Preparation method of high-positioning-precision line-plane conversion type infrared chalcogenide optical fiber image transmission bundle

Abstract

The invention discloses a preparation method of a high-positioning-precision line-plane conversion type infrared chalcogenide optical fiber image-transmitting bundle. The preparation method comprises the following steps: preparing an infrared chalcogenide glass optical fiber, manufacturing a precision positioning wire arrangement disc and a precision positioning plane array sheet arrangement mold, preparing a single-layer optical fiber sheet and preparing a line-plane conversion type optical fiber bundle. According to the preparation method, V-shaped grooves are engraved in the surface of a cylinder of a metal wire arrangement disc at equal intervals, then a single-layer optical fiber sheet containing a large number of optical fiber monofilaments is automatically wound under the cooperation of a high-precision optical fiber winding machine, and then the two ends of the single-layer optical fiber sheet are stacked according to an area array mode and a linear array mode to form the line-plane conversion type optical fiber image transmitting bundle. The manual participation degree in the filament arranging process is reduced, and the preparation efficiency of the optical fiber image-transmitting bundle can be greatly improved. The maximum linear array length of the oversized and high-positioning-precision line-plane conversion type infrared chalcogenide fiber image-transmitting bundle prepared by the method is more than 700mm, and the absolute positioning precision is superior to + / -4 [mu] m.

Description

Technical Field

[0001] The invention belongs to the technical field of optical fiber image transmission devices, and in particular relates to a method for preparing a high positioning accuracy line-to-surface conversion type infrared chalcogenide optical fiber image transmission bundle. Background Art

[0002] Infrared fiber image bundle (IRFB) is a flexible passive infrared image transmission device, usually working in 3-5μm and 8-12μm infrared atmospheric windows. It is composed of several infrared optical fiber filaments arranged in a certain pattern, with the characteristics of small size, light weight, and bendability. It has broad application prospects in aerospace, medical health, and industrial detection.

[0003] IRFB can be divided into conventional fiber bundles and line-to-surface conversion fiber bundles. The input and output ends of conventional IRFBs are both planar arrays (usually rectangular or square in shape), and the single fibers are generally tightly stacked. They are usually used as core optical components for medical and industrial endoscopes. The input end of the line-to-surface conversion IRFB is a linear array, that is, the number of lateral single wires is much larger than the number of longitudinal single wires, and the end face shape is like a line; its output end is a surface array, and the single wires are stacked in an array so that they correspond one-to-one with the pixels of the detector; this type of IRFB has great application potential in the field of large-field infrared imaging (such as space infrared remote sensing). In the imaging system, the optical fiber linear array at its input end is used to replace the scarce and expensive long-line array infrared detector (currently, the cost of such long-line array infrared detector is extremely high and there are still related technical problems in my country that need to be solved urgently), so that the image plane of the front telescope optical system is coupled with its input end, and the output end surface array is coupled with the surface array infrared detector through the corresponding subsequent coupling optical system. The pixel of the surface array infrared detector receives the information emitted by each optical fiber one-to-one, realizing the spatial transmission and line-to-surface conversion of the infrared image, thereby realizing large-field infrared push-scanning imaging using the mature and low-cost surface array infrared detector.

[0004] Optical fibers that can transmit 3-5μm or 8-12μm mainly include chalcogenide glass fibers, fluoride glass fibers, silver halide crystal fibers, hollow waveguide fibers, and hollow antiresonant fibers. Among them, chalcogenide glass fibers have the advantages of excellent thermal stability and chemical stability, low infrared transmission loss, and low preparation cost, and are considered to be ideal materials for preparing IRFBs. At present, high-performance IRFBs are mainly prepared based on chalcogenide glass fibers. For a long time, the line-to-surface conversion infrared chalcogenide glass fiber image transmission bundles are usually prepared by stacking, that is, firstly, the optical fiber single fibers are arranged horizontally and cured by glue to form a single-layer optical fiber sheet, and then one end of several single-layer optical fiber sheets is arranged horizontally and cured by glue to form the input linear array end of the optical fiber bundle, and the other end is stacked and cured by glue to form the output planar array end of the optical fiber bundle. In theory, as long as the diameter and number of the single fibers in the single-layer optical fiber sheet are the same, the high absolute positioning accuracy of the single fibers in the planar array end of the optical fiber bundle can be achieved by stacking, thereby realizing a one-to-one correspondence between the single fibers in the optical fiber bundle and the pixels in the imaging detector. However, the size of actual optical fiber filaments always fluctuates. For example, if the diameter of a filament fluctuates by 1%, the size accumulation effect caused by the horizontal or vertical arrangement of dozens of filaments will lead to serious misalignment, thus causing cross-image. In order to improve the absolute positioning accuracy of optical fiber filaments, researchers proposed a method of arranging filaments in a grooved flat mold to limit the distance between optical fibers to eliminate the size accumulation effect caused by the fluctuation of the fiber diameter. However, this process faces problems such as high manual participation, high defective rate, and low preparation efficiency. Summary of the invention

[0005] In view of the above-mentioned problems existing in the prior art, the present invention provides a method for preparing a line-to-surface conversion infrared chalcogenide optical fiber imaging bundle with high positioning accuracy. Specifically, a single-layer optical fiber sheet is prepared on an automatic ring winding machine using a precision positioning wire arrangement disk engraved with a V-groove, which greatly improves the wire arrangement efficiency and reduces the manual participation in the wire arrangement process. The maximum linear array length of the prepared line-to-surface conversion infrared chalcogenide optical fiber imaging bundle exceeds 700 mm, and the absolute positioning accuracy is better than ±4 μm.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A method for preparing a high positioning accuracy line-to-surface conversion infrared chalcogenide optical fiber image transmission bundle comprises the following steps:

[0008] Step 1: Preparation of infrared chalcogenide glass optical fiber

[0009] A chalcogenide glass rod as a core material is prepared in a quartz tube by using a vacuum melting-quenching technique; a chalcogenide glass tube as an inner cladding material is prepared in a quartz tube by combining the vacuum melting-quenching technique and the vacuum spinning technique; the chalcogenide glass rod is inserted into the chalcogenide glass tube, and then a thermoplastic polymer film as an outer cladding material is wrapped on the outer surface to assemble into an optical fiber preform; the optical fiber preform is drawn into an optical fiber with a diameter of d under atmosphere protection to obtain an infrared chalcogenide glass optical fiber;

[0010] Step 2: Make precision positioning wire arrangement disc and precision positioning array array die

[0011] On the surface of the cylinder of the metal wire arrangement disk, V-shaped grooves are engraved in a direction perpendicular to the axis of the wire arrangement disk, and the spacing between adjacent V-shaped grooves is d+t, so as to obtain a precisely positioned wire arrangement disk;

[0012] On the inner surface of the longitudinal positioning plate of the metal array array die, V-shaped grooves are engraved in the horizontal direction, and the spacing between adjacent V-shaped grooves is d+t, so as to obtain a precision positioning array array die;

[0013] Step 3: Preparation of single-layer optical fiber sheet

[0014] The infrared chalcogenide glass optical fiber prepared in step 1 is rewound onto a standard optical fiber reel under a tension of 0.1 to 0.2 N, and then the standard optical fiber reel is fixed on the wire feeding end of a high-precision optical fiber ring winding machine; a layer of release agent is sprayed on the surface of the V-groove of the precision positioning wire arrangement reel, and then it is fixed on the wire receiving end of the high-precision optical fiber ring winding machine; the optical fiber on the standard optical fiber reel is pulled to the wire receiving end via the optical fiber positioning guide wheel, and fixed on the V-groove on one edge of the precision positioning wire arrangement reel, and this is set as the starting point for wire winding, i.e., the 0th turn; the wire winding step value is set to d+t, and the high-precision optical fiber ring winding machine is started so that the precision positioning wire arrangement reel rotates once After one circle, the optical fiber positioning guide wheel moves one grid (moving distance d+t) to the next V-groove, and the high-precision optical fiber winding machine synchronously records the number of circles. When the number of circles reaches the required n circles (n is a positive integer), the winding is stopped; a layer of heat-curing glue is evenly applied on both sides of the line connecting the points corresponding to the full number of circles, and the length of the glue-coated part is 4 to 8 cm; the precision positioning wire arrangement disk is removed from the high-precision optical fiber winding machine, and placed in an oven to cure the heat-curing glue; then the annular optical fiber sheet is removed from the precision positioning wire arrangement disk, and the annular optical fiber sheet is cut along the line connecting the points corresponding to the full number of circles to obtain a single-layer optical fiber sheet with neatly arranged ends and loose in the middle;

[0015] Step 4: Prepare line-to-surface conversion optical fiber bundle

[0016] One end of several single-layer optical fiber sheets is stacked layer by layer in a precision positioning surface array arrangement mold, and a layer of heat-curing glue is applied between the single-layer optical fiber sheets, so that the single fibers on both sides of each layer of optical fiber sheets are stuck in the corresponding V-grooves in the precision positioning surface array arrangement mold; the other end of the single-layer optical fiber sheets is tightly arranged into a layer in a linear array mold, and a layer of heat-curing glue is applied between adjacent single-layer optical fiber sheets; the two ends are heated and cured to obtain a line-to-surface conversion optical fiber bundle; finally, the optical fiber bundle is armored and end-face polished.

[0017] Preferably, the thermoplastic polymer film is made of polyetherimide (PEI), polyethersulfone (PES) or polycarbonate (PC).

[0018] Preferably, the gas used for the atmosphere protection is nitrogen or argon.

[0019] Preferably, d≥50μm, 5μm≤t≤10μm.

[0020] Preferably, the V-shaped groove has an included angle of 90° and a depth of 0.4d.

[0021] Preferably, the V-groove is engraved using laser micromachining technology.

[0022] Preferably, the release agent is a dry release agent.

[0023] More preferably, the main component of the dry release agent is silicone oil.

[0024] Preferably, the heat curing adhesive is EPOTEK 353ND epoxy resin adhesive.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The present invention engraves equally spaced V-shaped grooves on the surface of the cylinder of the metal wire arrangement disk, and then automatically winds a single-layer optical fiber sheet containing a large number of optical fiber filaments with the cooperation of a high-precision optical fiber winding machine. This can eliminate the misalignment of the optical fiber filaments caused by the fluctuation of the diameter of the optical fiber filaments, while reducing the degree of manual participation in the wire arrangement process, greatly improving the preparation efficiency of the optical fiber image transmission bundle.

[0027] (2) The preparation method of the present invention can be used to prepare ultra-large-size, high-positioning-precision line-to-surface conversion infrared chalcogenide fiber-optic image transmission bundles, with a maximum linear array length exceeding 700 mm and an absolute positioning accuracy better than ±4 μm. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the precision positioning wire arrangement disk, where 1 is the left clamping plate, 2 is the right clamping plate, 3 is the upper cylinder, 4 is the lower cylinder, d is the diameter of the optical fiber single wire, and d+t is the V-groove spacing.

[0029] Figure 2 Schematic diagram of the precision positioning surface array mold, where 5 is the left longitudinal positioning plate, 6 is the right longitudinal positioning plate, 7 is the cover plate, 8 is the displacement adjustment bolt, d is the diameter of the optical fiber single wire, and d+t is the V-groove spacing.

[0030] Figure 3 This is a local optical micrograph of the array end of the fiber optic imaging bundle prepared in Example 1. DETAILED DESCRIPTION

[0031] The present invention will be further described below by way of examples, but the protection scope of the present invention is not limited to the examples given.

[0032] Example 1

[0033] Line-to-surface conversion infrared chalcogenide fiber image bundle is composed of As 40 S 60 / As 39 S 61 / PEI monofilaments are arranged, and the core material of the monofilament is As 40 S 60 Chalcogenide glass, inner cladding material is As 39 S 61 Chalcogenide glass, the outer cladding material is thermoplastic polymer PEI, the single wire diameter is 50μm, the linear array end specification of the optical fiber image transmission bundle is 9600x1, and the area array end specification is 120x80.

[0034] The preparation steps are as follows:

[0035] Step 1, preparation of As 40 S 60 / As 39 S 61 / PEI infrared chalcogenide glass optical fiber

[0036] As as the core material was prepared in a quartz tube using vacuum melting-quenching technology. 40 S 60 The glass rod has a diameter of 14.9 mm; As as the inner cladding material is prepared in a quartz tube by combining vacuum melting-quenching technology and vacuum coiling technology. 39 S 61 The inner and outer diameters of the glass tube are 15 mm and 18.9 mm respectively; the prepared As 40 S 60 Glass rod inserted into As 39 S 61 The fiber optic preform was then drawn at 300°C and nitrogen atmosphere to form an As fiber optic preform with a diameter of 50 μm. 40 S 60 / As39 S 61 / PEI optical fiber.

[0037] Step 2: Make precision positioning wire arrangement disc and precision positioning array array die

[0038] Laser micromachining technology is used to engrave V-shaped grooves on the surface of a metal wire tray (made of aluminum alloy, with a diameter of 150 mm and a width of 10 mm) in a direction perpendicular to the axis of the wire tray. The angle of the V-shaped groove is 90°, the depth is 20 μm, and the spacing between adjacent V-shaped grooves is 55 μm. A precision positioning wire tray is obtained, and its structure is as follows: Figure 1 As shown, it is composed of a left clamping plate 1, a right clamping plate 2, an upper cylinder 3 and a lower cylinder 4, which are fixed by screws; a 2mm gap is set between the upper cylinder 3 and the lower cylinder 4 to facilitate the removal of the optical fiber ring after the ring is wound.

[0039] Laser micromachining technology is used to engrave V-grooves in the horizontal direction on the inner surface of the longitudinal positioning plate of the metal array array die (made of aluminum alloy). The angle of the V-grooves is 90°, the depth is 20μm, and the spacing between adjacent V-grooves is 55μm. The precision positioning array array die is obtained. Its structure is as follows: Figure 2 As shown, it is composed of a left longitudinal positioning plate 5, a right longitudinal positioning plate 6, a cover plate 7 and a displacement adjustment bolt 8; the displacement adjustment bolt 8 is used to fine-tune the distance between the left longitudinal positioning plate 5 and the right longitudinal positioning plate 6 so that the V-shaped groove effectively limits the position of the optical fiber sheet; the cover plate 7 is fixed to the left longitudinal positioning plate 5 and the right longitudinal positioning plate 6 by screws.

[0040] Step 3: Preparation of single-layer optical fiber sheet

[0041] The As prepared in step 1 40 S 60 / As 39 S 61 / PEI optical fiber is rewound onto the standard optical fiber reel under a tension of 0.1N, and then the standard optical fiber reel is fixed on the wire feeding end of the high-precision optical fiber winding machine; a layer of dry release agent (Meishu 602) whose main component is silicone oil is sprayed on the surface of the V-groove of the precision positioning wire arrangement reel, and then it is fixed on the wire receiving end of the high-precision optical fiber winding machine; the optical fiber on the standard optical fiber reel is pulled to the wire receiving end through the optical fiber positioning guide wheel, and fixed on the V-groove on one edge of the precision positioning wire arrangement reel, and this place is set as the starting point of the wire winding, that is, the 0th circle; the wire winding step value is set to 55μm, and the high-precision optical fiber winding machine is started, so that for every rotation of the precision positioning wire arrangement reel, the optical fiber positioning guide wheel moves one grid to the next V-groove (movement distance 55μm), and the high-precision optical fiber winding machine synchronously records the number of winding circles, and stops winding when the number of circles reaches 120; a layer of EPOTEK is evenly applied on both sides of the line connecting the corresponding points of the whole number of circles 353ND epoxy resin glue, the length of the glue-coated part is 4cm; remove the precision positioning wire arrangement disk from the high-precision optical fiber winding machine, and put it into an 80℃ oven for 30 minutes to solidify the glue; then remove the screws of the precision positioning wire arrangement disk, remove the left clamping plate 1 and the right clamping plate 2, make the upper cylinder 3 and the lower cylinder 4 contact, and remove the annular optical fiber sheet; then cut the annular optical fiber sheet along the line connecting the corresponding points of the whole circle to obtain a single-layer optical fiber sheet with neatly arranged ends and loose in the middle.

[0042] Step 4: Prepare line-to-surface conversion optical fiber bundle

[0043] Stack one end of 80 single-layer optical fiber sheets layer by layer in the precision positioning surface array arrangement mold, apply a layer of EPOTEK 353ND epoxy resin glue between the optical fiber sheets, adjust the displacement adjustment bolts of the precision positioning surface array arrangement mold, so that the single fibers on both sides of each layer of optical fiber sheets are stuck in the corresponding V-grooves in the precision positioning surface array arrangement mold, and then cover the cover plate; arrange the other end of the single-layer optical fiber sheets tightly into a layer in the linear array mold, and apply a layer of EPOTEK353ND epoxy resin glue between adjacent single-layer optical fiber sheets; heat and cure the two ends to obtain a line-to-surface conversion optical fiber bundle; finally, armor the optical fiber bundle and polish the end face.

[0044] The array end of the prepared fiber optic image bundle was observed using a Zeiss Axio scope A1 optical microscope with a size measurement function. The results are as follows: Figure 3 As shown. The coordinate system is established with the lower left single wire as the origin. Table 1 gives the coordinates and coordinate deviations of some single wires. It can be seen that the absolute positioning accuracy of the single wire is better than ±4μm. The linear array length of the optical fiber bundle is 528mm measured with a ruler.

[0045] Table 1 Coordinates and coordinate deviations of representative single fibers in the array end of the optical fiber imaging bundle prepared in Example 1

[0046]

[0047] Example 2

[0048] Line-to-surface conversion infrared chalcogenide fiber image bundle is composed of Ge 10 As 30 Se 40 Te 20 / Ge 10 As 30 Se 44 Te 16 / PES monofilaments are arranged, and the core material of the monofilament is Ge 10 As 30 Se 40 Te 20 Chalcogenide glass, inner cladding material is Ge 10 As 30 Se 44 Te 16 Chalcogenide glass, the outer cladding material is thermoplastic polymer PES, the single wire diameter is 100μm, the linear array end specification of the optical fiber image transmission bundle is 4800x1, and the area array end specification is 80x60. The preparation steps are as follows:

[0049] Step 1, preparation of Ge 10 As 30 Se 40 Te 20 / Ge 10 As 30 Se 44 Te 16 / PES infrared chalcogenide glass optical fiber

[0050] Ge as the core material was prepared in a quartz tube using vacuum melting-quenching technology. 10 As 30 Se 40 Te 20 The glass rod has a diameter of 14.9 mm; Ge as the inner cladding material is prepared in a quartz tube by combining vacuum melting-quenching technology and vacuum coiling technology. 10 As 30 Se 44 Te 16 The inner and outer diameters of the glass tube are 15 mm and 18.9 mm respectively; the prepared Ge 10 As 30 Se 40 Te 20 The glass rod is inserted into the Ge 10 As 30 Se 44 Te 16The fiber optic preform was then drawn at 290°C under argon protection to form a Ge2O3 fiber with a diameter of 100 μm. 10 As 30 Se 40 Te 20 / Ge 10 As 30 Se 44 Te 16 / PES optical fiber.

[0051] Step 2: Make precision positioning wire arrangement disc and precision positioning array array die

[0052] Laser micromachining technology is used to engrave V-shaped grooves on the surface of a metal wire tray (made of aluminum alloy, with a diameter of 150 mm and a width of 10 mm) in a direction perpendicular to the axis of the wire tray. The angle of the V-shaped groove is 90°, the depth is 40 μm, and the spacing between adjacent V-shaped grooves is 108 μm. A precision positioning wire tray is obtained, and its structure is as follows: Figure 1 shown.

[0053] Laser micromachining technology is used to engrave V-grooves in the horizontal direction on the inner surface of the longitudinal positioning plate of the metal array array die (made of aluminum alloy). The angle of the V-grooves is 90°, the depth is 40μm, and the spacing between adjacent V-grooves is 108μm. The precision positioning array array die is obtained. Its structure is as follows: Figure 2 shown.

[0054] Step 3: Preparation of single-layer optical fiber sheet

[0055] The Ge prepared in step 1 10 As 30 Se 40 Te 20 / Ge 10 As 30 Se 44 Te 16 / PES optical fiber is rewound onto a standard optical fiber reel under a tension of 0.15N, and then the standard optical fiber reel is fixed on the wire feeding end of the high-precision optical fiber ring winding machine; a layer of dry release agent (Meishu 602) whose main component is silicone oil is sprayed on the surface of the V-groove of the precision positioning wire arrangement reel, and then it is fixed on the wire receiving end of the high-precision optical fiber ring winding machine; the optical fiber on the standard optical fiber reel is pulled to the wire receiving end through the optical fiber positioning guide wheel, and fixed on the V-groove on one edge of the precision positioning wire arrangement reel, and this place is set as the starting point of the wire winding, that is, the 0th circle; the wire winding step value is set to 108μm, and the high-precision optical fiber ring winding machine is started, so that for every rotation of the precision positioning wire arrangement reel, the optical fiber positioning guide wheel moves one grid to the next V-groove (movement distance 108μm), and the high-precision optical fiber ring winding machine synchronously records the number of winding turns, and stops winding when the number of turns reaches 80; a layer of EPOTEK is evenly applied on both sides of the line connecting the corresponding points of the whole number of turns 353ND epoxy resin glue, the length of the glue-coated part is 6cm; remove the precision positioning wire arrangement disk from the high-precision optical fiber winding machine, and put it into an 80℃ oven for 30 minutes to solidify the glue; then remove the screws of the precision positioning wire arrangement disk, remove the left clamping plate 1 and the right clamping plate 2 on the lower side, make the upper cylinder 3 and the lower cylinder 4 contact, and remove the annular optical fiber sheet; then cut the annular optical fiber sheet along the line connecting the corresponding points of the whole circle to obtain a single-layer optical fiber sheet with neatly arranged ends and loose in the middle.

[0056] Step 4: Prepare line-to-surface conversion optical fiber bundle

[0057] Stack one end of 60 single-layer optical fiber sheets layer by layer in the precision positioning surface array arrangement mold, apply a layer of EPOTEK 353ND epoxy resin glue between the optical fiber sheets, adjust the displacement adjustment bolts of the precision positioning surface array arrangement mold, so that the single fibers on both sides of each layer of optical fiber sheets are stuck in the corresponding V-grooves in the precision positioning surface array arrangement mold, and then cover the cover plate; arrange the other end of the single-layer optical fiber sheets tightly into a layer in the linear array mold, and apply a layer of EPOTEK353ND epoxy resin glue between adjacent single-layer optical fiber sheets; heat and cure the two ends to obtain a line-to-surface conversion optical fiber bundle; finally, armor the optical fiber bundle and polish the end face.

[0058] The array end of the prepared optical fiber image transmission bundle was observed using a Zeiss Axio scope A1 optical microscope with a size measurement function. A coordinate system was established with a single wire in the array end as the origin. Table 2 shows the coordinates and coordinate deviations of some single wires. It can be seen that the absolute positioning accuracy of the single wire is better than ±4μm. The linear array length of the optical fiber bundle was measured with a ruler to be 518mm.

[0059] Table 2 Coordinates and coordinate deviations of representative single fibers in the array end of the optical fiber imaging bundle prepared in Example 2

[0060]

[0061] Example 3

[0062] Line-to-surface conversion infrared chalcogenide fiber image bundle is composed of As 40 Se 35 Te 25 / As 40 Se 40 Te 20 / PC monofilaments are arranged, and the core material of the monofilament is As 40 Se 35 Te 25 Chalcogenide glass, inner cladding material is As 40 Se 40 Te 20 Chalcogenide glass, the outer cladding material is thermoplastic polymer PC, the single wire diameter is 150μm, the linear array end specification of the optical fiber image transmission bundle is 4800x1, and the area array end specification is 80x60. The preparation steps are as follows:

[0063] Step 1, preparation of As 40 Se 35 Te 25 / As 40 Se 40 Te 20 / PC infrared chalcogenide glass optical fiber

[0064] As as the core material was prepared in a quartz tube using vacuum melting-quenching technology. 40 Se 35 Te 25 The glass rod has a diameter of 14.9 mm; As as the inner cladding material is prepared in a quartz tube by combining vacuum melting-quenching technology and vacuum coiling technology. 40 Se 40 Te 20 The inner and outer diameters of the glass tube are 15 mm and 18.9 mm respectively; the prepared Ge 10 As 30 Se 40 Te 20 The glass rod is inserted into the Ge 10 As 30 Se 44 Te 16 The fiber optic preform is then drawn at 230°C under nitrogen protection into an As fiber optic preform with a diameter of 150 μm. 40 Se 35 Te 25 / As 40 Se 40 Te 20 / PC optical fiber.

[0065] Step 2: Make precision positioning wire arrangement disc and precision positioning array array die

[0066] Laser micromachining technology is used to engrave V-shaped grooves on the surface of a metal wire tray (made of aluminum alloy, with a diameter of 200 mm and a width of 15 mm) in a direction perpendicular to the axis of the wire tray. The angle of the V-shaped groove is 90°, the depth is 60 μm, and the spacing between adjacent V-shaped grooves is 160 μm. A precisely positioned wire tray is obtained, and the structure is as follows: Figure 1 shown.

[0067] Laser micromachining technology is used to engrave V-grooves in the horizontal direction on the inner surface of the longitudinal positioning plate of the metal array array die (made of aluminum alloy). The angle of the V-grooves is 90°, the depth is 60μm, and the spacing between adjacent V-grooves is 160μm. The precision positioning array array die is obtained. Its structure is as follows: Figure 2 shown.

[0068] Step 3: Preparation of single-layer optical fiber sheet

[0069] The As prepared in step 1 40 Se 35 Te 25 / As 40 Se 40 Te 20 / PC optical fiber is rewound onto the standard optical fiber reel under a tension of 0.2N, and then the standard optical fiber reel is fixed on the wire feeding end of the high-precision optical fiber ring winding machine; a layer of dry release agent (Meishu 602) whose main component is silicone oil is sprayed on the surface of the V-groove of the precision positioning wire arrangement reel, and then it is fixed on the wire receiving end of the high-precision optical fiber ring winding machine; the optical fiber on the standard optical fiber reel is pulled to the wire receiving end through the optical fiber positioning guide wheel, and fixed on the V-groove on one edge of the precision positioning wire arrangement reel, and this place is set as the starting point of the wire winding, that is, the 0th circle; the wire winding step value is set to 160μm, and the high-precision optical fiber ring winding machine is started, so that for every rotation of the precision positioning wire arrangement reel, the optical fiber positioning guide wheel moves one grid to the next V-groove (movement distance 160μm), and the high-precision optical fiber ring winding machine synchronously records the number of winding circles, and stops winding when the number of circles reaches 80; a layer of EPOTEK is evenly applied on both sides of the line connecting the corresponding points of the whole number of circles 353ND epoxy resin glue, the length of the glue-coated part is 8cm; remove the precision positioning wire arrangement disk from the high-precision optical fiber winding machine, and put it into an oven at 80℃ for 30 minutes to solidify the glue; then remove the screws of the precision positioning wire arrangement disk, remove the left clamping plate 1 and the right clamping plate 2, make the upper cylinder 3 and the lower cylinder 4 contact, and remove the annular optical fiber sheet; then cut the annular optical fiber sheet along the line connecting the corresponding points of the whole circle to obtain a single-layer optical fiber sheet with neatly arranged ends and loose in the middle.

[0070] Step 4: Prepare line-to-surface conversion optical fiber bundle

[0071] Stack one end of 60 single-layer optical fiber sheets layer by layer in the precision positioning surface array arrangement mold, apply a layer of EPOTEK 353ND epoxy resin glue between the optical fiber sheets, adjust the displacement adjustment bolts of the precision positioning surface array arrangement mold, so that the single fibers on both sides of each layer of optical fiber sheets are stuck in the corresponding V-grooves in the precision positioning surface array arrangement mold, and then cover the cover plate; arrange the other end of the single-layer optical fiber sheets tightly into a layer in the linear array mold, and apply a layer of EPOTEK353ND epoxy resin glue between adjacent single-layer optical fiber sheets; heat and cure the two ends to obtain a line-to-surface conversion optical fiber bundle; finally, armor the optical fiber bundle and polish the end face.

[0072] The array end of the prepared optical fiber image transmission bundle was observed using a Zeiss Axio scope A1 optical microscope with a size measurement function. A coordinate system was established with a single wire in the array end as the origin. Table 3 shows the coordinates and coordinate deviations of some single wires. It can be seen that the absolute positioning accuracy of the single wire is better than ±4μm. The linear array length of the optical fiber bundle was measured to be 768mm using a ruler.

[0073] Table 3 Coordinates and coordinate deviations of representative single fibers in the array end of the optical fiber imaging bundle prepared in Example 3

[0074]

Claims

1. Preparation method of high positioning accuracy line-to-surface conversion infrared chalcogenide optical fiber image transmission bundle, It is characterized in that The following steps are involved: Step 1: Preparation of infrared chalcogenide glass optical fiber A chalcogenide glass rod as a core material is prepared in a quartz tube by using a vacuum melting-quenching technique; a chalcogenide glass tube as an inner cladding material is prepared in a quartz tube by combining the vacuum melting-quenching technique and the vacuum spinning technique; the chalcogenide glass rod is inserted into the chalcogenide glass tube, and then a thermoplastic polymer film as an outer cladding material is wrapped on the outer surface to assemble into an optical fiber preform; the optical fiber preform is drawn into an optical fiber with a diameter of d under atmosphere protection to obtain an infrared chalcogenide glass optical fiber; Step 2: Make precision positioning wire arrangement disc and precision positioning array array die On the surface of the cylinder of the metal wire arrangement disk, V-shaped grooves are engraved in a direction perpendicular to the axis of the wire arrangement disk, and the spacing between adjacent V-shaped grooves is d+t, so as to obtain a precisely positioned wire arrangement disk; On the inner surface of the longitudinal positioning plate of the metal array array die, V-shaped grooves are engraved in the horizontal direction, and the spacing between adjacent V-shaped grooves is d+t, so as to obtain a precision positioning array array die; Step 3: Preparation of single-layer optical fiber sheet The infrared chalcogenide glass optical fiber prepared in step 1 is rewound onto a standard optical fiber reel under a tension of 0.1 to 0.2 N, and then the standard optical fiber reel is fixed on the wire feeding end of a high-precision optical fiber winding machine; after spraying a layer of release agent on the surface of the V-groove of the precision positioning wire arrangement reel, it is fixed on the wire receiving end of the high-precision optical fiber winding machine; the optical fiber on the standard optical fiber reel is pulled to the wire receiving end via the optical fiber positioning guide wheel, and fixed on the V-groove on one edge of the precision positioning wire arrangement reel, and this is set as the starting point of the wire winding, i.e., the 0th turn; the wire winding step value is set to d+t, and the high-precision optical fiber winding machine is started to make the precision positioning Each time the wire arrangement disk rotates one circle, the optical fiber positioning guide wheel moves one grid to the next V-groove, and the high-precision optical fiber winding machine synchronously records the number of winding circles, and stops winding when the number of circles reaches the required n circles; a layer of heat-curing glue is evenly applied on both sides of the line connecting the points corresponding to the full number of circles, and the length of the glue-coated part is 4 to 8 cm; the precision positioning wire arrangement disk is removed from the high-precision optical fiber winding machine, and placed in an oven to cure the heat-curing glue; then the annular optical fiber sheet is removed from the precision positioning wire arrangement disk, and the annular optical fiber sheet is cut along the line connecting the points corresponding to the full number of circles to obtain a single-layer optical fiber sheet with neatly arranged ends and loose in the middle; Step 4: Prepare line-to-surface conversion optical fiber bundle One end of several single-layer optical fiber sheets is stacked layer by layer in a precision positioning surface array arrangement mold, and a layer of heat-curing glue is applied between the single-layer optical fiber sheets, so that the single fibers on both sides of each layer of optical fiber sheets are stuck in the corresponding V-grooves in the precision positioning surface array arrangement mold; the other end of the single-layer optical fiber sheets is tightly arranged into a layer in a linear array mold, and a layer of heat-curing glue is applied between adjacent single-layer optical fiber sheets; the two ends are heated and cured to obtain a line-to-surface conversion optical fiber bundle; finally, the optical fiber bundle is armored and end-face polished.

2. The method for preparing the high positioning accuracy line-to-surface conversion infrared chalcogenide optical fiber image transmission bundle according to claim 1, Features: The material of the thermoplastic polymer film is polyetherimide, polyethersulfone or polycarbonate.

3. The method for preparing the high positioning accuracy line-to-surface conversion infrared chalcogenide optical fiber image transmission bundle according to claim 1, Features: The gas used for the atmosphere protection is nitrogen or argon.

4. The method for preparing the high positioning accuracy line-to-surface conversion infrared chalcogenide optical fiber image transmission bundle according to claim 1, Features: The d≥50μm, 5μm≤t≤10μm.

5. The method for preparing the high positioning accuracy line-to-surface conversion infrared chalcogenide optical fiber image transmission bundle according to claim 1, Features: The included angle of the V-shaped groove is 90° and the depth is 0.4d.

6. The method for preparing the high positioning accuracy line-to-surface conversion infrared chalcogenide optical fiber image transmission bundle according to claim 1, Features: The V-shaped groove is engraved by using laser micromachining technology.

7. The method for preparing the high positioning accuracy line-to-surface conversion infrared chalcogenide optical fiber image transmission bundle according to claim 1, Features: The release agent is a dry release agent.

8. The method for preparing the high positioning accuracy line-to-surface conversion infrared chalcogenide optical fiber image transmission bundle according to claim 7, Features: The main component of the dry release agent is silicone oil.

9. The method for preparing the high positioning accuracy line-to-surface conversion infrared chalcogenide optical fiber image transmission bundle according to claim 1, Features: The heat curing adhesive is EPOTEK 353ND epoxy resin adhesive.

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