Porous aluminum oxide film light filter with bifurcate holes and preparation method thereof

Abstract

The invention discloses a porous aluminum oxide film light filter with branching holes and a preparation method thereof. A light filter is provided with the holes of a porous aluminum oxide film, whicThe invention discloses a porous aluminum oxide film light filter with branching holes and a preparation method thereof. A light filter is provided with the holes of a porous aluminum oxide film, whicin the wave amplitude of the curved tooth wave voltage is 22V to 50V, the wave front is of 45 degrees, and the wave period is 2.5 minutes to 3.5 minutes; then a porous aluminum oxide film light fiherein the wave amplitude of the curved tooth wave voltage is 22V to 50V, the wave front is of 45 degrees, and the wave period is 2.5 minutes to 3.5 minutes; then a porous aluminum oxide film light filter with bifurcate holes is prepared; the purity of the aluminium sheet is no less than 99.9 percent; and the anodic oxidation is carried out for 14 hours to 20 hours under the curved tooth wave voltlter with bifurcate holes is prepared; the purity of the aluminium sheet is no less than 99.9 percent; and the anodic oxidation is carried out for 14 hours to 20 hours under the curved tooth wave voltage. The porous aluminum oxide film light filter can carry out selective filtering to the light with the wave band of 500nm to1500nm.age. The porous aluminum oxide film light filter can carry out selective filtering to the light with the wave band of 500nm to1500nm.h are linear through-holes with the aperture of 40-60nm; the hole wall thereof is provided with more than two layers of branching holes, the aperture of each of which is 20 nm to 40nm, and the anglesh are linear through-holes with the aperture of 40-60nm; the hole wall thereof is provided with more than two layers of branching holes, the aperture of each of which is 20 nm to 40nm, and the anglesbetween the branching holes and the linear through-holes are 50 degrees to 70 degrees; a trunk layer consisting of the linear through-holes among the branching holes and a branching layer consisting obetween the branching holes and the linear through-holes are 50 degrees to 70 degrees; a trunk layer consisting of the linear through-holes among the branching holes and a branching layer consisting of the branching holes change periodically; and the thickness of the film is 60 Mum to 180 Mum. The light filter is used for filtering light with the wave band of 500nm to 1500nm. The method comprisesf the branching holes change periodically; and the thickness of the film is 60 Mum to 180 Mum. The light filter is used for filtering light with the wave band of 500nm to 1500nm. The method comprisesthe following steps of placing an aluminum sheet in acid solution with the concentration of 0.2M to 0.4M and carrying out anodic oxidation for at least 5 minutes under the curved tooth wave voltage, wthe following steps of placing an aluminum sheet in acid solution with the concentration of 0.2M to 0.4M and carrying out anodic oxidation for at least 5 minutes under the curved tooth wave voltage, where

Description

technical field [0001] The invention relates to a thin-film optical filter and a preparation method thereof, in particular to a porous aluminum oxide thin-film optical filter with bifurcated holes and a preparation method thereof. Background technique [0002] The short-wave infrared rays with a wavelength of 0.8-1.2 μm can pass through the cornea of ​​the human eye and enter the eyeball. The absorption of infrared rays in this wavelength band by the human eye will lead to cataracts. This kind of cataract is called "infrared cataract". Workers in the smelting industry. The main feature of the high-temperature working environment of iron and steel metallurgical enterprises is strong heat radiation and high temperature, especially iron and steel smelting, red steel hot rolling and medium-sized sintering machines are typical infrared heat radiation contact operations. Therefore, it is very necessary to prepare goggles with light filtering effect to protect the health of worker...

AI Technical Summary

Problems solved by technology

But there are deficiencies in this film and its synthesis method. First, the structure of pores in the film is not periodic in the direction perpendicular to the membrane surface, making it only suitable for filtering particles or bacteria, not It has the function of filtering; secondly, in the process of reducing the pressure twice, it needs to be oxidized with different acid solutions, which makes the process complicated and difficult to improve the efficiency

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