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Laser-induced breakdown spectroscopy measurement method for element content of powdery substance

A laser-induced breakdown and element content technology, applied in the field of atomic emission spectrometry, can solve the problems of reducing the running speed of the measurement system, difficult to achieve online measurement, complex system, etc., to improve the detection limit, reduce the detection limit, strong optical signal Effect

Inactive Publication Date: 2014-07-16
GUODIAN FUEL +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pressing the powder makes the system more complicated, reduces the operating speed of the measurement system, and makes it difficult to achieve online measurement, which has become a bottleneck restricting the further development of LIBS technology.

Method used

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  • Laser-induced breakdown spectroscopy measurement method for element content of powdery substance
  • Laser-induced breakdown spectroscopy measurement method for element content of powdery substance

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Effect test

Embodiment

[0031] Taking the measurement of carbon in coal by LIBS as an example, the measurement method of laser-induced breakdown spectroscopy for powdery material components is described.

[0032] 1) Set the carbon element to be measured in the coal sample as the target element, first use ten kinds of coal samples with known mass concentrations of each element as calibration samples, and the mass concentrations of the main elements of each coal sample are shown in Table 1; The carbon concentration of the calibration sample is recorded as C 1 、C 2 、C 3 ...;

[0033] Table 1. Composition of standard coal samples

[0034]

[0035] 2) Select the first one from a group of calibration samples in step 1) and spread it on the transparent glass tray 4;

[0036] 3) Detection by laser-induced breakdown spectroscopy system: two pulse lasers are used, the first pulse laser 1 and the second pulse laser 2 are placed under the glass tray, and the positions of the two pulse lasers are not colli...

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Abstract

A laser-induced breakdown spectroscopy measurement method for the element content of powdery substances. In this method, the powder sample is placed on a transparent glass tray. Two pulsed laser beams are sequentially focused on the bottom layer of the powder through the lens and the glass tray. The first pulse ablates the powder substance Plasma is generated, and the second pulse heats the generated plasma. The radiated light signal emitted by the plasma passes through the glass tray and polarizer to be collected by the collection lens in turn, and is transmitted to the spectrometer through the optical fiber for analysis. This method not only greatly enhances the signal intensity by using a double-pulse laser, but also uses a polarizer to filter the continuous background radiation in the radiated light signal, improving the signal-to-noise ratio, thereby reducing the detection limit of the element measurement. In addition, the method does not need to process the powder sample for compression molding, which improves the speed of online detection.

Description

technical field [0001] The invention relates to a method for measuring the element content of a substance. Specifically, the method uses laser-induced breakdown spectroscopy (LIBS for short) to measure the element content, and belongs to the technical field of atomic emission spectrometry. Background technique [0002] LIBS is a brand-new material element analysis technique developed in the late 20th century. 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 technology has the advantages of low operating cost, fast measurement speed, high sensitivity, no or little sample pretreatment and multi-element measureme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/71
CPCG01N21/718
Inventor 王振东李雄威王哲李政
Owner GUODIAN FUEL
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