Invention

In order to solve the problems, a microscope lens with a visible optical fiber core is provided, and the microscope lens with the visible optical fiber core comprises an optical microscope lens and an imaging device; the optical microscope lens comprises 2 convex lenses and 1 concave lens; the optical microscope lens comprises a first lens, a second lens and a third lens; the center of the left side of the second lens is provided with a bulge. The projection design of the center part of the second lens is used for realizing the respective imaging of the fiber core and the cladding, so that the imaging depth of field of the focusing distance between the fiber core and the cladding is adjusted, the fiber core and the cladding are focused on a unified imaging plane, and finally, the fiber stress clear imaging with self-adaption of the fiber core and the cladding imaging is formed.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows.

A microscopic lens with a visual fiber core comprises an optical microscopic lens and an imaging device; the optical microscope lens comprises 2 convex lenses and 1 concave lens; the optical microscope lens comprises a first lens, a second lens and a third lens; the left center of the second lens is provided with a bulge; after light is transmitted from the side face of the optical fiber, the light sequentially passes through the first lens, the second lens and the third lens of the optical microscope lens, and is amplified and then projected onto an imaging device for imaging.

Preferably, the first lens is designed as a convex lens by adopting aspheric processing.

Preferably, the second lens is designed as a convex lens by adopting aspheric processing.

Preferably, the mirror surface curvature radius of the left side convex portion of the second lens is smaller than that of the right side mirror surface.

Preferably, the protrusion and the second lens are formed by integrally processing or gluing the lenses.

Preferably, the curvature, caliber and height of the protrusions are smaller than those of the second lens.

Preferably, the third lens is designed as a biconcave lens by adopting an aspheric surface processing.

Preferably, the radius of curvature of the left mirror surface of the third lens is smaller than that of the right mirror surface.

Preferably, the imaging device includes a CMOS image sensor or a CCD image sensor.

Preferably, the resolution of the imaging device is 640×480 or 1024×768 or 1280×1024.

By adopting the technical scheme, the utility model has the following beneficial effects.

1. According to the utility model, through the convex design of the central part of the second lens, the imaging of the fiber core and the cladding is respectively realized, so that the imaging depth of field of the focusing distance between the fiber core and the cladding is adjusted, the fiber core and the cladding are focused on a unified imaging plane, and finally, the fiber stress clear imaging with self-adaption of the fiber core and the cladding is formed.

2. According to the utility model, the depth of field adjustment of different imaging focusing distances of the fiber core and the cladding of the optical fiber can be realized by only special designs of the three lenses, the clear imaging of the refractive index difference and the stress field of the optical fiber is realized, other related polarizer, polaroid, diaphragm and other components and complicated assembly table debugging are not required, the device and processing cost of the whole optical microscope lens are greatly reduced, the system structure is simple, and the assembly and debugging are more convenient.

3. The utility model realizes the amplification imaging of the optical field and stress of the optical fiber through the optical microscope lens formed by the three lens lenses.

Drawings

The making and using of the preferred embodiments of the present utility model are discussed in detail below. It should be appreciated that the present utility model provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are provided to illustrate the manner of making and using the utility model and are not intended to limit the scope of the utility model, as other figures can be made from these figures by one of ordinary skill in the art without undue burden.

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is an enlarged side view of an optical fiber according to the present utility model.

Fig. 3 is a side-on-side imaging view of an optical fiber of the present utility model.

Fig. 4 is a graph of the brightness variation of the present utility model.

Wherein, 1-optical fiber; 2-a first lens; 3-a second lens; 4-a third lens; 5-an imaging device; 6-bump.

Detailed Description

The making and using of the preferred embodiments of the present utility model are discussed in detail below. It should be appreciated that the present utility model provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the utility model, and do not limit the scope of the utility model.

Examples

A microscope lens with a visual fiber core as shown in fig. 1 comprises an optical microscope lens and an imaging device 5; the optical microscope lens comprises 2 convex lenses and 1 concave lens; the optical microscope lens comprises a first lens 2, a second lens 3 and a third lens 4; a bulge 6 is arranged at the left center of the second lens 3; after light is transmitted from the side face of the optical fiber 1, the light passes through the first lens 2, the second lens 3 and the third lens 4 of the optical microscope lens in sequence, and is amplified and then projected onto the imaging device 5 for imaging.

The first lens 2 is designed to be a convex lens by adopting aspheric surface processing. The second lens 3 is designed to be a convex lens by adopting aspheric surface processing. The radius of curvature of the mirror surface of the left part of the second lens 3 except the bulge 6 is smaller than that of the right mirror surface. The bulge 6 and the second lens 3 are formed by integrally processing or gluing the lenses. The curvature, caliber and height of the protrusions 6 are smaller than those of the second lens 3. The third lens 4 is designed into a biconcave lens by adopting aspheric processing. The radius of curvature of the left mirror surface of the third mirror 4 is smaller than that of the right mirror surface. The imaging device 5 includes a CMOS image sensor or a CCD image sensor. The resolution of the imaging device 5 is 640×480 or 1024×768 or 1280×1024.

When the optical fiber 1 is irradiated from the side and transmitted through the optical fiber 1, the optical fiber 1 emits light, and after passing through the optical microscope, the light is projected onto the imaging device 5 to be magnified and imaged, and the imaging is shaped like a glass rod at this time, as shown in fig. 2. But due to the defocusing effect of the small-caliber aspheric convex 6 in the middle of the aspheric object lens of the second lens 3, light redistribution is collected and imaged. At this time, the imaging of the optical fiber 1 and the imaging of the redistribution of light by the optical fiber 1 are superimposed on each other, and imaged on the imaging device 5 as shown in fig. 3.

At this time, the optical fiber 1 passing through the fiber core is reassigned through the bulge 6 on the second lens 3, and the other optical fields not passing through the fiber core form a clear image with equal depth of field, and the clear image have no focusing distance difference, so that the cladding layer and the fiber core of the optical fiber 1 can be imaged clearly at the same time, the diffuse spots formed by the traditional optical microscope at the center position of the defocused fiber core can be eliminated, the distribution details and stress distribution details of the refractive index of the optical fiber 1 can be fully displayed, and at this time, the brightness and brightness change curve on the imaging device 5 is shown as a graph in fig. 4.

The following describes the structure of the present microscope lens further in schematic figures 1-4.

A microscope lens with a visual fiber core as shown in fig. 1 comprises an optical microscope lens and an imaging device 5; the optical microscope lens comprises 2 convex lenses and 1 concave lens; the optical microscope lens comprises a first lens 2, a second lens 3 and a third lens 4; the center of the left side of the second lens 3 is provided with a bulge 6. The first lens 2, the second lens 3, the third lens 4 and the protrusions 6 are made of silica gel, PMMA, polycarbonate or glass materials. The first lens 2 is designed to be a convex lens by adopting aspheric surface processing, and the left side curvature radius of the first lens 2 is similar to or different from the right side, and is mainly used for amplifying and converging light irradiated by the side surface of the optical fiber 1, and performing preliminary amplification and light focusing.

The second lens 3 is designed into a convex lens by adopting aspheric surface processing, and the radius of curvature of the mirror surface of the part of the left side of the second lens 3 except the bulge 6 is smaller than that of the right side mirror surface. The second lens 3 is mainly used for amplifying and converging the light projected at the cladding of the optical fiber 1 after passing through the first lens 2. The center position of the left side of the second lens 3 is provided with a bulge 6 through integral lens processing or gluing connection, the curvature, caliber and height of the bulge 6 are smaller than those of the second lens 3, the bulge 6 is mainly used for converging and amplifying the optical fiber 1 of the fiber core after passing through the second lens 3, and the focusing distance and depth of field of the fiber core after passing through the second lens 3 are adjusted, so that the focusing distance of the fiber core light at the center position is equal to the focusing distance projected at the cladding after passing through the second lens 3 and is positioned on the same vertical imaging plane.

The third lens 4 is used for converging and amplifying the light rays regulated by the protrusion 6 and the second lens 3, and transmitting the light rays to the imaging device 5 for clear imaging. The adjustment of the focusing distance and the depth of field of the fiber cores and the cladding of the optical fibers 1 with different types of side surfaces can be realized by adjusting the coaxial linear distance of the lens inside the optical microscope lens and the distance from the whole optical microscope lens to the imaging device 5, so that the stress and the clear imaging of the optical fields of the optical fibers 1 with different types are ensured.

The imaging device 5 includes a CMOS image sensor or a CCD image sensor. The resolution of the imaging device 5 is 640 x 480, 1024 x 768, or 1280 x 1024, which is used for receiving the light beam projected by the third lens 4 and implementing the imaging of the core and the cladding of the optical fiber 1 on the vertical imaging plane.

When light irradiates the optical fiber 1 from the side surface of the optical fiber 1, because the optical fiber 1 is cylindrical or symmetrical and non-cylindrical, and the refractive indexes of the fiber core and the cladding of the optical fiber 1 are different, the light projected out of the optical fiber 1 can be subjected to complex light field distribution, the light passing through the fiber core of the optical fiber 1 can be concentrated and focused at a central position, and the superposition, focusing position and depth of field of the light exist compared with the migration of the light passing through the cladding, so that the light scattering spots presented on an imaging plane can not be displayed, and the stress and the light field distribution details of the fiber core of the optical fiber 1 can not be displayed. The system respectively designs the light passing through the fiber core of the optical fiber 1 and the cladding, and changes the focusing distance and the depth of field of the fiber core of the optical fiber 1 through the bulge 6, so that the focusing position of the light projected and imaged by the fiber core of the optical fiber 1 and the projection focusing position of the cladding are positioned on the same vertical plane, and the stress and the clear imaging of the light field of the fiber core of the optical fiber 1 and the cladding are ensured by the imaging device 5.

The utility model realizes the imaging of the fiber core and the cladding of the optical fiber 1 respectively by designing the bulge 6 at the center part of the second lens 3, thereby adjusting the imaging depth of field of the focusing distance between the fiber core and the cladding of the optical fiber 1, so that the fiber core and the cladding are focused on the same imaging plane, and finally, the self-adaptive light stress clear imaging of the fiber core and the cladding is formed; the amplification imaging of the light field and stress of the optical fiber 1 is realized through an optical microscope lens formed by three lens lenses; the system can realize the depth of field adjustment of different imaging focusing distances of the fiber core and the cladding of the optical fiber 1 only through the special design of the three lenses, realize the clear imaging of the refractive index difference and the stress field of the optical fiber 1, and does not need to increase other related polarizer, polaroid, diaphragm and other components and complicated assembly table debugging, so that the device and processing cost of the whole optical microscope lens are greatly reduced, the system structure is simple, and the assembly and debugging are more convenient.

Although the specification has been described in detail, it should be understood that various changes, substitutions and alterations can be made hereto without departing from the spirit and scope of the utility model as defined by the appended claims. Furthermore, the particular embodiments described are not intended to limit the scope of the utility model, as one of ordinary skill in the art will readily appreciate from the disclosure that processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, may perform substantially the same function or achieve substantially the same result as the embodiments of the present utility model. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.

Claims (7)

1. The utility model provides a visual micro-lens of optic fibre core which characterized in that: comprises an optical microscope lens and an imaging device; the optical microscope lens comprises 2 convex lenses and 1 concave lens; the optical microscope lens comprises a first lens, a second lens and a third lens; the left center of the second lens is provided with a bulge; after light is transmitted from the side face of the optical fiber, the light sequentially passes through the first lens, the second lens and the third lens of the optical microscope lens, and is amplified and then projected onto an imaging device for imaging.

2. A fiber optic core viewing microscope lens as recited in claim 1, wherein: the first lens is designed to be a convex lens by adopting aspheric surface processing.

3. A fiber optic core viewing microscope lens as recited in claim 1, wherein: the second lens is designed into a convex lens by adopting aspheric surface processing, and the radius of curvature of the mirror surface of the left part except the convex part of the second lens is smaller than that of the right mirror surface.

4. A fiber optic core viewing microscope lens as recited in claim 3, wherein: the bulge and the second lens are formed by integrally processing or gluing the lenses.

5. A fiber optic core viewing microscope lens as recited in claim 4, wherein: the curvature, caliber and height of the bulge are smaller than those of the second lens.

6. A fiber optic core viewing microscope lens as recited in claim 1, wherein: the third lens is designed into a biconcave lens by adopting aspheric surface processing, and the curvature radius of the left side mirror surface of the third lens is smaller than that of the right side mirror surface.

7. A fiber optic core viewing microscope lens as recited in claim 1, wherein: the imaging device includes a CMOS image sensor or a CCD image sensor.