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Related Concept Videos

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
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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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Published on: August 12, 2013

Optically phase-locked electronic speckle pattern interferometer.

S E Moran, R L Law, P N Craig

    Applied Optics
    |May 11, 2010
    PubMed
    Summary
    This summary is machine-generated.

    An optically phase-locked electronic speckle pattern interferometer (OPL-ESPI) enables real-time Doppler contour generation for moving objects on unstable platforms. This novel system integrates an optical phase-locked loop with advanced signal processing for enhanced measurement capabilities.

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    Area of Science:

    • Optics
    • Interferometry
    • Signal Processing

    Background:

    • Electronic Speckle Pattern Interferometry (ESPI) is sensitive to environmental vibrations.
    • Stable sensor platforms are typically required for accurate ESPI measurements.
    • Real-time measurement of moving objects presents significant challenges.

    Purpose of the Study:

    • To describe the design, theory, operation, and characteristics of an optically phase-locked electronic speckle pattern interferometer (OPL-ESPI).
    • To enable real-time equal Doppler speckle contour generation of moving objects from unstable sensor platforms.
    • To introduce a novel ESPI video signal processing technique.

    Main Methods:

    • Coupling an optical phase-locked loop (OPL) with an ESPI system.
    • Utilizing the OPL for real-time Doppler speckle contour generation.
    • Implementing a new ESPI video signal processing technique involving local oscillator phase shifting and video sequential frame subtraction.

    Main Results:

    • The OPL-ESPI system successfully generates real-time equal Doppler speckle contours.
    • The system operates effectively even on unstable sensor platforms.
    • The novel signal processing technique enhances ESPI measurement capabilities.

    Conclusions:

    • The OPL-ESPI system offers a robust solution for measuring moving objects in dynamic environments.
    • The integration of OPL technology significantly improves the stability and applicability of ESPI.
    • This advancement opens new possibilities for real-time metrology in challenging conditions.