Automatic estimation of varying continuum background emission in laser-induced breakdown spectroscopy

aThe wavelet threshold denoising method is an effective noise suppression approach for noisy laser-induced breakdown spectroscopy spectrum. The wavelet threshold denoising method is influenced by several key issues such as the choice of wavelet, the choice of decomposition level, threshold selection, and the choice of thresholding functions. In this paper, the double threshold optimization models of semi-soft thresholding function are established firstly. Next, on the basis of grey relational analysis and Euclid closeness of fuzzy theory, a method of amending the double thresholds of semi-soft thresholding function is put forward. The performance of the proposed method is verified by analysis of both synthetic and observed signals. The limit of detection values are reduced by more than 50% and the signal to noise ratios are improved by a factor of two by using the proposed method.

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“…42 Moreover, the varying continuum background correction is accomplished by Lanxiang Sun's method. 43 PE is calculated by using…”

Section: Resultsmentioning

confidence: 99%

Wavelet denoising method for laser-induced breakdown spectroscopy

Zhang

Sun

Huang

et al. 2013

J. Anal. At. Spectrom.

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“…26 Moreover, the varying continuum background correction was accomplished by Lanxiang Sun's method. 27 As shown in Fig. 10, the processed results of the estimated number and positions of individual peaks were obtained by CSWT.…”

Section: Resultsmentioning

confidence: 99%

A Method for Resolving Overlapped Peaks in Laser-Induced Breakdown Spectroscopy (LIBS)

Zhang

Sun

et al. 2013

Appl Spectrosc

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Spectral peak overlapping is a basic problem in analytical data processing of laser-induced breakdown spectroscopy (LIBS). Curve fitting is the typical method of resolving overlapped peaks. For preventing ambiguous fitting, appropriate initial values must be known. The aim of this work was to present a method that could be used to determine appropriate initial values of the curve-fitting method by using fractional differential theory. According to the variation of characteristic points of Lorentzian peaks at different fractional differential orders, parameter estimators were obtained that were used to calculate the initial values of the curve-fitting method. As it is a widely used optimization method, the LevenbergMarquardt method was used in curve fitting. Simulation and LIBS experimental results proved that the proposed method of the initial value estimation can effectively resolve the overlapped peaks in LIBS data processing.

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“…This method can effectively improve the quality of the signals and the accuracy of the regression model. Sun et al [25] presented a method that can automatically estimate and correct varying continuum background emission. Simulations and experiments were made to successfully prove the efficiency of the method.…”

Section: Correction and Removal Of Continuum Backgroundmentioning

confidence: 99%

Calibration Methods of Laser-Induced Breakdown Spectroscopy

Fu¹,

Jia²,

Wang³

et al. 2018

Calibration and Validation of Analytical Methods - A Sampling of Current Approaches

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Laser-induced breakdown spectroscopy (LIBS) has gained great attention over the past two decades due to its many advantages, such as needless sample preparation, capability of remote measurement and fast multielement simultaneous analysis. However, because of its inherent uncertainty features of plasma, it is still a big challenge for LIBS community worldwide to realize high sensitivity and accurate quantitative analysis. Currently, many chemometric analytical methods have been applied to LIBS calibration analysis, including univariate regression, multivariate regression, principal component regression (PCR), partial least squares regression (PLSR) and so on. In addition, appropriate sample and spectral pretreatment can effectively improve the analytical performance (i.e., limit of detection (LOD), accuracy and repeatability) of LIBS. In this chapter, we briefly summarize the progress of these calibration methods and their applications on LIBS and provide our recommendations.

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Automatic estimation of varying continuum background emission in laser-induced breakdown spectroscopy

Cited by 67 publications

References 24 publications

Wavelet denoising method for laser-induced breakdown spectroscopy

Wavelet denoising method for laser-induced breakdown spectroscopy

A Method for Resolving Overlapped Peaks in Laser-Induced Breakdown Spectroscopy (LIBS)

Calibration Methods of Laser-Induced Breakdown Spectroscopy

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