Publication Date:
2022-05-25
Description:
This report describes the new portable platform and gravity meter system
which has been assembled at the Woods Hole Oceanographic Institution. It
consists of three functionally distinct parts.
The first of these is a recently developed gyro-stabilized two-axis platform.
This platform has been designed to carry the vibrating string accelerometer
(VSA) and its associated oven assembly as the gravity sensor. The new
platform represents a major reduction in both size and weight over other
platforms suitable for gravity measurement. The second major part of this
system is a new gravity readout which interfaces with the VSA, processes the
VSA output, and prepares the resulting filtered acceleration data for output
to the acquisition system. The readout has been designed to allow flexible
use of the gravity system on a variety of vehicles, including ships, submarines
and aircraft. The third part of this new meter is the data acquisition
system. It consists of a microprocessor interfaced to a Kennedy 9-track tape
drive. Both the platform and the readout are connected to the microprocessor.
Results are presented from Endeavor cruise 88 that demonstrate the ability
of the platform to stabilize the gravity meter and for the gravity system to
produce raw data with a resolution of 48 milligals at a sampling rate of 10
Hz. Digital signal processing techniques which were used to filter the data
and extract the gravity signal with a resolution of 0.48 milligals are also
discussed.
Description:
Prepared for the Office of Naval Research under
Contract N00014-82-C-0019; NR 083-004.
Keywords:
Gravimeters
;
Signal processing
Repository Name:
Woods Hole Open Access Server
Type:
Technical Report
