Looking into concrete – usage of multiple frequency radar products to detect structural parameters and defects

Tronca, Guido; Proceq; Switzerland

Tronca, G.; Proceq SA; Switzerland
Lehner, S.; Proceq SA; Switzerland
Tsalicoglou, I.; Proceq SA; Switzerland

ID: ECNDT-0468-2018
Download: PDF
Session: Civil Infrastructure - GPR
Room: J1
Date: 2018-06-12
Time: 11:10 - 11:30

Traditional impulse Ground Penetrating Radar (GPR) systems use time-domain measurements of radar waves travelling in investigated objects. A Stepped Frequency Continuous Wave (SFCW) system collects data in the frequency domain and converts the data to time-domain data through digital processing. Until recently, the time-consuming calculations associated with the real-time Fourier transforms in SFCW systems limited their real-time usability in real-world applications. With the advent of faster processing capabilities, this limitation no longer applies to GPR.
Experimental work has been carried out on representative real-life concrete structures to provide a systematic comparison of a new SFCW GPR system with traditional impulse radar systems. In this paper, distinct evidence is given that SFCW technology combines the highest resolution in the detection of shallow targets with a very broad detection range. At the same time, the test system is characterized as very fast, both in terms of data display as well as data sharing.
The authors are concluding that industry and academic experts, civil engineers and contractors will be able to rely on a higher probability of detection and shorter time from their arrival to the construction site until the final inspection result is ready. Hence, by using SFCW test systems, the global construction industry is expected to gain higher safety standards and higher productivity levels.