{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T04:27:09Z","timestamp":1760243229485,"version":"build-2065373602"},"reference-count":25,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2014,3,19]],"date-time":"2014-03-19T00:00:00Z","timestamp":1395187200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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 \u00d7 10\u22129 to 5.5 \u00d7 10\u22128 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 Ksi\u0105\u017c (Poland) seismological observatory are also presented.<\/jats:p>","DOI":"10.3390\/s140305459","type":"journal-article","created":{"date-parts":[[2014,3,19]],"date-time":"2014-03-19T13:33:16Z","timestamp":1395235996000},"page":"5459-5469","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Fibre Optic System for Monitoring Rotational  Seismic Phenomena"],"prefix":"10.3390","volume":"14","author":[{"given":"Anna","family":"Kurzych","sequence":"first","affiliation":[{"name":"Institute of Applied Physics, Military University of Technology, 2 Gen. Sylwestra Kaliskiego St., 00-908 Warsaw, Poland"}]},{"given":"Leszek","family":"Jaroszewicz","sequence":"additional","affiliation":[{"name":"Institute of Applied Physics, Military University of Technology, 2 Gen. Sylwestra Kaliskiego St., 00-908 Warsaw, Poland"}]},{"given":"Zbigniew","family":"Krajewski","sequence":"additional","affiliation":[{"name":"Institute of Applied Physics, Military University of Technology, 2 Gen. Sylwestra Kaliskiego St., 00-908 Warsaw, Poland"}]},{"given":"Krzysztof","family":"Teisseyre","sequence":"additional","affiliation":[{"name":"Institute of Geophysics, Polish Academy of Sciences, 64 Ksi\u0119cia Janusza St., 01-452 Warsaw, Poland"}]},{"given":"Jerzy","family":"Kowalski","sequence":"additional","affiliation":[{"name":"m-Soft Ltd., 9-4 Sotta St., 02-790 Warsaw, Poland"}]}],"member":"1968","published-online":{"date-parts":[[2014,3,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"945","DOI":"10.1785\/0120080344","article-title":"Introduction to the special issue on rotational seismology and engineering applications","volume":"99","author":"Lee","year":"2009","journal-title":"Bull. Seismol. Soc. 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