Probing type imaging method and probing type imaging device for multi-core optical fiber
The multi-core optical fiber penetration imaging device addresses low resolution and complexity issues by directly forming optical focusing and reflection components on the fiber end face, increasing pixel count and resolution through innovative pixel count and imaging devices, and improving the imaging device's resolution.
Patent Information
- Application Number
- CN202411361891.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-01-03
AI Technical Summary
Existing fiber-optic penetration imaging devices based on single-core optical fibers suffer from low resolution due to limited pixel points, making them unsuitable for precise and complex environments, and their compactness is compromised by the need for bonded optical components.
A multi-core optical fiber penetration imaging device is developed, where optical focusing and reflection components are directly prepared on the end face of a multi-core optical fiber, utilizing a 45° inclined reflection surface formed by grinding and melting, enabling high-resolution imaging through increased pixel count.
The multi-core optical fiber device achieves a compact, high-resolution imaging solution by increasing the pixel count and improving the imaging device's resolution, simplifying the manufacturing process and enhancing the imaging device's effectiveness in various complex environments, and improving the imaging device's resolution.
Smart Images
Figure CN119247615A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of optical fiber penetration imaging, and in particular relates to a multi-core optical fiber penetration imaging method and a penetration imaging device. Background Art
[0002] Penetration imaging has important applications in the fields of medicine, exploration and surveying, industrial detection, and scientific research. The fiber-optic-based penetration imaging device plays an irreplaceable role in illumination imaging in narrow spaces and complex environments due to its small diameter and bendability. Different from the fiber-optic penetration imaging device in the prior art that installs or bonds the optical fiber with optical components such as focusing lenses or reflectors, the fiber-optic penetration imaging device that directly prepares optical focusing and reflection components on the transmission optical fiber to simultaneously support light guidance, illumination, reflection, and image collection not only has a more compact structure, but also can effectively reduce the difficulty of preparing the device.
[0003] While optimizing the structure, as an imaging device, it is more necessary to have the resolution of the transmitted image. However, the fiber optic penetration imaging device in the prior art is usually based on a single-core optical fiber, and a single optical fiber core only provides one pixel point, so it is difficult to ensure high-resolution imaging effects. For some environments that require precise operation or complex environments, this type of fiber optic penetration imaging device cannot provide clear transmission images to meet the needs of actual applications, which seriously restricts the application scenarios of this type of imaging device and greatly increases the difficulty of operation. Summary of the invention
[0004] The technical problem to be solved by the present invention is to provide a multi-core optical fiber penetration imaging method and a penetration imaging device. The present invention adopts a multi-core optical fiber penetration imaging device, and directly prepares optical focusing and reflection components on the end face of the multi-core optical fiber, so that the multi-core optical fiber itself can directly focus, reflect and transmit the signal, thereby ensuring the compactness of the structure and ease of manufacture of the overall device; because the multi-core optical fiber has a larger number of cores, the use of multi-core optical fiber can effectively increase the number of imaging pixels and significantly improve the resolution of the transmitted image.
[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A multi-core optical fiber penetration imaging method adopts a multi-core optical fiber penetration imaging device, the multi-core optical fiber penetration imaging device comprises a multi-core optical fiber cladding, a multi-core optical fiber core, an optical fiber end face sphere and a reflection surface, the multi-core optical fiber cladding is coated on the outside of the multi-core optical fiber core, the optical fiber end face sphere is located at the end of the multi-core optical fiber, the optical fiber end face sphere is directly formed by heating and melting one end of the multi-core optical fiber, the multi-core optical fiber comprises a multi-core optical fiber cladding and a multi-core optical fiber core; the reflection surface is an inclined surface formed by grinding the optical fiber end face sphere; The following steps are involved: S1. Using an arc welding machine to prepare an optical fiber end face sphere at the end face of a multi-core optical fiber; S2, grinding the optical fiber end surface sphere by an optical fiber grinder until an inclined reflecting surface is ground out of the optical fiber end surface sphere; S3, the core of the multi-core optical fiber transmits the illumination beam into the sphere of the optical fiber end surface, the illumination beam is reflected by the reflection surface on the sphere of the optical fiber end surface to the curved surface of the sphere of the optical fiber end surface, and the curved surface of the sphere of the optical fiber end surface focuses the illumination beam to illuminate the observation area; S4, the imaging light beam reflected back from the observation area is focused and collected by the curved surface of the sphere at the end face of the optical fiber, the collected imaging light beam is reflected by the reflecting surface, and the reflected imaging light beam is transmitted to the core of the multi-core optical fiber for transmission; S5. The reflecting surface is used to reflect the illumination beam to the spherical surface of the optical fiber end face for focusing and to reflect the imaging beam collected by the sphere of the optical fiber end face back to the core of the multi-core optical fiber for final imaging.
[0006] Preferably, in step S1, one end of the multi-core optical fiber is cut by a commercial optical fiber cutter to ensure that the end face of the multi-core optical fiber is cut flat and intact; the optical fiber end face is wiped with anhydrous ethanol to ensure that the optical fiber end face is clean; Preferably, the processed optical fiber end face is placed in the electrode heating end of the arc welding machine, and the arc temperature of the arc discharge system is set to 3000°C, which is sufficient to melt the multi-core optical fiber; during the melting process of the multi-core optical fiber, the surface tension will cause the multi-core optical fiber to form a sphere on the optical fiber end face at the discharge location.
[0007] Preferably, in order to overcome the influence of gravity during the process of melting the fiber end face sphere to form a regular sphere, the multi-core optical fiber needs to be rotated during the process of making the fiber end face sphere using only an arc welding machine; Preferably, in step S2, the optical fiber end surface sphere is fixed to a grinding disc of an optical fiber grinding machine, and the grinding disc is at an angle of 45° to the grinding paper; Preferably, the rotation speed of the grinding disk of the optical fiber grinder is set to 150 RPM, and the optical fiber end surface sphere is gradually ground using 8000 mesh, 2000 mesh, 1200 mesh and 600 mesh grinding papers until a 45° flat and smooth surface is formed.
[0008] Preferably, the first step of rough grinding of the optical fiber end face sphere is performed by 8000 mesh grinding paper until the sphere is ground into a 45° surface; the 45° surface is further polished by 2000 mesh, 1200 mesh and 600 mesh grinding papers until the 45° surface is polished and bright.
[0009] Preferably, in order to increase the reflectivity of the reflecting surface, a wide-band high-reflective film, including a dielectric film and a metal film, may be plated on the reflecting surface.
[0010] A probe imaging device for a multi-core optical fiber comprises a multi-core optical fiber cladding, a multi-core optical fiber core, an optical fiber end face sphere and a reflecting surface. The multi-core optical fiber cladding is coated on the outside of the multi-core optical fiber core. The optical fiber end face sphere is located at the end of the multi-core optical fiber. The optical fiber end face sphere is directly formed by heating and melting one end of the multi-core optical fiber. The multi-core optical fiber comprises a multi-core optical fiber cladding and a multi-core optical fiber core. The reflecting surface is an inclined surface formed by grinding the optical fiber end face sphere. Preferably, the reflecting surface is a 45° inclined surface.
[0011] Preferably, the multi-core optical fiber is a 7-core optical fiber, the number of cores is 7, and the cladding diameter of the optical fiber is 125 μm.
[0012] The present invention can achieve the following beneficial effects: The present invention utilizes multi-core optical fiber to directly melt the end face of the optical fiber to prepare a sphere, which can effectively focus and collect the optical signal. By grinding the sphere of the end face of the multi-core optical fiber at 45 degrees, a reflection surface can be directly prepared on the sphere of the end face of the optical fiber, and the collected optical signal can be reflected back to the core of the multi-core optical fiber for transmission. Compared with the prior art, the present invention simplifies the structure of the optical fiber insertion imaging device, and directly grinds the focusing sphere and the reflection surface on the end face of the multi-core optical fiber without bonding or installation with other optical components, making the imaging device more compact. The multi-core optical fiber used can obtain more pixels than a single-core optical fiber, greatly improving the resolution of the transmitted image and breaking the inherent defects of imaging based on a single-core optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic structural diagram of a multi-core optical fiber penetration imaging device of the present invention; Figure 2 is a cross-sectional view of a multi-core optical fiber of the present invention; Figure 3 A flow chart was made for the present invention. DETAILED DESCRIPTION
[0014] Penetration imaging devices based on optical fiber media play an irreplaceable role in the fields of biomedicine, industrial processing, and surveying and exploration due to their small size, flexibility, low cost, and long-distance transmission capabilities. Unfortunately, existing technologies often bond or install components such as conical lenses and reflectors on the end faces of optical fibers for imaging and transmission, which not only increases the complexity of device manufacturing, but also reduces the compactness of the device. In addition, current penetration imaging devices based on optical fiber media are usually based on single-core optical fibers, and the optical signal is received by a single fiber core through reflection. Such a structure results in only one pixel for imaging, and it is impossible to obtain high-resolution transmission images, which greatly increases the difficulty of use in actual situations.
[0015] like Figure 1 As shown, this embodiment provides a multi-core optical fiber penetration imaging device, including a multi-core optical fiber cladding 1, a multi-core optical fiber core 2, an optical fiber end face sphere 3 and a reflective surface 4. The optical fiber end face sphere 3 is directly formed by heating and melting one end of a multi-core optical fiber including a multi-core optical fiber cladding 1 and a multi-core optical fiber core 2 by an arc welding machine, and the reflective surface 4 is a 45° inclined surface, and the reflective surface 4 is formed by grinding the optical fiber end face sphere 3. The multi-core optical fiber core 2 transmits an illumination beam into the optical fiber end face sphere 3, and the illumination beam is reflected by the reflective surface 4 on the optical fiber end face sphere 3 to the curved surface of the optical fiber end face sphere 3, and the curved surface of the optical fiber end face sphere 3 focuses the illumination beam to illuminate the observation area. The imaging beam reflected back from the observation area is focused and collected by the curved surface of the optical fiber end face sphere 3, and the collected imaging beam is reflected by the reflective surface 4, and the reflected imaging beam is transmitted to the multi-core optical fiber core 2 for transmission.
[0016] The specific structure of the multi-core optical fiber penetration imaging device is as follows: The fiber end face sphere 3 is directly obtained by melting the multi-core optical fiber, and the reflective surface 4 is made by grinding the fiber end face sphere 3 using grinding technology. The multi-core optical fiber core 2 is mainly used to transmit the illumination light source used for imaging and the scattered light reflected back after the observation area is illuminated by the illumination light source. The multi-core optical fiber can obtain more pixels, greatly improving the resolution of imaging.
[0017] The main functions of the fiber end surface sphere 3 are: (1) The illumination light transmitted in the core 2 of the multi-core optical fiber is focused on the curved surface of the sphere to fully illuminate the observation area and achieve high-resolution imaging.
[0018] (2) When the observation surface is illuminated by the illumination beam, scattered light will be emitted. The scattered light will be focused back to the multi-core optical fiber through the sphere 3 on the end face of the optical fiber for collection.
[0019] The main function of the reflection surface 4 is to reflect the illumination light beam to the optical fiber end surface sphere 3 for focusing and to reflect the imaging light beam collected by the optical fiber end surface sphere 3 back to the multi-core optical fiber core 2 for final imaging.
[0020] Furthermore, one end of the multi-core optical fiber is formed into a flat end face by a commercial optical fiber cutter; the flat optical fiber end face after cutting is wiped by anhydrous ethanol to keep the optical fiber end face clean; the processed optical fiber end face is placed at the electrode of a commercial arc welding machine; the optical fiber end face is melted by discharge heating by setting the parameters of the arc welding machine until the multi-core optical fiber end face is burned into a sphere; Furthermore, the optical fiber end surface sphere is ground on one side using an optical fiber grinder; The optical fiber end surface sphere is fixed to the grinding disc of the grinder, and the grinding disc forms an angle of 45° with the grinding paper; Set the speed of the fiber optic grinder to 150 RPM, and use 8000 mesh grinding paper to perform the first step of grinding the fiber sphere until a 45° reflection surface is polished on one side of the fiber end face sphere; The 45° reflective surface is gradually ground by 2000-mesh grinding paper, 1200-mesh grinding paper and 600-mesh grinding paper until the 45° reflective surface is ground smooth.
[0021] The specific manufacturing process of the multi-core optical fiber penetration imaging device includes the following steps: S1, using an arc welding machine to prepare an optical fiber end face sphere 3 at the end face of a multi-core optical fiber, specifically comprising: Cut one end of the multi-core optical fiber with a commercial optical fiber cutter to ensure that the end face of the multi-core optical fiber is cut flat and intact; Wipe the optical fiber end face with anhydrous ethanol to ensure that the optical fiber end face is clean; The optical fiber end face after the above treatment is placed in the electrode heating end of the arc welding machine, and the arc temperature of the arc discharge system is set to 3000°C, which is high enough to melt the multi-core optical fiber. During the melting process of the multi-core optical fiber, the surface tension will cause the multi-core optical fiber to form a sphere at the discharge point. In order to overcome the influence of gravity during the melting process of the optical fiber end face sphere to form a regular shaped sphere, the multi-core optical fiber needs to be rotated in the process of making the optical fiber end face sphere using only the arc welding machine. The multi-core optical fiber used is a 7-core optical fiber, and the diameter of the multi-core optical fiber cladding is 125μm; In this step, arc discharge is a prior art.
[0022] S2, grinding the optical fiber end surface sphere 3 by an optical fiber grinder until the optical fiber end surface sphere is ground out to have a 45° reflection surface 4, specifically comprising: Fix the optical fiber end surface sphere 3 to the grinding disc of the optical fiber grinding machine, and the grinding disc forms an angle of 45° with the grinding paper; The rotation speed of the grinding disc of the optical fiber grinder is set to 150 RPM, and the optical fiber end surface sphere 3 is gradually ground using 8000 mesh, 2000 mesh, 1200 mesh and 600 mesh grinding papers until a 45° flat and smooth surface is formed; The first step is to roughly grind the optical fiber end surface sphere 3 using 8000 mesh grinding paper until the sphere is ground to a 45° surface; The 45° surface is further polished by using 2000 mesh, 1200 mesh and 600 mesh grinding papers until the 45° surface is polished and bright.
[0023] The main principle of this step is to grind a reflective surface 4 on the optical fiber end surface sphere 3. The reflective surface 4 is prepared on the optical fiber end surface sphere 3 using an optical fiber grinder, which is a prior art. The specific preparation method is to use the rotation of the grinding disc to remove the excess part on the optical fiber end surface sphere 3. The fixing method, grinding method and program setting of the optical fiber end surface sphere can be set according to the operating experience of professional technicians, and finally a 45° reflective surface 4 is ground on the optical fiber end surface sphere 3.
[0024] In order to ensure that the reflective surface 4 is smooth and transparent, the optical fiber end face sphere 3 is first ground using 8000 mesh grinding paper to remove the excess part and grind out a 45° surface, and then the 45° surface is polished using 2000 mesh, 1200 mesh and 600 mesh grinding papers respectively until the 45° surface is smooth and flat, reducing the light loss caused by the reflection of the light beam at the reflective surface 4.
[0025] Optionally, in order to increase the reflectivity of the reflection surface 4 , a wide-band high-reflection film, including a dielectric film and a metal film, may be plated on the reflection surface 4 .
[0026] S3, the multi-core optical fiber core 2 transmits the illumination beam to the optical fiber end surface sphere 3, the illumination beam is reflected by the reflection surface 4 on the optical fiber end surface sphere 3 to the curved surface of the optical fiber end surface 3, and the curved surface of the optical fiber end surface sphere 3 focuses the illumination beam to illuminate the observation area; S4, the imaging light beam reflected back from the observation area is focused and collected by the curved surface of the sphere 3 at the end face of the optical fiber, the collected imaging light beam is reflected by the reflection surface 4, and the reflected imaging light beam is transmitted to the multi-core optical fiber core 2 for transmission; S5. The reflecting surface 4 is used to reflect the illumination light beam to the optical fiber end surface sphere 3 for focusing and to reflect the imaging light beam collected by the optical fiber end surface sphere 3 back to the multi-core optical fiber core 2 for final imaging.
[0027] This embodiment is mainly aimed at the needs of the fiber optic penetration imaging device to be small and flexible and to cope with the clear imaging of various complex environments, and designs a flexible multi-core fiber optic penetration imaging device with compact structure and high resolution. This device and this method propose a penetration imaging system based on a flexible multi-core optical fiber and directly preparing a fiber end face sphere and a reflector on the multi-core optical fiber. By directly preparing optical focusing and reflection elements on the end face of the multi-core optical fiber, the problems of non-compact structure and complex preparation process caused by installing or bonding conical lenses and reflectors on the optical fiber are avoided. The core component is the use of multi-core optical fiber. The use of multi-core optical fiber for fiber optic penetration imaging devices not only has the characteristics of optical fiber flexibility and can be used in various small and complex environments, but also compared with the traditional single-core optical fiber with only one pixel and low resolution, the multi-core optical fiber has more pixels due to its larger number of cores, which can effectively improve the resolution of the imaging image.
[0028] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.
Claims
1. A multi-core optical fiber penetration imaging method, characterized in that: A multi-core optical fiber penetration imaging device is used, the multi-core optical fiber penetration imaging device comprising a multi-core optical fiber cladding (1), a multi-core optical fiber core (2), an optical fiber end face sphere (3) and a reflection surface (4), the multi-core optical fiber cladding (1) is coated on the outside of the multi-core optical fiber core (2), the optical fiber end face sphere (3) is located at the end of the multi-core optical fiber, the optical fiber end face sphere (3) is directly formed by heating and melting one end of the multi-core optical fiber, the multi-core optical fiber comprises a multi-core optical fiber cladding (1) and a multi-core optical fiber core (2); the reflection surface (4) is an inclined surface formed by grinding the optical fiber end face sphere (3); The following steps are involved: S1, using an arc welding machine to prepare an optical fiber end face sphere (3) at the end face of a multi-core optical fiber; S2, grinding the optical fiber end surface sphere (3) by means of an optical fiber grinder until an inclined reflecting surface (4) is formed on the optical fiber end surface sphere; S3, the core of the multi-core optical fiber (2) transmits an illumination beam to the optical fiber end surface sphere (3), the illumination beam is reflected by the reflection surface (4) on the optical fiber end surface sphere (3) to the curved surface of the optical fiber end surface (3), and the curved surface of the optical fiber end surface sphere (3) focuses the illumination beam to illuminate the observation area; S4, the imaging light beam reflected back from the observation area is focused and collected by the curved surface of the sphere (3) at the end face of the optical fiber, the collected imaging light beam is reflected by the reflection surface (4), and the reflected imaging light beam is transmitted to the core (2) of the multi-core optical fiber for transmission; S5, the reflecting surface (4) is used to reflect the illumination light beam to the curved surface of the optical fiber end surface sphere (3) for focusing and to reflect the imaging light beam collected by the optical fiber end surface sphere (3) back to the multi-core optical fiber core (2) for final imaging.
2. The multi-core optical fiber penetration imaging method according to claim 1, characterized in that: In step S1, one end of the multi-core optical fiber is cut by a commercial optical fiber cutter to ensure that the end face of the multi-core optical fiber is cut flat and intact; the optical fiber end face is wiped with anhydrous ethanol to ensure that the optical fiber end face is clean.
3. The multi-core optical fiber penetration imaging method according to claim 2, characterized in that: The processed optical fiber end face is placed in the electrode heating end of the arc welding machine, and the arc temperature of the arc discharge system is set to 3000℃, which is enough to melt the multi-core optical fiber; during the melting process of the multi-core optical fiber, due to the effect of surface tension, the multi-core optical fiber will form a sphere on the optical fiber end face at the discharge point.
4. The multi-core optical fiber penetration imaging method according to claim 3, characterized in that: In order to overcome the influence of gravity during the fusion process of the optical fiber end face sphere and thus obtain a regular shaped sphere, the multi-core optical fiber needs to be rotated during the process of making the optical fiber end face sphere using only an arc fusion machine.
5. The multi-core optical fiber penetration imaging method according to claim 1, characterized in that: In step S2, the optical fiber end surface sphere (3) is fixed to a grinding disc of an optical fiber grinding machine, with the grinding disc and the grinding paper forming an angle of 45°.
6. The multi-core optical fiber penetration imaging method according to claim 5, characterized in that: The rotation speed of the grinding disc of the optical fiber grinder is set to 150 RPM, and the optical fiber end surface sphere (3) is gradually ground using 8000 mesh, 2000 mesh, 1200 mesh and 600 mesh grinding papers until a 45° flat and smooth surface is formed.
7. The multi-core optical fiber penetration imaging method according to claim 6, characterized in that: The first step is to roughly grind the optical fiber end face sphere (3) using 8000 mesh grinding paper until a 45° surface is ground out of the sphere; the 45° surface is further polished using 2000 mesh, 1200 mesh and 600 mesh grinding papers until the 45° surface is polished and bright.
8. The multi-core optical fiber penetration imaging method according to claim 7, characterized in that: In order to increase the reflectivity of the reflection surface (4), a wide-band high-reflection film is plated on the reflection surface (4), and the wide-band high-reflection film includes a dielectric film and a metal film.
9. A multi-core optical fiber penetration imaging device, characterized in that: The invention comprises a multi-core optical fiber cladding (1), a multi-core optical fiber core (2), an optical fiber end face sphere (3) and a reflection surface (4); the multi-core optical fiber cladding (1) is coated on the outside of the multi-core optical fiber core (2); the optical fiber end face sphere (3) is located at the end of the multi-core optical fiber; the optical fiber end face sphere (3) is directly formed by heating and melting one end of the multi-core optical fiber; the multi-core optical fiber comprises the multi-core optical fiber cladding (1) and the multi-core optical fiber core (2); and the reflection surface (4) is an inclined surface formed by grinding the optical fiber end face sphere (3).
10. The multi-core optical fiber penetration imaging device according to claim 1, characterized in that: The reflecting surface (4) is a 45° inclined surface.
11. The multi-core optical fiber penetration imaging device according to claim 1, characterized in that: The multi-core optical fiber is a 7-core optical fiber with 7 cores and a cladding diameter of 125 μm.