Towards the highest sensitivity and selectivity of the Earth's and Space’s laser-based methane sensors

Wojtas, Jacek

doi:10.1016/j.measurement.2023.114064

Cited by 3 publications

(2 citation statements)

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“…However, the use of other bands may also have some advantages in gas detection. This paper concerns the study of the methane sensor, based on an 8.014 µm absorption line, due to its high and untapped application potential [ 21 ]. The selected spectral line has a direct impact on the laser operating point, but its width, i.e., full width at half maximum (FWHM), should also be considered as it depends on the pressure, temperature, and methane concentration [ 12 ].…”

Section: Methodsmentioning

confidence: 99%

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Time-Efficient SNR Optimization of WMS-Based Gas Sensor Using a Genetic Algorithm

Musiałek,

Szabra,

Wojtas

2024

Sensors

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This paper presents the description of the wavelength modulation spectroscopy (WMS) experiment, the parameters of which were established by use of the Artificial Intelligence (AI) algorithm. As a result, a significant improvement in the signal power to noise power ratio (SNR) was achieved, ranging from 1.6 to 6.5 times, depending on the harmonic. Typically, optimizing the operation conditions of WMS-based gas sensors is based on long-term simulations, complex mathematical model analysis, and iterative experimental trials. An innovative approach based on a biological-inspired genetic algorithm (GA) and custom-made electronics for laser control is proposed. The experimental setup was equipped with a 31.23 m Heriott multipass cell, software lock-in, and algorithms to control the modulation process of the quantum cascade laser (QCL) operating in the long-wavelength-infrared (LWIR) spectral range. The research results show that the applied evolutionary approach can efficiently and precisely explore a wide range of WMS parameter combinations, enabling researchers to dramatically reduce the time needed to identify optimal settings. It took only 300 s to test approximately 1.39 × 1032 combinations of parameters for key system components. Moreover, because the system is able to check all possible component settings, it is possible to unquestionably determine the operating conditions of WMS-based gas sensors for which the limit of detection (LOD) is the most favorable.

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Section: Methodsmentioning

confidence: 99%

“…It ensures the optimal operating parameters within a defined range and their adaptive adjustment to changing measurement conditions, ensuring the highest sensor performance. The developed solution was demonstrated in the example of a methane sensor using an absorption line located in LWIR [ 21 ].…”

Section: Introductionmentioning

confidence: 99%