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Takeuchi, Tomoaki; Otsuka, Noriaki; Nakano, Hiroko; Iida, Tatsuya*; Ozawa, Osamu*; Shibagaki, Taro*; Komanome, Hirohisa*; Tsuchiya, Kunihiko
QST-M-16; QST Takasaki Annual Report 2017, P. 67, 2019/03
no abstracts in English
Otsuka, Noriaki; Takeuchi, Tomoaki; Tsuchiya, Kunihiko; Shibagaki, Taro*; Komanome, Hirohisa*
Proceedings of 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2017) (Internet), 3 Pages, 2018/11
no abstracts in English
Takeuchi, Tomoaki; Shibata, Hiroshi; Hanakawa, Hiroki; Uehara, Toshiaki*; Ueno, Shunji*; Tsuchiya, Kunihiko; Kumahara, Hajime*; Shibagaki, Taro*; Komanome, Hirohisa*
JAEA-Technology 2017-026, 26 Pages, 2018/02
JAEA-Technology-2017-026.pdf:4.0MB
Under severe accidents, high-integrity transmission techniques are necessary so as to monitor the situation of the nuclear power plant. In this study, effects of gamma irradiation up to 10
Gy on properties of optical devices were evaluated toward the development of a radiation-resistant in-water wireless transmission system using visible light. After the irradiation, for the LEDs, the total luminous flux decreased and the browning of resin lenses occurred. Meanwhile, the current-voltage characteristics hardly changed. For the PDs, the light sensitivity decreased and the browning of resin window occurred. The dark currents of PDs did not become large enough to adversely affect transmission. These results indicated that both the decreases of the total luminous flux of the LEDs and the light sensitivity of the PDs were mainly caused by not the degradation of the semiconductor parts but the browning of the resin parts by the irradiation. In addition, basic decrease behaviors of light transmission of several different types of glasses by gamma irradiation were also obtained so as to select the suitable optical windows and filters for the developing radiation-resistant in-water wireless transmission system.
Yatsuzuka, Junji*; Shibagaki, Taro*; Otsuka, Noriaki; Takeuchi, Tomoaki; Tsuchiya, Kunihiko; Komanome, Hirohisa*
Bijon Gijutsu No Jitsuriyo Wakushoppu (ViEW 2017) Koen Yoshishu (USB Flash Drive), 6 Pages, 2017/12
no abstracts in English
Takeuchi, Tomoaki; Shibata, Hiroshi; Otsuka, Noriaki; Uehara, Toshiaki; Tsuchiya, Kunihiko; Shibagaki, Taro*; Komanome, Hirohisa*
IEEE Transactions on Nuclear Science, 63(5), p.2698 - 2702, 2016/10
Times Cited Count：3 Percentile：28.28(Engineering, Electrical & Electronic)In response to the lesson of the accident at the Fukushima Dai-ichi Nuclear Power Plant, we started a development of a radiation-resistant in-water wireless transmission system. In this study, capability of light emitting diodes (LED) and photo diodes (PD) as light emitting and receiving devices was researched. Results of irradiation tests of LEDs and PDs up to 1 MGy indicated a main cause of the degradation of the optical performances of the diodes was not the radiation damage at the semiconductor parts but the coloring of the resin parts. Assuming that the use of the candidate LED and PD, the PD's output current generated by the emission light of the LED at five meters away in water was estimated to be detectable intensity even considering the effects of the absorption of the light by water and the increased dark current by 1 MGy irradiation. Therefore, a radiation resistant in-water transmission system can be constructed using LEDs and PDs in principle.
Takeuchi, Tomoaki; Otsuka, Noriaki; Shibagaki, Taro*; Komanome, Hirohisa*; Ueno, Shunji*; Tsuchiya, Kunihiko
Nihon Hozen Gakkai Dai-13-Kai Gakujutsu Koenkai Yoshishu, p.379 - 386, 2016/07
no abstracts in English
Otsuka, Noriaki; Takeuchi, Tomoaki; Shibagaki, Taro*; Komanome, Hiroshi*; Tsuchiya, Kunihiko
Proceedings of Decommissioning and Remote Systems 2016 (D&RS 2016) (CD-ROM), p.277 - 278, 2016/07
no abstracts in English
-ray degradation of light emitting and receiving devices for in-water wireless transmission systemShibata, Hiroshi; Hanakawa, Hiroki; Takeuchi, Tomoaki; Ueno, Shunji; Uehara, Toshiaki; Tsuchiya, Kunihiko; Araki, Masanori; Shibagaki, Taro*; Komanome, Hirohisa*
no journal, ,
no abstracts in English
Takeuchi, Tomoaki; Shibata, Hiroshi; Ueno, Shunji; Uehara, Toshiaki; Tsuchiya, Kunihiko; Shibagaki, Taro*; Komanome, Hirohisa*
no journal, ,
no abstracts in English
Takeuchi, Tomoaki; Otsuka, Noriaki; Nakano, Hiroko; Shibagaki, Taro*; Komanome, Hirohisa*; Tsuchiya, Kunihiko
no journal, ,
Considering that reactor buildings could be filled with water under severe accidents, a development of the wireless transmission system in water is necessary. In this study, transmission method using visible light was adopted because of its relatively lower attenuation rate and higher transmission rate in water. In the designed transmission system, two-dimensional transmission devices were adopted. LEDs arranged in a two-dimensional array and a camera using a CMOS image sensor, that is like a 2D aggregation of PDs, were used as the light emission and receiving devices, respectively. Moreover, both of pattern and flicker signals can be simultaneously emitted. To confirm the environmental robustness, the in-water transmission tests using the two-dimensional transmission devices were performed with and without air bubbles. The results indicated the pattern signals were more easily influenced than the flicker signals by the air bubbles. In addition, surface mounting LEDs were more suitable than bullet-type LEDs because of their good distinctiveness of the light spots from each LED. On the other hand, irradiation tests for the LEDs were performed. The results again indicated surface mounting LEDs were advantageous because the decrease rates of the total luminous flux with absorbed dose were lower than that of the bullet-type LEDs.
-ray conditionOtsuka, Noriaki; Takeuchi, Tomoaki; Tsuchiya, Kunihiko; Shibagaki, Taro*; Komanome, Hirohisa*
no journal, ,
no abstracts in English
Otsuka, Noriaki; Takeuchi, Tomoaki; Tsuchiya, Kunihiko; Shibagaki, Taro*; Komanome, Hirohisa*
no journal, ,
no abstracts in English
Otsuka, Noriaki; Takeuchi, Tomoaki; Tsuchiya, Kunihiko; Shibagaki, Taro*; Komanome, Hirohisa*
no journal, ,
no abstracts in English
Takeuchi, Tomoaki; Sawa, Takao*; Shibagaki, Taro*; Kozawa, Yusuke*; Goto, Shimpei*
no journal, ,
no abstracts in English
武内 伴照; 上野 俊二; 柴田 裕司
柴垣 太郎*; 野沢 省吾*
JP, 2014-195743 Patent licensing information Patent publication (In Japanese)
【課題】光無線通信において、通信状態が変化した場合においても、受信側から送信側への情報伝送速度の変更指示を要さずに、安定したデータの通信を可能にする。 【解決手段】送信側には、情報を2次元コードに対応した光パターンで表示可能な表示手段と、送信情報を光パターンで表示させるための2次元符号化データに変換する手段と、送信情報を時系列データに変換する手段と、光パターンが時系列データに基づいて強度変調されるように、2次元符号化データと時系列データとを重畳する手段と、そのデータに基づいて前記表示手段を駆動する手段と、を有する送信装置100を設ける。受信側には、表示手段を撮影するカメラ210と、カメラが撮影した映像から光パターンを読取って送信情報を復元する手段と、光パターンの強度変調状態から送信情報を復元する手段と、を有する受信装置200を設ける。
大塚 紀彰; 武内 伴照
柴垣 太郎*; 野沢 省吾*; 八束 純司*
JP, 2017-057879 Patent licensing information Patent publication (In Japanese)
【課題】情報を2次元コードに対応した発光パターンで表示可能な表示面をそれぞれ有する複数の送信装置と、複数の送信装置の表示面を撮影するカメラおよびその映像から発光パターンを抽出する抽出部を有する受信装置と、を備える光無線通信システムにおいて、通信状態が変化した場合にでも、複数の送信装置から送信される2次元コードを確実且つ効率よく取得できるようにする。 【解決手段】カメラの画面に対し、送信装置毎にその表示面が含まれる必要十分な領域を設定する。そして、表示面の作動のタイミング、期間および周期に対応して、その設定された領域に対し300F/Sの高速度の画像取り込み処理を実行して光パターンを抽出し、情報復元手段に転送するための画像取り込み処理を行う。
武内 伴照
柴垣 太郎*; 駒野目 裕久*; 澤 隆雄*; 後藤 慎平*; 小澤 佑介*
JP, 2022-057100 Patent licensing information Patent publication (In Japanese)
【課題】イメージセンサの飽和レベルを超える強さを持つ光の輝度レベルを検出するための、高輝度光源からの光の輝度レベルを検出する方法、装置及び光通信システムを提供する。 【解決手段】方法は、第1の発光素子11からの光をイメージセンサ13で受光するステップと、第1の発光素子11からの光を受光した受光領域のうち、受光量がイメージセンサ13の飽和レベルより大きい第1の飽和領域を検出するステップと、第1の発光素子11からの光の輝度レベルを表す第1の検出値として、第1の飽和領域の大きさを決定するステップと、を含む。
武内 伴照
柴垣 太郎*; 駒野目 裕久*; 澤 隆雄*; 後藤 慎平*; 小澤 佑介*
JP, PCT/JP2023/012703 Patent licensing information
The present invention detects the luminance level of light having an intensity exceeding the saturation level of an image sensor. Provided is a method that can be used for detecting the luminance level of light from a high-luminance light source. The method comprises: a step for receiving light from a first light emitting element by means of an image sensor; a step for detecting, in a light reception region in which the light from the first light emitting element has been received, a first saturation region in which the amount of the received light is greater than a saturation level of the image sensor; and a step for determining the size of the first saturation region as a first detection value that represents the luminance level of the light from the first light emitting element.
武内 伴照
柴垣 太郎*; 駒野目 裕久*; 澤 隆雄*; 後藤 慎平*; 小澤 佑介*
JP, PCT/JP2023/012703 Patent licensing information
The present invention detects the luminance level of light having an intensity exceeding the saturation level of an image sensor. Provided is a method that can be used for detecting the luminance level of light from a high-luminance light source. The method comprises: a step for receiving light from a first light emitting element by means of an image sensor; a step for detecting, in a light reception region in which the light from the first light emitting element has been received, a first saturation region in which the amount of the received light is greater than a saturation level of the image sensor; and a step for determining the size of the first saturation region as a first detection value that represents the luminance level of the light from the first light emitting element.
武内 伴照
柴垣 太郎*; 駒野目 裕久*; 澤 隆雄*; 後藤 慎平*; 小澤 佑介*
JP, PCT/JP2023/012703 Patent licensing information
The present invention detects the luminance level of light having an intensity exceeding the saturation level of an image sensor. Provided is a method that can be used for detecting the luminance level of light from a high-luminance light source. The method comprises: a step for receiving light from a first light emitting element by means of an image sensor; a step for detecting, in a light reception region in which the light from the first light emitting element has been received, a first saturation region in which the amount of the received light is greater than a saturation level of the image sensor; and a step for determining the size of the first saturation region as a first detection value that represents the luminance level of the light from the first light emitting element.
