Here we will propose the conceptual new idea of the inspection of concrete bridge using smart materials and mobile IoT system. We apply opal photonic crystal film to detect cracks on concrete infrastructures. High quality opal photonic crystal films were coated on black color PET sheet over 1000 cm2 area. The opal film sheet was cut and adhered to concrete or mortar test pieces by epoxy resin. In the tensile test, the structural color of the opal sheet was changed when the crack was formed. As a demonstration, we have installated the opal film sheet on the wall of the concrete bridge. Our final purpose is the color change will be recorded by portable CCD devices, and send to expert via IoT network.
Hiroshi Fudouzi, Koichi Tsuchiya, Shin-ichi Todoroki, Tsuyoshi Hyakutake, Hiroyuki Nitta, Itaru Nishizaki, Yoshikazu Tanaka, and Takao Ohya, "Smart photonic coating for civil engineering field: for a future inspection technology on concrete bridge," Proc. SPIE 10168, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2017, 1016820 (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 29, 2017; Published: 12 April 2017); https://doi.org/10.1117/12.2259822.
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