Modulation cancellation method for measurements of small temperature differences in a gas

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 measur...

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Bibliographic Details
Published in:Optics letters 2011-02, Vol.36 (4), p.460-462
Main Authors: SPAGNOLO, Vincenzo, LEI DONG, KOSTEREV, Anatoliy A, THOMAZY, David, DOTY, James H, TITTEL, Frank K
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Optics
Physics
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Summary: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.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.36.000460