Preparation method of high-resolution image-transmitting light bar and image-transmitting light bar stretching device

Abstract

The preparation method comprises the following steps: respectively fixing a deposition pipe, a feeding pipe and a tail pipe on a machine tool of deposition equipment, setting raw material feeding parameters, deposition temperature and refractive index distribution, starting deposition operation by the deposition equipment to obtain a prefabricated deposition pipe, performing burning shrinkage on the prefabricated deposition pipe, and performing stretching on the prefabricated deposition pipe to obtain the high-resolution image-transmitting optical wand. A pixel preform is obtained; according to the method, the obtained pixel preform is fed into the optical fiber drawing tower, the pixel preform with high numerical aperture and large inclusion ratio is adopted, optical crosstalk between the pixel preforms can be effectively inhibited, imaging is clear, the optical fiber drawing tower and the image transmitting light rod stretching device are adopted for two-time drawing, the manufacturing process is simple, the process conditions are easy to control, and the method is suitable for industrial production. The light transmission device manufactured through the method is good in uniformity and clear in imaging, can meet the requirements of large-scale production and preparation, and solves the technical problems that in the prior art, an image transmission device is high in loss, the preparation technology is complex, and large-scale production and application are difficult.

Description

Technical Field

[0001] The invention belongs to the field of advanced optical material preparation, and relates to an image transmission light rod, in particular to a preparation method of a high-resolution image transmission light rod and an image transmission light rod stretching device. Background Art

[0002] With the continuous development and progress of science and technology, there are more and more complex electromagnetic environments and high-temperature and high-pressure spaces. Engineering and technical personnel often need to monitor the operation of instruments and equipment, changes in raw materials, and positioning and observation of intelligent robotic arms in real time in complex and harsh environments. Traditional imaging systems generally use sensors such as CCD and CMOS, and also integrate a large number of electronic components. These components cannot work normally under high temperature and high pressure conditions, which greatly restricts the precise control and management of instruments and equipment by engineers, further affecting production safety and production efficiency. On the other hand, instruments and production equipment are developing in the direction of integration and simplification, and their size and weight are also decreasing rapidly. The improvement of equipment integration has put forward higher requirements for each subsystem and each sub-device.

[0003] As an image transmission device, the high-resolution image transmission light rod has a maximum operating temperature of 1500°C due to its quartz matrix properties and is insensitive to strong magnetism. During use, the real-time image can be transmitted from the harsh environment of high temperature and strong magnetism at the front end to the mild environment of normal temperature and pressure at the back end without any distortion or distortion. At the same time, by designing the bending shape in advance, after the light rod is prepared, it can be bent by hot melt and designed into any shape according to the gap or gap reserved by the device to be embedded, so as to realize image transmission in a small space environment.

[0004] High-resolution image transmission optical rods are made by bundling tens of thousands of pixel single filaments and integrating them into one piece. Each single filament is a pixel, and when they are connected end to end, the image can be transmitted from the head end to the end end. Traditional image transmission optical devices are generally prepared by acid dissolution. The acid dissolution method is to first pull the pixel preform rod into thin rods, clean them and bundle them, then pull the finished product after bundling at high temperature and soak it in a specific acid solution. Through the corrosion of the acid, the hard glass quartz in the outer cladding is removed, leaving only the pixel part. During the acid etching process, the quartz layer is partially uneven due to the difficulty in controlling the acid erosion process, which will have a certain impact on the product quality. On the other hand, the products prepared by this process have high losses due to the constraints of its production process flow, and cannot meet the needs of long-distance image transmission, which in turn limits the further promotion and application of this type of image transmission device. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method for preparing a high-resolution image transmission light rod and an image transmission light rod stretching device to solve the technical problems in the prior art that the image transmission device has high loss, complex preparation process, and is difficult to mass produce and apply.

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

[0007] An image transmission light rod stretching device comprises a lower base, a pair of fixed brackets are fixedly arranged on the lower base, an upper base is arranged on the top of the pair of fixed brackets, and a lower chuck screw and a hydrogen-oxygen flame screw are arranged between the lower base and the upper base;

[0008] The lower base is provided with a first servo motor, the output shaft of the first servo motor is vertically upward and a lower chuck screw is fixedly provided at the end thereof; the upper base is provided with a second servo motor, the output shaft of the second servo motor is vertically downward and a hydrogen-oxygen flame screw is fixedly provided at the end thereof;

[0009] The oxyhydrogen flame lead screw is provided with a first connecting plate, on which an oxyhydrogen flame nozzle is fixedly provided; the lower chuck lead screw is provided with a second connecting plate, at the end of which a lower chuck is provided; the bottom of the upper base is provided with a third connecting plate, at the bottom of which a third upper chuck is provided, and the lower chuck is coaxial with the oxyhydrogen flame nozzle and the upper chuck;

[0010] The structure of the lower chuck is the same as that of the upper chuck. The lower chuck or the upper chuck comprises an outer shell, a rotating ring coaxially distributed therewith is arranged inside the outer shell, a driving motor is arranged in the cavity between the outer shell and the rotating ring, and the output shaft of the driving motor is threadedly connected to the rotating ring; a retractable preform rod clamping claw is arranged inside the rotating ring.

[0011] A method for preparing a high-resolution image transmission light rod, based on the image transmission light rod stretching device, the method specifically comprises the following steps:

[0012] Step 1: fix the deposition tube, feed tube and tail tube on the machine tool of the deposition equipment respectively, set the raw material feeding parameters, deposition temperature and refractive index distribution, and the deposition equipment starts the deposition operation to obtain a prefabricated deposition tube, and burn and shrink the prefabricated deposition tube to obtain a pixel preform rod;

[0013] Step 2, feeding the pixel preform obtained in step 1 into an optical fiber drawing tower, and the optical fiber drawing tower draws the pixel preform to obtain a pixel optical fiber monofilament;

[0014] Step 3, cutting, cleaning and drying the pixel optical fiber monofilaments obtained in step 2 in sequence, and inserting a plurality of pixel optical fiber monofilaments into a liner tube to obtain a beam-forming light rod;

[0015] Step 4: Use the image transmission light rod stretching device to stretch the single fiber of the pixel optical fiber that has been threaded and bundled in step 3 to obtain an image transmission light rod.

[0016] The present invention also includes the following technical features:

[0017] Before step 1, the deposition tube, feed tube and tail tube are cleaned with compressed pure nitrogen.

[0018] The method further includes performing hot-melt bending on the designed position of the image-transmitting light rod obtained in step 4 to obtain a bent image-transmitting light rod.

[0019] In step 1, the deposition raw materials include oxygen, freon, germanium tetrachloride and silicon tetrachloride, and the flow rates thereof range from 3750 to 4850 sccm, 75 to 260 sccm, 150 to 880 sccm, and 1950 to 3650 sccm, respectively.

[0020] In step 1, the deposition temperature is set to 800-1280°C; the sintering temperature of the prefabricated deposition tube is 2100-2250°C.

[0021] In step 2, the pixel preform obtained in step 1 is fed into the optical fiber drawing tower at a speed of 1.5-1.8 mm / min. When the optical fiber drawing tower draws the pixel preform obtained in step 1, the drawing temperature is 2150° C. and the drawing speed is 40-45 m / min.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] (I) In the preparation method of the image transmission light rod of the present invention, a pixel preform with a high numerical aperture and a large core ratio is used, which can effectively suppress the crosstalk between the pixel preforms and achieve clear imaging. Secondly, an optical fiber drawing tower and an image transmission light rod stretching device are used for two drawing processes. The production process is simple and the process conditions are easy to control. In addition, the light transmission device manufactured by this method has good uniformity and clear imaging, which may meet the needs of large-scale production and preparation, and solves the technical problems in the prior art that the image transmission device has high loss, complex preparation process, and is difficult to be mass-produced and applied.

[0024] (II) The image transmission light rod prepared by the present invention uses a quartz matrix as a base material, and the maximum operating temperature can reach 1500°C, and it is insensitive to strong magnetism. It can replace the existing image transmission devices and is widely used in high-temperature boiler detection and engine online internal detection.

[0025] (III) The image transmission light rod prepared by the present invention can be designed into a bending shape in advance. After the light rod is prepared, it can be bent by hot melting and designed into any shape according to the gaps reserved by external instruments and equipment, thereby realizing image transmission in a small space environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the image transmission light rod stretching device;

[0027] Figure 2 It is a structural schematic diagram of an upper chuck or a lower chuck in an image transmission light rod stretching device;

[0028] Figure 3 It is the structural diagram of the end face of the image transmission light rod;

[0029] Figure 4 To transfer the image of the light rod hot melt bending diagram;

[0030] Figure 5 Schematic diagram of the image-transmitting light rod, where (a) is the end view, (b) is the partial end view, and (c) is the pixel detail view;

[0031] Figure 6 Loss spectrum of the image-transmitting light rod.

[0032] The meanings of the numbers in the figure are: 1-lower base, 2-fixed bracket, 3-lower chuck screw, 4-upper base, 5-upper chuck, 6-hydrogen-oxygen flame nozzle, 7-hydrogen-oxygen flame screw, 8-lower chuck, 9-first connecting plate, 10-second connecting plate, 11-third connecting plate;

[0033] 801-housing, 802-rotating ring, 803-driving motor, 804-preform rod clamping claw.

[0034] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0035] It should be noted that, unless otherwise specified, all components in the present invention are components known in the art.

[0036] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0037] The present invention provides an image transmission light rod stretching device, comprising a lower base 1, a pair of fixed brackets 2 are fixedly arranged on the lower base 1, an upper base 4 is arranged on the top of the pair of fixed brackets 2, and a lower chuck screw 3 and a hydrogen-oxygen flame screw 7 are arranged between the lower base 1 and the upper base 4;

[0038] A first servo motor is arranged in the lower base 1, the output shaft of the first servo motor is vertically upward and a lower chuck screw 3 is fixedly arranged at the end thereof; a second servo motor is arranged in the upper base 4, the output shaft of the second servo motor is vertically downward and a hydrogen-oxygen flame screw 7 is fixedly arranged at the end thereof;

[0039] A first connecting plate 9 is provided on the oxyhydrogen flame lead screw 7, and an oxyhydrogen flame nozzle 6 is fixedly provided on the first connecting plate; a second connecting plate 10 is provided on the lower chuck lead screw 3, and a lower chuck 8 is provided at the end of the second connecting plate; a third connecting plate is provided at the bottom of the upper base 4, and a third upper chuck 5 is provided at the bottom of the third connecting plate 11, and the lower chuck 8 is coaxial with the oxyhydrogen flame nozzle 6 and the upper chuck 5;

[0040] The structure of the lower chuck 8 is the same as that of the upper chuck 5. The lower chuck 8 or the upper chuck 5 includes a shell 801, a rotating ring 802 coaxially distributed therewith is arranged inside the shell 801, a driving motor 803 is arranged in the cavity between the shell 801 and the rotating ring, and the output shaft of the driving motor 803 is threadedly connected to the rotating ring 802; a retractable preform rod clamping claw 804 is arranged inside the rotating ring 802.

[0041] The present invention also provides a method for preparing a high-resolution image transmission light rod. Based on the image transmission light rod stretching device, the method specifically comprises the following steps:

[0042] Step 1: fix the deposition tube, feed tube and tail tube on the machine tool of the deposition equipment respectively, set the raw material feeding parameters, deposition temperature and refractive index distribution, and the deposition equipment starts the deposition operation to obtain a prefabricated deposition tube, and burn and shrink the prefabricated deposition tube to obtain a pixel preform rod;

[0043] Step 2, feeding the pixel preform obtained in step 1 into an optical fiber drawing tower, and the optical fiber drawing tower draws the pixel preform to obtain a pixel optical fiber monofilament;

[0044] Step 3, cutting, cleaning and drying the pixel optical fiber monofilaments obtained in step 2 in sequence, and inserting a plurality of pixel optical fiber monofilaments into a liner tube to obtain a beam-forming light rod;

[0045] Step 4: Use an image transmission light rod stretching device to stretch the single fiber of the pixel optical fiber that has been threaded and bundled in step 3 to obtain an image transmission light rod.

[0046] In the above-mentioned preparation method of the image-transmitting light rod, a pixel preform with a high numerical aperture and a large core ratio is used, which can effectively suppress the light crosstalk between the pixel preforms and ensure clear imaging. Secondly, an optical fiber drawing tower and an image-transmitting light rod stretching device are used for two drawing processes. The production process is simple and the process conditions are easy to control. The light-transmitting device manufactured by this method has good uniformity and clear imaging, which may meet the needs of large-scale production and preparation, and solves the technical problems in the prior art that the image transmission device has high loss, complex preparation process, and is difficult to apply in large-scale production.

[0047] The present invention also has the following technical features:

[0048] Before step 1, the deposition tube, feed tube and tail tube are cleaned with compressed pure nitrogen.

[0049] In the above technical solution, flushing and purging of various material tubes can effectively remove impurities and dust attached to the tubes, keep the inside of the tubes clean, and thus ensure the purity of the pixel preform rods.

[0050] The method further includes performing hot-melt bending on the designed position of the image-transmitting light rod obtained in step 4 to obtain a bent image-transmitting light rod.

[0051] In the above technical solution, the design position is given according to actual needs. The bending shape can be designed in advance. After the image transmission light rod is prepared, it can be bent by hot melt and designed into any shape according to the gaps reserved by external instruments and equipment, thereby realizing image transmission in a small space environment.

[0052] In step 1, the deposition raw materials include oxygen, freon, germanium tetrachloride and silicon tetrachloride, and the flow rates thereof range from 3750 to 4850 sccm, 75 to 260 sccm, 150 to 880 sccm, and 1950 to 3650 sccm, respectively.

[0053] In the above technical solution, when different raw materials are introduced into the feed pipe, a gas flow meter is used to accurately control the flow of the raw materials, ensuring that all raw materials can be accurately mixed according to the set ratio. Precise and accurate control of the air pressure can ensure that the deposition results are consistent with the design value.

[0054] In step 1, the deposition temperature is set to 800-1280°C; the sintering temperature of the prefabricated deposition tube is 2100-2250°C.

[0055] In the above technical solution, the deposition uses plasma heating technology to generate high temperature at a local position in the deposition tube, so that the input raw materials react under high temperature conditions and deposit on the inner wall of the tube, and the deposition process is completed through multiple rounds according to the design parameters. The precise control of the equipment can ensure that the preform parameters meet the design requirements. The deposition temperature range realizes the deposition of low refractive index fluorine layer and high refractive index germanium layer. The effect of shrinking the preform into a solid preform at the shrinking temperature is better.

[0056] In step 2, the pixel preform obtained in step 1 is fed into a fiber drawing tower at a speed of 1.5 to 1.8 mm / min. When the pixel preform obtained in step 1 is drawn by the fiber drawing tower, the drawing temperature is 2150° C. and the drawing speed is 40 to 45 m / min.

[0057] In the above technical solution, when the wire drawing temperature is 2150°C and the wire drawing speed is 40-45m / min, the wire drawing effect and efficiency are optimal.

[0058] Example:

[0059] This embodiment provides a method for preparing a high-resolution image transmission light rod, which specifically includes the following steps:

[0060] Step 1, preparing a pixel preform;

[0061] Step 1.1, raw materials and deposition preparation;

[0062] Cut the quartz liner into the required length according to different requirements such as feeding, deposition, dust removal, etc., and ensure that the cut is flat and smooth.

[0063] Clean the feed pipe, dip the methanol solution with dust-free paper, and wipe the outer surface of the feed pipe; insert dust-free paper of appropriate size into the inner wall of the feed pipe, wet it with methanol solution, and use a pure nitrogen air gun to purge and clean the inner surface of the feed pipe for 30 seconds; set aside after cleaning; clean the deposition tube. Use the same method as the previous step to clean the inner and outer walls. After the air gun is purged and cleaned, soak it in 45% HF solution for 5 minutes; set aside after cleaning; use the method of cleaning the feed pipe to clean the tail pipe and dust removal pipe in turn. After cleaning, use a strong flashlight to illuminate the inner and outer walls of the tube to observe whether there are any impurities remaining. If impurities are observed, repeat the cleaning process and test again until no impurities remain.

[0064] The cleaned different material pipes are welded and fixed on the lathe of the plasma vapor deposition equipment, the pressure difference between the deposition tail pipe and the external environment is set to 15 mbar, and the flow rates of deposition raw materials oxygen, freon, germanium tetrachloride, and silicon tetrachloride are set to 3750-4850 sccm, 75-260 sccm, 150-880 sccm, and 1950-3650 sccm, respectively.

[0065] Step 1.2, deposition and sintering;

[0066] The deposition of the preform rod is carried out by plasma vapor deposition process. The deposition temperature is set to the range of 800-1280℃. The plasma vapor deposition is carried out according to the designed refractive index distribution. The equipment system automatically runs according to the set value. After multiple rounds of deposition, the preformed deposition tube is obtained. After the deposition is completed, the preformed deposition tube is sintered at a temperature range of 2100-2250℃ to obtain the pixel preform rod.

[0067] In this embodiment, flushing and purging of various material tubes can effectively remove impurities and dust attached to the tubes, keep the inside of the tubes clean, and thus ensure the purity of the pixel preform rods.

[0068] In this embodiment, when different raw materials are introduced into the feed pipe, a gas flow meter is used to accurately control the flow of the raw materials to ensure that all raw materials can be accurately mixed according to the set ratio. Precise and accurate control of the gas pressure can ensure that the deposition result is consistent with the design value.

[0069] In this embodiment, deposition uses plasma heating technology to generate high temperature at a local position in the deposition tube, so that the input raw materials react under high temperature conditions and deposit on the inner wall of the tube, and the deposition process is completed through multiple rounds according to the design parameters. The precise control of the equipment can ensure that the preform parameters meet the design requirements.

[0070] In this embodiment, the numerical aperture of the pixel preform is 0.38-0.41, the core diameter is 11.85 mm, the cladding diameter is 20.15 mm, and the core-cladding ratio is 1.7. The prepared pixel preform has a relatively large core, which can be bound in the core for transmission, effectively suppressing signal crosstalk between pixels and improving image quality. The higher numerical aperture of the pixel preform can ensure sufficient light flux and further improve image quality.

[0071] Step 2, drawing a pixel optical fiber monofilament;

[0072] The fiber drawing tower is used to complete the drawing of the pixel optical fiber, which is divided into three steps: rod hanging, graphite furnace heating, fiber drawing and fiber collection.

[0073] Step 2.1, prefabricated rod hanging:

[0074] During the rod hanging operation, the rod feeding system clamping chuck should be kept clean, dry and rust-free during use; check that the rod feeding control system works normally and is not locked. Insert the lower half of the pixel preform prepared in step 1 into the graphite furnace, and insert the upper part into the three open claws of the rod feeding system chuck. Tighten the disc of the chuck clamping system to tighten the three claws, clamp the preform, and complete the rod hanging.

[0075] Step 2.2, heating the graphite furnace body:

[0076] Before heating the graphite furnace body, the gas in the furnace should be replaced first so that the inert gas argon fills the entire furnace body to avoid oxidation of the furnace body. Set the argon flow rate in the furnace to 10L / min to ensure the positive pressure atmosphere of the furnace body; turn on the cooling water circulation system to ensure that the water flow entering the graphite furnace body is greater than 50L / min. Remove the upper and lower sealing covers of the furnace body, press the up and down keys of the manual control handle of the rod feeding system to extend the preform rod into the graphite furnace 30mm, and reset the preform rod position to zero. Continue to lower the preform rod so that it extends 140mm into the furnace and reaches the heating center of the graphite furnace. Set the graphite furnace temperature to 2150℃. After the main control interface shows that the furnace body temperature has reached 2150℃, the graphite furnace heating is completed.

[0077] Step 2.3, optical fiber drawing and collection;

[0078] When the furnace temperature reaches the set temperature, the head of the pixel preform softens and falls. When it falls out of the lower end of the graphite furnace, the head is cut off, and the rear optical fiber is clamped in the auxiliary traction wheel. The optical fiber is transported to the main traction wheel through the auxiliary traction wheel, and the control switch is pressed to disconnect the auxiliary traction wheel. In the control position of the drawing tower system, the preform feeding speed is adjusted to 1.5-1.8mm / min, the optical fiber drawing speed is 40-45m / min, and the diameter of the pixel optical fiber monofilament is controlled at 130μm. The drawn pixel optical fiber monofilament is wound on the I-shaped wheel to complete the optical fiber drawing and collection.

[0079] In this embodiment, the core diameter of the pixel optical fiber single fiber is 76.5 μm, the outer cladding diameter of the pixel optical fiber single fiber is 130 μm, the fiber diameter fluctuation error is less than ±1 μm, and the optical fiber drawing process does not change the numerical aperture and the core-cladding ratio.

[0080] Step 3, obtaining a light beam rod;

[0081] Step 3.1 cutting pixel monofilament;

[0082] Cut the pixel optical fiber monofilament drawn in step 2 into 50mm lengths, remove the excess debris introduced during the cutting process, rinse repeatedly with high-purity water to remove dust and other impurities, and then rinse with anhydrous ethanol to remove stains on the surface. After cleaning, place the pixel in a vacuum oven to bake to ensure that there is no moisture and ethanol residue. The prepared pixel optical fiber monofilaments are neatly stacked in a dust-free box for use.

[0083] Step 3.2 Liner preparation;

[0084] Use a quartz tube with an outer diameter of 50mm and an inner diameter of 46mm as the liner for the pixel optical fiber monofilament. Dip a dust-free paper in methanol solution and wipe the outer surface of the liner; insert a dust-free paper of appropriate size into the inner wall, wet it with methanol solution, and use a pure nitrogen air gun to blow and clean the liner. After cleaning, use a strong flashlight to illuminate the inner and outer walls of the tube to observe whether there are any impurities remaining. If impurities are observed, repeat the cleaning process and test again until no impurities remain. Complete the cleaning and preparation of the liner.

[0085] Step 3.3: threading and assembling the wire bundle;

[0086] Insert the pixel optical fiber filaments prepared in step 3.1 into the liner prepared in step 3.2 to make a beam-forming light rod. The outer diameter of the liner is 50 mm, the inner diameter is 46 mm, and there are about 100,000 pixel optical fiber filaments in each beam-forming light rod;

[0087] In this embodiment, flushing, purging and testing of the liner tube can effectively remove impurities and dust attached to the tube, keep the inside of the tube clean, and improve the light transmittance of the image-transmitting light rod.

[0088] In this embodiment, during the initial filling, each pixel optical fiber filament remains upright without being folded, bent or entangled. After the initial filling, if there are still pores in the quartz glass tube, the pixel filaments continue to be stuffed into the tube one by one until the gaps in the tube are filled.

[0089] Step 4: The image transmission light rod stretching device stretches the image transmission light rod.

[0090] Fix the beam-forming rod made in step three between the upper chuck 5 and the lower chuck 8. Start the drive motors on the upper chuck 5 and the lower chuck 8 to keep the preform rotating at a constant speed of 30rpm. For the first stretching, align the center of the hydrogen-oxygen flame nozzle 6 with the beam-forming rod, ignite and set the hydrogen flow rate to 100L / min. After the beam-forming rod is completely heated and softened, set the moving speed of the lower chuck screw 3 to 25mm / min, run for 2min, and thin the beam-forming rod to 35.36mm; for the second stretching, align the center of the hydrogen-oxygen flame nozzle 6 with the lower end of the beam-forming rod, ignite and set the hydrogen flow rate to 80L / min. After the beam-forming rod is completely heated and softened, set the moving speed of the lower chuck screw 3 to 50mm / min, set the moving speed of the flame nozzle to 50mm / min, and run for 2min. The beam light rod is thinned to 25mm; after three stretches, the center of the hydrogen-oxygen flame nozzle 6 is aligned with the bottom of the beam light rod, and the hydrogen flow rate is set to 60L / min. After the beam light rod is completely heated and softened, the moving speed of the lower chuck screw 3 is set to 100mm / min, and the moving speed of the flame nozzle is set to 100mm / min, and the operation is performed for 2min. The beam light rod is thinned to 17.68mm; at this time, the total length of the beam light rod is 400mm. After removing it, it is shortened to 100mm and re-clamped between the upper chuck 5 and the lower chuck 8; after four stretches, the center of the hydrogen-oxygen flame nozzle 6 is aligned with the bottom of the beam light rod, and the hydrogen flow rate is set to 40L / min. After the beam light rod is completely heated and softened, the moving speed of the lower chuck screw 3 is set to 100mm / min, and the moving speed of the flame nozzle is set to 50mm / min, and the operation is performed for 2min. The beam-forming light rod is thinned to 12.5mm; stretch it five times, align the center of the hydrogen-oxygen flame nozzle 6 with the lower end of the beam-forming light rod, ignite it and set the hydrogen flow rate to 40L / min. After the beam-forming light rod is completely heated and softened, set the moving speed of the lower chuck screw 3 to 100mm / min, set the moving speed of the flame nozzle to 16mm / min, and run for 12.5min. The beam-forming light rod is thinned to 5mm. The stretching preparation of the image-transmitting light rod is completed. After the preparation is completed, the end face of the image-transmitting light rod is observed through a microscope. The end face diagram, end face local diagram, and pixel detail diagram of the image-transmitting light rod are shown in the figure below. Figure 4 The transmittance of the pixel light rod was tested by a spectrophotometer, and the results are shown in Figure 5 The loss of the pixel light rod in the visible light range is about 0.1dB / m or less, which means that the light rod has a high transmittance in the visible light range.

[0091] Step 5: hot melt shaping;

[0092] The optical imaging light rod prepared by stretching in step 4 is in a straight line shape. If a curve or any curved shape is required, it can be hot-melt bent at the corresponding design position according to design requirements to meet the needs of system integration, wherein the minimum bending radius is 25 mm.

Claims

1. A light-transmitting rod stretching device, characterized in that: The invention comprises a lower base (1), a pair of fixed brackets (2) are fixedly arranged on the lower base (1), an upper base (4) is arranged on the top of the pair of fixed brackets (2), and a lower chuck screw (3) and an oxyhydrogen flame screw (7) are arranged between the lower base (1) and the upper base (4); The lower base (1) is provided with a first servo motor, the output shaft of the first servo motor is vertically upward and a lower chuck screw (3) is fixedly arranged at the end thereof; the upper base (4) is provided with a second servo motor, the output shaft of the second servo motor is vertically downward and a hydrogen-oxygen flame screw (7) is fixedly arranged at the end thereof; The oxyhydrogen flame lead screw (7) is provided with a first connecting plate (9), on which an oxyhydrogen flame nozzle (6) is fixedly provided; the lower chuck lead screw (3) is provided with a second connecting plate (10), at the end of which a lower chuck (8) is provided; the bottom of the upper base (4) is provided with a third connecting plate, at the bottom of which a third upper chuck (5) is provided, and the lower chuck (8) is coaxial with the oxyhydrogen flame nozzle (6) and the upper chuck (5); The structure of the lower chuck (8) and the upper chuck (5) is the same. The lower chuck (8) or the upper chuck (5) comprises a shell (801), a rotating ring (802) coaxially arranged therein is arranged inside the shell (801), a driving motor (803) is arranged in the cavity between the shell (801) and the rotating ring, and the output shaft of the driving motor (803) is threadedly connected to the rotating ring (802); and a retractable preform rod clamping claw (804) is arranged inside the rotating ring (802).

2. A method for preparing a high-resolution image transmission light rod, characterized in that: Based on the image transmission light rod stretching device according to claim 1, the method specifically comprises the following steps: Step 1: fix the deposition tube, feed tube and tail tube on the machine tool of the deposition equipment respectively, set the raw material feeding parameters, deposition temperature and refractive index distribution, and the deposition equipment starts the deposition operation to obtain a prefabricated deposition tube, and burn and shrink the prefabricated deposition tube to obtain a pixel preform rod; Step 2, feeding the pixel preform obtained in step 1 into an optical fiber drawing tower, and the optical fiber drawing tower draws the pixel preform to obtain a pixel optical fiber monofilament; Step 3, cutting, cleaning and drying the pixel optical fiber monofilaments obtained in step 2 in sequence, and inserting a plurality of pixel optical fiber monofilaments into a liner tube to obtain a beam-forming light rod; Step 4: Use the image transmission light rod stretching device described in claim 1 to stretch the single fiber of the image element optical fiber that has been threaded and bundled in step 3 to obtain an image transmission light rod.

3. The method for preparing the high-resolution image transmission light rod according to claim 2, characterized in that: Before step 1, the deposition tube, feed tube and tail tube are cleaned with compressed pure nitrogen.

4. The method for preparing the high-resolution image transmission light rod according to claim 2, characterized in that: The method further includes performing hot-melt bending on the designed position of the image-transmitting light rod obtained in step 4 to obtain a bent image-transmitting light rod.

5. The method for preparing the high-resolution image transmission light rod according to claim 2, characterized in that: In step 1, the deposition raw materials include oxygen, freon, germanium tetrachloride and silicon tetrachloride, and the flow rates thereof range from 3750 to 4850 sccm, 75 to 260 sccm, 150 to 880 sccm, and 1950 to 3650 sccm, respectively.

6. The method for preparing the high-resolution image transmission light rod according to claim 2, characterized in that: In step 1, the deposition temperature is set to 800-1280°C; the sintering temperature of the prefabricated deposition tube is 2100-2250°C.

7. The method for preparing the high-resolution image transmission light rod according to claim 2, characterized in that: In step 2, the pixel preform obtained in step 1 is fed into the optical fiber drawing tower at a speed of 1.5-1.8 mm / min. When the optical fiber drawing tower draws the pixel preform obtained in step 1, the drawing temperature is 2150° C. and the drawing speed is 40-45 m / min.

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