@misc{oai:repo.qst.go.jp:00080550,
 author = {Nakanishi, Ryuzo and Oba, Hironori and Nakanishi, Ryuzo and Oba, Hironori},
 month = {Sep},
 note = {Laser induced breakdown spectroscopy (LIBS) offers a unique tool for in-situ and remote analysis of sample characteristics. Recently, LIBS has been used to evaluate the hardness of a material. This approach capitalizes on the findings that harder surface produce faster laser-induced plasma shockwave, eventually giving rise to higher density plasmas. This promotes excitation and ionization of neutral atoms. Thus, the ratio of the ionic to neutral emission intensity and the electron temperature from LIBS measurements allows us to evaluate the surface hardness. In the present study, we assess the potential use of emission lines from ambient gas instead of that from investigated elements to diagnose surface hardness using a portable fiber-optic LIBS device., 11th International Conference on Laser-Induced Breakdown Spectroscopy (LIBS2020)},
 title = {Fiber-optic LIBS for evaluation of surface hardness using ambient gas emission},
 year = {2020}
}