Practical testing of the method of defectoscopy of large-size radio-transparent shelters based on the method of radio-wave control

Аuthors

Larin A. A.

Kaluga-based instrument-making plant «Typhoon», Kaluga, Russian Federation

e-mail: larintema@ya.ru

Abstract

Various radio-transparent shelters (fairings) are used to protect the antennas of radar stations from environmental influences. The main electrotechnical requirement for these products is the requirement of radio transparency (introduction of minimum distortion of electromagnetic wave (EMW)) while maintaining strength and protective properties. In order to simplify the technological process, the main stages of such technological process (forming, coloring, removal from the matrix) are often performed manually, as a result of which there is a great influence of the human factor on the quality of the final product. Any violation in the technological process, resulting in a deviation in the design of the RPU wall, inevitably affects the radio transparency of the product. To solve the problem of control of radio-transparent shelters (RTU), the author has previously proposed a method of defectoscopy based on the radio-wave method of control. The proposed method together with radio transparency control (measurement of energy losses and EMV phase run-up in the RPU wall) allows to detect defects, estimate their size and shape. The paper describes the practical significance of the proposed method on the example of the results of defectoscopy of two large-sized fairings. The defectoscopy of the fairings based on the radio wave inspection method was performed under low-noise conditions. The radio wave inspection was performed by measuring the magnitude of energy loss and phase overrun with the use of time selection. A lifting device (crane beam) was used to move the fairing during the inspection process. Measuring instruments used in the workplace: measuring antennas P6-23A, vector circuit analyzer (VAC) Agilent PNA5224A. The step and number of inspection points were determined based on the fairing dimensions and the size of the inspection area. Two types of defects were detected in the fairing #1 defectoscopy. Opening the detected defect areas confirmed the presence of defects (delamination and internal joint). The defectoscopy of fairing No. 2 did not reveal any defects, but uneven distribution of binder on the skins caused by peculiarities of the production technology was found. The main stages of defect removal are shown.

Keywords:

radar station, fairing, radio-transparent shelter, electromagnetic wave, loss magnitude, transmission coefficient, phase raid, flaw detection, receptor model

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