Online high-temperature testing device for microwave anechoic chamber

Abstract

The utility model discloses an online high-temperature testing device for a microwave anechoic chamber. The online high-temperature testing device comprises the microwave anechoic chamber, a wave-transparent heating furnace, a portal frame, a rotary test bed and a control unit, the microwave anechoic chamber is provided with a polyurethane wave-absorbing pyramid, a feed source, a compact range and a radar test instrument; when testing starts, a movable opening in the top of the microwave anechoic chamber is opened, a portal frame lifting device enters the microwave anechoic chamber to lift a furnace cover, a target body is placed in the wave-transparent heating furnace, the lifting device closes the furnace cover and leaves the microwave anechoic chamber, an opening of the microwave anechoic chamber is closed, and the wave-transparent heating furnace is electrified and heated through a control unit. After the temperature reaches a preset temperature, starting the radar test instrument and recording a test result; and the continuous electromagnetic characteristic change of the target body in a high-temperature state can be obtained by continuously heating and recording a result. The on-line high-temperature testing device can realize uniform heating and accurate temperature control of a target body in a microwave anechoic chamber radar testing process, electromagnetic characteristics of the target body in a high-temperature state are obtained, and a measurement result is reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave anechoic chamber radar testing, in particular to an on-line high-temperature testing device for a microwave anechoic chamber. Background Art

[0002] The high-temperature load (≥800 °C) generated by a hypersonic vehicle flying continuously at a high speed exceeding Mach 5 in the near space / atmosphere for a long time poses severe requirements on the stability of the electromagnetic stealth skin of the vehicle and the reliability of the surface structure. Therefore, it is particularly important to master the electromagnetic characteristics of stealth components in a high-temperature state.

[0003] The radar reflectivity is an important indicator to measure the stealth performance of components. At present, the RCS test method and the bow test method are mainly used for testing in microwave anechoic chamber laboratories. Due to safety considerations, the maximum ambient temperature in traditional microwave anechoic chambers is generally controlled below 70 °C; moreover, the metal devices of traditional heating devices seriously interfere with the accuracy of microwave testing. Therefore, the existing test conditions cannot perform performance index tests on stealth components in a specific high-temperature state. Due to the sensitivity of high-temperature RCS testing, there is little systematic research on microwave anechoic chamber radar testing of target bodies in a high-temperature state in existing foreign literature and public reports. Chinese Patent CN111766453B discloses a radar cross-section test system and method for a heating body, which can heat the target body to 1300 °C by using an electric heating device, and then start the displacement mechanism to withdraw the heating device. When the target body in a high-temperature state continuously dissipates heat and cools down to a certain threshold, the overall system is controlled to start the test program. The invention measures the radar cross-section of the heating body while avoiding the influence of the heating device and the displacement mechanism on the measurement accuracy of the test system. However, since the heating form used is traditional electric heating, it is impossible to avoid the temperature error caused by the continuous cooling of the heating body during the test, and it is even more impossible to perform real-time on-line heating and testing. Patent CN110687510B discloses a high-temperature target RCS test calibration method. Compared with the method of calibrating with a high-temperature standard body, heating the target after cooling in general high-temperature tests, this implementation method only needs to be heated once to complete the entire test calibration, and can realize the rapid test calibration of high-temperature target RCS. However, this method also cannot achieve on-line high-temperature testing.

[0004] Therefore, there is still a need to develop an on-line high-temperature testing device for a microwave anechoic chamber, which can be used for uniform heating and precise temperature control of the target body during radar testing, realize on-line radar testing of the target body in a high-temperature state, and provide data support for mastering the electromagnetic characteristics of stealth components in a high-temperature state. Summary of the Utility Model

[0005] The present utility model proposes an on-line high-temperature testing device for an anechoic chamber, aiming to solve the problems existing in the prior art and provide the equipment required for uniform heating, precise temperature control, and on-line testing during the radar testing process in the anechoic chamber.

[0006] To achieve the above object, the technical solution adopted by the present utility model is as follows: An on-line high-temperature testing device for an anechoic chamber, comprising an anechoic chamber, a wave-transmitting heating furnace, a gantry, a rotating test bench, and a control unit; the anechoic chamber is provided with polyurethane absorbing pyramids, a feed source, a compact range, and radar testing instruments; the radar testing instruments are used to complete the radar testing program after the target body is heated; the wave-transmitting heating furnace is used for on-line heating and heat preservation of the target body; the gantry is used for lifting and covering the furnace cover of the wave-transmitting heating furnace; the rotating test bench is used to carry and rotate the wave-transmitting heating furnace and the target body inside it; the control unit is used to control the operation of the wave-transmitting heating furnace, the rotating test bench, and the gantry.

[0007] The support of the gantry spans across the outside of the anechoic chamber. The top of the anechoic chamber is provided with a movable opening for the operation of the lifting device of the gantry. When the movable opening is opened, the lifting device enters the anechoic chamber to lift and cover the furnace cover of the wave-transmitting heating furnace to realize the picking and placing of the target body. When the lifting device leaves the anechoic chamber, the movable opening is closed; the polyurethane absorbing pyramids are attached to the inner wall of the anechoic chamber; the compact range, the feed source, and the rotating test bench are longitudinally arranged in the anechoic chamber in sequence. The wave-transmitting heating furnace is installed on the rotating test bench, and a polyurethane absorbing pyramid screen is provided between the rotating test bench and the feed source for electromagnetic protection to avoid the rotating test bench affecting the measurement accuracy of the testing system; the control unit and the radar testing instruments are placed outside the anechoic chamber and are connected to the mechanisms inside the chamber through wires.

[0008] According to the present utility model, the wave-transmitting heating furnace is made of a heat-resistant wave-transmitting ceramic / self-heating wave-transmitting mengene quartz fiber fabric composite material. The self-heating wave-transmitting mengene quartz fiber fabric is embedded in the central position inside the heat wave-transmitting ceramic to prepare a heat wave-transmitting ceramic / self-heating wave-transmitting mengene quartz fiber fabric "sandwich" structure composite material; if the self-heating wave-transmitting mengene quartz fiber fabric is biased towards the inner or outer side of the furnace wall, it will affect the heat transfer efficiency and structural strength. The heat wave-transmitting ceramic also plays a role in sealing and isolating air to prevent graphene from oxidizing when exposed to air at high temperatures.

[0009] According to the present utility model, the heat wave-transmitting ceramic is one or more composite ceramics among alumina ceramics, quartz ceramics, silicon nitride ceramics, silicon carbide ceramics, and zirconia ceramics. The forming methods that can be adopted are one or more of dry pressing, cold isostatic pressing, slip casting, gel casting, and hot die casting. Preferably, the heat wave-transmitting quartz ceramic is processed and formed by the slip casting method, which is convenient for producing large-size structural parts.

[0010] According to the present utility model, the self-heating mengene quartz fiber fabric is a graphene / quartz fiber composite material. By using the method of high-temperature chemical vapor deposition, a continuous graphene film is grown on the surface of the quartz fiber fabric, which has characteristics such as wave transmission, high conductivity, high thermal conductivity, and high infrared emission efficiency, and can achieve continuous adjustment of the surface resistance within the range of 30-5000 Ω / sq. Preferably, a self-heating mengene quartz fiber fabric with a surface resistance of 3000 Ω / sq is selected, which has both high wave transmission and high heat generation.

[0011] According to the present utility model, the dielectric constant and dielectric loss of the heat wave-transmitting ceramic material are low, the wave transmission rate is higher than 85%, and it can withstand high temperatures above 1000 °C. If the wave transmission rate of the heat wave-transmitting ceramic material is lower than 85%, the test accuracy will be affected, and if the temperature resistance is lower than 1000 °C, the use requirements cannot be met.

[0012] According to the present utility model, the self-heating mengene quartz fiber fabric has low dielectric constant and dielectric loss, a wave transmission rate higher than 85%, high strength, good flexibility, good self-heating uniformity, a fast heating rate, and good cycle stability. If the wave transmission rate of the self-heating mengene quartz fiber fabric is lower than 85%, the test accuracy will be affected.

[0013] According to the present utility model, the thickness of the self-heating mengene quartz fiber fabric is 1-5 mm. If the thickness is less than 1 mm, the strength is insufficient and the heat generation is insufficient, unable to meet the use requirements; if the thickness is greater than 5 mm, it is difficult to produce and manufacture, and the strength of the "sandwich" structure of the heat wave-transmitting ceramic / self-heating mengene quartz fiber fabric is reduced. Preferably, a self-heating mengene quartz fiber fabric with a thickness of 3 mm is selected.

[0014] According to the present utility model, the surface of the self-heating mengene quartz fiber fabric is penetrated by a "U"-shaped conductive electrode. When powered on, it can self-heat, and the temperature can be controlled by adjusting the voltage. The heating temperature reaches 800 °C, and the temperature control accuracy reaches ±1 °C.

[0015] According to the present utility model, the outside of the wave-transmitting heating furnace is integrally wrapped with asbestos, ceramic fiber cotton, or wave-transmitting heat insulation tiles to form a heat insulation layer, which plays a role in protection and heat preservation, improving safety and energy utilization efficiency. Preferably, 99 alumina ceramic fiber cotton is used as the heat insulation layer, which has excellent heat insulation effect and good economy.

[0016] According to the present utility model, the wave-transmitting heating furnace as a whole presents a "tea cup"-shaped cylindrical structure. The furnace bottom and the furnace wall are integrated, the furnace cover is a split type, a groove is processed on the inner side of the furnace cover, and a high-temperature resistant sealing silica gel gasket is arranged in the groove to form an assembly with the furnace body. A lifting ring is arranged on the top of the furnace cover to cooperate with the gantry for lifting; the wave-transmitting heating furnace has good overall sealing and heat preservation performance, and the wave transmission rate reaches more than 85%.

[0017] According to the present utility model, the inner diameter of the wave-transmitting heating furnace body is 300 - 700 mm, the height of the furnace body is 250 - 600 mm, and the wall thickness of the furnace body is 15 - 30 mm; if the inner diameter of the furnace body is less than 300 mm, most target bodies cannot be accommodated, and if the inner diameter of the furnace body is greater than 700 mm, the forming difficulty is too high; if the height of the furnace body is less than 250 mm, the target body cannot be accommodated, and if the height of the furnace body is greater than 600 mm, it cannot be formed; if the wall thickness is less than 15 mm, the strength is insufficient, and if the wall thickness is greater than 30 mm, the mass is too large. Preferably, the inner diameter of the furnace body is 500 mm, the height of the furnace body is 500 mm, and the wall thickness of the furnace body is 20 mm, which can meet the test requirements of most target body samples.

[0018] According to the present utility model, when the wave-transmitting heating furnace is powered on, the furnace body rapidly heats up and heats the internal target body through thermal radiation, and programmed heating and heat preservation of the target body can be maintained during the entire radar test process.

[0019] According to the present utility model, the radar test instrument starts the feed source to emit spherical waves, which are converted into pseudo-plane waves after passing through the compact range. The pseudo-plane waves pass through the wave-transmitting heating furnace and reach the high-temperature target body. The electromagnetic waves reflected by the high-temperature target body then pass through the compact range and the feed source in sequence and return to the radar test instrument. The radar test instrument receives the echo and analyzes and calculates to obtain the electromagnetic characteristics of the target body.

[0020] According to the present utility model, the control unit, as the master control device, is used to control the lifting and covering of the gantry, the heating temperature and heating speed of the wave-transmitting heating furnace, the rotation angle and rotation speed of the rotary test bench, and the operation of each device.

[0021] According to the present utility model, the polyurethane absorbing pyramids are made of solid polyurethane pyramidal absorbing materials, and the surfaces are pyramidal. The polyurethane absorbing pyramids covering the inner wall of the microwave anechoic chamber can resist electromagnetic interference, suppress clutter in communication and radar systems, etc.; made into absorbing screens, they can protect the rotary test bench in the test environment, effectively reduce background noise, eliminate clutter interference, and improve test accuracy.

[0022] The test method of a microwave anechoic chamber on-line high-temperature test device according to the present utility model is as follows: at the beginning of the test, open the movable opening at the top of the microwave anechoic chamber, the lifting device of the gantry enters the microwave anechoic chamber to lift the furnace cover, place the target body in the wave-transmitting heating furnace, the lifting device closes the furnace cover and leaves the microwave anechoic chamber, close the opening of the microwave anechoic chamber, energize and heat the wave-transmitting heating furnace through the control unit, and start the radar test instrument and record a test result after the temperature reaches the preset temperature; continuous heating and recording the results can obtain the continuous electromagnetic characteristic changes of the target body at high temperature.

[0023] According to the present utility model, during the test, the radar test is carried out again and the results are recorded when the rotary test bench rotates at different angles.

[0024] Compared with the prior art, the beneficial effects of the present utility model include but are not limited to the following aspects:

[0025] 1) By using an on-line high-temperature testing device for a microwave anechoic chamber of the present utility model, uniform heating and precise temperature control of the target body can be achieved during the radar testing process in the microwave anechoic chamber, and the electromagnetic characteristics of the target body at high temperature can be obtained.

[0026] 2) By using an on-line high-temperature testing device for a microwave anechoic chamber of the present utility model, programmed heating of the target body can be maintained throughout the entire microwave anechoic chamber testing process, full-cycle radar testing of the target body at high heat state can be realized, and the coupling relationship between the temperature and electromagnetic characteristics of the target body can be obtained.

[0027] 3) By using an on-line high-temperature testing device for a microwave anechoic chamber of the present utility model, the use of a wave-transparent heating device and a polyurethane absorbing pyramid screen does not affect the measurement accuracy of the testing system, and the measurement results are reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of an on-line high-temperature testing device for a microwave anechoic chamber of the present utility model;

[0029] Figure 2 is a schematic diagram of a wave-transparent heating furnace;

[0030] Figure 3 is a sectional view of the wave-transparent heating furnace;

[0031] Figure 4 is a schematic diagram of the testing process of an on-line high-temperature testing device for a microwave anechoic chamber of the present utility model.

[0032] In the figure: 1. Microwave anechoic chamber; 2. Wave-transparent heating furnace; 201. Furnace cover; 2011. Hoisting ring; 2012. High-temperature resistant sealing silica gel gasket; 202. Furnace wall; 2021. Heat wave-transparent ceramic; 2022. Self-heating wave-transparent mengene quartz fiber fabric; 2023. Wire electrode; 203. Furnace bottom; 204. Heat insulation layer; 3. Hoisting device; 4. Movable opening; 5. Gantry; 6. Polyurethane absorbing pyramid; 7. Compact range; 8. Radar testing instrument; 9. Feeder; 10. Absorbing screen; 11. Control unit; 12. Rotary test bench; 13. Target body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The following further describes the present utility model in detail with specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model.

[0034] The present utility model discloses an on-line high-temperature testing device for a microwave anechoic chamber, as Figure 1As shown in the figure, it includes an anechoic chamber 1, a wave-transmitting heating furnace 2, a gantry 5, a rotary test bench 12, and a control unit 11; the anechoic chamber 1 is provided with polyurethane absorbing pyramids 6, a feed source 9, a compact range 7, and a radar test instrument 8; the radar test instrument 8 is used to complete the radar test procedure after the target 13 is heated up; the wave-transmitting heating furnace 2 is used for the on-line heating and heat preservation of the target 13; the gantry 5 is used for lifting and covering the furnace cover 201 of the wave-transmitting heating furnace; the rotary test bench 12 is used to carry and rotate the wave-transmitting heating furnace 2 and the target 13 inside it; the control unit 11 is used to control the operation of the wave-transmitting heating furnace 2, the rotary test bench 12, and the gantry 5.

[0035] The support of the gantry 5 spans across the outside of the anechoic chamber 1. The top of the anechoic chamber 1 is provided with a movable opening 4 for the operation of the lifting device of the gantry 5. When the movable opening 4 is opened, the lifting device 3 enters the anechoic chamber 1 to lift and cover the furnace cover 201 of the wave-transmitting heating furnace to realize the loading and unloading of the target 13. When the lifting device 3 leaves the anechoic chamber 1, the movable opening 4 is closed; the polyurethane absorbing pyramids 6 are attached to the inner wall of the anechoic chamber 1; the compact range 7, the feed source 9, and the rotary test bench 12 are arranged longitudinally in the anechoic chamber 1 in sequence. The wave-transmitting heating furnace 2 is installed on the rotary test bench 12, and a polyurethane absorbing pyramid screen 10 is provided between the rotary test bench 12 and the feed source 9 for electromagnetic protection to avoid affecting the measurement accuracy of the test system by the rotary test bench 12; the control unit 11 and the radar test instrument 8 are placed outside the anechoic chamber 1 and are connected to the internal mechanisms of the chamber 1 through wires.

[0036] The wave-transmitting heating furnace 2 is made of a composite material of a heat wave-transmitting ceramic 2021 and a self-heating wave-transmitting mengene quartz fiber fabric 2022. As Figures 2 - 3 shown, the self-heating wave-transmitting mengene quartz fiber fabric 2022 is embedded in the central position inside the heat wave-transmitting ceramic 2021 to prepare a composite material of a heat wave-transmitting ceramic / self-heating wave-transmitting mengene quartz fiber fabric "sandwich" structure; if the self-heating wave-transmitting mengene quartz fiber fabric 2022 is biased towards the inner or outer side of the furnace wall 202, it will affect the heat transfer efficiency and structural strength; the heat wave-transmitting ceramic 2021 also plays a role in isolating air to prevent graphene from oxidizing when exposed to air at a high temperature.

[0037] The heat wave-transmitting ceramic 2021 is one or more composite ceramics of alumina ceramic, quartz ceramic, silicon nitride ceramic, silicon carbide ceramic, and zirconia ceramic. The forming methods that can be used are one or more of dry pressing, cold isostatic pressing, slip casting, gel casting, and hot die casting. Preferably, a heat wave-transmitting quartz ceramic is processed and formed by the slip casting method, which is convenient for producing large-sized structural parts.

[0038] The self-heating wave-transparent mengene quartz fiber fabric 2022 is a graphene / quartz fiber composite material. By using the method of high-temperature chemical vapor deposition, a continuous graphene film is grown on the surface of traditional glass fibers, which has the characteristics of wave transmission, high conductivity, high thermal conductivity, and high infrared emissivity, and can achieve continuously adjustable surface resistance in the range of 30-5000 Ω / sq. Preferably, the mengene quartz fiber fabric 2022 with a surface resistance of 3000 Ω / sq is selected, which has both high wave transmission and high heat generation.

[0039] The dielectric constant and dielectric loss of the heat wave-transparent ceramic 2021 material are low, and the wave transmission rate is higher than 85%. It can withstand high temperatures above 1000 °C. If the wave transmission rate of the heat wave-transparent ceramic 2021 material is lower than 85%, it will affect the test accuracy. If the temperature resistance is lower than 1000 °C, it cannot meet the usage requirements.

[0040] The dielectric constant and dielectric loss of the self-heating wave-transparent mengene quartz fiber fabric 2022 are low, the wave transmission rate is higher than 85%, it has high strength, good flexibility, good self-heating uniformity, fast heating rate, and good cycle stability. If the wave transmission rate of the mengene quartz fiber fabric 2022 is lower than 85%, it will affect the test accuracy.

[0041] According to the present utility model, the thickness of the mengene quartz fiber fabric 2022 is 1-5 mm. If the thickness is less than 1 mm, the strength is insufficient and the heat generation is insufficient, which cannot meet the usage requirements. If the thickness is greater than 5 mm, it is difficult to produce and manufacture, and it will reduce the strength of the "sandwich" structure of the heat wave-transparent ceramic 2021 / mengene quartz fiber fabric 2022. Preferably, the mengene quartz fiber fabric 2022 with a thickness of 3 mm is selected.

[0042] According to the present utility model, the surface of the mengene quartz fiber fabric 2022 is penetrated by a "U"-shaped conductive electrode 2023. When powered on, it can self-heat, and the temperature can be controlled by adjusting the voltage. The heating temperature can reach 800 °C, and the temperature control accuracy can reach ±1 °C.

[0043] The outside of the whole wave-transparent heating furnace 2 is wrapped with asbestos, ceramic fiber cotton or wave-transparent heat insulation tiles in a conforming manner to form a heat insulation layer 204, which plays a role in protection and heat preservation, and improves safety and energy utilization efficiency. Preferably, 99 alumina ceramic fiber cotton is used as the heat insulation layer 204, which has excellent heat insulation effect and good economy.

[0044] The whole wave-transparent heating furnace 2 presents a "tea cup"-shaped cylindrical structure. The furnace bottom 203 and the furnace wall 202 are integrated, and the furnace cover 201 is a split type. A groove is processed on the inner side of the furnace cover 201, and a high-temperature resistant sealing silica gel gasket 2012 is arranged in the groove to form an assembly with the furnace body. A lifting ring 2011 is arranged on the top of the furnace cover 201 to cooperate with the gantry 5 for lifting; the whole wave-transparent heating furnace 2 has good sealing and heat preservation performance, and the wave transmission rate is above 85%.

[0045] According to the present utility model, the inner diameter of the wave-transmitting heating furnace 2 is 300 - 700 mm, the height of the furnace body is 250 - 600 mm, and the wall thickness of the furnace body is 15 - 30 mm. If the inner diameter of the furnace body is less than 300 mm, most of the target bodies cannot be accommodated. If the inner diameter of the furnace body is greater than 700 mm, the forming difficulty is too high. If the height of the furnace body is less than 250 mm, it is not enough to accommodate the target body. If the height of the furnace body is greater than 600 mm, it cannot be formed. If the wall thickness is less than 15 mm, the strength is insufficient. If the wall thickness is greater than 30 mm, the mass is too large. Preferably, the inner diameter of the furnace body is 500 mm, the height of the furnace body is 500 mm, and the wall thickness of the furnace body is 20 mm, which can meet the test requirements of most target body samples.

[0046] When the wave-transmitting heating furnace 2 is powered on, the furnace body rapidly heats up and heats the internal target body 13 through thermal radiation, and programmed heating and heat preservation of the target body 13 can be maintained during the entire radar test process.

[0047] The radar test instrument 8 starts the feed source 9 to emit a spherical wave, which is converted into a pseudo-plane wave by the compact range 7. The pseudo-plane wave passes through the wave-transmitting heating furnace 2 and reaches the high-temperature target body 13. The electromagnetic wave reflected by the high-temperature target body 13 returns to the radar test instrument 8 through the compact range 7 and the feed source 9 in turn. The radar test instrument 8 receives the echo and analyzes and calculates to obtain the electromagnetic characteristics of the target body 13.

[0048] The control unit 11 is used as a total control device to control the lifting and covering of the gantry 5, the heating temperature and heating speed of the wave-transmitting heating furnace 2, the rotation angle and rotation speed of the rotary test bench 12, and the operation of each device.

[0049] The polyurethane absorbing pyramids 6 are made of solid polyurethane pyramidal absorbing materials, with a pyramidal surface, can withstand high temperatures, and are not easily deformed or melted. The polyurethane absorbing pyramids 6 are covered on the inner wall of the microwave anechoic chamber 1 to resist electromagnetic interference, suppress clutter in communication and radar systems, etc. When made into an absorbing screen 10, it can protect the rotary test bench 12 in the test environment, effectively reduce the background noise, eliminate clutter interference, and improve the test accuracy.

[0050] A test method for the microwave anechoic chamber on-line high-temperature test device of the present utility model uses the above-mentioned microwave anechoic chamber on-line high-temperature test system, and the steps are as follows: At the beginning of the test, as Figure 1 shown, open the movable opening 4 at the top of the microwave anechoic chamber 1, the lifting device 3 of the gantry 5 enters the microwave anechoic chamber 1 to lift the furnace cover 201, place the target body 13 in the wave-transmitting heating furnace 2, and the lifting device 3 closes the furnace cover 201 and leaves the microwave anechoic chamber 1; close the opening 4 of the microwave anechoic chamber as Figure 2 shown, energize and heat the wave-transmitting heating furnace 2 through the control unit 11. After the temperature reaches the preset temperature, turn on the radar test instrument 8 and record a test result; continuous heating and recording the results can obtain the continuous electromagnetic characteristic changes of the target body 13 at high temperatures.

[0051] During the test, when the rotary test bench 12 rotates at different angles, radar tests are carried out again and the results are recorded.

[0052] Embodiment 1

[0053] A test method for an on-line high-temperature test device in a microwave anechoic chamber. The system is set as above, and the specific method is as follows:

[0054] 1) Preparation before testing. Turn on the on-line high-temperature test system. Use the radar test instrument 8 to set various radar test parameters, and use the control unit 11 to set the heating temperature of the wave-transparent heating furnace 2.

[0055] 2) Open the movable opening 4 of the microwave anechoic chamber 1. Use the control unit 11 to control the lifting device 3 to slowly enter the microwave anechoic chamber 1 through the movable opening 4 and reach the position of the wave-transparent heating furnace 2. After docking with the lifting ring 2011, slowly lift and open the furnace cover 201; put the target body 13 into the wave-transparent heating furnace 2. Use the control unit 11 to control the lifting device 3 to slowly lower and close the furnace cover 201, then release the lifting ring 2011, and then slowly leave the microwave anechoic chamber 1 through the movable opening 4 again, and close the movable opening 4.

[0056] 3) Use the control unit 11 to start the wave-transparent heating furnace 2 to start heating up and heat the target body 13 at the same time. After the temperature reaches the set temperature, keep it.

[0057] 4) Start the radar test program and record the electromagnetic waves reflected by the target body 13.

[0058] 5) Turn off the power supply of the wave-transparent heating furnace 2. When the wave-transparent heating furnace 2 and the target body 13 cool down to room temperature, repeat step 2, take out the target body 13, and the test is over.

[0059] Before the test, a wave-transparent heating furnace without electrodes can be made in advance as a comparison furnace. Before the preparation stage, the wave-transparent characteristics of the two furnaces are tested separately without heating and without placing the target body. The measured parameters are used to correct the influence brought by the electrodes after the temperature rise test. It is also possible to perform a test on the heating furnace according to the above 5 steps without placing the target part, which is used to correct the influence of the change in the wave-transparency of the furnace itself after heating on the test results of the target part.

[0060] Embodiment 2

[0061] An on-line high-temperature test device in a microwave anechoic chamber. The system is set as above, and the specific test method is as follows:

[0062] 1) Preparation before testing. Turn on the on-line high-temperature test system. Use the radar test instrument 8 to set various radar test parameters, use the control unit 11 to set the heating temperature gradient of the wave-transparent heating furnace 2, and use the control unit 11 to set the rotation parameters of the rotary test bench 12.

[0063] 2) Open the movable opening 4 of the anechoic chamber 1. Use the control unit 11 to control the hoisting device 3 to slowly enter the anechoic chamber 1 through the movable opening 4 and reach the position of the wave-transparent heating furnace 2. After docking with the lifting ring 2011, slowly hoist and open the furnace cover 201; place the target body 13 into the wave-transparent heating furnace 2. Use the control unit 11 to control the hoisting device 3 to slowly lower and close the furnace cover 201, then release the lifting ring 2011, and then slowly leave the anechoic chamber 1 through the movable opening 4 again, and close the movable opening 4.

[0064] 3) Use the control unit 11 to start the wave-transparent heating furnace 2 to heat the target body 13 to temperature one.

[0065] 4) Maintain the temperature, start the radar test program, and record the electromagnetic waves reflected by the target body 13. Use the control unit 11 to control the rotation of the rotary test bench 12. The rotary test bench 12 records data every time it rotates an angle until it rotates to the termination angle.

[0066] 5) Use the control unit 11 to increase the voltage to accurately raise the temperature of the wave-transparent heating furnace 2 to temperature two, and repeat step 4.

[0067] 6) Repeat step 5 until the test of the termination temperature is completed.

[0068] 7) Turn off the power supply of the wave-transparent heating furnace 2. When the wave-transparent heating furnace 2 and the target body 13 cool down to room temperature, repeat step 2, take out the target body 13, and the test ends.

Claims

1. A microwave darkroom online high temperature test device, characterized in that: It comprises a microwave darkroom, a wave-transmitting heating furnace, a gantry, a rotating test bench and a control unit; the microwave darkroom is provided with a polyurethane wave-absorbing cone, a feed source, a compact field and a radar test instrument; the radar test instrument is used to complete the radar test procedure after the temperature of the target body is raised; the wave-transmitting heating furnace is used for online heating and heat preservation of the target body; the gantry is used for lifting and closing the cover of the wave-transmitting heating furnace; the rotating test bench is used for carrying and rotating the wave-transmitting heating furnace and the target body inside it; the control unit is used to control the operation of the wave-transmitting heating furnace, the rotating test bench and the gantry.

2. The microwave darkroom online high temperature testing device according to claim 1, characterized in that: The support of the gantry spans the outside of the microwave darkroom. A movable opening is provided on the top of the microwave darkroom for the operation of the gantry lifting device. When the movable opening is opened, the lifting device enters the microwave chamber to lift and close the furnace cover of the wave-transmitting heating furnace to achieve the removal and placement of the target object. When the lifting device leaves the microwave darkroom, the movable opening is closed; the polyurethane absorbing angle cone is attached to the inner wall of the microwave darkroom; the compression field, feed source, and rotating test bench are arranged longitudinally in the microwave darkroom in sequence, the wave-transmitting heating furnace is installed on the rotating test bench, and a polyurethane absorbing angle cone screen is provided between the rotating test bench and the feed source for electromagnetic protection to prevent the rotating test bench from affecting the measurement accuracy of the test system; the control unit and the radar test instrument are placed outside the microwave darkroom and connected to the mechanism in the darkroom through lines.

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