Recent progress in high-speed laser diagnostics for hypersonic flows [Invited]

The recent progress in high-speed (≥100 ) laser diagnostics for hypersonic flows is reviewed. Owing to the ultrahigh flow speed, a laser frequency of 100 kHz or higher is required for hypersonic diagnostics. Here, two main laser diagnostic techniques are discussed: focused laser differential interfe...

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Bibliographic Details
Published inApplied optics. Optical technology and biomedical optics Vol. 62; no. 6; p. A59
Main Authors Jiang, Naibo, Hsu, Paul S, Gragston, Mark, Roy, Sukesh
Format Journal Article
LanguageEnglish
Published United States 20.02.2023
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Summary:The recent progress in high-speed (≥100 ) laser diagnostics for hypersonic flows is reviewed. Owing to the ultrahigh flow speed, a laser frequency of 100 kHz or higher is required for hypersonic diagnostics. Here, two main laser diagnostic techniques are discussed: focused laser differential interferometry (FLDI) and pulse-burst laser-based diagnostics. Single- and multiple-point FLDI measurements have been widely applied to hypersonic flows for flow velocity and density fluctuation measurements. The progress of pulse-burst laser-based hypersonic diagnostics, including flow velocity measurements and 2D flow visualization, is also discussed.
ISSN:2155-3165
DOI:10.1364/AO.480298