Effect of scanning direction on amplitude of reflected pulse radar from steel bar

Abstract

The relationship between the amplitude of the reflected response of Ground-Penetrating Radar pulse and the scanning angle is experimentally investigated. It is found that amplitude of a reflected radar wave increases when the size of rebar increases and changes with scanning direction. The amplitude of reflected radar wave from a rebar with specific size is maximized if scanning direction is perpendicular with the axis of reinforcing bar. Empirical formulation for the relationship between size of rebar and amplitude of reflected wave is proposed based on the experimental result. The method can be modified and applied for the detection of reinforcement arrangement as well as to measure the size of reinforcement in the actual reinforced concrete structure. © 2010 Macmillan Publishers Ltd.