Femtosecond Two-Photon Absorption Laser Induced Fluorescence (fs-TALIF) Imaging of Atomic Nitrogen in Nanosecond Repetitive Discharges - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2019

Femtosecond Two-Photon Absorption Laser Induced Fluorescence (fs-TALIF) Imaging of Atomic Nitrogen in Nanosecond Repetitive Discharges

Résumé

Presented herein is a feasibility study for absolute measurements of ground state atomic nitrogen inside of a nanosecond repetitive pulse (NRP) discharge using a femtosecond two-photon absorption laser induced fluorescence (TALIF) technique. A two-photon absorption scheme (λ = ×206.6 nm) is used to probe the ground state population of atomic nitrogen (2p 3 4 S) inside the discharge. The scheme involves the excitation of the 3p 4 S3/2 level with the subsequent fluorescence collection taking place from the radiative decay to the 3s 4 P triplet state around 745 nm. The main challenge is to demonstrate the ability to perform the measurements at above atmospheric conditions where the typical ns-TALIF diagnostics is unable to provide information due to the high rate of collisional quenching. As such, the current investigation focuses on high-pressure discharges in pure nitrogen. We demonstrate here the ability to measure fs-TALIF signals from atomic nitrogen in NRP discharges operated at pressures between 0.1-5 bar. Additionally, we perform fs-TALIF measurements in Krypton and we identify the main fluorescence channels using the λ = ×204.13 nm excitation scheme. We report that significant saturation effects was observed in both mixtures due to the presence of photoionization which resulted in a departure from the I 2 dependency of the TALIF intensity.
Fichier principal
Vignette du fichier
dumitrache2019.pdf (1.19 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02494206 , version 1 (28-02-2020)

Identifiants

Citer

Ciprian Dumitrache, Arnaud Gallant, Gabi Daniel Stancu, Christophe O. Laux. Femtosecond Two-Photon Absorption Laser Induced Fluorescence (fs-TALIF) Imaging of Atomic Nitrogen in Nanosecond Repetitive Discharges. AIAA Scitech 2019 Forum, Jan 2019, San Diego, France. ⟨10.2514/6.2019-1507⟩. ⟨hal-02494206⟩
443 Consultations
153 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More