Method for detecting wave-absorbing performance of carbon nanotube wave-absorbing material based on reflection characteristics

A technology of carbon nanotubes and wave absorbing properties, applied in the field of non-destructive testing

Active Publication Date: 2020-07-07
BEIJING UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of comprehensive and effective evaluation of the absorbing performance of c

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  • Method for detecting wave-absorbing performance of carbon nanotube wave-absorbing material based on reflection characteristics
  • Method for detecting wave-absorbing performance of carbon nanotube wave-absorbing material based on reflection characteristics
  • Method for detecting wave-absorbing performance of carbon nanotube wave-absorbing material based on reflection characteristics

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Embodiment Construction

[0036] Below in conjunction with specific example, content of the present invention is described in further detail:

[0037] Step 1): Establish the formula for the dielectric properties of the carbon nanotube / polymer composite material.

[0038] It should be noted that, in general, the dielectric constant of homogeneous isotropic materials is a function of frequency and temperature, while the dielectric properties of polymers are little affected by frequency and temperature. Within a certain frequency range, the Its dielectric constant is regarded as a constant. The material parameters are: the length is about 1μm, the diameter is 10nm, the aspect ratio is 100, the thickness is 2mm, and the real part of relative complex permittivity ε′ mr is 100, DC conductivity σ m is 885S / m, the relative complex permittivity ε of the polymer binder dr =4.6-i3.2

[0039] Relative complex permittivity ε of carbon nanotubes and polymers in composites c , ε p Respectively expressed as:

...

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Abstract

The invention discloses a method for detecting the wave-absorbing performance of a carbon nanotube wave-absorbing material, relates to a method for calculating an electromagnetic wave reflection coefficient, and belongs to the technical field of nondestructive testing. Carbon nanotubes are an important wave-absorbing material in the stealth technology, and detection and evaluation of the wave-absorbing performance of carbon nanotube wave-absorbing materials with different volume ratios are hot spot issues in engineering application research. In wave-absorbing performance detection mainly basedon electromagnetic wave reflection characteristics, a reflection coefficient curve comprises a lot of information in the aspect of wave-absorbing performance of the wave-absorbing material, such as -10dB bandwidth, reflection coefficient minimum value and center frequency. According to the invention, modeling is carried out based on electromagnetic wave reflection characteristics in the wave-absorbing material, a new method for characterizing the wave-absorbing performance of the carbon nanotube wave-absorbing material by using a reflection coefficient is proposed, and the dielectric characteristics of the carbon nanotube wave-absorbing material are quantitatively analyzed by using an equivalent resistance-capacitance network model; a layered medium propagation model is used for analyzingreflection characteristics of electromagnetic waves during propagation in a metal substrate wave-absorbing medium, characteristic parameters are extracted, and the detection of the wave-absorbing performance of the carbon nanotube wave-absorbing materials with different volume ratios is realized.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and specifically relates to a method for detecting the wave-absorbing performance of carbon nanotube wave-absorbing materials based on reflection characteristics, which can calculate the reflection coefficients of carbon nanotube wave-absorbing materials with different proportions, and realize the wave-absorbing effect of carbon nanotubes Testing of absorbing properties of materials. Background technique [0002] With the rapid development of microwave engineering technology, stealth technology, as a typical application of electromagnetic wave absorption technology, has been widely used in key fields such as national defense, aerospace, and electronic information. Absorbing materials can effectively absorb or scatter and attenuate electromagnetic waves incident on their surfaces, and are the fastest-growing class of functional materials among stealth materials. Among them, carbon ...

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Application Information

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IPC IPC(8): G01N27/22G01N23/00
CPCG01N27/221G01N23/00
Inventor 宋国荣石雨宸吕炎张斌鹏杜晓宇何存富
Owner BEIJING UNIV OF TECH
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