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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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Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
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A drone flying through complex terrain often relies on more than one sensing method to estimate small changes in altitude. Along with direct measurements, air pressure provides a useful indirect indicator of vertical movement. Atmospheric pressure decreases as altitude increases, and this relationship is commonly described using an exponential model. Although accurate, converting pressure measurements into altitude values requires calculations that are too complex to perform repeatedly during...
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Implementation of a Reference Interferometer for Nanodetection
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Frequency-scanning interferometry for dynamic absolute distance measurement using Kalman filter.

Long Tao, Zhigang Liu, Weibo Zhang

    Optics Letters
    |December 16, 2014
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a Kalman filter-enhanced frequency-scanning interferometry for precise, dynamic absolute distance measurement. The novel method accurately tracks targets even during vibration or movement.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Control Systems Engineering

    Background:

    • Traditional frequency-scanning interferometry struggles with dynamic measurement errors.
    • Accurate real-time distance determination is crucial in various industrial and scientific applications.
    • Existing methods often lack precision or are overly complex for dynamic scenarios.

    Purpose of the Study:

    • To develop a robust frequency-scanning interferometry technique for dynamic absolute distance measurement.
    • To integrate Kalman filtering for improved accuracy and error compensation.
    • To enable high-precision, low-complexity measurements of moving targets.

    Main Methods:

    • Utilizing a single tunable laser with triangle waveform for bidirectional optical frequency scanning.
    • Applying the Kalman filter algorithm to estimate absolute distance and target velocity.
    • Combining real-time measurements with previous state estimations for dynamic compensation.

    Main Results:

    • Successfully demonstrated dynamic absolute distance measurement under static, vibration, and linear motion conditions.
    • Achieved high-precision measurements by effectively compensating for movement-induced errors.
    • Validated the low-complexity and effectiveness of the Kalman filtering approach.

    Conclusions:

    • The proposed Kalman filter-based frequency-scanning interferometry offers a significant advancement for dynamic absolute distance measurement.
    • This method provides a reliable and accurate solution for real-time tracking of targets in motion.
    • The technique paves the way for enhanced precision in metrology and related fields.