High-temperature fluid material dielectric property long-distance testing device and testing method thereof

Abstract

The invention provides a long-distance testing device for the dielectric property of a high-temperature fluid material, and belongs to the field of dielectric property testing. According to the device, the point focusing antenna is loaded on the resonant cavity, the to-be-measured material is placed at the focus of the point focusing antenna, and the influence of the dielectric material on antennaradiation is converted into the change of resonant cavity resonance parameters, so that the dielectric property of the to-be-measured material is measured; in the whole testing process, the dielectric property test can be achieved without contacting with a to-be-tested material, the device has the characteristics of high test sensitivity, long action distance and the like, and the test device issimple and easy to install and is suitable for on-site in-situ detection. Besides, under the condition that the position of the to-be-tested material is fixed, the testing device can be placed on themoving platform, and equivalent dielectric property testing of the fluid material which is a special material with non-uniform distribution at different positions can be achieved by moving the testingdevice.

Description

technical field [0001] The invention belongs to the field of dielectric property testing, and relates to a long-distance testing device for dielectric properties, in particular to an antenna-loaded resonance device for long-distance in-situ testing of the dielectric properties of high-temperature fluid materials and a testing method thereof. Background technique [0002] With the rapid development of modern aerospace, rocket and missile technology, the flight speed of aircraft has reached the hypersonic level. When a vehicle flies at such high speeds, the interaction of its surface with the surrounding gas creates a high-temperature flow field. Therefore, it is of great significance to accurately obtain key parameters such as electron number density and dielectric properties of such flow fields to solve aircraft communication and targeting problems. [0003] At present, for fluid materials in extreme environments such as high temperature and high pressure (such as jet engin...

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Problems solved by technology

For example, the probe test method provided in the patent No. CN93214615.5 "Plasma Probe Diagnostic Tester" requires that the probe be inserted into the material for contact testing, which will not only disturb the fluid material to be tested, but also cause the probe to It is also difficult to withstand extremely high temperatures; although the antenna-based transmission / reflection method provided in the patent No. CN201711279106.X "A Testing System and Method for a Supersonic Two-dimensional Plasma Sheath" can realize long-distance non-contact testing, However, the test accuracy is not high; the quasi-optical cavity method provided in the patent No. CN201310247383.8 "A New Method for Rapid Real-time Diagnosis of Plasma Using a Quasi-Optical Resonant Cavity" can realize non-contact high-precision testing, but the The material needs to pass through the cavity, and the quasi-cavity reflector must keep a safe distance from the material to be tested, which limits the size of the material to be tested, making it impossible to test large-area high-temperature fluid materials

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