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Rotaphone-CY: The Newest Rotaphone Model Design and Preliminary Results from Performance Tests with Active Seismic Sources
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SYSNO ASEP 0543391 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Rotaphone-CY: The Newest Rotaphone Model Design and Preliminary Results from Performance Tests with Active Seismic Sources Author(s) Brokešová, J. (CZ)
Málek, Jiří (USMH-B) RID, ORCID, SAI
Vackář, Jiří (USMH-B) ORCID, RID
Bernauer, F. (DE)
Wassermann, J. (DE)
Igel, H. (DE)Number of authors 6 Article number 562 Source Title Sensors. - : MDPI
Roč. 21, č. 2 (2021)Number of pages 27 s. Publication form Online - E Language eng - English Country CH - Switzerland Keywords seismic rotation ; rotational seismometer ; Rotaphone ; seismic array ; rotation-to-translation relations ; field experiment Subject RIV JB - Sensors, Measurment, Regulation OECD category Environmental and geological engineering, geotechnics R&D Projects LTAUSA19083 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support USMH-B - RVO:67985891 UT WOS 000611722400001 EID SCOPUS 85099341388 DOI 10.3390/s21020562 Annotation Rotaphone-CY is a six-component short-period seismograph that is capable of the co-located recording of three translational (ground velocity) components along three orthogonal axes and three rotational (rotation rate) components around the three axes in one device. It is a mechanical sensor system utilizing records from elemental sensors (geophones) arranged in parallel pairs to derive differential motions in the pairs. The pairs are attached to a rigid frame that is anchored to the ground. The model design, the latest one among various Rotaphone designs based on the same principle and presented elsewhere, is briefly introduced. The upgrades of the new model are a 32-bit A/D converter, a more precise placing of the geophones to parallel pairs and a better housing, which protects the instrument from external electromagnetic noise. The instrument is still in a developmental stage. It was tested in a field experiment that took place at the Geophysical Observatory in Furstenfeldbruck (Germany) in November 2019. Four Rotaphones-CY underwent the huddle-testing phase of the experiment as well as the field-deployment phase, in which the instruments were installed in a small-aperture seismic array of a triangular shape. The preliminary results from this active-source experiment are shown. Rotaphone-CY data are verified, in part, by various approaches: mutual comparison of records from four independent Rotaphone-CY instruments, waveform matching according to rotation-to-translation relations, and comparison to array-derived rotations when applicable. The preliminary results are very promising and they suggest the good functionality of the Rotaphone-CY design. It has been proved that the present Rotaphone-CY model is a reliable instrument for measuring short-period seismic rotations of the amplitudes as small as 10-7 rad/s. Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2022 Electronic address https://www.mdpi.com/1424-8220/21/2/562
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