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Related Concept Videos

Sound as Pressure Waves01:17

Sound as Pressure Waves

4.8K
Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
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Measurement of Fluid Pressure01:16

Measurement of Fluid Pressure

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Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...
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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
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Imaging local acoustic pressure in microchannels.

Jorick Van't Oever, Raimond Frentrop, Daniel Wijnperlé

    Applied Optics
    |September 15, 2015
    PubMed
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    Researchers developed a new method to map acoustic fields in microchannels using light refraction. This technique visualizes pressure waves and their properties, aiding in understanding microfluidic acoustics.

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    Area of Science:

    • Acoustic physics
    • Microfluidics
    • Optical measurement techniques

    Background:

    • Understanding acoustic fields in microchannels is crucial for microfluidic applications.
    • Traditional methods for acoustic field measurement can be complex and invasive.

    Purpose of the Study:

    • To present a novel method for determining the spatially resolved acoustic field within a water-filled microchannel.
    • To measure both the amplitude and phase of the acoustic field.
    • To characterize acoustic resonances and their properties.

    Main Methods:

    • Utilized stroboscopic illumination to measure changes in the refractive index of water caused by local pressure variations.
    • Measured pressure distributions for fundamental and higher harmonic acoustic resonance modes.
    • Combined measurements across a range of excitation frequencies to create a frequency map of modes.

    Main Results:

    • Successfully mapped the acoustic field, including amplitude and phase, within the microchannel.
    • Identified and characterized fundamental and higher harmonic pressure resonance modes.
    • Obtained spectral line width and Q-factor for individual acoustic resonances.

    Conclusions:

    • The presented method provides a non-invasive way to visualize and quantify acoustic fields in microchannels.
    • This technique enables detailed characterization of acoustic resonances, crucial for optimizing microfluidic devices.
    • The frequency map approach allows for comprehensive analysis of acoustic mode behavior.