Signal Enhancement in Collinear Double-pulse Laser-induced Breakdown Spectroscopy Applied to the Soils of MagnesiumElement

摘要

As one of the most important natural resources for human survival, soil is the basis and fundamental of agricultural production Soil nutrients are divided into a large number of elements, middle elements and trace elements, which play a vital role inthe growth of plants, no matter more or less.In this study, magnesium elements were used as the object of study, and the wavelengths of the three elements (516.73nm, 517.27nm and 518.36nm) were compared and analyzed from the two angles of single pulse and collinear double pulse. Firstly, the parameters of single and double pulse are optimized according to the signal intensity, signal-to-noise ratio (SNR) and the relative standard deviation (RSD). The optimal delay time of single pulse is 6us, the pulse energy is lOOmJ, and the optimal delay time is 2us, the first pulse energy is 20mJ, the second pulse energy is 80m J, the two pulse interval is 1200ns.Using the optimal parameters analyzed before, the results show that the signal intensity and signal-to-noise ratio of the three wavelengths of the magnesium element are about twice as high as the single pulse, and the relative standard deviation is reduced to the original 0.6-0.7 times. The effect of collinear double pulse on the optimization of magnesium elements in soil was obvious, which laid a good foundation for the subsequent analysis and qualitative and quantitative analysis of other elements insoil.