GPR has been proven effective for rebar structural condition inspections. However, most existing GPR inspections are limited to examine the single layer steel bars. Due to the complication of electromagnetic signal propagations, few studies have been performed on GPR inspecting multilayer steel rebar mesh structure. In this paper, a comprehensive investigation on multilayer rebar mesh structure inspection procedures and signal processing algorithms are conducted. For performance evaluations, simulations and field test data are adopted.
Jialei Tian, Xuehong Cao, Liangbao Jiao, Lei Zhang, and Tian Xia, "Study of GPR signal propagation and imaging of multilayer rebar mesh structure ," Proc. SPIE 10599, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XII, 105991A (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 08, 2018; Published: 27 March 2018); https://doi.org/10.1117/12.2296457.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon