High rate concentration measurement of molecular gas mixtures using a spatial detection technique

Vincent Loriot (1) , Edouard Hertz (1) , Bruno Lavorel (1) , Olivier Faucher (1)

1 ICB - Laboratoire Interdisciplinaire Carnot de Bourgogne

Concentration measurement in molecular gas mixtures using a snapshot spatial imaging technique is reported. The approach consists of measuring the birefringence of the molecular sample when field-free alignment takes place, each molecular component producing a signal with an amplitude depending on the molecular density. The concentration measurement is obtained on a single-shot basis by probing the time-varying birefringence through femtosecond time-resolved optical polarigraphy (FTOP). The relevance of the method is assessed in air.

Mots clés: Molecular alignment; Concentration measurement; Femtosecond laser; Optical polarigraphy; Single-shot

Domaines: Physique Atomique [physics.atom-ph]

Vincent Loriot, Edouard Hertz, Bruno Lavorel, Olivier Faucher. High rate concentration measurement of molecular gas mixtures using a spatial detection technique. Journal of Chemical Physics, 2010, 132 (18), pp.184303. ⟨hal-00503040⟩