Temperature effects in tuning fork enhanced interferometric photoacoustic spectroscopy

Temperature dependent measurements with a compact fiber coupled sensor for trace gas detection in the near-infrared based on tuning fork enhanced interferometric photoacoustic spectroscopy are presented. The temperature effects on the sensor have been investigated in a range from T = -41 °C to T = 1...

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Bibliographic Details
Published in:Optics express 2013-09, Vol.21 (18), p.20911-20922
Main Authors: Köhring, M, Böttger, S, Willer, U, Schade, W
Format: Article
Language:English
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Summary:Temperature dependent measurements with a compact fiber coupled sensor for trace gas detection in the near-infrared based on tuning fork enhanced interferometric photoacoustic spectroscopy are presented. The temperature effects on the sensor have been investigated in a range from T = -41 °C to T = 107 °C, in particular the influence on the resonance frequency and the Q-factor of the micro tuning fork. The refined sensor head contains a combination of a silicon tuning fork and an acoustic off-beam resonator and permits methane detection with a detection limit of S = (3.85 ± 0.01) ppm. The functional capability of a numerical model for the optimization of acoustic off-beam resonators in COMSOL Multiphysics® is presented.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.21.020911