Miniaturizing gas sensors combining mid-infrared interband cascade light emitting diodes with substrate-integrated hollow waveguides

Author:

Hlavatsch Michael1ORCID,Schäfer Nicolas2ORCID,Weih Robert2ORCID,Koeth Johannes2ORCID,Kunsch Johannes3ORCID,Mizaikoff Boris14ORCID

Affiliation:

1. Institute of Analytical and Bioanalytical Chemistry, Ulm University 1 , Albert-Einstein-Allee 11, D-89081 Ulm, Germany

2. Nanoplus Advanced Photonics Gerbrunn GmbH 2 , Oberer Kirschberg 4, 97218 Gerbrunn, Germany

3. Laser Components Germany GmbH 3 , Werner-von-Siemens-Strasse 15, D-82140 Olching, Germany

4. Hahn-Schickard 4 , Sedanstrasse 14, D-89077 Ulm, Germany

Abstract

In this study, we report a compact and versatile gas sensor system combining mid-infrared interband cascade light emitting diodes (MIR-ICLEDs) with substrate-integrated hollow waveguides (iHWGs) toward miniaturized gas sensors. Two readily exchangeable MIR-ICLEDs with center emission wavelengths of 3.4 µm (2941 cm−1) and 5.7 µm (1754 cm−1), respectively, were integrated into a modular sensor system using the iHWG simultaneously as a miniaturized gas cell. The performance of the sensor system for quantitative analysis was evaluated based on calibration functions established for four analytes (i.e., methane, isobutane, acetone, and acetaldehyde) within the respective spectral regions. The utility of such a sensor system as a non-dispersive infrared sensor was tested for various scenarios, including the application of spectral filters, the performance of the individual ICLEDs, and in the analysis of gas mixtures. Furthermore, we demonstrated that the modularity of the sensor design facilitates flexible adaptation to target gas species and available sample volumes, differentiating individual components within gas mixtures.

Funder

Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg

Horizon 2020 Framework Program

SFI Digital Food Quality

Publisher

AIP Publishing

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