US-20260126273-A1 - TEMPERATURE-SENSITIVE INFRARED RADIATION ACTIVE CONTROL SHEET

US20260126273A1US 20260126273 A1US20260126273 A1US 20260126273A1US-20260126273-A1

Abstract

An embodiment relates to a technology capable of implementing a camouflage effect in the visible light range and also in the infrared range due to temperature rise, while controlling the camouflage effect. A temperature-sensitive infrared radiation active control sheet according to the embodiment includes: blocks formed of vanadium oxide; and a substrate formed under the blocks.

Inventors

Hyung Hee CHO
Joon Soo LIM
Nam Kyu Lee
In Joong CHANG
Ju Yeong NAM
Jin Sup SONG
Jae Hyeong Kim

Assignees

INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY

Dates

Publication Date: 20260507
Application Date: 20251104
Priority Date: 20241104

Claims (12)

1 . A temperature-sensitive infrared radiation active control sheet, comprising: a plurality of blocks formed of vanadium oxide; and a substrate disposed under the plurality of blocks, wherein at least one pair of blocks among the plurality of blocks has different thicknesses from each other.
2 . The temperature-sensitive infrared radiation active control sheet of claim 1 , wherein the plurality of blocks are configured to define a camouflage pattern.
3 . The temperature-sensitive infrared radiation active control sheet of claim 1 , wherein at least one pair of blocks among the plurality of blocks have a same thickness.
4 . The temperature-sensitive infrared radiation active control sheet of claim 1 , wherein a thickness of each of the plurality of blocks is in a range of 50 to 400 nanometers (nm).
5 . The temperature-sensitive infrared radiation active control sheet of claim 1 , wherein when a temperature of the plurality of blocks is equal to or higher than a transition temperature, infrared radiation signals of at least one pair of blocks among the plurality of blocks are different from each other.
6 . The temperature-sensitive infrared radiation active control sheet of claim 1 , wherein when a temperature of the plurality of blocks is lower than a transition temperature, colors of at least one pair of blocks among the plurality of blocks are different from each other.
7 . The temperature-sensitive infrared radiation active control sheet of claim 1 , wherein depending on a temperature of the plurality of blocks, a camouflage pattern in a visible area and a camouflage pattern in an infrared area are switched and expressed.
8 . The temperature-sensitive infrared radiation active control sheet of claim 1 , wherein the substrate is formed of quartz, aluminum oxide (Al 2 O 3 ) or silicon dioxide (SiO 2 ).
9 . The temperature-sensitive infrared radiation active control sheet of claim 1 , further comprising a base plate disposed under the substrate.
10 . The temperature-sensitive infrared radiation active control sheet of claim 9 , wherein the base plate is formed of a flexible material.
11 . The temperature-sensitive infrared radiation active control sheet of claim 9 , wherein a combination of one substrate and one block is formed, and a plurality of combinations are disposed on the base plate.
12 . The temperature-sensitive infrared radiation active control sheet of claim 1 , wherein a surface shape of the plurality of blocks includes a polygon, circle or ellipse.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application claims priority from Korean Patent Application No. 10-2024-0154081, filed on Nov. 4, 2024, and Korean Patent Application No. 10-2025-0150165, filed on Oct. 17, 2025, in the Korean Intellectual Property Office, which is incorporated herein by reference in its entirety. BACKGROUND The disclosure relates to a temperature-sensitive infrared radiation active control sheet, and more particularly, to a technology capable of implementing a camouflage effect in the visible light region and simultaneously implementing a camouflage effect in the infrared region due to a temperature increase, and performing control over the camouflage effect. An infrared camouflage technology is a crucial technology for enhancing survivability and operational success by reducing the detectability of friendly military operational systems to enemy detection systems. Infrared detection primarily operates in the infrared band (8-12 μm) at low temperatures and in the mid-infrared band (3-5 μm) at high temperatures, and active research is being conducted to reduce infrared radiation signals within the detection band to implement infrared camouflage technology. Recent advancements in infrared detection sensors and AI-based analysis technologies are now capable of analyzing and identifying infrared signals in image form, rendering existing infrared camouflage techniques ineffective. Therefore, to overcome the limitations of uniform camouflage techniques, proactively creating infrared camouflage patterns is necessary. However, simultaneously implementing camouflage patterns in the visible range is challenging. In Korean Patent No. 10-2018-0105109 (Title of invention: CAMOUFLAGE DEVICE), a camouflage device is disclosed that includes a paint layer applied to the camouflage device so that the camouflage color changes to a required color depending on moisture or temperature depending on the operating conditions of the camouflage device. RELATED ART DOCUMENTS Patent Document Republic of Korea Patent No. 10-2018-0105109 SUMMARY An aspect of the disclosure is to provide a technology that can achieve a camouflage effect in the visible light range and also in the infrared range due to temperature increase, and can control the camouflage effect. The aspect of the disclosure is not limited to that mentioned above, and other aspects not mentioned will be clearly understood by those skilled in the art from the description below. To this end, the disclosure includes: blocks formed of vanadium oxide; and a substrate formed under the blocks, wherein one of the plurality of blocks has different thicknesses from another block. In an embodiment of the disclosure, the plurality of blocks may form a camouflage pattern. In an embodiment of the disclosure, one block and another block among the plurality of blocks may have the same thickness. In an embodiment of the disclosure, the thickness of the blocks may be 50 to 400 nanometers (nm). In an embodiment of the disclosure, when the temperature of the plurality of blocks is equal to or higher than the transition temperature, infrared radiation signals of one block and another block among the plurality of blocks may be different from each other. In an embodiment of the disclosure, when the temperature of the plurality of blocks is lower than the transition temperature, colors of one block and another blocks among the plurality of blocks may be different from each other. In an embodiment of the disclosure, depending on the temperature of the blocks, a camouflage pattern in a visible area and a camouflage pattern in an infrared area may be switched and expressed. In an embodiment of the disclosure, the disclosure may further include a base plate formed under the substrate. In an embodiment of the disclosure, the substrate may be formed of quartz, aluminum oxide (Al2O3) or silicon dioxide (SiO2). In an embodiment of the disclosure, the base plate may be formed of a flexible material. In an embodiment of the disclosure, a combination of one substrate and one block may be formed, and a plurality of combinations may be arranged on the base plate. In an embodiment of the disclosure, the surface shape of the blocks may be formed in a polygon, circle or ellipse. The effect of the disclosure is that the infrared pattern can be changed in real time based on temperature, while simultaneously a camouflage pattern can be implemented in the visible range with color change characteristics based on thickness, so that it is possible to significantly enhance the camouflage effect in each optical region. Furthermore, the effect of the disclosure is that the camouflage pattern can be actively changed during operation in the infrared range, and thus it is possible to avoid detection of infrared signals and shape analysis by the developed Image IR technology. The effects of the disclosure are not limited to the effects described above, and should be understood to include all effects t