Technologies 2014, 2(3), 115-128; doi:10.3390/technologies2030115
Article

Crustal Strain Observation Using a Two-Color Interferometer with Accurate Correction of Refractive Index of Air

Received: 30 April 2014; in revised form: 23 June 2014 / Accepted: 24 June 2014 / Published: 4 July 2014
(This article belongs to the Special Issue Precision Measurements and Metrology Using Lasers)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: A highly accurate two-color interferometer with automatic correction of the refractive index of air was developed for crustal strain observation. The two-color interferometer, which can measure a geometrical distance of approximately 70 m, with a relative resolution of 2 × 10−9, clearly detected a change in strain due to earth tides in spite of optical measurement in air. Moreover, a large strain quake due to an earthquake could be observed without disturbing the measurement. We demonstrated the advantages of the two-color interferometer in air for geodetic observation.
Keywords: two-color interferometer; heterodyne interferometer; refractive index of air; distance measurement; strain observation
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MDPI and ACS Style

Telada, S.; Araya, A.; Takamori, A. Crustal Strain Observation Using a Two-Color Interferometer with Accurate Correction of Refractive Index of Air. Technologies 2014, 2, 115-128.

AMA Style

Telada S, Araya A, Takamori A. Crustal Strain Observation Using a Two-Color Interferometer with Accurate Correction of Refractive Index of Air. Technologies. 2014; 2(3):115-128.

Chicago/Turabian Style

Telada, Souichi; Araya, Akito; Takamori, Akiteru. 2014. "Crustal Strain Observation Using a Two-Color Interferometer with Accurate Correction of Refractive Index of Air." Technologies 2, no. 3: 115-128.

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