Comparison of existing laser-induced breakdown thermometry techniques along with a time-resolved breakdown approach
Williamson AP, Thiele U, Kiefer J (2019)
Publication Type: Journal article
Publication year: 2019
Journal
Book Volume: 58
Pages Range: 3950-3956
Journal Issue: 14
DOI: 10.1364/AO.58.003950
Abstract
Temperature is an important parameter for characterizing chemical, physical, and flow processes occurring in combustion environments. Laser-induced breakdown is a process widely used to determine a material's elemental components and its composition, known as laser-induced breakdown spectroscopy (LIBS). The breakdown event, or more specifically the breakdown threshold, for a low-pressure gas strongly depends on density effects emanating in the likelihood for multiphoton and avalanche ionization. In this work, a comparison of thermometry techniques using laser-induced breakdown is made and an approach to perform simultaneous gas-phase thermometry on a shot-to-shot basis and spectroscopy is demonstrated by monitoring the moment in time the thermal plasma develops along the intensity gradient of a laser pulse. Breakdown thresholds are profiled along the height of a lean methane-air and partially combusting rich propane-air McKenna flame, and correlated to radiation and convection-corrected thermocouple readings.
Involved external institutions
Germany (DE)How to cite
APA:
Williamson, A.P., Thiele, U., & Kiefer, J. (2019). Comparison of existing laser-induced breakdown thermometry techniques along with a time-resolved breakdown approach. Applied Optics, 58(14), 3950-3956. https://dx.doi.org/10.1364/AO.58.003950
MLA:
Williamson, Andrew P., Ulrich Thiele, and Johannes Kiefer. "Comparison of existing laser-induced breakdown thermometry techniques along with a time-resolved breakdown approach." Applied Optics 58.14 (2019): 3950-3956.
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