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http://dx.doi.org/10.5000/EESK.2002.6.4.023

Radar Probing of Concrete Specimens Using Frequency Domain Filtering  

임홍철 (연세대학교 건축공학과)
이윤식 (연세대학교 건축공학과)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.6, no.4, 2002 , pp. 23-29 More about this Journal
Abstract
Radar method can be effective in probing concrete structures damaged by earthquake. Data analysis is usually performed in time domain, by considering time delay of the wave due to the dielectric constant of concrete. In this study, improved data analysis has been performed using signal processing scheme of spectra analysis and filtering. Three antenna with 900MHz, 1㎓, and 1.5㎓ center frequency were used to detect a steel bar or delamination in specimens for obtaining data, Frequency spectrum was filtered in low pass, high pass, and band pass varying cutoff frequency with 1/3 octave in frequency domain. The most effective cutoff frequency for each frequency has been determined as the range for 2 octave lower to 1 octave higher and 2 octave lower to 1 octave lower. This result provided a basis in improving data analysis capability using frequency domain filtering.
Keywords
ground penetrating radar; concrete; frequency; filtering;
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