Abstract
We outline the research leading to development and application of the autonomous fibre-optic rotational seismograph (AFORS), which utilises the Sagnac effect for a direct measurement of rotation. The main advantage of AFORS comparing to other kinds of rotational seismometers is it completes 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 optimises its operation for the measurement of rotation motions, whereas a newly applied telemetric system based on the Internet allows for a remote AFORS control. The laboratory investigation of the two such devices indicated they keep accuracy no less than 5.1·10−9 to 5.5·10−8 rad/s in the frequency bandpass from 0.83 to 106.15 Hz. Moreover, they protect linear changes of sensitivity in above bandpass. The first experimental results of AFORS-1 operation in the Książ (Poland) seismological observatory are also presented and compared with data obtained from other types of rotational devices simultaneously used in this observatory.
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Acknowledgements
This work was done in the years 2009–2011 under the financial support of the Polish Ministry of Science and Higher Education under contract no. 2166/B/T02/2007/33 and partially (software for server) Key Project POIG.01.03.01-14-016/08 “New photonic materials and their advanced application”.
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Jaroszewicz, L.R., Krajewski, Z. & Teisseyre, K.P. Usefulness of AFORS—autonomous fibre-optic rotational seismograph for investigation of rotational phenomena. J Seismol 16, 573–586 (2012). https://doi.org/10.1007/s10950-011-9258-3
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DOI: https://doi.org/10.1007/s10950-011-9258-3