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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...

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A Protocol for Real-time 3D Single Particle Tracking
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Optimizing a pulsed Doppler lidar.

M J Post, R E Cupp

    Applied Optics
    |June 26, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a reliable, fieldable Carbon Dioxide (CO2) lidar system for atmospheric measurements. This pulsed, coherent lidar underwent extensive characterization and performance evaluation over five years.

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    Area of Science:

    • Atmospheric physics
    • Remote sensing technology
    • Optical engineering

    Background:

    • Development of advanced remote sensing instruments is crucial for atmospheric research.
    • Pulsed, coherent lidar systems offer high-resolution atmospheric profiling capabilities.
    • The need for reliable, fieldable lidar systems for NOAA's atmospheric monitoring initiatives.

    Purpose of the Study:

    • To detail the development and characterization of NOAA's fieldable injection-seeded, pulsed, coherent Carbon Dioxide (CO2) lidar.
    • To present techniques for optimizing the performance and reliability of the CO2 lidar system.
    • To document methods for calibration, alignment, collimation, and detector/frequency stabilization.

    Main Methods:

    • Five-year development period for the injection-seeded, pulsed, coherent CO2 lidar.
    • Systematic characterization of lidar performance and reliability metrics.
    • Implementation of specific techniques for system calibration, optical alignment, and collimation.
    • Advanced methods to enhance detector performance and frequency stability.

    Main Results:

    • Successful development of a fieldable, injection-seeded, pulsed, coherent CO2 lidar system.
    • Comprehensive characterization demonstrating the system's performance and reliability.
    • Validated techniques for critical operational parameters including calibration and alignment.
    • Improvements achieved in detector sensitivity and laser frequency stability.

    Conclusions:

    • The developed CO2 lidar system is a reliable tool for atmospheric measurements.
    • The presented techniques contribute to the advancement of coherent lidar technology.
    • The system is ready for deployment in various field applications for atmospheric research.