Growing awareness of the adverse health effects of air pollution has increased the demand for reliable, sensitive, and mass-producible sensor systems. Photothermal interferometry has shown great promise for sensitive, selective, and miniaturized gas sensing 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–Pérot etalon. The sensor was tested with NO2, achieving a 3σ limit of detection (LOD) of approximately 370 ppbv (1 s). Exhibiting little drift, a LOD of 15 ppbv is achievable for 200 s integration time. Compensating for the excitation power, the normalized noise equivalent absorption was calculated to be 1.4×10−8 cm−1WHz. The sensor system is not limited to NO2 but can be used for any gas or aerosol species by exchanging the excitation laser source.
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.
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