Physics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pepi...18...35w&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 18, Issue 2, p. 35-37.
Physics
4
Scientific paper
The ``Willmore Mark II'' variable-period electromagnetic seismometer has now been replaced by the Mark III/IIIA seismometers, which give a similar range of period and similar voltage output from a smaller and lighter package. The new instruments also offer facilities for calibration, for damping, and for the control of period over a wide range by the injection of appropriate signals into auxiliary coils. The Mark IIIA seismometer has been further adapted by the addition of a displacement transducer system, which enables it to operate as a force-balance accelerometer. A new ``Mark IV'' instrument is the prototype of a package which will contain three ``sawn-off'' seismometers derived from the Mark III with the additional displacement transducer, all designed to fit into a cylindrical pressure case for use as a three-component borehole instrument. The paper includes a circuit for displaying four different outputs from a short-period seismometer, with options for displacement and acceleration feedback, as Lissajous figures against an input which simulates sinusoidal acceleration in the earth.
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