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Related Concept Videos

Doppler Effect - II01:05

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 - I00:56

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...
Assessing Blood pressure using a doppler ultrasound01:19

Assessing Blood pressure using a doppler ultrasound

To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:

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Updated: Jun 7, 2026

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
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Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

Published on: June 25, 2021

A novel, multichannel, comb-frequency Doppler backscatter system.

W A Peebles1, T L Rhodes, J C Hillesheim

  • 1University of California, Los Angeles, California 90095, USA. peebles@physics.ucla.edu

The Review of Scientific Instruments
|November 2, 2010
PubMed
Summary
This summary is machine-generated.

A new multichannel Doppler backscattering system monitors plasma turbulence and flow at eight locations in fusion devices. This V-band system provides simultaneous measurements, enhancing understanding of plasma dynamics during transitions like the L-H transition.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Diagnostic techniques

Background:

  • Doppler backscattering is a key diagnostic for high-temperature fusion plasmas.
  • It measures plasma turbulence, flow, and electric fields.
  • Previous systems lacked multichannel capabilities for simultaneous spatial measurements.

Purpose of the Study:

  • To develop a stable, multichannel Doppler backscattering system.
  • To enable simultaneous monitoring of turbulent flows and fluctuation levels at multiple spatial locations.
  • To investigate plasma dynamics during events like the L-H transition.

Main Methods:

  • A novel V-band (50-75 GHz) system was created.
  • It utilizes a high-frequency, low phase noise comb-frequency generator.
  • A filter bank and quadrature detection system were employed for multichannel analysis.

Main Results:

  • The system enables simultaneous monitoring at eight distinct spatial locations.
  • It is operational on the DIII-D tokamak.
  • Flow and turbulence levels across the plasma radius are now monitored.

Conclusions:

  • The developed system enhances the diagnostic capabilities for fusion plasmas.
  • Simultaneous, multi-point measurements provide deeper insights into plasma behavior.
  • This technology aids in studying critical plasma phenomena such as the L-H transition.