Photothermal gas sensing with a custom-made, fiber-coupled Fabry-Pérot etalon

M. Tanzer; B. Lang; A. Bergmann

doi:10.1117/12.2676337

4 October 2023 Photothermal gas sensing with a custom-made, fiber-coupled Fabry-Pérot etalon

M. Tanzer, B. Lang, A. Bergmann

Proceedings Volume 12672, Applied Optical Metrology V; 126720D (2023) https://doi.org/10.1117/12.2676337
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

Growing awareness of the adverse health effects of nitrogen oxides has increased the demand for reliable, sensitive and mass-producible sensor systems. Photothermal interferometry has shown great promise towards sensitive, selective and miniaturized sensor solutions. This work describes the development of a macroscopic photothermal sensor system with a sensor head consisting of a low-cost, custom-made and fiber-coupled Fabry-P´erot etalon. The sensor was tested with NO₂, achieving a 3σ limit of detection of 2.5 ppmv (1 s). Exhibiting little drift, a limit of detection of 100 ppbv is achievable for 200 s integration time. Compensating for the low excitation power, the normalized noise equivalent absorption was calculated to be 2.2 × 10⁻⁸ cm⁻¹W/ √ Hz. The sensor system is not limited to NO₂, but can be used for any gas or aerosol species, by exchanging the excitation laser source.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

M. Tanzer, B. Lang, and A. Bergmann "Photothermal gas sensing with a custom-made, fiber-coupled Fabry-Pérot etalon", Proc. SPIE 12672, Applied Optical Metrology V, 126720D (4 October 2023); https://doi.org/10.1117/12.2676337

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