Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Reexamination Certificate
2005-06-07
2005-06-07
Evans, F. L. (Department: 2877)
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
C250S458100
Reexamination Certificate
active
06903817
ABSTRACT:
A method for detecting chemical species present in a condensed medium including determining characteristic wavelengths and intensity values of back-scattered electromagnetic emission signals due to fluorescence of chemical species excited in response to a multiplicity of electromagnetic excitations of distinct wavelengths of at least one chemical species that could be contained in the condensed medium; successively exciting a multiplicity of surface elements of a surface portion of the condensed medium with a laser beam having tunable wavelength capable of taking on at least one of value of the distinct wavelengths of the multiplicity of electromagnetic excitations; successively recording wavelengths and intensity values of the electromagnetic emission signals back-scattered by each of the surface elements in response to the electromagnetic excitations produced by the beam; comparing at least one excitation wavelength and at least one corresponding emission wavelength of the recorded intensity value of the electromagnetic signal back-scattered by each of the surface elements with the determined characteristic intensity value of the back-scattered electromagnetic signal of the chemical species that could be contained in the surface portion; and determining the presence of the chemical species in each of the surface elements when the recorded intensity value of the electromagnetic signal back-scattered by the surface element is greater than a threshold defined at least by the determined characteristic intensity value of the back-scattered electromagnetic signal of the chemical species.
REFERENCES:
patent: 0 324 583 (1989-07-01), None
patent: 0 474 264 (1992-03-01), None
patent: 97/11355 (1997-03-01), None
Fichot Philippe
Nau Edouard
Sarger Laurent
Centre National de la Recherche Scientifique "CNRS"
DLA Piper Rudnick Gray Cary US LLP
Evans F. L.
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