Patent ID: 6526372
Filing Date: 2003-02-25
Classification: G01R

Abstract:
A method of determining the dependence of a light-induced material characteristic, occurring at a location of a surface of a material when excited by excitation light having a wavelength and directed on said location, on said wavelength of said excitation light, comprising the steps of:cyclically varying said excitation light wavelength in a wavelength range at a wavelength variation frequency, measuring said light-induced material characteristic at said location as a function of said excitation light wavelength to obtain a signal waveform, as a function of time, cyclic at said variation frequency, providing harmonic components of said signal waveform of measured light-induced material characteristic v. time at, at least, a plurality of frequencies, and constructing, by signal processing from said components, a function representing the dependence of said light-induced material characteristic on said excitation light wavelength.