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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

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:
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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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Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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Two-color dual-beam backscatter laser Doppler velocimeter.

G R Grant, K L Orloff

    Applied Optics
    |February 4, 2010
    PubMed
    Summary

    This study introduces a new laser Doppler velocimeter for measuring airflow in wind tunnels. The system simultaneously captures orthogonal velocities, enabling detailed analysis of complex flow patterns.

    Area of Science:

    • Fluid Dynamics
    • Optical Measurement Techniques
    • Aerospace Engineering

    Background:

    • Accurate measurement of airflow is crucial for aerodynamic research.
    • Traditional velocimetry methods can be limited in complex or unstable flow fields.
    • Simultaneous measurement of orthogonal velocities is challenging but provides comprehensive flow data.

    Purpose of the Study:

    • To develop and present a novel laser Doppler velocimeter (LDV) system.
    • To enable simultaneous measurement of orthogonal velocities in a wind tunnel.
    • To demonstrate the system's capability in analyzing spatially unstable flows.

    Main Methods:

    • Utilized an argon-ion laser emitting two distinct colors for dual-beam interferometry.
    • Designed a traversing optical system for focal volume repositioning within the wind tunnel.

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  • Implemented a laser Doppler velocimeter setup for orthogonal velocity component acquisition.

    • Main Results:

    • Successfully developed an LDV system capable of simultaneous orthogonal velocity measurements.
    • Demonstrated the system's ability to traverse unstable flow fields at speeds up to 1.5 m/sec.
    • Presented data from a traversal of a trailing wing-tip vortex, showcasing flow characteristics.

    Conclusions:

    • The developed LDV system offers a robust solution for detailed aerodynamic flow analysis.
    • The system's capability to measure orthogonal velocities in unstable flows enhances understanding of complex phenomena.
    • This technology advances wind tunnel testing capabilities for aerodynamic research.