Affiliation:
1. PolySense Lab-Dipartimento Interateneo di Fisica, Politecnico and University of Bari, Via Amendola 173, I-70100 Bari, Italy
2. Polysense Innovations Srl 2, Via Amendola 173, I-70100 Bari, Italy
3. Walter Schottky Institute, Technical University of Munich, Am Coulombwall 4, D-85748 Garching, Germany
Abstract
In this work, we report on the implementation of a multi-quantum cascade laser (QCL) module as an innovative light source for quartz-enhanced photoacoustic spectroscopy (QEPAS) sensing. The source is composed of three different QCLs coupled with a dichroitic beam combiner module that provides an overlapping collimated beam output for all three QCLs. The 3λ-QCL QEPAS sensor was tested for detection of NO2, SO2, and NH3 in sequence in a laboratory environment. Sensitivities of 19.99 mV/ppm, 19.39 mV/ppm, and 73.99 mV/ppm were reached for NO2, SO2, and NH3 gas detection, respectively, with ultimate detection limits of 9 ppb, 9.3 ppb, and 2.4 ppb for these three gases, respectively, at an integration time of 100 ms. The detection limits were well below the values of typical natural abundance of NO2, SO2, and NH3 in air.
Funder
European Union’s Horizon 2020 research and innovation program
PolySenSe joint research laboratory
Subject
Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry
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