AIAA Scitech 2019 Forum 2019
DOI: 10.2514/6.2019-2296
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Characterization of a Focused Laser Differential Interferometer

Abstract: 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-tr… Show more

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Cited by 35 publications
(2 citation statements)
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“…The resulting signals are recorded on an AMOtronics transient recorder with DC coupling and a 100 MHz sampling rate. Conversion of the recorded voltage into the FLDI phase difference is performed following [60]. Prior to each shock tunnel run, the FLDI is adjusted to half the maximum output value, for optimal sensitivity.…”
Section: Methodsmentioning
confidence: 99%
“…The resulting signals are recorded on an AMOtronics transient recorder with DC coupling and a 100 MHz sampling rate. Conversion of the recorded voltage into the FLDI phase difference is performed following [60]. Prior to each shock tunnel run, the FLDI is adjusted to half the maximum output value, for optimal sensitivity.…”
Section: Methodsmentioning
confidence: 99%
“…Since the interferometer is adjusted to an infinite fringe configuration, this results in an uniform intensity change after the beams are made to interfere with the polarizer before the photodiode. This approach is present in Lawson et al (2019), only using Wollaston prisms instead of Sanderson. Conversion of voltage produced by the photodetectors into phase difference was also performed following that work.…”
Section: Double-foci Fldimentioning
confidence: 99%