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

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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:
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...

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Related Experiment Video

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Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
08:54

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Published on: February 13, 2018

Continuous-wave bistatic laser Doppler wind sensor.

M Harris1, G Constant, C Ward

  • 1Sensors and Electronics Division, Defence Evaluation and Research Agency, Malvern, Worcestershire WR14 3PS, UK. mharris@dera.gov.uk

Applied Optics
|March 22, 2008
PubMed
Summary
This summary is machine-generated.

A new coherent laser radar system uses a fiber amplifier for 1-W output, enabling reliable Doppler wind-speed detection up to 200m. Its bistatic design precisely localizes wind measurements, reducing spurious signals in challenging conditions.

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Area of Science:

  • Optics and Photonics
  • Atmospheric Science
  • Laser Technology

Background:

  • Laser radar (lidar) systems are crucial for atmospheric measurements.
  • Coherent detection offers high sensitivity for Doppler measurements.
  • Existing systems may face challenges with signal specificity and localization.

Purpose of the Study:

  • To develop and characterize a novel coherent laser radar system.
  • To evaluate the performance of a bistatic configuration for Doppler wind-speed detection.
  • To investigate the advantages of a well-defined probe volume for precise wind measurements.

Main Methods:

  • Construction of a laser radar using a semiconductor master oscillator and an erbium-doped fiber amplifier.
  • Implementation of a bistatic optical layout with single-mode optical fiber routing.
  • Experimental validation of Doppler wind-speed detection capabilities and comparison with theoretical models.

Main Results:

  • Achieved approximately 1-W output power at 1.55 micrometers.
  • Demonstrated reliable Doppler wind-speed detection up to 200 meters in moderate scattering conditions.
  • Observed advantages of the bistatic configuration in localizing the probe volume and reducing spurious signals.

Conclusions:

  • The developed coherent laser radar system is effective for localized wind-speed measurements.
  • The bistatic configuration offers benefits for applications requiring precise spatial wind data.
  • Further theoretical and experimental studies confirm the signal strength reduction in bistatic compared to monostatic systems.