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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 14, 2026

Measurement of Compressive Stress-Strain Response at Small-Strains
02:58

Measurement of Compressive Stress-Strain Response at Small-Strains

Published on: December 5, 2025

Vacuum-pipeless laser earth strainmeter.

T Ohishi, S Seino, Y Sakurai

    Applied Optics
    |March 24, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel vacuum-pipeless laser strainmeter effectively measures Earth

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    Last Updated: Jun 14, 2026

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    Area of Science:

    • Geophysics
    • Optical instrumentation

    Background:

    • Traditional strainmeters face challenges with environmental factors.
    • Accurate measurement of crustal deformation is crucial.

    Purpose of the Study:

    • To design and test a vacuum-pipeless laser strainmeter.
    • To compensate for environmental effects on measurements.

    Main Methods:

    • Utilized a laser strainmeter design.
    • Implemented a compensator based on Edlén's formula.
    • Measured atmospheric pressure and temperature.

    Main Results:

    • Compensated for air refractive index changes.
    • Achieved residual effects below +/-5 x 10(-9) over 75 hours.
    • Successfully recorded solid tidal strains.

    Conclusions:

    • The vacuum-pipeless laser strainmeter offers high precision.
    • Environmental compensation is effective for accurate geophysical measurements.