Wide-band feedback seismometers

Details Wide-band feedback seismometers Wide-band feedback seismometers

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pepi...18...38u&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 18, Issue 2, p. 38-50.

Physics

9

Scientific paper

The effects of feedback in seismometers are summarised and the responsivities and detectivities of various open-and closed-loop instruments are compared and discussed. It is concluded that the most satisfactory system is displacement force-feedback employing a capacitive displacement transducer. Details are given of a Willmore Mk III(a) short-period seismometer which has been converted to a wide-band force-feedback instrument by the addition of a capacitive transducer. It provides a wide-band response flat to acceleration from d.c. to 25 Hz, with a theoretical detection level of 10-10 m s-2 Hz-1/2 and a dynamic range of 140 dB. Wide-band velocity, long-period narrow-band or short-period responses are easily obtained by filters outside the loop. The instrument has been compared with standard seismometers over a period of several months, and found to compare satisfactorily when enclosed in a small pressure vessel.

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