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In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Updated: Jun 23, 2026

Cerenkov Luminescence Imaging of Interscapular Brown Adipose Tissue
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Active Imaging through Cirrus Clouds.

B Landesman, P Kindilien, R Pierson

    Optics Express
    |April 21, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Cirrus clouds, even thin ones invisible from the ground, significantly impact active imaging systems by scattering and attenuating light. This study analyzes their effects using field data and simulations.

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    Determining 3D Flow Fields via Multi-camera Light Field Imaging
    14:25

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    Published on: March 6, 2013

    Area of Science:

    • Atmospheric optics
    • Remote sensing
    • Optical engineering

    Background:

    • Active imaging systems rely on illumination beams for target detection and characterization.
    • Ice particle clouds, particularly subvisual cirrus, can interfere with optical beam propagation.
    • Understanding cloud effects is crucial for reliable active imaging performance.

    Purpose of the Study:

    • To investigate the impact of cirrus clouds on active imaging system performance.
    • To analyze how cloud optical depth influences beam scattering, attenuation, and depolarization.
    • To assess the feasibility of active imaging in the presence of cirrus clouds.

    Main Methods:

    • Analysis of field data from a past active imaging experiment.
    • Simulation of coherent illumination interaction with cirrus cloud models.
    • Evaluation of beam properties (attenuation, scattering, depolarization) after cloud passage.

    Main Results:

    • Observed effects in field data consistent with cirrus cloud interference.
    • Simulations confirmed the detrimental influence of cirrus clouds on beam characteristics.
    • Subvisual cirrus clouds were shown to alter beam properties and alignment.

    Conclusions:

    • Cirrus clouds pose a significant challenge to active imaging systems.
    • Both field data and simulations support the conclusion of cirrus cloud impact.
    • Further research is needed to mitigate these effects for robust active imaging.