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Related Experiment Video

Updated: Jun 14, 2026

Measurement of Compressive Stress-Strain Response at Small-Strains

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

|March 24, 2010

Summary

This summary is machine-generated.

A novel vacuum-pipeless laser strainmeter effectively measures Earth

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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.