Continuous background correction method based on interpolation method in laser-induced breakdown spectroscopy

A laser-induced breakdown and background correction technology, applied in thermal excitation analysis, material excitation analysis, instruments, etc., can solve problems such as background overestimation, lower signal-to-background ratio, inconvenient application of spectral bands, etc., to achieve the effect of improving performance

Active Publication Date: 2017-05-31
JIANGNAN UNIV
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Problems solved by technology

[0006] The Lorentz fitting method can only estimate the background of a certain spectral peak, and cannot be easily applied to the entire spectral band
When the polynomial fitting method and the adjacent point mean method estimate the continuous background, there may be background overestimation, which reduces the signal-to-background ratio

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  • Continuous background correction method based on interpolation method in laser-induced breakdown spectroscopy
  • Continuous background correction method based on interpolation method in laser-induced breakdown spectroscopy
  • Continuous background correction method based on interpolation method in laser-induced breakdown spectroscopy

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0029] A continuous background correction method for laser-induced breakdown spectroscopy based on interpolation, such as figure 1 shown, including the following steps:

[0030] Step S1, collecting laser-induced breakdown spectra with continuous background interference, obtaining all minimum points of spectral intensity values, and sorting the minimum points according to wavelength from small to large;

[0031] The specific implementation method is;

[0032] Assume that each data point of the spectral data is expressed as (λ(u), I(u)), where λ(u) represents the wavelength of the uth data point, and I(u) represents the spectral intensity of the uth data point; Use the adjacent point comparison method to obtain the minimum point; that is, when I(u)≤I(u-1), and I(u)≤I(u+1), the point is regarded as a minimum value point; traverse the spectral data of the entire...

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Abstract

The invention provides a continuous background correction method based on an interpolation method in laser-induced breakdown spectroscopy. The continuous background correction method comprises the following steps: S1, collecting a laser-induced breakdown spectrum with continuous background interference, acquiring all minimum value points of the spectral intensity value, and sorting the minimum value points according to an ascending sequence of the wavelength; S2, defining a window function; S3, sorting N minimum value points in the window function according to an ascending sequence of the spectral intensity value, and selecting and storing the previous M minimum value points; sliding the window function from a first minimum value point of spectral data, and sorting and selecting once after each sliding operation; after traversing all the minimum value points, using selected points as a new minimum value point set; S4, performing interpolation calculation on the new minimum value points, and using interpolation results for estimating continuous backgrounds; S5, according to the estimated continuous backgrounds, calculating signal-to-background ratios, and using the continuous background, estimated when the signal-to-background ratio is maximum, as a final continuous background estimation value. By the continuous background correction method, the performance of spectroscopic analysis can be improved.

Description

technical field [0001] The invention relates to the field of spectrum technology such as sample composition and content analysis, and specifically relates to a laser-induced breakdown spectrum continuous background correction method based on an interpolation method. Background technique [0002] Laser Induced Breakdown Spectroscopy (LIBS) is a spectral analysis technique, which has a wide range of applications in the field of sample composition and content analysis. LIBS technology is an analytical technique that uses laser light to irradiate the surface of the object to be measured to generate plasma to obtain material composition (qualitative analysis) and concentration (quantitative analysis). [0003] Compared with traditional spectral analysis methods, LIBS has the characteristics of real-time, rapid, non-destructive or minimally destructive detection. [0004] LIBS technology analyzes the emission spectra of atoms or ions, and under high-temperature plasma conditions,...

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Application Information

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IPC IPC(8): G01N21/71
CPCG01N21/71G01N2201/127
Inventor 朱启兵檀兵黄敏郭亚
Owner JIANGNAN UNIV
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