Study on the LTE and its effect on the measurement accuracy in calibration-free laser-induced breakdown spectroscopy

Qiaoling Chen; Weidong Zhou; Kexue Li; Jingming Long

doi:10.1117/12.837757

1 December 2009 Study on the LTE and its effect on the measurement accuracy in calibration-free laser-induced breakdown spectroscopy

Qiaoling Chen, Weidong Zhou, Kexue Li, Jingming Long

Author Affiliations +

Proceedings Volume 7507, 2009 International Conference on Optical Instruments and Technology: Optical Trapping and Microscopic Imaging; 75070E (2009) https://doi.org/10.1117/12.837757
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

Abstract

Calibration-Free Laser-Induced Breakdown Spectroscopy (CF-LIBS) is a promising approach for quantitative analysis without using certified samples and calibration curves. It can overcome the matrix effects. However this method is based on the hypothesis that in the actual temporal observation window the plasma is in local thermal equilibrium (LTE). In this paper, the plasma is generated using a Q-switched Nd:YAG laser hits on certified soil samples in air at atmospheric pressure. The local values of the parameters that characterize laser induced plasma (temperature, electron density) have been derived from the recorded spectra with different observation window. The electron density in the plasma at different time delay after laser firing has been investigated in detail, which can be served as a criterion of the existence of the LTE. As a result, an appropriate time delay is obtained. By comparing the temperatures deduced from the spectroscopy line intensity of neutral atom and ion emissions at different gate width, the optimized time duration which satisfies the LTE is obtained. Finally, we analyze the importance of observation window and its effect on the accuracy and precision of this method.

Citation Download Citation

Qiaoling Chen, Weidong Zhou, Kexue Li, and Jingming Long "Study on the LTE and its effect on the measurement accuracy in calibration-free laser-induced breakdown spectroscopy", Proc. SPIE 7507, 2009 International Conference on Optical Instruments and Technology: Optical Trapping and Microscopic Imaging, 75070E (1 December 2009); https://doi.org/10.1117/12.837757

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