Work

Research on Enhancement of LIBS Signal Stability Through the Selection of Spectral Lines Based on Plasma Characteristic Parameters

Year: 2025

Type: article

Abstract: Laser-induced breakdown spectroscopy (LIBS) is widely used for online quantitative analysis in industries due to its rapid analysis and minimal damage. However, challenges like signal instability, matrix effects, and self-absorption hinder the measurement accuracy. Recent approaches, including the internal standard method and crater limitation method, aim to improve the stability but suffer from high computational demands or complexity. This study proposes a method to enhance LIBS stability by utilizing craters formed from laser ablation without external cavity assistance. It first improves the plasma temperature calculation reliability using multiple elemental spectral lines, after which electron density calculations are performed. By fitting plasma parameter curves based on laser pulse counts and using a laser confocal microscope for crater analysis, stable plasma conditions were found within crater areas of 0.400 mm2 to 0.443 mm2 and depths of 0.357 mm to 0.412 mm. Testing with elemental spectral lines of Ti II, K II, Ca I, and Fe I showed a significant reduction in the relative standard deviation (RSD) of the LIBS spectral line intensity, demonstrating an improved signal stability within specified crater dimensions.

Source: Chemosensors

DOI: 10.3390/chemosensors13020042

Authors: Yunfeng Xia, Honglin Jian, Qishuai Liang, Xilin Wang

Institutions: China Southern Power Grid (China), Tsinghua Shenzhen International Graduate School, Tsinghua University

Language: English

Topic: Laser-induced spectroscopy and plasma

Subfield: Mechanics of Materials

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,413

Funder: China Southern Power Grid