Accession Number:

ADA003508

Title:

Digital Feedback Seismometer Study

Descriptive Note:

Final rept. Oct 1973-Jul 1974

Corporate Author:

CHARLES STARK DRAPER LAB INC CAMBRIDGE MA

Report Date:

1974-09-01

Pagination or Media Count:

71.0

Abstract:

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.

Subject Categories:

  • Seismology
  • Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE