Detection of Marine Metal Elements by LIBS Based on Passive Q-switched Laser

Laser induced breakdown spectroscopy (LIBS) is a kind of laser ablation spectrum analysis technology, which has the advantages of small sample damage, fast detection speed and simultaneous detection of multiple elements. In this paper, a LIBS system based on passive Q-switched laser is designed, which is used to carry out marine heavy metal detection research Aiming at the two or more laser pulses that the laser may generate in a single pumping cycle, a laser pulse control module is designed in this paper to analyze and judge the number of laser pulses, and obtain good experimental results. Using this LIBS system to output single-pulse and double-pulse lasers to detect samples of seawater and shells in different regions, we can detect the presence of characteristic spectral lines of elements such as Na, Mg, Ga and other elements in seawater. At the same time, the characteristic spectra of Cu, Al and some other elements are found in the shell samples, which suggest that there are heavy metal pollution components in the shells.