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Characterization of a Focused Laser Differential Interferometer

Lawson, Joel M. and Neet, Mallory C. and Grossman, Ilan J. and Austin, Joanna M. (2019) Characterization of a Focused Laser Differential Interferometer. In: AIAA Scitech 2019 Forum. American Institute of Aeronautics and Astronautics , Reston, VA, Art. No. 2019-2296. ISBN 978-1-62410-578-4.

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A focused laser differential interferometer (FLDI) has been experimentally characterized. The static response was probed using a steady, laminar helium jet, and the dynamic response was investigated using a free ultrasonic acoustic beam. In the case of the jet, the refractive index field was independently measured using a Mach-Zehnder interferometer operating simultaneously alongside FLDI. The experimental data were compared with numerical simulations of the FLDI response based on geometric optics and a ray-tracing algorithm. Close quantitative agreement was found between data and simulation results, validating this approach to modeling FLDI performance. Emphasis was given to quantification of the spatial sensitivity of the system, a key characteristic of FLDI, especially when applied to hypersonic ground testing facilities where strong turbulent flow exists outside the core flow.

Item Type:Book Section
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Additional Information:© 2019 American Institute of Aeronautics and Astronautics. Published Online: 6 Jan 2019.
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Other Numbering System NameOther Numbering System ID
AIAA Paper2019-2296
Record Number:CaltechAUTHORS:20200806-124527212
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Official Citation:Characterization of a Focused Laser Differential Interferometer. Joel M. Lawson, Mallory C. Neet, Ilan J. Grossman, and Joanna M. Austin. AIAA Scitech 2019 Forum. January 2019; doi: 10.2514/6.2019-2296
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104777
Deposited By: Tony Diaz
Deposited On:06 Aug 2020 20:41
Last Modified:06 Aug 2020 20:41

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