Cross-layer hollow energy transmitting fiber

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

technical field [0001] The present invention relates to solar light conducting optical fibers. Background technique [0002] The use of optical fibers to transmit solar energy requires that the cross-sectional area of ​​the optical fiber be large so that more sunlight can be coupled into the fiber core; secondly, the optical fiber is required to have high transmission efficiency and low transmission loss in the solar spectrum range, and to be able to transmit high energy for a long time ,Not easily deformed. However, most current fibers have small numerical apertures, are difficult to couple with large light sources, and have low loss only at a certain wavelength or a few wavelengths. Even photonic crystal fibers have a limited bandgap range, so these fibers are not suitable for solar light transmission. At present, most solar energy conduction optical fibers adopt a hollow core structure, and the inner wall of the fiber core has a highly reflective metal coating. This kin...

AI Technical Summary

Problems solved by technology

However, most current fibers have small numerical apertures, are difficult to couple with large light sources, and have low loss only at a certain wavelength or a few wavelengths. Even photonic crystal fibers have a limited bandgap range, so these fibers are not suitable for solar light transmission

At present, most solar energy conduction optical fibers adopt a hollow core structure, and the inner wall of the fiber core has a highly reflective metal coating. This kind of optical fiber mainly relies on the coating to improve the reflectivity of the inner wall, but it is expensive, and the long-distance transmission light loss is also large. Generally speaking Less than 30% light transmission at a distance of 10 meters

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