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Related Concept Videos

Measurement of Fluid Pressure01:16

Measurement of Fluid Pressure

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...
Viscosity of Fluid01:19

Viscosity of Fluid

Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.

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Probing a fluid through a distorting interface using a monostatic fiber-optic Doppler velocimeter.

R Bättig, W Hodel, R Stierlin

    Applied Optics
    |June 12, 2010
    PubMed
    Summary

    This study explores a Doppler velocimeter using optical fiber for blood velocity assessment. Results show potential for measuring blood flow in thin, superficial vessels, particularly in medical applications.

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    Area of Science:

    • Biomedical Engineering
    • Optical Physics
    • Medical Diagnostics

    Background:

    • Doppler velocimetry is crucial for non-invasive blood flow measurement.
    • Optical fiber technology offers advantages in probe beam delivery and signal collection.
    • Surface scattering can significantly impact Doppler velocimeter performance.

    Purpose of the Study:

    • To theoretically and experimentally investigate a single-mode optical fiber Doppler velocimeter.
    • To analyze the impact of probe beam distortion on velocimeter performance.
    • To assess the feasibility of using this velocimeter for medical blood velocity assessment.

    Main Methods:

    • Developed a theoretical model for the optical fiber Doppler velocimeter.
    • Conducted experimental studies using the velocimeter.
    • Evaluated performance under conditions of negligible and strong probe beam distortion due to surface scattering.

    Main Results:

    • The optical fiber Doppler velocimeter demonstrated functionality in transmitting probe beams and collecting signal light.
    • Performance was analyzed considering varying degrees of surface scattering-induced probe beam distortion.
    • Feasibility of assessing blood velocity in thin, superficial vessels was indicated.

    Conclusions:

    • Single-mode optical fiber Doppler velocimetry is a viable technique for blood flow analysis.
    • Understanding and mitigating surface scattering effects are important for accurate measurements.
    • The system shows promise for non-invasive assessment of blood velocity in specific medical contexts.