Laser-induced breakdown spectroscopy concentration extraction method for online monitoring of trace gas impurities
A technology of laser-induced breakdown and trace gas, which is applied in the field of atomic emission spectrometry, can solve the problems of reducing real-time analysis characteristics, large data volume, and high calculation cost, and achieves benefits for real-time output, reduced calculation cost, and avoids complex calculations Effect
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Embodiment 1
[0078] A laser-induced breakdown spectrum concentration extraction method for online monitoring of trace gas impurities, including laser-induced breakdown spectrum data collection, spectral preprocessing and characteristic peak intensity extraction, establishment of a special database for element characteristic lines, and element assignment of characteristic lines Identification, single-line calibration modeling and optimization, and rapid extraction and real-time output of concentration information for online monitoring of trace gas impurities involve the following steps:
[0079] 1) Collect spectral data to form a spectral data set;
[0080] 2) Preprocessing the spectral data set to extract element characteristic peak wavelengths and peak intensities;
[0081] 3) Establish a special database for elemental spectral lines;
[0082] 4) Match and calculate the wavelength information of the characteristic spectral lines with the special database of element spectral lines to confir...
Embodiment 2
[0086] This embodiment is further optimized on the basis of Embodiment 1. For better realization of the present invention, the following setting methods are especially adopted: said step 1) specifically includes the following steps:
[0087] 1.1) Use the laser-induced breakdown spectroscopy analysis system to continuously excite the gas component samples in the pipeline with pulsed laser, and collect the accumulated data of the plasma spectrum under the action of continuous pulsed laser;
[0088] 1.2) The collected spectral data are randomly and evenly divided into three groups, one group is used as a training set, the other group is used as a verification set, and the third group is a test set; wherein the training set data contains the spectral data of the target element in the maximum concentration range ; The validation set data and test set data are independent of the training set data.
Embodiment 3
[0090] This embodiment is further optimized on the basis of any of the above-mentioned embodiments. In order to better realize the present invention, the following setting methods are adopted in particular: the step 2) includes the following specific steps:
[0091] 2.1) Perform noise preprocessing on the training set, verification set and test set spectral data respectively;
[0092] 2.2) The noise filtering process adopts the BOX_ave function of the piecewise quasi-Gaussian fitting function, and the formula (1) is the BOX_ave function:
[0093] in:
[0094] 2.3) After step 2.2), further derivation preprocessing is performed on the data after the noise filtering of the training set, verification set and test set;
[0095] 2.4) Derivation preprocessing includes primary derivation and secondary derivation in turn, the functions used are formula (2-1) and formula (2-2), and formula (2) is the dev function;
[0096] 2.5) extraction step 2.4) after derivation element characteris...
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