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Resonant photoacoustic CO2 spectroscopy with LED light source

: Pernau, Hans-Fridtjof; Schmitt, Katrin; Huber, Jochen; Rademacher, Sven; Eberhardt, André; Wöllenstein, Jürgen

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Procedia Engineering 168 (2016), S.1325-1328
ISSN: 1877-7058
Eurosensors Conference <30, 2016, Budapest>
European Commission EC
H2020-Eurostars; E!9727; MASUM
Marine Sulfur Monitor
Zeitschriftenaufsatz, Konferenzbeitrag, Elektronische Publikation
Fraunhofer IPM ()
CO2 sensing; LED; photoacoustic spectroscopy; Resonant Detection

We have applied resonant photoacoustic sensing for carbon dioxide (CO2) detection using a mid-infrared LED light source at 4.3μm. The pressure signals are detected using a MEMS microphone. A simple cell design has been adapted to achieve an optimal enhancement of the acoustic signal. The cell can be operated both in closed and open configuration, allowing a permanent gas flow. With the components we used a compact and low-cost CO2 sensor can be realized. We present first results of our photoacoustic sensor using the binary gas mixture CO2 / nitrogen. The signals were evaluated measuring the shift in the resonance frequency of the system. The sensor shows sensitivities down to a few percent CO2. Ideas to further enhance the sensitivity of the sensor are discussed.