Optogalvanic spectroscopy with phase independent detection

Details Optogalvanic spectroscopy with phase independent detection Optogalvanic spectroscopy with phase independent detection

G - Physics

01

N

G01N 21/17 (2006.01) G01N 27/62 (2006.01)

Patent

CA 2201241

In an optogalvanic spectroscopy system a plasma is exposed to light at a wavelength associated with a particular species in the analyte. The light is amplitude modulated. The amplitude of a modulated component in the signal representing electrical impedance of the plasma is detected in a phase independent manner so that the detected amplitude is substantially independent of the phase of the modulated component in the impedance signal relative to the amplitude modulation of the light. The system has reduced sensitivity to changes in the spectrum of the applied light.

Dans un système de spectroscopie optogalvanique, un plasma est exposé à une lumière dont la longueur d'onde est associée à une espèce particulière dans l'échantillon à analyser. La lumière est modulée en amplitude. L'amplitude d'un composant modulé dans le signal, représentant l'impédance électrique du plasma, est détectée d'une manière qui est indépendante de la phase, de sorte que l'amplitude détectée est considérablement indépendante de la phase du composant modulé dans le signal d'impédance par rapport à la modulation d'amplitude de la lumière. Le système est peu sensible aux changements du spectre de la lumière.

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