Digital Feedback Seismometer Study
Final rept. Oct 1973-Jul 1974
CHARLES STARK DRAPER LAB INC CAMBRIDGE MA
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Several methods are examined for obtaining digitized output data from the Geotech 36000 horizontal sensing seismometer in borehole installations. Configurations using either ternary or binary pulse width modulated torque-to- balance loops were found to be unsatisfactory. Analog-to-digital conversion of the output signal down-hole was found to be acceptable and a system using a digitizer within the seismometer feedback loop is recommended.
- Seismic Detection and Detectors