高重频光纤激光诱导击穿光谱对TC4钛合金的 免定标分析

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关键词：激光诱导击穿光谱；光纤激光器；定量分析；自吸收效应；自由定标法中图分类号：0657.3 文献标识码：Adoi：10.37188/OPE.20253319.3032 CSTR：32169.14.OPE.20253319.3032

Abstract： Traditional laser-induced breakdown spectroscopy （LIBS） employing low-repetition-rate solidstate lasers exhibits insuficient stability during extended continuous operation. Although fiber-laser-induced breakdown spectroscopy （FL-LIBS） offers superior long-term stability，its high repetition rate poses challenges for conventional quantitative approaches，which typically rely on time-integrated spectra and calibration with reference samples.To remove dependence on reference standards，a high-speed，high-repetition-frequency triggered-gating system was implemented on an FL-LIBS platform to capture transient plasma spectra. A calibration-free quantitative analysis algorithm was developed，and the Internal Reference Self-absorption Correction （IRSAC） method was improved to compensate for spectral self-absorption，thereby enhancing the accuracy ofcalibration-free quantification.Experimental results for TC4 titanium alloy indicate total analysis distance errors （DE） ranging from 0.883% to 3.928% （mass fraction）， corresponding to reductions of 16.879% to 26.597% （mass fraction） relative to uncorrected self-absorption.These findings demonstrate that high-accuracy calibration-free quantitative analysis can be achieved under high-repetition-frequency fiber laser ablation，ofering a viable approach for LIBS systems that require prolonged continuous operation.

Key words： laser induced breakdown spectroscopy； fiber laser； quantitative analysis； self-absorption ef-fect；calibration-free method

1引言

在钛合金中，铝（AI）和钒（V）作为关键合金元素，对合金的性能优化起着至关重要的作用，适量的Al和V元素可以显著提高钛合金的抗拉强度、耐疲劳性、可焊性和热稳定性，因此，准确测定钛合金中的元素浓度具有重要意义。（剩余12638字）