CN113030137B - System and method for measuring high-temperature reflectivity of wave-absorbing material based on temperature detection - Google Patents
System and method for measuring high-temperature reflectivity of wave-absorbing material based on temperature detection Download PDFInfo
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- CN113030137B CN113030137B CN202110280502.4A CN202110280502A CN113030137B CN 113030137 B CN113030137 B CN 113030137B CN 202110280502 A CN202110280502 A CN 202110280502A CN 113030137 B CN113030137 B CN 113030137B
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- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/20008—Constructional details of analysers, e.g. characterised by X-ray source, detector or optical system; Accessories therefor; Preparing specimens therefor
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Abstract
The invention relates to the technical field of reflectivity measurement, in particular to a system and a method for measuring the high-temperature reflectivity of a wave-absorbing material based on temperature detection. This measurement system includes the bow-shaped frame, transmitting antenna, receiving antenna, closed heating furnace and measurement and control portion, it realizes through closed heating furnace that the supporting part stretches out the piece that awaits measuring outside the furnace body, conveniently carry out various measurements, after the piece that awaits measuring is moved out the furnace body outside, realize the real time monitoring of temperature through infrared thermometer to the piece that awaits measuring, and trigger the measurement according to predetermineeing measurement temperature, in order to get up measured reflectivity and temperature correspondence, when realizing the high temperature reflectivity measurement, can also improve measurement accuracy. The measuring method is based on the cooperation of temperature detection, closed heating and measurement outside the furnace, triggering measurement and control through infrared temperature measurement, converting the traditional concept of temperature rise test into temperature drop test, and realizing accurate measurement of high-temperature reflectivity.
Description
Technical Field
The invention relates to the technical field of reflectivity measurement, in particular to a system and a method for measuring the high-temperature reflectivity of a wave-absorbing material based on temperature detection.
Background
The reflectivity is an important index for evaluating the wave-absorbing material, and the emissivity of the wave-absorbing material is defined as follows: under the condition of given wavelength and polarization, electromagnetic waves enter a radar wave-absorbing material plane and a good conductor plane from the same direction at the same power density, and the ratio of the reflection power of the radar wave-absorbing material plane to the reflection power of the good conductor plane with the same size in the mirror surface direction is obtained.
Common reflectivity measurement methods mainly include a bow method, an RCS method, a waveguide method, and the like. Wherein the bow method adopts the bow-shaped frame, and the system is comparatively simple, easily realizes high low temperature test. The heating method in the traditional high-temperature reflectivity test usually adopts an open heating method, although the influence on the test precision can be reduced by heating the hidden heating device at the back, the high-temperature reflectivity test method is difficult to heat to the high temperature of more than 1000 ℃, and the high-temperature reflectivity measurement of the wave-absorbing material cannot be realized.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a system for measuring the high-temperature reflectivity of a wave-absorbing material based on temperature detection, which solves the problem that the measurement of the high-temperature reflectivity of the wave-absorbing material cannot be realized in the prior art.
The second purpose of the invention is to provide a method for measuring the high-temperature reflectivity of the wave-absorbing material based on temperature detection, and the method adopts a cooling test method to measure the high-temperature reflectivity of the wave-absorbing material based on temperature detection, so as to solve the problem that the measurement of the high-temperature reflectivity of the wave-absorbing material cannot be realized in the prior art.
(II) technical scheme
In order to achieve the first object, in a first aspect, the invention provides a wave-absorbing material high-temperature reflectivity measurement system based on temperature detection, which comprises an arch frame, a transmitting antenna, a receiving antenna, a closed heating furnace and a measurement and control part, wherein the arch frame is provided with a first opening and a second opening;
the transmitting antenna and the receiving antenna are symmetrically arranged on the bow rack and can move along the bow rack;
the closed heating furnace comprises a furnace body, a furnace cover, a lifting supporting part, a heating rod, an thermocouple temperature measurer, a vacuumizing device and a gas injection device, wherein the heating rod is arranged in the furnace body and used for heating, the lifting supporting part is arranged in the furnace body and used for supporting a piece to be measured and driving the piece to be measured to extend out of the furnace body, at least one part of the thermocouple temperature measurer is arranged in the furnace body and used for measuring the temperature in the furnace body, the furnace cover is arranged on the furnace body in an openable and closable manner, the vacuumizing device is used for vacuumizing the furnace body, and the gas injection device is used for injecting anti-oxidation gas into the furnace body; and
the measurement and control part comprises an infrared thermometer, a vector network analyzer and a computer, after the piece to be measured extends out of the furnace body, the infrared thermometer can measure the temperature of the piece to be measured, a trigger signal is sent to the vector network analyzer, the measured temperature is sent to the computer, the vector network analyzer receives the trigger measurement signal, then controls the transmitting antenna and the receiving antenna to work, receives echo data transmitted by the receiving antenna, and sends the echo data to the computer.
Preferably, the over-and-under type supporting part includes lift portion and brace table, and the one end and the furnace body of lift portion are connected, and the other end is connected with the brace table, and the side of going up of brace table is used for placing the piece that awaits measuring.
Preferably, the size of the upper side of the support platform is larger than that of the lower side of the support platform, so that the upper side and the lower side of the support platform are in transitional connection through an inclined plane.
Preferably, both the upper and lower sides of the support table are square.
Preferably, the furnace body and the supporting platform are made of the same high-temperature-resistant ceramic material, and the edges of all the surfaces of the supporting platform are chamfered.
Preferably, the transmitting antenna and the receiving antenna both adopt ultra-wideband antennas.
In order to achieve the second object of the present invention, in a second aspect, the present invention further provides a method for measuring a high temperature reflectivity of a wave-absorbing material based on temperature detection, where a system for measuring a high temperature reflectivity of a wave-absorbing material based on temperature detection in any implementation manner of the first aspect is adopted, and the method includes the following steps:
the preparation method comprises the following steps: calibrating the infrared thermometer;
a measurement step: placing a piece to be tested on a lifting support part in a furnace body, covering a furnace cover, vacuumizing the furnace body, and injecting anti-oxidation gas;
heating the to-be-detected piece to a preset uncovering temperature, opening a furnace cover, extending the to-be-detected piece out of a furnace body through a lifting supporting part, and aligning a transmitting antenna, a receiving antenna and an infrared thermometer to the to-be-detected piece;
when the infrared thermometer detects that the temperature of the to-be-measured piece reaches a preset measurement temperature, a trigger measurement signal is sent to the vector network analyzer, and meanwhile, temperature data are transmitted to the computer;
after receiving the trigger measurement signal, the vector network analyzer controls the transmitting antenna and the receiving antenna to start working, receives echo data transmitted by the receiving antenna, and sends the echo data to a computer to finish measurement;
wherein the preset uncapping temperature is greater than the preset measuring temperature;
and respectively taking the wave-absorbing material plate and the good conductor plate as the to-be-measured pieces according to the measuring steps, wherein the measuring conditions of the wave-absorbing material plate and the good conductor plate are the same.
Preferably, the infrared thermometer sends a trigger measurement signal to the vector network analyzer in a pulse mode; and/or
The temperature measuring area of the infrared thermometer is overlapped with the radiation areas of the transmitting antenna and the receiving antenna.
Preferably, a plurality of measurement temperatures are preset, an allowable temperature difference of the measurement temperatures is preset, and when the temperature difference between the actual temperature measured by the infrared thermometer and the preset measurement temperature is within the allowable temperature difference range, the infrared thermometer sends a trigger measurement signal to the vector network analyzer.
Preferably, before calculating the reflectivity, the computer respectively processes the measured echo data of the wave-absorbing material plate and the good conductor plate by using the same size of range gates.
(III) advantageous effects
The technical scheme of the invention has the following advantages: the invention provides a wave-absorbing material high-temperature reflectivity measuring system based on temperature detection, which comprises an arch frame, a transmitting antenna, a receiving antenna, a closed heating furnace and a measurement and control part, wherein the closed heating furnace is used for realizing that a piece to be measured extends out of a furnace body through a supporting part, so that various measurements can be conveniently carried out, after the piece to be measured is moved out of the furnace body, the infrared thermometer is used for realizing real-time monitoring of the temperature of the piece to be measured, and the measurement is triggered according to the preset measurement temperature, so that the measured reflectivity and the temperature are corresponding, the measurement of the high-temperature reflectivity is realized, and the measurement precision can also be improved.
According to the method for measuring the high-temperature reflectivity of the wave-absorbing material based on temperature detection, based on the cooperation of the temperature detection and the closed heating and external measuring modes, measurement and control are triggered through infrared temperature measurement, the traditional concept of temperature rise test is converted into temperature drop test, and the high-temperature reflectivity is accurately measured.
Drawings
The drawings of the present invention are provided for illustrative purposes only, and the proportion and the number of the components in the drawings do not necessarily correspond to those of an actual product.
Fig. 1 is a schematic structural diagram of a system for measuring high-temperature reflectivity of a wave-absorbing material based on temperature detection according to an embodiment of the invention;
FIG. 2 is a schematic structural view of a closed-type heating furnace according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a support stage according to an embodiment of the invention.
In the figure: 1: an arch frame; 2: a transmitting antenna; 3: a receiving antenna; 4: a closed heating furnace; 41: a furnace body; 42: a furnace cover; 43: a lifting support part; 431: a lifting part; 432: a support table; 44: a heating rod; 45: a thermocouple thermoscope; 5: an infrared thermometer; 6: a vector network analyzer; 7: a computer; 8: and (5) a piece to be tested.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example one
Referring to fig. 1 and 2, a wave-absorbing material high-temperature reflectivity measurement system based on temperature detection provided by the embodiment of the invention comprises an arched frame 1, a transmitting antenna 2, a receiving antenna 3, a closed heating furnace 4 and a measurement and control part. Therein, referring to fig. 1, the transmitting antenna 2 and the receiving antenna 3 are symmetrically arranged on the bow 1 and can be moved along the bow 1 to adjust the position and angle of the transmitting antenna 2 and the receiving antenna 3.
Referring to fig. 1 and 2, the closed heating furnace 4 includes a furnace body 41, a furnace cover 42, a lifting support 43, a heating rod 44, a thermocouple temperature measurer 45, a vacuum-pumping device (not shown), and a gas injection device (not shown), wherein the heating rod 44 is disposed in the furnace body 41 and serves as a heating portion of the closed heating furnace 4 for heating. The lifting support part 43 is arranged in the furnace body 41 and is used for supporting the to-be-measured piece 8 and driving the to-be-measured piece 8 to extend out of the furnace body 41, so that corresponding measurement can be carried out. At least a part of the thermocouple temperature detector 45 is arranged in the furnace body 41 and is used for measuring the temperature in the furnace body 41. The furnace cover 42 is provided in the furnace body 1 to be openable and closable as required. The evacuation device is used to evacuate the furnace body 41, and the gas injection device is used to inject an anti-oxidation gas (e.g., nitrogen, helium, neon, argon, krypton, xenon, radon, etc.), preferably argon, into the furnace body 41.
Referring to fig. 1, the measurement and control part includes an infrared thermometer 5, a vector network analyzer 6 and a computer 7, wherein the infrared thermometer 5 is in signal connection with the vector network analyzer 6 and the computer 7 respectively, and the vector network analyzer 6 is in signal connection with the transmitting antenna 2, the receiving antenna 3 and the computer 7 respectively. When measurement is needed, after the piece to be measured 8 extends out of the furnace body 41, the infrared thermometer 5 can measure the temperature of the piece to be measured 8, send a trigger measurement signal to the vector network analyzer 6, and send the measured temperature to the computer 7, after receiving the trigger signal, the vector network analyzer 6 controls the transmitting antenna 2 and the receiving antenna 3 to work, and sends echo data transmitted by the receiving antenna to the computer 7.
This absorbing material high temperature reflectivity measurement system based on temperature detection realizes through closed heating furnace 4 that supporting part 43 stretches out the piece 8 that awaits measuring outside furnace body 41, conveniently carries out various measurements, after the piece 8 that awaits measuring is shifted out outside furnace body 41, realizes the real time monitoring of temperature through infrared thermometer 5 to the piece 8 that awaits measuring to according to predetermineeing the measurement temperature trigger measurement, in order to get up measured reflectivity and temperature correspondence, when realizing high temperature (more than 1000 ℃) reflectivity measurement, can also improve measurement accuracy.
In some preferred embodiments, see fig. 1, a thermocouple thermometer 45 is in signal communication with the computer 7 and is capable of transmitting the measured temperature to the computer 7. Of course, in other embodiments, the temperature reading of the thermocouple temperature measurer 45 may be realized by providing a display part on the outer side of the enclosed heating furnace 4.
Referring to fig. 1 and 2, in some preferred embodiments, the lifting and lowering support portion 43 includes a lifting and lowering portion 431 and a support table 432, one end of the lifting and lowering portion 431 is connected to the furnace body 41, the other end of the lifting and lowering portion is connected to the support table 432, and an upper side of the support table 432 is used for placing the to-be-tested piece 8. The lifting part 431 lifts by driving the supporting part 432 to move the to-be-detected part 8 on the supporting platform 432. In a specific embodiment, the lifting unit 431 may be a conventional electric lifting structure applied in a high temperature environment, for example, an electric lifting rod, a hydraulic lifting unit, a mechanical lifting structure, and the like, and is not limited herein. Preferably, the lifting support 43 can extend the object 8 to be measured out of the furnace body 41 by at least 10cm, so as to reduce the influence of the enclosed heating furnace 4 on the measurement.
In order to further improve the measurement accuracy and reduce the influence of the support table 432 on the measurement, in some preferred implementations, as shown in fig. 3, the upper side of the support table 432 is larger than the lower side of the support table 432, so that the upper side and the lower side of the support table 432 are connected by an inclined surface. In order to ensure that the to-be-measured piece 8 is fully and completely contacted with the upper side surface of the supporting table 432, the size of the upper side surface of the supporting table 432 is the same as that of the to-be-measured piece 8, and the position where the to-be-measured piece is placed at each time can be ensured to be the same.
In order to reduce the influence of the enclosed heating furnace 4 on the measurement, in some preferred embodiments, the furnace body 41 and the supporting table 432 are made of the same high-temperature-resistant ceramic material, more preferably, the furnace body 41 and the supporting table 432 are made of the same high-temperature-resistant ceramic material, and in order to reduce the occurrence of cracking of the high-temperature-resistant ceramic material during heating, the edge of the supporting table 432 is preferably chamfered.
In one embodiment, the upper and lower sides of the support table 432 are square, and the dimensions of the upper side and the dimension of the object 8 are 100mm × 100mm. Of course, in other embodiments, the upper and lower sides of the support table 432 may have other shapes, such as circular, rectangular, etc., and the size may be adjusted as desired.
In order to realize broadband testing, in some preferred embodiments, the transmitting antenna 2 and the receiving antenna 3 both adopt ultra-wideband antennas, in one specific embodiment, the testing bandwidth of the transmitting antenna 2 and the receiving antenna 3 is 4-18GHz, and in another specific embodiment, the testing bandwidth of the transmitting antenna 2 and the receiving antenna 3 is 18-40GHz, so that the radial resolution of the test can be ensured to be better than 2mm.
It should be noted that the closed heating furnace 4 of the present invention may adopt a closed heating furnace structure that is well known in the art, and cooling structures (generally, water cooling structures) are provided in the wall body of the furnace body 41 and the wall body of the furnace cover 42, which are also known in the art. In addition, the vacuum-pumping device and the gas injection device, as well as the connection between the vacuum-pumping device and the gas injection device and the furnace body 41, are all the prior art, and therefore, the detailed description thereof is omitted.
It should be further noted that the bow-shaped frame 1, the transmitting antenna 2, the receiving antenna 3, the connection structure and the adjustment structure and manner thereof are all the prior art, and are not described herein again.
Example two
The method for measuring the high-temperature reflectivity of the wave-absorbing material based on temperature detection provided by the second embodiment can be implemented by using any one of the systems for measuring the high-temperature reflectivity of the wave-absorbing material based on temperature detection, and comprises the following steps:
the preparation method comprises the following steps: and calibrating the infrared thermometer to realize accurate temperature measurement of the infrared thermometer.
And (3) measuring: the good conductor plate is placed on the lifting support part in the furnace body, the furnace body is vacuumized after the furnace cover is closed, and an anti-oxidation gas (such as nitrogen, helium, neon, argon, krypton, xenon, radon and the like) is injected to prevent the good conductor plate from being oxidized at high temperature, and argon is preferably used.
The furnace cover is opened after the to-be-detected piece is heated to the preset cover opening temperature, the to-be-detected piece extends out of the furnace body through the lifting supporting portion, and the transmitting antenna, the receiving antenna and the infrared thermometer are all aligned to the good conductor plate.
And when the infrared thermometer detects that the temperature of the good conductor plate reaches a preset measurement temperature, sending a trigger measurement signal to the vector network analyzer, and simultaneously transmitting temperature data to the computer.
And after receiving the trigger measurement signal, the vector network analyzer controls the transmitting antenna and the receiving antenna to start working, and transmits the received echo data to the computer to finish measurement.
Wherein, predetermine uncap the temperature and be greater than predetermine the measurement temperature, what adopt in the scheme of this application is that cooling mode realizes pyrometric scheme promptly, can reduce calorific loss to the influence that detects the precision.
And repeating the measurement steps to measure the wave-absorbing material plate, wherein the measurement conditions of the wave-absorbing material plate and the wave-absorbing material plate are the same, and calculating the obtained data through a computer to output a required reflectivity-temperature curve.
In some preferred embodiments, the infrared thermometer sends a trigger measurement signal to the vector network analyzer in a pulse mode, the measurement speed is high and stable, and errors caused by temperature changes can be reduced.
In order to realize continuous and accurate measurement of different temperatures, in some preferred embodiments, a plurality of measurement temperatures are preset simultaneously, and an allowable temperature difference of the measurement temperatures is preset, and when a temperature difference between an actual temperature measured by the infrared thermometer and the preset measurement temperature is within a preset allowable temperature difference range, the infrared thermometer sends a trigger measurement signal to the vector network analyzer.
In order to further improve the testing precision, in some preferred embodiments, the temperature measuring area of the infrared thermometer coincides with the radiation areas of the transmitting antenna and the receiving antenna, so that the precision of the corresponding relation between the temperature and the reflectivity can be improved.
Before calculating the reflectivity, the computer respectively processes the measured echo data of the wave absorbing material plate and the good conductor plate by adopting the distance gates with the same size. In the data processing process, the data of the good conductor plate and the wave-absorbing material plate are processed by using a distance gate (for example, the central position is the highest peak of a target area, and the width is 100 mm) with the same size, the result is converted into a frequency domain and compared, and the reflectivity of the wave-absorbing material plate at the temperature is obtained.
In summary, the system and the method for measuring the high-temperature reflectivity of the wave-absorbing material based on temperature detection provided by the invention can trigger measurement according to the preset measurement temperature based on the temperature detection of the infrared thermometer and through the cooperation of the closed heating furnace and the lifting support part, so that the measurement of the high-temperature reflectivity can be realized, and the measurement precision can be improved.
It should be noted that, the calibration method of the infrared thermometer is the prior art, and is not described herein again.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: each embodiment does not include only one independent technical solution, and in the case of no conflict between the solutions, the technical features mentioned in the respective embodiments may be combined in any manner to form other embodiments as will be understood by those skilled in the art.
Furthermore, modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, without departing from the scope of the present invention, and the essence of the corresponding technical solutions does not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for measuring the high-temperature reflectivity of a wave-absorbing material based on temperature detection is characterized by comprising the following steps: adopt absorbing material high temperature reflectivity measurement system based on temperature detection to measure, absorbing material high temperature reflectivity measurement system includes bow-shaped frame, transmitting antenna, receiving antenna, transmitting antenna with receiving antenna symmetrical setting is in the bow-shaped frame just can be followed the bow-shaped frame removes, still includes:
the closed heating furnace comprises a furnace body, a furnace cover, a lifting supporting part, a heating rod, a thermocouple temperature measurer, a vacuumizing device and a gas injection device, wherein the heating rod is arranged in the furnace body and used for heating, the lifting supporting part is arranged in the furnace body and used for supporting a to-be-measured piece and driving the to-be-measured piece to extend out of the furnace body, at least one part of the thermocouple temperature measurer is arranged in the furnace body and used for measuring the temperature in the furnace body, the furnace cover is arranged on the furnace body in an openable and closable manner, the vacuumizing device is used for vacuumizing the furnace body, and the gas injection device is used for injecting anti-oxidation gas into the furnace body; and
the measurement and control part comprises an infrared thermometer, a vector network analyzer and a computer, and the infrared thermometer can measure the temperature of the to-be-measured piece after the to-be-measured piece extends out of the furnace body;
the measuring method comprises the following steps:
the preparation method comprises the following steps: calibrating the infrared thermometer;
a measurement step: placing a piece to be tested on the lifting support part in the furnace body, covering the furnace cover, vacuumizing the furnace body, and injecting anti-oxidation gas;
heating the to-be-detected piece to a preset cover opening temperature, opening the furnace cover, extending the to-be-detected piece out of the furnace body through the lifting supporting part, and aligning the transmitting antenna, the receiving antenna and the infrared thermometer to the to-be-detected piece;
when the infrared thermometer detects that the temperature of the to-be-measured piece reaches a preset measurement temperature, sending a trigger measurement signal to the vector network analyzer, and simultaneously transmitting temperature data to the computer;
after receiving a trigger measurement signal, the vector network analyzer controls the transmitting antenna and the receiving antenna to start working, receives echo data transmitted by the receiving antenna, and transmits the echo data to the computer to finish measurement;
the preset uncapping temperature is greater than the preset measuring temperature;
and respectively taking the wave-absorbing material plate and the good conductor plate as the piece to be measured according to the measuring steps, wherein the measuring conditions of the wave-absorbing material plate and the good conductor plate are the same.
2. The method for measuring the high-temperature reflectivity of the wave-absorbing material according to claim 1, which is characterized in that: the over-and-under type supporting part includes lift portion and brace table, the one end of lift portion with furnace body connects, the other end with the brace table is connected, the side of going up of brace table is used for placing the piece that awaits measuring.
3. The method for measuring the high-temperature reflectivity of the wave-absorbing material according to claim 2, wherein the method comprises the following steps: the size of the upper side surface of the supporting table is larger than that of the lower side surface of the supporting table, so that the upper side surface and the lower side surface of the supporting table are in transitional connection through inclined surfaces.
4. The method for measuring the high-temperature reflectivity of the wave-absorbing material according to claim 3, wherein the method comprises the following steps: the upper side and the lower side of the supporting table are both square.
5. The method for measuring the high-temperature reflectivity of the wave-absorbing material according to claim 3 or 4, which is characterized in that: the furnace body and the supporting platform are made of the same high-temperature-resistant ceramic material, and the edges of all the surfaces of the supporting platform are chamfered.
6. The method for measuring the high-temperature reflectivity of the wave-absorbing material according to claim 1, which is characterized in that: the transmitting antenna and the receiving antenna both adopt ultra-wideband antennas.
7. The method for measuring the high-temperature reflectivity of the wave-absorbing material according to claim 1, which is characterized in that: the infrared thermometer sends the trigger measurement signal to the vector network analyzer in a pulse mode; and/or
And the temperature measuring area of the infrared thermometer is superposed with the radiation areas of the transmitting antenna and the receiving antenna.
8. The method for measuring the high-temperature reflectivity of the wave-absorbing material according to claim 1 or 7, which is characterized in that: and presetting a plurality of measurement temperatures, presetting an allowable temperature difference of the measurement temperatures, and when the temperature difference between the actual temperature measured by the infrared thermometer and the preset measurement temperature is within the allowable temperature difference range, sending the trigger measurement signal to the vector network analyzer by the infrared thermometer.
9. The method for measuring the high-temperature reflectivity of the wave-absorbing material according to claim 1 or 7, which is characterized in that: before the reflectivity calculation is carried out, the computer respectively processes the measured echo data of the wave-absorbing material plate and the good conductor plate by adopting distance gates with the same size.
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