相关实验视频

Updated: Jan 11, 2026

Blood Flow Imaging with Ultrafast Doppler

Blood Flow Imaging with Ultrafast Doppler

Published on: October 14, 2020

基于相位的速度提取方法用于光子多普勒速度计,具有潜在的更高时间分辨率

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

概括

我们将Takeda相位提取方法扩展到光子多普勒速度计. 这种新方法提供了改进的时间分辨率和减少的计算,有利于高通量实验.

科学领域:

光学和光子学在光学和光子学.
信号处理信号处理
实验物理实验物理学

背景情况:

异质光子多普勒速度计 (PDV) 对于测量高速现象至关重要.
短时间里叶变换 (STFT) 是 PDV 中相提取的常用方法,但在时间分辨率方面存在局限性.
塔克达和其他人. 阶段提取方法提供了一个替代方法.

研究的目的:

扩展塔凯达相位提取方法,用于异体光子多普勒速度计.
将扩展的Takeda方法与STFT的性能进行比较,重点关注时间分辨率和准确性.
开发基于时间分辨率的速度误差的经验方程.

主要方法:

拓达相提取算法的扩展.
适用于异质光子多普勒速度计数据的应用.
与短时间里埃变换 (STFT) 分析进行比较.
导出与速度误差与时间分辨率相关的经验方程.

主要成果:

扩展的Takeda方法提供了与STFT.相似的结果.
塔克达的方法在时间分辨率方面提供了潜在的改进.
在Takeda方法中统一的数据利用允许速度误差与时间分辨率的直接相关性.
模拟和实验证实了在两种方法中给定时间分辨率的一致速度误差.

结论:

扩展的Takeda方法是异质PDV的一个有价值的工具.
它的优点包括更高的潜在时间分辨率和更低的计算负载.
这使得它适用于像激光动态压缩实验这样的高通量应用.

更多相关视频

High-speed Particle Image Velocimetry Near Surfaces

High-speed Particle Image Velocimetry Near Surfaces

Published on: June 24, 2013

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

Published on: December 22, 2015

相关概念视频

Doppler Effect - II

Doppler Effect - II

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...

Doppler Effect - I

Doppler Effect - I

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...