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Extensometer

  • Living reference work entry
  • First Online:
Encyclopedia of Engineering Geology

Part of the book series: Encyclopedia of Earth Sciences Series ((EESS))

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Synonyms

Extensometer

Definition

The extensometer is an instrument designed to measure the distance separating two fixed points by determining extension or contraction of a connecting element under stress which is temporarily or permanently attached to the fixed points.

Characteristics

The first such instrument was designed to measure deformation of iron rods during fatigue testing (Huston 1879). There are other instruments allowing determination of distance between fixed points by direct distance measurements (e.g., precision tape; laser distance meters; electronic distance meters) without using connecting element under tension.

Repeated readings are required to detect changes of the connecting element length which indicates relative displacement of the fixed points with respect to each other. Determination of their movement vector or total displacement requires additional information which cannot be provided by the...

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References

  • Corominas J, Moya J, Lloret A, Gili JA, Angeli MG, Pasuto A, Silvano S (2000) Measurement of landslide displacements using a wire extensometer. Eng Geol 55:146–166

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  • Huston C (1879) The effect of continued and progressively increasing strain upon iron. J Frankl Inst 107:41–44

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  • Lin CP, Tang SH (2005) Development and calibration of TDR extensometer for geotechnical monitoring. Geotech Test J 28(5) online astm.org

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Author information

Authors and Affiliations

  1. Institute of Rock Structure and Mechanics, Czech Academy of Sciences, V Holešovičkách 41, 18209, Prague, Czech Republic

    Jan Klimeš

Authors
  1. Jan Klimeš
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Corresponding author

Correspondence to Jan Klimeš .

Editor information

Editors and Affiliations

  1. Department of Earth Sciences, Simon Fraser University, Kanata, Ontario, Canada

    Peter T. Bobrowsky

  2. London, United Kingdom

    Brian Marker

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© 2016 Springer International Publishing AG

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Klimeš, J. (2016). Extensometer. In: Bobrowsky, P., Marker, B. (eds) Encyclopedia of Engineering Geology. Encyclopedia of Earth Sciences Series. Springer, Cham. https://doi.org/10.1007/978-3-319-12127-7_119-1

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  • DOI: https://doi.org/10.1007/978-3-319-12127-7_119-1

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  • Publisher Name: Springer, Cham

  • Online ISBN: 978-3-319-12127-7

  • eBook Packages: Springer Reference Earth and Environm. ScienceReference Module Physical and Materials ScienceReference Module Earth and Environmental Sciences

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