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Radiation refrigeration optical filter, method for preparing same and application of radiation refrigeration optical filter

A technology of radiative refrigeration and optical filters, applied in optics, optical components, installation, etc., can solve the problems of high preparation cost, difficult processing, unfavorable large-scale and large-area production, etc., and achieve the effect of low preparation cost and simple structure

Active Publication Date: 2018-10-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the method proposed by the above method, the device structure is complex, the processing is difficult, the preparation cost is high, and complex nano-processing technologies such as electron beam exposure are often required, which is not conducive to large-scale large-area production.

Method used

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  • Radiation refrigeration optical filter, method for preparing same and application of radiation refrigeration optical filter
  • Radiation refrigeration optical filter, method for preparing same and application of radiation refrigeration optical filter
  • Radiation refrigeration optical filter, method for preparing same and application of radiation refrigeration optical filter

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Experimental program
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Effect test

preparation example Construction

[0077] Such as figure 2 Shown, the preparation method of radiation cooling filter comprises the following steps:

[0078] 1) Based on the spectral characteristics of the three colors of red, green and blue, and considering the emissivity requirements of the atmospheric transparent window, the film system that meets the requirements is designed by optimizing the film system design, including the choice of film material and thickness optimization;

[0079] 2) Put the substrate into the ether solution and ultrasonically clean it for 8 minutes to ensure the cleanliness of the substrate surface;

[0080] 3) First, the middle layer and the top layer of the smooth surface of the substrate are sequentially deposited by electron beam evaporation technology, and then a metal reflective layer is plated on the rough surface of the substrate to obtain a radiation cooling filter.

Embodiment 1

[0082] The corresponding substrate material is white glass, the substrate is polished on one side, and the rough surface is coated with a metal reflective layer. The material of the metal reflective layer is silver (>100nm); an intermediate layer is deposited on the smooth surface of the substrate. The layers are stacked alternately, and the top layer of zinc sulfide (98nm) is deposited on the middle layer.

[0083] From the substrate to the top layer, the deposition parameters of the middle layer are as follows:

[0084]

[0085]

[0086] The visible light spectrum of the obtained radiation cooling filter is as follows: image 3 As shown in (a), the average reflectance in the 630-680nm band is 98.8%, and the average reflectance in the 420-580nm band is 7.6%, which is a red filter.

[0087] At normal incidence, the average emissivity of the filter's atmospheric transparent window is given by Figure 4 shown.

[0088] The filter is insensitive to the angle of radiation...

Embodiment 2

[0090] The corresponding substrate material is white glass, the substrate is polished on one side, and the rough surface is coated with a metal reflective layer. The material of the metal reflective layer is silver (>100nm); an intermediate layer is deposited on the smooth surface of the substrate. The layers are stacked alternately, and the top layer of zinc sulfide (170nm) is deposited on the middle layer.

[0091] From the substrate to the top layer, the deposition parameters of the middle layer are as follows:

[0092] film layer

Material

Thickness / nm

1

TiO 2

104

2

SiO 2

168

3

TiO 2

112

4

SiO 2

148

5

TiO 2

130

6

SiO 2

124

7

TiO 2

143

8

SiO 2

104

9

TiO 2

163

10

SiO 2

62

[0093] The visible light spectrum of the obtained radiation cooling filter is as follows: image 3 As shown in (b), the average reflec...

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Abstract

The invention discloses a radiation refrigeration optical filter which comprises a substrate. A single surface of the substrate is polished, a metal reflecting layer is arranged on a rough surface ofthe substrate, and an intermediate layer and a top layer are sequentially arranged on the polished surface of the substrate; the intermediate layer comprises layers A and layers B which are alternately arranged; the thicknesses of each layer A and each layer B are 50-400 nm; the layers A are made of silicon dioxide or aluminum oxide, and the layers B are made of titanium dioxide or silicon nitrideor silicon carbide; alternatively, the layers A are made of titanium dioxide or aluminum oxide, and the layers B are made of silicon dioxide or silicon nitride or silicon carbide; the top layer is made of ytterbium fluoride or yttrium fluoride or zinc sulfide; multi-resonant absorption enhancers in wavebands of atmospheric transparent windows (with the wavebands of 8-13 micrometers) are jointly formed by the intermediate layer and the top layer. Compared with the traditional optical filters, the radiation refrigeration optical filter has the advantages that the radiation refrigeration opticalfilter can work in intense light for a long time, and radiation refrigeration can be passively implemented by the radiation refrigeration optical filter.

Description

technical field [0001] The invention relates to the field of environmental protection, energy-saving refrigeration and decoration, in particular to a radiation refrigeration filter and its preparation method and application. Background technique [0002] Color filter is a common optical device that selectively reflects or transmits specific wavelengths in the visible light band to present different colors. and imaging and other fields have a wide range of applications. [0003] Optical filters can be divided into reflective filters and transmissive filters. A reflective filter means that the filter can reflect light of a specific wavelength to display a specific color. When the incident light source is white light (such as sunlight), the reflective filter displays a specific color by reflecting light of a specific band, and the light of the remaining bands can be transmitted to the space on the back surface of the filter, which is a more common practice On the back of the ...

Claims

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Application Information

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IPC IPC(8): G02B5/28
CPCG02B5/285G02B5/26G02B5/22G02B7/008
Inventor 沈伟东袁华新杨陈楹郑晓雯沐雯王震袁文佳章岳光
Owner ZHEJIANG UNIV
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