Title :
Active sensing of spatial defects using a microwave imager
Author :
Tirkel, A.Z. ; Osborne, C.F.
Author_Institution :
Dept. of Appl. Phys., Chisholm Inst. of Technol., Caulfield East, Vic., Australia
Abstract :
The authors discuss microwave sounding of solid dielectric materials to detect and locate internal structural defects or density nonuniformities. The technique uses a reflection-type FM-CW radar system with a sweep range of 8-12 GHz and a sweep duration of 1-100 ms. This system allows for the detection of reflections from defects within the range of 0.1-3.0 m from the radar in most materials of relevance, e.g. fiberglass, timber, concrete, soil, etc. The predicted resolution of the system is 10/sup -3/ m in range, azimuth, and elevation in typical objects.<>
Keywords :
microwave imaging; nondestructive testing; radar applications; 0.1 to 3.0 m; 1 to 100 ms; 8 to 12 GHz; NDT; SHF; active sensing; azimuth; concrete; density nonuniformities; elevation; fiberglass; internal structural defects; microwave imager; microwave sounding; radar system; range; reflection-type FM-CW radar; reflections detection; resolution; soil; solid dielectric materials; spatial defects; sweep duration; timber; Calibration; Frequency; Instruments; Microwave technology; Optical reflection; Optical surface waves; Radar detection; Radar imaging; Radar scattering; Testing;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1990. AP-S. Merging Technologies for the 90's. Digest.
Conference_Location :
Dallas, TX, USA
DOI :
10.1109/APS.1990.115216
