Technologies 2014, 2(3), 115-128; doi:10.3390/technologies2030115
Crustal Strain Observation Using a Two-Color Interferometer with Accurate Correction of Refractive Index of Air
1
National Institute of Advanced Industrial Science and Technology, 1-1-1, Umezono, Tsukuba, Ibaraki 305-8563, Japan
2
Earthquake Research Institute, University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
*
Author to whom correspondence should be addressed.
Received: 30 April 2014 / Revised: 23 June 2014 / Accepted: 24 June 2014 / Published: 4 July 2014
(This article belongs to the Special Issue Precision Measurements and Metrology Using Lasers)
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
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
Scifeed alert for new publications
Never miss any articles matching your research from any publisher- Get alerts for new papers matching your research
- Find out the new papers from selected authors
- Updated daily for 49'000+ journals and 6000+ publishers
- Define your Scifeed now
Share & Cite This Article
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.
Related Articles
Article Metrics
Comments
[Return to top]
Technologies
EISSN 2227-7080
Published by MDPI AG, Basel, Switzerland
RSS
E-Mail Table of Contents Alert