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A selective, miniaturized, low-cost detection element for a photoacoustic CO2 sensor for room climate monitoring

: Huber, J.; Ambs, A.; Rademacher, S.; Wöllenstein, J.

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Procedia Engineering 87 (2014), pp.1168-1171
ISSN: 1877-7058
European Conference on Solid-State Transducers (Eurosensors) <28, 2014, Brescia>
Journal Article, Conference Paper, Electronic Publication
Fraunhofer IPM ()

We present a miniaturized, low-cost detection element for a photoacoustic spectroscopic gas sensor system. The sensing element consists of a commercial mobile phone microphone and a standard TO socket. The elements are mounted under gas atmosphere and serve as gas selective reference cell. The system is able to detect CO2 selectively with a resolution better than 100 ppm. Further characterization included different environmental conditions and gas cross-sensitivities. The potential for further miniaturization and the realization as a low-cost mass market sensor is shown.