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Related Concept Videos

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

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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...
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Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

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When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
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Related Experiment Video

Updated: May 1, 2026

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Absolute distance measurement by dual-comb nonlinear asynchronous optical sampling.

Hongyuan Zhang, Haoyun Wei, Xuejian Wu

    Optics Express
    |March 26, 2014
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a dual-comb nonlinear asynchronous optical sampling method for simplified absolute length measurements. The technique enhances the non-ambiguity range and improves precision in time interval determination.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Laser Physics

    Background:

    • Accurate absolute length measurements are crucial in various scientific and industrial applications.
    • Traditional methods face limitations in extending the non-ambiguity range and simplifying time interval determination.

    Purpose of the Study:

    • To propose a simplified dual-comb nonlinear asynchronous optical sampling method for absolute length measurements.
    • To enhance the non-ambiguity range and improve the accuracy of time interval determination.

    Main Methods:

    • Utilizing a dual-comb nonlinear asynchronous optical sampling technique.
    • Employing Type II second harmonic generation for precise time interval determination between pulses.
    • Adjusting the signal laser's repetition rate to extend the non-ambiguity range.

    Main Results:

    • Achieved a maximum residual of 100.6 nm and an uncertainty of 1.48 μm within 0.5 ms acquisition time.
    • Reduced uncertainty to 166.6 nm (50 ms) and 82.9 nm (500 ms) with increased acquisition time.
    • Demonstrated extension of the non-ambiguity range for measuring distances beyond inherent limitations.

    Conclusions:

    • The proposed dual-comb method offers a simplified approach to absolute length metrology.
    • The technique effectively extends the non-ambiguity range and enhances measurement precision.
    • This method presents a viable alternative to conventional heterodyne interferometry for advanced length measurements.