Reconfigurable all-thermal super surface capable of presenting infrared thermal phantom and being invisible under visible light

Abstract

The invention belongs to the technical field of thermodynamics, and particularly relates to a reconfigurable all-thermal super surface capable of presenting infrared thermal phantom and being invisible under visible light. The all-thermal super surface is formed by periodically extending structural units in the same plane, wherein a heat source is positioned at the bottom of the super surface structure, heat flow is transmitted in the direction perpendicular to the plane, heat is transmitted in the structure in a heat conduction mode, the structural surface is transmitted to the surrounding environment in a heat convection and heat radiation mode, heat insulation is considered between the units and the side face of the whole super surface, and the functions of hiding under visible light and presenting the thermal phantom under infrared light are achieved for an object; the structural unit is a rectangular cylinder, and a cylindrical open cavity is formed in the center of the structuralunit; and a specific phantom is displayed under infrared light by utilizing the heat radiation cavity effect. The method is suitable for steady-state or transient conditions and is suitable for the condition that the background temperature is uniform or changed. Different from a previous mechanism for realizing infrared thermal phantom, the application range is greatly expanded.

Description

Technical field [0001] The invention belongs to the technical field of metasurfaces, and specifically relates to a reconfigurable total thermal metasurface that presents infrared thermal phantoms and is invisible under visible light, that is, the realized reconfigurable total thermal metasurface presents a specific appearance in an infrared field of view Temperature distribution, and the difference between the object and the background cannot be distinguished under visible light. Background technique [0002] All objects with a temperature higher than absolute zero emit electromagnetic waves. This macroscopic radiation phenomenon that is manifested by the thermal motion of microscopic particles is called thermal radiation. According to Wien’s law, in a wide temperature range (10 0 ~10 3 ℃), the spectral peak of thermal radiation is in the infrared wavelength range, so thermal radiation is again called infrared radiation. Using the infrared radiation characteristics of the object...

AI Technical Summary

Problems solved by technology

However, all these emissivity control methods require additional external field for control, which makes the design of the device more complicated and cumbersome

Although there are a lot of related researches on these two types of control methods, the current problem is how to achieve flexible and reliable infrared phantom under the condition of complex environment and coexistence of multiple heat transfer methods.

[0003] In order to solve these problems at the same time, the present invention proposes a reconfigurable all-thermal metasurface that presents infrared thermal phantom and is invisible under visible light. Invisible light cannot tell the difference between the figure and the background

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