CN115353287B - A Φ40mm large-size fiber optic image inverter and its surface processing method and application - Google Patents

Abstract

The invention discloses a phi 40mm large-size optical fiber image inverter and a surface processing method and application thereof, wherein the surface processing method comprises the following steps: grinding the phi 40mm large-size optical fiber image inverter by using 7-10 micrometer silicon carbide, and performing ultrasonic purification treatment on the ground phi 40mm large-size optical fiber image inverter by using purified water; and (3) carrying out surface polishing treatment on the large-size optical fiber image inverter with the diameter of 40mm after the purification treatment by using a polishing medium. The surface processing method of the phi 40mm large-size optical fiber image inverter can effectively improve the surface optical uniformity of the phi 40mm large-size optical fiber image inverter, and the polished phi 40mm large-size optical fiber image inverter has the advantages of flat and smooth surface, no pit defect, low scratch rate, excellent polishing effect, smooth surface, easy cleaning, contribution to improving the surface quality, capability of furthest reducing the use of auxiliary materials in various polishing processes, high polishing quality, low production cost and few surface defects.

Description

A φ40mm large-size fiber optic image inverter and its surface processing method and application

technical field

The invention relates to the fields of surface processing of glass rods and manufacturing of optical fiber image transmission components, in particular to a φ40mm large-size optical fiber image inverter and its surface processing method and application.

Background technique

Optical fiber imaging components include fiber optic panels, fiber optic inverters, fiber optic cones, fiber optic image transmission bundles, etc., which are photoelectric imaging components with excellent performance. , small inter-stage coupling loss, clear and true image transmission, high light transmission efficiency, optical zero thickness in image transmission, and improved edge image quality. Optical fiber image transmission components are widely used in various cathode ray tubes, camera tubes, charge-coupled device (CCD, Charge-coupled Device) couplings, medical device display screens and high-speed High-definition TV imaging and other instruments and equipment that need to transmit images are high-tech cutting-edge products in the optoelectronics industry in this century. With the development of information technology, fiber optic inverters play an increasingly important role in the field of low-light night vision. effect.

Among them, the fiber optic inverter whose effective area size is larger than Φ40mm is called a large-size fiber optic inverter. The large-size fiber optic image inverter has the characteristics of large size, high resolution, large field of view, etc., and stable image transmission. It is widely used in machine vision, flight simulators, etc., and can be used for gun aiming of main battle tanks and periscope reconnaissance and surveillance. , Timely collection of nuclear experiment images, low-light night vision systems for large armored vehicles, tanks, and large ships. The large-size fiber optic inverter is a hard fiber optic image transmission component that can transfer images and is prepared by tens of thousands of optical fibers with a unit fiber diameter less than 6 μm, which are closely packed, hot-melted and pressed, and twisted. . Each optical fiber in the fiber optic image inverter has good optical insulation, so each optical fiber can transmit light and image independently without being affected by other adjacent optical fibers. As an optical coupling image transmission device, it has high It has the characteristics of resolution, zero distortion, and high light transmission efficiency. It also has the function of image inversion, which can obtain large-scale, large-field, and long-distance observation.

Since the large-size fiber optic inverter is a key device used to make a large field of view low-light imager, it is mainly used in cathode ray tubes, camera tubes, image intensifiers and other instruments and equipment that need to transmit images, and the imaging field of view requires a large , so that large-size fiber optic inverters can be reused in detection instruments and medical equipment. Compared with small-size fiber optic inverters, the production of large-size fiber optic Make corresponding improvements or redesign to make large-size fiber optic inverters. The key to making large-scale fiber optic inverters is the processes of melting and pressing, torsion forming, and cold processing of the blank. Among them, cold processing is the last process in the production of large-scale optical fiber inverters, which directly affects the quality of finished products of optical fiber devices, so the requirements for product manufacturing processes are extremely high. Due to the large diameter, large surface area, and large volume of large-size fiber optic inverters, the larger the size of the fiber optic inverter during cold processing, the more difficult the surface processing process, the higher the degree of fineness of operation, and the more difficult the cold processing process. Difficult, the greater the probability of the surface of the large-scale fiber optic inverter being corroded and scratched during the surface processing, it will cause pits, bumps and other defects on the surface of the large-size fiber optic Problems such as uneven corrosion resistance of materials lead to more defects such as pits and holes, making manufacturing difficult. In order to improve the surface finish and light transmittance of the φ40mm large-size fiber optic inverter, the surface of the φ40mm large-size fiber optic inverter is usually polished. The commonly used polishing methods include chemical polishing and mechanical polishing. Chemical polishing It uses acid solution or alkali solution to chemically corrode the surface of the glass rod. The disadvantage is that it will corrode some effective chemical components on the surface of the glass rod or cause ion diffusion at the core-skin interface, and the chemical solution has strong corrosion ability and is harmful to the human body and the environment. It is harmful, and the waste liquid cannot be recycled and the waste liquid is difficult to deal with. The mechanical polishing method is a method of surface polishing treatment using polishing powder. The disadvantages are long processing cycle, low efficiency, need to use a large number of auxiliary materials, high production cost and existence Uneven polishing and other problems, and during the polishing process, polishing media such as polishing powder will remain on the surface of the glass rod. Due to the small size of the polishing media, it is easy to adhere to the surface of the glass rod and cannot be removed. These impurity particles and debris enter the surface It will affect the light transmission quality of the large-size fiber optic image inverter, and then affect the internal image transmission quality.

Contents of the invention

In order to solve the surface polishing problem in the prior art for preparing large-size fiber optic inverters of φ40mm and improve the surface quality of large-size fiber optic inverters, the present invention provides a surface processing method for large-size fiber optic inverters of φ40mm , aims to solve the problems of low polishing efficiency, poor polishing effect, and pits on the surface in the traditional polishing method of φ40mm large-size fiber optic inverter.

In order to achieve the above object, the technical scheme that the present invention takes is:

A method for processing the surface of a φ40mm large-scale optical fiber inverter, comprising the following steps:

(1) Grind the φ40mm large-size fiber optic inverter with 7-10 micron corundum, and then ultrasonically purify the φ40mm large-size fiber optic inverter with pure water;

(2) After the purification treatment, the φ40mm large-size fiber optic inverter is then polished with a polishing medium.

The polishing medium includes the following substances in mass percentage:

Rare earth oxide content is 61-70%;

The lubricant content is 5-10%;

The content of water is 20-25%;

1-5% for other substances;

The other substances are selected from at least one of zinc nitrate, sodium carbonate and potassium carbonate.

The rare earth oxide is cerium oxide and lanthanum oxide, the mass ratio of cerium oxide to lanthanum oxide is (12-16):1, and the particle size of the rare earth oxide is 0.5 μm˜3 μm.

The lubricant is at least one of ethylene glycol and sodium dodecylsulfonate, which plays the role of suspending and dispersing the polishing medium, making it difficult to precipitate and stabilize; and/or the water is tap water or deionized water , preferably deionized water.

The particle size of the rare earth oxide is 1.0-2.0 μm.

The time of the ultrasonic cleaning treatment is 50-80 minutes; the time of the polishing treatment is 0.5-2.0 hours; the polishing speed of the φ40mm large-size optical fiber inverter is 150-300rad/min; the cleaning of the polishing environment The precision is above 100,000 grades; the grinding amount of the upper and lower planes of the φ40mm large-size optical fiber inverter is both 0.04mm.

The present invention also provides a φ40mm large-size optical fiber inverter, which is obtained after being processed according to the above-mentioned surface processing method.

The φ40mm large-size fiber optic inverter includes core glass and skin glass:

The core glass has a refractive index of 1.79-1.82 and is composed of the following components in molar percentages: SiO ₂ 20-25%, B ₂ O ₃ 19-27%, CaO 0.5-5%, SrO 1-5 %, BaO 15-25%, TiO ₂ 10-15%, La ₂ O ₃ 5-15%, Gd ₂ O ₃ 7.1-10%, Nb ₂ O ₅ 1-5%;

The cladding glass has a refractive index of 1.48-1.51 and is composed of the following components in molar percentage: SiO ₂ 73.0-78.0%, Al ₂ O ₃ 1.0-5.0%, B ₂ O ₃ 1.0-5.0%, Na ₂ O 0.1-2.9%, K ₂ O 7.1-12.0%, MgO 5.1-10.0%, SrO 0.1-5.0%, ZnO 0.1-1.0%, F ₂ 1.1-2.5%.

The present invention further provides an optical fiber image transmission component, including the above-mentioned φ40mm large-size optical fiber image inverter.

The present invention further provides an application of a φ40mm large-size optical fiber image intensifier in low-light image intensifiers.

Compared with the prior art, the surface processing method of a kind of φ40mm large-scale optical fiber inverter of the present invention has the following characteristics:

(1) It can effectively improve the optical uniformity of the surface of the φ40mm large-size fiber optic inverter, which is beneficial to the improvement of the surface quality and has less surface defects. After polishing, the surface of the φ40mm large-size fiber optic inverter is smooth and flat, with low roughness and no concave Pit defects, low scratch rate, and can take into account the corrosion resistance of the core-skin glass material and the surface roughness and scratch performance indicators of the φ40mm large-scale optical fiber inverter. The present invention is the best process method for obtaining a non-damaged surface;

(2) The present invention obtains the processing process of the smooth surface of the φ40mm large-size optical fiber inverter through chemical and mechanical force, and a series of chemical reactions occur on the surface of the φ40mm large-size optical fiber inverter through the slurry mixed with tiny particles and chemical solutions , to achieve the purpose of excellent polishing effect, high polishing efficiency and no impurities after polishing. The surface of the φ40mm large-size fiber optic inverter forms a transparent and smooth polished surface, which is smooth and easy to clean;

(3) The present invention can minimize the use of auxiliary materials in the polishing process of the φ40mm large-size optical fiber inverter, the rare earth oxide can effectively improve the polishing effect, the polishing effect is excellent, and the lubricant can prevent the polishing surface of the glass rod from being scratched, Reduce the scratch rate, and the addition of other substances is also conducive to the improvement of polishing quality and the reduction of production costs;

(4) The surface processing method of the present invention is low in production cost, low in energy consumption, non-toxic, environmentally friendly, and can well meet the needs of industrial production.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the schematic diagram of the internal structure of the optical fiber forming the φ40mm large-size optical fiber inverter provided by the embodiment of the present invention;

Fig. 2 is a schematic diagram of the total reflection of the optical fiber of the φ40mm large-size fiber optic inverter provided by the embodiment of the present invention.

Among them, 1 is light absorbing material glass, 2 is core glass, and 3 is skin glass.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below. The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but it is not intended to limit the present invention.

Referring to Fig. 1 and Fig. 2, the skin glass tube and the core glass rod are matched and then drawn into monofilaments, the monofilaments include the outer skin glass 3 and the inner core glass 2, and the multiple monofilaments are closely arranged into a cross-section of A regular hexagonal hexagon, with a light-absorbing filament drawn from light-absorbing material glass 1 between adjacent monofilaments, a composite rod is formed after the light-absorbing filament is inserted into the hexagon, and a composite rod is drawn into a A multifilament as shown in Figure 1.

In the present invention, the term "granularity" refers to the size of the particle. When the particle is a sphere, the granularity is represented by the diameter of the sphere. When the particle is a cube, the granularity is represented by the side length of the cube. When the particle is In the case of irregular shapes, the particle size is expressed by the mesh size of the sieve that can just screen out the particles.

The polishing medium of the present invention comprises the following mass percentages:

Rare earth oxide content is 61-70%;

The lubricant content is 5-10%;

The content of water is 20-25%;

1-5% for other substances;

Among them, other substances include at least one of zinc nitrate, sodium carbonate and potassium carbonate, and these substances can form a film layer with weak binding force on the surface of the glass rod in a short time. In this case, the uniformity of chemical action Good, the uniformity and consistency of the polishing treatment are good, which is conducive to improving the polishing effect and saving polishing time. When the composition of the polishing medium is within the above range, during the polishing process, the mechanical action and the chemical action reach an equal state. In this case, the uniformity of the chemical action is good, so that the surface tension is small and the treatment consistency is good. , can get a good glass rod surface polishing effect. The polishing speed of the φ40mm large-size fiber optic inverter of the present invention is set according to the polishing time, preferably the polishing speed of the φ40mm large-size fiber optic inverter is 150-300rad/min.

Since the depth of pits existing on the surface of φ40mm large-size fiber optic inverter is generally a few microns, it takes 2-5 times of polishing to completely remove it. You can measure the overall height of the fiber optic inverter before grinding, and then adjust it after grinding. The overall height is measured, and when the grinding amount of the upper and lower plane grinding reaches 0.04mm, the grinding is completed. In order to prevent the φ40mm large-size fiber optic inverter from being polluted during the polishing process, a clean room is selected for the polishing environment, and the cleanliness of the polishing environment is above 100,000 grades.

The high refractive index fiber core glass material of the present invention has a suitable thermal expansion coefficient, and the average linear thermal expansion coefficient in the range of 30 to 300 ° C is (89±4)×10 ^-7 / ° C; it has a high refractive index, and the refractive index n _D is 1.79-1.82; it has good anti-crystallization performance, and the crystallization temperature is greater than 850 °C; the water resistance and acid resistance are better than class II, and it has good transparency to visible light radiation and good chemical stability.

The skin glass described in the present invention is a low refractive index glass, which is composed of SiO ₂ -Al ₂ O ₃ -B ₂ O ₃ -RO-R ₂ O glass system, and F ₂ is introduced as a glass clarifying agent to eliminate air bubbles And reduce the refractive index of the glass, introduce alkali metal oxide RO and alkaline earth metal oxide R ₂ O to improve the anti-devitrification performance and high temperature viscosity characteristics of the glass, increase the lower limit of the crystallization temperature of the glass, and introduce a certain amount of ZnO to adjust The viscosity of the glass can effectively improve the crystallization performance, and can obtain a skin glass formula and a manufacturing process that meet the requirements of the field of optical fiber image transmission components.

Parameters measured by the core-skin glass used for the optical fiber image transmission element of the present invention and measurement methods and instruments are as follows:

(1) Refractive index n _D [refractive index of glass at λ=589.3nm];

(2) Average thermal expansion coefficient α _30/300 [10 ^-7 /°C] at 30-300°C;

(3) The crystallization temperature _Tc (°C) of the glass.

Among them, the refractive index n _D of glass is measured by a refractometer; the linear expansion coefficient of 30-300 °C is measured by a horizontal dilatometer, expressed as an average linear expansion coefficient, and measured by the method specified in ISO 7991. The crystallization temperature is measured by the method specified in ASTM C829-1981 for measuring the liquefaction temperature of glass by gradient furnace method.

In this paper, all "mole percentages mol.%" are based on the total molar weight of the final glass composition, and the chemical composition (mol .%).

Chemical composition (mol.%) and glass properties of the fiber core glass embodiment of table 1

Chemical composition (mol.%) and glass performance of table 2 skin glass embodiment

In the following examples, the raw materials and raw material requirements of the used core-skin glass material for preparing φ 40mm large-scale fiber optic inverters are as follows:

The raw materials and raw material requirements for core glass are as follows:

Quartz sand (high purity, 150 μm sieve content is less than 1%, 45 μm sieve content is less than 30%, Fe ₂ O ₃ content is less than 0.01wt.%), boric acid or boric anhydride (400 μm sieve content is less than 10%, 63μm undersize is 10% or less), calcium carbonate (analytical pure, average particle size 250μm), strontium carbonate (analytical pure, purity ≥99.0%), barium nitrate (analytical pure, purity ≥99.0%), titanium dioxide (chemically pure ), lanthanum trioxide (5N), gadolinium trioxide (5N), niobium pentoxide (5N).

The raw materials and raw material requirements for skin glass are as follows:

Quartz sand (high purity, 150μm sieve 1% or less, 45μm sieve 30% or less, Fe ₂ O ₃ content less than 1PPm), aluminum hydroxide or alumina (analytical pure, average particle size 50μm), boric acid Or boric anhydride (400μm sieve is less than 10%, 63μm sieve is less than 10%), sodium carbonate (industrial soda ash), potassium carbonate or potassium nitrate (analytical pure, purity ≥ 99.0%), basic magnesium carbonate ( Chemically pure, with an average particle size of 50 μm), magnesium fluoride (analytically pure, with an average particle size of 45 μm, the sieve content is less than 1%), strontium carbonate (analytical pure, purity ≥ 99.0%), zinc oxide (analytical pure).

The core-skin glass used in the φ40mm large-scale fiber optic inverter of the present invention has the following properties:

(1) It has good thermal performance matching, and the thermal expansion coefficient is similar; the thermal expansion coefficient of the core glass is (3-10)×10 ^-7 /°C higher than that of the skin glass, and this thermal performance matching can greatly improve the optical fiber. Bending, tensile, torsional strength.

(2) It has good compatibility matching of chemical properties, no harmful ion diffusion or chemical reaction will occur at the core and skin interface of the drawn optical fiber, and the number of internal spot defects of the prepared optical fiber image transmission element is small and the size is small. Less than 50μm;

(3) It has good compatibility matching of optical properties, and the prepared optical fiber image transmission element has excellent fixed pattern noise performance, and the transmittance is > 65% in the wavelength range of 500-600nm, and it is observed under a 10 times microscope without any Clear multifilament borders.

(4) The softening point temperature of the core glass of the present invention is 30-100°C higher than that of the skin glass, and when the fiber is drawn, the skin glass frit can be close to the core glass frit; the viscosity of the core glass and the skin glass at the drawing temperature Roughly close to each other, it is beneficial to the stability of the fiber diameter. The two glasses are matched to draw optical fiber filaments, and no neutralization reaction and harmful ion diffusion will occur at the core-skin interface.

The core material glass rod used in the φ40mm large-scale optical fiber inverter of the present invention uses rare earth oxides to increase the refractive index of the glass. After improving the refractive index of the core material glass of the optical fiber image transmission element, not only the effective numerical aperture of the glass can be improved, Moreover, it can improve the performance of fiber optic panels, fiber optic inverters, and fiber optic cones.

The present invention will be further described below through specific examples.

Example 1

Prepare the polishing medium according to the following substances in mass percentage:

The content of cerium oxide is 60%; the content of lanthanum oxide is 5%; the content of ethylene glycol is 10%; the content of deionized water is 20%; . A polishing medium is obtained by uniformly mixing the above substances.

The lubricant of the present invention has the effect of suspending and dispersing the polishing medium, preventing precipitation and stabilizing;

A method for processing the surface of a φ40mm large-scale optical fiber inverter, comprising the following steps:

(1) Choose a room with a cleanliness of more than 100,000 to grind with 10 micron corundum. The grinding amount of the upper and lower planes of the φ40mm large-scale fiber optic inverter is both 0.04mm. Ultrasonic purification of water for 1 hour;

(2) After the purification process, the φ40mm large-size fiber optic inverter is polished with polishing medium for 1 hour, and the rotating speed of the φ40mm large-size fiber optic inverter is 200rad/min, until the surface of the φ40mm large-size fiber optic inverter is observed with a 10 times microscope It is preferable that there is no pit defect.

The core-skin glass used in the used φ40mm large-scale fiber optic inverter is prepared according to the following method:

Preparation method of core glass:

First, select the raw materials according to the glass composition of Example 1 in Table 1, and strictly control the oxides of variable valence elements such as Fe ₂ O 3 in the glass raw materials, and the content of Fe ₂ O ₃ in the finished glass is less than 150PPm, and make _the ingredients meet The chemical composition of the glass in Table 1, and then use a platinum crucible to melt at 1550°C for 6 hours. During the glass melting process, stir the glass 2 to 3 times to make the glass melt evenly. After the glass is melted, cool down Clarify at 1420°C for 2 hours, then cast the molten glass into the specified test product requirements, and then anneal. The annealing process is 605°C for 2 hours, then cool down to 100°C for 24 hours, and then cool to room temperature with the furnace. Its test performance is shown in Table 1, (1) the refractive index is 1.81; (2) the average linear expansion coefficient at 30-300°C is 85×10 ^-7 /°C.

The preparation method of skin glass:

Select the raw materials according to the glass composition of Example 1 in Table 2, and require strict control of the oxides of variable valence elements in the glass raw materials such as _Fe2O3 , etc., the content of _Fe2O3 in the finished glass is less than 1PPm, and make _the ingredients meet _the requirements in Table 2 The chemical composition of the glass is then melted in a pure platinum crucible at 1550°C for 6 hours. During the glass melting process, the glass is stirred 2 to 3 times. After the glass is melted evenly, the molten glass is drawn into a glass tube. , and then annealed, the test properties are shown in Table 2, (1) the refractive index is 1.48; (2) the average coefficient of linear expansion at 30-300°C is 85×10 ^-7 /°C; (3) the crystallization of the glass The temperature was 910°C.

Example 2

Prepare the polishing medium according to the following substances in mass percentage:

The content of cerium oxide is 57%; the content of lanthanum oxide is 4%; the content of ethylene glycol is 4%; the content of sodium dodecylsulfonate is 5%; the content of deionized water is 25%; the content of zinc nitrate is 5%; The particle size of cerium oxide is 1 μm and that of lanthanum oxide is 2.0 μm. A polishing medium is obtained by uniformly mixing the above substances.

The lubricant of the present invention has the effect of suspending and dispersing the polishing medium, preventing precipitation and stabilizing;

A method for processing the surface of a φ40mm large-scale optical fiber inverter, comprising the following steps:

(1) Choose a room with a cleanliness of more than 100,000 to grind with 7 micron corundum. The grinding amount of the upper and lower planes of the φ40mm large-size fiber optic inverter is 0.04mm. Ultrasonic purification of water for 50 minutes;

(2) The φ40mm large-size fiber optic inverter after the purification process is polished with polishing medium for 0.5 hours, and the rotating speed of the φ40mm large-size fiber optic inverter is 300rad/min; until the surface of the φ40mm large-size fiber optic inverter is observed with a 10-fold microscope Pit defects are preferred.

The used φ40mm large-size fiber optic inverter core glass is prepared according to the following method:

Preparation method of core glass:

Refer to Example 2 in Table 1 for the actual composition of the glass, use the same raw materials and raw material requirements as in Example 1 in Table 1, and take melting at 1500 ° C for 8 hours. During the glass melting process, the glass is stirred twice to make The glass is melted evenly. After the glass is melted, it is cooled to 1400°C for 1.5 hours of clarification, and then the molten glass is cast into the specified test product requirements, and then annealed. The annealing process is 600°C for 1.5 hours and then 23 hours. Cool down to 100°C, then cool down to room temperature with the furnace.

Using the same test conditions as in Example 1, Table 1 shows the basic properties of the samples. (1) The refractive index is 1.81; the average coefficient of linear expansion at 30-300°C is 91×10-7/°C.

The preparation method of skin glass:

The actual composition of the glass refers to Example 2 in Table 2, uses the same raw materials and raw material requirements as in Example 1 in Table 2, and adopts a melting process system of melting at 1450 ° C for 10 hours and the same test conditions as in Example 1. 2 shows the basic properties of the samples. (1) The refractive index is 1.49; (2) The average linear expansion coefficient at 30-300°C is 82×10 ^-7 /°C; (3) The crystallization temperature of the glass is 915°C.

Example 3

Prepare the polishing medium according to the following substances in mass percentage:

The content of cerium oxide is 65%; the content of lanthanum oxide is 5%; the content of ethylene glycol is 5%; the content of tap water is 22%; zinc nitrate is 1%; sodium carbonate is 2%; The particle size of lanthanum oxide is 3.0 μm. A polishing medium is obtained by uniformly mixing the above substances.

The lubricant of the present invention has the effect of suspending and dispersing the polishing medium, preventing precipitation and stabilizing;

A method for processing the surface of a φ40mm large-scale optical fiber inverter, comprising the following steps:

(1) Choose a room with a cleanliness of more than 100,000 to grind with 8-micron corundum. The grinding amount of the upper and lower planes of the φ40mm large-scale fiber optic inverter is both 0.04mm. Water ultrasonic purification treatment for 80 minutes;

(2) After purification, the φ40mm large-size fiber optic inverter is polished with polishing felt and polishing medium for 2.0 hours, and the rotating speed of the φ40mm large-size fiber optic inverter is 150rad/min; until the surface of the φ40mm large-size fiber optic inverter is used 10 times Microscopic observation without pit defects is advisable.

The core-skin glass used in the used φ40mm large-scale fiber optic inverter is prepared according to the following method:

Preparation method of core glass:

The actual composition of the glass refers to Example 3 in Table 1, using the same raw materials and raw material requirements as in Example 1 in Table 1, and melting at 1480°C for 10 hours. During the glass melting process, the glass is stirred three times to make The glass is melted evenly. After the glass is melted, it is cooled to 1380°C for 2.5 hours of clarification, and then the molten glass is cast into the specified test product requirements, and then annealed. The annealing process is 20 hours after holding at 595°C for 2.5 hours. Cool down to 100°C, then cool down to room temperature with the furnace

Using the same test conditions as in Example 1, Table 1 shows the basic properties of the samples. (1) The refractive index is 1.80; the average coefficient of linear expansion at 30-300°C is 93×10 ^-7 /°C.

Preparation method of skin glass:

The actual composition of the glass refers to Example 3 in Table 2, uses the same raw materials and raw material requirements as in Example 1 in Table 2, and adopts a melting process system of melting at 1500 ° C for 8 hours and the same test conditions as in Example 1. 1 shows the basic properties of the samples. (1) The refractive index is 1.50; (2) The average linear expansion coefficient at 30-300°C is 86×10 ^-7 /°C; (3) The crystallization temperature of the glass is 910°C.

Example 4

Prepare the polishing medium according to the following substances in mass percentage:

The content of cerium oxide is 60%; the content of lanthanum oxide is 4%; the content of sodium dodecylsulfonate is 10%; the content of tap water is 25%; potassium carbonate is 1%; The particle size of lanthanum is 2.0 μm. A polishing medium is obtained by uniformly mixing the above substances.

The lubricant of the present invention has the effect of suspending and dispersing the polishing medium, preventing precipitation and stabilizing;

A method for processing the surface of a φ40mm large-scale optical fiber inverter, comprising the following steps:

(1) Choose a room with a cleanliness of more than 100,000 to grind with 9 micron corundum. The grinding amount of the upper and lower planes of the φ40mm large-size fiber optic inverter is both 0.04mm. Ultrasonic purification of water for 1 hour;

(2) The purified φ40mm large-size fiber optic inverter was polished with a polishing medium for 1.5 hours, and the rotating speed of the φ40mm large-size fiber optic inverter was 250 rad/min.

The core-skin glass used in the used φ40mm large-scale fiber optic inverter is prepared according to the following method:

Preparation method of core glass:

The actual composition of the glass refers to Example 4 in Table 1, using the same raw materials and raw material requirements as in Example 1 in Table 1, and melting at 1450°C for 5 hours, and stirring the glass 2-3 times during the glass melting process , so that the glass is melted evenly. After the glass is melted, it is cooled to 1390 ° C for 2 hours to clarify, and then the molten glass is cast into the specified test product requirements, and then annealed. Cool down to 100°C in 24 hours, then cool down to room temperature with the furnace,

Using the same test conditions as in Example 1, Table 1 shows the basic properties of the samples. (1) The refractive index is 1.82; the average coefficient of linear expansion at 30-300°C is 89×10 ^-7 /°C.

Preparation method of skin glass:

Refer to Example 4 in Table 2 for the actual composition of the glass, use the same raw materials and raw material requirements as in Example 1 in Table 2, and adopt the melting process system and test conditions of melting at 1480 ° C for 7 hours. Table 1 shows the samples. basic performance. (1) The refractive index is 1.51; (2) The average linear expansion coefficient at 30-300°C is 88×10 ^-7 /°C; (3) The crystallization temperature of the glass is 905°C.

Example 5

According to the preparation polishing medium of the substance mass percentage composition of embodiment 1;

A kind of surface processing method of φ 40mm large-scale optical fiber inverter is as embodiment 1;

The core-skin glass used in the used φ40mm large-scale fiber optic inverter is prepared according to the following method:

Preparation method of core glass:

Refer to Example 5 in Table 1 for the actual composition of the glass, use the same raw materials and raw material requirements as in Example 1 in Table 1, and adopt the same melting process system and test conditions. Table 1 shows the basic properties of the samples. (1) The refractive index is 1.79; the average coefficient of linear expansion at 30-300°C is 87×10 ^-7 /°C.

Preparation method of skin glass:

Refer to Example 5 in Table 2 for the actual composition of the glass, use the same raw materials and raw material requirements as in Example 1 in Table 2, and adopt the same melting process system and test conditions. Table 1 shows the basic properties of the samples. (1) The refractive index is 1.51; (2) The average linear expansion coefficient at 30-300°C is 84×10 ^-7 /°C; (3) The crystallization temperature of the glass is 905°C.

From the data obtained in the examples, it can be known that the φ40mm large-size optical fiber inverter of the present invention has the advantages of good surface processing quality, high surface polishing quality, low production cost, and few surface defects, and does not contain heavy metal oxidation that is seriously harmful to the environment. The advantages of objects can be applied in large-size low-light image intensifiers.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (8)

1. a surface processing method of a Φ40mm large-scale optical fiber inverter, is characterized in that, comprises the following steps: (1) Grind the Φ40mm large-size fiber optic inverter first with 7-10 micron corundum, and then ultrasonically purify the ground Φ40mm large-size fiber optic inverter with pure water; (2) After purification, the Φ40mm large-size optical fiber inverter is then polished with a polishing medium; The polishing medium includes the following substances in mass percentage: Rare earth oxide content is 61-70%; The lubricant content is 5-10%; The content of water is 20-25%; 1-5% for other substances; The other substances are selected from at least one of zinc nitrate, sodium carbonate and potassium carbonate; The Φ40mm large-size fiber optic inverter includes core glass and skin glass: The core glass has a refractive index of 1.79-1.82 and is composed of the following components in molar percentage ratio: SiO ₂ 20-25%, B ₂ O ₃ 19-27%, CaO 0.5-5%, SrO 1 -5%, BaO 15-25%, TiO ₂ 10-15%, La ₂ O ₃ 5-15%, Gd ₂ O ₃ 7.1-10%, Nb ₂ O ₅ 1-5%; The cladding glass has a refractive index of 1.48-1.51 and is composed of the following components in molar percentage: SiO ₂ 73.0-78.0%, Al ₂ O ₃ 1.0-5.0%, B ₂ O ₃ 1.0-5.0%, Na ₂ O 0.1-2.9%, K ₂ O 7.1-12.0%, MgO 5.1-10.0%, SrO 0.1-5.0%, ZnO 0.1-1.0%, F ₂ 1.1-2.5%. 2. the surface processing method of Φ 40mm large-scale optical fiber inverter according to claim 1, is characterized in that, described rare earth oxide is cerium oxide and lanthanum oxide, and the mass ratio of described cerium oxide and lanthanum oxide is (12 -16): 1, the particle size of the rare earth oxide is 0.5 μm to 3 μm. 3. the surface processing method of Φ 40mm large-scale optical fiber inverter according to claim 2, is characterized in that, described lubricant is at least one in ethylene glycol and sodium dodecylsulfonate; And/or the The water mentioned is tap water or deionized water. 4. The method for processing the surface of a Φ40mm large-size fiber optic inverter according to claim 2, wherein the particle size of the rare earth oxide is 1.0-2.0 μm. 5. according to the surface processing method of the described Φ 40mm large-scale fiber optic image inverter of any one of claim 1-4, it is characterized in that, the time of described ultrasonic cleaning treatment is 50-80 minute; The time of described polishing treatment is 0.5-2.0 hours; the polishing speed of the Φ40mm large-size fiber optic inverter is 150-300rad/min; the cleanliness of the polishing environment is above 100,000; the upper and lower planes of the Φ40mm large-size fiber optic inverter The amount of grinding and grinding is 0.04mm. 6. A Φ40mm large-size optical fiber image inverter, characterized in that it is obtained after being processed according to any one of claims 1-5. 7. A fiber optic image transmission component, characterized in that it comprises the Φ40mm large-size fiber optic image inverter according to claim 6. 8. An application of the optical fiber image transmission element according to claim 7 in a micro-light image intensifier.

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