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Phase-shift laser range finder technique based on optical carrier phase modulation.

Hongyu He, Jianfeng Sun, Zhiyong Lu

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    |June 17, 2020
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    This summary is machine-generated.

    This study presents a novel coherent laser range finder that precisely measures both distance and velocity simultaneously using optical phase modulation. Preliminary tests show high accuracy for moving targets, advancing laser ranging technology.

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    Area of Science:

    • Optoelectronics and Photonics
    • Laser Technology
    • Measurement Science

    Background:

    • Traditional laser range finders often measure range or velocity separately, limiting simultaneous high-precision applications.
    • Optical phase modulation and phase shift measurement are key techniques in advanced distance measurement systems.

    Purpose of the Study:

    • To introduce a novel coherent laser range finder design.
    • To enable simultaneous, high-precision measurement of both range and velocity.
    • To develop and validate an algorithm for calculating range and velocity.

    Main Methods:

    • Employed an electro-optic phase modulator with a 20 MHz sine signal for laser modulation.
    • Utilized a 90° optical hybrid for mixing the received laser with a local oscillator.
    • Developed a specific algorithm for simultaneous range and velocity computation.

    Main Results:

    • Achieved simultaneous high-precision measurement of range and velocity.
    • Demonstrated root mean square errors of 9.35×10-4 m for range and 4.74×10-4 m/s for velocity at a 100 kHz measurement rate.
    • Preliminary experiments on moving targets validated the system's performance.

    Conclusions:

    • The proposed coherent laser range finder offers simultaneous high-precision range and velocity measurement capabilities.
    • The developed algorithm and system architecture are effective for dynamic target tracking.
    • This technology advances the field of laser ranging for applications requiring dual-parameter measurement.