Modulation cancellation method for measurements of small temperature differences in a gas
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Updated: Jun 4, 2026

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
Published on: April 30, 2018
Vincenzo Spagnolo1, Lei Dong, Anatoliy A Kosterev
1Department of Electrical and Computer Engineering, Rice University, Houston, Texas, USA. spagnolo@fisica.uniba.it
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.
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