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Multi-wavelength crosstalk-free velocimetry demonstration and uncertainties
Yohan Barbarin1, Gaël Le Blanc1, Marie Roudot1
1CEA, DAM, GRAMAT, BP 80200, F-46500 Gramat, France.
The Review of Scientific Instruments
|September 1, 2022
Summary
This study introduces a 16-wavelength photonic Doppler velocimetry system to accurately measure 2D surface velocities in shock physics experiments, overcoming crosstalk issues for novel materials.
Area of Science:
- Materials Science
- Physics
- Optical Engineering
Background:
- Measuring 2D surface velocities of novel materials in shock physics experiments is crucial.
- Conventional velocimetry systems face crosstalk issues with close-proximity measurements.
- Wavelength multiplexing offers a solution to mitigate crosstalk.
Purpose of the Study:
- To demonstrate the benefits of a 16-wavelength photonic Doppler velocimetry (PDV) system.
- To address and resolve crosstalk issues in high-speed velocity measurements.
- To validate the performance of the multiplexed PDV system in shock physics applications.
Main Methods:
- Implementation of a 16-wavelength PDV system.
- Conducting dedicated crosstalk comparative experiments using a high-pulsed-power generator.
- Performing experiments at approximately 80 m/s and 130 m/s to assess system performance.
- Analyzing velocity uncertainties by measuring the same point with all 16 wavelengths.
Main Results:
- Demonstrated significant reduction in crosstalk compared to conventional systems.
- Successfully measured 2D surface velocities of novel materials with high accuracy.
- Quantified velocity uncertainties under different experimental conditions.
- Validated the effectiveness of wavelength multiplexing in PDV.
Conclusions:
- The 16-wavelength multiplexed PDV system effectively overcomes crosstalk limitations.
- This advanced PDV system enhances the precision of 2D surface velocity measurements in shock physics.
- The developed system provides a robust solution for characterizing novel materials under extreme conditions.
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