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Sensors 2014, 14(3), 5459-5469; doi:10.3390/s140305459

Fibre Optic System for Monitoring Rotational Seismic Phenomena

1,* , 1
1 Institute of Applied Physics, Military University of Technology, 2 Gen. Sylwestra Kaliskiego St., 00-908 Warsaw, Poland 2 Institute of Geophysics, Polish Academy of Sciences, 64 Księcia Janusza St., 01-452 Warsaw, Poland 3 m-Soft Ltd., 9-4 Sotta St., 02-790 Warsaw, Poland
* Author to whom correspondence should be addressed.
Received: 30 December 2013 / Revised: 7 February 2014 / Accepted: 7 March 2014 / Published: 19 March 2014
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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.
Keywords: fibre optic Sagnac interferometer; rotational seismic phenomena; continuously monitoring; remote control fibre optic Sagnac interferometer; rotational seismic phenomena; continuously monitoring; remote control
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Kurzych, A.; Jaroszewicz, L.R.; Krajewski, Z.; Teisseyre, K.P.; Kowalski, J.K. Fibre Optic System for Monitoring Rotational Seismic Phenomena. Sensors 2014, 14, 5459-5469.

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