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One-dimensional interferometric Rayleigh scattering velocimetry using a virtually imaged phased array
Optics Letters
|October 15, 2021
Summary
This study demonstrates one-dimensional interferometric Rayleigh scattering velocimetry using a virtually imaged phased array (VIPA) for accurate flow velocity measurements. The technique achieved 10 m/s accuracy in high-speed air jet experiments.
Area of Science:
- Fluid dynamics
- Optical measurement techniques
- Laser velocimetry
Background:
- Traditional velocimetry methods can face limitations in accuracy and speed.
- Interferometric techniques offer high sensitivity for measuring subtle changes.
Purpose of the Study:
- To demonstrate a novel one-dimensional interferometric Rayleigh scattering velocimetry system.
- To evaluate the system's accuracy and performance in high-speed flow conditions.
Main Methods:
- Utilized a virtually imaged phased array (VIPA) as a key optical component.
- Employed a continuous-wave 532 nm laser source and a low-noise CCD camera detector.
- Configured the VIPA with a 15 GHz free spectral range for the 500-600 nm wavelength range.
Main Results:
- Achieved velocity measurements with an accuracy of 10 m/s.
- Successfully demonstrated high-speed flow velocity measurement in an air jet.
- Investigated system optimization factors and potential extensions.
Conclusions:
- The developed VIPA-based interferometric Rayleigh scattering velocimetry is a viable technique for accurate flow measurement.
- The system shows promise for applications requiring high-speed fluid velocity characterization.
- Further research can explore adapting this strategy for other optical measurement techniques.
