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Method for improving carbon content measuring accuracy in steel

A technology for measuring accuracy and carbon content, which is applied in the field of atomic emission spectrometry and can solve the problem that the measurement method cannot meet the requirements of on-site rapid measurement.

Active Publication Date: 2014-05-14
GUODIAN SCI & TECH RES INST
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Problems solved by technology

[0005] Aiming at the problem that the current existing measurement methods cannot satisfy the on-line rapid measurement, the present invention proposes a method of using LIBS technology to improve the measurement accuracy of carbon content in steel; using a laser in the ultraviolet band to improve the ablation efficiency of steel samples, and using carbon The atomic spectral line and the carbon molecular spectral line have two kinds of spectral line information, and after being corrected by the partial least square method (PLS), compared with the conventional LIBS that only uses the spectral line information of the carbon atomic spectral line, the measurement is greatly improved. precision and accuracy

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  • Method for improving carbon content measuring accuracy in steel
  • Method for improving carbon content measuring accuracy in steel
  • Method for improving carbon content measuring accuracy in steel

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Embodiment

[0059] 1) Table 1 lists 13 steel samples with known carbon content Z. In this example, the first 10 steel samples are selected as calibration samples, that is, n is equal to 10, and the other three are used as prediction samples. 13 kinds of iron and steel samples were tested using the laser-induced breakdown spectroscopy measurement system: such as figure 1 As shown, a 266nm pulsed laser 1 is used as the excitation light source, and the laser energy is set to 30mJ. The laser emitted from the laser is focused by the focusing lens 2 and then acts on the surface of the sample 3. Plasma is generated at the focal point, and the radiated optical signal generated by the plasma It is collected in real time through the focusing lens 4, the delay time is set to 1 μs, and the sampling gate width is 1 ms. After passing through the optical fiber 5 and processed by the spectrometer 6, it is converted into an electrical signal and collected by the computer 7 to obtain the spectrum of the sam...

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Abstract

The invention provides a method for improving carbon content measuring accuracy in steel, and belongs to the technical field of atomic emission spectroscopy measurement. The method comprises the following steps of puncturing a steel sample by using an ultraviolet band laser to obtain a characteristic spectrum, and fitting a function relationship of the intensities of a carbon atom spectral line and a carbon molecular spectra line and the carbon content; and correcting a residual error of the carbon content after fitting by using a partial least square method so as to obtain a calibration model of the carbon content. The method provided by the invention has the advantages that the ablation efficiency is improved by adopting the ultraviolet band laser, and a measuring signal is effectively strengthened; the information contained in a spectroscopy is fully utilized to establish the calibration model by correcting the residual error, and thus the detection limit of carbon in the steel is reduced and the measuring accuracy is improved.

Description

technical field [0001] The invention relates to a method for improving the measurement accuracy of carbon element content in steel based on laser-induced breakdown spectroscopy (Laser Induced Breakdown Spectroscopy, LIBS), and belongs to the technical field of atomic emission spectroscopy measurement. Background technique [0002] The carbon content in steel has a significant impact on the performance of steel. Therefore, the detection of carbon content in steel has always been one of the important detection technologies in metallurgical related industries. At present, the methods for measuring carbon content in steel mainly include infrared absorption method, gas capacity method, titration method, inductively coupled plasma (ICP) method, mass spectrometry, etc., but these methods require complex sample pretreatment, cannot directly detect steel samples, and cannot meet the requirements of on-site rapid measurement. [0003] The basic principle of LIBS technology is to focus...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/63
CPCG01N21/718
Inventor 袁廷璧侯宗余刘彬李佃李永生刘建民
Owner GUODIAN SCI & TECH RES INST
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