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Updated: Jun 16, 2026

High-speed Particle Image Velocimetry Near Surfaces
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Two-component, self-aligning laser vector velocimeter.

W M Farmer, J O Hornkohl

    Applied Optics
    |February 4, 2010
    PubMed
    Summary
    This summary is machine-generated.

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    A new laser Doppler velocimeter uses a two-dimensional ultrasonic Bragg cell. This simplifies optics, enables two-vector velocity measurements with a single detector, and requires no alignment mirrors.

    Area of Science:

    • Fluid dynamics
    • Optical instrumentation
    • Laser Doppler velocimetry

    Background:

    • Conventional laser Doppler velocimeters often require complex optical setups.
    • Alignment mirrors in traditional velocimeters necessitate precise adjustments.
    • Measuring multiple velocity components typically demands multiple detectors.

    Purpose of the Study:

    • To describe a newly developed laser Doppler velocimeter.
    • To highlight the advantages of using a two-dimensional ultrasonic Bragg cell.
    • To demonstrate its application in atmospheric measurements.

    Main Methods:

    • Development of a novel laser Doppler velocimeter.
    • Incorporation of a two-dimensional ultrasonic Bragg cell as the core optical component.

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  • Experimental validation in an atmospheric application.

    • Main Results:

    • The new velocimeter simplifies optical requirements compared to conventional designs.
    • It enables the measurement of two-vector velocity components.
    • A single detector can capture both velocity component signals, eliminating the need for alignment mirror adjustments.

    Conclusions:

    • The developed laser Doppler velocimeter offers significant advantages in terms of optical simplicity and measurement capability.
    • The use of a two-dimensional ultrasonic Bragg cell is key to these improvements.
    • The instrument is suitable for atmospheric applications, as demonstrated by experimental results.