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Related Concept Videos

Phase Contrast and Differential Interference Contrast Microscopy01:26

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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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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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High-speed imaging of sound using parallel phase-shifting interferometry.

Kenji Ishikawa, Kohei Yatabe, Nachanant Chitanont

    Optics Express
    |July 14, 2016
    PubMed
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    This study demonstrates parallel phase-shifting interferometry (PPSI) with a high-speed polarization camera for advanced sound field imaging. The technique successfully visualized instantaneous sound fields, enabling precise acoustical analysis.

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    Area of Science:

    • Acoustics
    • Optical Metrology
    • Wave Phenomena

    Background:

    • Sound field imaging visualizes spatial and temporal acoustical properties like sound pressure.
    • Understanding acoustical phenomena is crucial in various scientific and engineering fields.

    Purpose of the Study:

    • To investigate the application of parallel phase-shifting interferometry (PPSI) for sound field imaging.
    • To achieve high-speed imaging of propagating sound waves using a high-speed polarization camera.

    Main Methods:

    • Utilized parallel phase-shifting interferometry (PPSI).
    • Employed a high-speed polarization camera for optical detection.
    • Generated sound fields using ultrasonic transducers driven by a 40 kHz pure tone.

    Main Results:

    • Successfully performed quantitative imaging of an instantaneous sound field.
    • Demonstrated the capability to capture high-speed dynamics of sound waves.
    • Validated the accuracy of the sound pressure measurements.

    Conclusions:

    • Parallel phase-shifting interferometry (PPSI) is effective for sound field imaging.
    • The method is suitable for acoustical applications requiring precise spatial sound pressure information.
    • High-speed polarization cameras enhance the temporal resolution of sound field visualization.