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Method for measuring content of powdery substantial elements based on dual pluses

A technology of element content and pulse laser, which is applied in the field of atomic emission spectroscopy measurement, can solve the problems of reducing the operating speed of the measurement system, complicating the system, and difficulty in realizing online measurement, etc., and achieve the goals of reducing the detection limit, strong optical signal, and increasing signal-to-noise ratio Effect

Inactive Publication Date: 2012-11-21
GUODIAN FUEL +1
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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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  • Method for measuring content of powdery substantial elements based on dual pluses
  • Method for measuring content of powdery substantial elements based on dual pluses
  • Method for measuring content of powdery substantial elements based on dual pluses

Examples

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Effect test

Embodiment

[0029] Taking the measurement of carbon element in coal by LIBS as an example, the measurement method of element content in powdery material based on double pulse laser is described.

[0030] 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 ...;

[0031] Table 1. Composition of standard coal samples

[0032]

[0033]

[0034]2) Select the first one from a group of calibration samples in step 1) and spread it on the transparent glass tray 4;

[0035] 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 position of the two pulse lasers ...

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Abstract

The invention discloses a method for measuring the content of powdery substantial elements based on dual pluses, characterized in that: a powdery sample is put on a transparent glass pallet, the two pulses are focused onto the bottom of the powder through the glass pallet, the first pulse generates plasmas at the bottom of the powder, the second pulse carries out subsequent heating on the generated plasmas, radiant light signals emitted by the plasmas pass through the glass pallet and are collected by a collecting lens arranged below the glass pallet, and the collected radiant light signals are transmitted to a spectrometer through optical fibers for analyzing. According to the invention, there in no need of further treatment of the powdery sample, thus the speed of on-line detection is raised; the measuring signal fluctuation caused by the unevenness of the powder layer surface is overcome, and the repeatability of the measurement is raised; in addition, the application of the dual pluses allows the plasmas to be more close to a local thermal equilibrium state, thus the raising of the measurement precision is benefited.

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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IPC IPC(8): G01N21/63
Inventor 尹运茂袁廷璧王哲李政
Owner GUODIAN FUEL
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