An improved asymmetric plasma spectroscopy method

By using an improved asymmetric plasma spectral analysis method, the relative radiation intensity ratio is replaced by the relative emission coefficient ratio. Combined with the Guldberg-Wagge dissociation equation, the measurement error problem of asymmetric plasma in arc welding is solved, and higher precision composition distribution measurement is achieved.

CN115078334BActive Publication Date: 2025-11-04KUSN BAOJIN LASER TAILOR WELDED
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Patent Information

Application Number
CN202210839761.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-07-18
Publication Date
2025-11-04
Estimated Expiration
2042-07-18

AI Technical Summary

Technical Problem

Existing standard temperature methods are difficult to accurately measure the temperature and composition of asymmetric plasmas, especially in arc welding processes, where the assumption of plasma symmetry and errors in the ratio of relative emission coefficients lead to inaccurate measurement results.

Method used

An improved asymmetric plasma spectral analysis method was adopted. By performing spectral measurements and image acquisition calibration on both sides of the plasma, the test material and protective gas were welded together, and the ratio of relative radiation intensity was calculated to replace the ratio of relative emission coefficient. The concentration result was obtained by combining the Guldberg-Wagge dissociation equation.

Benefits of technology

It improves the accuracy and range of asymmetric plasma composition distribution measurement, reduces reconstruction model error, is applicable to non-axisymmetric arc welding, and expands the applicability of the method, especially for concentration calculation when the relative emission coefficient at the plasma center is greater than 1.

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Abstract

The application discloses an improved asymmetric plasma spectrum analysis method, considers a diatomic dissociation process correction part standard temperature method curve result, and is higher in precision in diatomic gas calculation; adopts radiation intensity calculation instead of an emission coefficient, reduces a process of reconstructing an emission coefficient distribution model, is more convenient in calculation, avoids calculation deviation caused by reconstruction model error, simultaneously expands the application range of the method, and is not limited by an inverse transformation method; converts two relative emission coefficient curve intersection points into a relative emission coefficient ratio to determine plasma composition, and compensates for error caused by radiation intensity instead of the emission coefficient. Meanwhile, the concentration calculation can be extended to the case that the relative emission coefficient of the plasma center is greater than 1.
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