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Colinear focused laser differential interferometry and self-aligned focusing schlieren.
Applied Optics
|September 14, 2023
Summary
A new combined laser interferometer and schlieren system was developed for fluid dynamics research. This integrated system accurately measures turbulent flow properties without interfering with individual instrument performance.
Area of Science:
- Fluid dynamics
- Optical diagnostics
- Acoustics
Background:
- Turbulent jets are complex phenomena requiring advanced diagnostic tools.
- Simultaneous optical measurements can provide richer datasets for fluid flow analysis.
Purpose of the Study:
- To integrate a focused laser differential interferometer (FLDI) and a self-aligned focusing schlieren (SAFS) system.
- To evaluate the performance and compatibility of the colinear FLDI/SAFS system for turbulent flow diagnostics.
Main Methods:
- Assembled a colinear FLDI and SAFS system.
- Used a turbulent air jet as a high-frequency density object.
- Performed quantitative comparisons using power spectral density and proper orthogonal decomposition.
Main Results:
- The integrated SAFS system had negligible impact on FLDI data quality.
- Both systems accurately captured the acoustic frequency of the turbulent jet.
- Demonstrated good agreement between FLDI and SAFS measurements.
Conclusions:
- The colinear FLDI/SAFS system is a viable tool for simultaneous, non-intrusive flow measurement.
- This integrated approach enhances the study of high-frequency density fluctuations in turbulent flows.
