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      Fibre Optic System for Monitoring Rotational Seismic Phenomena

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          Abstract

          We outline the development and the application in a field test of the Autonomous Fibre-Optic Rotational Seismograph (AFORS), which utilizes the Sagnac effect for a direct measurement of the seismic-origin rotations of the ground. The main advantage of AFORS is its complete insensitivity to linear motions, as well as a direct measurement of rotational components emitted during seismic events. The presented system contains a special autonomous signal processing unit which optimizes its operation for the measurement of rotation motions, whereas the applied telemetric system based on the Internet allows for an AFORS remote control. The laboratory investigation of such two devices indicated that they keep an accuracy of no less than 5.1 × 10 −9 to 5.5 × 10 −8 rad/s in the detection frequency band from 0.83∼106.15 Hz and protect linear changes of sensitivity in the above bandpass. Some experimental results of an AFORS-1 application for a continuous monitoring of the rotational events in the Książ (Poland) seismological observatory are also presented.

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          Most cited references25

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          Sagnac Effect

          E. J. POST (1967)
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            Introduction to the Special Issue on Rotational Seismology and Engineering Applications

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              All-single-mode fiber-optic gyroscope with long-term stability.

              A new all-fiber gyroscope is described. All components are constructed directly on a single continuous optical fiber, removing localized sources of reflection. A laser-diode source is used to reduce coherent scattering effects. Proper choice of modulation frequency is shown to reduce instabilities further. Long-term stability at rest of better than 0.2 masculine/h is observed with 30-sec integration time.
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                Author and article information

                Journal
                Sensors (Basel)
                Sensors (Basel)
                Sensors (Basel, Switzerland)
                Molecular Diversity Preservation International (MDPI)
                1424-8220
                March 2014
                19 March 2014
                : 14
                : 3
                : 5459-5469
                Affiliations
                [1 ] Institute of Applied Physics, Military University of Technology, 2 Gen. Sylwestra Kaliskiego St., 00-908 Warsaw, Poland; E-Mails: akurzych@ 123456wat.edu.pl (A.K.); zkrajewski@ 123456wat.edu.pl (Z.K.)
                [2 ] Institute of Geophysics, Polish Academy of Sciences, 64 Księcia Janusza St., 01-452 Warsaw, Poland; E-Mail: kt@ 123456igf.edu.pl
                [3 ] m-Soft Ltd., 9-4 Sotta St., 02-790 Warsaw, Poland; E-Mail: jkk@ 123456m-soft.pl
                Author notes

                Author Contributions: Anna Kurzych has participated in the optical part construction and predominantly contributed to the figures and manuscript preparation; Leszek R. Jaroszewicz has planned the research, participated in data analysis, as well as in the discussion regarding final paper structure; Zbigniew Krajewski has participated in the AFORSs construction, made their calibration and investigation of accuracies as well as installed and carried out the measurements in Książ laboratory (Poland); Krzysztof P. Teisseyre has participated in the physical interpretation of the recorded seismological data in connection with seismological theories; Jerzy K. Kowalski has developed the conception and the functional operation for the Autonomous Signal Proceeding Units as well as prepared the FORS-Telemetric Server with all its functionalities.

                [* ]Author to whom correspondence should be addressed; E-Mail: jarosz@ 123456wat.edu.pl ; Tel.: +48-22-683-9014; Fax: +48-22-683-9317.
                Article
                sensors-14-05459
                10.3390/s140305459
                4004001
                24651723
                aa763730-1869-467f-88da-ac7ff2bb7916
                © 2014 by the authors; licensee MDPI, Basel, Switzerland.

                This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license ( http://creativecommons.org/licenses/by/3.0/).

                History
                : 30 December 2013
                : 07 February 2014
                : 07 March 2014
                Categories
                Article

                Biomedical engineering
                fibre optic sagnac interferometer,rotational seismic phenomena,continuously monitoring,remote control

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