Adaptation of the S-5-S Pendulím Seismometer for Measurement of Rotational Ground Motion

0382667 - ÚGN 2013 RIV NL eng J - Journal Article
Knejzlík, Jaromír - Kaláb, Zdeněk - Rambouský, Zdeněk
Adaptation of the S-5-S Pendulím Seismometer for Measurement of Rotational Ground Motion.
Journal of Seismology. Roč. 16, č. 4 (2012), s. 649-656. ISSN 1383-4649. E-ISSN 1573-157X
Institutional support: RVO:68145535
Keywords : rotational ground motion * experimental measurement * mining induced seismicity * S-5-S seismometer
Subject RIV: DC - Siesmology, Volcanology, Earth Structure
Impact factor: 1.388, year: 2012
http://link.springer.com/article/10.1007%2Fs10950-012-9279-6

The Russian electrodynamic seismometer model S-5-S has been adapted for the measurement of rotational ground motion. The mechanical system of the original S-5-S seismometer consists of electrodynamic sensing and damping transducer coils mounted on an asymmetrical double-arm pendulum. This pendulum is suspended on a footing using two pairs of crossed flat springs, which operate as the axis of rotation. The pendulum is stabilised by an additional spring. The S-5-S can be used either as a vertical or as a horizontal sensor. The adaptation of the S-5-S seismometer described below involves removal of the additional spring and installation of an additional mass on the damping arm. Strain gauge angle sensors are installed on one pair of the crossed flat springs. The main dynamic parameters of the rotational seismometer created in this way, i.e. the natural period and damping, are controlled electronically by feedback currents proportional to the angular displacement and angular velocity, both fed to the damping transducer coil.
Permanent Link: http://hdl.handle.net/11104/0212824