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Modulation based ranging for direct displacement measurements of a dynamic surface
Optics Express
|July 16, 2021
Summary
We developed Modulation Based Ranging (MBR) to directly measure surface displacement in dynamic experiments. This new method accurately tracks movement, even with complex non-radial flow, achieving sub-100 µm resolution.
Area of Science:
- Experimental Mechanics
- High-Speed Diagnostics
- Shock Physics
Background:
- Accurate displacement measurement is crucial for understanding dynamic events.
- Traditional methods like integrating velocity can introduce errors, especially with non-radial flow.
- Existing techniques struggle with precise displacement tracking in complex experimental conditions.
Purpose of the Study:
- To introduce a novel method for direct displacement measurement.
- To overcome limitations of velocity integration in dynamic experiments.
- To achieve high-resolution displacement data with sub-100 µm accuracy.
Main Methods:
- Development of the Modulation Based Ranging (MBR) technique.
- Analysis and correction of phase-sensitive errors.
- Comparison with Photonic Doppler Velocimetry (PDV) under varying flow conditions.
Main Results:
- MBR provides direct, high-resolution displacement measurements.
- The technique accurately measures displacement even with significant non-radial flow.
- Excellent agreement with integrated PDV velocity was observed in the absence of non-radial flow.
Conclusions:
- Modulation Based Ranging (MBR) is a robust method for direct displacement measurement.
- MBR offers superior accuracy over velocity integration for dynamic experiments with non-radial flow.
- This technique enhances diagnostic capabilities for high explosive and dynamic testing.
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