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Journal Articles

Detection of Simulated Fukushima Daiichi Fuel Debris Using a Remotely Operated Vehicle at the Naraha Test Facility

Nancekievill, M.*; Espinosa, J.*; Watson, S.*; Lennox, B.*; Jones, A.*; Joyce, M. J.*; Katakura, Junichi*; Okumura, Keisuke; Kamada, So*; Kato, Michio*; et al.

Sensors (Internet), 19(20), p.4602_1 - 4602_16, 2019/10

 Times Cited Count:1 Percentile:100(Chemistry, Analytical)

In order to contribute to fuel debris search at the Fukushima Daiichi Nuclear Power Station, we developed a system to search for submerged fuel debris by mounting a sonar on the remotely operated vehicle (ROV). The system can obtain 3D images of submerged fuel debris in real time by using the positioning system, depth sensor, and collected sonar data. As a demonstration test, a simulated fuel debris was installed at the bottom of the water tank facility at the Naraha Center for Remote Control Technology Development, and a 3D image was successfully obtained.

Journal Articles

Ultra-high-speed image signal accumulation sensor

Eto, Takeharu*; Son, D.*; Akino, Toshiaki*; Akino, Toshiro*; Nishi, Kenji*; Kureta, Masatoshi; Arai, Masatoshi

Sensors (Internet), 10(4), p.4100 - 4113, 2010/04

 Times Cited Count:7 Percentile:54.12(Chemistry, Analytical)

Accumulation and averaging of data is a standard technique applied to processing data with low signal-to-noise ratios (SNR), such as image signals captured in ultra-high-speed imaging. The authors propose an architecture layout of an ultra-high-speed image sensor capable of on-chip signal accumulation. The very high frame rate is enabled by employing an image sensor structure with a multi-folded CCD in each pixel which serves as in-situ image signal storage. The signal accumulation function is achieved by direct connection of the first and the last storage elements of the in-situ storage CCD. The in-situ storage image sensor with the signal accumulation function is named as Image Signal Accumulation Sensor (ISAS).

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