Optimization of Laser-Induced Breakdown Spectroscopy for Be Element Detection with Self-Absorption Effect Correction

Abstract

The laser-induced breakdown spectroscopy detection of Be elements can provide onsite rapid detection technology for the field of geological exploration. The self-absorption effect of Be results in weaker detection accuracy in the medium to high content range. This study calculated the self-absorption parameters for the self-absorption effect of Be element, and optimized the detection delay and laser energy with the goal of reducing the self-absorption effect. The influence of laser energy on self-absorption effect under two different light receiving angles was discussed through plasma imaging and spatially resolved spectroscopy. A plausible explanation for the opposing trends in axial and radial spectra arises from the competing effects of evolving plasma temperature and optical thickness. Under optimized parameters, the calibration model was corrected for self-absorption effects, resulting in a linear detection model that can range from 6 to 10000 ppm, which broadens the range of on-site detection of Be containing mineral LIBS.