A novel spectroscopic technique based on modulation spectroscopy with two excitation sources and quartz enhanced photoacoustic spectroscopy is described. We demonstrated two potential applications of this detection technique. First, we investigated the measurement of small temperature differences in a gas mixture. In this case, a sensitivity of 30 mK in 17 sec was achieved for a C(2)H(2)/N(2) gas mixture with a 0.5% C(2)H(2) concentration. Second, we demonstrated the detection of broadband absorbing chemical species, for which we selected hydrazine as the target molecule and achieved a detection limit of similar to 1 part per million in 1 sec. In both cases, the measurements were performed with near-IR laser diodes and overtone transitions.
Modulation cancellation method in laser spectroscopy / Spagnolo, Vincenzo Luigi; Dong, L.; Kosterev, A. A.; Thomazy, D.; Doty III, J. H.; Tittel, F. K.. - In: APPLIED PHYSICS. B, LASERS AND OPTICS. - ISSN 0946-2171. - 103:3(2011), pp. 735-742. [10.1007/s00340-011-4494-3]
Modulation cancellation method in laser spectroscopy
SPAGNOLO, Vincenzo Luigi;
2011-01-01
Abstract
A novel spectroscopic technique based on modulation spectroscopy with two excitation sources and quartz enhanced photoacoustic spectroscopy is described. We demonstrated two potential applications of this detection technique. First, we investigated the measurement of small temperature differences in a gas mixture. In this case, a sensitivity of 30 mK in 17 sec was achieved for a C(2)H(2)/N(2) gas mixture with a 0.5% C(2)H(2) concentration. Second, we demonstrated the detection of broadband absorbing chemical species, for which we selected hydrazine as the target molecule and achieved a detection limit of similar to 1 part per million in 1 sec. In both cases, the measurements were performed with near-IR laser diodes and overtone transitions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
