Miniaturized resonant photoacoustic cell of inclined geometry for trace-gas detection

Gorelik, A. V.; Ulasevich, A. L.; Nikonovich, F. N.; Zakharich, M. P.; Firago, V. A.; Kazak, N. S.; Starovoitov, V. S.

doi:10.1007/978-3-642-02292-0_8

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the same vein, Pellegrino and Holthoff [4], addressing the detection of chemical agents, designed and characterized a differential cell of ∼15 mm 3 internal volume, reaching a detection limit of ∼20 ppb for dimethyl methylphosphonate. Other notable progress in the size reduction direction has also been performed by Gorelik et al [5], with inclined geometry cells (∼500 mm 3 internal volume), who reached, for instance, a detection limit of ∼10 ppm for ammonia. On their side, Karioja et al [6] implemented a low-temperature co-fired ceramics technology to build a ∼8 mm 3 differential PA cell.…”

Section: Introductionmentioning

confidence: 98%

Challenges in the Design and Fabrication of a Lab-on-a-Chip Photoacoustic Gas Sensor

Glière

Rouxel

Brun

et al. 2014

Sensors

View full text Add to dashboard Cite

The favorable downscaling behavior of photoacoustic spectroscopy has provoked in recent years a growing interest in the miniaturization of photoacoustic sensors. The individual components of the sensor, namely widely tunable quantum cascade lasers, low loss mid infrared (mid-IR) waveguides, and efficient microelectromechanical systems (MEMS) microphones are becoming available in complementary metal–oxide–semiconductor (CMOS) compatible technologies. This paves the way for the joint processes of miniaturization and full integration. Recently, a prototype microsensor has been designed by the means of a specifically designed coupled optical-acoustic model. This paper discusses the new, or more intense, challenges faced if downscaling is continued. The first limitation in miniaturization is physical: the light source modulation, which matches the increasing cell acoustic resonance frequency, must be kept much slower than the collisional relaxation process. Secondly, from the acoustic modeling point of view, one faces the limit of validity of the continuum hypothesis. Namely, at some point, velocity slip and temperature jump boundary conditions must be used, instead of the continuous boundary conditions, which are valid at the macro-scale. Finally, on the technological side, solutions exist to realize a complete lab-on-a-chip, even if it remains a demanding integration problem.

show abstract

Section: Introductionmentioning

confidence: 98%