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Temperature effects in tuning fork enhanced interferometric photoacoustic spectroscopy

: Köhring, M.; Böttger, S.; Willer, U.; Schade, W.

Postprint (PDF; )

Optics Express 21 (2013), Nr.18, S.20911-20922
ISSN: 1094-4087
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer HHI ()

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 offbeam 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.