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CN-117984632-B - Design method of temperature-adaptive infrared/radar compatible stealth surface structure

CN117984632BCN 117984632 BCN117984632 BCN 117984632BCN-117984632-B

Abstract

A design method of a temperature self-adaptive infrared/radar compatible stealth surface structure relates to the field of aerospace infrared and radar stealth. The temperature-adaptive infrared/radar compatible stealth surface structure is a layered structure and comprises a radar wave absorbing layer, a heat insulating layer and a temperature-adaptive infrared emitting layer. The radar wave absorbing layer absorbs waves by more than 10dB in a 4-12 GHz frequency band, so that radar stealth can be realized. The heat insulating layer adopts a micro-nano heat insulating film to isolate the internal heat source of the target. The temperature self-adaptive infrared emission layer can change the emissivity range to be 0.23-0.88 in the wave band of an atmospheric window (8-12 mu m), so that the thermal management and infrared stealth of the target are realized. The design avoids the bottleneck problem that radar characteristic regulation and control and infrared characteristic regulation and control are mutually restricted through the multilayer micro-nano structure innovative design and the excellent electromagnetic regulation and control performance of the graphene composite material, and achieves the maximum efficiency of radar infrared comprehensive characteristic regulation and control.

Inventors

  • WANG RUZHI
  • WANG HAN
  • WANG CHAO
  • AN ZELIN
  • LI XIUFENG
  • LIU LIYING

Assignees

  • 北京工业大学

Dates

Publication Date
20260512
Application Date
20240118

Claims (6)

  1. 1. A design method of a temperature self-adaptive infrared/radar compatible stealth surface structure is characterized in that the overall structure is a layered structure, each layer of top view is square, and the design method sequentially comprises the following functional areas from top to bottom: The infrared control function area is formed by spraying graphene, zinc sulfide ZnS and vanadium dioxide VO 2 materials from bottom to top through a magnetron sputtering method, wherein the thicknesses of the graphene, the ZnS and the VO 2 materials are respectively 0.2-2 mu m, 0.25-3 mu m and 0.01-0.2 mu m; the heat insulation area is formed by coating polyurethane acrylate PUA materials on the surface of a polyester substrate, the heat conductivity of the heat insulation area is 0.008-0.03W/m.K, and the thickness of the heat insulation area is 0.5-5 mm; The radar wave-absorbing functional area consists of two parts, namely a periodic layered material and a metal grounding layer, wherein the periodic layered material has a period number of 5, and each periodic unit comprises a resistor film layer, a thermoplastic polyester layer and an insulating layer from top to bottom.
  2. 2. The method of claim 1, wherein the resistive film has a sheet resistance in each cycle of 500 to 800 Ω/∈s in the 1 st cycle of the uppermost layer, and the sheet resistance of the resistive film in the 2 nd, 3 rd, 4 th, and 5 th cycles from top to bottom is sequentially reduced by 50 to 100 Ω/∈s than in the last cycle, and the range of the side length of the resistive film in all cycles is 190 to 310mm, and the range of the thickness is 1 to 3mm.
  3. 3. The method of claim 1, wherein the thermoplastic polyester layer is polyethylene terephthalate (PET) and has a thickness ranging from 0.1 to 0.5mm in each cycle.
  4. 4. The method of claim 1, wherein the insulating layer is made of a polymethacrylimide foam PMI with a thickness of 4.5-6.5 mm in the 1 st and 3 rd cycles from top to bottom and a thickness of 1.5-3.5 mm in the 2 nd, 4 th and 5 th cycles.
  5. 5. The method of claim 1, wherein the metal ground layer is made of copper or silver and has a thickness of 0.01-0.5 mm.
  6. 6. The method of claim 1, wherein the other layers except the resistive layer have the same side length and the side length ranges from 320 mm to 400mm.

Description

Design method of temperature-adaptive infrared/radar compatible stealth surface structure Technical Field The invention relates to the field of aerospace infrared and radar stealth, in particular to a temperature-adaptive infrared/radar compatible stealth multilayer surface film structure. Background With the development of high and new technologies and the progress of society, the new generation of space situation awareness system has wide application prospect. The mature application of the current space situation awareness system has realized the integrated radar and infrared combined space situation awareness capability in the global scope, and the integrated radar and infrared combined space situation awareness system has full-time-period and full-frequency-spectrum accurate detection and early warning functions for the fields of civil aviation industry, weather forecast and the like. However, in the current technology for handling emergency events, there are problems of mutual restriction and balance among functions such as detection, privacy protection and defense, and a unified and coordinated solution is required. Therefore, realizing integrated function integration of intelligent detection, privacy protection, defense and the like is an important subject in the future safety field. The security system of each country is more and more important for the acquisition and inverse acquisition of multidimensional information, which plays a vital role in the modern security field. The development and application of the low-detectability technology become necessary, and the target is not easy to be found, identified, tracked, positioned and attacked by other people by reducing the characteristic signal characteristics of the target, so that the aim of protecting the safety of the target is fulfilled. Modern low-detectability technologies include electronic radar, infrared sensing, electromagnetic monitoring, visible stealth, sonar technology, multi-band technology fusion, and the like. The current safety guarantee system mainly faces the threat of radar detection and infrared detection. Although a great deal of research is currently dedicated to achieving the stealth of the target through infrared feature regulation and control, radar feature regulation and radar infrared comprehensive feature regulation and control, many developments and breakthroughs are made, excessive heat is usually generated by the use of radar wave-absorbing materials in the practical application process, and the effect of the infrared feature regulation and control is further affected. Therefore, the challenges of avoiding the mutual restriction of radar characteristic regulation and infrared characteristic regulation in realizing the maximum efficacy of the infrared comprehensive characteristic of the radar still need to be further solved. Disclosure of Invention Aiming at the bottleneck problem that radar characteristics and infrared characteristic regulation are mutually restricted, the patent provides a temperature self-adaptive infrared/radar compatible stealth surface structure, and the surface structure can realize radar stealth and infrared characteristic regulation. The multi-layer film structure is designed and organically combined to realize compatible stealth of multiple spectrum ranges such as target long-wave infrared, radar and the like, and meanwhile, the emissivity of the target can be adaptively regulated and controlled along with the change of the target temperature, and the thermal management of the target is realized by combining the micro-nano structure heat insulation film. The temperature-adaptive infrared/radar compatible stealth surface structure is a layered structure with a square top view, and comprises the following functional areas: infrared regulation and control functional area, namely graphene doped infrared radiation regulation and control film Thermal insulation region micro-nano structure thermal insulation film Radar wave-absorbing function area-radar wave-absorbing multilayer gradual change film Further, the infrared control functional area is of a layered structure, and is formed by compounding an upper layer material, a lower layer material and a lower layer material, wherein the upper layer material, the lower layer material and the lower layer material are sequentially graphene (graphene), zinc sulfide (ZnS) and vanadium dioxide (VO 2) materials. The thickness of each layer was 0.5 μm, 0.75 μm and 0.075 μm, respectively. When the target is at a higher temperature (above the phase transition temperature of VO 2), VO 2 is in a low resistance state (metal). At this time, the thinner VO 2 layer has higher transmittance to the radiation of the infrared band, most of infrared radiation enters the middle lower layer of the film through the VO 2 layer, and the infrared light-transmitting medium ZnS film layer is introduced between the bottom graphene layer and the VO 2 film, so that the Fabry-Perot