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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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UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
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.
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
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Laser Doppler velocimetry using a superheterodyne spectrum analyzer.

J Leblond, el S E Badawy

    Applied Optics
    |February 6, 2010
    PubMed
    Summary

    We developed a novel superheterodyne optical spectrum analyzer using an acoustooptic modulator. This instrument analyzes scattered light from rotating cylinders, revealing spectrum width dependence on angular velocity, scattering angles, and illuminated area dimensions.

    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Acousto-optics

    Background:

    • Superheterodyne techniques are crucial for high-resolution spectral analysis.
    • Optical spectrum analyzers are vital tools in various scientific and industrial applications.
    • Characterizing scattered light from dynamic objects requires advanced analytical methods.

    Purpose of the Study:

    • To introduce a novel superheterodyne optical spectrum analyzer (SOSA).
    • To investigate the power spectrum of light scattered by a rotating cylinder.
    • To establish the relationship between spectrum width and key physical parameters.

    Main Methods:

    • Development of a SOSA employing a linearly chirped local oscillator frequency generated by an acoustooptic modulator.
    • Analysis of the power spectrum of light scattered from a rotating cylinder.

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  • Derivation of a theoretical expression for the power spectrum.

    • Main Results:

    • The SOSA successfully analyzed the power spectrum of scattered light.
    • A theoretical model was established linking spectrum width to experimental parameters.
    • Spectrum width was found to be dependent on cylinder angular velocity, scattering angles, and illuminated area dimensions.

    Conclusions:

    • The developed SOSA is effective for analyzing dynamic scattering phenomena.
    • The theoretical framework provides a basis for understanding scattered light spectra.
    • Precise control over scattering conditions allows for detailed spectral analysis.