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Published January 7, 2019 | Published
Book Section - Chapter Open

Characterization of a Focused Laser Differential Interferometer


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.

Additional Information

© 2019 American Institute of Aeronautics and Astronautics. Published by the American Institute of Aeronautics and Astronautics, Inc. Published Online: 6 Jan 2019. The authors would like to gratefully acknowledge Prof. J. E. Shepherd for all his guidance and interest in this project, as well as providing the laboratory space to perform the experimental work. This work was partially supported by the Office of Naval Research award N00014-16-1-2503 with Dr. Eric Marineau and the Air Force Research Laboratory award STTR FA8651-17-C-0071 with Dr. Daniel Reasor.

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