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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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Implementation of a Reference Interferometer for Nanodetection
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Highly stabilized optical frequency comb interferometer with a long fiber-based reference path towards arbitrary

Yoshiaki Nakajima, Kaoru Minoshima

    Optics Express
    |October 20, 2015
    PubMed
    Summary

    A novel optical frequency comb interferometer utilizes a stabilized 342-m fiber path to detect millikelvin temperature changes. This system enables precise measurement of arbitrary distances through high-precision delay length scanning.

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    Area of Science:

    • * Physics
    • * Optical Metrology
    • * Interferometry

    Background:

    • * Accurate distance measurement is crucial in various scientific and industrial applications.
    • * Fiber-based optical reference paths offer potential for high-precision measurements but are susceptible to environmental noise.
    • * Optical frequency combs provide a precise light source for interferometric measurements.

    Purpose of the Study:

    • * To develop and demonstrate an optical frequency comb interferometer with a long, stabilized fiber-based reference path.
    • * To achieve high-precision detection of small temperature variations using interferometric phase signals.
    • * To enable wide-range, high-precision delay length scanning for arbitrary distance measurements.

    Main Methods:

    • * Construction of a 342-m fiber-based optical reference path.
    • * Stabilization of the fiber path to $10^{-12}$ order stability using fiber noise cancellation.
    • * Measurement of interferometric phase signals to detect millikelvin-order temperature changes.
    • * Precise determination of pulse number differences by tuning the repetition frequency of the optical frequency comb.

    Main Results:

    • * Achieved $10^{-12}$-order stability for the long fiber-based optical reference path.
    • * Successfully detected millikelvin-order temperature changes.
    • * Precisely determined pulse number differences (30 and 61) by tuning the repetition frequency.
    • * Demonstrated 6.4-m-wide scanning for relative pulse position with 1 MHz repetition frequency tuning, enabling pulse overlap for arbitrary distances.

    Conclusions:

    • * The developed optical frequency comb interferometer with a stabilized long fiber reference path is capable of high-precision measurements.
    • * The system can accurately detect small temperature variations.
    • * The wide-range high-precision delay length scanning capability allows for the measurement of arbitrary distances.