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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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High-speed range and velocity measurement using frequency scanning interferometry with adaptive delay lines

Christos A Pallikarakis, Jonathan M Huntley, Pablo D Ruiz

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |November 11, 2020
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a frequency scanning interferometer for precise measurement of target range, displacement, and velocity. It achieves sub-nanometer displacement resolution and sub-100-nm range resolution using a novel adaptive delay line.

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    Area of Science:

    • Optical Metrology
    • Interferometry
    • Laser Technology

    Background:

    • Accurate measurement of target range, displacement, and velocity is crucial in various scientific and industrial applications.
    • Traditional interferometry methods face challenges in achieving high resolution and broad measurement ranges.

    Purpose of the Study:

    • To develop and demonstrate a frequency scanning interferometer for high-resolution, wide-range measurement of target motion.
    • To improve measurement accuracy and reduce modulation frequencies using an adaptive delay line.

    Main Methods:

    • Utilized a frequency scanning interferometer with a vertical-cavity surface-emitting laser (100 nm tuning range, 100,000 scans/s).
    • Incorporated an adaptive delay line in the reference beam to reduce modulation frequencies to sub-gigahertz levels.
    • Determined range, displacement, and velocity from the interference signal's phase, with fine alignment from a reference interferometer.

    Main Results:

    • Achieved sub-nanometer displacement resolution.
    • Demonstrated sub-100-nm range resolution.
    • Obtained velocity resolution of 12µms⁻¹ over a 300 mm depth measurement range.

    Conclusions:

    • The developed frequency scanning interferometer offers high precision for measuring target motion.
    • The adaptive delay line effectively reduces modulation frequencies, enhancing system performance.
    • This technology has potential applications in precision engineering, scientific research, and industrial inspection.