Double-path resonance enhanced laser guidence breakdown spectral trace element analyser and method

A technology of laser-induced breakdown and trace elements, applied in the direction of material excitation analysis, etc., can solve the problems of expensive, low sensitivity, expensive lasers, etc., and achieve the effect of low cost and simple structure

Inactive Publication Date: 2007-11-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the technologies available in the world to reduce the detection limit of LIBS include: 1. Using double-pulse excitation mode: adopting double-pulse excitation mode requires a specially developed double-pulse laser, which is more expensive than single-pulse lasers, or using two-pulse A set of lasers, the system is also relatively expensive; 2. Using resonance-enhanced excitation mode and LIBS combined with laser-induced fluorescence (L

Method used

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  • Double-path resonance enhanced laser guidence breakdown spectral trace element analyser and method
  • Double-path resonance enhanced laser guidence breakdown spectral trace element analyser and method
  • Double-path resonance enhanced laser guidence breakdown spectral trace element analyser and method

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Embodiment 1

[0032] A dual-channel resonance enhanced laser-induced breakdown spectrum trace element analyzer as shown in Figure 1, in which Nd:YAG is an electro-optic Q-switched pulsed Nd:YAG laser (Beijing Times Zhuoyi, TurboLite), and its output wavelength is 1064nm, pulse width 10ns, repetition rate 5Hz, pulse energy about 200mJ; BS (beam splitter) is a beam splitter; RM1 and RM2 (reflection mirror) are mirrors; L1~L6 are lenses, and the focal length of each lens is: L1 , L2 and L3, f=10cm, L4 and L5, f=15cm, L6, f=25cm; PMT (photomultiplier tube) is a photomultiplier tube (Hamamatsu, CR114 type). The resonance light source is a laser-induced plasma light source of a single substance, compound or mixture, and the elements to be analyzed will be different depending on the element; the sample is the sample to be analyzed; the monochromator is a grating monochromator (Tianjin Tuopu, WDS-5 type ), the focal length is 50cm; the oscilloscope is a 250MHz digital storage oscilloscope (GW Inste...

Embodiment 2

[0043] Fig. 2 is a diagram of the test results of the test using the analyzer of Fig. 1 .

[0044] In order to observe the experimental effect of Na atom double-line double-channel resonance-enhanced laser-induced breakdown spectroscopy, the sample is selected as an aluminum alloy containing a small amount of Na atoms, and the resonance light source in the light source channel is a wood chip soaked in a supersaturated NaCl solution.

[0045] In the figure, the abscissa is the wavelength (in nanometers), and the ordinate is the luminous intensity.

[0046] Curve (a) in the figure: the sample channel is blocked, and only the light source channel is left, which is a straight line at this time, indicating that the strong laser-induced plasma resonance light radiation of the resonant light source will not be collected into the monochromator and cause background signals .

[0047]Curve (b) in the figure: the light source channel is blocked, only the sample channel remains, and this...

Embodiment 3

[0051] FIG. 3 is a graph showing test results of another test performed using the analyzer of FIG. 1. FIG.

[0052] In order to observe the experimental effect of dual-channel resonance enhanced laser-induced breakdown spectroscopy of Cu atoms and Zn atoms, the sample is selected as an aluminum alloy containing a small amount of Cu atoms and Zn atoms, and the resonance light source in the light source channel is a Cu-Zn binary alloy (yellow copper).

[0053] In the figure, the abscissa is the wavelength (in nanometers), and the ordinate is the luminous intensity.

[0054] Curve (a) in the figure: the sample channel is blocked, and only the light source channel is left, which is a straight line at this time, indicating that the strong laser-induced plasma resonance light radiation of the resonant light source will not be collected into the monochromator and cause background signals .

[0055] Curve (b) in the figure: the light source channel is blocked, only the sample channe...

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PUM

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Abstract

The invention discloses a double channel resonance enhancement laser induction penetrate spectrum trace element analyzer, which includes the laser, the monochromator, the photo detector, the oscilloscope and the computer, the states laser through the beam-splitting piece BS connects the sample channel and the photo source channel light signal; there is lens L1, the resonance photo source, coupling lens assembly L3 and L4 in turn installs on the photo source channel; there is reflector RM1, lens L2 in turn on the sample channel; the sample channel and photo source channel connect with the sample light signal, the sample through the light gather system connects the monochromator light signal, the monochromator connects the photo detector, the photo detector connects the oscillograph, the oscillograph connects the computer. The invention also discloses an analysis method of the double channel resonance enhancement laser induction penetrate spectrum trace element analyzer. The analyzer has simple structure and low cost, greatly enhanced the analysis sensitivity and reduced the examination limit.

Description

technical field [0001] The invention relates to the technical fields of applied atomic spectroscopy, applied laser spectroscopy and atomic spectral analysis, in particular to a dual-channel resonance-enhanced laser-induced breakdown spectrum trace element analyzer and method. Background technique [0002] Laser-Induced Breakdown Spectroscopy (LIBS) technology is a new type of atomic spectroscopic analysis technology, which uses a focused intense pulsed laser to directly excite the sample to be tested into plasma to emit light. Or ion spectroscopy to achieve elemental analysis of samples. Because it does not require complex sample preparation process, LIBS has the characteristics of fast and multi-element simultaneous analysis, and can realize field, real-time online and long-distance measurement in harsh environments, so it has received great attention and is widely used in various Elemental analysis of occasions. [0003] The detection limit of LIBS, that is, the lowest c...

Claims

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Application Information

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IPC IPC(8): G01N21/63
Inventor 李润华黎洪坤陈志江刘明何道航
Owner SOUTH CHINA UNIV OF TECH
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