Post on 09-Mar-2016
description
Phone: (+34) 949290311 Fax: (+34) 949290063
Cerro de la Palera s/n 19141 - Yebes Guadalajara Spain
Phone: (+34) 949290311 Fax: (+34) 949290063 Email: jm.serna@oan.es
Gravimetry
The Center for Technological Developments (CDT) is a
branch of the National Geographic Institute of Spain. The
new Gravimetry Laboratory hosts some of the most
accurate state of the art gravimeters in the world.
Services Yebes Technological Development Center
Centro de Desarrollos Tecnológicos de Yebes
Instituto Geográfico Nacional (Spain)
Yebes Technological Development Center
Accuracy 2µGal
Precision 15µGal/sqrt(Hz)
Repeatability 1µGal
Operating Temp. Range +10º to +30ºC
Weight 320Kg
FG5 General Specifications
Power Requirements 500W
GWR-OSG General Specifications
Sensibility 1nGal
Accuracy (1 hour measurement) 5ngal
Frequency range O.1 Hz to Years
Drift < 6µgal/year
Accuracy 10µGal
Precision 100µGal/sqrt(Hz)
Repeatability 10µGal
Operating Temp. -20º to +35ºC
Weight 105Kg
A10 General Specifications
Power Requirements 300W
Gravimetry Applications
• Geophysical research: Detection of vertical crustal motion,
complementary verification of displacements measured with
GPS and VLBI, determination of the geoid, volcanic magma
flow monitoring, postglacial rebound studies, uplift of
subduction studies, Earthquake research, long period tidal
monitoring and modeling of earth anelasticity.
• Environmental: Water table monitoring in deep and / or
multiple aquifers, global sea level studies for global warming.
• Exploration and resource management: Oil and mineral
exploration.
• Inertial navigation: Gravity reference determinations,
relative gravity network control points, establishing geodetic
tie points for gravity networks, defining the geoid.
Gravimetry at the CDTGravimetry at the CDTGravimetry at the CDTGravimetry at the CDT Gravimetry Laboratory
Specially designed to host gravimeters. Given the delicacy of
these instruments and the high sensibility, it is necessary to have
control over the thermal behaviour of the building (double
chamber with air conditioning system in the external one) and the
structural behaviour (isolated concrete pillars).
FG5 Absolute Gravimeter
A freely falling reflective test mass is dropped in a vacuum cham-
ber. This causes optical fringes to be detected at the output of an
interferometer. This signal is used to determine the local gravita-
tional acceleration.
A10 Absolute Gravimeter
OSG GravityOSG GravityOSG GravityOSG Gravity
sensor unitsensor unitsensor unitsensor unit
Gravimetry laboratoryGravimetry laboratoryGravimetry laboratoryGravimetry laboratory
GWR-OSG Relative Gravimeter
In the SG sensor, levitation of a spherical test mass in an ultra-
stable magnetic field replaces the mechanical springs found in
previous relative gravity meters.
High precision continuous gravity monitoring for geophysical
phenomena such as normal modes, mantle rheology, tides, solid
Earth-oceans-atmosphere interactions, hydrology, and Earth
rotation.
Gravity Acquisition and Processing Software
“g” software“g” software“g” software“g” software
FG5 FG5 FG5 FG5
“UIPC” software“UIPC” software“UIPC” software“UIPC” software
The A-10 is an absolute gravimeter optimized for fast data
acquisition, ease of use, and portability in outdoor applications.
The instrument allows true field operation in harsh conditions on
open outdoor sites in the sun, snow, and wind.
FG5, A10 working principleFG5, A10 working principleFG5, A10 working principleFG5, A10 working principle
A10A10A10A10
FG5FG5FG5FG5
OSGOSGOSGOSG