A Comparative Analysis of the Passive Electric Probe Detection and Spectrum Diagnosis of Laser-Induced Plasma
LIU Tong1, YANG Li-jun1, 2*, WANG Li-jun1, 2, WANG Lang-ping3
1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China 2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China 3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
Abstract：An approach to detecting laser-induced plasma using passive probe was brought up. The plasma of laser welding was studied by using a synchronous electric and spectral information acquisition system, the laser-induced plasma was detected by a passive electric probe and fiber spectrometer, the electrical signal was analyzed on the basis of the theory of plasma sheath, and the temperature of laser-induced plasma was calculated by using the method of relative spectral intensity. The analysis results from electrical signal and spectral one were compared. Calculation results of three kinds of surface circumstances, which were respectively coated by KF, TiO2 and without coating, were compared. The factors affecting the detection accuracy were studied. The results indicated that the results calculated by passive probe matched that by spectral signal basically, and the accuracy was affected by ions mass of the plasma. The designed passive electric probe can be used to reflect the continuous fluctuation of electron temperature of the generated plasma, and monitor the laser-induced plasma.
Key words：Passive probe;Spectrum diagnosis;Laser-induced plasma;Electron temperature
刘 桐1，杨立军1,2*，王立君1,2，王浪平3 . 激光等离子体无源电探针探测及光谱诊断的比较分析 [J]. 光谱学与光谱分析, 2014, 34(02): 289-292.
LIU Tong1, YANG Li-jun1, 2*, WANG Li-jun1, 2, WANG Lang-ping3 . A Comparative Analysis of the Passive Electric Probe Detection and Spectrum Diagnosis of Laser-Induced Plasma. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(02): 289-292.
[1] Sebestova H, Chmelickova H, Nozka L. Journal of Materials Engineering and Performance, 2012, 21(5): 764. [2] XIAO Shi-rong, CHEN Kai, CHEN Ji-min(肖诗荣，陈 凯，陈继民). Laser Technology(激光技术), 2001, 25(3): 238. [3] LOU Hong, HU Lun-ji, HUANG Shu-huai(骆 红，胡伦骥，黄树槐). Optics & Laser Technology (激光与光电子学进展), 1997, 373：1. [4] Liu Liming, Huang Ruisheng, Song Gang. IEEE Transactions on Plasma Science, 2008, 36(4)：1937. [5] Sibillano T, Rizzi D, Ancona A. Journal of Materials Processing Technology, 2012，!(212): 910. [6] Konuk A R, Aarts R G K M, Huis A J in’t Veld. Physics Procedia, 2011，(12)：744. [7] Ling Y M. Journal of Physics D: Applied Physics, 2006, 39(15): 3305. [8] Ursu C, Gurlui S, Focsa C. Nuclear Instruments and Methods in Physics Research B, 2009，(267): 446. [9] Bi Chao, Yang Lijun, Xu Wenhao. Journal of Physics D: Applied Physics, 2012，(45): 385202. [10] Bittencourt J A. Fundamentals of Plasma Physics. New York: Pergamon Press, 1986. [11] Mirapeix J, Cobo A, Conde O M. NDT&E International, 2006，(39): 356. [12] NIST Atomic Spectra Database. http://physics.nist.gov/PhysRefData/ASD/index.Html.
