Dependence of pulse energy on emission spectra in fiber-optic long-pulse LIBS

Matsumoto, Ayumu; Oba, Hironori; Toshimitsu, Masaaki; Akaoka, Katsuaki; Wakaida, Ikuo

no journal, , 

no abstracts in English

Consideration of material analysis using simulated fuel assembly heating test, 2; Study of the evaluation method by LIBS

Kawakami, Tomohiko*; Abe, Yuta; Spaziani, F.*; Nakano, Natsuko*; Nakagiri, Toshio

no journal, , 

no abstracts in English

Examination of application to material hardness evaluation method by simultaneous multi-spectrum measurement of Laser Induced Breakdown Spectroscopy (LIBS), 1; Evaluation of specimen for hardness measurement using LIBS

Abe, Yuta; Yamashita, Takuya; Kawakami, Tomohiko*

no journal, , 

no abstracts in English

Study on measurement technique for ZrBx composition and hardness based on Laser Induced Breakdown Spectroscopy (LIBS), 1; Preliminary consideration of measuring conditions

Abe, Yuta; Otaka, Masahiko; Okazaki, Kodai*; Kawakami, Tomohiko*; Oishi, Yuji*

no journal, , 

no abstracts in English

Applicability of metal boride hardness measurement using Laser-Induced Breakdown Spectroscopy (LIBS), 1; Simultaneous measuring of elemental composition information and hardness

Makuuchi, Etsuyo*; Nagayama, Sakiko*; Abe, Yuta; Okazaki, Kodai*; Kawakami, Tomohiko*; Oishi, Yuji*; Otaka, Masahiko

no journal, , 

no abstracts in English

Development of material hardness evaluation method by simultaneous multi-spectrum measurement of Laser Induced Breakdown Spectroscopy (LIBS), 1; Examination of in-situ hardness measurement method for metal boride

Abe, Yuta; Makuuchi, Etsuyo*; Nagayama, Sakiko*; Okazaki, Kodai*; Kawakami, Tomohiko*; Sun, Y.*; Oishi, Yuji*; Otaka, Masahiko

no journal, , 

no abstracts in English

Fiber-coupled LIBS analysis using a microchip laser in a harsh environment

Oba, Hironori; Akaoka, Katsuaki; Karino, Takahiro; Wakaida, Ikuo; Tamura, Koji*; Nakanishi, Ryuzo*; Sakamoto, Kan*; Taira, Takunori*

no journal, , 

Development of remote inspection and elemental analysis methods in a harsh radiation environment is required, such as inspection of the nuclear fuel debris at the bottom of the post-accident nuclear reactor (Tokyo Electric Power Company, Fukushima Daiichi Nuclear Power Plant). Laser-induced breakdown spectroscopy (LIBS) has been utilized as an effective qualitative and quantitative analytical method for elemental analysis. Inspecting the damaged reactor vessels requires a longer fiber-optic (FO) cable, which significantly attenuates the delivered laser energy by absorption and scattering in the fiber. We report on the first trial of our FO-LIBS system using the microchip laser (MCL) to identify and quantify elements in surrogate nuclear fuel debris under gamma irradiation, the results of trials on surrogate debris analysis, containing uranium oxide, using the MCL, and the results of 100 m-long fiber-delivered LIBS.

Radiation effects for a ceramics and a single crystal microchip of a laser-induced breakdown spectroscopy (LIBS) system for remote analysis

Tamura, Koji*; Nakanishi, Ryuzo*; Oba, Hironori; Wakaida, Ikuo

no journal, , 

Development of quick and remote analysis for severe accident reactor, 8-2; Analysis of simulated U-containing debris by fiber-delivered microchip LIBS

Oba, Hironori; Akaoka, Katsuaki; Karino, Takahiro; Wakaida, Ikuo; Ouchi, Atsushi*; Miura, Yusuke*; Eto, Yoshinori*; Sakamoto, Kan*

no journal, , 

no abstracts in English

Development of quick and remote analysis for severe accident reactor, 8-4; Development of acoustic-wave assisted microchip LIBS technique for simultaneous measurement of elemental mapping and surface recognition of nuclear fuel debris

Batsaikhan, M.; Oba, Hironori; Karino, Takahiro; Akaoka, Katsuaki; Wakaida, Ikuo

no journal, , 

組成分析方法及び組成分析装置、硬度算出方法及び硬度算出装置

阿部 雄太; 中桐 俊男

川上 智彦*

JP, 2018-199316  Patent licensing information  Patent publication (In Japanese)

【課題】金属を主成分とする材料中のO、Bの組成や材料の硬度を非接触で精密に算出できる。 【解決手段】図5の関係より、上記の方法で算出された(B/O)/M値のみからビッカース硬度を推定することは一般的には困難である。しかしながら、試料が図5におけるZを挟んだどちらの領域にあるかを判定することができれば、(B/O)/M値からビッカース硬度を推定することができる。前記の通り、図5におけるZよりも左側の領域はOの組成比が大きい場合であり、Zよりも右側の領域はBの組成比が大きな場合に対応する。このため、前記のO/M値、B/M値に応じてこの試料がどちらの領域に属するかを認識することができる。結局、(B/O)/M値から前記の一次式を用いてビッカース硬度を算出することができる。