Related Experiment Video
Updated: Jan 11, 2026
05:57
Blood Flow Imaging with Ultrafast Doppler
Published on: October 14, 2020
8.3K
Phase-based velocity extraction method for photonic Doppler velocimetry with potential higher time resolution.
Frank Jin1, Kate E Rodriguez1, Paulius Grivickas1
1Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
The Review of Scientific Instruments
|November 17, 2025
Summary
We extended the Takeda phase extraction method for photonic Doppler velocimetry. This new approach offers improved time resolution and reduced computation, benefiting high-throughput experiments.
Area of Science:
- Optics and Photonics
- Signal Processing
- Experimental Physics
Background:
- Heterodyne photonic Doppler velocimetry (PDV) is crucial for measuring high-speed phenomena.
- The short-time Fourier transform (STFT) is a common method for phase extraction in PDV but has limitations in time resolution.
- The Takeda et al. phase extraction method offers an alternative approach.
Purpose of the Study:
- To extend the Takeda phase extraction method for application in heterodyne photonic Doppler velocimetry.
- To compare the performance of the extended Takeda method with the STFT, focusing on time resolution and accuracy.
- To develop empirical equations for velocity error based on time resolution.
Main Methods:
- Extension of the Takeda phase extraction algorithm.
- Application to heterodyne photonic Doppler velocimetry data.
- Comparison with short-time Fourier transform (STFT) analysis.
- Derivation of empirical equations relating velocity error to time resolution.
Main Results:
- The extended Takeda method provides results comparable to STFT.
- The Takeda method offers potential improvements in time resolution.
- Uniform data utilization in the Takeda method allows direct correlation of velocity error with time resolution.
- Simulations and experiments confirm consistent velocity errors for a given time resolution across both methods.
Conclusions:
- The extended Takeda method is a valuable tool for heterodyne PDV.
- Its advantages include higher potential time resolution and reduced computational load.
- This makes it suitable for high-throughput applications like laser dynamic compression experiments.
Related Concept Videos
01:05Doppler Effect - II
4.3K
The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
4.3K
00:56Doppler Effect - I
6.0K
The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
6.0K