A preparation method of a high-resolution image transmission light rod and an image transmission light rod stretching device

Abstract

The present invention discloses a preparation method of a high-resolution image-transmitting light rod and an image-transmitting light rod stretching device. A deposition tube, a feed tube and a tail tube are respectively fixed on a machine tool of a deposition device. Raw material feeding parameters, deposition temperature and refractive index distribution are set. The deposition device starts a deposition operation to obtain a prefabricated deposition tube. The prefabricated deposition tube is sintered to obtain a pixel preform rod. The obtained pixel preform rod is fed into an optical fiber drawing tower. A pixel preform rod with a high numerical aperture and a large core ratio is used, which can effectively suppress crosstalk between pixel preform rods and achieve clear imaging. Secondly, an optical fiber drawing tower and an image-transmitting light rod stretching device are used to perform 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. It solves the technical problems in the prior art of high loss of image transmission devices, complex preparation process and difficulty in large-scale production and application.

Description

Technical Field

[0001] The invention belongs to the field of advanced optical material preparation, relates to an image transmission light rod, and specifically provides 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 advancement of science and technology, complex electromagnetic environments and high-temperature, high-pressure spaces are becoming increasingly common. Engineering technicians often need to monitor the operation of equipment, the changes in raw materials, and the positioning and observation of intelligent robotic arms in real time under these complex and harsh environments. Traditional imaging systems commonly use sensors such as CCDs and CMOS, and also integrate a large number of electronic components. These components cannot function properly under high-temperature and high-pressure conditions, significantly restricting engineers' precise control and management of equipment, further impacting production safety and efficiency. Meanwhile, equipment and production equipment are moving towards greater integration and simplification, and their size and weight are rapidly decreasing. This increased level of equipment integration places higher demands on individual subsystems and components.

[0003] As an image transmission device, the high-resolution image transmission light rod, due to the properties of its quartz matrix, has a maximum operating temperature of 1500°C and is insensitive to strong magnets. During use, it can transmit real-time images 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. Furthermore, by pre-designing the bending shape, the light rod can be bent into any shape after preparation through hot melt bending to fit the reserved gaps or slots in the device to be embedded, thus enabling image transmission in confined spaces.

[0004] High-resolution image transmission optical rods are made by bundling thousands of pixel filaments together and pulling them together. Each filament is a pixel, and when connected end to end, they transmit the image from the source to the destination. Traditional image transmission optical devices are generally manufactured using an acid etching method. This involves drawing the pixel preform into thin rods, cleaning them, and bundling them. The resulting bundle is then drawn down at high temperature and immersed in a specific acidic solution. The acid etching removes the hard glass quartz coating, leaving only the pixel elements. The acid etching process is difficult to control, resulting in uneven quartz coatings and affecting product quality. Furthermore, due to the limitations of the production process, products produced using this process suffer from high loss, making them unsuitable for long-distance image transmission. This, 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 existing technology, 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 existing technology such as high loss of image transmission devices, complex preparation process, and difficulty in large-scale production and application.

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

[0007] A light-transmitting rod stretching device comprises a lower base, a pair of fixed brackets are fixedly provided on the lower base, an upper base is provided on top of the pair of fixed brackets, and a lower chuck screw and an oxyhydrogen flame screw are provided 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 the 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 the hydrogen-oxygen flame screw is fixedly provided at the end thereof;

[0009] The oxyhydrogen flame screw is provided with a first connecting plate, on which an oxyhydrogen flame nozzle is fixedly provided; the lower chuck 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 includes an outer shell, a rotating ring coaxially distributed therewith is provided inside the outer shell, a driving motor is provided 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 provided inside the rotating ring.

[0011] A method for preparing a high-resolution image-transmitting light rod, based on the image-transmitting light rod stretching device, 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 start the deposition operation of the deposition equipment to obtain a prefabricated deposition tube, which is then sintered to obtain a pixel preform rod;

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

[0014] Step 3: Cut, clean and dry the pixel optical fiber monofilaments obtained in step 2 in sequence, and insert multiple pixel optical fiber monofilaments into the liner tube to obtain a beam rod;

[0015] Step 4: Using the image transmission light rod stretching device, the pixel optical fiber monofilaments that have been threaded and bundled in step 3 are stretched 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 heat-melting 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 their flow rate ranges are 3750-4850 sccm, 75-260 sccm, 150-880 sccm, and 1950-3650 sccm, respectively.

[0020] In step 1, the deposition temperature is set to 800-1280°C; the shrinkage 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 to 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 to 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-transmitting 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, a fiber drawing tower and an image-transmitting light rod stretching device are used to perform two drawing processes. The production process is simple and the process conditions are easy to control. In addition, 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 of high loss of image transmission devices, complex preparation process, and difficulty in large-scale production and application.

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

[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 This is a schematic diagram of the image transmission light rod stretching device;

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

[0028] Figure 3 This is a structural diagram of the end face of the image-transmitting light rod;

[0029] Figure 4 It is a hot melt bending diagram of the image transmission light rod;

[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 imaging 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-oxyhydrogen flame nozzle, 7-oxyhydrogen 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 with reference to the 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 modifications 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 fixedly provided on the lower base 1, an upper base 4 provided on top of the pair of fixed brackets 2, a lower chuck screw 3 and an oxyhydrogen flame screw 7 provided between the lower base 1 and the upper base 4;

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

[0039] A first connecting plate 9 is provided on the oxyhydrogen flame 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 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. The lower chuck 8 is coaxial with the oxyhydrogen flame nozzle 6 and the upper chuck 5;

[0040] The lower chuck 8 has the same structure as the upper chuck 5. The lower chuck 8 or the upper chuck 5 includes a shell 801, and a rotating ring 802 coaxially distributed therewith is provided inside the shell 801. A driving motor 803 is provided 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 provided inside the rotating ring 802.

[0041] The present invention also provides a method for preparing a high-resolution image-transmitting light rod. Based on the image-transmitting light rod stretching device, the method specifically includes 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 start the deposition operation of the deposition equipment to obtain a prefabricated deposition tube, which is then sintered to obtain a pixel preform rod;

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

[0044] Step 3: Cut, clean and dry the pixel optical fiber monofilaments obtained in step 2 in sequence, and insert multiple pixel optical fiber monofilaments into the liner tube to obtain a beam rod;

[0045] Step 4: Using an image transmission light rod stretching device, the image element optical fiber single filaments bundled through the threading in step 3 are stretched 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 crosstalk between the pixel preforms and ensure clear imaging. Secondly, a 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 existing technology 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 tubes clean, and thus ensure the purity of the pixel preform rods.

[0050] The method further includes performing heat-melting 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 their flow rates 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 proportions. The precise control of the air pressure can ensure that the deposition results are consistent with the design values.

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

[0055] In this technical solution, deposition utilizes plasma heating technology to generate high temperatures at localized locations within the deposition tube. This allows the input raw materials to react under high-temperature conditions and deposit on the tube's inner wall. The deposition process is completed through multiple cycles according to designed parameters. Precise control of the equipment ensures that preform parameters meet design requirements. This deposition temperature range allows for the deposition of both a low-refractive-index fluorine layer and a high-refractive-index germanium layer. Collapse at the collapsing temperature yields optimal results for a solid preform.

[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, the wire drawing effect and efficiency are best when the wire drawing temperature is 2150°C and the wire drawing speed is 40-45m / min.

[0058] Example:

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

[0060] Step 1: preparing a pixel preform;

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

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

[0063] Clean the feed tube. Use a dust-free tissue soaked in methanol solution to wipe the outer surface of the feed tube. Insert a dust-free tissue of appropriate size into the inner wall of the feed tube, wet it with methanol solution, and purge the inner surface of the feed tube with a pure nitrogen airgun for 30 seconds. Once clean, set aside. Clean the deposition tube. Clean the inner and outer walls using the same method as in the previous step. After the airgun purge is complete, soak the tube in 45% HF solution for 5 minutes. Once clean, set aside. Use the same method as for cleaning the feed tube to clean the tail pipe and dust removal tube. After cleaning, shine a strong flashlight on the inner and outer walls of the tube to observe for any remaining impurities. If impurities are observed, repeat the cleaning process and retest 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 15mbar, and the flow rates of the deposition raw materials oxygen, freon, germanium tetrachloride, and silicon tetrachloride are set to 3750~4850sccm, 75~260sccm, 150~880sccm, and 1950~3650sccm, respectively.

[0065] Step 1.2, deposition and sintering;

[0066] The preform is deposited using a plasma vapor deposition process. The deposition temperature is set between 800°C and 1280°C, and plasma vapor deposition is performed according to the designed refractive index profile. The equipment system automatically operates according to the set values, and through multiple deposition cycles, a prefabricated deposition tube is obtained. After deposition is completed, the prefabricated deposition tube is sintered at a temperature between 2100°C and 2250°C to produce the pixel preform.

[0067] In this embodiment, flushing and purging of various material tubes can effectively remove impurities and dust attached to the tubes, keep 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 precisely control the flow rate of the raw materials, ensuring that all raw materials are accurately mixed according to the set ratio. The precise control of the gas pressure ensures that the deposition results are consistent with the designed value.

[0069] In this embodiment, deposition utilizes plasma heating technology to generate high temperatures at localized locations within the deposition tube. This allows the input raw materials to react and deposit on the tube's inner wall under these high-temperature conditions. The deposition process is completed through multiple cycles according to designed parameters. Precise control of the equipment ensures that preform parameters meet design requirements.

[0070] In this embodiment, the pixel preform produced has a numerical aperture of 0.38 to 0.41, a core diameter of 11.85 mm, a cladding diameter of 20.15 mm, and a core-to-cover ratio of 1.7. The relatively large core of the prepared pixel preform allows for transmission of the bundle within the fiber core, effectively suppressing signal crosstalk between pixels and improving image quality. The high numerical aperture of the pixel preform ensures sufficient light flux, further enhancing image quality.

[0071] Step 2: drawing pixel optical fiber monofilament;

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

[0073] Step 2.1, prefabricated rod hanging:

[0074] During rod hanging, the rod feeding system's clamping chuck should be kept clean, dry, and free of rust. Check that the rod feeding control system is functioning properly and is not stuck. Insert the lower half of the pixel preform prepared in step 1 into the graphite furnace and the upper half into the three open jaws of the rod feeding system's chuck. Tighten the chuck's clamping system disc to tighten the three jaws, securing the preform and completing 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 a positive pressure atmosphere in 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 on 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 displays that the furnace body temperature has reached 2150℃, the graphite furnace heating is completed.

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

[0078] When the furnace reaches the set temperature, the preform head softens and falls. Once it emerges from the bottom of the graphite furnace, the head is sheared off, and the fiber at its rear end is clamped in an auxiliary pulley. The auxiliary pulley then conveys the fiber to the main pulley, which is then disconnected by pressing a control switch. The preform feed speed is adjusted to 1.5-1.8 mm / min and the fiber drawing speed to 40-45 m / min on the drawing tower system control panel, maintaining the diameter of the pixel fiber monofilament at 130 μm. The drawn pixel fiber monofilament is then wound around the spool, completing the fiber drawing and reeling process.

[0079] In this embodiment, the core diameter of the prepared pixel optical fiber monofilament is 76.5μm, the outer cladding diameter of the pixel optical fiber monofilament is 130μm, the fiber diameter fluctuation error is less than ±1μm, 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 any excess fiber debris introduced during the cutting process. Rinse repeatedly with high-purity water to remove dust and other impurities, then rinse with anhydrous ethanol to remove any surface stains. After cleaning, bake the pixel in a vacuum oven to remove any residual moisture or ethanol. Neatly stack the prepared pixel optical fiber monofilaments in a dust-free box for later use.

[0083] Step 3.2 Liner preparation;

[0084] A quartz tube with an outer diameter of 50 mm and an inner diameter of 46 mm serves as the liner for the pixel optical fiber monofilament. Wipe the outer surface of the liner with a dust-free tissue soaked in methanol solution. Insert a suitable size of dust-free tissue into the inner wall and wet it with methanol solution. Use a pure nitrogen air gun to purge and clean the liner. After cleaning, shine a strong flashlight on the inner and outer walls of the tube to observe for any remaining impurities. If impurities are observed, repeat the cleaning process and retest until no impurities remain. This completes the cleaning and preparation of the liner.

[0085] Step 3.3: threading the wire bundle;

[0086] Insert the pixel optical fiber filaments prepared in step 3.1 into the liner tube prepared in step 3.2 to make a beam-forming light rod. The liner tube has an outer diameter of 50 mm and an inner diameter of 46 mm. Each beam-forming light rod contains approximately 100,000 pixel optical fiber filaments.

[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 and unbent, uncurled, and unentangled. After the initial filling, if there are still pores in the quartz glass tube, the pixel filaments are continuously inserted into the tube one by one until the pores 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 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 rod, ignite and set the hydrogen flow rate to 100L / min. After the beam rod is completely heated and softened, set the moving speed of the lower chuck screw 3 to 25mm / min, run for 2min, and draw the beam 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 rod, ignite and set the hydrogen flow rate to 80L / min. After the beam 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 rod is thinned to 25mm; after three stretches, the center of the hydrogen-oxygen flame nozzle 6 is aligned with the lowest end of the beam rod, and the hydrogen flow rate is set to 60L / min. After the beam rod is completely heated and softened, the movement speed of the lower chuck screw 3 is set to 100mm / min, and the movement speed of the flame nozzle is set to 100mm / min, and the operation is continued for 2 minutes. The beam rod is thinned to 17.68mm; at this time, the beam rod has a total length of 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 lowest end of the beam rod, and the hydrogen flow rate is set to 40L / min. After the beam rod is completely heated and softened, the movement speed of the lower chuck screw 3 is set to 100mm / min, and the movement speed of the flame nozzle is set to 50mm / min, and the operation is continued for 2 minutes. The beam light rod is thinned to 12.5mm; after five stretches, the center position of the hydrogen-oxygen flame nozzle 6 is aligned with the lower end of the beam light rod, ignited 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 16mm / min, and the operation is carried out for 12.5min. The beam light rod is thinned to 5mm. The stretching preparation of the image transmission light rod is completed. After the preparation is completed, the end face of the image transmission light rod is observed through a microscope. The end face diagram, the local diagram of the end face, and the pixel detail diagram of the image transmission light rod are shown as follows: Figure 4 The transmittance of the pixel light rod was tested using a spectrophotometer, and the results are as follows: Figure 5 The pixel transmission light rod has a loss of less than 0.1dB / m in the visible light range, indicating that the light rod has a high transmittance in the visible light range.

[0091] Step 5: hot melt shaping;

[0092] The optical imaging 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. The minimum bending radius is 25mm.

Claims

1. A method for preparing a high-resolution image-transmitting light rod, characterized in that: Based on an image transmission light rod stretching device, the image transmission light rod stretching device comprises a lower base (1), a pair of fixed brackets (2) are fixedly provided on the lower base (1), an upper base (4) is provided on the top of the pair of fixed brackets (2), and a lower chuck screw (3) and an oxyhydrogen flame screw (7) are provided 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 provided 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 provided at the end thereof; The oxyhydrogen flame lead screw (7) is provided with a first connecting plate (9), and the oxyhydrogen flame nozzle (6) is fixedly provided on the first connecting plate; the lower chuck lead screw (3) is provided with a second connecting plate (10), and the end of the second connecting plate is provided with a lower chuck (8); the bottom of the upper base (4) is provided with a third connecting plate, and the bottom of the third connecting plate (11) is provided with a third upper chuck (5), and the lower chuck (8) is coaxial with the oxyhydrogen flame nozzle (6) and the upper chuck (5); The lower chuck (8) and the upper chuck (5) have the same structure. The lower chuck (8) or the upper chuck (5) comprises a housing (801), a rotating ring (802) coaxially arranged therewith is provided in the housing (801), a driving motor (803) is provided in the cavity between the housing (801) and the rotating ring, and an output shaft of the driving motor (803) is threadedly connected to the rotating ring (802); a retractable preform rod clamping claw (804) is provided inside the rotating ring (802); 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 start the deposition operation of the deposition equipment to obtain a prefabricated deposition tube, which is then sintered to obtain a pixel preform rod; Step 2: feeding the pixel preform obtained in step 1 into a fiber drawing tower, which draws the pixel preform to obtain a pixel optical fiber monofilament; Step 3: Cut, clean and dry the pixel optical fiber monofilaments obtained in step 2 in sequence, and insert multiple pixel optical fiber monofilaments into the liner tube to obtain a beam rod; Step 4: Using the image transmission light rod stretching device, the pixel optical fiber monofilaments that have been threaded and bundled in step 3 are stretched to obtain an image transmission light rod.

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

3. The method for preparing a high-resolution image-transmitting light rod according to claim 1, wherein: The method further includes performing heat-melting bending on the designed position of the image-transmitting light rod obtained in step 4 to obtain a bent image-transmitting light rod.

4. The method for preparing a high-resolution image-transmitting light rod according to claim 1, wherein: In step 1, the deposition raw materials include oxygen, freon, germanium tetrachloride and silicon tetrachloride, and their flow rates range from 3750 to 4850 sccm, 75 to 260 sccm, 150 to 880 sccm, and 1950 to 3650 sccm, respectively.

5. The method for preparing a high-resolution image-transmitting light rod according to claim 1, wherein: In step 1, the deposition temperature is set to 800-1280°C; the shrinkage temperature of the prefabricated deposition tube is 2100-2250°C.

6. The method for preparing a high-resolution image-transmitting light rod according to claim 1, wherein: In step 2, the pixel preform obtained in step 1 is fed into the optical fiber drawing tower at a speed of 1.5 to 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 to 45 m / min.

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