抄録
This document describes a feasibility study for detecting crack of concrete by using Ka-band (from 26GHz to 40GHz) full polarized synthetic aperture radar (SAR). Recently, it becomes important to detect cracks for checking the damage of infrastructure and used houses. If we need transmissive image through the wallpaper, radio-frequency sensor is an effective solution. We conducted an experiment in radio-frequency anechoic chamber to detect the crack by using full polarized SAR system. The system mainly consisted from a vector network analyzer (VNA), a RF-switch, four horn antennas and an actuator. The four antennas obtained full polarized (VV, VH, HV, HH) SAR imagery. In our experiment, VH or HV polarization is effective for the crack along with the radar line of sight (LOS). On the other hand, VV polarization is effective for the crack across LOS. The experiment shows effectiveness of polarized SAR-based monitoring system.
