Optical microcrack sensor paints inspired by luminescent oxygen quenching phenomenon
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esearch Letter
Optical microcrack sensor paints inspired by luminescent oxygen quenching phenomenon Tsuyoshi Hyakutake, Hiroyuki Nitta, and Itaru Nishizaki, Innovative Materials Resources Research Centre, Public Works Research Institute, Tsukuba 305-8516, Japan Address all correspondence to Tsuyoshi Hyakutake at [email protected] (Received 28 January 2019; accepted 15 March 2019)
Abstract Luminescent oxygen sensor composed of platinum-porphyrin and a gas-permeable polymer binder was applied as an optical crack sensor paint for infrastructure. The sensor paints were designed as a three-layered structure in which the luminescent oxygen sensor layer was sandwiched between oxygen barrier layers. The sensor paints emitted intense luminescence under UV light irradiation, and the luminescence was efficiently quenched when a new crack formed on the concrete surface. Microcracks, which were
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