Cambered surface electrode discharging-based laser-induced breakdown spectroscopy detection system

A laser-induced breakdown and arc-surface electrode technology, applied in the field of laser-induced breakdown spectroscopy, can solve the problems of small effective discharge area of ​​spherical electrodes, insufficient enhancement effect, insufficient signal stability, etc., to improve detection limit and arc stability , the effect of improving stability

Active Publication Date: 2014-04-09
TSINGHUA UNIV
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Problems solved by technology

These methods inject electrical energy into the plasma through an arc, which can significantly increase the intensity of the LIBS signal, but because the arc generated by the discharge is very unstable, and the effective discharge area of ​​the spherical electrode used is small, resulting in insufficient signal stability and insufficient enhancement effect. At the same time, the relative positions of the two electrodes need to be fixed separately, which brings inconvenience to the actual operation

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  • Cambered surface electrode discharging-based laser-induced breakdown spectroscopy detection system
  • Cambered surface electrode discharging-based laser-induced breakdown spectroscopy detection system
  • Cambered surface electrode discharging-based laser-induced breakdown spectroscopy detection system

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Embodiment

[0022] Taking the standard coal sample ZBM098 as an example, the spectral signals of carbon elements obtained by conventional LIBS, spherical electrode enhanced LIBS, and arc surface electrode discharge LIBS according to the present invention are compared. Before the experiment, the coal samples were pressed into briquettes with a tablet press as the samples to be tested.

[0023] An ND:YAG pulsed laser is used, the laser wavelength is 532nm, the laser energy is set to 35mJ, the focal length of the focusing lens is 20cm, and the focal point is located 4mm below the surface of the sample to be tested. The spectrometer starts acquiring signals 1 μs after the laser pulse is emitted. The diameter Φ of the cylindrical cavity is 3 mm, and the depth H is 1.5 mm. The voltage of the high-voltage DC power supply is set to 7.5kV, and the capacitance is 20nF. The spherical electrode used for comparison has a diameter of 3mm, the distance between two electrodes is 3mm, and the electrode ...

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Abstract

The invention discloses a cambered surface electrode discharging-based laser-induced breakdown spectroscopy detection system and belongs to the field of laser-induced breakdown spectroscopy. The cambered surface electrode discharging-based laser-induced breakdown spectroscopy detection system is characterized in that a cambered surface electrode discharging device is used based on the conventional laser-induced breakdown spectroscopy system. The cambered surface electrode discharging device comprises a high voltage supply, a capacitance, a high voltage cable, an insulating layer and two cambered surface electrodes. Through electrode discharging, a large amount of electric energy is poured into laser-induced plasmas so that a spectral signal is improved obviously, a cylindrical cavity formed from the cambered surfaces and insulating layers of the cambered surface electrodes can restrain a plasma spatial form, and a plasma temperature and electron density are improved and thus the spectral signal has larger intensity and better stability. The cambered surface electrode discharging-based laser-induced breakdown spectroscopy detection system is simple and reliable and has a low cost and good practicality.

Description

technical field [0001] The invention relates to a laser-induced breakdown spectrum detection system, in particular to a laser-induced breakdown spectrum detection system based on arc surface electrode discharge to improve the quality of spectral signals, and belongs to the technical field of laser-induced breakdown spectrum. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS) is a brand-new material element analysis technique developed in the late 20th century, and it is a typical atomic emission spectroscopy measurement technique. The working principle of LIBS is: under the action of strong laser pulses, the material on the surface of the sample is excited to become plasma and decays rapidly. During the decay process, photons of specific frequency are radiated and characteristic spectral lines are generated. The frequency and intensity information of the sample contains the analysis object. The element type and concentration information. LIBS technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/63
Inventor 王哲侯宗余袁廷璧李政
Owner TSINGHUA UNIV
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