Accession Number : AD0748245

Title :   Seismometer Compensation for Acceleration Measurements,

Corporate Author : FRANK J SEILER RESEARCH LAB UNITED STATES AIR FORCE ACADEMY CO

Personal Author(s) : Lorenzini, Dino A. ; Schunk, Jack P.

Report Date : AUG 1972

Pagination or Media Count : 33

Abstract : The acceleration responses of two Hall-Sears 10 short period seismometers have been modified so that a flat output signal to input acceleration results between 0.1 Hz and 10 Hz. These instruments are to be used to actively control the pneumatically-supported isolation platform in the USAF Academy's Guidance and Control Laboratory. Descriptions of the notch filter compensation circuit and the transfer function measurement technique are given. The results obtained show that it is possible to keep the seismometer's acceleration response flat to plus or minus 2 db between 0.2 and 10 Hz by the appropriate selection of seismometer damping resistor and compensation circuit values. A simple gain adjustment procedure was used to match the compensated seismometer output magnitudes. (Author)

Descriptors :   *INERTIAL GUIDANCE, CORRECTIONS, SEISMOMETERS, STABILIZATION, TRANSFER FUNCTIONS, SYSTEMS ENGINEERING.

Subject Categories : Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE