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Article Dans Une Revue Measurement Science and Technology Année : 2023

Peculiarities of measuring fluorescence decay times by a streak camera for ps-TALIF experiments in reactive plasmas

Résumé

In this work, the capacity of a streak camera for capturing picosecond two-photon absorption laser induced fluorescence (ps-TALIF) signals is demonstrated on decay times of H-atoms measured in low-and atmosphericpressure plasmas. The goal is the accurate determination of the decay time of the recorded ps-TALIF signals. A ps-laser is used to excite atomic hydrogen produced in both plasmas and the fluorescence signals are detected by the streak camera using different time windows. It is shown that the choice of the time window of the streak camera affects the shapes and the decay times of the recorded raw TALIF signals. This is defined as the instrumental function of the streak camera and has a Gaussian profile as determined by recording the ultrafast laser pulse at different time windows. To remove this instrumental distortion and extract the actual TALIF signal, a dedicated mathematical procedure involving an exponentially modified Gaussian function has been developed. The application of this method leads to reliable measurements of hydrogen atoms decay times after respecting the following acquisition conditions: (i) the time window of the streak camera should be sufficiently large to capture the complete (raw) TALIF signal, and (ii) the temporal profile of the instrumental function of the streak camera should be as small as possible compared to the actual decay time of the fluorescence, while ensuring an optimal signal-to-noise ratio. This work demonstrates the remarkable potential of the combination of ps-TALIF and streak cameras in state-of-the-art optical plasma diagnostics.
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Dates et versions

hal-03886543 , version 1 (06-12-2022)
hal-03886543 , version 2 (23-05-2023)

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Paternité - Pas de modifications

Identifiants

Citer

Laurent Invernizzi, C.Y. Duluard, Hans Höft, Khaled Hassouni, Guillaume Lombardi, et al.. Peculiarities of measuring fluorescence decay times by a streak camera for ps-TALIF experiments in reactive plasmas. Measurement Science and Technology, 2023, 34 (9), pp.095203. ⟨10.1088/1361-6501/acd8db⟩. ⟨hal-03886543v2⟩
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