Ultrahigh-temperature heating furnace and system and method for testing ultrahigh-temperature normal spectral emissivity of material

Abstract

The invention belongs to the technical field of material emissivity measurement, and discloses an ultra-high-temperature heating furnace and a material ultra-high-temperature normal spectral emissivity testing system and method. The system for testing the ultrahigh-temperature normal spectral emissivity of the material comprises a normal thermal radiation signal acquisition and processing system, a light path system, a standard black body, an ultrahigh-temperature heating furnace, a two-color colorimeter, a water cooling machine and an inert gas protection system, according to the invention, normal thermal radiation signals of a material sample and a black body can be accurately guided, the high-temperature spectral emissivity test precision is greatly improved, measurement errors caused by non-uniform temperature are avoided by ensuring uniform surface temperature of the sample, high-precision and high-stability ultra-high-temperature normal spectral emissivity measurement is realized, and the measurement accuracy is improved. The application bottleneck of the prior art is broken through, and a more accurate and reliable test means is provided for scientific research of materials.

Description

Technical Field

[0001] The present invention relates to the technical field of material emissivity measurement, and in particular to an ultra-high temperature heating furnace, a material ultra-high temperature normal spectral emissivity testing system and method. Background Art

[0002] High-precision measurement technology for normal spectral emissivity has critical applications in numerous cutting-edge scientific and industrial fields, particularly in the evaluation of material performance under ultra-high temperature conditions, which is directly related to equipment reliability, energy efficiency, and technological innovation capabilities. For example, in aerospace, hypersonic vehicle thermal protection systems rely on precise emissivity data for high-temperature composite materials in ultra-high temperatures, up to 2000°C, to optimize thermal insulation design and enhance their thermal stealth performance. In the energy sector, the development of high-temperature spectral emissivity measurement methods can effectively improve the design efficiency of solar spectrally selective materials and gas turbine blades.

[0003] However, existing technologies still have significant limitations in measuring normal spectral emissivity in ultra-high temperature environments. Specifically, the following are the limitations: First, the insufficient heating means of existing measurement systems limit the temperature range. In existing technologies, patents CN102928343A and CN102042993A both heat samples through thermal radiation. The upper temperature limit is limited by the temperature resistance of the heating elements (silicon-molybdenum rods and silicon-carbon rods), resulting in the measurement temperature being concentrated below 1600°C. In addition, the heating chamber is a vacuum chamber, which increases the system complexity and cost. Second, the ultra-high temperature spectral emissivity measurement process has large errors. In existing technologies, background radiation interference and non-uniform sample surface temperature are the main sources of error. When electric heating methods such as tubular heating furnaces are used, in order to further increase the sample surface temperature, the sample needs to be placed inside the heating furnace, resulting in large errors in the spectral emissivity measurement due to cavity radiation reflection at high temperatures. When irradiation heating methods such as laser heating are used, the sample surface temperature gradient is large.

[0004] In response to the above problems, it is urgent to develop an experimental test system for normal spectral emissivity in ultra-high temperature environments. Summary of the Invention

[0005] The purpose of the present invention is to provide an ultra-high temperature heating furnace, a material ultra-high temperature normal spectral emissivity testing system and method to overcome the problems existing in the prior art. The present invention adopts a high-power heating furnace, through optical path design, sample heating bracket design, cooling and inert gas protection system, and based on the energy comparison method, by measuring the normal thermal radiation signal of the material to be tested and the normal thermal radiation signal of a standard black body at the same temperature, and comparing the two to obtain the spectral emissivity of the material sample. The present invention can achieve high-precision and high-stability ultra-high temperature normal spectral emissivity measurement, breaking through the application bottleneck of the prior art.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides an ultra-high temperature heating furnace, comprising a chassis, a control system integrated inside the chassis, a control panel system installed on the side of the chassis, a heating device installed on the top of the chassis, and the control system connected to the control panel system and the heating device respectively; The heating device includes a graphite heating tube, a first water-cooled plate is installed at one end of the graphite heating tube, and a second water-cooled plate is installed at the other end. An anti-oxidation system is also installed on the graphite heating tube, and one side of the first water-cooled plate and the second water-cooled plate are respectively connected to an external water cooler through a water inlet pipe and a water outlet pipe, and are also connected to an external inert gas system through an inert gas pipe. Graphite electrodes are provided at both ends of the graphite heating tube, and the graphite electrodes are respectively clamped inside the first water-cooled plate and the second water-cooled plate for heating the graphite heating tube. The outer circumference of the graphite heating tube is covered with a composite thermal insulation structure, and the composite thermal insulation structure is located between the first water-cooled plate and the second water-cooled plate. An infrared temperature measurement system is provided on the side of the second water-cooled plate away from the first water-cooled plate; A baffle is installed inside the graphite heating tube, and a graphite fixture is installed on the side of the baffle close to the second water cooling plate; Furthermore, the anti-oxidation system includes a potassium bromide window, a central perforation, and an inert gas distributor; The potassium bromide window is installed at one end of the graphite heating tube near the second water-cooling plate, the graphite electrode is located between the potassium bromide window and one end of the graphite heating tube near the second water-cooling plate, and the potassium bromide window is connected to the inner cavity of the graphite heating tube; The middle punched hole is located on the graphite heating tube between the baffle and the graphite fixture; The inert gas distributor is arranged in a ring outside the potassium bromide window; Furthermore, the composite insulation structure includes a quartz glass cover, carbon paper and glass fiber insulation wool in sequence from farthest from the graphite heating tube to close to the graphite heating tube, and both ends of the quartz glass cover are connected to the first water cooling plate and the second water cooling plate through a sealing ring; Furthermore, one end of the water inlet cooling pipe and the water outlet cooling pipe is connected to one side of the first water cooling plate and the second water cooling plate, and the other end of the water inlet cooling pipe and the water outlet cooling pipe enters the interior of the chassis from the top of the chassis and is then connected to the external water cooler; One end of the inert gas pipeline is connected to one side of the first water-cooling plate and the second water-cooling plate, and the other end of the inert gas pipeline enters the interior of the chassis from the top of the chassis and is then connected to the external inert gas system; Furthermore, the infrared temperature measurement system includes a pressing device, an infrared opening observation window and an infrared thermometer; The clamping device is installed on a side of the first water-cooling plate away from the second water-cooling plate, and an opening is provided on the side of the clamping device away from the first water-cooling plate to form an infrared opening observation window. The infrared thermometer is installed on a side of the infrared opening observation window away from the clamping device, and the infrared thermometer is coaxially arranged with the graphite heating tube; Furthermore, the control system includes a power supply, a temperature control circuit, a PID control unit and a transformer; The power supply is connected to the PID control unit, the transformer, the control panel system, the infrared thermometer and the graphite electrode respectively through the temperature control circuit; Furthermore, the control panel system includes an emergency start / stop button, and also includes a temperature setting panel located on top of the emergency start / stop button, an alarm indicator light, a heating furnace input power display panel, a cooling water temperature display panel, a power switch and a gas flow control button.

[0007] In a second aspect, the present invention provides a material ultra-high temperature normal spectral emissivity testing system, comprising: A normal thermal radiation signal acquisition and processing system includes a spectrometer disposed at the entrance of an external light source, which is used to cooperate with the optical path system to acquire normal thermal radiation signals of material samples and black bodies. The spectrometer is connected to a computer system for processing and storing normal thermal radiation signals and measurement results of material samples and black bodies at different temperatures; an optical path system, comprising a gold-coated plane mirror, an aperture, and an off-axis parabolic mirror, for allowing normal thermal radiation signals of the material sample and the black body to be collected by the spectrometer, and for allowing normal thermal radiation signals of the material sample and the black body to be collected by the two-color colorimeter; A standard blackbody is equipped with a heating tube inside to provide the normal thermal radiation signal of the blackbody. It is symmetrically arranged on both sides of the off-axis parabolic mirror with the ultra-high temperature heating furnace and is located at the focal length of the off-axis parabolic mirror to ensure the consistency of the optical path. The ultra-high temperature heating furnace is used to provide the normal thermal radiation signal of the material sample. It is symmetrically arranged on both sides of the off-axis parabolic mirror with the standard black body and is located at the focal length of the off-axis parabolic mirror to ensure the consistency of the optical path. A two-color colorimeter is provided at one end of the optical path system, at the end of the off-axis parabolic mirror away from the aperture, and is used to receive normal thermal radiation signals of the black body and the material sample and measure the surface temperature of the black body and the material sample; A water cooler is connected to the ultra-high temperature heating furnace and is used to provide cold water for cooling the ultra-high temperature heating furnace; An inert gas protection system is connected to the ultra-high temperature heating furnace and is used to provide inert gas protection for the ultra-high temperature heating furnace; Furthermore, a laser is installed inside the spectrometer for optical path calibration. The spectrometer is provided with an external optical path channel. The optical path system is located on the external optical path channel and is used to allow the normal thermal radiation signals of the material sample and the black body to enter the interior of the spectrometer.

[0008] In a third aspect, the present invention provides a method for testing the ultra-high temperature normal spectral emissivity of a material, comprising the following steps: Step 1: Turn on the water chiller and inert gas protection system, then turn on and set the standard blackbody to the blackbody test temperature; Step 2: Adjust the optical system so that the blackbody normal thermal radiation signal of the standard blackbody is collected by the two-color colorimeter, and the two-color colorimeter converts the collected blackbody normal thermal radiation signal into a blackbody temperature signal; Step 3: When the blackbody temperature signal displayed by the two-color colorimeter reaches the blackbody temperature to be measured, the off-axis parabolic mirror is adjusted so that the blackbody normal thermal radiation signal of the standard blackbody is reflected by the off-axis parabolic mirror, then passes through the aperture, and then is reflected by the gold-coated plane mirror into the interior of the spectrometer, so that the blackbody normal thermal radiation signal is collected by the spectrometer, and the spectrometer transmits the collected blackbody normal thermal radiation signal to the computer system; Step 4: Adjust the optical path system, turn on the ultra-high temperature heating furnace and set it to the material temperature to be measured, so that the normal thermal radiation signal of the material sample in the ultra-high temperature heating furnace is collected by the two-color colorimeter, and the two-color colorimeter converts the collected normal thermal radiation signal of the material sample into a material sample temperature signal; Step 5: When the material sample temperature signal displayed by the two-color colorimeter reaches the material temperature to be measured, the off-axis parabolic mirror is adjusted so that the normal thermal radiation signal of the material sample in the ultra-high temperature heating furnace is reflected by the off-axis parabolic mirror, then passes through the aperture, and then is reflected by the gold-coated plane mirror into the interior of the spectrometer, so that the normal thermal radiation signal of the material sample is collected by the spectrometer, and the spectrometer transmits the collected normal thermal radiation signal of the material sample to the computer system; Step six, calculating the spectral emissivity of the material sample based on the normal thermal radiation signal of the blackbody and the normal thermal radiation signal of the material sample through a computer system.

[0009] The above technical solution has the following advantages or beneficial effects: First, the present invention provides an ultra-high temperature heating furnace. By adopting high-power graphite heating and coordinating with an annular composite insulation structure, heat loss is effectively reduced, so that the maximum heating temperature of the heating furnace can reach 2500°C, which can meet many experimental or production scenarios with strict requirements on high-temperature environments; at the same time, the addition of water-cooling pipes and water coolers can reduce the temperature of the external structure during high-temperature operation, ensure the stability of heating, and provide reliable protection for the heating process; the addition of inert gas pipes and inert gas systems not only ensures the stability of material samples during high-temperature heating, but also greatly reduces the risk of sample oxidation, thereby improving the success rate of experiments or production and product quality; overall, the ultra-high temperature heating furnace of the present invention exhibits excellent performance in the field of high-temperature heating, provides related industries with efficient and reliable heating solutions, and has extremely high practical value.

[0010] Furthermore, an inert gas distributor is arranged in a ring outside the potassium bromide window, which can evenly and stably transport the inert gas into the heating tube, purge the inside of the graphite heating tube, and ensure the uniformity of the inert gas distribution; the potassium bromide window can avoid the influence of external airflow on the inert gas atmosphere inside the graphite heating tube, thereby ensuring the stability of heating.

[0011] Furthermore, quartz glass cover, carbon paper and glass fiber insulation cotton are arranged in sequence from farthest to closer to the graphite heating tube. The multi-layer combination insulation method can give full play to the advantages of each material and achieve efficient thermal insulation; the quartz glass cover has good high temperature resistance and chemical stability, can maintain structural integrity in a high temperature environment, and provide protection for the internal insulation material. At the same time, its transparent property facilitates observation of the heating process; carbon paper has excellent thermal conductivity uniformity and certain thermal insulation capacity, which can make the heat evenly distributed around the heating tube, reduce local overheating, and further improve the uniformity of heating; glass fiber insulation cotton has excellent thermal insulation performance, which can effectively prevent heat from dissipating outward and reduce energy consumption; the composite insulation structure not only improves the heating efficiency of the heating furnace, makes the heat more concentrated on the material sample, but also reduces energy consumption and reduces the impact on the surrounding environment, while ensuring the stability and safety of the heating process, providing strong support for the reliable operation of the ultra-high temperature heating furnace.

[0012] Furthermore, in terms of cooling, one end of the water inlet and outlet pipes is connected to the first and second water-cooled plates, and the other end enters the interior from the top of the chassis and is connected to the external water cooler, so that the cooling water circulation path is clear and reasonable, which can efficiently take away the heat absorbed by the water-cooled plates, effectively reduce the temperature of the water-cooled plates and surrounding components, and prevent damage to the equipment due to high temperature; in terms of inert gas supply, the inert gas pipe also enters the interior from the top of the chassis and is connected to the external inert gas system, ensuring that the inert gas can be stably and smoothly transported to the water-cooled plates, thereby creating a good inert atmosphere inside the heating furnace, effectively preventing the material samples from being oxidized at high temperatures, and providing a strong guarantee for the efficient and stable operation of the heating furnace.

[0013] Furthermore, the clamping device is installed on the side of the first water-cooling plate away from the second water-cooling plate, providing a solid installation foundation for the entire temperature measurement system, ensuring the stability of the system during the temperature measurement process, and reducing measurement errors caused by factors such as vibration; a hole is opened on the clamping device to form an infrared opening observation window, providing a clear observation channel for the infrared thermometer, so that the infrared thermometer can accurately capture the temperature information in the graphite heating tube; the infrared thermometer and the graphite heating tube are coaxially arranged, which greatly improves the accuracy of temperature measurement. The coaxial arrangement ensures that the measuring direction of the infrared thermometer is consistent with the axis of the heating tube, and can directly measure the temperature of the material sample in the heating tube, avoiding measurement deviation caused by angle deviation.

[0014] Furthermore, from the perspective of temperature measurement accuracy, the infrared thermometer is linked with the temperature control circuit to achieve accurate measurement of the temperature of the graphite heating tube, with the deviation between the actual temperature and the set temperature being ≤1°C; in terms of temperature control, the control panel system can conveniently set the temperature and heat the graphite heating tube through the graphite electrode; the PID control unit adjusts the power according to the difference between the actual temperature and the set temperature to achieve a stable and controllable heating process until the measured temperature of the furnace cavity is consistent with the set temperature, thereby achieving accurate measurement and stable control of the temperature of the ultra-high temperature heating furnace.

[0015] Furthermore, the temperature setting panel is used to control the heating temperature of the graphite heating tube by the graphite electrode to achieve controllable heating of the material sample. The temperature setting panel can also display the set temperature and the actual temperature in the furnace in real time; the alarm indicator light is used when cooling water or inert gas is not passed, and the corresponding indicator light flashes and alarms; the heating furnace input power display panel is used to monitor whether the high-temperature furnace input power is normal; the cooling water temperature display panel is used to monitor whether the outlet cooling water temperature is too high; the emergency start and stop button adopts a press-button design, which is used to quickly press the button to turn off the power when an accident occurs; the gas flow control button is used to control the flow rate of the inert gas, and is displayed through the display panel, which improves the timeliness and safety of the use of the heating furnace.

[0016] Secondly, the present invention provides a material ultra-high temperature normal spectral emissivity test system. In terms of optical path design, a combination of a plane mirror, an aperture, and an off-axis parabolic mirror is used to accurately guide the normal thermal radiation signal of the material sample and the black body, effectively reducing the interference of the black body effect of the front end wall of the heating tube, ensuring that the collected signal is accurate and reliable, and greatly improving the accuracy of the high-temperature spectral emissivity test; in terms of sample heating bracket design, the use of an annular sample graphite fixture and a front water cooling plate ensures that the surface temperature of the sample is uniform. The uniform temperature distribution makes the measurement results more representative and accurate, avoiding the problem of temperature fluctuations caused by temperature fluctuations. At the same time, the system is equipped with a high-power heating furnace, combined with a cooling and inert gas protection system, to provide a stable environment for testing. The water cooler cools the ultra-high temperature heating furnace to ensure stable operation of the equipment. The inert gas protection system prevents sample oxidation and ensures stable test conditions. Overall, the test system achieves high-precision and high-stability ultra-high temperature normal spectral emissivity measurement through the synergy of optical path design, sample heating bracket design, and cooling and inert gas protection systems, breaking through the application bottleneck of existing technologies and providing a more accurate and reliable testing method for materials science research.

[0017] Furthermore, a laser is installed inside the spectrometer for optical path calibration, which can ensure the accuracy of the optical path system, reduce measurement errors caused by optical path deviation, and improve the reliability of test results. Laser calibration can quickly and accurately locate the optical path, allowing the spectrometer to accurately receive signals; the spectrometer is equipped with an external optical path channel, and the optical path system is located on it, so that the normal thermal radiation signals of the material sample and the black body can smoothly enter the spectrometer, which not only optimizes the signal transmission path, but also ensures the integrity and accuracy of the signal, providing a high-quality data basis for subsequent signal processing and analysis, and helping to improve the performance and measurement accuracy of the entire test system.

[0018] Thirdly, the present invention provides a method for testing the ultra-high temperature normal spectral emissivity of materials. In terms of test accuracy, by rotating the off-axis parabolic mirror, the normal thermal radiation of the standard black body and the sample at the same temperature can accurately enter the spectrometer. The calculation is based on the energy comparison method, which effectively reduces the interference of external factors, greatly improves the measurement accuracy of the high-temperature spectral emissivity of the material, and provides reliable data for material performance research; in terms of test range, a wide temperature range test of 250-2500°C can be achieved, which can meet the emissivity measurement needs of different materials in high temperature environments, broaden the applicable scenarios of the test method, and provide strong support for the research of materials science in the high temperature field; in terms of heating performance, a high-power sample heating furnace is used to achieve uniform heating of the material in a wide temperature range, ensure uniform surface temperature of the sample, avoid measurement errors caused by uneven temperature, and further improve the reliability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of an ultra-high temperature heating furnace according to the present invention; Figure 2 This is a schematic diagram of the partial structure of a heating device of an ultra-high temperature heating furnace of the present invention; Figure 3 This is a structural schematic diagram of a material ultra-high temperature normal spectral emissivity testing system according to the present invention; In the figure, 1. Spectrometer; 2. Gold-coated plane mirror; 3. Computer system; 4. Aperture; 5. Ultra-high temperature heating furnace; 6. Off-axis parabolic mirror; 7. Two-color colorimeter; 8. Water chiller; 9. Inert gas protection system; 10. Standard black body; 501. Chassis; 5011. Lockable universal wheel; 5012. Buckle; 5013. Mounting frame; 5014. Support rod; 5015. Support plate; 502. Composite insulation structure; 5021. Quartz glass cover; 5022. Carbon paper; 5023. Glass fiber insulation cotton; 503. Graphite heating tube; 5031. Baffle; 5032. Graphite fixture; 5033. Stone Ink electrode; 504, infrared thermometer; 5041, infrared opening observation window; 505, first water-cooling plate; 5051, pressing device; 5052, water-cooling inlet pipe; 5053, second water-cooling plate; 5054, inert gas pipe; 5055, water-cooling outlet pipe; 506, potassium bromide window; 5061, middle punching; 5062, inert gas distributor; 507, emergency start-stop button; 5071, temperature setting panel; 5072, alarm indicator light; 5073, heating furnace input power display panel; 5074, cooling water temperature display panel; 5075, power switch; 5076, gas flow control button. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to specific embodiments, which are intended to explain the present invention rather than to limit it. In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention. It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] Example: See also Figure 1 The present invention provides an ultra-high temperature heating furnace, comprising a chassis 501, a control system, a control panel system and a heating device; the control system comprises a power supply, a temperature control circuit, a PID control unit and a transformer; the control panel system comprises an emergency start / stop button 507, a temperature setting panel 5071, an alarm indicator light 5072, a heating furnace input power display panel 5073, a cooling water temperature display panel 5074, a power switch 5075 and a gas flow control button 5076; the heating device comprises a graphite heating tube 503, a first water cooling plate 505, a second water cooling plate 5053, an inlet Water-cooling pipe 5052, inert gas pipe 5054, outlet water-cooling pipe 5055, anti-oxidation system, composite insulation structure 502, infrared temperature measurement system, baffle 5031, graphite fixture 5032, graphite electrode 5033; anti-oxidation system includes potassium bromide window 506, central perforation 5061, and inert gas distributor 5062; composite insulation structure 502 includes quartz glass cover 5021, carbon paper 5022, and glass fiber insulation cotton 5023; infrared temperature measurement system includes pressing device 5051, infrared opening observation window 5041, and infrared thermometer 504; The control system is integrated into the interior of the chassis 501. The control panel system is installed on the side of the chassis 501 and is used to control the heating temperature and monitor the high-temperature operation status. The heating device is installed on the top of the chassis 501. The control system is connected to the control panel system and the heating device respectively; see Figure 2A first water-cooled plate 505 is installed at one end of the graphite heating tube 503, and a second water-cooled plate 5053 is installed at the other end. An anti-oxidation system is also installed on the graphite heating tube 503. One side of the first water-cooled plate 505 and the second water-cooled plate 5053 are connected to an external water-cooled machine 8 through a water-cooled inlet pipe 5052 and a water-cooled outlet pipe 5055, respectively. One side of the first water-cooled plate 505 and the second water-cooled plate 5053 are also connected to an external inert gas system 9 through an inert gas pipe 5054. Graphite electrodes 5033 are sleeved at both ends of the graphite heating tube 503. 033 is respectively clamped inside the first water-cooled plate 505 and the second water-cooled plate 5053, and is used to heat the graphite heating tube 503. The outside of the graphite heating tube 503 is circumferentially covered with a composite thermal insulation structure 502, and the composite thermal insulation structure 502 is located between the first water-cooled plate 505 and the second water-cooled plate 5053. An infrared temperature measurement system is installed on the side of the second water-cooled plate 5053 away from the first water-cooled plate 505. A baffle 5031 is installed inside the graphite heating tube 503, and a graphite fixture 5032 is installed on the side of the baffle 5031 close to the second water-cooled plate 5053; Specifically, a potassium bromide (KBr) window 506 is installed at one end of the graphite heating tube 503 near the second water-cooled plate 5053. A graphite electrode 5033 is located between the potassium bromide window 506 and the end of the graphite heating tube 503 near the second water-cooled plate 5053. The potassium bromide window 506 is connected to the inner cavity of the graphite heating tube 503. A central hole 5061 is located on the graphite heating tube 503 between the baffle 5031 and the graphite fixture 5032 for the circulation of inert gas. An inert gas distributor 5062 is arranged around the outside of the potassium bromide window 506. Specifically, the composite insulation structure 502 includes a quartz glass cover 5021, carbon paper 5022, and glass fiber insulation cotton 5023 from farthest from the graphite heating tube 503 to close to the graphite heating tube 503. The two ends of the quartz glass cover 5021 are connected to the first water cooling plate 505 and the second water cooling plate 5053 through sealing rings. Specifically, one end of the water inlet cooling pipe 5052 and the water outlet cooling pipe 5055 is connected to one side of the first water-cooling plate 505 and the second water-cooling plate 5053, and the other end of the water inlet cooling pipe 5052 and the water outlet cooling pipe 5055 enters the interior of the chassis 501 from the top of the chassis 501 and is then connected to the external water cooler 8; one end of the inert gas pipe 5054 is connected to one side of the first water-cooling plate 505 and the second water-cooling plate 5053, and the other end of the inert gas pipe 5054 enters the interior of the chassis 501 from the top of the chassis 501 and is then connected to the external inert gas system 9; Specifically, the pressing device 5051 is installed on the side of the first water-cooling plate 505 away from the second water-cooling plate 5053. The side of the pressing device 5051 away from the first water-cooling plate 505 is provided with an opening to form an infrared opening observation window 5041. The infrared thermometer 504 is installed on the side of the infrared opening observation window 5041 away from the pressing device 5051. The infrared thermometer 504 is coaxially arranged with the graphite heating tube 503, specifically coaxially arranged with the baffle 5031 in the graphite heating tube 503 (on the same axis). The infrared thermometer 504 is used to detect the temperature of the graphite heating tube 503 in a non-contact manner; Specifically, the power supply is connected to the PID control unit, the transformer, the control panel system, the infrared thermometer 504, and the graphite electrode 5033 through the temperature control circuit. The infrared thermometer 504 measures the temperature of the graphite heating tube 503 by working in conjunction with the temperature control circuit, and the deviation between the actual temperature and the set temperature is ≤1°C. The control panel system sets the temperature, and the graphite heating tube 503 is heated through the graphite electrode 5033. The PID control unit can adjust the power to achieve stable and controllable heating until the measured temperature of the furnace chamber is consistent with the set temperature. Specifically, the temperature setting panel 5071, the alarm indicator light 5072, the heating furnace input power display panel 5073, the cooling water temperature display panel 5074, the power switch 5075 and the gas flow control button 5076 are located on the top of the emergency start / stop button 507; the emergency start / stop button 507, the temperature setting panel 5071, the alarm indicator light 5072, the heating furnace input power display panel 5073, the cooling water temperature display panel 5074, the power switch 5075 and the gas flow control button 5076 are respectively connected to the power supply; the buttons on the temperature setting panel 5071 are used to control the heating temperature of the graphite heating tube 503 by the graphite electrode 5033 , in order to achieve controllable heating of material samples, the temperature setting panel 5071 can also display the set temperature and the actual temperature in the furnace in real time; the alarm indicator light 5072 is used to flash and warn when cooling water or inert gas is not flowing; the heating furnace input power display panel 5073 is used to monitor whether the high-temperature furnace input power is normal; the cooling water temperature display panel 5074 is used to monitor whether the outlet cooling water temperature is too high; the emergency start and stop button 507 adopts a press-type design, which is used to quickly press the button to turn off the power when an accident occurs; the gas flow control button 5076 has a knob and a display panel, the knob is used to control the flow rate of the inert gas, and the display is displayed on the display panel; Preferably, a lockable universal wheel 5011 is installed at the bottom of the chassis 501 for moving the ultra-high temperature heating furnace 5 during the emissivity measurement process; Preferably, protective panels are provided on both sides of the chassis 501 adjacent to the control panel system. The protective panels are disassembled by snaps 5012 for inspecting the internal devices of the chassis 501. Preferably, the graphite electrodes 5033 are threadedly sleeved on both ends of the graphite heating tube 503 and clamped inside the first water-cooling plate 505 and the second water-cooling plate 5053 to form a detachable connection with the first water-cooling plate 505 and the second water-cooling plate 5053; Preferably, the graphite heating tube 503 is made of high-purity graphite (graphite purity 99%); Preferably, the two ends of the graphite heating tube 503 are detachably mounted on the first water-cooling plate 505 and the second water-cooling plate 5053 through slots; the two ends of the quartz glass cover 5021 are mounted on the first water-cooling plate 505 and the second water-cooling plate 5053 through slots and sealing rings; Preferably, the graphite heating tube 503 can achieve a temperature of up to 2500°C inside the tube by high-power electric heating; Preferably, the graphite fixture 5032 is annular; Preferably, the carbon paper 5022 and the glass fiber insulation cotton 5023 are slightly shorter than the quartz glass cover 5021; Preferably, an annular water cooling pipe is provided inside the first water cooling plate 505 and the second water cooling plate 5053 for reducing the temperature of the graphite heating tube 503. The annular water cooling pipe is respectively connected to the water cooling inlet pipe 5052 and the water cooling outlet pipe 5055 for circulating water cooling, thereby reducing the temperature at both ends of the graphite heating tube 503 and reducing the influence of the blackbody effect on the emissivity during the emissivity measurement process. Preferably, the water inlet cooling pipe 5052, the water outlet cooling pipe 5055, and the gas pipe 5054 connected to the side of the first water-cooling plate 505 and the water inlet cooling pipe 5052, the water outlet cooling pipe 5055, and the gas pipe 5054 connected to the side of the second water-cooling plate 5053 can be located on the same side or on different sides; Preferably, mounting brackets 5013 are respectively installed at the bottom of the first water-cooling plate 505 and the second water-cooling plate 5053, the infrared thermometer 504 is installed on the support plate 5015, and the bottom of the support plate 5015 is also provided with a mounting bracket 5013, and a support rod 5014 is coaxially provided on the three mounting brackets 5013; Preferably, the inert gas system 9 outputs inert gas, which enters the first water-cooled plate 505 and the second water-cooled plate 5053 respectively through the inert gas pipeline 5054, then enters the interior of the graphite heating tube 503, and purges the surface of the material sample through the central hole 5061 set on the graphite heating tube 503; enters the inert gas distributor 5062 through the second water-cooled plate 5053, and purges the interior of the graphite heating tube 503 through the inert gas distributor 5062; Preferably, the inert gas distributor 5062 is annular, and the detachable ring is arranged outside the potassium bromide window 506. The diameter of the potassium bromide window 506 matches the inner diameter of the inert gas distributor 5062, with a clearance of 0.5-1 mm. The potassium bromide window 506 can prevent the external airflow from affecting the inert gas atmosphere inside the graphite heating tube 503. The potassium bromide window 506 is selected to have a large transmittance in the infrared band. Preferably, the inert gas can be argon, nitrogen, neon, or other inert gases; Preferably, the two-color colorimeter 7 is provided with a display screen for displaying the measured temperature in real time.

[0022] In a possible implementation, the present invention also provides a material ultra-high temperature normal spectral emissivity test system, see Figure 3 ,include: The normal thermal radiation signal acquisition and processing system includes a spectrometer 1 disposed at the entrance of an external light source, which is used to cooperate with the optical path system to acquire the normal thermal radiation signals of material samples and black bodies. The spectrometer 1 is connected to a computer system 3 for processing and storing the normal thermal radiation signals and measurement results of material samples and black bodies at different temperatures; An optical system, comprising a gold-coated plane mirror 2, an aperture 4, and an off-axis parabolic mirror 6, for collecting normal thermal radiation signals of the material sample and the blackbody by the spectrometer 1, and for collecting normal thermal radiation signals of the material sample and the blackbody by the two-color colorimeter 7; The standard blackbody 10 is provided with a heating tube inside to provide the normal thermal radiation signal of the blackbody. It is symmetrically arranged on both sides of the off-axis parabolic mirror 6 with the ultra-high temperature heating furnace 5, and the distance is set at the focal length of the off-axis parabolic mirror 6 to ensure the consistency of the optical path; The ultra-high temperature heating furnace 5 is used to provide the normal thermal radiation signal of the material sample and is symmetrically arranged on both sides of the off-axis parabolic mirror 6 with the standard black body 10. The distance is set at the focal length of the off-axis parabolic mirror 6 to ensure the consistency of the optical path; A two-color colorimeter 7 is provided at one end of the optical path system, at the end of the off-axis parabolic mirror 6 away from the aperture 4, and is used to receive normal thermal radiation signals of the blackbody and the material sample and measure the surface temperature of the blackbody and the material sample; The water cooler 8 is connected to the ultra-high temperature heating furnace 5 and is used to provide cold water for cooling the ultra-high temperature heating furnace 5; an inert gas protection system 9 connected to the ultra-high temperature heating furnace 5 and used to provide inert gas protection for the ultra-high temperature heating furnace 5; Specifically, a laser is installed inside the spectrometer 1 for optical path calibration of the rotating off-axis parabolic mirror 6. The spectrometer 1 is provided with an external optical path channel. The optical path system is located on the external optical path channel and is equipped with a laser light source for allowing the normal thermal radiation signals of the material sample and the black body to enter the interior of the spectrometer 1. Conventional spectrometers only have internal optical path channels and can only measure internal laser thermal radiation signals to achieve material reflectivity and transmittance measurements. However, the spectrometer 1 of the present invention is equipped with an external channel, which can reflect the thermal radiation of external objects into the spectrometer to achieve measurement. Preferably, the standard black body 10, the aperture 4, the ultra-high temperature heating furnace 5 and the dichromatic colorimeter 7 are arranged with an off-axis parabolic mirror 6 as the center of the circle, and are spaced 90 degrees apart in the circumferential direction, and the optical path switching is achieved by rotating the off-axis parabolic mirror 6; Preferably, the computer system 3 is equipped with spectral signal acquisition software for processing the normal thermal radiation signals of the blackbody and the material sample; Preferably, the aperture 4 is an adjustable diameter aperture; Preferably, the bottom of the off-axis parabolic mirror 6 is equipped with an electric rotating base, which can be rotated according to demand so that the normal thermal radiation signals of the black body and the material sample are received by the spectrometer 1 and the two-color colorimeter 7 respectively; Preferably, the material of the heating tube provided inside the standard blackbody 10 is high-purity graphite, having an aspect ratio of more than 10 and good temperature uniformity, a blackness ≥ 0.995, and being able to provide blackbody radiation in the temperature range of 250-2300°C; Preferably, the rotating off-axis parabolic mirror 6 enables the two-color colorimeter 7 to receive the normal thermal radiation signals of the black body and the material sample, and measure the surface temperature of the black body and the material sample. The temperature measurement range is 250-2500 ° C, and the temperature measurement accuracy is ≤0.8% of the measured value; Preferably, the ultra-high temperature normal spectral emissivity testing system of a material of the present invention is constructed in accordance with the JJG215-2019 standard.

[0023] In one possible implementation, the present invention further provides a method for testing the ultra-high temperature normal spectral emissivity of a material, which uses an energy comparison method to experimentally measure the high temperature spectral emissivity of a material sample. The normal thermal radiation signals of the material sample and a blackbody are measured at the same temperature, and the two are compared to obtain the spectral emissivity of the material sample at that temperature, comprising the following steps: Step 1: Turn on the water cooler 8 and the inert gas protection system 9, then turn on and set the standard black body 10 to the black body test temperature; the water cooler 8 can reduce the external structure temperature of the standard black body 10 and the ultra-high temperature heating furnace 5 when they are running at extremely high temperatures. The inert gas protection system 9 adopts an open design. The inert gas continuously purges the heating cavity of the black body and the surface of the material sample during operation to avoid oxygen in the black body and the material sample; Step 2: Adjust the optical path system so that the blackbody normal thermal radiation signal of the standard blackbody 10 is collected by the two-color colorimeter 7, and the two-color colorimeter 7 converts the collected blackbody normal thermal radiation signal into a blackbody temperature signal; Step 3: When the blackbody temperature signal displayed by the two-color colorimeter 7 reaches the blackbody temperature to be measured, the off-axis parabolic mirror 6 is adjusted so that the blackbody normal thermal radiation signal of the standard blackbody 10 is reflected by the off-axis parabolic mirror 6, then passes through the aperture 4, and then is reflected by the gold-coated plane mirror 2 into the interior of the spectrometer 1, so that the blackbody normal thermal radiation signal is collected by the spectrometer 1. The spectrometer 1 transmits the collected blackbody normal thermal radiation signal to the computer system 3, and the computer system 3 records and processes the blackbody normal thermal radiation signal; Step 4: Adjust the optical path system, turn on the ultra-high temperature heating furnace 5 and set it to the material temperature to be measured, so that the normal thermal radiation signal of the material sample in the ultra-high temperature heating furnace 5 is collected by the two-color colorimeter 7, and the two-color colorimeter 7 converts the collected normal thermal radiation signal of the material sample into a material sample temperature signal; Step 5: When the material sample temperature signal displayed by the two-color colorimeter 7 reaches the material temperature to be measured, the off-axis parabolic mirror 6 is adjusted so that the normal thermal radiation signal of the material sample in the ultra-high temperature heating furnace 5 is reflected by the off-axis parabolic mirror 6, then passes through the aperture 4, and then is reflected by the gold-coated plane mirror 2 into the interior of the spectrometer 1, so that the normal thermal radiation signal of the material sample is collected by the spectrometer 1. The spectrometer 1 transmits the collected normal thermal radiation signal of the material sample to the computer system 3, and the computer system 3 records and processes the normal thermal radiation signal of the material sample; Step 6: Calculate the spectral emissivity of the material sample based on the normal thermal radiation signal of the blackbody and the normal thermal radiation signal of the material sample by the computer system 3; Preferably, the thermal radiation signal is thermal radiation light; Preferably, the upper limit of heating of the material sample is determined by adopting an ultra-high temperature heating furnace 5 based on a high-power graphite electric heating method, so that the temperature inside the graphite heating tube 503 reaches 2500°C, and the material sample can be heated uniformly and stably at the highest temperature. Preferably, the gold-coated plane mirror 2 and the aperture 4 remain stationary after the optical path is adjusted, and the thermal radiation optical path of the black body and the material sample is switched by rotating the off-axis parabolic mirror 6; at the same time, the off-axis parabolic mirror 6 can converge the parallel light into a point (focus), greatly reducing the influence of background stray thermal radiation signals.

[0024] The structure and working principle of the present invention are further described below: The object of the present invention is to provide an ultra-high temperature heating furnace. When using the device, first select a corresponding graphite fixture 5032 according to the shape and size of the material sample, and place the material sample in the graphite heating tube 503 through the graphite fixture 5032. In order to reduce the influence of the black body effect, the material sample is placed at a distance of no more than 40 mm from the tube mouth of the graphite heating tube. Then, a potassium bromide window 506 is placed in the ring of the inert gas distributor 5062 to prevent the influence of external airflow on the inert gas atmosphere inside the graphite heating tube 503. Then, the heating temperature is set through the control panel system, and the graphite heating tube 503 is electrically heated by heat radiation and heat conduction through the graphite electrode 5033. The heating power is adjusted by the PID control unit to achieve uniform, stable and controllable heating until the measured temperature of the furnace cavity is consistent with the set temperature. The temperature of the graphite heating tube 503 is measured by the infrared thermometer 504 in conjunction with the temperature control circuit. The deviation between the actual temperature and the set temperature is ≤1 ℃; during the heating process, the temperature of the graphite heating tube 503 can be reduced by the external water cooler 8, the water inlet cooling pipe 5052 and the water outlet cooling pipe 5055, thereby reducing the influence of the blackbody effect on the emissivity during the emissivity measurement process; in order to prevent the material sample from oxidizing during the high-temperature heating process, inert gas is also passed through the external inert gas system 9 and the inert gas pipe 5054 during the heating process to purge the interior of the graphite heating tube 503 and the surface of the material sample.

[0025] The present invention also aims to provide a material ultra-high temperature normal spectral emissivity test system. When using the system, the laser light source at the rear of the spectrometer 1 is turned on, the gold-coated plane mirror 2, the aperture 4, and the off-axis parabolic mirror 6 are rotated, and the standard black body 10 and the ultra-high temperature heating furnace 5 are moved so that the laser spot enters the interior of the standard black body 10 and irradiates the surface of the material sample respectively. Then, the optical path is calibrated, the universal wheel of the ultra-high temperature heating furnace 5 is locked, and the inert gas protection system 9, the water cooler 8, the two-color colorimeter 7, the standard black body 10 and the ultra-high temperature heating furnace 5 are turned on in sequence. The temperature of the standard black body 10 and the ultra-high temperature heating furnace 5 is adjusted to 2000-2500°C so that the black body and the material sample reach the temperature to be measured respectively. When the temperature is stable, the off-axis parabolic mirror 6 is rotated to first measure the thermal radiation signal of the black body at the temperature to be measured, and then the off-axis parabolic mirror 6 is rotated to switch the optical path and measure the thermal radiation signal of the material sample at the same temperature. After the test is completed, the temperature of the standard black body 10 and the ultra-high temperature heating furnace 5 is lowered to 600°C. ℃ below, turn off the inert gas protection system 9, the water cooler 8 and the ultra-high temperature heating furnace 5 in sequence, and finally take out the material sample. The spectral emissivity of the material sample at the temperature to be measured can be obtained by processing the thermal radiation signals of the blackbody and the material sample through the computer system 3.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ultra-high temperature heating furnace, characterized in that: The invention comprises a chassis (501), wherein a control system is integrated inside the chassis (501), a control panel system is installed on the side of the chassis (501), a heating device is installed on the top of the chassis (501), and the control system is connected to the control panel system and the heating device respectively; The heating device comprises a graphite heating tube (503), one end of the graphite heating tube (503) is installed with a first water-cooling plate (505), and the other end is installed with a second water-cooling plate (5053). An anti-oxidation system is also installed on the graphite heating tube (503). One side of the first water-cooling plate (505) and the second water-cooling plate (5053) are connected to an external water cooler (8) through a water inlet cooling pipe (5052) and a water outlet cooling pipe (5055), respectively, and are also connected to an external inert gas system (9) through an inert gas pipe (5054). Graphite electrodes (5033) are sleeved at both ends of (503), and the graphite electrodes (5033) are respectively clamped inside the first water-cooling plate (505) and the second water-cooling plate (5053) for heating the graphite heating tube (503). The outer circumference of the graphite heating tube (503) is covered with a composite thermal insulation structure (502), and the composite thermal insulation structure (502) is located between the first water-cooling plate (505) and the second water-cooling plate (5053). An infrared temperature measurement system is provided on the side of the second water-cooling plate (5053) away from the first water-cooling plate (505); A baffle (5031) is installed inside the graphite heating tube (503), and a graphite fixture (5032) is installed on a side of the baffle (5031) close to the second water-cooling plate (5053).

2. The ultra-high temperature heating furnace according to claim 1, characterized in that: The anti-oxidation system includes a potassium bromide window (506), a central perforation (5061) and an inert gas distributor (5062); The potassium bromide window (506) is installed at one end of the graphite heating tube (503) near the second water-cooling plate (5053), the graphite electrode (5033) is located between the potassium bromide window (506) and one end of the graphite heating tube (503) near the second water-cooling plate (5053), and the potassium bromide window (506) is connected to the inner cavity of the graphite heating tube (503); The middle punched hole (5061) is located on the graphite heating tube (503) between the baffle (5031) and the graphite fixture (5032); The inert gas distributor (5062) is arranged in a ring outside the potassium bromide window (506).

3. The ultra-high temperature heating furnace according to claim 1, characterized in that: The composite thermal insulation structure (502) includes a quartz glass cover (5021), carbon paper (5022) and glass fiber thermal insulation cotton (5023) in sequence from far away from the graphite heating tube (503) to close to the graphite heating tube (503), and both ends of the quartz glass cover (5021) are connected to the first water-cooling plate (505) and the second water-cooling plate (5053) through sealing rings.

4. The ultra-high temperature heating furnace according to claim 1, characterized in that: One end of the water inlet cooling pipe (5052) and the water outlet cooling pipe (5055) is connected to one side of the first water cooling plate (505) and the second water cooling plate (5053), and the other end of the water inlet cooling pipe (5052) and the water outlet cooling pipe (5055) enters the interior of the chassis (501) from the top of the chassis (501) and is then connected to the external water cooling machine (8); One end of the inert gas pipeline (5054) is connected to one side of the first water-cooling plate (505) and the second water-cooling plate (5053), and the other end of the inert gas pipeline (5054) enters the interior of the chassis (501) from the top of the chassis (501) and is then connected to the external inert gas system (9).

5. The ultra-high temperature heating furnace according to claim 1, characterized in that: The infrared temperature measurement system comprises a pressing device (5051), an infrared opening observation window (5041), and an infrared thermometer (504); The pressing device (5051) is installed on a side of the first water-cooling plate (505) away from the second water-cooling plate (5053), and an opening is provided on the side of the pressing device (5051) away from the first water-cooling plate (505) to form an infrared opening observation window (5041). The infrared thermometer (504) is installed on a side of the infrared opening observation window (5041) away from the pressing device (5051), and the infrared thermometer (504) is coaxially arranged with the graphite heating tube (503).

6. The ultra-high temperature heating furnace according to claim 5, characterized in that: The control system includes a power supply, a temperature control circuit, a PID control unit and a transformer; The power supply is connected to the PID control unit, the transformer, the control panel system, the infrared thermometer (504) and the graphite electrode (5033) respectively through the temperature control circuit.

7. The ultra-high temperature heating furnace according to claim 6, characterized in that: The control panel system includes an emergency start / stop button (507), a temperature setting panel (5071) located on top of the emergency start / stop button (507), an alarm indicator light (5072), a heating furnace input power display panel (5073), a cooling water temperature display panel (5074), a power switch (5075), and a gas flow control button (5076).

8. A material ultra-high temperature normal spectral emissivity test system, characterized in that: An ultra-high temperature heating furnace according to any one of claims 1 to 7, comprising: A normal thermal radiation signal acquisition and processing system includes a spectrometer (1) disposed at an entrance of an external light source and used to cooperate with an optical path system to acquire normal thermal radiation signals of a material sample and a black body. The spectrometer (1) is connected to a computer system (3) for processing and storing normal thermal radiation signals and measurement results of material samples and black bodies at different temperatures. An optical path system, comprising a gold-coated plane mirror (2), an aperture (4), and an off-axis parabolic mirror (6), for allowing the normal thermal radiation signals of the material sample and the black body to be collected by the spectrometer (1), and for allowing the normal thermal radiation signals of the material sample and the black body to be collected by the two-color colorimeter (7); A standard black body (10) is provided with a heating tube inside for providing a normal thermal radiation signal of the black body, and is symmetrically arranged on both sides of the off-axis parabolic mirror (6) with the ultra-high temperature heating furnace (5), and is located at the focal length of the off-axis parabolic mirror (6) to ensure the consistency of the optical path; An ultra-high temperature heating furnace (5) is used to provide a normal thermal radiation signal of the material sample, and is symmetrically arranged on both sides of the off-axis parabolic mirror (6) with the standard black body (10), and is located at the focal length of the off-axis parabolic mirror (6) to ensure the consistency of the optical path; A two-color colorimeter (7) is provided at one end of the optical path system, located at the end of the off-axis parabolic mirror (6) away from the aperture (4), and is used to receive normal thermal radiation signals of the black body and the material sample and measure the surface temperature of the black body and the material sample; A water cooler (8) is connected to the ultra-high temperature heating furnace (5) and is used to provide cold water for cooling the ultra-high temperature heating furnace (5); An inert gas protection system (9) is connected to the ultra-high temperature heating furnace (5) and is used to provide inert gas protection for the ultra-high temperature heating furnace (5).

9. A material ultra-high temperature normal spectral emissivity testing system according to claim 8, characterized in that: The spectrometer (1) is internally installed with a laser for optical path calibration. The spectrometer (1) is provided with an external optical path channel. The optical path system is located on the external optical path channel and is used to allow normal thermal radiation signals of the material sample and the black body to enter the interior of the spectrometer (1).

10. A method for testing the ultra-high temperature normal spectral emissivity of a material, characterized in that: A material ultra-high temperature normal spectral emissivity testing system according to any one of claims 8-9 comprises the following steps: Turn on the water cooler (8) and the inert gas protection system (9), then turn on and set the standard black body (10) to the black body temperature to be measured; Adjusting the optical path system so that the blackbody normal thermal radiation signal of the standard blackbody (10) is collected by the two-color colorimeter (7), and the two-color colorimeter (7) converts the collected blackbody normal thermal radiation signal into a blackbody temperature signal; When the blackbody temperature signal displayed by the two-color colorimeter (7) reaches the blackbody temperature to be measured, the off-axis parabolic mirror (6) is adjusted so that the blackbody normal thermal radiation signal of the standard blackbody (10) is reflected by the off-axis parabolic mirror (6), then passes through the aperture (4), and then is reflected by the gold-coated plane mirror (2) into the interior of the spectrometer (1), so that the blackbody normal thermal radiation signal is collected by the spectrometer (1), and the spectrometer (1) transmits the collected blackbody normal thermal radiation signal to the computer system (3); Adjust the optical path system, turn on the ultra-high temperature heating furnace (5) and set it to the material temperature to be measured, so that the normal thermal radiation signal of the material sample in the ultra-high temperature heating furnace (5) is collected by the two-color colorimeter (7), and the two-color colorimeter (7) converts the collected normal thermal radiation signal of the material sample into a material sample temperature signal; When the material sample temperature signal displayed by the two-color colorimeter (7) reaches the material temperature to be measured, the off-axis parabolic mirror (6) is adjusted so that the normal thermal radiation signal of the material sample in the ultra-high temperature heating furnace (5) is reflected by the off-axis parabolic mirror (6), then passes through the aperture (4), and then is reflected by the gold-coated plane mirror (2) into the interior of the spectrometer (1), so that the normal thermal radiation signal of the material sample is collected by the spectrometer (1), and the spectrometer (1) transmits the collected normal thermal radiation signal of the material sample to the computer system (3); The spectral emissivity of the material sample is calculated by the computer system (3) based on the normal thermal radiation signal of the black body and the normal thermal radiation signal of the material sample.

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