Patent ID: 8054470

Claim:
A method of material analysis of a target object comprising: (a) creating ultrasonic displacements on a surface of a part of the target object by directing a generation laser beam at the part of the target; (b) varying the wavelength of the generation laser beam and creating ultrasonic displacements on the surface of the part of the target by directing the generation laser beam having the varied wavelength at the part of the target; (c) measuring the amplitude of the ultrasonic displacements of step (a) and step (b); (d) forming a plot of the wavelengths of the generation beams with the measured ultrasonic displacements; (e) providing a plot of wavelengths of generation laser beams versus ultrasonic displacements created by generation laser beams directed to a target of known composition; and (f) determining the target composition by comparing the plot of step (d) with the plot of step (e).