Copper-silver alloy, copper-silver alloy-plated optical fiber, optical fiber panel, and preparation method and application thereof

Abstract

The present invention discloses a copper-silver alloy, a copper-silver alloy-coated optical fiber, an optical fiber panel, and their preparation methods and applications. The copper-silver alloy has a combined copper and silver content of ≥99.995 wt%, and a silver content of 92 wt% to 95 wt%. The technical problem to be solved is to significantly enhance the optical crosstalk and electromagnetic interference resistance of the optical fiber panel by using the optical fiber monofilament coated with the copper-silver alloy layer, thereby achieving high-resolution imaging of the optical fiber panel that is resistant to optical crosstalk and high-frequency electromagnetic pulses.

Description

Technical Field

[0001] The invention belongs to the technical field of ICCD / ICOMS coupled imaging element preparation, and particularly relates to a copper-silver alloy, a copper-silver alloy-plated optical fiber, an optical fiber panel, and a preparation method and application thereof. Background Art

[0002] Fiber optic panels are fiber array imaging materials made by melting and pressing tens of thousands of optical fibers at high temperatures. They feature high light transmission efficiency, minimal interstage coupling loss, clear and accurate images, and zero thickness. However, when operating in strong electromagnetic fields, electromagnetic radiation can affect the accuracy and stability of image transmission, leading to errors in measurement data. High-frequency electromagnetic pulses can even directly damage optical devices such as cameras.

[0003] Currently, in traditional fiber optic panels, due to the close arrangement of optical fibers, crosstalk occurs between adjacent fibers during optical signal transmission. This crosstalk can cause optical signals to leak into other channels, affecting communication quality. Especially over long distances, inter-core crosstalk is a major factor limiting transmission efficiency. Effectively reducing crosstalk between fibers and improving the quality and efficiency of optical fiber communications is a pressing technical challenge facing fiber optic panels. Summary of the Invention

[0004] In view of this, the main purpose of the present invention is to provide a copper-silver alloy, a copper-silver alloy-plated optical fiber, an optical fiber panel, and a preparation method and application thereof. The technical problem to be solved is to use an optical fiber monofilament plated with a copper-silver alloy layer for the preparation of an optical fiber panel, so that the anti-light crosstalk and anti-electromagnetic interference capabilities of the prepared optical panel are significantly improved, thereby achieving high-resolution imaging of the optical fiber panel that is anti-light crosstalk and anti-high-frequency electromagnetic pulses.

[0005] The objectives of the present invention and the technical problems solved therein are achieved by adopting the following technical solutions: The present invention provides a copper-silver alloy, wherein the sum of the copper and silver contents in the copper-silver alloy is ≥ 99.995 wt %, and the silver content is 92 wt % to 95 wt %.

[0006] The objectives and technical problems solved by the present invention can be further achieved by adopting the following technical measures.

[0007] Preferably, the aforementioned copper-silver alloy, wherein the oxygen content in the copper-silver alloy is <5ppm, the sum of the contents of iron, nickel, sulfur and phosphorus is ≤8ppm, and the sum of the contents of other impurities is ≤6ppm.

[0008] The purpose of the present invention and the technical problem solved are achieved by adopting the following technical solutions. The present invention proposes a method for preparing a copper-silver alloy, comprising the following steps:

[0009] The alloy composition and corresponding proportions are determined according to the sum of the copper and silver contents in the copper-silver alloy being ≥99.995wt%, and the silver content being 92wt% to 95wt%. The corresponding elemental metal material is selected as a raw material, the metal raw material is pretreated, and the pretreated metal raw material is heated to 780°C to 800°C while stirring until the metal is completely melted and evenly mixed, thereby obtaining the copper-silver alloy.

[0010] The purpose of the present invention and the solution to its technical problems can also be achieved by adopting the following technical measures. The present invention proposes a method for preparing a copper-silver alloy-coated optical fiber, comprising the following steps:

[0011] S1 draws the optical fiber preform into optical fiber bare wire;

[0012] S2: Coating the copper-silver alloy on the surface of the bare optical fiber to form an optical fiber monofilament with a copper-silver alloy coating, and collecting the optical fiber monofilament to obtain the copper-silver alloy-coated optical fiber.

[0013] The objectives of the present invention and the technical problems solved therein can also be achieved by the following technical measures. The present invention provides a copper-silver alloy-coated optical fiber comprising, from the inside out, an optical fiber core layer, an optical fiber sheath, and a copper-silver alloy coating. In the copper-silver alloy coating, the oxygen content is less than 5 ppm, the sum of the iron, nickel, sulfur, and phosphorus contents is ≤8 ppm, and the sum of the remaining impurities is ≤6 ppm, measured by weight.

[0014] The objectives of the present invention and the solution to its technical problems can also be achieved by adopting the following technical measures. The present invention proposes a high-transmittance, crosstalk-proof, and electromagnetic pulse-resistant optical fiber panel, wherein the optical fiber portion includes a plurality of copper-silver alloy-plated optical fibers, which are composed of an optical fiber core layer, an optical fiber sheath, and a copper-silver alloy coating from the inside out, with light-absorbing filaments and interstitial filaments inserted between different copper-silver alloy-plated optical fibers; in terms of weight percentage, the oxygen content in the copper-silver alloy coating is less than 5ppm, the sum of the iron, nickel, sulfur, and phosphorus contents is ≤8ppm, and the sum of the contents of other impurities is ≤6ppm.

[0015] The purpose of the present invention and the solution to its technical problems can also be achieved by adopting the following technical measures. The present invention proposes a method for preparing a high-transmittance, crosstalk-proof and electromagnetic pulse-resistant optical fiber panel, comprising the following steps:

[0016] a. Put the leather tube on the core rod to make an optical fiber preform;

[0017] b. melting the optical fiber preform obtained in step a into an optical fiber monofilament, and performing a metal coating process to coat the outer surface with a metal coating to produce a metal-coated optical fiber monofilament;

[0018] c. Drawing the black absorption rod into a light-absorbing monofilament, and arranging the metal-coated optical fiber monofilaments obtained in step b in a hexagonal close-packed manner, and uniformly filling the light-absorbing filaments in the gaps of the metal-coated optical fiber monofilaments to obtain a primary composite rod, and drawing the primary composite rod into a primary fiber filament;

[0019] d. Arranging a plurality of primary fiber filaments in a hexagonal close-packed arrangement, and inserting light-absorbing filaments in a certain pattern into the gaps formed by the hexagonal close-packed arrangement of the plurality of primary fiber filaments to obtain a primary composite rod; drawing the primary composite rod into a primary multifilament; regularly cutting the primary multifilament, arranging the hexagonal close-packed arrangement, and bundling to obtain a secondary composite rod; drawing the secondary composite rod into a secondary multifilament; regularly cutting the secondary multifilament, arranging the hexagonal close-packed arrangement, and bundling to obtain a secondary multifilament rod;

[0020] e. Drawing the secondary multifilament rod obtained in step d at 658-668° C. to obtain a molten fiber bundle; cutting it to a fixed length and then mechanically cold working it to obtain a cylindrical blank; optically finishing and optically polishing the blank to obtain the optical fiber panel with high transmittance, anti-crosstalk and anti-electromagnetic pulse.

[0021] The objectives and technical problems solved by the present invention can be further achieved by adopting the following technical measures.

[0022] Preferably, in the aforementioned method for preparing a high-transmittance, crosstalk-proof and electromagnetic pulse-resistant optical fiber panel, in step a, the refractive index of the leather tube at a wavelength of 532 nm is 1.50-1.51, and the refractive index of the core rod at a wavelength of 532 nm is 1.80-1.81.

[0023] Preferably, in the aforementioned method for preparing a high-transmittance, crosstalk-proof and electromagnetic pulse-resistant optical fiber panel, in step c, the primary composite rod comprises a metal-plated fiber monofilament and a light-absorbing filament; and the black absorption rod is made of glass with an absorption coefficient of greater than 0.95 in the wavelength range of 500 to 600 nm.

[0024] The purpose of the present invention and the solution to its technical problems can also be achieved by adopting the following technical measures: The present invention proposes an image-intensified CCD camera, which includes the above-mentioned high-transmittance, crosstalk-proof and electromagnetic pulse-resistant optical fiber panel.

[0025] The purpose of the present invention and the solution to its technical problems can also be achieved by adopting the following technical measures: The present invention proposes an image-intensified CMOS camera, which includes the above-mentioned high-transmittance, crosstalk-proof and electromagnetic pulse-resistant optical fiber panel.

[0026] Compared with the prior art, the copper-silver alloy, copper-silver alloy-plated optical fiber, optical fiber panel, and preparation method and application thereof of the present invention have the following beneficial effects:

[0027] The present invention provides a method for preparing an optical fiber panel with high transmittance, anti-crosstalk and anti-electromagnetic pulse by metal plating on the outer surface of the optical fiber. The optical fiber raw material is directly prepared into optical fiber filaments, and a molten metal coating process is adopted to prepare the metal-plated optical fiber filaments, so that a metal coating with a certain thickness is formed on the outer surface of the optical fiber. The method reduces the generation of stray light when a single optical fiber transmits a signal, and reduces the optical crosstalk of the weaker adjacent optical fiber to the optical fiber during the transmission process, thereby achieving high transmittance, high precision and high resolution transmission of image signals, improving the absorption capacity and anti-interference ability of the optical fiber panel to high-frequency electromagnetic pulses, maintaining the normal operation of the optical fiber panel in a strong magnetic field environment, and enhancing the stability of the image transmission of the optical fiber panel, thereby ensuring the accuracy and resolution of the signal transmission of the optical fiber panel.

[0028] The present invention uses the optical fiber monofilament plated with the copper-silver alloy layer for the preparation of an optical fiber panel. The prepared optical fiber panel has significantly improved anti-optical crosstalk and anti-electromagnetic interference capabilities, thereby achieving high-resolution imaging of the optical fiber panel that is anti-optical crosstalk and resistant to high-frequency electromagnetic pulses.

[0029] The present invention provides a method for preparing a fiber optic panel with high transmittance, anti-crosstalk, and resistance to electromagnetic pulses. The method involves applying a metal coating on the outer surface of the optical fiber to prepare a high-transmittance fiber optic panel that can effectively prevent optical crosstalk and resist high-frequency electromagnetic pulses. First, the optical fiber raw material is processed into optical fiber filaments, and then a molten metal coating process is used to form a uniform metal coating with a certain thickness on the outer surface of the optical fiber filament. This process significantly reduces the generation of stray light during signal transmission and reduces the optical crosstalk of adjacent optical fibers to the target optical fiber, thereby achieving high transmittance, high precision and high-resolution transmission of image signals. In addition, the method enhances the absorption and anti-interference ability of the optical fiber panel to high-frequency electromagnetic pulses, ensures the normal operation of the optical fiber panel in a strong magnetic field environment, improves the stability of image transmission, and thus ensures the overall accuracy and resolution of the equipment. The optical fiber panel is prepared using an optical fiber monofilament plated with a copper-silver alloy layer, which significantly improves the panel's anti-optical crosstalk and anti-electromagnetic interference performance, and achieves high-resolution image transmission of the high-frequency electromagnetic pulse resistant optical fiber panel;

[0030] The present invention provides a high-transmittance, crosstalk-proof, and electromagnetic pulse-resistant optical fiber panel. The copper-silver alloy coating has a refractive index of 1.28 to 1.31 at a wavelength of 532 nm, a transmittance of 72.48% to 72.67% at a wavelength of 532 nm, a reflectivity of 87% to 89% at a wavelength of 532 nm, a conductivity of 98.4% to 99.0% IACS, and a coating elongation of 30% to 31%. The shielding effectiveness can reach 84dB to 86dB under a test environment where the electromagnetic wave radiation intensity is 10 V / m and the radiation frequency test fluctuation range is 80 MHz to 1 GHz. This ensures that the manufactured optical fiber panel has high anti-interference performance.

[0031] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the structure of the copper-silver alloy optical fiber preparation system of the present invention;

[0033] Figure 2 Schematic cross-sectional view of the optical fiber panel with high transmittance, crosstalk prevention and electromagnetic pulse resistance of the present invention;

[0034] Figure 3 This is a process flow chart for preparing a high-transmittance, crosstalk-proof and electromagnetic pulse-resistant optical fiber panel of the present invention;

[0035] Figure 4 This is a schematic diagram of the anti-electromagnetic interference principle of the copper-silver alloy coating of the present invention;

[0036] Among them, 1-preform rod; 2-optical fiber former; 3-annealing tube; 4-caliper tube; 5-metal coating device; 6-optical fiber collection device; 7-filling wire; 8-copper-silver alloy coating; 9-light absorbing wire; 10-optical fiber core layer; 11-optical fiber sheath; 12-internal absorption wave; 13-electromagnetic pulse incident wave; 14-optical fiber filament; 15-reflected wave; 16-transmitted wave; 17-internal multiple reflection wave; 18-copper-silver alloy coating. DETAILED DESCRIPTION

[0037] To further illustrate the technical means and effectiveness of the present invention in achieving its intended objectives, the following, in conjunction with preferred embodiments, describes in detail the copper-silver alloy, copper-silver alloy-plated optical fiber, optical fiber faceplate, and its preparation method and application, as well as its specific implementation, structure, features, and effectiveness. In the following description, different references to "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0038] Unless otherwise specified, the materials and reagents mentioned below are all commercially available products familiar to those skilled in the art; unless otherwise specified, the methods described are all methods well known in the art. Unless otherwise defined, technical or scientific terms used should have the same meanings as those of ordinary skill in the art. Where specific experimental procedures or conditions are not specified below, the procedures or conditions described in the literature in this field can be followed.

[0039] Ordinary optical fiber is directly made by heating the optical fiber preform rod in a high-temperature furnace to the softening drawing temperature and drawing it into a single wire. Since the refractive index of the core layer of the optical fiber is large and the refractive index of the cortex is small, during the transmission of the optical signal, some light is not totally reflected in the core layer. After penetrating the core layer and entering the cortex, it will cause crosstalk to the remaining optical fibers, seriously affecting the resolution and clarity of the imaging. At the same time, when working in a strong electromagnetic field environment, electromagnetic radiation has a certain impact on the accuracy and stability of the image transmission, causing errors in the measurement data. High-frequency electromagnetic pulses can even directly damage optical devices such as cameras and panels. Therefore, it is necessary to adjust and design the structure of the optical fiber accordingly, such as Figure 1 A copper-silver alloy-coated optical fiber is shown in FIG. By coating a thin layer of copper-silver alloy on the drawn primary wire, an optical fiber primary wire with a copper-silver alloy coating is produced. The copper-silver alloy coating can effectively reduce the light transmission of the optical fiber, isolate, discharge, reflect and absorb the electromagnetic pulse energy, and attenuate it to a strength that electronic information equipment can withstand, thereby improving the optical fiber panel's ability to absorb high-level electromagnetic pulses and its anti-interference ability. Figure 4 As shown. After the electromagnetic pulse incident wave 13 reaches the copper-silver alloy coating 18, most of it will be reflected by the copper-silver alloy coating 18, forming a reflected wave 15. Another part enters the copper-silver alloy coating 18 and is absorbed by the copper-silver alloy coating 18, forming an internal absorption wave 12. Of the electromagnetic pulse signal that is not absorbed, a part enters the optical fiber filament 14, forming a transmitted wave 16, and another part forms an internal multiple reflection wave 17 inside the copper-silver alloy coating 18, which is reflected multiple times within the copper-silver alloy coating 18 and transmitted in the direction of the copper-silver alloy coating 18. The present invention solves the existing problems of optical crosstalk and electromagnetic interference in the structural unit. Optical devices made of optical fiber filaments coated with copper-silver alloy can achieve high transmittance, high resolution, and high-definition image transmission of optical devices, and are resistant to high-frequency electromagnetic pulse interference.

[0040] In fact, currently mass-produced, ordinary fiber optic panels rely solely on light-absorbing glass to absorb stray light and improve image resolution. However, during actual signal transmission, some stray light remains unabsorbed, necessitating further adjustments to the optical structure. Since the copper-silver alloy coating on the exterior of the optical fiber monofilament significantly limits the transmission of light signals from within the fiber, applying a copper-silver alloy coating to the exterior surface of the optical fiber monofilament during production significantly limits the overflow of light signals, improving transmission efficiency and enhancing the fiber optic panel's ability to absorb high-level electromagnetic pulses and resist interference.

[0041] To this end, some embodiments of the present invention provide a copper-silver alloy, wherein the sum of the copper and silver contents in the copper-silver alloy is ≥99.995wt% by weight. Excessively low purity of the copper-silver alloy causes uncertain fluctuations in the melting point and softening temperature range of the alloy. Furthermore, the silver content is between 92wt% and 95wt%. When the silver content is less than 92wt% or greater than 95wt%, either too low or too high a silver content in the copper-silver alloy will cause the alloy's melting point to exceed 780°C, resulting in insufficient heating furnace temperature to completely melt the alloy. Alternatively, increasing the melting temperature will cause the high-temperature molten alloy to soften the optical fiber filament during coating, hindering the preparation of coated optical fiber. Furthermore, the oxygen content is <5ppm, the sum of the iron, nickel, sulfur, and phosphorus contents is ≤8ppm, and the sum of the remaining impurities is ≤6ppm. Impurity content must be controlled within a relatively low range; excessively high content is detrimental to the stability of the alloy's properties. The preferred copper-silver alloy composition is shown in Table 1.

[0042] Table 1

[0043]

[0044] The above-mentioned coating metal has a melting point of 760-780°C, a softening temperature of approximately 500°C, a conductivity of ≥98.4% IACS, a coating elongation of ≥30%, a refractive index of 1.2-1.5, and a reflectivity of approximately 80-90%. The high conductivity ensures that the copper-silver alloy coating has excellent electromagnetic interference resistance, while the excellent coating elongation effectively ensures uniform adhesion to the optical fiber monofilament during the subsequent preparation of primary and secondary filaments, thereby improving the copper-silver alloy coating's structural uniformity.

[0045] Some embodiments of the present invention further provide a method for preparing the copper-silver alloy, comprising the following steps:

[0046] 101. Determine the alloy composition and the corresponding proportion according to the above alloy ratio range; select the corresponding elemental metal material as the raw material, and accurately weigh the selected elemental metal to ensure that the proportion of each metal is accurate.

[0047] 102. Pre-process the metal raw material as necessary to prevent excessive particle size and remove oil, impurities, and moisture, including but not limited to degreasing, drying, and cutting. The degreasing, drying, and cutting steps are based on existing techniques, and their specific steps are not detailed here.

[0048] 103. Place the pretreated metal material into a heating furnace, turn on the furnace, and heat the metal material to 780-800°C until the metal is completely melted. Temperatures below 780°C will result in incomplete melting of the metal material, while temperatures above 800°C will soften the optical fiber filaments, affecting the subsequent formation of the metal coating on the optical fiber filaments. During the heating process, stir the molten metal material at a speed of 150-300 r / min to ensure uniform mixing of the metal until the metal is completely dissolved and evenly distributed.

[0049] Some embodiments of the present invention also provide a method for preparing a fiber optic panel with high transmittance, crosstalk resistance, and electromagnetic pulse resistance, wherein the fiber optic panel is made of tens of millions or even hundreds of millions of micron-sized metal-coated fiber filaments through a specific process. The fiber filaments are composed of a fiber core, a cladding, and an external metal coating. Each fiber independently transmits a pixel from the input end to the output end; Figure 3 As shown, the following steps are included:

[0050] 201. Prepare the leather tube and the core rod into an optical fiber preform, and draw the optical fiber monofilament.

[0051] The step of preparing the optical fiber monofilament includes: selecting a core rod and a rubber tube of suitable size, and sleeve the primary rubber tube onto the primary core rod, wherein the refractive index of the optical fiber sheath at a wavelength of 532 nm is 1.50 to 1.51; and the refractive index of the optical fiber core at a wavelength of 532 nm is 1.80 to 1.81;

[0052] 202, drawing the optical fiber preform into a bare optical fiber.

[0053] The optical fiber preform is heated in a graphite furnace to 810-820°C to fully soften it. Once the preform in the graphite furnace reaches a softened state, it is drawn into optical fiber monofilaments. To ensure high uniformity of the drawn optical fiber monofilaments, a drawing speed of approximately 10-14 m / min is optimal, resulting in uniform diameters of the drawn optical fiber monofilaments. Excessively high or low speeds can affect the uniformity of the optical fiber monofilaments, and poor monofilament uniformity can directly reduce the transmittance of the optical fiber panel.

[0054] 203. Then, a copper-silver alloy is coated on the surface of a bare optical fiber to form an optical fiber monofilament with a coating metal, and the coated optical fiber monofilament is collected by a fiber collecting device to obtain the copper-silver alloy-coated optical fiber; the copper-silver alloy-coated optical fiber comprises, from the inside to the outside, an optical fiber core layer 10, an optical fiber sheath 11, and a copper-silver alloy coating 8; wherein, the optical fiber sheath 11 has a refractive index of 1.50 to 1.51 at a wavelength of 532 nm; the optical fiber core layer 10 has a refractive index of 1.80 to 1.81 at a wavelength of 532 nm; the copper-silver alloy coating 8 has a thickness of ≥18 μm, a refractive index of 1.2 to 1.5 at a wavelength of 532 nm, a reflectivity of approximately 80 to 90% at a wavelength of 532 nm, and a transmittance of 72% to 73% at a wavelength of 532 nm.

[0055] Among them, such as Figure 1 As shown, the copper-silver alloy-plated optical fiber preparation system of the present invention includes an optical fiber former 2, an annealing tube 3, a caliper tube 4, a metal coating device 5 and an optical fiber collecting device 6 arranged in sequence from top to bottom; the preform rod 1 is fed from directly above the optical fiber former 2 and drawn into an optical fiber monofilament of 2.00 to 2.05 mm at 800 to 820°C, and then cooled to room temperature through the annealing tube 3 directly below the optical fiber former 2, and then the diameter is measured and verified through the optical fiber caliper tube 4 directly below the annealing tube 3, and then the cooled and shaped optical fiber monofilament is introduced into the metal coating device 5 for metal coating; after the coating is completed, the coated optical fiber monofilament is collected by the optical fiber collecting device 6 below the metal coating device 5. The specific process of the metal coating is as follows: the copper-silver alloy particles in the metal coating device 5 are heated to above the melting point (the melting point of the alloy is 760-780°C), and then the prepared bare optical fiber (i.e., optical fiber monofilament) is introduced into the metal coating device 5 to start coating the bare optical fiber. The coating temperature is 780-800°C, so as to form a uniform metal coating on the outside of the optical fiber monofilament. The thickness of the metal coating is ≥18μm. The 18μm thick metal coating can ensure that the manufactured optical fiber panel has high anti-interference performance and effectively control the preparation cost of the optical fiber panel. The coated optical fiber filaments are collected by a fiber collection device. The copper-silver alloy coating on the outside of the optical fiber monofilament has a refractive index of 1.2-1.5 at a wavelength of 532nm, a reflectivity of about 80-90% at a wavelength of 532nm, and a transmittance of 72%-73% at a wavelength of 532nm, which can effectively reduce the crosstalk between optical fiber monofilaments. Under the test environment where the radiation intensity of electromagnetic waves is 10V / m and the radiation frequency test fluctuation range is 80MHz~1GHz, the shielding effectiveness can reach 84dB~86dB.

[0056] 204. The black absorption rod is drawn into a light-absorbing monofilament, the metal-plated optical fiber monofilaments are arranged in a hexagonal close-packed manner, and the light-absorbing filaments are uniformly filled in the gaps of the metal-plated optical fiber monofilaments to obtain a primary composite rod, which is then drawn into a primary fiber filament (hereinafter referred to as a primary filament).

[0057] The primary composite rod in this step includes metal-plated fiber monofilaments and light-absorbing fibers. The black absorption rod is made of glass with good light absorption performance, and the absorption coefficient in the 500-600nm band reaches above 0.95.

[0058] 205. Multiple primary filaments are arranged in a hexagonal close-packed pattern, and light-absorbing single filaments are inserted into the gaps formed by the hexagonal close-packed arrangement according to a specific pattern. To ensure the transmittance of the optical fiber faceplate, a design is used based on coordination relationships, with one light-absorbing filament shared by every two fiber cores. This results in a primary composite rod with an opposite-side dimension of 27-30 mm. A high-precision optical fiber forming machine is used to heat and draw the pre-drawn piece, achieving a wire diameter drawing accuracy of ≤1 μm. This primary composite rod is drawn at 760-780°C into a primary multifilament with an opposite-side dimension of 1.2-1.5 mm. The primary multifilament is then cut regularly, arranged in a hexagonal close-packed pattern, and bundled to form a secondary composite rod with an opposite-side dimension of 27-30 mm. This secondary composite rod is then drawn at 760-780°C into a secondary multifilament with an opposite-side dimension of 1.2-1.5 mm.

[0059] Both the primary composite rod and the secondary composite rod have a regular hexagonal structure. During the steps of bundling multiple monofilaments in a hexagonal closest-packed arrangement to form a primary composite rod and the steps of bundling multiple primary composite filaments in a hexagonal closest-packed arrangement to form a secondary composite rod, the multiple monofilaments or primary filaments are regularly cut and arranged in a regular hexagonal mold. After the arrangement is completed, the rods are bundled to form the primary composite rod or the secondary composite rod. The drawing temperature is 760-785°C. This temperature range ensures good ductility for the optical fiber monofilaments, primary multifilaments, and secondary multifilaments, facilitating wire drawing and melt pressing. It also effectively balances the good ductility of the metal coating without destroying the layer structure of the metal coating. Furthermore, the primary multifilaments, secondary multifilaments, and the optical fiber monofilament coating in the blank also have high uniformity, enabling better isolation of optical crosstalk signals and absorption of strong electromagnetic interference, thereby improving the image transmission and anti-interference capabilities of the optical fiber panel.

[0060] After the secondary multifilaments are laid out, they are placed in a high-precision fiber forming machine and drawn at 658-668°C to produce molten fiber bundles, based on the pixel size and overall dimensions of the optical fiber panel. Based on the required panel thickness, the fibers are cut to length and then mechanically cold-worked to produce cylindrical blanks.

[0061] Among them, the melting temperature of the secondary multifilament is adjusted to 658-668℃ ， Low-temperature melting and pressing within this temperature range significantly reduces the interlayer structural damage of the metal coating caused by high temperatures, while maintaining a high degree of uniformity in the coating of the primary and secondary multifilaments, as well as the optical fiber monofilaments in the blank. This structural uniformity helps to more effectively isolate optical crosstalk signals, absorb strong electromagnetic interference, and enhance the imaging transmission performance and anti-interference capabilities of the optical fiber panel. Temperatures above 668°C will increase the degree of coating damage, while temperatures below 658°C will prevent the panel from being fixed and formed.

[0062] 207. Use a precision engraving machine to perform optical finishing on the shape of the embryonic plate. After determining the central optical axis of the embryonic plate, process the input and output end faces of the embryonic plate.

[0063] The input and output end faces are optically polished by using a machining center, and the optical surface roughness after polishing is controlled within 30 nm to obtain the optical fiber panel.

[0064] Some embodiments of the present invention further provide a high-transmittance, crosstalk-proof and electromagnetic pulse-resistant optical fiber panel, which includes an output end, an input end, and an optical fiber portion arranged between the output end and the input end; the optical fiber portion includes a plurality of copper-silver alloy-plated optical fibers, and the copper-silver alloy-plated optical fibers are, from the inside to the outside, an optical fiber core layer 10, an optical fiber sheath 11, and a copper-silver alloy coating 8. Light-absorbing filaments 9 and interstitial filaments 7 are inserted between different copper-silver alloy-plated optical fibers. The light-absorbing filaments 9 can absorb stray light, and the interstitial filaments 7 can reduce the porosity ratio. Figure 2 shown.

[0065] The optical properties of the obtained optical fiber panel, such as transmittance and electromagnetic pulse resistance, were tested.

[0066] In the above technical solution, the present invention utilizes copper-silver alloy-plated optical fibers to prepare optical fiber panels by directly plating the optical fiber filaments with a copper-silver alloy coating, arranging the single filaments, inserting light-absorbing filaments and white gap filaments for drawing, melting, pressing, and processing to produce the optical fiber panel; the phenomenon that its constituent unit - the optical fiber single filament is interfered with by other optical fiber filaments during the image transmission process will be significantly improved.

[0067] Some embodiments of the present invention further provide an image-intensified CCD camera, which includes the above-mentioned high-transmittance, crosstalk-proof, and electromagnetic pulse-resistant optical fiber panel.

[0068] Some embodiments of the present invention further provide an image-intensified CMOS camera, which includes the above-mentioned high-transmittance, crosstalk-proof, and electromagnetic pulse-resistant optical fiber panel.

[0069] The present invention will be further described below with reference to specific embodiments, but this should not be construed as limiting the scope of protection of the present invention. Non-essential improvements and adjustments made to the present invention by those skilled in the art based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0070] Example 1

[0071] This embodiment provides a copper-silver alloy. In the copper-silver alloy, the silver content is 92 wt%, the sum of the copper and silver contents is 99.995 wt%, the oxygen content is 4.8 ppm, the sum of the iron, nickel, sulfur and phosphorus contents is 8 ppm, and the sum of the other impurities is 6 ppm.

[0072] Among them, the melting point of the above-mentioned copper-silver alloy coating is 780°C, the softening temperature is about 500°C, the conductivity is 98.4% IACS, the coating elongation is 30%, the refractive index at a wavelength of 532nm is 1.28, the reflectivity at a wavelength of 532nm is about 87%, and the transmittance at a wavelength of 532nm is 72.65%.

[0073] The preparation method of the copper-silver alloy comprises the following steps:

[0074] 101. Determine the alloy composition and the corresponding proportion according to the above alloy ratio range; select the corresponding elemental metal material as the raw material, and accurately weigh the selected elemental metal to ensure that the proportion of each metal is accurate.

[0075] 102. The metal raw materials are subjected to necessary pretreatment to prevent excessive particle size and to remove oil, impurities, and moisture. The pretreatment includes degreasing (ultrasonic cleaning with 75% (v / v) alcohol for 20 minutes), drying (60°C, 30 minutes), and cutting (conventional). The degreasing, drying, and cutting steps are all based on existing techniques, and the specific steps are not repeated here.

[0076] 103. Place the pretreated metal raw materials into the heating furnace, turn on the smelting equipment, and heat the metal to 790°C until it is completely melted. During the heating process, stir the molten metal to ensure uniform mixing until the metal is completely dissolved and evenly distributed.

[0077] The steps of preparing the optical fiber panel using the copper-silver alloy specifically include:

[0078] 201. A skin glass tube with a refractive index of 1.50, an outer diameter of 31.17 mm, and an inner diameter of 28 mm is selected; a core glass rod with a refractive index of 1.80 and an outer diameter of 27.8 mm is selected, and the primary glass tube is sheathed on the primary glass rod to form an optical fiber preform rod. The optical fiber preform rod is melted into an optical fiber monofilament, and metal coating is performed. A metal coating is plated on the outer surface to produce a metal-coated optical fiber monofilament.

[0079] 202. Draw the optical fiber preform rod into optical fiber bare wire.

[0080] The optical fiber preform is heated to 820°C in a graphite furnace to fully soften it. Once the preform in the graphite furnace reaches a softened state, it is drawn into an optical fiber monofilament with a diameter of 3.2mm and a length of 1000mm. The drawing speed is controlled at approximately 12m / min.

[0081] 203. Then, a copper-silver alloy is coated on the surface of the bare optical fiber to form an optical fiber monofilament with a copper-silver alloy coating, and the coated optical fiber monofilament is collected by a fiber collecting device to obtain the copper-silver alloy-coated optical fiber; the copper-silver alloy-coated optical fiber comprises, from the inside to the outside, an optical fiber core layer, an optical fiber sheath and a copper-silver alloy coating.

[0082] Among them, Figure 1 The copper-silver alloy particles in the metal coating device are heated to a melting point of 790°C. The prepared bare optical fiber is then introduced into the metal coating device for coating. The coating temperature is 790°C, and the copper-silver alloy coating thickness is 18μm. The coated optical fiber filaments are collected by a fiber collection device to obtain copper-silver alloy-coated optical fiber monofilaments. The copper-silver alloy layer on the outer surface of the optical fiber monofilament has a refractive index of 1.28 at a wavelength of 532nm, a reflectivity of approximately 87% at 532nm, a transmittance of 72.65% at 532nm, and a coating elongation of 30%. Under test conditions with an electromagnetic wave radiation intensity of 10V / m and a radiation frequency fluctuation range of 80MHz to 1GHz, the shielding effectiveness can reach 84.37dB.

[0083] 204. The black absorption rod is drawn into a light-absorbing monofilament with a wire diameter of 0.3 mm under heating conditions of 820° C. The copper-plated silver alloy optical fiber monofilaments are arranged in a hexagonal close-packed manner, and the light-absorbing wire is uniformly filled in the gaps of the copper-plated silver alloy optical fiber monofilaments to obtain a primary composite rod, which is then drawn into a primary fiber filament (hereinafter referred to as a primary filament).

[0084] The primary composite rod in this step includes metal-plated fiber monofilaments and light-absorbing fibers. The black absorption rod is made of N3 light-absorbing glass with good light absorption performance, and its absorption coefficient in the 500-600nm band reaches above 0.95.

[0085] 205. Arrange multiple primary filaments in a hexagonal close-packed manner, and insert light-absorbing filaments into the gaps formed by the multiple hexagonal close-packed primary filaments according to a certain pattern, that is, every two fiber cores share one light-absorbing filament, thereby obtaining a primary composite rod with an opposite side size of 30 mm; draw the primary composite rod at 760°C to form a primary multifilament with an opposite side size of 1.50 mm and a length of 1000 mm; then, regularly cut the primary multifilament, arrange it in a hexagonal close-packed manner, and bundle it to obtain a secondary composite rod with an opposite side size of 30 mm; draw the secondary composite rod at 785°C to form a secondary multifilament with an opposite side size of 1.50 mm and a length of 1000 mm.

[0086] The primary composite rod and the secondary composite rod both have a regular hexagonal structure. In the steps of arranging multiple monofilaments in a hexagonal closest arrangement and then bundling them to obtain the primary composite rod, and in the steps of arranging multiple primary composite filaments in a hexagonal closest arrangement and then bundling them to obtain the secondary composite rod, multiple monofilaments or primary filaments are regularly cut and then arranged in a regular hexagonal mold. After the arrangement is completed, the filaments are bundled to obtain the primary composite rod or the secondary composite rod.

[0087] 206. After the secondary multifilament is arranged, it is placed in a high-precision fiber forming machine and pressed at 658°C to obtain a molten fiber bundle. The blank is rolled into a Φ60mm cylinder and then cut into a thin sheet blank with a thickness of 3mm.

[0088] 207. Use a precision engraving machine to perform optical finishing on the shape of the embryonic plate. After determining the central optical axis of the embryonic plate, process the input and output end faces of the embryonic plate.

[0089] Among them, the input and output end faces are optically polished by using a machining center to obtain the optical fiber panel, which includes an output end, an input end and an optical fiber part arranged between the output end and the input end; the optical fiber part includes a plurality of copper-silver alloy-plated optical fibers, and the copper-silver alloy-plated optical fibers are, from the inside to the outside, an optical fiber core layer 10, an optical fiber sheath 11 and a copper-silver alloy coating 8, and light absorbing wires 9 and filling wires 7 are inserted between different copper-silver alloy-plated optical fibers.

[0090] The optical fiber panel of this embodiment can be used in the preparation of an image-intensified CCD camera.

[0091] Example 2

[0092] This example provides a method for drawing an optical fiber using a copper-silver alloy coating obtained by melting the alloy material ratios shown in Example 2 in Table 2, and the corresponding core glass rod and sheath glass tube. The optical fiber monofilaments were coated, and the material properties were tested. Specific test results are shown in Table 2. The composition and ratio of the light-absorbing glass were the same as in Example 1. An optical fiber faceplate was also prepared using the methods and parameters of Example 1. The relevant parameters are detailed in Table 2.

[0093] The optical fiber panel of this embodiment can be used in the preparation of an image-intensified CCD camera.

[0094] Example 3

[0095] This example provides a method for producing a copper-silver alloy coating by melting the alloy material ratios shown in Example 3 in Table 2, and drawing an optical fiber using a corresponding core glass rod and sheath glass tube. The optical fiber monofilaments were coated, and the material properties were tested. Specific test results are shown in Table 2. The composition and ratio of the light-absorbing glass were the same as in Example 1. An optical fiber faceplate was also produced using the methods and parameters of Example 1. The relevant parameters are detailed in Table 2.

[0096] The optical fiber panel of this embodiment can be used in the preparation of an image-intensified CCD camera.

[0097] Example 4

[0098] This example provides a method for producing a copper-silver alloy coating by melting the alloy material ratios shown in Example 4 in Table 2, and drawing an optical fiber using a corresponding core glass rod and sheath glass tube. The optical fiber monofilaments were coated, and the material properties were tested. Specific test results are shown in Table 2. The composition and ratio of the light-absorbing glass were the same as in Example 1. An optical fiber faceplate was also produced using the methods and parameters of Example 1. The relevant parameters are detailed in Table 2.

[0099] The optical fiber panel of this embodiment can be used in the preparation of an image-intensified CCD camera.

[0100] Example 5

[0101] This example provides a method for producing a copper-silver alloy coating by melting the alloy material ratios shown in Example 5 in Table 2, and drawing an optical fiber using a corresponding core glass rod and sheath glass tube. The optical fiber monofilaments were coated, and the material properties were tested. Specific test results are shown in Table 2. The composition and ratio of the light-absorbing glass were the same as in Example 1. An optical fiber faceplate was also produced using the methods and parameters of Example 1. The relevant parameters are detailed in Table 2.

[0102] The optical fiber panel of this embodiment can be used in the preparation of an image-intensified CCD camera.

[0103] Example 6

[0104] This example provides a method for producing a copper-silver alloy coating by melting the alloy material ratios shown in Example 6 in Table 2, and drawing an optical fiber using a corresponding core glass rod and sheath glass tube. The optical fiber monofilaments were coated, and the material properties were tested. Specific test results are shown in Table 2. The composition and ratio of the light-absorbing glass were the same as in Example 1. An optical fiber faceplate was also produced using the methods and parameters of Example 1. The relevant parameters are detailed in Table 2.

[0105] The optical fiber panel of this embodiment can be used in the preparation of an image-intensified CCD camera.

[0106] Example 7

[0107] This example provides a method for producing a copper-silver alloy coating by melting the alloy material ratios shown in Example 7 in Table 2, and drawing an optical fiber using a corresponding core glass rod and sheath glass tube. The optical fiber monofilaments were coated, and the material properties were tested. Specific test results are shown in Table 2. The composition and ratio of the light-absorbing glass were the same as in Example 1. An optical fiber faceplate was also produced using the methods and parameters of Example 1. The relevant parameters are detailed in Table 2.

[0108] The optical fiber panel of this embodiment can be used in the preparation of an image-intensified CCD camera.

[0109] Example 8

[0110] This example provides a method for producing a copper-silver alloy coating by melting the alloy material ratios shown in Example 8 in Table 2, and drawing an optical fiber using a corresponding core glass rod and sheath glass tube. The optical fiber monofilaments were coated, and the material properties were tested. Specific test results are shown in Table 2. The composition and ratio of the light-absorbing glass were the same as in Example 1. An optical fiber faceplate was also produced using the methods and parameters of Example 1. The relevant parameters are detailed in Table 2.

[0111] The optical fiber panel of this embodiment can be used in the preparation of an image-intensified CCD camera.

[0112] The fiber optic panels obtained in Examples 1-8 were tested for transmittance and electromagnetic pulse resistance. The testing methods were: comparing the intensities of incident and outgoing light to calculate the transmittance of the fiber optic panel; measuring at multiple frequencies for a conventional fiber optic panel, recording the received value (PO) at each frequency; and measuring at multiple frequencies for an embodiment with a copper-silver alloy coating, recording the received value (PI) at each frequency to calculate the shielding effectiveness of the coated fiber optic panel; and measuring the coating elongation using an electronic universal testing machine.

[0113] Table 2 Alloy components of Examples 1-8 and performance test table of coated optical fiber panels

[0114]

[0115] From the data in Table 2, it can be seen that the refractive index of the copper-silver alloy coating of Examples 1-8 of the present invention at a wavelength of 532nm is 1.28-1.31, the reflectivity at a wavelength of 532nm is 87%-89%, the conductivity is 98.4-99.0% IACS, and the coating elongation is 30%-31%; the transmittance of the panel at a wavelength of 532nm is 72.48%-72.67%; the shielding effectiveness can reach 84.37dB-85.61dB under the test environment where the radiation intensity of the electromagnetic wave is 10V / m and the radiation frequency test fluctuation range is 80MHz-1GHz; the texture of Ag is softer , has better conductivity than Cu. When electromagnetic pulse interference occurs, the external copper-silver alloy coating can effectively reflect the pulse signal. Part of the pulse signal transmitted into the copper-silver alloy coating is guided along the copper-silver alloy coating, thereby reducing interference with the signal transmitted by the optical fiber panel. Therefore, as the Ag content increases, the optical fiber panel's ability to resist electromagnetic pulses increases, and the conductivity and elongation of the copper-silver alloy coating increase. The increase in the reflectivity of the copper-silver alloy coating effectively reduces the optical crosstalk between optical fibers, improves the resolution of the optical fiber panel, and correspondingly improves the imaging quality. At the same time, it reduces the overflow of the optical signal, and the transmittance of the optical fiber panel also increases. The performance of the above optical fiber panel meets the requirements of steps 101-103 and steps 201-208. The thickness of the copper-silver alloy coating is 18μm. This ensures that the optical fiber panel has high anti-interference performance and can effectively control the production cost of the optical fiber panel.

[0116] Comparative Example 1:

[0117] A core and sheath glass rod tube was prepared according to the core and sheath glass component ratios shown in Example 1. The metal ratio was adjusted, and the coating metal used had a silver content of 99.995wt%, an oxygen content of 4.8ppm, a sum of the iron, nickel, sulfur and phosphorus contents of 8ppm, and a sum of the remaining impurities of 6ppm. Then, a fiber optic panel preparation method was used in which light absorbing filaments, structural filaments, etc. were inserted to prepare a fiber optic panel. Since the coating metal is almost pure silver, the melting point of the metal is significantly increased, exceeding 900°C, and the coating temperature needs to be increased to completely melt the coating metal. Since the coating temperature is too high, the optical fiber filaments are deformed, and the complete single-filament coating process cannot be carried out, and the fiber optic panel cannot be produced.

[0118] Comparative Example 2:

[0119] A core and sheath glass rod tube was prepared according to the core and sheath glass component ratios shown in Example 1. The thickness of the metal coating was then reduced, and a fiber optic panel was prepared by inserting light-absorbing filaments, structural filaments, and other components using optical fiber monofilaments with a 15 μm metal coating. All other aspects remained the same as in Example 1, resulting in an anti-interference fiber optic panel. The shielding capability of the fiber optic panel in Comparative Example 2 was significantly reduced, with a shielding effectiveness of approximately 70 dB.

[0120] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some embodiments, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0121] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0122] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

[0123] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiment based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a high-transmittance, crosstalk-proof and electromagnetic pulse-resistant optical fiber panel, characterized in that: The following steps are involved: a. Put the leather tube on the core rod to make an optical fiber preform; b. Melting the optical fiber preform obtained in step a into an optical fiber monofilament, and performing a metal coating process to plate a metal coating on the outer surface of the optical fiber monofilament to produce a metal-coated optical fiber monofilament; the metal coating is composed of a copper-silver alloy; in terms of weight percentage, the sum of the copper and silver contents of the copper-silver alloy is ≥ 99.995 wt %, and the silver content is 92 wt % to 95 wt %; the thickness of the metal coating is ≥ 18 μm; c. Drawing the black absorption rod into a light-absorbing monofilament, and arranging the metal-coated optical fiber monofilaments obtained in step b in a hexagonal close-packed manner, and uniformly filling the light-absorbing filaments in the gaps of the metal-coated optical fiber monofilaments to obtain a primary composite rod, and drawing the primary composite rod into a primary fiber filament; d. Arranging a plurality of primary fiber filaments in a hexagonal close-packed arrangement, and inserting light-absorbing filaments in a certain pattern into the gaps formed by the hexagonal close-packed arrangement of the plurality of primary fiber filaments to obtain a primary composite rod; drawing the primary composite rod into a primary multifilament; regularly cutting the primary multifilament, arranging the hexagonal close-packed arrangement, and bundling to obtain a secondary composite rod; drawing the secondary composite rod into a secondary multifilament; regularly cutting the secondary multifilament, arranging the hexagonal close-packed arrangement, and bundling to obtain a secondary multifilament rod; e. Drawing the secondary multifilament rod obtained in step d at 658-668° C. to obtain a molten fiber bundle; After being cut to a fixed length and then mechanically cold-processed, a cylindrical blank is obtained; the blank is optically fine-processed and optically polished to obtain the optical fiber panel with high transmittance, anti-crosstalk and anti-electromagnetic pulse.

2. The method for preparing a high-transmittance, crosstalk-proof and electromagnetic pulse-resistant optical fiber panel according to claim 1, wherein: In step a, the refractive index of the leather tube at a wavelength of 532 nm is 1.50-1.51, and the refractive index of the core rod at a wavelength of 532 nm is 1.80-1.81; in step c, the primary composite rod includes a metal-plated fiber monofilament and a light-absorbing filament; and the black absorption rod is made of glass with an absorption coefficient of greater than 0.95 in the 500-600 nm band.

3. The method for preparing a high-transmittance, crosstalk-proof and electromagnetic pulse-resistant optical fiber panel according to claim 1, wherein: In step b, the oxygen content in the copper-silver alloy is less than 5 ppm, the sum of the contents of iron, nickel, sulfur and phosphorus is less than 8 ppm, and the sum of the contents of other impurities is less than 6 ppm.

4. The method for preparing a high-transmittance, crosstalk-proof and electromagnetic pulse-resistant optical fiber panel according to claim 1, wherein: In step b, the method for preparing the copper-silver alloy comprises the following steps: The alloy composition and corresponding proportions are determined according to the sum of the copper and silver contents in the copper-silver alloy being ≥99.995wt% and the silver content being 92wt%-95wt%; corresponding elemental metal materials are selected as raw materials and the metal raw materials are pretreated; the pretreated metal raw materials are heated to 780-800°C while stirring until the metals are completely melted and evenly mixed, thereby obtaining the copper-silver alloy.

5. A high-transmittance, crosstalk-proof and electromagnetic pulse-resistant optical fiber panel according to any one of claims 1 to 4, characterized in that: The optical fiber portion includes a plurality of copper-silver alloy-plated optical fibers, which are composed of an optical fiber core layer, an optical fiber sheath, and a copper-silver alloy coating from the inside out, with light-absorbing filaments and interstitial filaments inserted between different copper-silver alloy-plated optical fibers. In terms of weight percentage, the oxygen content in the copper-silver alloy coating is less than 5ppm, the sum of the contents of iron, nickel, sulfur, and phosphorus is ≤8ppm, and the sum of the contents of other impurities is ≤6ppm.

6. An image-intensified CCD camera, characterized in that: The image-intensified CCD camera includes the high-transmittance, crosstalk-proof and electromagnetic pulse-resistant optical fiber panel according to claim 5 .

7. An image-intensified CMOS camera, characterized in that: The image-intensified CMOS camera includes the optical fiber panel with high transmittance, crosstalk resistance and electromagnetic pulse resistance as claimed in claim 5 .

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