CN101950045A

CN101950045A - Cross-layer hollow energy transmitting fiber

Info

Publication number: CN101950045A
Application number: CN 201010270172
Authority: CN
Inventors: 徐毅; 徐政; 曲艺
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-09-02
Filing date: 2010-09-02
Publication date: 2011-01-19

Abstract

The invention discloses a cross-layer hollow energy transmitting fiber. A polymethyl methacrylate (PMMA) tube is used as the base material. The cross-layer hollow energy transmitting fiber is characterized in that a titanium dioxide (TiO2) layer and a PMMA layer are alternately plated on the inner wall of the tube: a layer of TiO2 is plated on the tube wall, a layer of PMMA is plated on the TiO2 layer, a layer of TiO2 is again plated on the PMMA layer, the rest can be done in the same manner, and the last layer is TiO2 layer. As difference between the refractive indexes of the two materials is relatively large and the lattice constant of the fiber is greater than that of a light wave, the fiber structure prevents the spectrum periodically changing with the frequency of the light wave and is relatively suitable for sunlight transmission. The fiber has the following advantages that: 1, the transmission loss is still kept very low in the continuous spectrum range of sunlight; 2, the sectional area of the fiber is large and the diameter of the fiber core is 1,000 times that of a common fiber; and 3, the fiber has a simple structure and is easy to produce by scale.

Description

Hand over layer hollow energy-transmission optic fibre

Technical field

The present invention relates to sunshine conduction optical fiber.

Background technology

Transmit sun power with optical fiber, at first require the optical fiber sectional area big, can allow more sunlight be coupled into fibre core; Next requires optical fiber, and transfer efficiency is higher in the solar spectrum scope, loss is low, and can transmit higher energy for a long time, and is not yielding.Yet the numerical aperture of present most of optical fiber is little, with big light source coupling difficulty, and only under a certain wavelength or some wavelength loss low, even photonic crystal fiber, its bandgap range also is limited, so these optical fiber are not suitable for the sunshine transmission.The optical fiber of sun power conduction at present adopts hollow core structures more, the fibre core inwall has the high reflecting metal coating, and this optical fiber mainly is to improve the reflectivity of inwall by coating, but costs an arm and a leg, long Distance Transmission light loss is also very big, and the light-conductive rate of 10 meters distances is less than 30% in general.

Summary of the invention

The object of the present invention is to provide a kind of low-loss of sunshine transmission, big core diameter hollow-core fiber of being used for, can be widely used in the sunlight fibre and lead that energy storage is led in illumination, sunlight fibre, the sunlight fibre is led aspects such as generating.Technical solution of the present invention is a base material with polymethylmethacrylate (PMMA) pipe, it is characterized in that alternately making plating titania (TiO at inside pipe wall ₂) layer and polymethylmethacrylate (PMMA) layer, both on tube wall, made the plating layer of titanium dioxide earlier, again system plating one deck polymethylmethacrylate on titanium dioxide layer, system is plated layer of titanium dioxide on polymethyl methacrylate layers again, ..., by that analogy, last one deck is a titania.

TiO ₂/ PMMA alternating layer hollow energy-transmission optic fibre belongs to microstructured optical fibers, and leaded light mechanism is the Bragg reflection that light carries out in the covering of the periodicity concentric ring that is made of two kinds of different materials, TiO ₂Refractive index is 2.4, the PMMA refractive index is 1.48, because two kinds of material refringences are bigger, and this optical fiber grating constant is grown up than light wave, this optical fiber structure makes spectrum no longer be cyclical variation with frequency of light wave, can overcome the above-mentioned shortcoming of present optical fiber, relatively be fit to the sunshine transmission, this optical fiber has following advantage: 1, in sunlight continuous spectrum scope, it is very low that its loss still can keep, as simulation have two cycle covering hollow-core fibers, the luminous energy loss that just can obtain 50m transmission length is no more than 20% effect; 2, the optical fiber sectional area is big, and core diameter can be 1000 times of ordinary optic fibre; 3, optical fiber structure is simple, is easy to large-scale production.The spectral transmissions characteristic of this optical fiber if require the long Distance Transmission of solar energy, can reduce optical loss by the thickness and the number of plies decision of high refractive index layer by the number of plies that increases covering.

The present invention can be used for sunshine conduction illumination, and sunlight conduction illumination can be applicable to any space that needs sunlight, as the hypogee, and back room, the megastore of weak daylighting, hotel, exhibition room, mine tunnel, subway passage, vcehicular tunnel or the like; Also can be used for being incubated others such as illumination, aquaculture.At present, China's illumination power consumption accounts for about 15% of gross generation.China's gross generation will reach 45,000 hundred million kilowatt-hours in 2010, and the illumination power consumption will reach 6,750 hundred million degree, be equivalent to more than the octuple of Three Gorges hydro-electric power project annual electricity generating capacity (84,000,000,000 degree).Accounting for more than 50% of electric consumption on lighting according to expert statistics electric consumption on lighting on daytime, mainly is the commercial and industrial electricity consumption.Can save daytime electric consumption on lighting amount more than 50%, promptly be equivalent to annual electricity consumption 1,687 hundred million degree of saving, reduce discharging CO and popularize to use the sunlight fibre to lead illuminator ₂1.68 hundred million tons,, can save 1,350 hundred million yuan of the electricity charge Renminbi every year with 0.8 yuan of calculating of the electric Renminbi of every degree.

The technology of the long distance of the present invention, low-loss transmission sun power will improve China's sun power greatly and utilize level.The solar energy resources of China 70% is in western part, be transferred to the east by the optical fiber biography energy technology sun power that western part is abundant and carry out conversion using such as photoelectricity, photo-thermal again, this will realize western can failing in east from fundamental significance, thoroughly change the energy structure of China, this is significant to Chinese energy safety and sustainable development.

Description of drawings

Accompanying drawing is a structural profile synoptic diagram of the present invention.

Legend: 1, fiber optic protection layer, 2, polymethylmethacrylate (PMMA) pipe, 3, ground floor TiO ₂, 3, ground floor PMMA, 5, second layer TiO ₂Layer, 6, the hollow fibre core.

Embodiment

Present embodiment provides titania (TiO ₂) layer and polymethylmethacrylate (PMMA) layer hand over a layer hollow-core fiber, PMMA external diameter of pipe 7mm is TiO by the order ground floor of ecto-entad ₂Layer, thickness 15um, refractive index 2.4; The second layer is the PMMA layer, thickness 15um, refractive index 1.48; The 3rd layer is TiO ₂, layer thickness 10um, refractive index 2.4; Hollow core diameter 4mm, fiber core refractive index n ₀=1.0.Fibre coating is produced the employing sol-gel process, and whole process of preparation is finished on vertical optical fiber coating machine, by computation programmed control flow rate of liquid and temperature of reaction, the film layer structure densification of guaranteeing to prepare, smooth evenly, optical property is good.Required solution and cleaning fluid clean inside pipe wall earlier after preparing by the match ratio that designs by acid ﹠ alkali liquid; With the alcohol radical metatitanic acid is raw material, produces TiO with sol-gel process ₂Film is hybridly prepared into TiO with a certain proportion of metatitanic acid fourth fat, absolute ethyl alcohol and nitric acid ₂Solution after 12 hours, allows this solution feed the PMMA pipe with the magnetic stirrer stirring, strict control temperature of reaction, and time and flow velocity form TiO on the PMMA tube wall ₂Rete.TiO ₂After film preparation is finished, can be directly with in the PMMA acetone soln access tube for preparing, control flow velocity and time can obtain the good PMMA rete of optical property.Repeat above process and can alternately produce TiO ₂With the PMMA rete.Present embodiment only designs produces two TiO ₂The high reflectance rete, the luminous energy loss of its 50m transmission length is no more than 20%.

Claims

1. handing over layer hollow energy-transmission optic fibre, is base material with polymethylmethacrylate (PMMA) pipe, it is characterized in that alternately making plating titania (TiO at inside pipe wall ₂) layer and polymethylmethacrylate (PMMA) layer, both on tube wall, made the plating layer of titanium dioxide earlier, again system plating one deck polymethylmethacrylate on titanium dioxide layer, system is plated layer of titanium dioxide on polymethyl methacrylate layers again, ..., by that analogy, last one deck is a titania.