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Multimode optical fiber photonic doppler velocimetery
Yossef Horovitz1, Garry Berkovic1, Ehud Shafir1
1Applied Physics Division, Soreq NRC, Yavne 81800, Israel.
The Review of Scientific Instruments
|October 4, 2018
Summary
A novel optical fiber head for Photonic Doppler Velocimetry (PDV) uses multimode and single-mode fibers for efficient high-velocity measurements. This new design achieves accurate results comparable to standard systems in dynamic shock wave experiments.
Area of Science:
- Optics and Photonics
- Experimental Physics
- Materials Science
Background:
- Photonic Doppler Velocimetry (PDV) is a key technique for measuring high velocities.
- Standard PDV systems often rely solely on single-mode (SM) fibers, which can limit collection efficiency.
- Improving the robustness and efficiency of PDV instrumentation is crucial for dynamic measurements.
Purpose of the Study:
- To develop and characterize a new optical fiber head for PDV utilizing a combination of multimode (MM) and single-mode (SM) fibers.
- To enhance collection efficiency and reduce angular dependence in PDV measurements.
- To validate the performance of the new PDV head in dynamic shock wave experiments.
Main Methods:
- Designed a novel PDV optical fiber head integrating MM and SM fibers with specialized lenses.
- Utilized a SM fiber for input laser delivery and a MM fiber for back-reflected light collection.
- Employed Fourier analysis to resolve fringe frequency and calculate velocity from MM fiber transmission data.
Main Results:
- The new PDV head demonstrated a 20 GHz bandwidth.
- Accurate velocity measurements of approximately 3 km/s (3.9 GHz) were achieved in dynamic shock wave experiments.
- Results from the MM/SM fiber PDV head showed excellent agreement with a standard SM PDV system.
Conclusions:
- The combined MM and SM fiber optical head is a viable and effective design for Photonic Doppler Velocimetry.
- This configuration enhances collection efficiency and maintains high-velocity measurement accuracy.
- The developed PDV head offers a robust alternative for dynamic shock wave velocity measurements.
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