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Dual-frequency Doppler velocimeter based on delay interferometric optical phase-locking.

Yuxiang Feng, Weilin Xie, Yinxia Meng

    Optics Letters
    |April 30, 2021
    PubMed
    Summary
    This summary is machine-generated.

    We developed a stable dual-frequency laser Doppler velocimeter (DF-LDV) using a novel dual-frequency laser source (DFLS). This system achieves high-resolution velocity measurements, even for slow-moving objects.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Laser Physics

    Background:

    • Laser Doppler Velocimetry (LDV) is a non-contact technique for measuring fluid velocity.
    • Achieving high resolution, especially for slow velocities, remains a challenge in traditional LDV systems.
    • Stability of the dual-frequency laser source (DFLS) is critical for accurate measurements.

    Purpose of the Study:

    • To present a novel dual-frequency laser Doppler velocimeter (DF-LDV) with enhanced stability and resolution.
    • To demonstrate the capability of the proposed DF-LDV for precise measurement of slow velocities.
    • To showcase the flexible tunability and robustness of the developed DFLS.

    Main Methods:

    • Generation of a stable DFLS by optical phase-locking two lasers to a common unbalanced Mach-Zehnder interferometer.
    • Evaluation of the DFLS using an optical frequency comb for large frequency separations (up to THz).
    • Demonstration of the DF-LDV system with a DFLS of ~1.024 THz separation.

    Main Results:

    • The DFLS exhibited high stability, flexible tunability, and large frequency separations up to THz.
    • The DF-LDV achieved a velocity resolution of 1.62 x 10^-2 mm/s for a slow velocity of 1.8 mm/s.
    • A short acquisition time of 5 seconds was sufficient for high-resolution measurements, indicating efficient speckle noise suppression.

    Conclusions:

    • The proposed DF-LDV system offers high precision, flexibility, and robustness.
    • This method is practical for various applications requiring accurate velocity measurements.
    • The stable DFLS generation technique is key to the system's enhanced performance.