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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...
Distance Measurements by Taping01:18

Distance Measurements by Taping

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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Related Experiment Video

Updated: Jun 8, 2026

A Multimodal Wide-Field Fourier-Transform Raman Microscope
06:48

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

Streak-camera-based long-distance range finder with 10(-7) resolution.

M Takeichi, Y Warashina, A Takeshima

    Applied Optics
    |October 2, 2010
    PubMed
    Summary

    A new optical distance meter using a pulsed laser and streak cameras achieves 1 cm resolution over 30 km. This precise geophysical tool monitors tectonic plate movement, finding no predicted shift between Asian and Philippine plates.

    Related Experiment Videos

    Last Updated: Jun 8, 2026

    A Multimodal Wide-Field Fourier-Transform Raman Microscope
    06:48

    A Multimodal Wide-Field Fourier-Transform Raman Microscope

    Published on: December 30, 2025

    Area of Science:

    • Geophysics
    • Optical Engineering
    • Laser Technology

    Background:

    • Accurate distance measurements are crucial for geophysical applications, including tectonic plate monitoring.
    • Traditional methods face limitations in precision and range due to atmospheric interference and timing errors.

    Purpose of the Study:

    • To develop a novel optical distance meter with high intrinsic resolution and accuracy.
    • To assess and improve the performance of single-wavelength versus multi-wavelength methods for field applications.
    • To apply the developed technology for monitoring the relative translational shift of the Asian (Eurasian) and Philippine plates.

    Main Methods:

    • Development of an optical distance meter utilizing a pulsed yttrium aluminum garnet laser and streak cameras.
    • Implementation of an optical-registration-clock pulse to minimize timing errors and enhance intrinsic resolution to 3 mm.
    • Comparison of multi-wavelength and single-wavelength ranging methods, with careful atmospheric parameter correction using the equipotential temperature criterion.

    Main Results:

    • Achieved an intrinsic resolution of 3 mm for the optical distance meter.
    • Demonstrated that the single-wavelength method, with corrections, significantly outperforms the multi-wavelength method for field applications.
    • Attained a resolution better than 1 cm over a 30 km range, corresponding to a relative resolution of 3 × 10⁻⁷.
    • Applied the meter to monitor tectonic plate movement, revealing an absence of the predicted translational shift between the Asian (Eurasian) and Philippine plates.

    Conclusions:

    • The novel optical distance meter offers unprecedented precision for geophysical measurements.
    • Atmospheric parameter correction is vital for achieving high-resolution, long-range distance measurements.
    • The technology provides a valuable tool for geodetic monitoring, with current data indicating no significant shift between the studied tectonic plates.