Fiber optic image inverter with ultra-short twister, fabrication method therefor, application thereof, and related composition

Abstract

The present application discloses a method for fabricating a fiber optic image inverter with an ultra-short twister. The method includes: drawing a glass rod with a low refractive index and a high strain point temperature into a surrounding pipe fiber; drawing a glass rod with a high refractive index and a high transmittance into a filling glass fiber, and then drawing into a casing pipe absorption fiber; uniformly surrounding an outer side of a cladding glass pipe with the surrounding pipe fiber, and matching a core glass rod and the cladding glass pipe to be drawn into a mono fiber; and then performing fabrication of a multi fiber, fabrication of a multi-multi fiber, heat press fusion and twisting operation in sequence. The fiber optic image inverter with an ultra-short twister with a high resolution and a high contrast and clear imaging is obtained and applied in a low-light-level image intensifier.

Claims

1. A method for fabricating a fiber optic image inverter with an ultra-short twister, wherein the method comprises the following steps: (1) surrounding pipe fiber drawing: drawing a round glass rod with a low refractive index and a high strain point temperature into the surrounding pipe fiber with 1.6-2.0 mm; (2) filling glass fiber drawing: drawing a glass rod with a high refractive index and a high transmittance into the filling glass fiber; (3) casing pipe absorption fiber drawing: preparing a light absorption glass with a light absorption property into a light absorption glass rod, matching the light absorption glass rod and a cladding glass pipe, and then drawing into the casing pipe absorption fiber; (4) mono fiber drawing: uniformly surrounding an outer side of the cladding glass pipe with the surrounding pipe fiber, then matching a core glass rod with a high refractive index and the cladding glass pipe surrounded with the surrounding pipe fiber, and then performing drawing of the mono fiber to obtain the drawn mono fiber, wherein a diameter of the mono fiber is the same as a diameter of the casing pipe absorption fiber; (5) multi fiber drawing: arranging the drawn mono fibers into a multi assembly rod with an orthohexagonal cross section, wherein the number of mono fibers on each side in the multi assembly rod is N, replacing one mono fiber arranged at a center of the hexagonal multi assembly rod with the casing pipe absorption fiber, and filling and inserting the filling glass fibers into a hole of the multi assembly rod; followed by drawing the multi assembly rod into the multi fiber; (6) multi-multi fiber drawing: arranging the drawn multi fibers into a multi-multi assembly rod with an orthohexagonal cross section, then drawing the multi-multi assembly rod into the multi-multi fiber, and then cutting the multi-multi fiber with a fixed length to be arranged into a fiber assembly bundle; (7) heat press fusion: putting the arranged fiber assembly bundle in a heat press fusion mold, then putting the heat press fusion mold in a heat press fusion furnace, performing heat press fusion according to a designed compression ratio of the fiber assembly bundle before and after heat press fusion, and obtaining a fused boule after heat press fusion; and (8) twisting operation: subjecting the fused boule to cutting, rounding and grinding machining treatments to obtain a fiber optic image inverter block, and subjecting the fiber optic image inverter block to a 180 twisting operation in an ultra-short high-temperature twisting furnace to obtain a fiber optic image inverter with an ultra-short twister; wherein a heating furnace body in the ultra-short high-temperature twisting furnace has a width ranging from 3 mm to 4 mm, a distance from the heating furnace body to a surface of the fiber optic image inverter block ranges from 1.0 mm to 2.5 mm, and twisting operation time for twisting the fiber optic image inverter block by 180 ranges from 2 minutes to 9 minutes; wherein a composition for fabricating a surrounding pipe fiber is composed of the following components by mole percentage content: TABLE-US-00010 SiO.sub.2 78.1-80.0% Al.sub.2O.sub.3 3.1-7.0% B.sub.2O.sub.3 2.0-8.0% Li.sub.2O 0.0001-1.0% Na.sub.2O 0-2.9% K.sub.2O 5.1-10.0% CaO 1.1-3.0% SrO 0.0001-1.0% ZnO 1.1-2.0% TiO.sub.2 0.0001-1.0% CeO.sub.2 0.05-0.2% MgF.sub.2 0.0001-2.0% CaF.sub.2 0.05-2.0%.

2. The method according to claim 1, wherein the filling glass fiber is triangular and has a height ranging from 0.50 mm to 0.95 mm; and a diameter of the mono fiber ranges from @2.4 mm to $4.20 mm; wherein the total number of mono fibers arranged into the multi assembly rod is (3N(N1)+1), wherein 8N3; sizes of hexagonal opposite sides of the multi fiber range from 1.10 mm to 1.30 mm; and sizes of hexagonal opposite sides of the multi-multi fiber range from 0.86 mm to 1.06 mm.

3. The method according to claim 2, wherein a glass of the surrounding pipe fiber has a refractive index ranging from 1.48 to 1.51; and a mean linear thermal expansion coefficient is (805)10.sup.7/ C. within a range from 30 C. to 300 C., the glass of the surrounding pipe fiber has a strain point temperature ranging from 580 C. to 620 C., an expansion softening temperature ranging from 680 C. to 710 C. and a temperature ranging from 780 C. to 810 C. in viscosity of 10.sup.7.6 dPa.Math.s, a glass of the surrounding pipe fiber and a glass of a core glass rod have the same temperature at a torsion viscosity point of 10.sup.7.6 dPa.Math.s, and the glass of the surrounding pipe fiber has neither devitrification nor phase separation after being subjected to heat preservation for 6 hours at a temperature ranging from 850 C. to 900 C.

4. The method according to claim 1, wherein the composition for fabricating a surrounding pipe fiber is composed of the following components by mole percentage content: TABLE-US-00011 SiO.sub.2 78.2-79.5% Al.sub.2O.sub.3 3.5-6.5% B.sub.2O.sub.3 3.0-5.5% Li.sub.2O 0.1-1.0% Na.sub.2O 0.1-2.9% K.sub.2O 6.7-10.0% CaO 1.1-3.0% SrO 0.1-1.0% ZnO 1.1-2.0% TiO.sub.2 0.01-1.0% CeO.sub.2 0.05-0.2% MgF.sub.2 0.05-2.0% CaF.sub.2 0.05-2.0%.

5. The method according to claim 4, wherein a glass of the surrounding pipe fiber has a refractive index ranging from 1.48 to 1.51; and a mean linear thermal expansion coefficient is (805)10.sup.7/ C. within a range from 30 C. to 300 C., the glass of the surrounding pipe fiber has a strain point temperature ranging from 580 C. to 620 C., an expansion softening temperature ranging from 680 C. to 710 C. and a temperature ranging from 780 C. to 810 C. in viscosity of 10.sup.7.6 dPa.Math.s, a glass of the surrounding pipe fiber and a glass of a core glass rod have the same temperature at a torsion viscosity point of 10.sup.7.6 dPa.Math.s, and the glass of the surrounding pipe fiber has neither devitrification nor phase separation after being subjected to heat preservation for 6 hours at a temperature ranging from 850 C. to 900 C.

6. The method according to claim 1, wherein a glass of the surrounding pipe fiber has a refractive index ranging from 1.48 to 1.51; and a mean linear thermal expansion coefficient is (805)10.sup.7/ C. within a range from 30 C. to 300 C., the glass of the surrounding pipe fiber has a strain point temperature ranging from 580 C. to 620 C., an expansion softening temperature ranging from 680 C. to 710 C. and a temperature ranging from 780 C. to 810 C. in viscosity of 10.sup.7.6 dPa.Math.s, a glass of the surrounding pipe fiber and a glass of a core glass rod have the same temperature at a torsion viscosity point of 10.sup.7.6 dPa.Math.s, and the glass of the surrounding pipe fiber has neither devitrification nor phase separation after being subjected to heat preservation for 6 hours at a temperature ranging from 850 C. to 900 C.

7. The method according to claim 1, wherein the composition for fabricating a filling glass fiber is composed of the following components by mole percentage content: TABLE-US-00012 SiO.sub.2 15.0-25.0% Al.sub.2O.sub.3 0.0001-0.5% B.sub.2O.sub.3 20.0-30.0% MgO 1.01-2.0% SrO 1.0-5.0% BaO 15.0-25.0% ZnO 0.5-2.0% SnO.sub.2 0.1-0.2% TiO.sub.2 5.0-9.0% WO.sub.3 1.0-5.0% La.sub.2O.sub.3 5.0-10.0% Nb.sub.2O.sub.5 1.0-5.0% Y.sub.2O.sub.3 0.5-2.0% Ta.sub.2O.sub.5 1.1-5.0% Gd.sub.2O.sub.3 0.0001-0.9%.

8. The method according to claim 7, wherein the composition for fabricating a filling glass fiber is composed of the following components by mole percentage content: TABLE-US-00013 SiO.sub.2 19.0-25.0% Al.sub.2O.sub.3 0.1-0.5% B.sub.2O.sub.3 25.0-30.0% MgO 1.01-2.0% SrO 1.0-5.0% BaO 15.0-25.0% ZnO 0.5-2.0% SnO.sub.2 0.1-0.2% TiO.sub.2 5.0-9.0% WO.sub.3 1.0-5.0% La.sub.2O.sub.3 5.0-9.0% Nb.sub.2O.sub.5 1.0-5.0% Y.sub.2O.sub.3 0.5-2.0% Ta.sub.2O.sub.5 1.1-5.0% Gd.sub.2O.sub.3 0.1-0.9%.

9. The method according to claim 8, wherein glass of the filling glass fiber has a refractive index ranging from 1.80 to 1.82; a mean linear thermal expansion coefficient is (905)10.sup.7/ C. within a range from 30 C. to 300 C., the glass of the filling glass fiber has a strain point temperature ranging from 610 C. to 630 C., and the glass of the filling glass fiber has a transmittance greater than 95% within a spectrum of 400 nm to 700 nm and has neither devitrification nor phase separation after being subjected to heat preservation for 6 hours at a temperature ranging from 850 C. to 900 C.

10. The method according to claim 7, wherein glass of the filling glass fiber has a refractive index ranging from 1.80 to 1.82; a mean linear thermal expansion coefficient is (905)10.sup.7/ C. within a range from 30 C. to 300 C., the glass of the filling glass fiber has a strain point temperature ranging from 610 C. to 630 C., and the glass of the filling glass fiber has a transmittance greater than 95% within a spectrum of 400 nm to 700 nm and has neither devitrification nor phase separation after being subjected to heat preservation for 6 hours at a temperature ranging from 850 C. to 900 C.

11. The method according to claim 1, wherein a composition for light absorption glass is composed of the following components by mole percentage content: TABLE-US-00014 SiO.sub.2 71.0-80.0% Al.sub.2O.sub.3 0.5-5.0% B.sub.2O.sub.3 1.0-5.0% Na.sub.2O 1.0-11.0% K.sub.2O 6.0-11.0% MgO 0.1-2.0% CaO 0.1-2.0% BaO 0.0001-0.04% TiO.sub.2 0.0001-1.0% Co.sub.2O.sub.3 0.1-0.4% NiO 0.1-1.0% MnO 1.0-5.0% V.sub.2O.sub.3 0.1-1.0% CeO.sub.2 0.0001-0.2% CuO 0.0001-0.05%.

12. The method according to claim 11, wherein the composition for light absorption glass is composed of the following components by mole percentage content: TABLE-US-00015 SiO.sub.2 74.0-80.0% Al.sub.2O.sub.3 1.5-5.0% B.sub.2O.sub.3 1.0-5.0% Na.sub.2O 5.1-11.0% K.sub.2O 8.1-11.0% MgO 0.1-2.0% CaO 0.1-2.0% BaO 0.01-0.04% TiO.sub.2 0.01-1.0% Co.sub.2O.sub.3 0.1-0.4% NiO 0.1-1.0% MnO 1.0-5.0% V.sub.2O.sub.3 0.1-1.0% CeO.sub.2 0.01-0.2% CuO 0.01-0.05%.

13. The method according to claim 12, wherein the light absorption glass has a uniform light absorption ability and a spectral absorption effect under a thickness of 0.50.01 mm and within a wavelength range from 510 nm to 660 nm, and has a spectrum transmittance less than or equal to 3.0%; the light absorption glass has a thermal expansion coefficient of (855)10.sup.7/ C.; and neither devitrification nor phase separation occurs after being subjected to heat preservation for 6 hours at a temperature ranging from 850 C. to 900 C.

14. The method according to claim 11, wherein the light absorption glass has a uniform light absorption ability and a spectral absorption effect under a thickness of 0.50.01 mm and within a wavelength range from 510 nm to 660 nm, and has a spectrum transmittance less than or equal to 3.0%; the light absorption glass has a thermal expansion coefficient of (855)10.sup.7/ C.; and neither devitrification nor phase separation occurs after being subjected to heat preservation for 6 hours at a temperature ranging from 850 C. to 900 C.

15. A fiber optic image inverter with an ultra-short twister fabricated by the method according to claim 1, wherein the fiber optic image inverter with an ultra-short twister has an overall height not more than 15 mm and a weight less than 20 g; optical crosstalk of the fiber optic image inverter with an ultra-short twister in a position 0.1 mm away from a cutter edge is less than 1.0%; the fiber optic image inverter with an ultra-short twister has a fiber diameter not more than 4.0 micrometers; the fiber optic image inverter with an ultra-short twister has a resolution at center greater than 140 lp/mm and resolution at edge greater than 110 lp/mm; the fiber optic image inverter with an ultra-short twister has a transmittance greater than 70% within a wavelength range from 400 nm to 700 nm; and the fiber optic image inverter with an ultra-short twister has no multifiber boundary after being observed under a 10 microscope.

16. Application of the fiber optic image inverter with an ultra-short twister according to claim 15 in a low-light-level image intensifier.

17. The application according to claim 16, wherein the low-light-level image intensifier is applied to a helmet night-vision device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic diagram of arranging a surrounding pipe fiber on an outer layer of a cladding glass pipe provided by an embodiment of the present application.

(2) FIG. 2 is a schematic diagram of a multi fiber of a fiber optic image inverter with ultra-short twister provided by an embodiment of the present application.

(3) FIG. 3 is a viscosity fitting curve of core glass and surrounding pipe fiber glass provided by an embodiment of the present application.

(4) FIG. 4 is a transmittance curve of light absorption glass provided by an embodiment of the present application.

(5) FIG. 5 is a schematic diagram of an ultra-short high-temperature twisting heating furnace provided by an embodiment of the present application.

(6) FIG. 6 is a schematic diagram of application of a fiber optic image inverter with ultra-short twister in a low-light-level image intensifier provided by an embodiment of the present application.

(7) FIG. 7 is a schematic diagram of application of a fiber optic image inverter with ultra-short twister in a low-light-level image intensifier and then in a helmet night-vision device provided by an embodiment of the present application.

(8) In the accompanying drawings: 1: cladding glass pipe, 2: surrounding pipe fiber, 3: filling glass fiber, 4: casing pipe absorption fiber, 5: core glass fiber, and 6: cladding glass surrounded with a fiber; 601: low-light-level image intensifier, 602: fiber optic image inverter with ultra-short twister, 603: image under a low-light level, and 604: intensified image; 701: helmet night-vision device, 702: helmet, and 703: wearer; and 801: ultra-short high-temperature twisting furnace, 802: heating body in the ultra-short high-temperature heating furnace, and 803: fiber optic image inverter block.

DETAILED DESCRIPTION

(9) In order to make objectives, technical solutions and advantages of the present application clearer, implementations of the present application will be further described in detail below. The present application is further described in detail below with reference to the accompanying drawings and the specific implementations, which does not serve as a limitation on the present application.

(10) Referring to FIG. 1, an outer side of a cladding glass pipe 1 is uniformly surrounded with a surrounding pipe fiber 2, a core glass fiber 5 is inserted into the cladding glass pipe 1, and the above matching rod-pipe combined body is drawn into a mono fiber.

(11) Referring to FIG. 2, the core glass fiber 5 is arranged in cladding glass 6 surrounded with the fiber to form the mono fiber; the mono fibers are arranged into a multi assembly rod with a hexagonal cross section according to six mono fibers on each side, then a mono fiber arranged at a very center of the hexahedron multi assembly rod is replaced with the casing pipe absorption fiber 4, and a triangular filling glass fiber 3 is filled and inserted into a triangular hole of the multi assembly rod; and the above multi assembly rod obtained after combination is drawn into the multi fiber as shown in FIG. 2.

(12) Referring to FIG. 3, in FIG. 3, the high-temperature viscosity fitting curve of glass of the surrounding pipe fiber 2 and the core glass fiber 5 have the same temperature at a torsion viscosity point of 10.sup.7.6 dPa.Math.s, so that the resolution at edge of a fabricated fiber optic image inverter with ultra-short twister can be greater than 110 lp/mm.

(13) Referring to FIG. 4, which is a transmittance curve of a light absorption material, it can be seen that the light absorption ability and the spectral absorption effect are strong and uniform within a wavelength range from 510 nm to 660 nm, a spectrum transmittance is less than or equal to 3.0%, and thus the contrast of the fabricated fiber optic image inverter with ultra-short twister can be less than or equal to 1.0%.

(14) Referring to FIG. 5, which is a schematic diagram of an ultra-short high-temperature twisting heating furnace, heating body in the ultra-short high-temperature heating furnace 802 is arranged in the twisting furnace 801, a fiber optic image inverter block 803 is subjected to 180 twisting operation after being heated by the heating body in the ultra-short high-temperature heating furnace 802 in the ultra-short high-temperature twisting furnace 801, and the fiber optic image inverter with ultra-short twister is obtained.

(15) Referring to FIG. 6, which is application of the fiber optic image inverter with ultra-short twister in a low-light-level image intensifier, the fiber optic image inverter with ultra-short twister 602 fabricated by the present application is applied to the low-light-level image intensifier 601, and an image 603 under a low-light level can be transformed into an intensified image 604 by using the low-light-level image intensifier 601.

(16) Referring to FIG. 7, which is application of the fiber optic image inverter with ultra-short twister in a helmet night-vision device, the fiber optic image inverter with ultra-short twister 602 fabricated by the present application is applied to the low-light-level image intensifier 601, and finally the helmet night-vision device 701 is fabricated and mounted in a helmet 702, and a wearer 703 wears the helmet for use.

(17) All mole percentages mol. % herein are based on an integral mole quantity of a final glass composition. Parameters measured for high-refractive index filling glass used for a fiber optic image element in the present application, measurement methods and instruments are as follows. (1) Refractive index np is a refractive index of glass when =589.3 nm, which is measured by using a refractometer. (2) A mean linear thermal expansion coefficient .sub.30/300[10.sup.7/ C.] at a temperature ranging from 30 C. to 300 C. is measured by using a horizontal dilatometer and measured by a method specified in GB/T 16920-2015. (3) The strain point temperature of the glass is measured by a bent beam method specified in GB/T 28196-2011. (4) The transmittance of the glass is measured by a transmittance device.

(18) Chemical compositions (mol. %) of the glass in embodiments are listed in details in Table 1, Table 2 and Table 3.

(19) TABLE-US-00007 TABLE 1 Chemical compositions (mol. %) and properties of embodiments of the surrounding pipe fiber glass Composition (mol. %) Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 SiO.sub.2 78.30 78.40 80.00 78.20 78.10 Al.sub.2O.sub.3 5.30 3.40 3.10 7.00 3.50 B.sub.2O.sub.3 3.00 8.00 2.00 2.10 2.20 Li.sub.2O 0.10 0.20 1.00 0.11 0.10 Na.sub.2O 2.90 0.20 0.30 0.10 0.20 K.sub.2O 6.70 5.10 8.25 7.90 10.00 CaO 1.30 1.20 2.10 1.10 3.00 SrO 0.20 0.10 1.00 0.10 0.20 ZnO 1.10 1.27 1.10 1.12 2.00 TiO.sub.2 0.50 0.01 1.00 0.01 0.30 CeO.sub.2 0.09 0.06 0.05 0.20 0.10 MgF.sub.2 0.11 2.00 0.05 0.06 0.20 CaF.sub.2 0.40 0.06 0.05 2.00 0.10 .sub.30/300 [10.sup.7/ C.] 83 81 84 82 85 Strain point temperature 610 585 680 620 590 Refractive index n.sub.D 1.49 1.48 1.51 1.48 1.50

(20) TABLE-US-00008 TABLE 2 Chemical compositions (mol. %) and properties of embodiments of the filling glass fiber Composition (mol. %) Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 SiO.sub.2 22.7 20.31 25.00 15.00 17.00 Al.sub.2O.sub.3 0.1 0.15 0.25 0.50 0.30 B.sub.2O.sub.3 26.8 24.33 20.00 28.60 30.00 MgO 1.01 1.16 1.65 2.00 1.85 SrO 3.4 3.7 1.00 4.20 5.00 BaO 16.2 21.85 25.00 15.00 24.10 ZnO 0.5 2.0 1.70 1.60 1.50 SnO.sub.2 0.1 0.16 0.20 0.14 0.18 TiO.sub.2 8.07 8.61 5.00 9.00 5.37 WO.sub.3 4.0 1.0 3.00 5.00 2.00 La.sub.2O.sub.3 7.67 7.55 9.00 10.00 5.00 Nb.sub.2O.sub.5 3.22 3.53 5.00 3.10 1.00 Y.sub.2O.sub.3 0.5 1.42 1.20 1.80 2.00 Ta.sub.2O.sub.5 5.0 4.13 1.10 3.26 4.00 Gd.sub.2O.sub.3 0.73 0.1 0.90 0.80 0.70 .sub.30/300 [10.sup.7/ C.] 85 90 89 91 87 Refractive index 1.81 1.82 1.82 1.8 1.81

(21) TABLE-US-00009 TABLE 3 Chemical compositions (mol. %) and properties of embodiments of the light absorption glass Composition (mol. %) Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 SiO.sub.2 76.00 71.00 80.00 77.66 73.13 Al.sub.2O.sub.3 2.00 1.93 0.50 1.27 5.00 B.sub.2O.sub.3 3.50 5.00 3.04 1.00 1.82 Na.sub.2O 5.10 11.00 1.00 2.09 6.46 K.sub.2O 8.20 6.00 11.00 8.26 7.80 MgO 0.30 0.10 0.16 2.00 0.25 CaO 1.70 0.10 2.00 0.58 1.19 BaO 0.02 0.01 0.04 0.03 0.02 TiO.sub.2 0.02 0.14 0.01 0.73 1.00 Co.sub.2O.sub.3 0.20 0.40 0.10 0.31 0.28 NiO 0.50 0.88 1.00 0.70 0.10 MnO 1.90 2.86 1.00 5.00 1.88 V.sub.2O.sub.3 0.45 0.54 0.10 0.16 1.00 CeO.sub.2 0.06 0.02 0.01 0.20 0.04 CuO 0.05 0.02 0.04 0.01 0.03 Visible light transmittance 2.3% 1.7% 2.8% 1.0% 2.1% (0.5 mm in thickness) .sub.30/300 [10.sup.7/ C.] 83 87 81 83 85

Embodiment 1

(22) A method for fabricating a fiber optic image inverter with ultra-short twister includes the following steps: (1) surrounding pipe fiber drawing: a round glass rod with a low refractive index and a high strain point temperature is fabricated according to a glass composition in Embodiment 1 of Table 1, and the round glass rod is drawn into the surrounding pipe fiber of 1.8 mm; (2) filling glass fiber drawing: a triangular glass rod with a high refractive index and a high transmittance is fabricated according to a glass composition of Embodiment 1 of Table 2, and the triangular glass rod is drawn into a triangular filling glass fiber, wherein the triangular filling glass fiber has a height of 0.63 mm; (3) casing pipe absorption fiber drawing: light absorption glass with a good light absorption property is prepared into a light absorption material glass rod according to a glass composition of Embodiment 1 of Table 3, and then the light absorption material glass rod and a cladding glass pipe match to be drawn into the casing pipe absorption fiber of 2.8 mm; (4) mono fiber drawing: an outer side of the cladding glass pipe is uniformly surrounded with the surrounding pipe fiber, and then a core glass rod with a high refractive index and the cladding glass pipe surrounded with the surrounding pipe fiber match to be subjected to mono fiber drawing to obtain the drawn mono fiber, wherein the diameter of the mono fiber is 2.8 mm; (5) multi fiber drawing: the drawn mono fibers are arranged into a multi assembly rod with an orthohexagonal cross section, wherein the number of mono fibers on each side in the multi assembly rod is 6, and the total number of the mono fibers arranged into the multi assembly rod is 91; a mono fiber arranged at a very center of the hexahedron multi assembly rod is replaced with the casing pipe absorption fiber, wherein the fiber diameter of the replaced mono fiber is the same as a fiber diameter of the substituting casing pipe absorption fiber; the triangular glass fibers are filled and inserted into the triangular hole of the multi assembly rod; and the above multi assembly rod obtained after combination is drawn into the multi fiber, wherein a size of hexagonal opposite sides of the multi fiber is 1.27 mm; (6) multi-multi fiber drawing: the drawn multi fibers are arranged into a multi-multi assembly rod with an orthohexagonal cross section, wherein the number of multi fibers on each side of the multi-multi assembly rod is 12; then the multi-multi assembly rod is drawn into the multi-multi fiber, wherein a size of hexagonal opposite sides of the multi-multi fiber is 0.91 mm; and then the multi-multi fiber is cut with a fixed length to be arranged into a fiber assembly bundle; (7) heat press fusion: the arranged fiber assembly bundle is put in a heat press fusion mold, then the heat press fusion mold is put in a heat press fusion furnace, heat press fusion is performed according to a designed compression ratio of the fiber assembly bundle before and after heat press fusion, and a fused boule is obtained after heat press fusion; (8) twisting operation: the fused boule is subjected to cutting, rounding and grinding machining treatments to obtain a fiber optic image inverter block, and the fiber optic image inverter block is subjected to 180 twisting operation in an ultra-short high-temperature twisting furnace, wherein a heating furnace body in the twisting furnace has a width of 3 mm, a distance from the heating furnace body to a surface of the fiber optic image inverter block is 1.0 mm, and twisting operation time for twisting the fiber optic image inverter with ultra-short twister block by 180 is 5 minutes; and then a fiber optic image inverter with ultra-short twister with a fiber diameter being 3.96 m, a high resolution and a high contrast is obtained.

(23) The fabricated fiber optic image inverter with ultra-short twister has a height of 15 mm and a weight of 19.4 g, and optical crosstalk at a position 0.1 mm away from a cutter edge is 0.94%; a center resolution is 143 lp/mm, and a resolution at edge is 114 lp/mm; a good light transmission property is achieved, and a transmittance within a wavelength range from 400 nm to 700 nm is 72%; and a good fixed-pattern noise property is achieved, and there is no obvious multifiber boundary after being observed under a 10 microscope.

Embodiment 2

(24) A method for fabricating a fiber optic image inverter with ultra-short twister includes the following steps: (1) surrounding pipe fiber drawing: a round glass rod with a low refractive index and a high strain point temperature is fabricated according to a glass composition in Embodiment 2 of Table 1, and the round glass rod is drawn into the surrounding pipe fiber of 1.6 mm; (2) filling glass fiber drawing: a regular triangle glass rod with a high refractive index and a high transmittance is fabricated according to a glass composition of Embodiment 2 of Table 2, and the regular triangle glass rod is drawn into a triangular filling glass fiber, wherein the triangular filling glass fiber has a height of 0.95 mm; (3) casing pipe absorption fiber drawing: light absorption glass with a good light absorption property is prepared into a light absorption glass rod according to a glass composition of Embodiment 2 of Table 3, and then the light absorption glass rod and a cladding glass pipe match to be drawn into the casing pipe absorption fiber of 4.2 mm; (4) mono fiber drawing: an outer side of the cladding glass pipe is uniformly surrounded with the surrounding pipe fiber, and then a core glass rod with a high refractive index and the cladding glass pipe surrounded with the surrounding pipe fiber match to be subjected to mono fiber drawing to obtain the drawn mono fiber, wherein the diameter of the mono fiber is 4.2 mm; (5) multi fiber drawing: the drawn mono fibers are arranged into a multi assembly rod with an orthohexagonal cross section, wherein the number of mono fibers on each side in the multi assembly rod is 5, and the total number of the mono fibers arranged into the multi assembly rod is 61; a mono fiber arranged at a very center of the hexahedron multi assembly rod is replaced with the casing pipe absorption fiber, wherein the diameter of the replaced mono fiber is the same as the diameter of the substituting casing pipe absorption fiber; the triangular glass fibers are filled and inserted into the triangular hole of the multi assembly rod; and the above multi assembly rod obtained after combination is drawn into the multi fiber, wherein a size of hexagonal opposite sides of the multi fiber is 1.10 mm; (6) multi-multi fiber drawing: the drawn multi assemblies are arranged into a multi-multi assembly rod with an orthohexagonal cross section, wherein the number of multi fibers on each side of the multi-multi assembly rod is 14; then the multi-multi assembly rod is drawn into the multi-multi fiber, wherein a size of hexagonal opposite sides of the multi-multi fiber is 0.88 mm; and then the multi-multi fiber is cut with a fixed length to be arranged into a fiber assembly bundle; (7) heat press fusion: the arranged fiber assembly bundle is put in a heat press fusion mold, then the heat press fusion mold is put in a heat press fusion furnace, heat press fusion is performed according to a designed compression ratio of the fiber assembly bundle before and after heat press fusion, and a fused boule is obtained after heat press fusion; (8) twisting operation: the fused boule is subjected to cutting, rounding and grinding machining treatments to obtain a fiber optic image inverter block, and the fiber optic image inverter block is subjected to 180 twisting operation in an ultra-short high-temperature twisting furnace, wherein heating body in an ultra-short high-temperature heating furnace has a width of 3.5 mm, a distance from the heating body of the heating furnace to a surface of the fiber optic image inverter block is 1.2 mm, and twisting operation time for twisting the fiber optic image inverter with ultra-short twister block by 180 is 3 minutes; and then a fiber optic image inverter with ultra-short twister with a fiber diameter being 3.94 m, a high resolution and a high contrast is obtained.

(25) The fabricated fiber optic image inverter with ultra-short twister has a height of 14.9 mm and a weight of 19.3 g, and optical crosstalk at a position 0.1 mm away from a cutter edge is 0.96%; a center resolution is 143 lp/mm, and a resolution at edge is 128 lp/mm; a good light transmission property is achieved, and a transmittance within a wavelength range from 400 nm to 700 nm is 71%; and a good fixed-pattern noise property is achieved, and there is no obvious multifiber boundary after being observed under a 10 microscope.

Embodiment 3

(26) A method for fabricating a fiber optic image inverter with ultra-short twister includes the following steps: (1) surrounding pipe fiber drawing: a round glass rod with a low refractive index and a high strain point temperature is fabricated according to a glass composition in Embodiment 3 of Table 1, and the round glass rod is drawn into the surrounding pipe fiber of 2.0 mm; (2) filling glass fiber drawing: a regular triangle glass rod with a high refractive index and a high transmittance is fabricated according to a glass composition of Embodiment 3 of Table 2, and the regular triangle glass rod is drawn into a triangular filling glass fiber, wherein the triangular filling glass fiber has a height of 0.5 mm; (3) casing pipe absorption fiber drawing: light absorption glass with a good light absorption property is prepared into a light absorption glass rod according to a glass composition of Embodiment 3 of Table 3, and then the light absorption glass rod and a cladding glass pipe match to be drawn into the casing pipe absorption fiber of 2.4 mm; (4) mono fiber drawing: an outer side of the cladding glass pipe is uniformly surrounded with the surrounding pipe fiber, and then a core glass rod with a high refractive index and the cladding glass pipe surrounded with the surrounding pipe fiber match to be subjected to mono fiber drawing to obtain the drawn mono fiber, wherein the diameter of the mono fiber is 2.4 mm; (5) multi fiber drawing: the drawn mono fibers are arranged into a multi assembly rod with an orthohexagonal cross section, wherein the number of mono fibers on each side in the multi assembly rod is 7, and the total number of the mono fibers arranged into the multi assembly rod is 127; a mono fiber arranged at a very center of the hexahedron multi assembly rod is replaced with the casing pipe absorption fiber, wherein the diameter of the replaced mono fiber is the same as the diameter of the substituting casing pipe absorption fiber; the triangular glass fibers are filled and inserted into the triangular hole of the multi assembly rod; and the above multi assembly rod obtained after combination is drawn into the multi fiber, wherein a size of hexagonal opposite sides of the multi fiber is 1.30 mm; (6) multi-multi fiber drawing: the drawn multi fibers are arranged into a multi-multi assembly rod with an orthohexagonal cross section, wherein the number of multi fibers on each side of the multi-multi assembly rod is 11; then the multi-multi assembly rod is drawn into the multi-multi fiber, wherein a size of hexagonal opposite sides of the multi-multi fiber is 0.96 mm; and then the multi-multi fiber is cut with a fixed length to be arranged into a fiber assembly bundle; (7) heat press fusion: the arranged fiber assembly bundle is put in a heat press fusion mold, then the heat press fusion mold is put in a heat press fusion furnace, heat press fusion is performed according to a designed compression ratio of the fiber assembly bundle before and after heat press fusion, and a fused boule is obtained after heat press fusion; (8) twisting operation: the fused boule is subjected to cutting, rounding and grinding machining treatments to obtain a fiber optic image inverter block, and the fiber optic image inverter block is subjected to 180 twisting operation in an ultra-short high-temperature twisting furnace, wherein the heating body in an ultra-short high-temperature heating furnace has a width of 4.0 mm, a distance from the heating body of the heating furnace to a surface of the fiber optic image inverter block is 1.5 mm, and twisting operation time for twisting the fiber optic image inverter with ultra-short twister block by 180 is 6 minutes; and then a fiber optic image inverter with ultra-short twister with a fiber diameter being 3.92 m, a high resolution and a high contrast is obtained.

(27) The fabricated fiber optic image inverter with ultra-short twister has a height of 15.0 mm and a weight of 19.4 g, and optical crosstalk at a position 0.1 mm away from a cutter edge is 0.92%; a center resolution is 143 lp/mm, and a resolution at edge is 128 lp/mm; a good light transmission property is achieved, and a transmittance within a wavelength range from 400 nm to 700 nm is 74%; and a good fixed-pattern noise property is achieved, and there is no obvious multifiber boundary after being observed under a 10 microscope.

Embodiment 4

(28) An actual composition of glass refers to a composition in Embodiment 4 of Table 1, Table 2 and Table 3, and a fiber optic image inverter with ultra-short twister is fabricated by a method the same as Embodiment 1.

(29) The fabricated fiber optic image inverter with ultra-short twister has a height of 15.0 mm and a weight of 19.3 g, and optical crosstalk at a position 0.1 mm away from a cutter edge is 0.96%; a center resolution is 143 lp/mm, and a resolution at edge is 114 lp/mm; a good light transmission property is achieved, and a transmittance within a wavelength range from 400 nm to 700 nm is 73%; and a good fixed-pattern noise property is achieved, and there is no obvious multifiber boundary after being observed under a 10 microscope.

Embodiment 5

(30) An actual composition of glass refers to a composition in Embodiment 5 of Table 1, Table 2 and Table 3, and a fiber optic image inverter with ultra-short twister is fabricated by a method the same as Embodiment 1.

(31) The fabricated fiber optic image inverter with ultra-short twister has a height of 15.0 mm and a weight of 19.3 g, and optical crosstalk at a position 0.1 mm away from a cutter edge is 0.93%; a center resolution is 143 lp/mm, and a resolution at edge is 114 lp/mm; a good light transmission property is achieved, and a transmittance within a wavelength range from 400 nm to 700 nm is 72%; and a good fixed-pattern noise property is achieved, and there is no obvious multifiber boundary after being observed under a 10 microscope.

(32) The above embodiments are merely one type of optional specific implementations of the present application, and general variations and replacements made by those skilled in the art within the scope of the technical solution of the present application are supposed to be covered within the protection scope of the present application.