The Spectral Emission Characteristics of Laser Induced Plasma on Tea Samples

ZHENG Peichao (郑培超); SHI Minjie (石珉杰); WANG Jinmei (王金梅); LIU Hongdi (刘红弟)

doi:10.1088/1009-0630/17/8/09

Plasma Science and Technology > 2015 > 17(8): 664-670. > DOI: 10.1088/1009-0630/17/8/09

ZHENG Peichao (郑培超), SHI Minjie (石珉杰), WANG Jinmei (王金梅), LIU Hongdi (刘红弟). The Spectral Emission Characteristics of Laser Induced Plasma on Tea Samples[J]. Plasma Science and Technology, 2015, 17(8): 664-670. DOI: 10.1088/1009-0630/17/8/09

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The Spectral Emission Characteristics of Laser Induced Plasma on Tea Samples

1Chongqing Municipal Level Key Laboratory of Photo-Electronic Information Sensing and Transmitting Technology, College of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China 2State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400065, China

Funds: supported by National Natural Science Foundation of China (No. 61205149), the Scientific and Technological Talents Training Project of Chongqing, China (No. CSTC2013kjrc-qnrc40002), the Scientific and Technological Project of Nan’an District (2011) and the Visiting Scholarship of State Key Laboratory of Power Transmission Equipment & System Security and New Technology at Chongqing University, China (No. 007DA10512714409)

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Received Date: January 26, 2015

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Abstract

Abstract

Laser induced breakdown spectroscopy (LIBS) provides a useful technique for food security as well as determining nutrition contents. In this paper, optical emission studies of laser induced plasma on commercial tea samples were carried out. The spectral intensities of Mg, Mn, Ca, Al, C and CN vibration bands varying with laser energy and the detection delay time of an intensified charge coupled device were studied. In addition, the relative concentrations of six microelements, i.e., Mg, Mn, Ca, Al, Na and K, were analyzed semi-quantitatively as well as H, for four kinds of tea samples. Moreover, the plasma parameters were explored, including electron temperature and electron number density. The electron temperature and electron number density were around 11000 K and 1017 cm?3, respectively. The results show that it is reasonable to consider the LIBS technique as a new method for analyzing the compositions of tea leaf samples.
- LIBS,
- tea leaves,
- relative concentration,
- plasma parameters

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References (34)

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