Hari Prasath M, Amar GHAR, Honhar GUPTA, Priyanka CHAVAN, Mohammed Ibrahim SUGARNO
DOI Number: XXX-YYY-ZZZ
Conference number: HiSST2024-00210
Understanding plasma behaviour is crucial for designing effective thermal protection systems that withstand extreme heat generated during hypersonic flight. This work revolves around various techniques to quantify the temperature of air plasma using Atomic Emission Spectroscopy (AES) and discusses some interesting observations. Laser Induced Breakdown Spectroscopy (LIBS) is a technique to produce plasma by focusing a laser pulse to high irradiance. A 532 nm Q-switched Nd: YAG laser with a pulse duration of 10 ns and frequency of 10Hz is focused on atmospheric air to induce plasma at various laser powers of 250-500 mW. The plasma emission was captured by an optical spectrometer. The species present in the spectrum are identified using the NIST Atomic Spectra Database and the temperature of the air plasma at the range of different exposure times varying from 2-14 s are estimated. The results are discussed. The electronic temperature estimated using N II lines in the Boltzmann plot method under the assumption of local thermodynamic equilibrium (LTE) are in the order of approximately 37,000-38,000 K. This is a work in progress and further work will be presented at the conference.