An innovative spectroscopic technique based on balancing and cancellation of modulated signals induced by two excitation sources is reported. For its practical implementation, we used quartz-enhanced photoacoustic spectroscopy as an absorption-sensing technique and applied the new approach to measure small temperature differences between two gas samples. The achieved sensitivity was 30 mK in 17 s. A theoretical sensitivity analysis is presented, and the applicability of this method to isotopic measurements is discussed.
Modulation cancellation method for measurements of small temperature differences in a gas / Spagnolo, V.; Dong, L.; Kosterev, A. A.; Thomazy, D.; Doty III, J. H.; Tittel, F. K.. - In: OPTICS LETTERS. - ISSN 0146-9592. - STAMPA. - 36:4(2011), pp. 460-462. [10.1364/OL.36.000460]
Modulation cancellation method for measurements of small temperature differences in a gas
Spagnolo, V.;
2011-01-01
Abstract
An innovative spectroscopic technique based on balancing and cancellation of modulated signals induced by two excitation sources is reported. For its practical implementation, we used quartz-enhanced photoacoustic spectroscopy as an absorption-sensing technique and applied the new approach to measure small temperature differences between two gas samples. The achieved sensitivity was 30 mK in 17 s. A theoretical sensitivity analysis is presented, and the applicability of this method to isotopic measurements is discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
