Method for optically detecting chemical species contained in condensed media
US6903817B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 2003 |
| Grant date | Jun 7, 2005 |
| Priority date | — |
| Expiry date | Dec 1, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/6456
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 chemi…
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