CN108287392B - Tapered optical fiber image inverter and preparation method thereof - Google Patents
Tapered optical fiber image inverter and preparation method thereof Download PDFInfo
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- CN108287392B CN108287392B CN201810189327.6A CN201810189327A CN108287392B CN 108287392 B CN108287392 B CN 108287392B CN 201810189327 A CN201810189327 A CN 201810189327A CN 108287392 B CN108287392 B CN 108287392B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
- G02B6/06—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres the relative position of the fibres being the same at both ends, e.g. for transporting images
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Abstract
The invention discloses a conical optical fiber image reverser and a preparation method thereof, wherein the conical optical fiber image reverser comprises an optical fiber zooming part and an optical fiber image reversing torsion part, the optical fiber zooming part and the optical fiber image reversing torsion part are integrally formed, and the optical fiber zooming part is used for collimating input light according to a preset proportion, so that the collimated light enters the optical fiber image reversing torsion part at an angle smaller than the aperture angle of the optical fiber image reversing torsion part; the optical fiber reverse image torsion part is used for biasing the position of the collimated light rays according to a preset angle of 180 degrees. The invention simultaneously realizes the functions of scaling and image inversion through the structure consisting of the optical fiber scaling part and the optical fiber image inversion torsion part, combines the scaling function and the image inversion function into a whole, solves the problem of light leakage through the collimation effect of the optical fiber scaling part on the input light, and improves the contrast ratio, the transmittance and the resolution of the product. The invention can be widely applied to the field of optical fiber image transmission elements.
Description
Technical Field
The invention relates to the field of optical fiber image transmission elements, in particular to a conical optical fiber image inverter and a preparation method thereof.
Background
The optical fiber image transmission element is an optical element formed by fusing a plurality of optical fibers according to a certain rule, and can transmit images from one end face to the other end face according to the established rule. The series products of optical fiber panel, optical fiber image inverter, optical fiber light cone, optical fiber image transmission beam, etc. are typical representative of optical fiber image transmission elements. The products have wide application in the fields of low-light night vision, medical treatment, display, detection, biological identification and the like.
As shown in fig. 1, the optical fiber image inverter 2 is manufactured by reheating and twisting the optical fiber panel 1, and the product can invert the transmitted image by 180 degrees and output the inverted image. The internal fiber structure of the fiber inverter 2 is shown in fig. 2, and includes a peripheral fiber 3 and a central fiber 4. Because the optical fiber image inverter has the advantages of small volume, light weight and the like, in the low-light night vision image intensifier, the optical fiber image inverter is generally adopted to solve the problem of image inversion of a front-end imaging system, as shown in fig. 3, wherein 5 is a micro-channel plate, 6 is an optical fiber panel, and 7 is a fluorescent screen. As shown in fig. 3, the optical fiber image inverter 2 inverts the enhanced image by 180 ° and transmits the image to the output end without distortion so as to conform to the observation habit of people.
The fiber light cone is manufactured by reheating and stretching on the basis of the fiber panel, and the product can output the transferred image in a scaling way. The internal fiber structure of the fiber taper is shown in fig. 4, and includes a peripheral fiber 3 and a central fiber 4. Compared with a lens image scaling system, the optical system adopting the fiber light cone has the advantages of small volume, no distortion, high coupling efficiency and the like, and is generally applied to occasions needing scaling coupling of images, such as digital low-light-level image intensifiers. The role of the fiber light cone in the digitized microimage intensifier is to scaledly couple the intensified image into the CCD image sensor.
The contrast, resolution, distortion and other technical indexes of the output image of the low-light night vision image intensifier are closely related to the performance of the optical fiber image inverter, so the optical fiber image inverter is one of key elements of the low-light night vision device. In order to further improve the performance of low-light night vision image intensifier, higher requirements are put on the contrast, resolution and transmittance of the optical fiber image inverter, wherein the requirement for high contrast improvement is most urgent.
The manufacturing method of the existing optical fiber image inverter comprises the following steps: and (3) reheating the middle section of the manufactured blank rod, twisting the blank rod by 180 degrees around the central axis of the blank rod, and performing optical cold processing. The optical fiber image inverter manufactured by the technology is characterized in that other optical fibers except the optical fiber at the center are stretched into biconical optical fibers in the twisting process, and the stretching degree is in direct proportion to the turning radius of the biconical optical fibers. That is, the optical fiber image inverter in the prior art is composed of countless biconical optical fibers twisted around an axis, wherein the taper of the biconical optical fibers changes with the radius.
The tapered fiber has a law that the numerical aperture of the large end is small and the numerical aperture of the small end is large, and the size of the tapered fiber meets the relation of d 1sinθ1＝d2sinθ2, as shown in fig. 5. Whereas the theoretical numerical aperture of the fiber inverter is typically 1 or more, θ 2 is about 90 °. Taking the diameter of 16mm as an example, the diameter of the smallest part of the twisted biconical optical fiber is only 1/3 of the diameter of the two ends, and the aperture angle theta 1 of the large end can be calculated to be only 19.47 degrees. It can be seen that most of the diffuse light emitted from the phosphor screen exceeds the aperture angle, and this part of the light is inputted into the biconical optical fiber of the optical fiber inverter, and when transmitted to the tapered region with gradually smaller diameter, it cannot meet the total reflection condition due to the smaller aperture angle and will be emitted from the side surface, thereby becoming cross-talk light between the optical fibers, and reducing the contrast of the product, as shown in fig. 6.
The microstructure of the optical fiber image inverter is formed by compounding three materials of a fiber core 11, a fiber sheath 8 and a stray light absorbing glass 9, as shown in fig. 7. The prior art generally adopts a method for increasing the quantity of the stray light absorbing glass or enhancing the absorbing effect thereof to improve the contrast ratio of the product. However, the method can simultaneously bring the defects of reduced overall transmittance of the product, increased difference between the center and the edge, reduced edge resolution and the like, and the three index requirements of contrast, transmittance and resolution are difficult to be simultaneously considered.
Disclosure of Invention
In order to solve the technical problems, the invention aims to: the tapered optical fiber image inverter with high contrast, high transmittance and high resolution and the preparation method thereof are provided.
The first technical scheme adopted by the invention is as follows:
The conical optical fiber image reverser comprises an optical fiber zooming part and an optical fiber image reversing torsion part, wherein the optical fiber zooming part and the optical fiber image reversing torsion part are integrally formed, and the optical fiber zooming part is used for collimating input light according to a preset proportion, so that the collimated light enters the optical fiber image reversing torsion part at an angle smaller than the aperture angle of the optical fiber image reversing torsion part; the optical fiber reverse image torsion part is used for biasing the position of the collimated light rays according to a preset angle of 180 degrees, so that the output of the input image after 180 degrees of reverse rotation is realized.
Further, the fiber scale portion is a fiber light cone.
Further, the optical fiber reverse image torsion part is an optical fiber reverse image device.
The second technical scheme adopted by the invention is as follows:
the preparation method of the tapered optical fiber image inverter comprises the following steps:
preparing a blank of a conical optical fiber image reverser, wherein the blank of the conical optical fiber image reverser comprises a blank groove and two end surfaces of the blank, and the two ends of the blank groove are respectively connected with the two end surfaces of the blank;
Stretching the blank groove by applying corresponding tensile force to the two end surfaces of the blank to obtain a stretched blank, wherein the stretched blank is a blank containing the shape of the optical fiber zooming part and meets the requirement of the magnification ratio of the tapered optical fiber image inverter;
Twisting the stretched blank groove by applying corresponding twisting force to the two end faces of the blank in sequence to obtain a twisted blank, wherein the twisted blank is a blank simultaneously comprising an optical fiber zooming part shape and an optical fiber reverse image twisting part shape;
Cutting the twisted blank to obtain a cut conical optical fiber image inverter blank;
And carrying out subsequent processing on the cut conical optical fiber image reverser blank to obtain the conical optical fiber image reverser.
Further, the step of preparing a blank of the tapered optical fiber image inverter specifically comprises the following steps:
and manufacturing blanks with corresponding sizes according to the size requirement of the conical optical fiber image inverter, wherein two end faces of each blank are hexagonal heads.
Further, the step of stretching the blank groove by applying corresponding tensile force to the two end surfaces of the blank to obtain a stretched blank specifically comprises the following steps:
connecting two end faces of the blank with torsion stretching equipment;
Heating a heating wire of a heating furnace aiming at the central position of the blank groove to heat and soften the central position of the blank groove;
according to the enlargement and reduction ratio of the conical optical fiber image reverser, the torsion stretching equipment applies corresponding pulling force to stretch the blank groove through the two end surfaces of the blank, so that the stretched blank is in the shape of an optical fiber zoom part.
Further, the step of twisting the stretched blank groove by applying corresponding twisting forces to the two end surfaces of the blank to obtain a twisted blank specifically comprises the following steps:
connecting the two end surfaces of the stretched blank with torsion stretching equipment;
heating a heating wire of a heating furnace in alignment with a first position of a stretched blank groove to heat and soften the first position of the blank groove, wherein the first position of the blank groove is positioned between the central position of the blank groove and one end face of the blank;
the torsion stretching equipment applies corresponding torsion force to twist the first position of the blank groove through the two end surfaces of the blank, so that the two sides of the first position of the blank groove are twisted into the shape of an optical fiber reverse-image twisting part;
heating a heating wire of a heating furnace in alignment with a second position of the stretched blank groove to heat and soften the second position of the blank groove, wherein the second position of the blank groove is positioned between the central position of the blank groove and the other end face of the blank;
The torsion stretching equipment applies corresponding torsion force to twist the second position of the blank groove through the two end surfaces of the blank, so that the two sides of the second position of the blank groove are twisted into the shape of the optical fiber inverted torsion part.
Further, the step of cutting the twisted blank to obtain a cut tapered optical fiber image inverter blank specifically includes:
Cutting the twisted blank groove at the center position by using cutting equipment, so as to obtain 2 conical optical fiber image reverser blanks;
Milling and measuring the blank of the tapered optical fiber image reverser according to the requirement of the magnification and reduction of the tapered optical fiber image reverser.
Further, the step of performing subsequent processing on the cut tapered optical fiber image reverser blank to obtain a tapered optical fiber image reverser comprises the following specific steps:
And processing the cut conical optical fiber image reverser blank into a finished product with a corresponding shape according to the external dimension requirement of the conical optical fiber image reverser, and carrying out fine grinding and polishing on two end surfaces of the blank to finally form the conical optical fiber image reverser.
The third technical scheme adopted by the invention is as follows:
the preparation method of the tapered optical fiber image inverter comprises the following steps:
preparing a blank of a conical optical fiber image reverser, wherein the blank of the conical optical fiber image reverser comprises a blank groove and two end surfaces of the blank, and the two ends of the blank groove are respectively connected with the two end surfaces of the blank;
the blank groove is twisted by applying corresponding pulling force to the two end faces of the blank, so that a twisted blank is obtained, and the twisted blank is a blank containing the shape of the optical fiber reverse-image twisting part;
stretching the twisted blank groove by applying corresponding torsion force to the two end surfaces of the blank in sequence to obtain a stretched blank, wherein the stretched blank simultaneously comprises an optical fiber zooming part shape and an optical fiber reverse image twisting part shape, and the optical fiber zooming part shape meets the requirement of the magnification-reduction ratio of a conical optical fiber reverse image device;
cutting the stretched blank to obtain a cut conical optical fiber image inverter blank;
And carrying out subsequent processing on the cut conical optical fiber image reverser blank to obtain the conical optical fiber image reverser.
The beneficial effects of the invention are as follows: the invention discloses a tapered optical fiber image reverser and a preparation method thereof, which simultaneously realize the functions of scaling and image reversing through a structure consisting of an optical fiber scaling part and an optical fiber image reversing torsion part, integrate the scaling function and the image reversing function into one, enable the collimated light to enter the optical fiber image reversing torsion part at an angle smaller than the aperture angle of the optical fiber image reversing torsion part through the collimation effect of the optical fiber scaling part, solve the problem of leakage of the light in the middle part of the traditional optical fiber image reverser, and improve the contrast ratio, the transmittance and the resolution of products by a method of increasing the quantity of parasitic light absorbing glass and enhancing the absorption effect of the parasitic light absorbing glass.
Drawings
FIG. 1 is a schematic diagram of a conventional optical fiber inverter;
FIG. 2 is a schematic diagram of an internal optical fiber structure of a conventional optical fiber inverter;
FIG. 3 is a schematic diagram of an application structure of a conventional optical fiber image inverter in a low-light night vision image intensifier;
FIG. 4 is a schematic diagram of the internal fiber structure of a prior art fiber cone;
FIG. 5 is a graph of the angular relationship between light incidence and light exit in a prior art tapered fiber;
FIG. 6 is a schematic diagram of an optical fiber path of a conventional optical fiber inverter;
FIG. 7 is a schematic diagram of an arrangement structure of internal optical fibers of a conventional optical fiber inverter;
FIG. 8 is a schematic diagram of an embodiment of a tapered fiber optic inverter of the present invention;
FIG. 9 is a schematic diagram of the optical fiber path of the tapered fiber optic inverter of the present invention;
FIG. 10 is a schematic view of the fiber optic path principle of the tapered fiber optic inverter of the present invention;
FIG. 11 is a schematic illustration of a blank structure used in the method of making a tapered fiber optic inverter of the present invention;
FIG. 12 is a schematic view of the stretched structure of the blank of FIG. 11;
FIG. 13 is a schematic view of the blank of FIG. 12 after twisting;
fig. 14 is a schematic view of the cut blank of fig. 13.
Detailed Description
The invention is further explained and illustrated below with reference to the drawing and the specific embodiments of the present specification.
Referring to fig. 8, a tapered optical fiber inverter includes an optical fiber scaling portion 12 and an optical fiber inverting torsion portion, the optical fiber scaling portion and the optical fiber inverting torsion portion being integrally formed, the optical fiber scaling portion 12 being configured to collimate an input light ray in a preset ratio such that the collimated light ray is incident to the optical fiber inverting torsion portion at an angle smaller than an aperture angle of the optical fiber inverting torsion portion; the optical fiber reverse image torsion part is used for biasing the position of the collimated light rays according to a preset angle of 180 degrees, so that the output of the input image after 180 degrees of reverse rotation is realized.
Collimation refers to scaling an input image according to a preset proportion. The optical fiber zooming part of the invention collimates the input light according to a preset proportion (can be selected or set in advance according to actual needs), so that the collimated light in a preset radius is incident to the optical fiber inverted image torsion part at an angle smaller than the aperture angle of the optical fiber inverted image torsion part, thus the light in the preset radius can be output after the total reflection transmission without leakage in the optical fiber inverted image torsion part, the problem of leakage of the light in the middle of the biconical optical fiber of the traditional optical fiber inverted image device is solved, and the light crosstalk between the optical fibers is avoided.
In fig. 8, the optical fiber zooming part 12 of the tapered optical fiber image inverter has a truncated cone structure with an image zooming function, and comprises two upper and lower end surfaces with different sizes, and the optical fiber image inverting torsion part is positioned at the large end of the optical fiber zooming part. The optical fiber reverse image twisting part can be further divided into 2 parts, namely a first optical fiber reverse image twisting part 131 and a second optical fiber reverse image twisting part 132, wherein the 2 parts can be formed by twisting the optical fiber panel by 180 degrees around a central axis after heating, and can be realized by adopting a truncated cone structure (namely a truncated cone formed by the first optical fiber reverse image twisting part 131 and the second optical fiber reverse image twisting part 132) shown in fig. 8. As can be seen from fig. 8, the letter a image input from the fiber scale section 12 is scaled up and inverted 180 degrees in sequence to form a scaled up and inverted 180 degree letter a output.
Those skilled in the art will appreciate that the fiber optic zoom portion 12 of the present invention may be not just the truncated cone structure shown in FIG. 8, but may be a fiber optic cone structure as shown in FIG. 4 or any other structure having an image zoom function. Similarly, the optical fiber reverse image twisting part of the present invention may be a truncated cone structure as shown in fig. 8, a cylindrical structure (i.e. the first optical fiber reverse image twisting part 131 and the second optical fiber reverse image twisting part 132 form a cylinder) as shown in fig. 1, or any other structure with a reverse image function.
Further as a preferred embodiment, the fiber-scaled portion is a fiber cone.
Further as a preferred embodiment, the optical fiber reverse image twisting part is an optical fiber reverse image device.
As shown in FIG. 8, the tapered optical fiber image inverter combines the characteristics of the optical fiber image inverter and the taper light cone, and has the functions of inverting and magnifying and reducing images. In addition, the invention skillfully utilizes the collimation effect of the optical fiber zoom part on the light, and effectively solves the limitations of insufficient contrast and improved performance in the existing optical fiber image inverter technology.
An optical fiber path of the tapered optical fiber inverter of the present invention may employ a structure as shown in fig. 9. In fig. 9, the tapered optical fiber inverter is a three-tapered optical fiber in which all the other optical fibers except the optical fiber at the center are bent, that is, the optical fiber scaling section 12, the first optical fiber reverse twist section 131, and the second optical fiber reverse twist section 132 are all tapered optical fibers. To simplify the optical path analysis, the curved tri-cone optical fiber at the circumferential position of 16mm in diameter of the tapered fiber inverter of fig. 10 can be straightened into the optical path schematic of the tri-cone optical fiber of fig. 10. In fig. 10, D1 is the single fiber diameter of the input end of the tapered fiber inverter (i.e., the small end diameter of the fiber scaling portion 12 of fig. 8 may also be simply referred to as the small end diameter of 1 taper), D2 is the single fiber diameter of the output end (i.e., the large end diameter of the second fiber inverting torsion portion 132 of fig. 8 may also be simply referred to as the large end diameter of 3 taper), D2 is the minimum diameter of the middle section of the biconical fiber (i.e., the small end diameter of the first fiber inverting torsion portion 131 or the second fiber inverting torsion portion 132 of fig. 8 may also be simply referred to as the small end diameter of 2 taper or 3 taper), and D2 decreases in size as the torsion radius increases, d2=d2 at the axial center. For example, when d2=6 micrometers, D2 is about 2 micrometers at a diameter Φ16mm. D1 is the maximum diameter of the optical fiber between D1 and D2 (i.e., the large end diameter of the fiber scaling section 12 or the first fiber reverse twist section 131 of fig. 8, which may also be simply referred to as 1 taper or 2 taper), and d1.ltoreq.d2 is theorized.
As shown in FIG. 10, when light with an incidence angle smaller than the aperture angle of the small end face of 1 cone enters the optical fiber from the small end face of 1 cone, the 1 cone collimates the incident light, when D1/D1 is larger than or equal to D1/D2, the collimated light is incident into the 2 cones at an angle smaller than the aperture angle of the large end face of 2 cones, so that the light within the diameter phi 16mm of the output end of the conical optical fiber image inverter can realize leak-free total reflection propagation in the 2 cones and enter the 3 cones, and then is biased by the 3 cones and output. The structures of fig. 9 and 10 effectively solve the problem of light leakage in the optical fiber image inverter in the prior art, thereby having obvious improvement effect on improving the contrast and transmittance of the optical fiber image inverter. Because 1 awl does not change along with torsion angle, therefore the optic fibre (except central optic fibre) in the toper optic fibre image inverter of fig. 9 and 10 is the toper optic fibre, and this structure has the collimation effect to light for the light can assemble the back output, is favorable to promoting the luminance that the people's eye observed.
The invention discloses a preparation method of a tapered optical fiber image inverter shown in fig. 8, which comprises the following steps:
preparing a blank of a conical optical fiber image reverser, wherein the blank of the conical optical fiber image reverser comprises a blank groove and two end surfaces of the blank, and the two ends of the blank groove are respectively connected with the two end surfaces of the blank;
Stretching the blank groove by applying corresponding tensile force to the two end surfaces of the blank to obtain a stretched blank, wherein the stretched blank is a blank containing the shape of the optical fiber zooming part and meets the requirement of the magnification ratio of the tapered optical fiber image inverter;
Twisting the stretched blank groove by applying corresponding twisting force to the two end faces of the blank in sequence to obtain a twisted blank, wherein the twisted blank is a blank simultaneously comprising an optical fiber zooming part shape and an optical fiber reverse image twisting part shape;
Cutting the twisted blank to obtain a cut conical optical fiber image inverter blank;
And carrying out subsequent processing on the cut conical optical fiber image reverser blank to obtain the conical optical fiber image reverser.
Further as a preferred embodiment, the step of preparing a blank of the tapered optical fiber inverter specifically comprises the following steps:
and manufacturing blanks with corresponding sizes according to the size requirement of the conical optical fiber image inverter, wherein two end faces of each blank are hexagonal heads.
As shown in fig. 11, the blank has hexagonal ends 17 for applying torsion and tension. The blank groove is used for twisting and stretching, so that the conical optical fiber image inverter can realize the functions of 180-degree image inversion, amplification and reduction. As shown in fig. 11, the blank slot contains 3 positions that may be used for subsequent stretching and rotation operations: a first position 14, a central position 15 and a second position 16.
Further as a preferred embodiment, the step of stretching the blank groove by applying corresponding tensile force to the two end surfaces of the blank to obtain a stretched blank specifically includes:
connecting two end faces of the blank with torsion stretching equipment;
Heating a heating wire of a heating furnace aiming at the central position of the blank groove to heat and soften the central position of the blank groove;
according to the enlargement and reduction ratio of the conical optical fiber image reverser, the torsion stretching equipment applies corresponding pulling force to stretch the blank groove through the two end surfaces of the blank, so that the stretched blank is in the shape of an optical fiber zoom part.
The stretching process of the invention comprises the following steps: connecting two end faces of a blank with torsion stretching equipment, aligning heating wires of a heating furnace with the central position 15 of a blank groove, heating to enable the temperature to be higher than the softening temperature of the blank, applying tension after the central position 15 of the blank groove is softened, and stretching the corresponding length of the blank groove according to the enlarging and reducing ratio of a conical optical fiber image reverser to enable the blank to form an optical fiber zoom part (such as a biconical shape and the like). The stretching process mainly realizes the enlarging and reducing functions of the tapered optical fiber image inverter, so that the blank forms a blank with the shape of the scaled part of the optical fiber (such as a biconic shape and the like) as shown in fig. 12.
Further as a preferred embodiment, the step of twisting the stretched blank groove by sequentially applying corresponding twisting forces to the two end surfaces of the blank to obtain a twisted blank specifically includes:
connecting the two end surfaces of the stretched blank with torsion stretching equipment;
heating a heating wire of a heating furnace in alignment with a first position of a stretched blank groove to heat and soften the first position of the blank groove, wherein the first position of the blank groove is positioned between the central position of the blank groove and one end face of the blank;
the torsion stretching equipment applies corresponding torsion force to twist the first position of the blank groove through the two end surfaces of the blank, so that the two sides of the first position of the blank groove are twisted into the shape of an optical fiber reverse-image twisting part;
heating a heating wire of a heating furnace in alignment with a second position of the stretched blank groove to heat and soften the second position of the blank groove, wherein the second position of the blank groove is positioned between the central position of the blank groove and the other end face of the blank;
The torsion stretching equipment applies corresponding torsion force to twist the second position of the blank groove through the two end surfaces of the blank, so that the two sides of the second position of the blank groove are twisted into the shape of the optical fiber inverted torsion part.
The torsion process of the invention is as follows: after the stretching is completed, the heating furnace starts to cool until the central position 15 of the blank groove is cooled to below the softening temperature; then, aligning a heating wire of a heating furnace to a first position 14 of a blank groove, heating to a temperature higher than the softening temperature of the blank, heating and softening the part of the first position 14 of the blank groove, applying torsion force to hexagonal heads at two ends of the blank, and stopping torsion after the hexagonal heads are twisted by 180 degrees; then starting to cool down to cool the blank to a temperature at which the blank is no longer softened; and finally, moving the position of the heating furnace to enable the heating wire of the heating furnace to be aligned with the second position 16 of the blank groove, twisting the second position 16 by 180 degrees by the same method, and naturally cooling the blank after the completion. The torsion process is used for realizing the image inverting function of the tapered optical fiber image inverter. As shown in FIG. 13, the optical fiber in the torsion area can be made into a biconical optical fiber, and the small end surface of the optical fiber connected in a reverse image can form a tri-conical optical fiber structure together with the drawn conical optical fiber.
In fig. 13, the middle part of the blank is heated first, and after it is softened, it is twisted 180 degrees again, just like twist. Therefore, except for the central optical fiber, the softened part in the middle of the rest optical fibers needs to be stretched and deformed into a biconical optical fiber, so that the biconical optical fiber can be twisted by 180 degrees around the central axis, and the stretching and deformation degree is in direct proportion to the distance from the central axis of the central axis.
Further as a preferred embodiment, the step of cutting the twisted blank to obtain a cut tapered optical fiber inverter blank specifically includes:
Cutting the twisted blank groove at the center position by using cutting equipment, so as to obtain 2 conical optical fiber image reverser blanks;
Milling and measuring the blank of the tapered optical fiber image reverser according to the requirement of the magnification and reduction of the tapered optical fiber image reverser.
The cutting process of the invention specifically comprises the following steps: after the temperature of the blank is reduced to room temperature, the blank after the drawing and torsion in fig. 13 is taken off from the drawing and torsion device, then the blank is cut into two parts at the center position of a blank groove by using a cutting device to form 2 conical optical fiber image reverser blanks shown in fig. 14, and milling and measuring are carried out according to the requirement of enlarging and reducing, so that the enlarging and reducing ratio corresponding to the conical optical fiber image reverser is achieved.
Further as a preferred embodiment, the step of performing subsequent processing on the cut tapered optical fiber image inverter blank to obtain a tapered optical fiber image inverter specifically includes:
And processing the cut conical optical fiber image reverser blank into a finished product with a corresponding shape according to the external dimension requirement of the conical optical fiber image reverser, and carrying out fine grinding and polishing on two end surfaces of the blank to finally form the conical optical fiber image reverser.
The sequence of the two processes of stretching and twisting in the manufacturing process flow of the tapered optical fiber image reverser can be exchanged, the manufacturing result of the tapered optical fiber image reverser is not affected, and the external dimension of the tapered optical fiber image reverser is not limited to the shape mentioned by the invention.
The invention discloses a preparation method of a tapered optical fiber image inverter shown in fig. 8, which comprises the following steps:
preparing a blank of a conical optical fiber image reverser, wherein the blank of the conical optical fiber image reverser comprises a blank groove and two end surfaces of the blank, and the two ends of the blank groove are respectively connected with the two end surfaces of the blank;
the blank groove is twisted by applying corresponding pulling force to the two end faces of the blank, so that a twisted blank is obtained, and the twisted blank is a blank containing the shape of the optical fiber reverse-image twisting part;
stretching the twisted blank groove by applying corresponding torsion force to the two end surfaces of the blank in sequence to obtain a stretched blank, wherein the stretched blank simultaneously comprises an optical fiber zooming part shape and an optical fiber reverse image twisting part shape, and the optical fiber zooming part shape meets the requirement of the magnification-reduction ratio of a conical optical fiber reverse image device;
cutting the stretched blank to obtain a cut conical optical fiber image inverter blank;
And carrying out subsequent processing on the cut conical optical fiber image reverser blank to obtain the conical optical fiber image reverser.
When the tapered optical fiber image inverter is prepared, the tapered optical fiber image inverter can be twisted and then stretched, the finally prepared tapered optical fiber image inverter is not affected, and a user can flexibly select according to actual needs.
As shown in fig. 8 and fig. 11-14, taking a process of first stretching and then twisting as an example, the specific preparation flow of the tapered optical fiber image inverter of this specific embodiment is as follows:
(1) Manufacturing an optical fiber panel blank: and manufacturing blanks with corresponding sizes according to the size requirement of the tapered optical fiber image inverter according to the manufacturing process of the optical fiber panel. The groove diameter of the blank groove of the embodiment is 23+/-1 mm, and the groove width is 50+/-1 mm; the thickness of the hexagonal heads at the two end surfaces is 6mm, and the hexagonal heads are used for stretching and torsion stress.
(2) Stretching and torsion: connecting two end faces of a blank with stretching and twisting equipment, aligning a heating wire of a heating furnace with the central position 15 of a blank groove, heating for 50-70min, heating to 750-800 ℃ to soften the central position 15 of the blank groove, then applying 20-30kg of pulling force to stretch the blank groove for 20mm to form a fiber scaled part shape (such as a biconical shape) of the blank, and cooling the heating furnace to 550-600 ℃ after stretching is finished to recover the blank into a hard state; then moving the position of the heating furnace to lead the heating wire of the heating furnace to be aligned with the first position 14 of the blank groove, raising the temperature to 750-800 ℃ again to heat and soften the first position 14 of the blank groove, applying a torsion moment of 5-10N.m on the hexagonal heads of the two end surfaces of the blank to lead the hexagonal heads to twist 180 degrees, stopping twisting, and reducing the temperature to 550-600 ℃ to lead the blank to recover a hard state; then moving the position of the heating furnace to align the heating wire of the heating furnace with the second position 16 of the blank groove, heating to 750-800 ℃ to heat and soften the part of the second position 16 of the blank groove, then applying a torsion moment of 5-10N.m to twist the blank groove by 180 degrees, stopping twisting, and finally naturally cooling the blank.
(3) Cutting: after the temperature of the blank is reduced to room temperature, the stretched and twisted blank is taken off from the stretching and twisting equipment, then the blank is cut at the center position 15 of a blank groove by using cutting equipment so as to be cut into two parts to form 2 conical optical fiber image inverter blanks, and finally milling and measuring are carried out according to the requirement of enlarging and reducing, so that the enlarging and reducing ratio of the blank reaches 2 times.
(4) And (5) subsequent processing: and carrying out appearance processing on the cut conical optical fiber image reverser blank, controlling the outer diameter of a large end face to be 21.8+/-0.1 mm, controlling the outer diameter of a small end face to be 10.9+/-0.1 mm, controlling the height to be 26+/-0.1 mm, and carrying out fine grinding polishing on two end faces of the conical optical fiber image reverser blank to form the final conical optical fiber image reverser.
To better illustrate the effect of the tapered fiber inverter of the present invention, the present invention devised a corresponding comparative test, the results of which are shown in Table 1 below:
TABLE 1
As can be seen from table 1, the tapered optical fiber image inverter of the present invention can improve the resolution of the low-light night vision image intensifier.
In summary, the tapered optical fiber image inverter of the present invention combines the scaling function and the image inverting function into one through the structure composed of the optical fiber scaling part and the optical fiber image inverting torsion part, and solves the problem of light leakage in the middle of the optical fiber of the existing optical fiber image inverter through the collimation of the input light by the optical fiber scaling part, and has the following advantages:
a. the optical fiber structure of the tapered optical fiber image inverter determines that the optical crosstalk of the tapered optical fiber image inverter is smaller than that of a common image inverter.
B. the light receiving angle of the input end of the tapered optical fiber image inverter is larger, the light divergence angle of the output end is small, the light energy is more concentrated, and the visual brightness is higher.
C. the high resolution, the small fiber diameter of the input end of the tapered optical fiber image inverter and the high resolution.
D. the light weight, the volume of the tapered optical fiber image inverter with the same height is reduced by 1/2 compared with that of a common image inverter.
E. The center of gravity of the tapered optical fiber image inverter shifts to the output end, thereby being more beneficial to head-wearing application.
F. The cost of the matched element is reduced, the area of the micro-channel plate MCP and other elements matched with the tapered optical fiber image inverter can be reduced by more than 1/2, and the cost of the image intensifier is reduced.
G. The image tube energy consumption is reduced, the same image output area is realized, and the cathode area, the anode area and the working volume of a high-voltage part of the image tube adopting the tapered optical fiber image inverter are reduced by more than 1/2, so that the image tube energy consumption is reduced.
H. The longer duration adopts the toper optic fibre image inverter under the circumstances that does not change the overall dimension of photo tube, and the space that reduces can be used to increase battery volume from increasing battery capacity, and the photo tube energy consumption is low, and battery capacity is big, can increase duration.
I. the cost performance of the image tube is improved, and the cost of the image tube and the performance of the image tube can be reduced by adopting the tapered optical fiber image inverter.
While the preferred embodiment of the present application has been described in detail, the present application is not limited to the embodiments described above, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present application, and these equivalent modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.
Claims (10)
1. A tapered optical fiber image inverter is characterized in that: the optical fiber device comprises an optical fiber zooming part and an optical fiber inverted image torsion part, wherein the optical fiber zooming part and the optical fiber inverted image torsion part are integrally formed, and the optical fiber zooming part is used for collimating input light according to a preset proportion, so that the collimated light enters the optical fiber inverted image torsion part at an angle smaller than the aperture angle of the optical fiber inverted image torsion part; the optical fiber reverse image torsion part is used for biasing the position of the collimated light rays according to a preset angle of 180 degrees, so that the output of the input image after 180 degrees of reverse rotation is realized.
2. A tapered optical fiber inverter as defined in claim 1, wherein: the fiber optic zoom portion is a fiber optic cone.
3. A tapered optical fiber inverter as defined in claim 1, wherein: the optical fiber reverse image torsion part is an optical fiber reverse image device.
4. A preparation method of a tapered optical fiber image inverter is characterized by comprising the following steps: the method comprises the following steps:
preparing a blank of a conical optical fiber image reverser, wherein the blank of the conical optical fiber image reverser comprises a blank groove and two end surfaces of the blank, and the two ends of the blank groove are respectively connected with the two end surfaces of the blank;
Stretching the blank groove by applying corresponding tensile force to the two end surfaces of the blank to obtain a stretched blank, wherein the stretched blank is a blank containing the shape of the optical fiber zooming part and meets the requirement of the magnification ratio of the tapered optical fiber image inverter;
Twisting the stretched blank groove by applying corresponding twisting force to the two end faces of the blank in sequence to obtain a twisted blank, wherein the twisted blank is a blank simultaneously comprising an optical fiber zooming part shape and an optical fiber reverse image twisting part shape;
Cutting the twisted blank to obtain a cut conical optical fiber image inverter blank;
and carrying out subsequent processing on the cut conical optical fiber image reverser blank to obtain the conical optical fiber image reverser, wherein the conical optical fiber image reverser is the conical optical fiber image reverser according to any one of claims 1-3.
5. The method for manufacturing a tapered optical fiber inverter according to claim 4, wherein: the step of preparing the blank of the conical optical fiber image inverter comprises the following specific steps:
and manufacturing blanks with corresponding sizes according to the size requirement of the conical optical fiber image inverter, wherein two end faces of each blank are hexagonal heads.
6. The method for manufacturing a tapered optical fiber inverter according to claim 4, wherein: the step of stretching the blank groove by applying corresponding pulling force to the two end faces of the blank to obtain a stretched blank specifically comprises the following steps:
connecting two end faces of the blank with torsion stretching equipment;
Heating a heating wire of a heating furnace aiming at the central position of the blank groove to heat and soften the central position of the blank groove;
according to the enlargement and reduction ratio of the conical optical fiber image reverser, the torsion stretching equipment applies corresponding pulling force to stretch the blank groove through the two end surfaces of the blank, so that the stretched blank is in the shape of an optical fiber zoom part.
7. The method for manufacturing a tapered optical fiber inverter according to claim 4, wherein: the step of twisting the stretched blank groove by applying corresponding twisting force to the two end surfaces of the blank to obtain a twisted blank comprises the following steps:
connecting the two end surfaces of the stretched blank with torsion stretching equipment;
heating a heating wire of a heating furnace in alignment with a first position of a stretched blank groove to heat and soften the first position of the blank groove, wherein the first position of the blank groove is positioned between the central position of the blank groove and one end face of the blank;
the torsion stretching equipment applies corresponding torsion force to twist the first position of the blank groove through the two end surfaces of the blank, so that the two sides of the first position of the blank groove are twisted into the shape of an optical fiber reverse-image twisting part;
heating a heating wire of a heating furnace in alignment with a second position of the stretched blank groove to heat and soften the second position of the blank groove, wherein the second position of the blank groove is positioned between the central position of the blank groove and the other end face of the blank;
The torsion stretching equipment applies corresponding torsion force to twist the second position of the blank groove through the two end surfaces of the blank, so that the two sides of the second position of the blank groove are twisted into the shape of the optical fiber inverted torsion part.
8. The method for manufacturing a tapered optical fiber inverter according to claim 4, wherein: the step of cutting the twisted blank to obtain a cut conical optical fiber image inverter blank specifically comprises the following steps:
Cutting the twisted blank groove at the center position by using cutting equipment, so as to obtain 2 conical optical fiber image reverser blanks;
Milling and measuring the blank of the tapered optical fiber image reverser according to the requirement of the magnification and reduction of the tapered optical fiber image reverser.
9. The method for manufacturing a tapered optical fiber inverter according to claim 4, wherein: the step of carrying out subsequent processing on the cut conical optical fiber image reverser blank to obtain the conical optical fiber image reverser comprises the following specific steps:
And processing the cut conical optical fiber image reverser blank into a finished product with a corresponding shape according to the external dimension requirement of the conical optical fiber image reverser, and carrying out fine grinding and polishing on two end surfaces of the blank to finally form the conical optical fiber image reverser.
10. A preparation method of a tapered optical fiber image inverter is characterized by comprising the following steps: the method comprises the following steps:
preparing a blank of a conical optical fiber image reverser, wherein the blank of the conical optical fiber image reverser comprises a blank groove and two end surfaces of the blank, and the two ends of the blank groove are respectively connected with the two end surfaces of the blank;
the blank groove is twisted by applying corresponding pulling force to the two end faces of the blank, so that a twisted blank is obtained, and the twisted blank is a blank containing the shape of the optical fiber reverse-image twisting part;
stretching the twisted blank groove by applying corresponding torsion force to the two end surfaces of the blank in sequence to obtain a stretched blank, wherein the stretched blank simultaneously comprises an optical fiber zooming part shape and an optical fiber reverse image twisting part shape, and the optical fiber zooming part shape meets the requirement of the magnification-reduction ratio of a conical optical fiber reverse image device;
cutting the stretched blank to obtain a cut conical optical fiber image inverter blank;
and carrying out subsequent processing on the cut conical optical fiber image reverser blank to obtain the conical optical fiber image reverser, wherein the conical optical fiber image reverser is the conical optical fiber image reverser according to any one of claims 1-3.
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| CN110568550B (en) * | 2019-09-24 | 2020-10-09 | 广州宏晟光电科技股份有限公司 | Shape forming method of optical fiber image inverter |
| CN111580213B (en) * | 2020-06-18 | 2023-01-31 | 中国建筑材料科学研究总院有限公司 | Double Straight Zone Curved Optical Fiber Taper and Its Application |
| CN112025416B (en) * | 2020-07-24 | 2021-07-02 | 北方夜视技术股份有限公司 | Method for preparing quasi-hexagonal blank capable of reducing cracks in inverter torsion process |
| CN112661419B (en) * | 2020-12-23 | 2023-09-12 | 云南北方光学科技有限公司 | Separation and recovery method of fiber optic element |
| CN115724583B (en) * | 2022-11-21 | 2024-04-02 | 中国建筑材料科学研究总院有限公司 | Optical fiber inverter and preparation method thereof |
| CN118244417B (en) * | 2023-11-30 | 2024-12-06 | 中国建筑材料科学研究总院有限公司 | High uniformity, high transmittance optical fiber image invertor and preparation method and application thereof |
| CN119200087A (en) * | 2024-01-18 | 2024-12-27 | 美希艾精密仪器(苏州)有限公司 | Fiber optic imaging system and optical detection equipment |
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