Workpiece bearing platform and heating device for testing reflectivity of wave absorbing material

Abstract

The invention discloses a workpiece bearing platform and a heating device for testing reflectivity of a wave absorbing material. The workpiece bearing platform comprises a support column and a bearingplatform connected to the top of the support column, wherein the bearing platform comprises a lower bottom plate, an intermediate heat insulation piece and a test back plate for bearing a sample plate to be tested; the test back plate is supported on the lower bottom plate through the intermediate heat insulation piece; the lower bottom plate is connected to the support column; the periphery of the intermediate heat insulation piece is coated with a wave absorbing enclosure plate; the heating device comprises a manipulator, a heating furnace with a hearth and a workpiece bearing platform; a furnace opening with a downward opening is formed in the hearth; and the manipulator is connected with the heating furnace and can drive the heating furnace to move, so as to enable the workpiece bearing platform to extend into the furnace opening or enable the workpiece bearing platform to withdraw away from the furnace opening. The device has the advantages of good heat preservation performance,high heating efficiency, good heating uniformity, safe and reliable use, capability of greatly improving testing precision and the like.

Description

technical field [0001] The invention relates to the technical field of microwave testing equipment, in particular to a workpiece support platform and a heating device for testing the reflectivity of a microwave-absorbing material. Background technique [0002] Radar absorbing materials (referred to as absorbing materials) are widely used in civil and military fields, and radar reflectivity (referred to as reflectivity) is an important index parameter used to evaluate the absorbing performance of absorbing materials. The reflectivity measurement technology of absorbing materials at room temperature is relatively mature and has been widely used. However, as engines, high-speed aircraft and high-power microwave devices increase the temperature resistance of absorbing materials, radar The requirements of the reflectivity test system are also getting higher and higher. [0003] At present, the high-temperature reflectivity test system mainly adopts the method of bottom heating, ...

AI Technical Summary

Problems solved by technology

The flat plate test base is the same as the test base of the normal temperature reflectance test system. The heating element is arranged under the sample to be tested, but because the heating element layout area cannot exceed the size of the sample to be tested, and is limited by the installation accessories such as heating element electrodes and binding posts, heating The body area will be smaller than the area of ​​the sample to be tested, so there is a problem of uneven heating. The temperature in the central area of ​​the sample to be tested is obviously higher than the surrounding area, resulting in inaccurate test temperature and deformation of the sample to be tested due to uneven heating.

In order to solve the problem of heating uniformity, the Chinese patent application number 201320235754.6 discloses a high-temperature test platform for reflectivity of a hypotenuse test seat. The test platform increases the area of ​​the heating body, making the area of ​​the heating body larger than the area of ​​the test sample. The problem of uneven heating of the flat-panel test seat is well alleviated, but because the area of ​​the heating body is larger than the area of ​​the sample to be tested, especially the area where the heating body is larger than the sample to be tested is treated with a hypotenuse, there is a large error in the electromagnetic wave oblique incidence test process , resulting in the inability to accurately measure the reflectance under oblique incidence conditions

In addition, the sample insulation system of the existing high-temperature reflectance testing system adopts the manual opening method, which has the disadvantages of high temperature easily causing burns to personnel and long operating time.

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