چكيده به لاتين
Nowadays material identification and elements detection is an important equipment in research and industry. Improving methods of element detection and material analyzing, has led to considerable progress in research an industry.
Laser Induced Breakdown Spectroscopy (LIBS) method, because of the benefits of early detection, high precision, no need to sample preparation, capability for all three states of matter, has always been researchers interest. Totally LIBS technique has been widely used for studying in fields of industry, geology, aerospace, military, medical, art, archeology and science.
In LIBS method, focusing a laser pulse would ablate a very small volume of sample material, in the following, laser energy absorbing change the ablated material in to the plasma. Over time, the plasma cools and radiate. Because the radiated spectrum is the result of the sample material ablation, the location of spectral lines represents the elements of sample material and the spectral lines intensity is an estimation of the sample quantitative analysis.
In this thesis, the element of Portland cement samples is detected by LIBS methods and the amounts of elements is compared in number of samples. Then, using the results of radiative spectrum, the validity of Local Thermodynamic equilibrium (LTE) was investigated and the Thermodynamic parameters such as electron temperature and electron density was orderly calculated using Boltzmann and Saha-Boltzman equations.
Keywords: Laser Induced Breakdown Spectroscopy, Local Thermodynamic equilibrium, electron temperature, Electron density, Saha-Boltzman equation
