Figure and Text in a Table of
width 600 pixelsImage is 360 x 464 pixels
| Figure and Text in a Table of
width 600 pixels Image is 360 x 464 pixels |
The superconducting gravimeter (SG) is the world's most sensitive and stable gravimeter. With a sensitivity of one nanogal, or one part in 1012 of surface gravity, precise measurements of earth tide parameters and the nearly diurnal free wobble of the earth can be made. This high sensitivity will enable the Global Geodynamics Project to search for internal gravity waves in the earth's liquid core and "slow or silent" earthquakes. The stability of the SG approaches a few m Gal per year which makes it invaluable for geodetic purposes, such as monitoring sea-level changes and tectonic deformations.
GWR Instruments, Inc. now manufactures the SG inside
of a compact 125 liter Dewar, which is 1 m high, 0.7 m in
diameter and weigh less than 100 Kg. Using 3 small granite
blocks, these Dewars can be mounted on any level concrete floor
in a 1 m x 1 m area. The Dewars' liquid helium hold-time is
longer than 2 years when operated with an efficient cryogenic
refrigerator, as shown in the photograph above.
The Compact Tidal SG's small size, easy installation, long hold-time, and simple maintenance make it ideal for operation at remote sites and in tunnels and mines. This extends its applications to monitoring gravity changes at existing seismic stations and volcano observatories. Other uses include high resolution gravity measurements at petroleum, geothermal and groundwater reservoirs.
| Figure and Text in a Table of width
360 pixels Image is 360 x 464 pixels
|
The superconducting gravimeter (SG) is the world's most sensitive and stable gravimeter. With a sensitivity of one nanogal, or one part in 1012 of surface gravity, precise measurements of earth tide parameters and the nearly diurnal free wobble of the earth can be made. This high sensitivity will enable the Global Geodynamics Project to search for internal gravity waves in the earth's liquid core and "slow or silent" earthquakes. The stability of the SG approaches a few m Gal per year which makes it invaluable for geodetic purposes, such as monitoring sea-level changes and tectonic deformations.
Figure and Text in a Table of width 360 pixels Image is 360 x 464 pixels |
GWR Instruments, Inc. now manufactures the SG inside of a compact 125 liter Dewar, which is 1 m high, 0.7 m in diameter and weigh less than 100 Kg. Using 3 small granite blocks, these Dewars can be mounted on any level concrete floor in a 1 m x 1 m area. The Dewars' liquid helium hold-time is longer than 2 years when operated with an efficient cryogenic refrigerator, as shown in the photograph above.
The Compact Tidal SG's small size, easy installation, long hold-time, and simple maintenance make it ideal for operation at remote sites and in tunnels and mines. This extends its applications to monitoring gravity changes at existing seismic stations and volcano observatories. Other uses include high resolution gravity measurements at petroleum, geothermal and groundwater reservoirs.