Dynamic thermal camouflage system suitable for complex uncontrolled environment

Abstract

The invention discloses a dynamic thermal camouflage system suitable for a complex uncontrolled environment, and belongs to the technical field of dynamic thermal camouflage. In order to solve the problem of controlling a dynamic target temperature field in real time in a complex uncontrolled environment and realize dynamic thermal camouflage under complex and changeable uncontrolled meteorological conditions, the invention provides a dynamic thermal camouflage system suitable for the complex uncontrolled environment. According to the thin film, the surface temperature of the thin film is automatically regulated and controlled through the liquid temperature changing technology and fluid control, the heat radiation energy of equipment and personnel is changed, and the cross-regional self-adaptive thermal invisibility or falsification effect in the dynamic environment is achieved. Comprising a film, a thermal camouflage response system and a thermal infrared characteristic analysis system, the thermal camouflage film is applied to stealth or faking in a thermal infrared band under the influence of solar radiation, wind, rain and fog on a surface temperature field of a camouflage object, and the thermal camouflage film capable of accurately regulating and controlling thermal radiation energy of the camouflage object in real time in a complex uncontrolled environment can be formed. And the dynamic camouflage performance is comprehensively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of dynamic thermal camouflage, and in particular relates to a dynamic thermal camouflage system suitable for use in complex uncontrolled environments. Background Art

[0002] Dynamic thermal camouflage technology combines a variety of technical means such as metamaterials, image processing and dynamic control to dynamically adjust the infrared radiation energy of camouflaged objects to adapt to changes in environmental conditions, ensuring that the camouflaged objects always maintain consistent or similar infrared radiation characteristics with the background, and are not detected. Variable temperature camouflage technology can not only hide the thermal characteristics of camouflaged objects through dynamic temperature changes, but also distort the thermal characteristics of camouflaged objects to achieve infrared false detection effects. At present, the most studied temperature change technologies include phase change thermal control, electrothermal change and liquid temperature change. However, in the face of complex and changeable uncontrolled meteorological conditions, such as wind, rain, fog and sunlight, phase change thermal control and electrothermal change technologies have dynamic camouflage limitations such as poor controllability of dynamic temperature control, insufficient sensitivity and small temperature control range under the rapid changes of cross-regional, multi-season and all-weather background environments. Liquid temperature variable technology and fluid control have the characteristics of sensitive temperature response, strong controllability and high energy efficiency. The liquid has a wide adjustable temperature range and fast heat transfer speed. By changing the temperature, flow direction and flow rate of the liquid, it can achieve rapid temperature change of camouflaged objects and adapt to various temperature distributions of the background to meet the development needs of new dynamic thermal camouflage technology.

[0003] The particularity of complex uncontrolled environments directly affects the heat and mass transfer process on the surface of camouflaged objects, making the thermal infrared characteristics of camouflaged objects show more complex dynamic changes in complex environments such as rain, fog, and direct sunlight. In order to find a solution to the problem of real-time control of the dynamic target temperature field in a complex uncontrolled environment, there is a lack of a thermal infrared characteristic analysis and response system suitable for complex meteorological, multi-factor interactive, and nonlinear environments. The accurate prediction and real-time response of the temperature field on the surface of the thermal camouflage flexible membrane is the key to accurately control the infrared radiation energy of camouflaged objects. Summary of the invention

[0004] In order to solve the problem of real-time control of the dynamic target temperature field in a complex uncontrolled environment and realize dynamic thermal camouflage under complex and changeable uncontrolled meteorological conditions, the present invention provides a dynamic thermal camouflage system suitable for complex uncontrolled environments. The film uses liquid temperature change technology and fluid control to automatically control the surface temperature of the film, change the thermal radiation energy of equipment and personnel, and realize cross-regional adaptive thermal stealth or false display effects in a dynamic environment.

[0005] The technical solution adopted by the present invention is:

[0006] A dynamic thermal camouflage system suitable for complex uncontrolled environments, including

[0007] The film, which covers the camouflaged object, has a liquid temperature-variable layer, and uses liquid temperature-variable technology and fluid control to automatically adjust the temperature of the liquid inside it, thereby controlling the surface temperature of the film;

[0008] The thermal camouflage response system is connected to the film through a fluid conduit and is used to control the temperature and flow direction of the fluid in the film so that the camouflaged object attached to the film can achieve a gradient temperature distribution in the infrared spectrum;

[0009] The thermal infrared characteristic analysis system obtains a multi-physics coupling solver through multi-physics coupling modeling of camouflage films in complex uncontrolled environments, and controls the thermal camouflage response system through signals.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The present invention is used to perform stealth or false display in the thermal infrared band under the influence of solar radiation, wind, rain and fog on the surface temperature field of the camouflaged object. It can form a thermal camouflage film that can accurately control the thermal radiation energy of the camouflaged object in real time under a complex uncontrolled environment, thereby comprehensively improving the dynamic camouflage performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention;

[0013] Figure 2 It is the principle diagram of the thermal infrared characteristic analysis system and thermal camouflage response system of the present invention;

[0014] Figure 3 It is the principle diagram of the film structure of the present invention;

[0015] Figure 4 This is a temperature response effect diagram of the film under a dynamic infrared background of the present invention;

[0016] Wherein: 1. film; 2. thermal infrared characteristic analysis system; 3. thermal camouflage response system; 101. aerogel insulation layer; 102. liquid temperature variable layer; 103. PET anti-volatile layer; 104. ITO low emissivity deposition layer; 201. computer; 202. infrared camera; 203. photovoltaic weather station; 301. temperature sensor; 302. heating device; 303. liquid storage box A; 304. refrigeration device; 305. water pump B; 306. liquid storage box B; 307. overflow valve; 308. water pump A; 309. one-way valve; 310. electromagnetic switch valve; 311. flow sensor; 312. proportional valve; 313. controller. DETAILED DESCRIPTION

[0017] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0018] like Figure 1 As shown, the present invention provides a dynamic thermal camouflage system suitable for use in complex uncontrolled environments, comprising: a film 1, covering the camouflaged object, having a liquid temperature-changing layer 102, and automatically regulating the temperature of the liquid inside thereof by liquid temperature-changing technology and fluid control, thereby controlling the surface temperature of the film 1;

[0019] The thermal camouflage response system 3 is connected to the film 1 through a fluid conduit and is used to control the temperature and flow direction of the fluid in the film 1 so that the camouflaged object attached to the film 1 can achieve a gradient temperature distribution in the infrared spectrum;

[0020] The thermal infrared characteristic analysis system 2 obtains the multi-physics coupling solver through multi-physics coupling modeling of camouflage films in complex uncontrolled environments, and controls the thermal camouflage response system 3 through signals.

[0021] In order to develop a multifunctional composite membrane with thermal insulation, temperature control, anti-volatility and low emissivity, the researchers conducted extensive exploration of materials and structural design. Traditional thermal insulation materials usually cannot simultaneously possess multiple functions such as temperature control, anti-volatility and low emissivity, which limits their effectiveness in high-demand applications. For this reason, aerogels have been widely used due to their excellent thermal insulation properties, and liquid variable temperature materials can adjust thermal properties according to changes in ambient temperature to achieve active temperature control.

[0022] In the field of thermal camouflage flexible films, silicone rubber has become an ideal substrate due to its biocompatibility, high optical transparency and excellent tensile properties. However, silicone rubber materials generally have the disadvantage of high water vapor permeability, which causes the liquid in the film to evaporate outward when the contact area between the film and the air is large, thereby affecting the continuity of the liquid circulation in the film. To solve this problem, PET (polyethylene terephthalate) film is selected to prevent liquid evaporation and ensure the long-term stability of the film due to its excellent anti-evaporation properties. At the same time, the ITO (indium tin oxide) layer has low emissivity characteristics. After the surface of the target object is coated with the ITO layer, its infrared radiation is significantly reduced, reducing the possibility of being detected. Especially in thermal camouflage applications, the ITO layer can make the thermal signal of the camouflaged object close to the background environment, making it difficult to be distinguished by the detector, thereby achieving a stealth effect. The ITO layer can be combined with other materials (such as PET, silicone rubber, etc.) to form a composite film. By combining these functional layers, an integrated composite film structure is formed, which enables the material to exhibit excellent comprehensive performance in thermal camouflage applications.

[0023] like Figure 3As shown, the film 1 of the present invention is a composite film with heat insulation performance, temperature control, anti-volatility performance and low emissivity. The structure of the film 1 from bottom to top is respectively an aerogel insulation layer 101, a liquid temperature variable layer 102, a PET anti-volatility layer 103, and an ITO low emissivity deposition layer 104. The PET anti-volatility layer 103 and the ITO low emissivity deposition layer 104 are composited on the Ecoflex surface to form a PET-ITO / Ecoflex composite layer. The aerogel insulation layer 101 and the liquid temperature variable layer 102 are sealed by an Ecoflex base film, and the lower surface of the aerogel insulation layer 101 is sealed by an Ecoflex base film.

[0024] The structure of the aerogel insulation layer 101 of the film 1 is as follows: a plurality of downwardly sunken grooves are provided on the surface of the Ecoflex film, and the grooves are filled with aerogel particles. The cross section of each groove is circular, which effectively prevents the aerogel from falling off.

[0025] The liquid temperature-changing layer 102 of the film 1 automatically regulates the temperature of the liquid inside it by using liquid temperature-changing technology and fluid control, thereby controlling the surface temperature of the film 1;

[0026] The structure of the liquid temperature-changing layer 102 is as follows: a serpentine-shaped downwardly concave flow channel is provided on the surface of the Ecoflex membrane.

[0027] The method for making the film 1 is as follows:

[0028] S1. Forming an aerogel insulation layer 101;

[0029] The surface of the Ecoflex film is provided with topologically distributed grooves, and aerogel particles are filled in the grooves; the aerogel can be evenly filled in the topologically distributed groove structure, effectively preventing the aerogel from falling off, and forming an aerogel insulation layer 101 of the film 1. The filling of the aerogel improves the heat transfer mechanism of the insulation interlayer, so that the insulation interlayer has a lower thermal conductivity.

[0030] S2. Forming a liquid temperature variable layer 102;

[0031] A serpentine-shaped downwardly concave flow channel is opened on the surface of the Ecoflex film. The EcoflexTM FAST prepolymer is scraped onto another pre-treated Ecoflex base film using a coating rod with a gap of 100 μm. The scraping speed is 10 mm / s. The film 1 with the serpentine-shaped downwardly concave flow channel is vertically and gently placed on the Ecoflex base film with the prepolymer, and placed in a constant temperature box at 75° C. for 5 minutes. After curing, a liquid temperature variable layer 102 of the film 1 is formed.

[0032] S3. The liquid temperature-changing layer 102 and the aerogel insulation layer 101 of the sealing film 1;

[0033] In order to seal the liquid temperature-variable layer 102 and the aerogel insulation layer 101 of the film 1, the coating method on both sides of the film 1 is the same, and the EcoflexTM FAST prepolymer is scraped on the other side of the Ecoflex base film with the liquid temperature-variable layer 102 using a coating rod with a gap of 100μm, and the scraping speed is 10mm / s. After the prepolymer on the Ecoflex base film presents a non-flowing semi-solid state, the Ecoflex base film with the prepolymer is vertically and gently placed on the interlayer with aerogel particles, and placed in a constant temperature box at 75℃ for 5min. After curing, the sealed liquid temperature-variable layer 102 and the aerogel insulation layer 101 of the film 1 are formed.

[0034] As a silicone rubber material, Ecoflex film generally has the disadvantage of high water vapor permeability, which causes the liquid in the film to evaporate outward when the contact area between the film 1 and the air is large, thereby affecting the continuity of the liquid circulation in the film. To solve this problem, PET (polyethylene terephthalate) film 1 is selected to prevent liquid evaporation and ensure the long-term stability of the film due to its excellent anti-evaporation performance. At the same time, the ITO (indium tin oxide) layer has low emissivity characteristics. After the surface of the target object is coated with the ITO layer, its infrared radiation is significantly reduced, reducing the possibility of being detected. Especially in thermal camouflage applications, the ITO layer can make the thermal signal of the camouflaged object close to the background environment, making it difficult to be distinguished by the detector, thereby achieving a stealth effect. The ITO layer can be combined with other materials (such as PET, silicone rubber, etc.) to form a composite film. By combining these functional layers, an integrated composite film structure is formed, so that the material can show excellent comprehensive performance in thermal camouflage applications.

[0035] S4. forming a PET-ITO / Ecoflex composite layer;

[0036] Magnetron sputtering is usually used to deposit ITO on a PET substrate. First, the PET substrate is cleaned and dried, and then deposited in a vacuum chamber. By introducing argon gas (sometimes with a small amount of oxygen), a plasma is formed between the target and the substrate. The argon ions collide with the ITO target, sputtering the ITO atoms or molecules onto the PET substrate. During this process, the substrate temperature needs to be kept low to prevent PET from deforming. After the deposition is completed, annealing can be performed to improve the crystal structure and electrical properties of the ITO film 1, forming a PET anti-volatile layer 103 and an ITO low-emissivity deposition layer 104, and then the above-mentioned coating method is used to compound PET and ITO on the Ecoflex surface having a liquid temperature-variable layer 102 of the film 1 and an aerogel insulation layer 101 to form a PET-ITO / Ecoflex composite layer.

[0037] like Figure 1As shown, the thermal infrared characteristic analysis system 2 includes a computer 201, an infrared camera 202 for transmitting information with the computer 201, an image acquisition module, an image processing module, a programmable logic controller, a temperature sensor, a photovoltaic weather station 203, a weather station software platform, a signal generator, and a temperature adaptive compensation module.

[0038] The thermal infrared characteristic analysis system 2 obtains a multi-physics coupling solver by modeling the multi-physics coupling of the camouflage film 1 in a complex uncontrolled environment, modularizes the thermal boundary conditions of the complex environment, provides a visual interactive operation interface, realizes the surface temperature calculation function of the thermal camouflage film 1 under different conditions, generates the surface temperature of the film 1 under different conditions; generates temperature compensation for the liquid temperature and the set temperature of the film 1 area; generates a temperature change signal and a fluid control signal;

[0039] The multi-physics coupling solver modularizes the thermal boundary conditions of complex environments, provides a visual interactive operation interface, realizes the surface temperature calculation function of the thermal camouflage film 1 under different conditions, generates the surface temperature of the film 1 under different conditions; generates temperature compensation for the liquid temperature and the set temperature of the film 1 area; generates temperature change signals and fluid control signals;

[0040] The multi-physics coupling solver consists of an environmental material parameter input module, a thermal boundary condition calculation model module, and a multi-physics coupling solving module; among which:

[0041] The input parameters of the environmental material parameter input module include environmental parameters, meteorological conditions, geographical location, start and end time, material properties and simulation configuration. The simulation configuration includes grid division parameters, time step settings, initial and boundary conditions, numerical solution settings, physical field configuration, data output settings, heat source and fluid settings, as well as iteration and precision control, which are used to define and control the process and precision of multi-physical field coupling simulation. The above parameters are obtained by infrared camera 202, image acquisition module, image processing module, programmable logic controller, temperature sensor, photovoltaic weather station 203 and weather station software platform;

[0042] The thermal boundary condition calculation model module includes environmental model, heat conduction model, thermal convection model, thermal radiation model, evaporation and cooling model. Each model in the above thermal boundary condition calculation model module is mainly implemented through multi-physics field simulation software, combining numerical calculation and analytical methods to accurately describe the thermal boundary conditions in complex environments.

[0043] Among them: The environmental model is used to simulate external meteorological conditions (such as temperature, humidity, wind speed and solar radiation intensity) to provide basic data input for the thermal analysis of the entire system. Through this model, the degree of thermal impact of the environment on the system can be obtained, providing dynamic boundary conditions for subsequent calculations of heat conduction, convection, radiation, etc.

[0044] The heat conduction model is used to simulate the heat transfer within and between materials, and calculate the temperature gradient and heat flow distribution;

[0045] The thermal convection model is used to simulate the heat exchange between the solid surface and the fluid (such as air, water, etc.), especially the enhancement of heat transfer in the presence of flowing media. This model is used to evaluate the effects of wind speed, air flow, etc. on the surface temperature of the film, especially the heat transfer efficiency in a high convection environment;

[0046] The thermal radiation model is used to describe the thermal radiation exchange between the surface of an object and the surrounding environment, and calculate the radiation energy absorption and emission of the object. This model is crucial for evaluating the camouflage effect under high or low temperature conditions, especially the influence of solar radiation and spontaneous radiation of the object;

[0047] Evaporation and Cooling Model: This model simulates the effect of evaporation and cooling on the temperature distribution of liquid surfaces, and is used to evaluate the effects of factors such as fog and raindrops on the thermal characteristics of the system. This model accurately describes how evaporative cooling affects the surface temperature of the film, especially for thermal camouflage applications in hot and humid or rainy environments. These models work together to accurately predict the surface temperature of the film in complex uncontrolled environments.

[0048] The multi-physics field coupling solution module includes a boundary parameter setting unit, a solution method unit, a solution control unit, a monitoring parameter unit and an initialization unit.

[0049] Among them: the boundary parameter setting unit is used to define and configure the boundary conditions of multi-physics field problems;

[0050] The solution method unit selects an appropriate numerical solution algorithm to handle the coupling problem;

[0051] The solution control unit is responsible for managing the iteration strategy, convergence criteria and error control of the solution process;

[0052] The monitoring parameter unit monitors the changes of key physical parameters in real time to ensure the accuracy of the solution;

[0053] Initialization units set initial conditions to speed up solution convergence, reduce calculation time, and ensure reasonable multi-physics coupling solutions.

[0054] In the multi-physics coupling modeling process of the camouflage film 1 under a complex uncontrolled environment in the thermal infrared characteristic analysis system 2, a simplified model of the heat and mass transfer process from the heat source to the film 1 is first established to determine the thermal boundary conditions of the camouflage object under the complex uncontrolled environment due to wind, rain, fog and solar radiation; determine the self-heat conduction, external heat source convection heat transfer and thermal radiation, and the interaction factors between the internal fluid and the wall of the film 1; input the complex meteorological boundary conditions into the environmental model, heat conduction model, thermal convection model, thermal radiation model, evaporation and cooling model, and construct a multi-physics coupling model through coupling equations and joint solutions to obtain a multi-physics coupling solver; simulate the external thermal boundary conditions on the surface of the film 1 to predict the temperature response of the film 1 under different meteorological conditions;

[0055] In the present invention, after the temperature change signal is generated by the thermal infrared characteristic analysis system 2, the camouflage film 1 is connected to the thermal camouflage response system 3, and the temperature and flow direction of the fluid in the film 1 are controlled by the refrigeration device 304, the heating device 302, the temperature sensor 301, the flow sensor 311, the water pump A308, the overflow valve 307, the one-way valve 309, the electromagnetic switch valve 310, the proportional valve 312, etc., so that the camouflaged object attached to the film 1 can achieve a gradient temperature distribution in the infrared spectrum.

[0056] like Figure 2 As shown, the method of using the thermal infrared characteristic analysis system 2 is:

[0057] The surface temperature of film 1 is calculated by the multi-physics coupling solver to generate the set temperature value T of film 1. FN and flow setting value q N After; the signal generator generates a temperature control signal based on the set temperature value of the film 1, the controller 313 controls the liquid temperature; the liquid temperature reaches the set value T FN Afterwards, the signal generator generates a flow control signal based on the flow setting value of the film 1, controls the inlet flow, and adjusts the flow so that different areas on the film 1 can achieve temperature response synchronously.

[0058] The surface temperature T' of the film 1 is collected by the infrared camera 202 FN , the collected temperature information is transmitted to the signal generator, if T' FN =T FN , then keep the liquid circulating; if T' FN ≠T FN , then enter the temperature adaptive compensation module; the temperature adaptive compensation module generates the liquid temperature compensation T LN The signal generator generates a temperature signal based on the liquid temperature compensation value, and the controller 313 calculates the output current drive signal according to the collected temperature signal and the liquid temperature output by the liquid storage box A303, and automatically changes the compensation amount;

[0059] The temperature change signal and the fluid control signal are transmitted to the thermal camouflage response system 3, and the temperature and flow direction of the fluid in the film 1 are controlled by the thermal camouflage response system 3. The thermal camouflage response system 3 controls the temperature and flow direction of the fluid in the film 1 by generating the temperature change signal and the fluid control signal, so that the target attached to the film 1 can be invisible in the infrared spectrum;

[0060] like Figure 1 As shown, the thermal camouflage response system 3 includes a temperature sensor 301, a heating device 302, a liquid storage box A303, a refrigeration device 304, a water pump B305, a liquid storage box B306, an overflow valve 307, a water pump A308, a one-way valve 309, an electromagnetic switch valve 310, a flow sensor 311, a proportional valve 312 and a controller 313; the refrigeration device 304 and the heating device 302 are installed on the liquid storage box A303, the temperature sensor 301 is installed in the liquid storage box A303, the inlet end of the water pump A308 is connected to the liquid storage box A303, and the outlet end of the water pump A308 is connected to the flow channel inlet of the liquid temperature variable layer 102 of the film 1 through a pipeline, and the pipe A proportional valve 312, a flow sensor 311, an electromagnetic switch valve 310 and a one-way valve 309 are installed on the channel; an overflow pipe is connected between the liquid storage box A303 and the pipeline, and an overflow valve 307 is installed on the overflow pipe; a liquid storage box B306 is installed between the flow channel outlet of the liquid temperature-changing layer 102 of the film 1 and the inlet end of the water pump B305, and the outlet end of the water pump B305 is connected to the liquid storage box A303; the refrigeration device 304, the heating device 302, the temperature sensor 301, the proportional valve 312, the flow sensor 311, the electromagnetic switch valve 310, the one-way valve 309, the overflow valve 307, the water pump A308 and the water pump B305 are all controlled by the controller 313.

[0061] The thermal camouflage response system 3 includes two closed-loop feedback control loops, one for liquid temperature control and the other for flow control. Each component of the refrigeration device 304 is driven by a programmable power supply. The functions of liquid temperature control and flow control in the thermal camouflage response system 3 are realized through the control system of the controller 313. The temperature setting value T is obtained by the single-chip microcomputer of the controller 313. N, the liquid temperature data is collected to the single chip microcomputer through the analog-to-digital conversion module A / D. The single chip microcomputer receives the set temperature given by the algorithm, and detects the liquid temperature in the liquid storage box A303 through the temperature sensor 301 in the liquid storage box A303. According to the difference between the temperature in the liquid storage box A303 and the temperature of the camouflaged object, a temperature control signal is output to adjust the power of the heating device 302 and the refrigeration device 304. When the liquid temperature reaches the set value, a switch control signal is sent to control the water pump A308 to turn on. The actual temperature data measured by the current film 1 of the measurement system of the controller 313 controls the temperature response of different temperature areas of the film 1, and achieves the effect of adaptive gradient temperature distribution. As the thermal boundary conditions change, the film 1 responds to temperature, so that the temperature of the surface of the camouflaged object is consistent with the temperature gradient distribution of the background, and the camouflaged film 1 is adaptively adjusted.

[0062] When the film 1 covers the target surface of the heat source, the temperature adaptive compensation is used to compensate for the difference between the liquid temperature output by the liquid storage box A303 and the actual temperature of the film 1. By collecting the surface temperature of the film 1, the collected temperature information is transmitted to the main controller module of the controller 313; according to the collected temperature signal, combined with the liquid temperature output by the liquid storage box A303, the temperature compensation amount is calculated by the temperature calculation integrated software of the controller 313, and the main controller 313 module calculates the output current drive signal and automatically changes the compensation amount; the temperature compensation module receives the drive signal output by the main controller 313 module, changes the power of the heating device 302 and the cooling device 304, thereby changing the liquid temperature, and achieving the purpose of temperature adaptive compensation.

[0063] The present invention modularizes the thermal boundary conditions of complex environments based on key parameters such as solar radiation intensity, ambient temperature and wind speed under sunny, rainy and foggy weather conditions, determines its own heat conduction, boundary conditions, convective heat transfer and thermal radiation of external heat sources, and factors of interaction between internal fluid and the wall of film 1, inputs the complex meteorological boundary conditions into the environmental model, heat conduction model, thermal convection model, thermal radiation model, evaporation and cooling model, constructs a multi-physics field coupling model through coupling equations and joint solution, and obtains a multi-physics field coupling solver; selects and calculates the heat transfer location of a complex uncontrolled environment, and calculates and analyzes the influence of meteorological parameters on the thermal infrared characteristics of film 1 under sunny, rainy and foggy weather conditions in combination with the actual situation of the climate conditions throughout the year in the selected area; under summer and winter environmental conditions, analyzes the temperature difference between the surface temperature of film 1 and the camouflaged target, and determines the optimal volume flow rate in each season and the temperature distribution characteristics when the temperature difference is the largest.

[0064] like Figure 4 In the present invention, the infrared characteristic change process of the film 1 attached with a 60°C heat source target in a dynamic infrared background is as follows: Figure 4(a). The thermal infrared characteristic analysis system 2 captures the closed film 1 (left image), turns on the thermal camouflage response system 3, and the infrared characteristics of the film 1 blend into the background (middle image); when moving forward, the infrared camera 202 captures the background images of three temperatures, and obtains the liquid temperature setting value through the thermal infrared characteristic analysis system 2; after temperature control and flow control feedback, the three temperatures of liquid are driven to be pumped into the film 1 to achieve adaptive temperature change during movement (right image). In order to evaluate the temperature change effect of the film 1, the pixel-temperature distribution diagram is introduced to evaluate the effectiveness of the zoned temperature control of the film 1. The infrared image has the characteristics of intuitive visualization, which can well reflect the thermal infrared difference characteristics between the target and the background. According to the gradient characteristics of the infrared image, the more obvious the transition between the target and the background, the more obvious the target. Figure 4 (b) shows the pixel-temperature distribution of the heat source target in the infrared background before and after the thermal camouflage response system 3 is turned on. As can be seen from the figure, there is a large temperature gradient between the background and the heat source target before the temperature response, making the target easy to detect. After the temperature response, the target and the background have a continuous and flat temperature gradient, and there is no significant protrusion on the three-dimensional distribution surface. The infrared image shows that the variable temperature film 1 can generate a gradient temperature distribution similar to the background, integrating the thermal infrared characteristics of the target and the background. When the film 1 does not cover the heat source, the temperature of the background plate is changed, and the infrared characteristics of the film 1 change as shown in the figure. Figure 4 As shown in (c), the thermal infrared characteristic analysis system 2 captures the film 1 in the closed state (left image); the thermal camouflage response system 3 is turned on, and as the temperature of the pumped liquid changes, the infrared characteristics of the front area of ​​the film 1 are re-integrated into the background (middle image); when the temperature of the middle area of ​​the background plate rises, the thermal camouflage response system 3 automatically responds to the temperature and heats the liquid in the corresponding area of ​​the liquid storage box. The liquid heats up and fills into the film 1, making the film 1 and the background more naturally integrated in the infrared spectrum (right image).

[0065] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A dynamic thermal camouflage system suitable for use in complex uncontrolled environments, characterized by: include: The film (1) is covered on the camouflaged object and has a liquid temperature-changing layer (102) which automatically adjusts the temperature of the liquid inside the film (1) by using liquid temperature-changing technology and fluid control, thereby controlling the surface temperature of the film (1); The thermal camouflage response system (3) is connected to the film (1) through a fluid conduit and is used to control the temperature and flow direction of the fluid in the film (1) so that the camouflaged object attached to the film (1) can achieve a gradient temperature distribution in the infrared spectrum; The thermal infrared characteristic analysis system (2) obtains a multi-physics coupling solver through multi-physics coupling modeling of camouflage films in complex uncontrolled environments, and controls the thermal camouflage response system (3) through signals.

2. According to claim 1, a dynamic thermal camouflage system suitable for use in complex uncontrolled environments is characterized by: The film (1) structure comprises, from bottom to top, an aerogel insulation layer (101), a liquid temperature-variable layer (102), a PET anti-volatile layer (103), and an ITO low-emissivity deposition layer (104); the PET anti-volatile layer (103) and the ITO low-emissivity deposition layer (104) are composited on the surface of Ecoflex to form a PET-ITO / Ecoflex composite layer; the aerogel insulation layer (101) and the liquid temperature-variable layer (102) are sealed by an Ecoflex base film; and the lower surface of the aerogel insulation layer (101) is sealed by an Ecoflex base film.

3. According to claim 2, a dynamic thermal camouflage system suitable for use in complex uncontrolled environments is characterized by: The structure of the aerogel heat insulation layer (101) of the film (1) is as follows: a plurality of downwardly sunken grooves are provided on the surface of the Ecoflex film, the grooves are filled with aerogel particles, and the cross section of each groove is circular.

4. According to claim 3, a dynamic thermal camouflage system suitable for use in complex uncontrolled environments is characterized by: The structure of the liquid temperature-changing layer (102) is as follows: a downwardly concave flow channel distributed in a serpentine shape is provided on the surface of the Ecoflex membrane.

5. According to claim 4, a dynamic thermal camouflage system suitable for use in complex uncontrolled environments is characterized by: The method for preparing the film (1) is as follows: S1. Forming an aerogel insulation layer (101); A downwardly concave groove is provided on the surface of the Ecoflex membrane, and aerogel particles are filled in the groove; S2. Forming a liquid temperature variable layer (102); A serpentine-shaped downwardly concave flow channel is opened on the surface of the Ecoflex film, and the EcoflexTM FAST prepolymer is scraped onto another pre-treated Ecoflex base film using a coating rod, and the film (1) with the serpentine-shaped downwardly concave flow channel is vertically and gently placed on the Ecoflex base film with the prepolymer, and placed in a constant temperature box for curing; S3. The liquid temperature-changing layer (102) and the aerogel insulation layer (101) of the sealing film (1); Using a coating rod, the prepolymer of EcoflexTM FAST is scraped onto the other side of the Ecoflex base film with the liquid temperature-variable layer (102), and the Ecoflex base film with the prepolymer is vertically and gently placed on the interlayer with the aerogel particles, and placed in a constant temperature box for curing; S4. forming a PET-ITO / Ecoflex composite layer; First, the PET substrate is cleaned and dried, and then deposited in a vacuum chamber. By introducing argon gas, plasma is formed between the target material and the substrate. Argon ions collide with the ITO target material, and ITO atoms or molecules are sputtered onto the PET substrate. After the deposition is completed, annealing is performed to form a PET anti-volatile layer (103) and an ITO low-emissivity deposition layer (104). Then, the PET and ITO are composited on the Ecoflex surface having a thin film (1), a liquid temperature-variable layer (102) and an aerogel insulation layer (101) using the above coating method to form a PET-ITO / Ecoflex composite layer.

6. According to claim 1, a dynamic thermal camouflage system suitable for use in complex uncontrolled environments is characterized by: The thermal infrared characteristic analysis system (2) comprises a computer (201), an infrared camera (202) for transmitting information to the computer (201), an image acquisition module, an image processing module, a programmable logic controller, a temperature sensor, a photovoltaic weather station (203), a weather station software platform, a signal generator, and a temperature adaptive compensation module.

7. A dynamic thermal camouflage system suitable for use in complex uncontrolled environments according to claim 6, characterized in that: The thermal infrared characteristic analysis system (2) obtains a multi-physical field coupling solver by multi-physical field coupling modeling of the camouflage film (1) under a complex uncontrolled environment. The multi-physics coupling solver consists of an environmental material parameter input module, a thermal boundary condition calculation model module, and a multi-physics coupling solving module; The input parameters of the environmental material parameter input module include environmental parameters, meteorological conditions, geographical location, start and end time, material properties and simulation configuration; The thermal boundary condition calculation model module includes an environment model, a heat conduction model, a heat convection model, a heat radiation model, and an evaporation and cooling model; The multi-physics field coupling solution module includes a boundary parameter setting unit, a solution method unit, a solution control unit, a monitoring parameter unit and an initialization unit.

8. The dynamic thermal camouflage system suitable for use in complex uncontrolled environments according to claim 7, characterized in that: The method for using the thermal infrared characteristic analysis system (2) is as follows: The surface temperature of the film (1) is calculated by a multi-physics coupling solver to generate the set temperature T of each area of ​​the film (1). N After that, the liquid compensation temperature T L , generating a temperature change signal and a fluid control signal, and transmitting the temperature change signal and the fluid control signal to a thermal camouflage response system (3), and the thermal camouflage response system (3) controls the temperature and flow direction of the fluid in the film (1).

9. According to claim 1, a dynamic thermal camouflage system suitable for use in complex uncontrolled environments is characterized by: The thermal camouflage response system (3) comprises a temperature sensor (301), a heating device (302), a liquid storage box A (303), a refrigeration device (304), a water pump B (305), a liquid storage box B (306), an overflow valve (307), a water pump A (308), a one-way valve (309), an electromagnetic switch valve (310), a flow sensor (311), a proportional valve (312) and a controller (313); the liquid storage box A (303) is installed with a refrigeration device (304) and a heating device (302); the liquid storage box A (303) is installed with a temperature sensor (301); the inlet end of the water pump A (308) is connected to the liquid storage box A (303); the outlet end of the water pump A (308) is connected to the flow channel inlet of the liquid temperature variable layer (102) of the film (1) through a pipeline, and the pipeline is A proportional valve (312), a flow sensor (311), an electromagnetic switch valve (310) and a one-way valve (309) are installed; an overflow pipe is connected between the liquid storage box A (303) and the pipeline, and an overflow valve (307) is installed on the overflow pipe; a liquid storage box B (306) is installed between the flow channel outlet of the liquid temperature-changing layer (102) of the film (1) and the inlet end of the water pump B (305); the outlet end of the water pump B (305) is connected to the liquid storage box A (303); the refrigeration device (304), the heating device (302), the temperature sensor (301), the proportional valve (312), the flow sensor (311), the electromagnetic switch valve (310), the one-way valve (309), the overflow valve (307), the water pump A (308) and the water pump B (305) are all controlled by a controller (313).

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