Method for measuring background heat flux based on solar simulator heat balance test

Abstract

This invention provides a method for measuring background heat flux based on a solar simulator thermal balance test, comprising: entering a first operating condition with the heat sink turned on and the solar simulator turned off; acquiring the background heat flux of the heat sink; entering a second operating condition with the heat sink turned on and the solar simulator turned on; acquiring the background heat flux of the heat sink, the background heat flux of the temperature rise at the light outlet, and the background heat flux of the temperature rise at the reflector, and determining the sum of the three; entering a third operating condition with the heat sink turned on, the solar simulator turned off, and the heating plate on the back of the reflector turned on, adjusting the temperature of the reflector to be consistent with the reflector temperature in the second operating condition; acquiring the background heat flux of the heat sink and the background heat flux of the temperature rise at the reflector in the third operating condition, and determining the sum of the two; subtracting the sum of the two from the background heat flux of the heat sink to obtain the background heat flux of the temperature rise at the reflector; and subtracting the sum of the three from the sum of the two to obtain the background heat flux of the temperature rise at the light outlet, thereby improving the efficiency of background heat flux measurement.

Description

Technical Field

[0001] This invention relates to the field of solar simulator thermal balance test technology, and in particular to a method for measuring background heat flux based on solar simulator thermal balance test. Background Technology

[0002] In spacecraft thermal balance tests, accurate simulation of heat flow is required. Using a solar simulator to conduct spacecraft thermal balance tests is the simulation method that most closely approximates the real space environment. Especially for deep-space spacecraft and spacecraft with complex surface conditions, the solar simulator-based thermal testing method is simple and produces realistic results. In the actual cosmic environment, the background is approximately a 3K blackbody, and the thermal radiation to the spacecraft is negligible. Therefore, apart from solar radiation, deep-space spacecraft are not affected by additional radiative heat flow.

[0003] In the ground-based simulation environment, a space environment simulator is used to simulate the cosmic environment, while a solar simulator is used to simulate the actual solar radiation heat flow. The heat (light) source of the solar simulator passes through an integrator and is then emitted from the light outlet of the space environment simulator onto a reflector, which reflects the light onto the test specimen, thus simulating the solar radiation heat flow.

[0004] During the simulation, some conditions differed significantly from the actual space environment. First, the space environment simulator's heat sink established a 100K cold background, rather than a blackbody close to 3K, which resulted in additional thermal radiation for the experiment. Second, no heat sink was installed at the light exit point, leading to a significant temperature rise at this location when the solar simulator irradiated the sample, acting as an additional heat source. Finally, the solar simulator's reflective surface, due to the increased temperature under irradiation, not only reflected the simulated solar radiation heat flux but also generated additional infrared radiation, again posing an additional heat source for the sample. These additional thermal radiations are referred to as background heat flux.

[0005] Therefore, how to accurately measure the specific value of background heat flux has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] This invention provides a method for measuring background heat flux based on a solar simulator thermal balance test, which solves the problem that existing technologies cannot accurately measure the specific values ​​of various background heat fluxes.

[0007] In a first aspect, the present invention provides a method for measuring background heat flux based on a solar simulator thermal balance experiment, comprising:

[0008] The conditions for controlling the thermal balance test of the solar simulator are entered into the first operating condition of turning on the heat sink and turning off the solar simulator.

[0009] Obtain the background heat flow of the heat sink caused by the absence of heat sinks at the light outlet and the reflector under the first working condition;

[0010] The conditions for controlling the thermal balance test of the solar simulator are entered into the second operating condition of turning on the heat sink and starting the solar simulator.

[0011] Under the second operating condition, when the temperatures at the light outlet, heat sink, and reflector are stable, the background heat flow of the heat sink caused by the absence of a heat sink at the light outlet and reflector, the background heat flow of the temperature rise at the light outlet caused by the solar simulator irradiation, and the background heat flow of the temperature rise at the reflector caused by the solar simulator irradiation are obtained, and the sum of the three is determined.

[0012] The conditions for controlling the thermal balance test of the solar simulator are: turning on the heat sink, turning off the solar simulator, turning on the heating plate on the back of the reflector, and adjusting the temperature of the reflector to the same as the temperature of the reflector in the second working condition;

[0013] The heat sink background heat flow caused by the absence of heat sinks at the light outlet and the reflector under the third working condition, and the reflector temperature rise background heat flow caused by temperature control of the reflector, are obtained, and the sum of the two is determined.

[0014] The temperature rise background heat flow at the reflector is obtained by subtracting the sum of the two from the background heat flow of the heat sink.

[0015] The background heat flux at the light outlet is obtained by subtracting the sum of the three from the sum of the two.

[0016] The background heat flux measurement method based on a solar simulator thermal balance test provided by the present invention further includes:

[0017] The test piece is fixed on the motion simulator, and a cold plate with liquid nitrogen is installed between the motion simulator and the test piece. The state of the cold plate is consistent with the heat sink of the motion simulator to eliminate the background heat flow generated by the power consumption of the motor of the motion simulator.

[0018] The heat flow reaching each surface is measured by installing heat flow meters on each surface of the test piece.

[0019] Temperature measuring devices were installed at the light outlet, heat sink, and reflector of the solar simulator thermal balance test to determine the temperature changes at each location. Heating pads were pinned to the back of the reflector.

[0020] Prepare the conditions for completing the first working condition, the second working condition, and the third working condition.

[0021] According to the present invention, a method for measuring background heat flux based on a solar simulator thermal balance test is provided, wherein the heat flux meter includes a black sheet type heat flux meter and a square fortress type heat flux meter;

[0022] The black sheet type heat flow meter and the square fort type heat flow meter have different absorption rates in the visible spectrum and infrared spectrum. The magnitude of solar radiation heat flow and the magnitude of background heat flow under the current state can be obtained by measuring the surface temperature of the black sheet type heat flow meter and the square fort type heat flow meter.

[0023] According to the present invention, a method for measuring background heat flux based on a solar simulator thermal balance experiment, after obtaining the background heat flux at the light outlet, further includes:

[0024] Determine the test requirements, and determine the heat flux sensor's sensing direction based on those requirements;

[0025] Determine the angular coefficient for each of the aforementioned sensitive directions;

[0026] Based on the angle coefficient, the test procedure is repeated under the conditions of the first working condition, the second working condition, and the third working condition.

[0027] According to the present invention, a method for measuring background heat flux based on a solar simulator thermal balance test is provided. The background heat flux of the heat sink, the background heat flux of the temperature rise at the light outlet, and the background heat flux of the temperature rise at the reflector under the first working condition, the second working condition, and the third working condition are all measured by a heat flux meter.

[0028] The heat flux calculation formula for the heat flux meter is:

[0029] q=εσT 4 ;

[0030] Where Q is the heat flux, ε is the emissivity of the heat flux meter surface, and σ is the Stefan-Boltzmann constant, 5.67e⁻⁸ W / m². 2 / K 4 T is the surface temperature of the heat flow meter.

[0031] According to the present invention, a method for measuring background heat flux based on a solar simulator thermal balance experiment is provided, wherein the heat flux includes heat flux corresponding to the visible spectral band and the infrared spectral band, as follows:

[0032] Q = α1q1 + α2q2;

[0033] Where α1 is the absorptivity of solar radiation, α2 is the absorptivity of infrared radiation, Q1 is the heat flux in the visible spectrum, and Q2 is the heat flux in the infrared spectrum.

[0034] According to the present invention, a method for measuring background heat flux based on a solar simulator thermal balance experiment is provided. The heat flux meter includes a black plate type heat flux meter and a square fort type heat flux meter. The heat flux calculation formulas for the black plate type heat flux meter and the square fort type heat flux meter are as follows:

[0035] α 1-1q1+α 2-1 q2=ε1σt 4 ;

[0036] α 1-2 q1+α 2-2 q2=ε2σT 4 ;

[0037] Where, α 1-1 α represents the absorptivity of solar radiation corresponding to the black plate type heat flow meter. 2-1 α represents the absorptivity of infrared radiation corresponding to the black-plate type heat flow meter. 1-2 α represents the absorptivity of solar radiation corresponding to the square-shaped heat flow meter. 2-2 ε1 is the absorptivity of infrared radiation corresponding to the square-shaped heat flow meter, ε2 is the surface emissivity of the black sheet type heat flow meter, and ε3 is the surface emissivity of the square-shaped heat flow meter.

[0038] By combining the heat flow calculation formulas of the black sheet type heat flow meter and the square fortress type heat flow meter, the infrared spectrum heat flow is obtained as the background heat flow.

[0039] The background heat flux measurement method based on a solar simulator thermal balance test provided by the present invention further includes:

[0040] Determine the measurement sequence for the first working condition, the second working condition, and the third working condition.

[0041] Secondly, the present invention also provides a background heat flux measurement device based on a solar simulator thermal balance test, comprising:

[0042] The first measurement module is used to control the conditions of the solar simulator thermal balance test to enter the first working condition of turning on the heat sink and turning off the solar simulator; and to obtain the background heat flow of the heat sink caused by the absence of heat sinks at the light outlet and the reflector under the first working condition.

[0043] The second measurement module is used to control the conditions of the solar simulator thermal balance test to enter the second working condition of turning on the heat sink and turning on the solar simulator; under the second working condition, when the temperature at the light outlet, the heat sink and the reflector are stable, the module acquires the background heat flow of the heat sink caused by the absence of heat sink at the light outlet and the reflector, the background heat flow of the temperature rise at the light outlet caused by the solar simulator irradiation, and the background heat flow of the temperature rise at the reflector caused by the solar simulator irradiation, and determines the sum of the three.

[0044] The third measurement module is used to control the conditions of the solar simulator thermal balance test to enter the third working condition, which involves turning on the heat sink, turning off the solar simulator, turning on the heating plate on the back of the reflector, and adjusting the temperature of the reflector to be consistent with the temperature of the reflector in the second working condition; to obtain the background heat flow of the heat sink caused by the absence of heat sinks at the light outlet and the reflector in the third working condition, and the background heat flow of the reflector temperature rise caused by the temperature control of the reflector, and to determine the sum of the two.

[0045] The determination module is used to obtain the temperature rise background heat flow at the reflector by subtracting the sum of the two from the background heat flow of the heat sink; and to obtain the temperature rise background heat flow at the light outlet by subtracting the sum of the three from the sum of the two.

[0046] Thirdly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the background heat flux measurement method based on the solar simulator thermal balance test as described above.

[0047] Fourthly, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the background heat flux measurement method based on the solar simulator thermal balance test as described above.

[0048] Fifthly, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the background heat flux measurement method based on the solar simulator thermal balance test as described above.

[0049] The present invention provides a method for measuring background heat flux based on a solar simulator thermal balance test, comprising: controlling the conditions of the solar simulator thermal balance test to enter a first operating condition of turning on the heat sink and turning off the solar simulator; acquiring the background heat flux of the heat sink caused by the absence of heat sinks at the light outlet and the reflector under the first operating condition; controlling the conditions of the solar simulator thermal balance test to enter a second operating condition of turning on the heat sink and turning on the solar simulator; acquiring the background heat flux of the heat sink caused by the absence of heat sinks at the light outlet and the reflector, the background heat flux of the temperature rise at the light outlet caused by the solar simulator irradiation, and the background heat flux of the temperature rise at the reflector caused by the solar simulator irradiation, and determining the sum of the three; controlling the conditions of the solar simulator thermal balance test to enter a second operating condition of turning on the heat sink and turning on the solar simulator; acquiring the background heat flux of the heat sink caused by the absence of heat sinks at the light outlet and the reflector, the background heat flux of the temperature rise at the light outlet caused by the solar simulator irradiation, and determining the sum of the three; controlling the conditions of the solar simulator thermal balance test to enter a first operating condition of turning on the heat sink and turning off the solar simulator; acquiring the background heat flux of the heat sink caused by the absence of heat sinks at the light outlet and the reflector, the background heat flux of the temperature rise at the reflector caused by the solar simulator irradiation, and determining the sum of the three; controlling the conditions of the solar simulator thermal balance test to enter a second operating condition of turning on the heat sink and turning on the solar simulator; acquiring the background heat flux of the heat sink caused by the absence of heat sinks at the light outlet and the reflector, the background heat flux of the temperature rise at the light outlet caused by the solar simulator irradiation, and determining the sum of the three; controlling the conditions of the solar simulator thermal balance test to enter a second operating condition of turning on the heat sink and turning on the solar simulator; acquiring the background heat flux of the heat sink caused by the absence of heat sinks at the light outlet and the reflector, the background heat flux of the temperature rise at the light The test conditions are as follows: the heat sink is turned on, the solar simulator is turned off, and the heating element on the back of the reflector is turned on. The temperature of the reflector is adjusted to the same level as the temperature of the reflector in the second test condition. The background heat flow of the heat sink caused by the absence of heat sinks at the light outlet and the reflector in the third test condition, and the background heat flow of the reflector temperature rise caused by the temperature control of the reflector are obtained. The sum of the two is determined. The difference between the sum of the two and the background heat flow of the heat sink is used to obtain the background heat flow of the reflector temperature rise. The difference between the sum of the three and the sum of the two is used to obtain the background heat flow of the light outlet temperature rise. Different sums of background heat flows can be measured under different test conditions. Then, by calculating the difference, the values ​​of the three different background heat flows can be accurately determined, which improves the efficiency of background heat flow measurement. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0051] Figure 1 This is a flowchart illustrating the background heat flux measurement method based on a solar simulator thermal balance test provided in this embodiment.

[0052] Figure 2 This is a schematic diagram of the solar simulator test system provided in this embodiment;

[0053] Figure 3 This is a schematic diagram of the background heat flow measurement device based on the solar simulator thermal balance test provided in this embodiment;

[0054] Figure 4 This is a schematic diagram of the structure of the electronic device provided in this embodiment. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0056] Figure 1 This is a flowchart illustrating the background heat flux measurement method based on a solar simulator thermal balance experiment provided in this embodiment. Figure 2 This is a schematic diagram of the solar simulator test system provided in this embodiment.

[0057] like Figure 1 and Figure 2 As shown in the figure, the method for measuring background heat flux based on a solar simulator thermal balance test provided by this invention mainly includes the following steps:

[0058] 101. The conditions for controlling the thermal balance test of the solar simulator are to enter the first operating condition of turning on the heat sink and turning off the solar simulator.

[0059] In a specific implementation process, the solar simulator system, such as Figure 2 As shown. The experiment was conducted in a space environment simulator. The container was lined with a heat sink, which was heated to 100K with liquid nitrogen flowing through it. The xenon lamp light source was uniformly collimated by an integrator and then shone onto a reflector through the light outlet, and was reflected by the reflector onto the surface of the test piece.

[0060] The background heat flow mainly comes from three sources: infrared radiation caused by the 100K heat sink; infrared radiation caused by the heat rise of the mirror emitting simulated sunlight; and infrared radiation caused by the lack of a heat sink at the light outlet, where the temperature is higher than the 100K heat sink. At the same time, after the equipment is turned on, the non-collimated simulated sunlight causes a temperature rise at the light outlet, resulting in infrared radiation from the temperature rise at the light outlet.

[0061] Therefore, to accurately measure the specific value of background heat flux, the test piece needs to be fixed on the motion simulator. A cold plate filled with liquid nitrogen is installed between the motion simulator and the test piece, with the cold plate in the same state as the heat sink of the motion simulator to eliminate the background heat flux generated by the power consumption of the motion simulator's motor. Heat flux meters are installed on each surface of the test piece to measure the heat flux reaching each surface. Temperature measuring devices are installed at the light outlet, heat sink, and reflector of the solar simulator's thermal balance test to determine the temperature changes at each location. Heating elements are pinned to the back of the reflector. This completes the preparation of the test system, allowing for the preparation and testing of the first, second, and third operating conditions.

[0062] Heat flow meters include sheet heat flow meters and fortress heat flow meters. Sheet heat flow meters and fortress heat flow meters have different absorption rates in the visible and infrared spectrum bands. The magnitude of solar radiation heat flow and the magnitude of background heat flow under the current state can be obtained by measuring the surface temperature of sheet heat flow meters and fortress heat flow meters.

[0063] After the experimental preparation is completed, the measurement can begin. The measurement is carried out under three operating conditions. The division of the three operating conditions is mainly based on the three sources of background heat flow. Since the measurement is of the overall background heat flow, the influence of each background heat flow can be screened by comparing different amounts of heat under the three operating conditions.

[0064] The first step is to initiate the first operating condition, which involves controlling the conditions for the solar simulator thermal balance test to activate the heat sink and shut down the solar simulator.

[0065] 102. Obtain the background heat flow of the heat sink caused by the absence of heat sinks at the light outlet and the reflector under the first working condition.

[0066] After starting the first operating condition, wait until the temperatures at the light output port, heat sink, and reflector stabilize, and the heat flux count value stabilizes, then record the infrared radiation heat flux received at this time. At this time, the temperature of the part with the heat sink is 100K, while the temperature at the light output port and reflector is higher than 100K because there is no heat sink. The background heat flux caused by these parts is collectively referred to as the heat sink background heat flux, denoted as Q1.

[0067] 103. The conditions for controlling the thermal balance test of the solar simulator are entered into the second operating condition of turning on the heat sink and starting the solar simulator.

[0068] The second operating condition is based on the first operating condition, with the heat sink still running, and then the solar simulator is turned on. Therefore, the background heat flux measured in the second operating condition includes Q1 and the background heat flux generated by the solar simulator's irradiation.

[0069] 104. Under the second operating condition, when the temperatures at the light outlet, heat sink, and reflector are stable, obtain the background heat flow of the heat sink caused by the absence of heat sinks at the light outlet and reflector, the background heat flow of the light outlet caused by the temperature rise due to the solar simulator irradiation, and the background heat flow of the reflector caused by the temperature rise due to the solar simulator irradiation, and determine the sum of the three.

[0070] Once the temperatures of the heat sink and reflector at the light exit point and the heat flux count have stabilized, record the temperature values ​​and radiant heat flux received by each part. At this point, the temperature of the part with the heat sink is still 100K. The temperatures at the light exit point and the reflector, due to the absence of a heat sink and the influence of solar simulator radiation, are much higher than 100K. Therefore, in addition to Q1 from the first operating condition, the background heat flux also includes the background heat flux caused by the temperature rise due to solar simulator radiation. The background heat flux at the light exit point due to the temperature rise is Q2, and the background heat flux at the reflector due to the temperature rise is Q3. The total value of Q1 + Q2 + Q3 can be obtained through heat flux calculation.

[0071] 105. Control the conditions of the solar simulator thermal balance test to enter the third working condition: turn on the heat sink, turn off the solar simulator, turn on the heating plate on the back of the reflector, and adjust the temperature of the reflector to be consistent with the temperature of the reflector in the second working condition.

[0072] After completing the measurements of the first and second operating conditions, the operating conditions are adjusted by turning on the heat sink, turning off the solar simulator, and turning on the heating plate on the back of the reflector to adjust the temperature of the reflector to be the same as the temperature of the reflector in the second operating condition. At this time, it is in the third operating condition. The difference between the third operating condition and the second operating condition is that there is no irradiation from the solar simulator. Therefore, there is no background heat flow Q2 at the light outlet.

[0073] 106. Obtain the background heat flow of the heat sink caused by the absence of heat sinks at the light outlet and the reflector under the third working condition, and the background heat flow of the reflector temperature rise caused by the temperature control of the reflector, and determine the sum of the two.

[0074] Once the temperatures of the heat sink and reflector at the light outlet stabilize, and the heat flux count stabilizes, record the temperature values ​​and radiant heat flux received by each part. At this point, the temperature of the part with the heat sink is still 100K. Since there is no solar simulator irradiation, the temperature at the light outlet is the same as in the first condition. Due to the temperature control of the reflector, the background heat flux at the reflector is Q3. A heating plate is used to heat the reflector to replace the temperature generated by the solar simulator irradiation. Therefore, the background heat flux in the third condition includes the background heat flux from the heat sink Q1 and the background heat flux from the temperature rise at the reflector Q3. By solving, the sum of Q1 and Q3 can be obtained.

[0075] 107. The temperature rise background heat flow at the reflector is obtained by subtracting the sum of the two from the background heat flow of the heat sink.

[0076] The background heat flux obtained under the first operating condition is the heat sink background heat flux Q1. The background heat flux obtained under the second operating condition is the heat sink background heat flux Q1, the temperature rise background heat flux at the light outlet Q2, and the temperature rise background heat flux at the reflector Q3. The background heat flux obtained under the third operating condition is the heat sink background heat flux Q1 and the temperature rise background heat flux at the reflector Q3.

[0077] Therefore, by subtracting the two background heat flows under the third operating condition from the one background heat flow under the first operating condition, the background heat flow Q3 at the reflector can be obtained.

[0078] 108. By subtracting the sum of the three from the sum of the two, the background heat flow at the light outlet can be obtained.

[0079] Similar to the above method of subtraction, by subtracting the three background heat flows under the second operating condition from the two background heat flows under the third operating condition, the background heat flow at the light outlet can be obtained.

[0080] Thus, the background heat flux Q1 of the heat sink, the background heat flux Q2 of the temperature rise at the light outlet, and the background heat flux of the temperature rise at the reflector were successfully obtained. In this embodiment, the heat flux is preferably measured in the order of the first operating condition, the second operating condition, and the third operating condition. This order can effectively shorten the measurement time for different operating conditions and improve the efficiency of the strategy.

[0081] In all cases, whether it is the first, second, or third operating condition, the different background heat fluxes are calculated by measuring them with a heat flux meter; the calculation formula for the heat flux meter is (1):

[0082] q=εσT 4 (1);

[0083] Where q is the heat flux, ε is the emissivity of the heat flux meter surface, and σ is the Stefan-Boltzmann constant, 5.67e⁻⁸ W / m². 2 / K 4 T is the surface temperature of the heat flow meter.

[0084] The heat flow includes the heat flow corresponding to the visible spectrum and the infrared spectrum. The functional relationship between the heat flow and the temperature is related to the surface material parameters of the heat flow meter. The absorptivity of the visible spectrum and the infrared spectrum are different. Therefore, the heat flow reaching the surface of the heat flow meter can be denoted as (2):

[0085] q=α1q1+α2q2 (2);

[0086] Where α1 is the absorptivity of solar radiation, α2 is the absorptivity of infrared radiation, q1 is the heat flux in the visible spectrum, and q2 is the heat flux in the infrared spectrum.

[0087] The heat flow meters in this embodiment include a black-plate type heat flow meter and a square-fortress type heat flow meter. By combining equations (1) and (2), we can obtain (3) and (4):

[0088] α 1-1 q1+α 2-1 q2=ε1σT 4 (3);

[0089] α 1-2 q1+α2-2 q2=ε2σT 4 (4);

[0090] Where, α 1-1 α represents the absorptivity of solar radiation corresponding to the black plate type heat flow meter. 2-1 α represents the absorptivity of infrared radiation corresponding to the black-plate type heat flow meter. 1-2 α represents the absorptivity of solar radiation corresponding to the square-shaped heat flow meter. 2-2 ε1 is the absorptivity of infrared radiation corresponding to the square-shaped heat flow meter, ε2 is the surface emissivity of the black sheet type heat flow meter, and ε3 is the surface emissivity of the square-shaped heat flow meter.

[0091] The surface temperature of different heat flow meters can be obtained separately. At the same time, the absorptivity and surface emissivity of the visible and infrared spectrum of the two heat flow meters are known. q1 and q2 can be calculated through two equations. The infrared radiation heat flow is the background heat flow.

[0092] Therefore, by using heat flux calculation, the different background heat fluxes under the first, second, and third operating conditions can be accurately calculated respectively.

[0093] Furthermore, based on the above embodiments, this embodiment, after obtaining the background heat flux of the temperature rise at the light outlet, also includes: determining the test requirements and determining the sensitive direction of the heat flux meter based on the test requirements; determining the angular coefficient of each sensitive direction; and repeating the test process under the conditions of the first, second, and third operating conditions based on the angular coefficients.

[0094] Specifically, the angular coefficient is the percentage of radiant energy emitted from one surface that falls onto another. It reflects the geometric and positional relationship between different objects that radiate each other. Therefore, to ensure the accuracy of the measurement results, multiple measurements need to be taken in different directions. The test direction can be determined according to the user's needs. By having the user determine the test direction and taking measurements in different directions, the final results can better meet the user's requirements.

[0095] The background heat flux measurement method of this invention is applied to the testing of deep space exploration spacecraft. Because deep space exploration spacecraft are far from Earth's orbit, solar radiation is relatively small compared to Earth's orbit, thus increasing the proportion of background heat flux and making it more influential. By measuring the background heat flux in advance using this method, the sources of background heat flux, the magnitude of background heat flux from each source, and its impact are clarified. This provides a good experimental data foundation for correcting the thermal model, meets the requirements for verifying the rationality of satellite thermal design, achieves accurate measurement of background heat flux, plays a key role in verifying product thermal design and thermal impact, effectively ensures the smooth conduct of multiple tests, and contributes to ensuring the smooth advancement of multiple models.

[0096] Based on the same general inventive concept, this invention also protects a background heat flow measurement device based on a solar simulator thermal balance test. The background heat flow measurement device based on a solar simulator thermal balance test described below and the background heat flow measurement method based on a solar simulator thermal balance test described above can be referred to in correspondence with each other.

[0097] Figure 3 This is a schematic diagram of the background heat flow measurement device based on the solar simulator thermal balance test provided in this embodiment.

[0098] like Figure 3 As shown, this embodiment provides a background heat flux measurement device based on a solar simulator thermal balance test, comprising:

[0099] The first measurement module 301 is used to control the conditions of the solar simulator thermal balance test to enter the first working condition of turning on the heat sink and turning off the solar simulator; and to obtain the background heat flow of the heat sink caused by the absence of heat sinks at the light outlet and the reflector under the first working condition.

[0100] The second measurement module 302 is used to control the conditions of the solar simulator thermal balance test to enter the second working condition of turning on the heat sink and turning on the solar simulator; under the second working condition, when the temperature at the light outlet, the heat sink and the reflector are stable, the module acquires the background heat flow of the heat sink caused by the absence of heat sink at the light outlet and the reflector, the background heat flow of the temperature rise at the light outlet caused by the solar simulator irradiation, and the background heat flow of the temperature rise at the reflector caused by the solar simulator irradiation, and determines the sum of the three.

[0101] The third measurement module 303 is used to control the conditions of the solar simulator thermal balance test to enter the third working condition, which involves turning on the heat sink, turning off the solar simulator, turning on the heating plate on the back of the reflector, and adjusting the temperature of the reflector to be consistent with the temperature of the reflector in the second working condition; to obtain the background heat flow of the heat sink caused by the absence of heat sinks at the light outlet and the reflector in the third working condition, and the background heat flow of the reflector temperature rise caused by the temperature control of the reflector, and to determine the sum of the two.

[0102] The determination module 304 is used to obtain the temperature rise background heat flow at the reflector by subtracting the sum of the two from the background heat flow of the heat sink; and to obtain the temperature rise background heat flow at the light outlet by subtracting the sum of the three from the sum of the two.

[0103] Figure 4 This is a schematic diagram of the structure of the electronic device provided in this embodiment.

[0104] like Figure 4As shown, the electronic device may include: a processor 410, a communication interface 420, a memory 430, and a communication bus 440, wherein the processor 410, the communication interface 420, and the memory 430 communicate with each other through the communication bus 440. The processor 410 can call logical instructions in the memory 430 to execute a method for measuring background heat flux based on a solar simulator thermal balance test. This method includes: controlling the conditions of the solar simulator thermal balance test to enter a first operating condition of turning on the heat sink and turning off the solar simulator; acquiring the background heat flux of the heat sink caused by the absence of heat sinks at the light outlet and the reflector under the first operating condition; controlling the conditions of the solar simulator thermal balance test to enter a second operating condition of turning on the heat sink and turning on the solar simulator; and, under the second operating condition, when the temperatures at the light outlet, the heat sink, and the reflector are stable, acquiring the background heat flux of the heat sink caused by the absence of heat sinks at the light outlet and the reflector, and the background heat flux of the temperature rise at the light outlet caused by solar simulator irradiation. The sum of the three factors is determined: the background heat flux at the reflector caused by the solar simulator's illumination, and the temperature rise at the reflector due to the temperature rise at the reflector. The conditions for controlling the solar simulator's thermal balance test are: turning on the heat sink, turning off the solar simulator, and turning on the heating plate on the back of the reflector to adjust the reflector temperature to the same as the reflector temperature in the second condition. The background heat flux at the heat sink caused by the absence of heat sinks at the light outlet and the reflector under the third condition, and the background heat flux at the temperature rise of the reflector caused by the temperature control of the reflector are obtained, and their sum is determined. The difference between the sum of the two and the background heat flux at the heat sink is used to obtain the background heat flux at the reflector. The difference between the sum of the three factors and the sum of the two factors is used to obtain the background heat flux at the light outlet.

[0105] Furthermore, the logical instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0106] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the background heat flow measurement method based on the solar simulator thermal balance test provided by the above methods. The method includes: controlling the conditions of the solar simulator thermal balance test to enter a first operating condition of turning on the heat sink and turning off the solar simulator; obtaining the background heat flow of the heat sink caused by the absence of heat sinks at the light outlet and the reflector under the first operating condition; controlling the conditions of the solar simulator thermal balance test to enter a second operating condition of turning on the heat sink and turning on the solar simulator; and in the second operating condition, when the temperatures at the light outlet, the heat sink, and the reflector are stable, obtaining the background heat flow caused by the absence of heat sinks at the light outlet and the reflector. The background heat flux caused by the heat sink, the background heat flux caused by the temperature rise at the light outlet due to solar simulator irradiation, and the background heat flux caused by the temperature rise at the reflector due to solar simulator irradiation are summed. The conditions for controlling the solar simulator thermal balance test are: turning on the heat sink, turning off the solar simulator, and turning on the heating plate on the back of the reflector to adjust the temperature of the reflector to be consistent with the temperature of the reflector in the second working condition. The background heat flux caused by the absence of heat sinks at the light outlet and the reflector in the third working condition, and the background heat flux caused by the temperature control of the reflector are summed. The temperature rise background heat flux at the reflector is obtained by subtracting the sum of the two from the background heat flux of the heat sink. The temperature rise background heat flux at the light outlet is obtained by subtracting the sum of the three from the sum of the two.

[0107] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the background heat flux measurement method based on a solar simulator thermal balance test provided by the above methods. The method includes: controlling the conditions of the solar simulator thermal balance test to enter a first operating condition of turning on the heat sink and turning off the solar simulator; acquiring the background heat flux of the heat sink caused by the absence of heat sinks at the light outlet and reflector under the first operating condition; controlling the conditions of the solar simulator thermal balance test to enter a second operating condition of turning on the heat sink and turning on the solar simulator; and, under the second operating condition, when the temperatures at the light outlet, heat sink, and reflector are stable, acquiring the background heat flux of the heat sink caused by the absence of heat sinks at the light outlet and reflector, and the background heat flux caused by the absence of heat sinks at the light outlet and reflector, and the background heat flux caused by the absence of heat sinks at the light outlet and reflector, and the background heat flux caused by the absence of heat sinks at the light outlet and reflector, respectively. The sum of the background heat flux at the light outlet caused by simulator irradiation and the background heat flux at the reflector caused by solar simulator irradiation is determined. The conditions for controlling the solar simulator thermal balance test are: turning on the heat sink, turning off the solar simulator, and turning on the heating plate on the back of the reflector to adjust the reflector temperature to the same as the reflector temperature in the second condition. The background heat flux at the heat sink caused by the absence of heat sinks at the light outlet and the reflector in the third condition, and the background heat flux at the reflector temperature rise caused by reflector temperature control are obtained, and their sum is determined. The difference between the sum of the two and the background heat flux at the heat sink is used to obtain the background heat flux at the reflector temperature rise. The difference between the sum of the three and the sum of the two is used to obtain the background heat flux at the light outlet temperature rise.

[0108] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0109] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for measuring background heat flux based on a solar simulator thermal balance experiment, characterized in that, include: The conditions for controlling the thermal balance test of the solar simulator are entered into the first operating condition of turning on the heat sink and turning off the solar simulator. Obtain the background heat flow of the heat sink caused by the absence of heat sinks at the light outlet and the reflector under the first working condition; The conditions for controlling the thermal balance test of the solar simulator are entered into the second operating condition of turning on the heat sink and starting the solar simulator. Under the second operating condition, when the temperatures at the light outlet, heat sink, and reflector are stable, the background heat flow of the heat sink caused by the absence of a heat sink at the light outlet and reflector, the background heat flow of the temperature rise at the light outlet caused by the solar simulator irradiation, and the background heat flow of the temperature rise at the reflector caused by the solar simulator irradiation are obtained, and the sum of the three is determined. The conditions for controlling the thermal balance test of the solar simulator are: turning on the heat sink, turning off the solar simulator, turning on the heating plate on the back of the reflector, and adjusting the temperature of the reflector to the same as the temperature of the reflector in the second working condition; The heat sink background heat flow caused by the absence of heat sinks at the light outlet and the reflector under the third working condition, and the reflector temperature rise background heat flow caused by temperature control of the reflector, are obtained, and the sum of the two is determined. The temperature rise background heat flow at the reflector is obtained by subtracting the sum of the two from the background heat flow of the heat sink. The background heat flux at the light outlet is obtained by subtracting the sum of the three from the sum of the two.

2. The method for measuring background heat flux based on a solar simulator thermal balance experiment according to claim 1, characterized in that, Also includes: The test piece is fixed on the motion simulator, and a cold plate with liquid nitrogen is installed between the motion simulator and the test piece. The state of the cold plate is consistent with the heat sink of the motion simulator to eliminate the background heat flow generated by the power consumption of the motor of the motion simulator. By installing heat flow meters on each surface of the test piece, the heat flow reaching each surface is measured; Temperature measuring devices were installed at the light outlet, heat sink, and reflector of the solar simulator thermal balance test to determine the temperature changes at each location, and heating pads were attached to the back of the reflector. Prepare the conditions for completing the first working condition, the second working condition, and the third working condition.

3. The method for measuring background heat flux based on a solar simulator thermal balance experiment according to claim 2, characterized in that, The heat flow meter includes a black-plate type heat flow meter and a square-fortress type heat flow meter; The black sheet type heat flow meter and the square fort type heat flow meter have different absorption rates in the visible spectrum and infrared spectrum. The magnitude of solar radiation heat flow and the magnitude of background heat flow under the current state can be obtained by measuring the surface temperature of the black sheet type heat flow meter and the square fort type heat flow meter.

4. The method for measuring background heat flux based on a solar simulator thermal balance experiment according to claim 1, characterized in that, After obtaining the background heat flux at the light outlet, the method further includes: Determine the test requirements, and determine the heat flux sensor's sensing direction based on those requirements; Determine the angular coefficient for each of the aforementioned sensitive directions; Based on the angle coefficient, the test procedure is repeated under the conditions of the first working condition, the second working condition, and the third working condition.

5. The method for measuring background heat flux based on a solar simulator thermal balance experiment according to claim 1, characterized in that, The background heat flux of the heat sink, the background heat flux of the temperature rise at the light outlet, and the background heat flux of the temperature rise at the reflector under the first, second, and third operating conditions were all measured by a heat flux meter. The heat flux calculation formula for the heat flux meter is: q=εσT 4 ; Where q is the heat flux, ε is the emissivity of the heat flux meter surface, and σ is the Stefan-Boltzmann constant, 5.67e⁻⁸ W / m². 2 / K 4 T is the surface temperature of the heat flow meter.

6. The method for measuring background heat flux based on a solar simulator thermal balance experiment according to claim 5, characterized in that, The heat flux includes heat fluxes corresponding to the visible spectral band and the infrared spectral band, as follows: q = α1q1 + α2q2; Where α1 is the absorptivity of solar radiation, α2 is the absorptivity of infrared radiation, q1 is the heat flux in the visible spectrum, and q2 is the heat flux in the infrared spectrum.

7. The method for measuring background heat flux based on a solar simulator thermal balance experiment according to claim 6, characterized in that, The heat flow meter includes a black-plate type heat flow meter and a square-fortress type heat flow meter. The heat flow calculation formulas for the black-plate type heat flow meter and the square-fortress type heat flow meter are as follows: a 1-1 q1+a 2-1 q2=ε1σt 4 ; a 1-2 q1+a 2-2 q2=ε2σT 4 ; Where, α 1-1 α represents the absorptivity of solar radiation corresponding to the black plate type heat flow meter. 2-1 α represents the absorptivity of infrared radiation corresponding to the black-plate type heat flow meter. 1-2 α represents the absorptivity of solar radiation corresponding to the square-shaped heat flow meter. 2-2 ε1 is the absorptivity of infrared radiation corresponding to the square-shaped heat flow meter, ε2 is the surface emissivity of the black sheet type heat flow meter, and ε3 is the surface emissivity of the square-shaped heat flow meter. By combining the heat flow calculation formulas of the black sheet type heat flow meter and the square fortress type heat flow meter, the infrared spectrum heat flow is obtained as the background heat flow.

8. The method for measuring background heat flux based on a solar simulator thermal balance experiment according to any one of claims 1-7, characterized in that, Also includes: Determine the measurement sequence for the first working condition, the second working condition, and the third working condition.

9. A background heat flux measurement device based on a solar simulator thermal balance experiment, characterized in that, include: The first measurement module is used to control the conditions of the solar simulator thermal balance test to enter the first working condition of turning on the heat sink and turning off the solar simulator. Obtain the background heat flow of the heat sink caused by the absence of heat sinks at the light outlet and the reflector under the first working condition; The second measurement module is used to control the conditions of the solar simulator thermal balance test to enter the second working condition of turning on the heat sink and starting the solar simulator. Under the second operating condition, when the temperatures at the light outlet, heat sink, and reflector are stable, the background heat flow of the heat sink caused by the absence of a heat sink at the light outlet and reflector, the background heat flow of the temperature rise at the light outlet caused by the solar simulator irradiation, and the background heat flow of the temperature rise at the reflector caused by the solar simulator irradiation are obtained, and the sum of the three is determined. The third measurement module is used to control the conditions of the solar simulator thermal balance test to enter the third working condition, which involves turning on the heat sink, turning off the solar simulator, turning on the heating plate on the back of the reflector, and adjusting the temperature of the reflector to be consistent with the temperature of the reflector in the second working condition; to obtain the background heat flow of the heat sink caused by the absence of heat sinks at the light outlet and the reflector in the third working condition, and the background heat flow of the reflector temperature rise caused by the temperature control of the reflector, and to determine the sum of the two. The determination module is used to obtain the temperature rise background heat flow at the reflector by subtracting the sum of the two from the background heat flow of the heat sink; and to obtain the temperature rise background heat flow at the light outlet by subtracting the sum of the three from the sum of the two.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the background heat flux measurement method based on the solar simulator thermal balance test as described in any one of claims 1 to 8.

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