10.14489/td.2017.01.pp.016-023

2017, 01 January

DOI: 10.14489/td.2017.01.pp.016-023

Ivashov S. I., Chizh M. A., Zhuravlev A. V., Razevig V. V., Mil’yachenko A. A., Kologov A. V.
THE CHOICE OF MICROWAVE FREQUENCY BAND IN THE DIAGNOSIS OF COMPOSITES DETAILS WITH USE OF HOLOGRAPHIC RADAR
(pp. 16-23)

Abstract. There is a burst of applications of composite materials and structures in aerospace industry in recent years. The composites have many advantages over traditional metal alloys. They have, as a rule, better strength/weight ratio, withstand to unfavorable weather conditions and aggressive environments. Also, corrosion processes, which often damage the metal articles, do not affect them. Traditional methods of ultrasonic diagnostics are ineffective for porous composite such as polyurethane foam insulation or silicate fiber tiles, used in American Space Shuttle and Russian spacecraft “Buran”, as well as for honeycomb fiberglass construction details due to high levels of acoustic wave attenuation in them. In these cases, microwave holographic subsurface imaging can be a reasonable alternative to ultrasonic method. A specially designed test setup was created that includes a vector network analyzer for generating and receiving signals and an electromechanical scanner for moving the studied samples. Operational frequency band of the vector network analyzer provides opportunity to carry out experiments in the broad range from 10 MHz to 24 GHz. Specialized software was developed for the registration and reconstruction of complex multi-frequency holograms. Several composite samples were tested in the setup at different frequency ranges to study the frequency influence on the obtained results. All samples had preliminary produced defects. Comparison of the samples testing results and the defects maps showed that they were in a good coincidence.

Keywords: dielectric composite materials, holographic subsurface radar, microwave imaging, nondestructive testing.

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S. I. Ivashov, M. A. Chizh, A. V. Zhuravlev, V. V. Razevig (Bauman Moscow State Technical University, Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.
A. A. Mil’yachenko, A. V. Kologov (Federal State Unitary Enterprise “Scientific Production Association “Tekhnomash”, Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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