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Related Concept Videos

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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How to Build a Laser Speckle Contrast Imaging (LSCI) System to Monitor Blood Flow
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Published on: November 11, 2010

Two-color two-spot laser velocimeter.

H B Barnes, W M Farmer

    Applied Optics
    |March 18, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel two-color laser velocimeter uses an argon laser to measure two flow components simultaneously. This system, tested at up to 150 m, offers advanced fluid dynamics measurement capabilities.

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    Area of Science:

    • Fluid dynamics
    • Optical instrumentation
    • Laser technology

    Background:

    • Laser velocimetry is crucial for non-intrusive flow measurement.
    • Existing systems may have limitations in measuring multi-component flows or operating range.

    Purpose of the Study:

    • To present the design of a two-color, two-spot laser velocimeter.
    • To enable simultaneous measurement of two flow velocity components.
    • To evaluate the system's performance at various distances.

    Main Methods:

    • Utilized an argon laser source.
    • Employed a prism assembly to split the beam into 514.5 nm and 488.0 nm wavelengths.
    • Configured a two-spot system for dual-component measurement using backscattered light.
    • Tested the velocimeter at 50 m, 100 m, and 150 m ranges.

    Main Results:

    • Successfully demonstrated a two-color, two-spot laser velocimeter design.
    • Validated the capability to measure two components of a flow.
    • Presented performance data from tests conducted at 50, 100, and 150 m.

    Conclusions:

    • The developed laser velocimeter is effective for measuring multi-component flows.
    • The system shows potential for remote, non-intrusive fluid dynamics analysis.
    • Further applications in various flow measurement scenarios are suggested.