Ultra high-speed differential interferometry uses a polarized white light source and a Wollaston prism. It is used for ultra high-speed visualizations of unsteady aerodynamic phenomena, to generate quantitative mass density data for a two-dimensional or axisymmetrical flow. The time variation of the mass density field can be reconstructed by taking several instantaneous interferograms in succession.
Optical Setup
Direct differential interferometry using wide-field (up to 400 mm) bi-prism in wollastonite
Two systems:
Single passage through the test section in parallel beams, with compensator and self-compensation (optical setup, beam path)
Dual passage through the test section in slightly divergent beams, with compensator and self-compensation (optical setup, beam path
Interval t between two frames: t=28µs, exposure time for each interferogram: 0.75 µs
Automated wollastonite biprism control and analysis
t=28µs, exposure time for each interferogram: 0.75 µs
Light beam path
(dual path setup)
