Development of microearthquake response detection by optical fiber seismic vibrometer with a water tank and a specially designed robotic system

Nishimura, Akihiko  ; Morishita, Hideki*; Yamada, Tomonori; Yoshida, Minoru*; Tagawa, Akihiro 

For decommissioning of the Fukushima Daiichi Nuclear Power Station, installation of an optical fiber seismic vibrometer using a specially designed robotic system was demonstrated. A water tank with 4.5m diameter and5m depth was used as a demo plant of tank type critical assembly. Micro earthquake response of a water tank was detected by the optical fiber seismic vibrometer. Vibration characteristic of the window of the water tank was monitored by laser Doppler interferometer.