Fotoacústica inducida por pulsos láser para la identificación cualitativa de contaminantes depositados sobre acero.

Abstract

The photo-acoustic technique induced by laser pulses as a qualitative identification method of contaminants deposited over metal surfaces is presented. By another hand, this technique allows to demonstrate the remotion monitoring process of contaminants layer by layer, identifying in each stage of the process the types of contaminants found. A Nd:YAG laser with variable energy pulse emits in passive multipulse Q-switch regimen is used to remove contaminants. Characteristic spectra were obtained for different types of contaminants from the material and the dependence of the acoustic signal intensity for bands associated with the various contaminants on the number of pulses