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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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Related Experiment Video

Updated: Jul 8, 2026

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
06:16

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing

Published on: April 25, 2019

Coherent-burst laser ranging: decoupling resolution and unambiguous range.

E A Wachter, W G Fisher

    Optics Letters
    |April 15, 1997
    PubMed
    Summary

    A new coherent-burst laser ranging method uses modulated light bursts for precise distance measurements. This technique accurately determines both time of flight and phase shift, overcoming aliasing issues for reliable ranging.

    Area of Science:

    • Optoelectronics
    • Metrology
    • Signal Processing

    Background:

    • Traditional laser ranging methods face limitations in precision and range.
    • Accurate distance measurement is crucial for applications in robotics, surveying, and autonomous systems.

    Purpose of the Study:

    • To introduce and validate a novel signal encoding and decoding method for high-precision laser ranging.
    • To demonstrate the effectiveness of the coherent-burst method across various distances.

    Main Methods:

    • The coherent-burst method employs a quasi-continuous interrupted burst of modulated laser radiation.
    • Amplitude modulation with electronic coherence to a master oscillator is used to determine time of flight and phase shift.
    • High-frequency modulation (over 250 MHz) and temporal delay measurements are utilized for precision and aliasing elimination.

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    Related Experiment Videos

    Last Updated: Jul 8, 2026

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    Published on: April 25, 2019

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    Main Results:

    • Experimental demonstration of the coherent-burst method using low-power diode lasers.
    • Achieved high-precision ranging capabilities at all distances.
    • Successfully eliminated potential uncertainty from aliasing through temporal delay measurements.

    Conclusions:

    • The coherent-burst method offers a robust solution for high-precision laser ranging.
    • The technique is suitable for implementation with readily available low-power diode lasers.
    • This advancement has the potential to improve various distance-dependent measurement applications.