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

A technology of element content and pulsed laser, which is applied in the field of atomic emission spectrometry, 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 goal of reducing the detection limit, strong optical signal, and increasing the signal-to-noise ratio Effect

Inactive Publication Date: 2014-07-16
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

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Embodiment

[0029] Taking the use of LIBS to measure carbon elements in coal as an example, the method for measuring the element content of powdery substances based on dual-pulse lasers is described.

[0030] 1) Set the carbon element to be measured in the coal sample as the target element. First, use eleven coal samples with known mass concentrations of each element as the calibration sample. The mass concentrations of the main elements of each coal sample are shown in Table 1; The carbon element concentration of each calibration sample is recorded as C 1 , C 2 , C 3 ...

[0031] Table 1. Standard coal sample composition

[0032]

[0033]

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

[0035] 3) Use a laser-induced breakdown spectroscopy system for detection: use two pulsed lasers, place the first pulsed laser 1 and the second pulsed laser 2 under the glass tray, and the positions of the two pulsed lasers are collin...

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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 content of material elements. Specifically, the method uses laser induced breakdown spectroscopy (LIBS for short) to measure the content of elements, and belongs to the technical field of atomic emission spectrometry. Background technique [0002] LIBS is a new material element analysis technology developed in the late 20th century. The working principle of LIBS is: under the action of a strong laser pulse, the material on the sample surface is excited into plasma and decays rapidly. During the decay process, photons of a specific frequency are radiated to generate characteristic spectral lines. The frequency and intensity information contains the analysis object. Type and concentration information of the element. LIBS technology has the advantages of low operating cost, fast measurement speed, high sensitivity, no or little sample pretreatment and multi-element measurement, and no radiation hazard. It ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/63
Inventor 尹运茂袁廷璧王哲李政
Owner GUODIAN FUEL
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